mirror of https://git.ffmpeg.org/ffmpeg.git
2323 lines
78 KiB
C
2323 lines
78 KiB
C
/*
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* MPEG1 codec / MPEG2 decoder
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* Copyright (c) 2000,2001 Fabrice Bellard.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* @file mpeg12.c
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* MPEG1 codec / MPEG2 decoder.
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*/
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//#define DEBUG
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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#include "mpeg12data.h"
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/* Start codes. */
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#define SEQ_END_CODE 0x000001b7
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#define SEQ_START_CODE 0x000001b3
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#define GOP_START_CODE 0x000001b8
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#define PICTURE_START_CODE 0x00000100
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#define SLICE_MIN_START_CODE 0x00000101
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#define SLICE_MAX_START_CODE 0x000001af
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#define EXT_START_CODE 0x000001b5
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#define USER_START_CODE 0x000001b2
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#define DC_VLC_BITS 9
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#define MV_VLC_BITS 9
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#define MBINCR_VLC_BITS 9
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#define MB_PAT_VLC_BITS 9
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#define MB_PTYPE_VLC_BITS 6
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#define MB_BTYPE_VLC_BITS 6
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#define TEX_VLC_BITS 9
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static void mpeg1_encode_block(MpegEncContext *s,
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DCTELEM *block,
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int component);
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static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code); // RAL: f_code parameter added
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static void mpeg1_skip_picture(MpegEncContext *s, int pict_num);
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static inline int mpeg1_decode_block_inter(MpegEncContext *s,
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DCTELEM *block,
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int n);
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static inline int mpeg1_decode_block_intra(MpegEncContext *s,
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DCTELEM *block,
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int n);
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static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
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DCTELEM *block,
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int n);
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static inline int mpeg2_decode_block_intra(MpegEncContext *s,
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DCTELEM *block,
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int n);
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static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
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#ifdef CONFIG_ENCODERS
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static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL;
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static uint8_t fcode_tab[MAX_MV*2+1];
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static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2];
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static uint8_t uni_mpeg1_ac_vlc_len [64*64*2];
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#endif
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static void init_2d_vlc_rl(RLTable *rl)
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{
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int i;
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init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2,
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&rl->table_vlc[0][1], 4, 2,
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&rl->table_vlc[0][0], 4, 2);
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rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM));
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for(i=0; i<rl->vlc.table_size; i++){
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int code= rl->vlc.table[i][0];
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int len = rl->vlc.table[i][1];
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int level, run;
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if(len==0){ // illegal code
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run= 65;
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level= MAX_LEVEL;
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}else if(len<0){ //more bits needed
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run= 0;
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level= code;
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}else{
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if(code==rl->n){ //esc
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run= 65;
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level= 0;
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}else if(code==rl->n+1){ //eob
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run= 0;
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level= 127;
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}else{
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run= rl->table_run [code] + 1;
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level= rl->table_level[code];
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}
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}
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rl->rl_vlc[0][i].len= len;
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rl->rl_vlc[0][i].level= level;
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rl->rl_vlc[0][i].run= run;
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}
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}
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static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){
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int i;
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for(i=0; i<128; i++){
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int level= i-64;
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int run;
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for(run=0; run<64; run++){
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int len, bits, code;
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int alevel= ABS(level);
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int sign= (level>>31)&1;
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if (alevel > rl->max_level[0][run])
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code= 111; /*rl->n*/
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else
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code= rl->index_run[0][run] + alevel - 1;
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if (code < 111 /* rl->n */) {
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/* store the vlc & sign at once */
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len= mpeg1_vlc[code][1]+1;
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bits= (mpeg1_vlc[code][0]<<1) + sign;
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} else {
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len= mpeg1_vlc[111/*rl->n*/][1]+6;
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bits= mpeg1_vlc[111/*rl->n*/][0]<<6;
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bits|= run;
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if (alevel < 128) {
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bits<<=8; len+=8;
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bits|= level & 0xff;
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} else {
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bits<<=16; len+=16;
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bits|= level & 0xff;
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if (level < 0) {
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bits|= 0x8001 + level + 255;
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} else {
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bits|= level & 0xffff;
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}
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}
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}
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uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits;
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uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
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}
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}
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}
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static void put_header(MpegEncContext *s, int header)
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{
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align_put_bits(&s->pb);
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put_bits(&s->pb, 16, header>>16);
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put_bits(&s->pb, 16, header&0xFFFF);
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}
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/* put sequence header if needed */
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static void mpeg1_encode_sequence_header(MpegEncContext *s)
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{
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unsigned int vbv_buffer_size;
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unsigned int fps, v;
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int n, i;
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uint64_t time_code;
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float best_aspect_error= 1E10;
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float aspect_ratio= s->avctx->aspect_ratio;
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if(aspect_ratio==0.0) aspect_ratio= s->width / (float)s->height; //pixel aspect 1:1 (VGA)
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if (s->current_picture.key_frame) {
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/* mpeg1 header repeated every gop */
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put_header(s, SEQ_START_CODE);
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/* search closest frame rate */
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{
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int i, dmin, d;
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s->frame_rate_index = 0;
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dmin = 0x7fffffff;
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for(i=1;i<14;i++) {
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if(s->avctx->strict_std_compliance >= 0 && i>=9) break;
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d = abs(MPEG1_FRAME_RATE_BASE*(int64_t)s->avctx->frame_rate/s->avctx->frame_rate_base - frame_rate_tab[i]);
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if (d < dmin) {
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dmin = d;
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s->frame_rate_index = i;
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}
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}
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}
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put_bits(&s->pb, 12, s->width);
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put_bits(&s->pb, 12, s->height);
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for(i=1; i<15; i++){
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float error= mpeg1_aspect[i] - s->width/(s->height*aspect_ratio);
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error= ABS(error);
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if(error < best_aspect_error){
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best_aspect_error= error;
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s->aspect_ratio_info= i;
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}
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}
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put_bits(&s->pb, 4, s->aspect_ratio_info);
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put_bits(&s->pb, 4, s->frame_rate_index);
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v = (s->bit_rate + 399) / 400;
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if (v > 0x3ffff)
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v = 0x3ffff;
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put_bits(&s->pb, 18, v);
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put_bits(&s->pb, 1, 1); /* marker */
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if(s->avctx->rc_buffer_size)
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vbv_buffer_size = s->avctx->rc_buffer_size;
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else
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/* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */
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vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024;
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put_bits(&s->pb, 10, (vbv_buffer_size + 16383) / 16384);
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put_bits(&s->pb, 1, 1); /* constrained parameter flag */
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put_bits(&s->pb, 1, 0); /* no custom intra matrix */
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put_bits(&s->pb, 1, 0); /* no custom non intra matrix */
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put_header(s, GOP_START_CODE);
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put_bits(&s->pb, 1, 0); /* do drop frame */
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/* time code : we must convert from the real frame rate to a
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fake mpeg frame rate in case of low frame rate */
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fps = frame_rate_tab[s->frame_rate_index];
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time_code = (int64_t)s->fake_picture_number * MPEG1_FRAME_RATE_BASE;
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s->gop_picture_number = s->fake_picture_number;
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put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24));
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put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60));
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put_bits(&s->pb, 1, 1);
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put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60));
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put_bits(&s->pb, 6, (uint32_t)((time_code % fps) / MPEG1_FRAME_RATE_BASE));
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put_bits(&s->pb, 1, 1); /* closed gop */
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put_bits(&s->pb, 1, 0); /* broken link */
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}
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if (s->avctx->frame_rate < (24 * s->avctx->frame_rate_base) && s->picture_number > 0) {
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/* insert empty P pictures to slow down to the desired
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frame rate. Each fake pictures takes about 20 bytes */
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fps = frame_rate_tab[s->frame_rate_index];
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n = av_rescale((int64_t)s->picture_number * s->avctx->frame_rate_base, fps, s->avctx->frame_rate) / MPEG1_FRAME_RATE_BASE - 1;
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while (s->fake_picture_number < n) {
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mpeg1_skip_picture(s, s->fake_picture_number -
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s->gop_picture_number);
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s->fake_picture_number++;
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}
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}
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}
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static inline void encode_mb_skip_run(MpegEncContext *s, int run){
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while (run >= 33) {
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put_bits(&s->pb, 11, 0x008);
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run -= 33;
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}
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put_bits(&s->pb, mbAddrIncrTable[run][1],
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mbAddrIncrTable[run][0]);
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}
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/* insert a fake P picture */
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static void mpeg1_skip_picture(MpegEncContext *s, int pict_num)
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{
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/* mpeg1 picture header */
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put_header(s, PICTURE_START_CODE);
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/* temporal reference */
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put_bits(&s->pb, 10, pict_num & 0x3ff);
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put_bits(&s->pb, 3, P_TYPE);
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put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
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put_bits(&s->pb, 1, 1); /* integer coordinates */
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put_bits(&s->pb, 3, 1); /* forward_f_code */
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put_bits(&s->pb, 1, 0); /* extra bit picture */
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/* only one slice */
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put_header(s, SLICE_MIN_START_CODE);
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put_bits(&s->pb, 5, 1); /* quantizer scale */
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put_bits(&s->pb, 1, 0); /* slice extra information */
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encode_mb_skip_run(s, 0);
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/* empty macroblock */
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put_bits(&s->pb, 3, 1); /* motion only */
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/* zero motion x & y */
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put_bits(&s->pb, 1, 1);
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put_bits(&s->pb, 1, 1);
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/* output a number of empty slice */
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encode_mb_skip_run(s, s->mb_width * s->mb_height - 2);
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/* empty macroblock */
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put_bits(&s->pb, 3, 1); /* motion only */
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/* zero motion x & y */
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put_bits(&s->pb, 1, 1);
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put_bits(&s->pb, 1, 1);
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}
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static void common_init(MpegEncContext *s)
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{
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s->y_dc_scale_table=
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s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
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}
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#ifdef CONFIG_ENCODERS
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void ff_mpeg1_encode_slice_header(MpegEncContext *s){
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put_header(s, SLICE_MIN_START_CODE + s->mb_y);
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put_bits(&s->pb, 5, s->qscale); /* quantizer scale */
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put_bits(&s->pb, 1, 0); /* slice extra information */
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}
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void ff_mpeg1_clean_buffers(MpegEncContext *s){
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s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
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s->last_dc[1] = s->last_dc[0];
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s->last_dc[2] = s->last_dc[0];
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memset(s->last_mv, 0, sizeof(s->last_mv));
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}
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void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
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{
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mpeg1_encode_sequence_header(s);
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/* mpeg1 picture header */
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put_header(s, PICTURE_START_CODE);
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/* temporal reference */
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// RAL: s->picture_number instead of s->fake_picture_number
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put_bits(&s->pb, 10, (s->picture_number -
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s->gop_picture_number) & 0x3ff);
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s->fake_picture_number++;
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put_bits(&s->pb, 3, s->pict_type);
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put_bits(&s->pb, 16, 0xffff); /* non constant bit rate */
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// RAL: Forward f_code also needed for B frames
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if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
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put_bits(&s->pb, 1, 0); /* half pel coordinates */
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put_bits(&s->pb, 3, s->f_code); /* forward_f_code */
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}
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// RAL: Backward f_code necessary for B frames
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if (s->pict_type == B_TYPE) {
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put_bits(&s->pb, 1, 0); /* half pel coordinates */
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put_bits(&s->pb, 3, s->b_code); /* backward_f_code */
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}
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put_bits(&s->pb, 1, 0); /* extra bit picture */
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s->mb_y=0;
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ff_mpeg1_encode_slice_header(s);
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}
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void mpeg1_encode_mb(MpegEncContext *s,
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DCTELEM block[6][64],
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int motion_x, int motion_y)
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{
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int i, cbp;
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const int mb_x = s->mb_x;
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const int mb_y = s->mb_y;
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const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y;
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/* compute cbp */
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cbp = 0;
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for(i=0;i<6;i++) {
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if (s->block_last_index[i] >= 0)
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cbp |= 1 << (5 - i);
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}
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if (cbp == 0 && !first_mb && (mb_x != s->mb_width - 1 || mb_y != s->mb_height - 1) &&
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((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) ||
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(s->pict_type == B_TYPE && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) |
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((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) {
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s->mb_skip_run++;
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s->qscale -= s->dquant;
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s->skip_count++;
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s->misc_bits++;
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s->last_bits++;
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} else {
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if(first_mb){
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assert(s->mb_skip_run == 0);
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encode_mb_skip_run(s, s->mb_x);
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}else{
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encode_mb_skip_run(s, s->mb_skip_run);
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}
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if (s->pict_type == I_TYPE) {
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if(s->dquant && cbp){
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put_bits(&s->pb, 2, 1); /* macroblock_type : macroblock_quant = 1 */
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put_bits(&s->pb, 5, s->qscale);
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}else{
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put_bits(&s->pb, 1, 1); /* macroblock_type : macroblock_quant = 0 */
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s->qscale -= s->dquant;
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}
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s->misc_bits+= get_bits_diff(s);
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s->i_count++;
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} else if (s->mb_intra) {
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if(s->dquant && cbp){
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put_bits(&s->pb, 6, 0x01);
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put_bits(&s->pb, 5, s->qscale);
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}else{
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put_bits(&s->pb, 5, 0x03);
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s->qscale -= s->dquant;
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}
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s->misc_bits+= get_bits_diff(s);
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s->i_count++;
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s->last_mv[0][0][0] =
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s->last_mv[0][0][1] = 0;
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} else if (s->pict_type == P_TYPE) {
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if (cbp != 0) {
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if (motion_x == 0 && motion_y == 0) {
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if(s->dquant){
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put_bits(&s->pb, 5, 1); /* macroblock_pattern & quant */
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put_bits(&s->pb, 5, s->qscale);
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}else{
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put_bits(&s->pb, 2, 1); /* macroblock_pattern only */
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}
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s->misc_bits+= get_bits_diff(s);
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put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
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} else {
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if(s->dquant){
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put_bits(&s->pb, 5, 2); /* motion + cbp */
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put_bits(&s->pb, 5, s->qscale);
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}else{
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put_bits(&s->pb, 1, 1); /* motion + cbp */
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}
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s->misc_bits+= get_bits_diff(s);
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mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
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mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
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s->mv_bits+= get_bits_diff(s);
|
|
put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
|
|
}
|
|
} else {
|
|
put_bits(&s->pb, 3, 1); /* motion only */
|
|
mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added
|
|
mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added
|
|
s->qscale -= s->dquant;
|
|
s->mv_bits+= get_bits_diff(s);
|
|
}
|
|
s->f_count++;
|
|
} else
|
|
{ // RAL: All the following bloc added for B frames:
|
|
if (cbp != 0)
|
|
{ // With coded bloc pattern
|
|
if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
|
|
{ // Bi-directional motion
|
|
if (s->dquant)
|
|
{ // With QScale
|
|
put_bits(&s->pb, 5, 2);
|
|
put_bits(&s->pb, 5, s->qscale);
|
|
}
|
|
else // Without QScale
|
|
put_bits(&s->pb, 2, 3);
|
|
s->misc_bits += get_bits_diff(s);
|
|
mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
|
|
mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
|
|
mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
|
|
mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
|
|
s->b_count++;
|
|
s->f_count++;
|
|
s->mv_bits += get_bits_diff(s);
|
|
put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
|
|
}
|
|
else if (s->mv_dir == MV_DIR_BACKWARD)
|
|
{ // Backward motion
|
|
if (s->dquant)
|
|
{ // With QScale
|
|
put_bits(&s->pb, 6, 2);
|
|
put_bits(&s->pb, 5, s->qscale);
|
|
}
|
|
else // Without QScale
|
|
put_bits(&s->pb, 3, 3);
|
|
s->misc_bits += get_bits_diff(s);
|
|
mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
|
|
mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
|
|
s->b_count++;
|
|
s->mv_bits += get_bits_diff(s);
|
|
put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
|
|
}
|
|
else if (s->mv_dir == MV_DIR_FORWARD)
|
|
{ // Forward motion
|
|
if (s->dquant)
|
|
{ // With QScale
|
|
put_bits(&s->pb, 6, 3);
|
|
put_bits(&s->pb, 5, s->qscale);
|
|
}
|
|
else // Without QScale
|
|
put_bits(&s->pb, 4, 3);
|
|
s->misc_bits += get_bits_diff(s);
|
|
mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
|
|
mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
|
|
s->f_count++;
|
|
s->mv_bits += get_bits_diff(s);
|
|
put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
|
|
}
|
|
}
|
|
else
|
|
{ // No coded bloc pattern
|
|
if (s->mv_dir == (MV_DIR_FORWARD | MV_DIR_BACKWARD))
|
|
{ // Bi-directional motion
|
|
put_bits(&s->pb, 2, 2); /* backward & forward motion */
|
|
mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
|
|
mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
|
|
mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
|
|
mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
|
|
s->b_count++;
|
|
s->f_count++;
|
|
}
|
|
else if (s->mv_dir == MV_DIR_BACKWARD)
|
|
{ // Backward motion
|
|
put_bits(&s->pb, 3, 2); /* backward motion only */
|
|
mpeg1_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
|
|
mpeg1_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
|
|
s->b_count++;
|
|
}
|
|
else if (s->mv_dir == MV_DIR_FORWARD)
|
|
{ // Forward motion
|
|
put_bits(&s->pb, 4, 2); /* forward motion only */
|
|
mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
|
|
mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
|
|
s->f_count++;
|
|
}
|
|
s->qscale -= s->dquant;
|
|
s->mv_bits += get_bits_diff(s);
|
|
}
|
|
// End of bloc from RAL
|
|
}
|
|
for(i=0;i<6;i++) {
|
|
if (cbp & (1 << (5 - i))) {
|
|
mpeg1_encode_block(s, block[i], i);
|
|
}
|
|
}
|
|
s->mb_skip_run = 0;
|
|
if(s->mb_intra)
|
|
s->i_tex_bits+= get_bits_diff(s);
|
|
else
|
|
s->p_tex_bits+= get_bits_diff(s);
|
|
}
|
|
|
|
// RAL: By this:
|
|
if (s->mv_dir & MV_DIR_FORWARD)
|
|
{
|
|
s->last_mv[0][0][0]= s->mv[0][0][0];
|
|
s->last_mv[0][0][1]= s->mv[0][0][1];
|
|
}
|
|
if (s->mv_dir & MV_DIR_BACKWARD)
|
|
{
|
|
s->last_mv[1][0][0]= s->mv[1][0][0];
|
|
s->last_mv[1][0][1]= s->mv[1][0][1];
|
|
}
|
|
}
|
|
|
|
// RAL: Parameter added: f_or_b_code
|
|
static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code)
|
|
{
|
|
int code, bit_size, l, m, bits, range, sign;
|
|
|
|
if (val == 0) {
|
|
/* zero vector */
|
|
code = 0;
|
|
put_bits(&s->pb,
|
|
mbMotionVectorTable[0][1],
|
|
mbMotionVectorTable[0][0]);
|
|
} else {
|
|
bit_size = f_or_b_code - 1;
|
|
range = 1 << bit_size;
|
|
/* modulo encoding */
|
|
l = 16 * range;
|
|
m = 2 * l;
|
|
if (val < -l) {
|
|
val += m;
|
|
} else if (val >= l) {
|
|
val -= m;
|
|
}
|
|
|
|
if (val >= 0) {
|
|
val--;
|
|
code = (val >> bit_size) + 1;
|
|
bits = val & (range - 1);
|
|
sign = 0;
|
|
} else {
|
|
val = -val;
|
|
val--;
|
|
code = (val >> bit_size) + 1;
|
|
bits = val & (range - 1);
|
|
sign = 1;
|
|
}
|
|
|
|
assert(code > 0 && code <= 16);
|
|
|
|
put_bits(&s->pb,
|
|
mbMotionVectorTable[code][1],
|
|
mbMotionVectorTable[code][0]);
|
|
|
|
put_bits(&s->pb, 1, sign);
|
|
if (bit_size > 0) {
|
|
put_bits(&s->pb, bit_size, bits);
|
|
}
|
|
}
|
|
}
|
|
|
|
void ff_mpeg1_encode_init(MpegEncContext *s)
|
|
{
|
|
static int done=0;
|
|
|
|
common_init(s);
|
|
|
|
if(!done){
|
|
int f_code;
|
|
int mv;
|
|
int i;
|
|
|
|
done=1;
|
|
init_rl(&rl_mpeg1);
|
|
|
|
for(i=0; i<64; i++)
|
|
{
|
|
mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
|
|
mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
|
|
}
|
|
|
|
init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len);
|
|
|
|
/* build unified dc encoding tables */
|
|
for(i=-255; i<256; i++)
|
|
{
|
|
int adiff, index;
|
|
int bits, code;
|
|
int diff=i;
|
|
|
|
adiff = ABS(diff);
|
|
if(diff<0) diff--;
|
|
index = vlc_dc_table[adiff];
|
|
|
|
bits= vlc_dc_lum_bits[index] + index;
|
|
code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
|
|
mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
|
|
|
|
bits= vlc_dc_chroma_bits[index] + index;
|
|
code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
|
|
mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
|
|
}
|
|
|
|
mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) );
|
|
|
|
for(f_code=1; f_code<=MAX_FCODE; f_code++){
|
|
for(mv=-MAX_MV; mv<=MAX_MV; mv++){
|
|
int len;
|
|
|
|
if(mv==0) len= mbMotionVectorTable[0][1];
|
|
else{
|
|
int val, bit_size, range, code;
|
|
|
|
bit_size = s->f_code - 1;
|
|
range = 1 << bit_size;
|
|
|
|
val=mv;
|
|
if (val < 0)
|
|
val = -val;
|
|
val--;
|
|
code = (val >> bit_size) + 1;
|
|
if(code<17){
|
|
len= mbMotionVectorTable[code][1] + 1 + bit_size;
|
|
}else{
|
|
len= mbMotionVectorTable[16][1] + 2 + bit_size;
|
|
}
|
|
}
|
|
|
|
mv_penalty[f_code][mv+MAX_MV]= len;
|
|
}
|
|
}
|
|
|
|
|
|
for(f_code=MAX_FCODE; f_code>0; f_code--){
|
|
for(mv=-(8<<f_code); mv<(8<<f_code); mv++){
|
|
fcode_tab[mv+MAX_MV]= f_code;
|
|
}
|
|
}
|
|
}
|
|
s->me.mv_penalty= mv_penalty;
|
|
s->fcode_tab= fcode_tab;
|
|
s->min_qcoeff=-255;
|
|
s->max_qcoeff= 255;
|
|
s->intra_ac_vlc_length=
|
|
s->inter_ac_vlc_length= uni_mpeg1_ac_vlc_len;
|
|
}
|
|
|
|
static inline void encode_dc(MpegEncContext *s, int diff, int component)
|
|
{
|
|
if (component == 0) {
|
|
put_bits(
|
|
&s->pb,
|
|
mpeg1_lum_dc_uni[diff+255]&0xFF,
|
|
mpeg1_lum_dc_uni[diff+255]>>8);
|
|
} else {
|
|
put_bits(
|
|
&s->pb,
|
|
mpeg1_chr_dc_uni[diff+255]&0xFF,
|
|
mpeg1_chr_dc_uni[diff+255]>>8);
|
|
}
|
|
}
|
|
|
|
static void mpeg1_encode_block(MpegEncContext *s,
|
|
DCTELEM *block,
|
|
int n)
|
|
{
|
|
int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign;
|
|
int code, component;
|
|
// RLTable *rl = &rl_mpeg1;
|
|
|
|
last_index = s->block_last_index[n];
|
|
|
|
/* DC coef */
|
|
if (s->mb_intra) {
|
|
component = (n <= 3 ? 0 : n - 4 + 1);
|
|
dc = block[0]; /* overflow is impossible */
|
|
diff = dc - s->last_dc[component];
|
|
encode_dc(s, diff, component);
|
|
s->last_dc[component] = dc;
|
|
i = 1;
|
|
} else {
|
|
/* encode the first coefficient : needs to be done here because
|
|
it is handled slightly differently */
|
|
level = block[0];
|
|
if (abs(level) == 1) {
|
|
code = ((uint32_t)level >> 31); /* the sign bit */
|
|
put_bits(&s->pb, 2, code | 0x02);
|
|
i = 1;
|
|
} else {
|
|
i = 0;
|
|
last_non_zero = -1;
|
|
goto next_coef;
|
|
}
|
|
}
|
|
|
|
/* now quantify & encode AC coefs */
|
|
last_non_zero = i - 1;
|
|
|
|
for(;i<=last_index;i++) {
|
|
j = s->intra_scantable.permutated[i];
|
|
level = block[j];
|
|
next_coef:
|
|
#if 0
|
|
if (level != 0)
|
|
dprintf("level[%d]=%d\n", i, level);
|
|
#endif
|
|
/* encode using VLC */
|
|
if (level != 0) {
|
|
run = i - last_non_zero - 1;
|
|
|
|
alevel= level;
|
|
MASK_ABS(sign, alevel)
|
|
sign&=1;
|
|
|
|
// code = get_rl_index(rl, 0, run, alevel);
|
|
if (alevel <= mpeg1_max_level[0][run]){
|
|
code= mpeg1_index_run[0][run] + alevel - 1;
|
|
/* store the vlc & sign at once */
|
|
put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
|
|
} else {
|
|
/* escape seems to be pretty rare <5% so i dont optimize it */
|
|
put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]);
|
|
/* escape: only clip in this case */
|
|
put_bits(&s->pb, 6, run);
|
|
if (alevel < 128) {
|
|
put_bits(&s->pb, 8, level & 0xff);
|
|
} else {
|
|
if (level < 0) {
|
|
put_bits(&s->pb, 16, 0x8001 + level + 255);
|
|
} else {
|
|
put_bits(&s->pb, 16, level & 0xffff);
|
|
}
|
|
}
|
|
}
|
|
last_non_zero = i;
|
|
}
|
|
}
|
|
/* end of block */
|
|
put_bits(&s->pb, 2, 0x2);
|
|
}
|
|
#endif //CONFIG_ENCODERS
|
|
|
|
/******************************************/
|
|
/* decoding */
|
|
|
|
static VLC dc_lum_vlc;
|
|
static VLC dc_chroma_vlc;
|
|
static VLC mv_vlc;
|
|
static VLC mbincr_vlc;
|
|
static VLC mb_ptype_vlc;
|
|
static VLC mb_btype_vlc;
|
|
static VLC mb_pat_vlc;
|
|
|
|
static void init_vlcs(MpegEncContext *s)
|
|
{
|
|
static int done = 0;
|
|
|
|
if (!done) {
|
|
done = 1;
|
|
|
|
init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12,
|
|
vlc_dc_lum_bits, 1, 1,
|
|
vlc_dc_lum_code, 2, 2);
|
|
init_vlc(&dc_chroma_vlc, DC_VLC_BITS, 12,
|
|
vlc_dc_chroma_bits, 1, 1,
|
|
vlc_dc_chroma_code, 2, 2);
|
|
init_vlc(&mv_vlc, MV_VLC_BITS, 17,
|
|
&mbMotionVectorTable[0][1], 2, 1,
|
|
&mbMotionVectorTable[0][0], 2, 1);
|
|
init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36,
|
|
&mbAddrIncrTable[0][1], 2, 1,
|
|
&mbAddrIncrTable[0][0], 2, 1);
|
|
init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63,
|
|
&mbPatTable[0][1], 2, 1,
|
|
&mbPatTable[0][0], 2, 1);
|
|
|
|
init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
|
|
&table_mb_ptype[0][1], 2, 1,
|
|
&table_mb_ptype[0][0], 2, 1);
|
|
init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
|
|
&table_mb_btype[0][1], 2, 1,
|
|
&table_mb_btype[0][0], 2, 1);
|
|
init_rl(&rl_mpeg1);
|
|
init_rl(&rl_mpeg2);
|
|
|
|
init_2d_vlc_rl(&rl_mpeg1);
|
|
init_2d_vlc_rl(&rl_mpeg2);
|
|
}
|
|
}
|
|
|
|
static inline int get_dmv(MpegEncContext *s)
|
|
{
|
|
if(get_bits1(&s->gb))
|
|
return 1 - (get_bits1(&s->gb) << 1);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static inline int get_qscale(MpegEncContext *s)
|
|
{
|
|
int qscale;
|
|
if (s->mpeg2) {
|
|
if (s->q_scale_type) {
|
|
qscale = non_linear_qscale[get_bits(&s->gb, 5)];
|
|
} else {
|
|
qscale = get_bits(&s->gb, 5) << 1;
|
|
}
|
|
} else {
|
|
/* for mpeg1, we use the generic unquant code */
|
|
qscale = get_bits(&s->gb, 5);
|
|
}
|
|
return qscale;
|
|
}
|
|
|
|
/* motion type (for mpeg2) */
|
|
#define MT_FIELD 1
|
|
#define MT_FRAME 2
|
|
#define MT_16X8 2
|
|
#define MT_DMV 3
|
|
|
|
static int mpeg_decode_mb(MpegEncContext *s,
|
|
DCTELEM block[6][64])
|
|
{
|
|
int i, j, k, cbp, val, mb_type, motion_type;
|
|
|
|
dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
|
|
|
|
assert(s->mb_skiped==0);
|
|
|
|
if (s->mb_skip_run-- != 0) {
|
|
if(s->pict_type == I_TYPE){
|
|
fprintf(stderr, "skiped MB in I frame at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
/* skip mb */
|
|
s->mb_intra = 0;
|
|
for(i=0;i<6;i++)
|
|
s->block_last_index[i] = -1;
|
|
s->mv_type = MV_TYPE_16X16;
|
|
if (s->pict_type == P_TYPE) {
|
|
/* if P type, zero motion vector is implied */
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
s->mv[0][0][0] = s->mv[0][0][1] = 0;
|
|
s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
|
|
s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
|
|
s->mb_skiped = 1;
|
|
s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
|
|
} else {
|
|
/* if B type, reuse previous vectors and directions */
|
|
s->mv[0][0][0] = s->last_mv[0][0][0];
|
|
s->mv[0][0][1] = s->last_mv[0][0][1];
|
|
s->mv[1][0][0] = s->last_mv[1][0][0];
|
|
s->mv[1][0][1] = s->last_mv[1][0][1];
|
|
|
|
s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]=
|
|
s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1] | MB_TYPE_SKIP;
|
|
// assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8));
|
|
|
|
if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0)
|
|
s->mb_skiped = 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
switch(s->pict_type) {
|
|
default:
|
|
case I_TYPE:
|
|
if (get_bits1(&s->gb) == 0) {
|
|
if (get_bits1(&s->gb) == 0)
|
|
return -1;
|
|
mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
|
|
} else {
|
|
mb_type = MB_TYPE_INTRA;
|
|
}
|
|
break;
|
|
case P_TYPE:
|
|
mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
|
|
if (mb_type < 0){
|
|
fprintf(stderr, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
mb_type = ptype2mb_type[ mb_type ];
|
|
break;
|
|
case B_TYPE:
|
|
mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
|
|
if (mb_type < 0){
|
|
fprintf(stderr, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
mb_type = btype2mb_type[ mb_type ];
|
|
break;
|
|
}
|
|
dprintf("mb_type=%x\n", mb_type);
|
|
// motion_type = 0; /* avoid warning */
|
|
if (IS_INTRA(mb_type)) {
|
|
/* compute dct type */
|
|
if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
|
|
!s->frame_pred_frame_dct) {
|
|
s->interlaced_dct = get_bits1(&s->gb);
|
|
}
|
|
|
|
if (IS_QUANT(mb_type))
|
|
s->qscale = get_qscale(s);
|
|
|
|
if (s->concealment_motion_vectors) {
|
|
/* just parse them */
|
|
if (s->picture_structure != PICT_FRAME)
|
|
skip_bits1(&s->gb); /* field select */
|
|
mpeg_decode_motion(s, s->mpeg_f_code[0][0], 0);
|
|
mpeg_decode_motion(s, s->mpeg_f_code[0][1], 0);
|
|
skip_bits1(&s->gb); /* marker */
|
|
}
|
|
s->mb_intra = 1;
|
|
memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
|
|
|
|
if (s->mpeg2) {
|
|
for(i=0;i<6;i++) {
|
|
if (mpeg2_decode_block_intra(s, block[i], i) < 0)
|
|
return -1;
|
|
}
|
|
} else {
|
|
for(i=0;i<6;i++) {
|
|
if (mpeg1_decode_block_intra(s, block[i], i) < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
} else {
|
|
if (mb_type & MB_TYPE_ZERO_MV){
|
|
assert(mb_type & MB_TYPE_PAT);
|
|
|
|
/* compute dct type */
|
|
if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
|
|
!s->frame_pred_frame_dct) {
|
|
s->interlaced_dct = get_bits1(&s->gb);
|
|
}
|
|
|
|
if (IS_QUANT(mb_type))
|
|
s->qscale = get_qscale(s);
|
|
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
s->mv_type = MV_TYPE_16X16;
|
|
s->last_mv[0][0][0] = 0;
|
|
s->last_mv[0][0][1] = 0;
|
|
s->last_mv[0][1][0] = 0;
|
|
s->last_mv[0][1][1] = 0;
|
|
s->mv[0][0][0] = 0;
|
|
s->mv[0][0][1] = 0;
|
|
}else{
|
|
assert(mb_type & MB_TYPE_L0L1);
|
|
//FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
|
|
/* get additionnal motion vector type */
|
|
if (s->frame_pred_frame_dct)
|
|
motion_type = MT_FRAME;
|
|
else{
|
|
motion_type = get_bits(&s->gb, 2);
|
|
}
|
|
|
|
/* compute dct type */
|
|
if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var?
|
|
!s->frame_pred_frame_dct && IS_PAT(mb_type)) {
|
|
s->interlaced_dct = get_bits1(&s->gb);
|
|
}
|
|
|
|
if (IS_QUANT(mb_type))
|
|
s->qscale = get_qscale(s);
|
|
|
|
/* motion vectors */
|
|
s->mv_dir = 0;
|
|
for(i=0;i<2;i++) {
|
|
if (USES_LIST(mb_type, i)) {
|
|
s->mv_dir |= (MV_DIR_FORWARD >> i);
|
|
dprintf("motion_type=%d\n", motion_type);
|
|
switch(motion_type) {
|
|
case MT_FRAME: /* or MT_16X8 */
|
|
if (s->picture_structure == PICT_FRAME) {
|
|
/* MT_FRAME */
|
|
mb_type |= MB_TYPE_16x16;
|
|
s->mv_type = MV_TYPE_16X16;
|
|
s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] =
|
|
mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]);
|
|
s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] =
|
|
mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]);
|
|
/* full_pel: only for mpeg1 */
|
|
if (s->full_pel[i]){
|
|
s->mv[i][0][0] <<= 1;
|
|
s->mv[i][0][1] <<= 1;
|
|
}
|
|
} else {
|
|
/* MT_16X8 */
|
|
mb_type |= MB_TYPE_16x8;
|
|
s->mv_type = MV_TYPE_16X8;
|
|
for(j=0;j<2;j++) {
|
|
s->field_select[i][j] = get_bits1(&s->gb);
|
|
for(k=0;k<2;k++) {
|
|
val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
|
|
s->last_mv[i][j][k]);
|
|
s->last_mv[i][j][k] = val;
|
|
s->mv[i][j][k] = val;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case MT_FIELD:
|
|
s->mv_type = MV_TYPE_FIELD;
|
|
if (s->picture_structure == PICT_FRAME) {
|
|
mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
|
|
for(j=0;j<2;j++) {
|
|
s->field_select[i][j] = get_bits1(&s->gb);
|
|
val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
|
|
s->last_mv[i][j][0]);
|
|
s->last_mv[i][j][0] = val;
|
|
s->mv[i][j][0] = val;
|
|
dprintf("fmx=%d\n", val);
|
|
val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
|
|
s->last_mv[i][j][1] >> 1);
|
|
s->last_mv[i][j][1] = val << 1;
|
|
s->mv[i][j][1] = val;
|
|
dprintf("fmy=%d\n", val);
|
|
}
|
|
} else {
|
|
mb_type |= MB_TYPE_16x16;
|
|
s->field_select[i][0] = get_bits1(&s->gb);
|
|
for(k=0;k<2;k++) {
|
|
val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
|
|
s->last_mv[i][0][k]);
|
|
s->last_mv[i][0][k] = val;
|
|
s->last_mv[i][1][k] = val;
|
|
s->mv[i][0][k] = val;
|
|
}
|
|
}
|
|
break;
|
|
case MT_DMV:
|
|
{
|
|
int dmx, dmy, mx, my, m;
|
|
|
|
mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
|
|
s->last_mv[i][0][0]);
|
|
s->last_mv[i][0][0] = mx;
|
|
s->last_mv[i][1][0] = mx;
|
|
dmx = get_dmv(s);
|
|
my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
|
|
s->last_mv[i][0][1] >> 1);
|
|
dmy = get_dmv(s);
|
|
s->mv_type = MV_TYPE_DMV;
|
|
/* XXX: totally broken */
|
|
if (s->picture_structure == PICT_FRAME) {
|
|
mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
|
|
|
|
s->last_mv[i][0][1] = my << 1;
|
|
s->last_mv[i][1][1] = my << 1;
|
|
|
|
m = s->top_field_first ? 1 : 3;
|
|
/* top -> top pred */
|
|
s->mv[i][0][0] = mx;
|
|
s->mv[i][0][1] = my << 1;
|
|
s->mv[i][1][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
|
|
s->mv[i][1][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
|
|
m = 4 - m;
|
|
s->mv[i][2][0] = mx;
|
|
s->mv[i][2][1] = my << 1;
|
|
s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
|
|
s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
|
|
} else {
|
|
mb_type |= MB_TYPE_16x16;
|
|
|
|
s->last_mv[i][0][1] = my;
|
|
s->last_mv[i][1][1] = my;
|
|
s->mv[i][0][0] = mx;
|
|
s->mv[i][0][1] = my;
|
|
s->mv[i][1][0] = ((mx + (mx > 0)) >> 1) + dmx;
|
|
s->mv[i][1][1] = ((my + (my > 0)) >> 1) + dmy - 1
|
|
/* + 2 * cur_field */;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
s->mb_intra = 0;
|
|
|
|
if (IS_PAT(mb_type)) {
|
|
cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
|
|
if (cbp < 0){
|
|
fprintf(stderr, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
cbp++;
|
|
|
|
if (s->mpeg2) {
|
|
for(i=0;i<6;i++) {
|
|
if (cbp & 32) {
|
|
if (mpeg2_decode_block_non_intra(s, block[i], i) < 0)
|
|
return -1;
|
|
} else {
|
|
s->block_last_index[i] = -1;
|
|
}
|
|
cbp+=cbp;
|
|
}
|
|
} else {
|
|
for(i=0;i<6;i++) {
|
|
if (cbp & 32) {
|
|
if (mpeg1_decode_block_inter(s, block[i], i) < 0)
|
|
return -1;
|
|
} else {
|
|
s->block_last_index[i] = -1;
|
|
}
|
|
cbp+=cbp;
|
|
}
|
|
}
|
|
}else{
|
|
for(i=0;i<6;i++)
|
|
s->block_last_index[i] = -1;
|
|
}
|
|
}
|
|
|
|
s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* as h263, but only 17 codes */
|
|
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
|
|
{
|
|
int code, sign, val, m, l, shift;
|
|
|
|
code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
|
|
if (code == 0) {
|
|
return pred;
|
|
}
|
|
if (code < 0) {
|
|
return 0xffff;
|
|
}
|
|
|
|
sign = get_bits1(&s->gb);
|
|
shift = fcode - 1;
|
|
val = (code - 1) << shift;
|
|
if (shift > 0)
|
|
val |= get_bits(&s->gb, shift);
|
|
val++;
|
|
if (sign)
|
|
val = -val;
|
|
val += pred;
|
|
|
|
/* modulo decoding */
|
|
l = 1 << (shift+4);
|
|
m = 2 * l;
|
|
if (val < -l) {
|
|
val += m;
|
|
} else if (val >= l) {
|
|
val -= m;
|
|
}
|
|
return val;
|
|
}
|
|
|
|
static inline int decode_dc(MpegEncContext *s, int component)
|
|
{
|
|
int code, diff;
|
|
|
|
if (component == 0) {
|
|
code = get_vlc2(&s->gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
|
|
} else {
|
|
code = get_vlc2(&s->gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
|
|
}
|
|
if (code < 0){
|
|
fprintf(stderr, "invalid dc code at %d %d\n", s->mb_x, s->mb_y);
|
|
return 0xffff;
|
|
}
|
|
if (code == 0) {
|
|
diff = 0;
|
|
} else {
|
|
diff = get_bits(&s->gb, code);
|
|
if ((diff & (1 << (code - 1))) == 0)
|
|
diff = (-1 << code) | (diff + 1);
|
|
}
|
|
return diff;
|
|
}
|
|
|
|
static inline int mpeg1_decode_block_intra(MpegEncContext *s,
|
|
DCTELEM *block,
|
|
int n)
|
|
{
|
|
int level, dc, diff, i, j, run;
|
|
int component;
|
|
RLTable *rl = &rl_mpeg1;
|
|
uint8_t * const scantable= s->intra_scantable.permutated;
|
|
const uint16_t *quant_matrix= s->intra_matrix;
|
|
const int qscale= s->qscale;
|
|
|
|
/* DC coef */
|
|
component = (n <= 3 ? 0 : n - 4 + 1);
|
|
diff = decode_dc(s, component);
|
|
if (diff >= 0xffff)
|
|
return -1;
|
|
dc = s->last_dc[component];
|
|
dc += diff;
|
|
s->last_dc[component] = dc;
|
|
block[0] = dc<<3;
|
|
dprintf("dc=%d diff=%d\n", dc, diff);
|
|
i = 0;
|
|
{
|
|
OPEN_READER(re, &s->gb);
|
|
/* now quantify & encode AC coefs */
|
|
for(;;) {
|
|
UPDATE_CACHE(re, &s->gb);
|
|
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
|
|
|
|
if(level == 127){
|
|
break;
|
|
} else if(level != 0) {
|
|
i += run;
|
|
j = scantable[i];
|
|
level= (level*qscale*quant_matrix[j])>>3;
|
|
level= (level-1)|1;
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
|
|
LAST_SKIP_BITS(re, &s->gb, 1);
|
|
} else {
|
|
/* escape */
|
|
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
|
|
UPDATE_CACHE(re, &s->gb);
|
|
level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
|
|
if (level == -128) {
|
|
level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
|
|
} else if (level == 0) {
|
|
level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
|
|
}
|
|
i += run;
|
|
j = scantable[i];
|
|
if(level<0){
|
|
level= -level;
|
|
level= (level*qscale*quant_matrix[j])>>3;
|
|
level= (level-1)|1;
|
|
level= -level;
|
|
}else{
|
|
level= (level*qscale*quant_matrix[j])>>3;
|
|
level= (level-1)|1;
|
|
}
|
|
}
|
|
if (i > 63){
|
|
fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
block[j] = level;
|
|
}
|
|
CLOSE_READER(re, &s->gb);
|
|
}
|
|
s->block_last_index[n] = i;
|
|
return 0;
|
|
}
|
|
|
|
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
|
|
DCTELEM *block,
|
|
int n)
|
|
{
|
|
int level, i, j, run;
|
|
RLTable *rl = &rl_mpeg1;
|
|
uint8_t * const scantable= s->intra_scantable.permutated;
|
|
const uint16_t *quant_matrix= s->inter_matrix;
|
|
const int qscale= s->qscale;
|
|
|
|
{
|
|
int v;
|
|
OPEN_READER(re, &s->gb);
|
|
i = -1;
|
|
/* special case for the first coef. no need to add a second vlc table */
|
|
UPDATE_CACHE(re, &s->gb);
|
|
v= SHOW_UBITS(re, &s->gb, 2);
|
|
if (v & 2) {
|
|
LAST_SKIP_BITS(re, &s->gb, 2);
|
|
level= (3*qscale*quant_matrix[0])>>4;
|
|
level= (level-1)|1;
|
|
if(v&1)
|
|
level= -level;
|
|
block[0] = level;
|
|
i++;
|
|
}
|
|
|
|
/* now quantify & encode AC coefs */
|
|
for(;;) {
|
|
UPDATE_CACHE(re, &s->gb);
|
|
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
|
|
|
|
if(level == 127){
|
|
break;
|
|
} else if(level != 0) {
|
|
i += run;
|
|
j = scantable[i];
|
|
level= ((level*2+1)*qscale*quant_matrix[j])>>4;
|
|
level= (level-1)|1;
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
|
|
LAST_SKIP_BITS(re, &s->gb, 1);
|
|
} else {
|
|
/* escape */
|
|
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
|
|
UPDATE_CACHE(re, &s->gb);
|
|
level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
|
|
if (level == -128) {
|
|
level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
|
|
} else if (level == 0) {
|
|
level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
|
|
}
|
|
i += run;
|
|
j = scantable[i];
|
|
if(level<0){
|
|
level= -level;
|
|
level= ((level*2+1)*qscale*quant_matrix[j])>>4;
|
|
level= (level-1)|1;
|
|
level= -level;
|
|
}else{
|
|
level= ((level*2+1)*qscale*quant_matrix[j])>>4;
|
|
level= (level-1)|1;
|
|
}
|
|
}
|
|
if (i > 63){
|
|
fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
block[j] = level;
|
|
}
|
|
CLOSE_READER(re, &s->gb);
|
|
}
|
|
s->block_last_index[n] = i;
|
|
return 0;
|
|
}
|
|
|
|
/* Also does unquantization here, since I will never support mpeg2
|
|
encoding */
|
|
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
|
|
DCTELEM *block,
|
|
int n)
|
|
{
|
|
int level, i, j, run;
|
|
RLTable *rl = &rl_mpeg1;
|
|
uint8_t * const scantable= s->intra_scantable.permutated;
|
|
const uint16_t *quant_matrix;
|
|
const int qscale= s->qscale;
|
|
int mismatch;
|
|
|
|
mismatch = 1;
|
|
|
|
{
|
|
int v;
|
|
OPEN_READER(re, &s->gb);
|
|
i = -1;
|
|
if (n < 4)
|
|
quant_matrix = s->inter_matrix;
|
|
else
|
|
quant_matrix = s->chroma_inter_matrix;
|
|
|
|
/* special case for the first coef. no need to add a second vlc table */
|
|
UPDATE_CACHE(re, &s->gb);
|
|
v= SHOW_UBITS(re, &s->gb, 2);
|
|
if (v & 2) {
|
|
LAST_SKIP_BITS(re, &s->gb, 2);
|
|
level= (3*qscale*quant_matrix[0])>>5;
|
|
if(v&1)
|
|
level= -level;
|
|
block[0] = level;
|
|
mismatch ^= level;
|
|
i++;
|
|
}
|
|
|
|
/* now quantify & encode AC coefs */
|
|
for(;;) {
|
|
UPDATE_CACHE(re, &s->gb);
|
|
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
|
|
|
|
if(level == 127){
|
|
break;
|
|
} else if(level != 0) {
|
|
i += run;
|
|
j = scantable[i];
|
|
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
|
|
LAST_SKIP_BITS(re, &s->gb, 1);
|
|
} else {
|
|
/* escape */
|
|
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
|
|
UPDATE_CACHE(re, &s->gb);
|
|
level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
|
|
|
|
i += run;
|
|
j = scantable[i];
|
|
if(level<0){
|
|
level= ((-level*2+1)*qscale*quant_matrix[j])>>5;
|
|
level= -level;
|
|
}else{
|
|
level= ((level*2+1)*qscale*quant_matrix[j])>>5;
|
|
}
|
|
}
|
|
if (i > 63){
|
|
fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
mismatch ^= level;
|
|
block[j] = level;
|
|
}
|
|
CLOSE_READER(re, &s->gb);
|
|
}
|
|
block[63] ^= (mismatch & 1);
|
|
|
|
s->block_last_index[n] = i;
|
|
return 0;
|
|
}
|
|
|
|
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
|
|
DCTELEM *block,
|
|
int n)
|
|
{
|
|
int level, dc, diff, i, j, run;
|
|
int component;
|
|
RLTable *rl;
|
|
uint8_t * const scantable= s->intra_scantable.permutated;
|
|
const uint16_t *quant_matrix;
|
|
const int qscale= s->qscale;
|
|
int mismatch;
|
|
|
|
/* DC coef */
|
|
if (n < 4){
|
|
quant_matrix = s->intra_matrix;
|
|
component = 0;
|
|
}else{
|
|
quant_matrix = s->chroma_intra_matrix;
|
|
component = n - 3;
|
|
}
|
|
diff = decode_dc(s, component);
|
|
if (diff >= 0xffff)
|
|
return -1;
|
|
dc = s->last_dc[component];
|
|
dc += diff;
|
|
s->last_dc[component] = dc;
|
|
block[0] = dc << (3 - s->intra_dc_precision);
|
|
dprintf("dc=%d\n", block[0]);
|
|
mismatch = block[0] ^ 1;
|
|
i = 0;
|
|
if (s->intra_vlc_format)
|
|
rl = &rl_mpeg2;
|
|
else
|
|
rl = &rl_mpeg1;
|
|
|
|
{
|
|
OPEN_READER(re, &s->gb);
|
|
/* now quantify & encode AC coefs */
|
|
for(;;) {
|
|
UPDATE_CACHE(re, &s->gb);
|
|
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
|
|
|
|
if(level == 127){
|
|
break;
|
|
} else if(level != 0) {
|
|
i += run;
|
|
j = scantable[i];
|
|
level= (level*qscale*quant_matrix[j])>>4;
|
|
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
|
|
LAST_SKIP_BITS(re, &s->gb, 1);
|
|
} else {
|
|
/* escape */
|
|
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
|
|
UPDATE_CACHE(re, &s->gb);
|
|
level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
|
|
i += run;
|
|
j = scantable[i];
|
|
if(level<0){
|
|
level= (-level*qscale*quant_matrix[j])>>4;
|
|
level= -level;
|
|
}else{
|
|
level= (level*qscale*quant_matrix[j])>>4;
|
|
}
|
|
}
|
|
if (i > 63){
|
|
fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
|
|
return -1;
|
|
}
|
|
|
|
mismatch^= level;
|
|
block[j] = level;
|
|
}
|
|
CLOSE_READER(re, &s->gb);
|
|
}
|
|
block[63]^= mismatch&1;
|
|
|
|
s->block_last_index[n] = i;
|
|
return 0;
|
|
}
|
|
|
|
typedef struct Mpeg1Context {
|
|
MpegEncContext mpeg_enc_ctx;
|
|
int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
|
|
int repeat_field; /* true if we must repeat the field */
|
|
} Mpeg1Context;
|
|
|
|
static int mpeg_decode_init(AVCodecContext *avctx)
|
|
{
|
|
Mpeg1Context *s = avctx->priv_data;
|
|
|
|
s->mpeg_enc_ctx.flags= avctx->flags;
|
|
common_init(&s->mpeg_enc_ctx);
|
|
init_vlcs(&s->mpeg_enc_ctx);
|
|
|
|
s->mpeg_enc_ctx_allocated = 0;
|
|
s->mpeg_enc_ctx.picture_number = 0;
|
|
s->repeat_field = 0;
|
|
s->mpeg_enc_ctx.codec_id= avctx->codec->id;
|
|
return 0;
|
|
}
|
|
|
|
/* return the 8 bit start code value and update the search
|
|
state. Return -1 if no start code found */
|
|
static int find_start_code(uint8_t **pbuf_ptr, uint8_t *buf_end)
|
|
{
|
|
uint8_t *buf_ptr;
|
|
unsigned int state=0xFFFFFFFF, v;
|
|
int val;
|
|
|
|
buf_ptr = *pbuf_ptr;
|
|
while (buf_ptr < buf_end) {
|
|
v = *buf_ptr++;
|
|
if (state == 0x000001) {
|
|
state = ((state << 8) | v) & 0xffffff;
|
|
val = state;
|
|
goto found;
|
|
}
|
|
state = ((state << 8) | v) & 0xffffff;
|
|
}
|
|
val = -1;
|
|
found:
|
|
*pbuf_ptr = buf_ptr;
|
|
return val;
|
|
}
|
|
|
|
static int mpeg1_decode_picture(AVCodecContext *avctx,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
int ref, f_code;
|
|
|
|
init_get_bits(&s->gb, buf, buf_size*8);
|
|
|
|
ref = get_bits(&s->gb, 10); /* temporal ref */
|
|
s->pict_type = get_bits(&s->gb, 3);
|
|
dprintf("pict_type=%d number=%d\n", s->pict_type, s->picture_number);
|
|
|
|
skip_bits(&s->gb, 16);
|
|
if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
|
|
s->full_pel[0] = get_bits1(&s->gb);
|
|
f_code = get_bits(&s->gb, 3);
|
|
if (f_code == 0)
|
|
return -1;
|
|
s->mpeg_f_code[0][0] = f_code;
|
|
s->mpeg_f_code[0][1] = f_code;
|
|
}
|
|
if (s->pict_type == B_TYPE) {
|
|
s->full_pel[1] = get_bits1(&s->gb);
|
|
f_code = get_bits(&s->gb, 3);
|
|
if (f_code == 0)
|
|
return -1;
|
|
s->mpeg_f_code[1][0] = f_code;
|
|
s->mpeg_f_code[1][1] = f_code;
|
|
}
|
|
s->current_picture.pict_type= s->pict_type;
|
|
s->current_picture.key_frame= s->pict_type == I_TYPE;
|
|
|
|
s->y_dc_scale = 8;
|
|
s->c_dc_scale = 8;
|
|
s->first_slice = 1;
|
|
return 0;
|
|
}
|
|
|
|
static void mpeg_decode_sequence_extension(MpegEncContext *s)
|
|
{
|
|
int horiz_size_ext, vert_size_ext;
|
|
int bit_rate_ext, vbv_buf_ext;
|
|
int frame_rate_ext_n, frame_rate_ext_d;
|
|
float aspect;
|
|
|
|
skip_bits(&s->gb, 8); /* profil and level */
|
|
s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
|
|
skip_bits(&s->gb, 2); /* chroma_format */
|
|
horiz_size_ext = get_bits(&s->gb, 2);
|
|
vert_size_ext = get_bits(&s->gb, 2);
|
|
s->width |= (horiz_size_ext << 12);
|
|
s->height |= (vert_size_ext << 12);
|
|
bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */
|
|
s->bit_rate = ((s->bit_rate / 400) | (bit_rate_ext << 12)) * 400;
|
|
skip_bits1(&s->gb); /* marker */
|
|
vbv_buf_ext = get_bits(&s->gb, 8);
|
|
s->low_delay = get_bits1(&s->gb);
|
|
frame_rate_ext_n = get_bits(&s->gb, 2);
|
|
frame_rate_ext_d = get_bits(&s->gb, 5);
|
|
av_reduce(
|
|
&s->avctx->frame_rate,
|
|
&s->avctx->frame_rate_base,
|
|
frame_rate_tab[s->frame_rate_index] * (frame_rate_ext_n+1),
|
|
MPEG1_FRAME_RATE_BASE * (frame_rate_ext_d+1),
|
|
1<<30);
|
|
|
|
dprintf("sequence extension\n");
|
|
s->mpeg2 = 1;
|
|
s->avctx->sub_id = 2; /* indicates mpeg2 found */
|
|
|
|
aspect= mpeg2_aspect[s->aspect_ratio_info];
|
|
if(aspect>0.0) s->avctx->aspect_ratio= s->width/(aspect*s->height);
|
|
else if(aspect<0.0) s->avctx->aspect_ratio= -1.0/aspect;
|
|
}
|
|
|
|
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
|
|
{
|
|
int i, v, j;
|
|
|
|
dprintf("matrix extension\n");
|
|
|
|
if (get_bits1(&s->gb)) {
|
|
for(i=0;i<64;i++) {
|
|
v = get_bits(&s->gb, 8);
|
|
j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
|
|
s->intra_matrix[j] = v;
|
|
s->chroma_intra_matrix[j] = v;
|
|
}
|
|
}
|
|
if (get_bits1(&s->gb)) {
|
|
for(i=0;i<64;i++) {
|
|
v = get_bits(&s->gb, 8);
|
|
j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
|
|
s->inter_matrix[j] = v;
|
|
s->chroma_inter_matrix[j] = v;
|
|
}
|
|
}
|
|
if (get_bits1(&s->gb)) {
|
|
for(i=0;i<64;i++) {
|
|
v = get_bits(&s->gb, 8);
|
|
j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
|
|
s->chroma_intra_matrix[j] = v;
|
|
}
|
|
}
|
|
if (get_bits1(&s->gb)) {
|
|
for(i=0;i<64;i++) {
|
|
v = get_bits(&s->gb, 8);
|
|
j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
|
|
s->chroma_inter_matrix[j] = v;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void mpeg_decode_picture_coding_extension(MpegEncContext *s)
|
|
{
|
|
s->full_pel[0] = s->full_pel[1] = 0;
|
|
s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
|
|
s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
|
|
s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
|
|
s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
|
|
s->intra_dc_precision = get_bits(&s->gb, 2);
|
|
s->picture_structure = get_bits(&s->gb, 2);
|
|
s->top_field_first = get_bits1(&s->gb);
|
|
s->frame_pred_frame_dct = get_bits1(&s->gb);
|
|
s->concealment_motion_vectors = get_bits1(&s->gb);
|
|
s->q_scale_type = get_bits1(&s->gb);
|
|
s->intra_vlc_format = get_bits1(&s->gb);
|
|
s->alternate_scan = get_bits1(&s->gb);
|
|
s->repeat_first_field = get_bits1(&s->gb);
|
|
s->chroma_420_type = get_bits1(&s->gb);
|
|
s->progressive_frame = get_bits1(&s->gb);
|
|
|
|
if(s->picture_structure == PICT_FRAME)
|
|
s->first_field=0;
|
|
else{
|
|
s->first_field ^= 1;
|
|
memset(s->mbskip_table, 0, s->mb_stride*s->mb_height);
|
|
}
|
|
|
|
if(s->alternate_scan){
|
|
ff_init_scantable(s, &s->inter_scantable , ff_alternate_vertical_scan);
|
|
ff_init_scantable(s, &s->intra_scantable , ff_alternate_vertical_scan);
|
|
ff_init_scantable(s, &s->intra_h_scantable, ff_alternate_vertical_scan);
|
|
ff_init_scantable(s, &s->intra_v_scantable, ff_alternate_vertical_scan);
|
|
}else{
|
|
ff_init_scantable(s, &s->inter_scantable , ff_zigzag_direct);
|
|
ff_init_scantable(s, &s->intra_scantable , ff_zigzag_direct);
|
|
ff_init_scantable(s, &s->intra_h_scantable, ff_alternate_horizontal_scan);
|
|
ff_init_scantable(s, &s->intra_v_scantable, ff_alternate_vertical_scan);
|
|
}
|
|
|
|
/* composite display not parsed */
|
|
dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
|
|
dprintf("picture_structure=%d\n", s->picture_structure);
|
|
dprintf("top field first=%d\n", s->top_field_first);
|
|
dprintf("repeat first field=%d\n", s->repeat_first_field);
|
|
dprintf("conceal=%d\n", s->concealment_motion_vectors);
|
|
dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
|
|
dprintf("alternate_scan=%d\n", s->alternate_scan);
|
|
dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
|
|
dprintf("progressive_frame=%d\n", s->progressive_frame);
|
|
}
|
|
|
|
static void mpeg_decode_extension(AVCodecContext *avctx,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
int ext_type;
|
|
|
|
init_get_bits(&s->gb, buf, buf_size*8);
|
|
|
|
ext_type = get_bits(&s->gb, 4);
|
|
switch(ext_type) {
|
|
case 0x1:
|
|
/* sequence ext */
|
|
mpeg_decode_sequence_extension(s);
|
|
break;
|
|
case 0x3:
|
|
/* quant matrix extension */
|
|
mpeg_decode_quant_matrix_extension(s);
|
|
break;
|
|
case 0x8:
|
|
/* picture extension */
|
|
mpeg_decode_picture_coding_extension(s);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#define DECODE_SLICE_MB_ADDR_ERROR -3 //we faild decoding the mb_x/y info
|
|
#define DECODE_SLICE_FATAL_ERROR -2
|
|
#define DECODE_SLICE_ERROR -1
|
|
#define DECODE_SLICE_OK 0
|
|
#define DECODE_SLICE_EOP 1
|
|
|
|
/**
|
|
* decodes a slice.
|
|
* @return DECODE_SLICE_FATAL_ERROR if a non recoverable error occured<br>
|
|
* DECODE_SLICE_ERROR if the slice is damaged<br>
|
|
* DECODE_SLICE_OK if this slice is ok<br>
|
|
* DECODE_SLICE_EOP if the end of the picture is reached
|
|
*/
|
|
static int mpeg_decode_slice(AVCodecContext *avctx,
|
|
AVFrame *pict,
|
|
int start_code,
|
|
uint8_t **buf, int buf_size)
|
|
{
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
int ret;
|
|
const int field_pic= s->picture_structure != PICT_FRAME;
|
|
|
|
start_code = (start_code - 1) & 0xff;
|
|
if (start_code >= s->mb_height){
|
|
fprintf(stderr, "slice below image (%d >= %d)\n", start_code, s->mb_height);
|
|
return DECODE_SLICE_MB_ADDR_ERROR;
|
|
}
|
|
|
|
ff_mpeg1_clean_buffers(s);
|
|
s->interlaced_dct = 0;
|
|
|
|
/* start frame decoding */
|
|
if (s->first_slice) {
|
|
if(s->first_field || s->picture_structure==PICT_FRAME){
|
|
if(MPV_frame_start(s, avctx) < 0)
|
|
return DECODE_SLICE_FATAL_ERROR;
|
|
|
|
ff_er_frame_start(s);
|
|
|
|
/* first check if we must repeat the frame */
|
|
s->current_picture.repeat_pict = 0;
|
|
|
|
if (s->repeat_first_field) {
|
|
if (s->progressive_sequence) {
|
|
if (s->top_field_first)
|
|
s->current_picture.repeat_pict = 4;
|
|
else
|
|
s->current_picture.repeat_pict = 2;
|
|
} else if (s->progressive_frame) {
|
|
s->current_picture.repeat_pict = 1;
|
|
}
|
|
}
|
|
// printf("%d \n", s->current_picture.repeat_pict);
|
|
|
|
if(s->avctx->debug&FF_DEBUG_PICT_INFO){
|
|
printf("qp:%d fc:%2d%2d%2d%2d %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
|
|
s->qscale, s->mpeg_f_code[0][0],s->mpeg_f_code[0][1],s->mpeg_f_code[1][0],s->mpeg_f_code[1][1],
|
|
s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
|
|
s->progressive_sequence ? "pro" :"", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"",
|
|
s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors,
|
|
s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :"");
|
|
}
|
|
}else{ //second field
|
|
int i;
|
|
|
|
if(!s->current_picture_ptr){
|
|
fprintf(stderr, "first field missing\n");
|
|
return -1;
|
|
}
|
|
|
|
for(i=0; i<4; i++){
|
|
s->current_picture.data[i] = s->current_picture_ptr->data[i];
|
|
if(s->picture_structure == PICT_BOTTOM_FIELD){
|
|
s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
s->first_slice = 0;
|
|
|
|
init_get_bits(&s->gb, *buf, buf_size*8);
|
|
|
|
s->qscale = get_qscale(s);
|
|
if(s->qscale == 0){
|
|
fprintf(stderr, "qscale == 0\n");
|
|
return DECODE_SLICE_MB_ADDR_ERROR;
|
|
}
|
|
|
|
/* extra slice info */
|
|
while (get_bits1(&s->gb) != 0) {
|
|
skip_bits(&s->gb, 8);
|
|
}
|
|
|
|
s->mb_x=0;
|
|
|
|
for(;;) {
|
|
int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
|
|
if (code < 0){
|
|
fprintf(stderr, "first mb_incr damaged\n");
|
|
return DECODE_SLICE_MB_ADDR_ERROR;
|
|
}
|
|
if (code >= 33) {
|
|
if (code == 33) {
|
|
s->mb_x += 33;
|
|
}
|
|
/* otherwise, stuffing, nothing to do */
|
|
} else {
|
|
s->mb_x += code;
|
|
break;
|
|
}
|
|
}
|
|
|
|
s->resync_mb_x= s->mb_x;
|
|
s->resync_mb_y= s->mb_y = start_code;
|
|
s->mb_skip_run= 0;
|
|
|
|
for(;;) {
|
|
s->dsp.clear_blocks(s->block[0]);
|
|
|
|
ret = mpeg_decode_mb(s, s->block);
|
|
|
|
dprintf("ret=%d\n", ret);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
if(s->motion_val && s->pict_type != B_TYPE){ //note motion_val is normally NULL unless we want to extract the MVs
|
|
const int wrap = s->block_wrap[0];
|
|
const int xy = s->mb_x*2 + 1 + (s->mb_y*2 +1)*wrap;
|
|
int motion_x, motion_y;
|
|
|
|
if (s->mb_intra || s->mv_type == MV_TYPE_16X16) {
|
|
motion_x = s->mv[0][0][0];
|
|
motion_y = s->mv[0][0][1];
|
|
} else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
|
|
motion_x = s->mv[0][0][0] + s->mv[0][1][0];
|
|
motion_y = s->mv[0][0][1] + s->mv[0][1][1];
|
|
motion_x = (motion_x>>1) | (motion_x&1);
|
|
}
|
|
s->motion_val[xy][0] = motion_x;
|
|
s->motion_val[xy][1] = motion_y;
|
|
s->motion_val[xy + 1][0] = motion_x;
|
|
s->motion_val[xy + 1][1] = motion_y;
|
|
s->motion_val[xy + wrap][0] = motion_x;
|
|
s->motion_val[xy + wrap][1] = motion_y;
|
|
s->motion_val[xy + 1 + wrap][0] = motion_x;
|
|
s->motion_val[xy + 1 + wrap][1] = motion_y;
|
|
}
|
|
|
|
MPV_decode_mb(s, s->block);
|
|
|
|
if (++s->mb_x >= s->mb_width) {
|
|
if(s->picture_structure==PICT_FRAME){
|
|
ff_draw_horiz_band(s, 16*s->mb_y, 16);
|
|
}else{
|
|
if(!s->first_field){
|
|
ff_draw_horiz_band(s, 32*s->mb_y, 32);
|
|
}
|
|
}
|
|
|
|
s->mb_x = 0;
|
|
s->mb_y++;
|
|
}
|
|
|
|
/* skip mb handling */
|
|
if (s->mb_skip_run == -1) {
|
|
/* read again increment */
|
|
s->mb_skip_run = 0;
|
|
for(;;) {
|
|
int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
|
|
if (code < 0){
|
|
fprintf(stderr, "mb incr damaged\n");
|
|
return -1;
|
|
}
|
|
if (code >= 33) {
|
|
if (code == 33) {
|
|
s->mb_skip_run += 33;
|
|
}else if(code == 35){
|
|
if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){
|
|
fprintf(stderr, "slice missmatch\n");
|
|
return -1;
|
|
}
|
|
goto eos; /* end of slice */
|
|
}
|
|
/* otherwise, stuffing, nothing to do */
|
|
} else {
|
|
s->mb_skip_run += code;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if(s->mb_y<<field_pic >= s->mb_height){
|
|
fprintf(stderr, "slice too long\n");
|
|
return DECODE_SLICE_ERROR;
|
|
}
|
|
}
|
|
eos: //end of slice
|
|
//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
|
|
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
|
|
|
|
emms_c();
|
|
|
|
*buf += get_bits_count(&s->gb)/8 - 1;
|
|
|
|
//intf("%d %d %d %d\n", s->mb_y, s->mb_height, s->pict_type, s->picture_number);
|
|
/* end of slice reached */
|
|
if (s->mb_y<<field_pic == s->mb_height && !s->first_field) {
|
|
/* end of image */
|
|
|
|
if(s->mpeg2){
|
|
s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
|
|
}else
|
|
s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG1;
|
|
|
|
ff_er_frame_end(s);
|
|
|
|
MPV_frame_end(s);
|
|
|
|
if (s->pict_type == B_TYPE || s->low_delay) {
|
|
*pict= *(AVFrame*)&s->current_picture;
|
|
ff_print_debug_info(s, s->current_picture_ptr);
|
|
} else {
|
|
s->picture_number++;
|
|
/* latency of 1 frame for I and P frames */
|
|
/* XXX: use another variable than picture_number */
|
|
if (s->last_picture_ptr != NULL) {
|
|
*pict= *(AVFrame*)&s->last_picture;
|
|
ff_print_debug_info(s, s->last_picture_ptr);
|
|
}
|
|
}
|
|
return DECODE_SLICE_EOP;
|
|
} else {
|
|
return DECODE_SLICE_OK;
|
|
}
|
|
}
|
|
|
|
static int mpeg1_decode_sequence(AVCodecContext *avctx,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
int width, height, i, v, j;
|
|
float aspect;
|
|
|
|
init_get_bits(&s->gb, buf, buf_size*8);
|
|
|
|
width = get_bits(&s->gb, 12);
|
|
height = get_bits(&s->gb, 12);
|
|
s->aspect_ratio_info= get_bits(&s->gb, 4);
|
|
if(!s->mpeg2){
|
|
aspect= mpeg1_aspect[s->aspect_ratio_info];
|
|
if(aspect!=0.0) avctx->aspect_ratio= width/(aspect*height);
|
|
}
|
|
|
|
s->frame_rate_index = get_bits(&s->gb, 4);
|
|
if (s->frame_rate_index == 0)
|
|
return -1;
|
|
s->bit_rate = get_bits(&s->gb, 18) * 400;
|
|
if (get_bits1(&s->gb) == 0) /* marker */
|
|
return -1;
|
|
if (width <= 0 || height <= 0 ||
|
|
(width % 2) != 0 || (height % 2) != 0)
|
|
return -1;
|
|
if (width != s->width ||
|
|
height != s->height) {
|
|
/* start new mpeg1 context decoding */
|
|
s->out_format = FMT_MPEG1;
|
|
if (s1->mpeg_enc_ctx_allocated) {
|
|
MPV_common_end(s);
|
|
}
|
|
s->width = width;
|
|
s->height = height;
|
|
avctx->has_b_frames= 1;
|
|
s->avctx = avctx;
|
|
avctx->width = width;
|
|
avctx->height = height;
|
|
av_reduce(
|
|
&avctx->frame_rate,
|
|
&avctx->frame_rate_base,
|
|
frame_rate_tab[s->frame_rate_index],
|
|
MPEG1_FRAME_RATE_BASE, //FIXME store in allready reduced form
|
|
1<<30
|
|
);
|
|
avctx->bit_rate = s->bit_rate;
|
|
|
|
if (MPV_common_init(s) < 0)
|
|
return -1;
|
|
s1->mpeg_enc_ctx_allocated = 1;
|
|
}
|
|
|
|
skip_bits(&s->gb, 10); /* vbv_buffer_size */
|
|
skip_bits(&s->gb, 1);
|
|
|
|
/* get matrix */
|
|
if (get_bits1(&s->gb)) {
|
|
for(i=0;i<64;i++) {
|
|
v = get_bits(&s->gb, 8);
|
|
j = s->intra_scantable.permutated[i];
|
|
s->intra_matrix[j] = v;
|
|
s->chroma_intra_matrix[j] = v;
|
|
}
|
|
#ifdef DEBUG
|
|
dprintf("intra matrix present\n");
|
|
for(i=0;i<64;i++)
|
|
dprintf(" %d", s->intra_matrix[s->intra_scantable.permutated[i]]);
|
|
printf("\n");
|
|
#endif
|
|
} else {
|
|
for(i=0;i<64;i++) {
|
|
int j= s->dsp.idct_permutation[i];
|
|
v = ff_mpeg1_default_intra_matrix[i];
|
|
s->intra_matrix[j] = v;
|
|
s->chroma_intra_matrix[j] = v;
|
|
}
|
|
}
|
|
if (get_bits1(&s->gb)) {
|
|
for(i=0;i<64;i++) {
|
|
v = get_bits(&s->gb, 8);
|
|
j = s->intra_scantable.permutated[i];
|
|
s->inter_matrix[j] = v;
|
|
s->chroma_inter_matrix[j] = v;
|
|
}
|
|
#ifdef DEBUG
|
|
dprintf("non intra matrix present\n");
|
|
for(i=0;i<64;i++)
|
|
dprintf(" %d", s->inter_matrix[s->intra_scantable.permutated[i]]);
|
|
printf("\n");
|
|
#endif
|
|
} else {
|
|
for(i=0;i<64;i++) {
|
|
int j= s->dsp.idct_permutation[i];
|
|
v = ff_mpeg1_default_non_intra_matrix[i];
|
|
s->inter_matrix[j] = v;
|
|
s->chroma_inter_matrix[j] = v;
|
|
}
|
|
}
|
|
|
|
/* we set mpeg2 parameters so that it emulates mpeg1 */
|
|
s->progressive_sequence = 1;
|
|
s->progressive_frame = 1;
|
|
s->picture_structure = PICT_FRAME;
|
|
s->frame_pred_frame_dct = 1;
|
|
s->mpeg2 = 0;
|
|
avctx->sub_id = 1; /* indicates mpeg1 */
|
|
return 0;
|
|
}
|
|
|
|
static void mpeg_decode_user_data(AVCodecContext *avctx,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
const uint8_t *p;
|
|
int len, flags;
|
|
p = buf;
|
|
len = buf_size;
|
|
|
|
/* we parse the DTG active format information */
|
|
if (len >= 5 &&
|
|
p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
|
|
flags = p[4];
|
|
p += 5;
|
|
len -= 5;
|
|
if (flags & 0x80) {
|
|
/* skip event id */
|
|
if (len < 2)
|
|
return;
|
|
p += 2;
|
|
len -= 2;
|
|
}
|
|
if (flags & 0x40) {
|
|
if (len < 1)
|
|
return;
|
|
avctx->dtg_active_format = p[0] & 0x0f;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* finds the end of the current frame in the bitstream.
|
|
* @return the position of the first byte of the next frame, or -1
|
|
*/
|
|
static int mpeg1_find_frame_end(MpegEncContext *s, uint8_t *buf, int buf_size){
|
|
ParseContext *pc= &s->parse_context;
|
|
int i;
|
|
uint32_t state;
|
|
|
|
state= pc->state;
|
|
|
|
i=0;
|
|
if(!pc->frame_start_found){
|
|
for(i=0; i<buf_size; i++){
|
|
state= (state<<8) | buf[i];
|
|
if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
|
|
i++;
|
|
pc->frame_start_found=1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(pc->frame_start_found){
|
|
for(; i<buf_size; i++){
|
|
state= (state<<8) | buf[i];
|
|
if((state&0xFFFFFF00) == 0x100){
|
|
if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
|
|
pc->frame_start_found=0;
|
|
pc->state=-1;
|
|
return i-3;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
pc->state= state;
|
|
return END_NOT_FOUND;
|
|
}
|
|
|
|
/* handle buffering and image synchronisation */
|
|
static int mpeg_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
Mpeg1Context *s = avctx->priv_data;
|
|
uint8_t *buf_end, *buf_ptr;
|
|
int ret, start_code, input_size;
|
|
AVFrame *picture = data;
|
|
MpegEncContext *s2 = &s->mpeg_enc_ctx;
|
|
dprintf("fill_buffer\n");
|
|
|
|
*data_size = 0;
|
|
|
|
/* special case for last picture */
|
|
if (buf_size == 0) {
|
|
if (s2->picture_number > 0) {
|
|
*picture= *(AVFrame*)&s2->next_picture;
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if(s2->flags&CODEC_FLAG_TRUNCATED){
|
|
int next= mpeg1_find_frame_end(s2, buf, buf_size);
|
|
|
|
if( ff_combine_frame(s2, next, &buf, &buf_size) < 0 )
|
|
return buf_size;
|
|
}
|
|
|
|
buf_ptr = buf;
|
|
buf_end = buf + buf_size;
|
|
|
|
#if 0
|
|
if (s->repeat_field % 2 == 1) {
|
|
s->repeat_field++;
|
|
//fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
|
|
// s2->picture_number, s->repeat_field);
|
|
if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
|
|
*data_size = sizeof(AVPicture);
|
|
goto the_end;
|
|
}
|
|
}
|
|
#endif
|
|
for(;;) {
|
|
/* find start next code */
|
|
start_code = find_start_code(&buf_ptr, buf_end);
|
|
if (start_code < 0){
|
|
printf("missing end of picture\n");
|
|
return FFMAX(1, buf_ptr - buf - s2->parse_context.last_index);
|
|
}
|
|
|
|
/* prepare data for next start code */
|
|
input_size = buf_end - buf_ptr;
|
|
switch(start_code) {
|
|
case SEQ_START_CODE:
|
|
mpeg1_decode_sequence(avctx, buf_ptr,
|
|
input_size);
|
|
break;
|
|
|
|
case PICTURE_START_CODE:
|
|
/* we have a complete image : we try to decompress it */
|
|
mpeg1_decode_picture(avctx,
|
|
buf_ptr, input_size);
|
|
break;
|
|
case EXT_START_CODE:
|
|
mpeg_decode_extension(avctx,
|
|
buf_ptr, input_size);
|
|
break;
|
|
case USER_START_CODE:
|
|
mpeg_decode_user_data(avctx,
|
|
buf_ptr, input_size);
|
|
break;
|
|
default:
|
|
if (start_code >= SLICE_MIN_START_CODE &&
|
|
start_code <= SLICE_MAX_START_CODE) {
|
|
|
|
/* skip b frames if we dont have reference frames */
|
|
if(s2->last_picture_ptr==NULL && s2->pict_type==B_TYPE) break;
|
|
/* skip b frames if we are in a hurry */
|
|
if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
|
|
/* skip everything if we are in a hurry>=5 */
|
|
if(avctx->hurry_up>=5) break;
|
|
|
|
if (!s->mpeg_enc_ctx_allocated) break;
|
|
|
|
ret = mpeg_decode_slice(avctx, picture,
|
|
start_code, &buf_ptr, input_size);
|
|
|
|
if (ret == DECODE_SLICE_EOP) {
|
|
if(s2->last_picture_ptr) //FIXME merge with the stuff in mpeg_decode_slice
|
|
*data_size = sizeof(AVPicture);
|
|
return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
|
|
}else if(ret < 0){
|
|
if(ret == DECODE_SLICE_ERROR)
|
|
ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
|
|
|
|
fprintf(stderr,"Error while decoding slice\n");
|
|
if(ret==DECODE_SLICE_FATAL_ERROR) return -1;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int mpeg_decode_end(AVCodecContext *avctx)
|
|
{
|
|
Mpeg1Context *s = avctx->priv_data;
|
|
|
|
if (s->mpeg_enc_ctx_allocated)
|
|
MPV_common_end(&s->mpeg_enc_ctx);
|
|
return 0;
|
|
}
|
|
|
|
AVCodec mpeg_decoder = {
|
|
"mpegvideo",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_MPEG1VIDEO,
|
|
sizeof(Mpeg1Context),
|
|
mpeg_decode_init,
|
|
NULL,
|
|
mpeg_decode_end,
|
|
mpeg_decode_frame,
|
|
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED,
|
|
};
|