2001-07-22 14:18:56 +00:00
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/*
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* MPEG1 encoder / MPEG2 decoder
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* Copyright (c) 2000,2001 Gerard Lantau.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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2001-08-15 22:33:03 +00:00
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//#define DEBUG
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2001-07-22 14:18:56 +00:00
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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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2002-02-13 15:26:28 +00:00
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#define ABS(a) ((a)<0 ? -(a) : (a))
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2001-07-22 14:18:56 +00:00
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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);
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static void mpeg1_skip_picture(MpegEncContext *s, int pict_num);
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static int mpeg1_decode_block(MpegEncContext *s,
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DCTELEM *block,
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int n);
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static 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 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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2002-03-24 23:45:13 +00:00
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static UINT16 mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
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2002-03-22 23:22:08 +00:00
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static UINT8 fcode_tab[MAX_MV*2+1];
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2001-07-22 14:18:56 +00:00
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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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2002-02-13 04:19:10 +00:00
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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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2001-07-22 14:18:56 +00:00
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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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2001-07-23 18:58:11 +00:00
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unsigned int fps, v;
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int n;
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2001-07-22 14:18:56 +00:00
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UINT64 time_code;
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2002-03-22 02:21:17 +00:00
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if (s->picture_in_gop_number == 0) {
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2001-07-22 14:18:56 +00:00
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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<9;i++) {
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d = abs(s->frame_rate - 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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put_bits(&s->pb, 4, 1); /* 1/1 aspect ratio */
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put_bits(&s->pb, 4, s->frame_rate_index);
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v = s->bit_rate / 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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/* vbv buffer size: slightly greater than an I frame. We add
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some margin just in case */
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vbv_buffer_size = (3 * s->I_frame_bits) / (2 * 8);
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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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2002-02-18 01:58:00 +00:00
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time_code = (INT64)s->fake_picture_number * FRAME_RATE_BASE;
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2001-07-22 14:18:56 +00:00
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s->gop_picture_number = s->fake_picture_number;
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2001-08-13 21:48:05 +00:00
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put_bits(&s->pb, 5, (UINT32)((time_code / (fps * 3600)) % 24));
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put_bits(&s->pb, 6, (UINT32)((time_code / (fps * 60)) % 60));
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2001-07-22 14:18:56 +00:00
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put_bits(&s->pb, 1, 1);
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2001-08-13 21:48:05 +00:00
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put_bits(&s->pb, 6, (UINT32)((time_code / fps) % 60));
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put_bits(&s->pb, 6, (UINT32)((time_code % fps) / FRAME_RATE_BASE));
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2001-07-22 14:18:56 +00:00
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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->frame_rate < (24 * 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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2002-02-18 01:58:00 +00:00
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n = (((INT64)s->picture_number * fps) / s->frame_rate) - 1;
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2001-07-22 14:18:56 +00:00
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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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/* 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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unsigned int mb_incr;
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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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mb_incr = 1;
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put_bits(&s->pb, mbAddrIncrTable[mb_incr - 1][1],
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mbAddrIncrTable[mb_incr - 1][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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mb_incr = s->mb_width * s->mb_height - 1;
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while (mb_incr > 33) {
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put_bits(&s->pb, 11, 0x008);
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mb_incr -= 33;
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}
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put_bits(&s->pb, mbAddrIncrTable[mb_incr - 1][1],
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mbAddrIncrTable[mb_incr - 1][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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}
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void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
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{
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2002-02-13 04:19:10 +00:00
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static int done=0;
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2001-07-22 14:18:56 +00:00
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if (!done) {
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2002-02-13 04:19:10 +00:00
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int i;
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2001-07-22 14:18:56 +00:00
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done = 1;
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init_rl(&rl_mpeg1);
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2002-02-13 04:19:10 +00:00
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for(i=0; i<64; i++)
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{
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mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i];
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mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i];
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}
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2002-02-13 15:26:28 +00:00
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/* build unified dc encoding tables */
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for(i=-255; i<256; i++)
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{
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int adiff, index;
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int bits, code;
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int diff=i;
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adiff = ABS(diff);
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if(diff<0) diff--;
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index = vlc_dc_table[adiff];
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bits= vlc_dc_lum_bits[index] + index;
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code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1));
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mpeg1_lum_dc_uni[i+255]= bits + (code<<8);
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bits= vlc_dc_chroma_bits[index] + index;
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code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1));
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mpeg1_chr_dc_uni[i+255]= bits + (code<<8);
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}
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2001-07-22 14:18:56 +00:00
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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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put_bits(&s->pb, 10, (s->fake_picture_number -
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s->gop_picture_number) & 0x3ff);
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2002-03-20 11:16:07 +00:00
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s->fake_picture_number++;
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2001-07-22 14:18:56 +00:00
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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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if (s->pict_type == P_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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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, 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 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 mb_incr, i, cbp, mb_x, mb_y;
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mb_x = s->mb_x;
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mb_y = s->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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/* skip macroblock, except if first or last macroblock of a slice */
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if ((cbp | motion_x | motion_y) == 0 &&
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(!((mb_x | mb_y) == 0 ||
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(mb_x == s->mb_width - 1 && mb_y == s->mb_height - 1)))) {
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s->mb_incr++;
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} else {
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/* output mb incr */
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mb_incr = s->mb_incr;
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while (mb_incr > 33) {
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put_bits(&s->pb, 11, 0x008);
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mb_incr -= 33;
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}
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put_bits(&s->pb, mbAddrIncrTable[mb_incr - 1][1],
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mbAddrIncrTable[mb_incr - 1][0]);
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if (s->pict_type == I_TYPE) {
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put_bits(&s->pb, 1, 1); /* macroblock_type : macroblock_quant = 0 */
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} else {
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if (s->mb_intra) {
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put_bits(&s->pb, 5, 0x03);
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} else {
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if (cbp != 0) {
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if (motion_x == 0 && motion_y == 0) {
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put_bits(&s->pb, 2, 1); /* macroblock_pattern only */
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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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put_bits(&s->pb, 1, 1); /* motion + cbp */
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mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0]);
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mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1]);
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put_bits(&s->pb, mbPatTable[cbp - 1][1], mbPatTable[cbp - 1][0]);
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}
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} else {
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put_bits(&s->pb, 3, 1); /* motion only */
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mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0]);
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mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1]);
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}
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}
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}
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for(i=0;i<6;i++) {
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if (cbp & (1 << (5 - i))) {
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mpeg1_encode_block(s, block[i], i);
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}
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}
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s->mb_incr = 1;
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}
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s->last_mv[0][0][0] = motion_x;
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s->last_mv[0][0][1] = motion_y;
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}
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static void mpeg1_encode_motion(MpegEncContext *s, int val)
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{
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int code, bit_size, l, m, bits, range, sign;
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if (val == 0) {
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/* zero vector */
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code = 0;
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put_bits(&s->pb,
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mbMotionVectorTable[0][1],
|
|
|
|
mbMotionVectorTable[0][0]);
|
|
|
|
} else {
|
|
|
|
bit_size = s->f_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;
|
|
|
|
}
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2002-03-22 23:22:08 +00:00
|
|
|
void mpeg1_encode_init(MpegEncContext *s)
|
|
|
|
{
|
|
|
|
static int done=0;
|
|
|
|
if(!done){
|
|
|
|
int f_code;
|
|
|
|
int mv;
|
|
|
|
|
|
|
|
done=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->mv_penalty= mv_penalty;
|
|
|
|
|
|
|
|
s->fcode_tab= fcode_tab;
|
|
|
|
}
|
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
static inline void encode_dc(MpegEncContext *s, int diff, int component)
|
|
|
|
{
|
|
|
|
if (component == 0) {
|
2002-02-13 15:26:28 +00:00
|
|
|
put_bits(
|
|
|
|
&s->pb,
|
|
|
|
mpeg1_lum_dc_uni[diff+255]&0xFF,
|
|
|
|
mpeg1_lum_dc_uni[diff+255]>>8);
|
2001-07-22 14:18:56 +00:00
|
|
|
} else {
|
2002-02-13 15:26:28 +00:00
|
|
|
put_bits(
|
|
|
|
&s->pb,
|
|
|
|
mpeg1_chr_dc_uni[diff+255]&0xFF,
|
|
|
|
mpeg1_chr_dc_uni[diff+255]>>8);
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
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;
|
2002-02-13 04:19:10 +00:00
|
|
|
// RLTable *rl = &rl_mpeg1;
|
2001-07-22 14:18:56 +00:00
|
|
|
|
|
|
|
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)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;
|
2002-02-13 04:19:10 +00:00
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
for(;i<=last_index;i++) {
|
|
|
|
j = zigzag_direct[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;
|
2002-02-13 04:19:10 +00:00
|
|
|
#ifdef ARCH_X86
|
|
|
|
asm volatile(
|
|
|
|
"movl %2, %1 \n\t"
|
|
|
|
"movl %1, %0 \n\t"
|
|
|
|
"addl %1, %1 \n\t"
|
|
|
|
"sbbl %1, %1 \n\t"
|
|
|
|
"xorl %1, %0 \n\t"
|
|
|
|
"subl %1, %0 \n\t"
|
|
|
|
"andl $1, %1 \n\t"
|
|
|
|
: "=&r" (alevel), "=&r" (sign)
|
|
|
|
: "g" (level)
|
|
|
|
);
|
|
|
|
#else
|
2001-07-22 14:18:56 +00:00
|
|
|
sign = 0;
|
|
|
|
alevel = level;
|
|
|
|
if (alevel < 0) {
|
|
|
|
sign = 1;
|
|
|
|
alevel = -alevel;
|
|
|
|
}
|
2002-02-13 04:19:10 +00:00
|
|
|
#endif
|
|
|
|
// code = get_rl_index(rl, 0, run, alevel);
|
|
|
|
if (alevel > mpeg1_max_level[0][run])
|
|
|
|
code= 111; /*rl->n*/
|
|
|
|
else
|
|
|
|
code= mpeg1_index_run[0][run] + alevel - 1;
|
|
|
|
|
|
|
|
if (code < 111 /* rl->n */) {
|
|
|
|
/* store the vlc & sign at once */
|
|
|
|
put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign);
|
2001-07-22 14:18:56 +00:00
|
|
|
} else {
|
2002-02-13 04:19:10 +00:00
|
|
|
/* 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]);
|
2001-07-22 14:18:56 +00:00
|
|
|
/* 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);
|
|
|
|
}
|
|
|
|
|
|
|
|
/******************************************/
|
|
|
|
/* 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;
|
|
|
|
|
|
|
|
void mpeg1_init_vlc(MpegEncContext *s)
|
|
|
|
{
|
|
|
|
static int done = 0;
|
|
|
|
|
|
|
|
if (!done) {
|
|
|
|
|
|
|
|
init_vlc(&dc_lum_vlc, 9, 12,
|
|
|
|
vlc_dc_lum_bits, 1, 1,
|
|
|
|
vlc_dc_lum_code, 2, 2);
|
|
|
|
init_vlc(&dc_chroma_vlc, 9, 12,
|
|
|
|
vlc_dc_chroma_bits, 1, 1,
|
|
|
|
vlc_dc_chroma_code, 2, 2);
|
|
|
|
init_vlc(&mv_vlc, 9, 17,
|
|
|
|
&mbMotionVectorTable[0][1], 2, 1,
|
|
|
|
&mbMotionVectorTable[0][0], 2, 1);
|
2001-08-08 21:53:28 +00:00
|
|
|
init_vlc(&mbincr_vlc, 9, 35,
|
2001-07-22 14:18:56 +00:00
|
|
|
&mbAddrIncrTable[0][1], 2, 1,
|
|
|
|
&mbAddrIncrTable[0][0], 2, 1);
|
|
|
|
init_vlc(&mb_pat_vlc, 9, 63,
|
|
|
|
&mbPatTable[0][1], 2, 1,
|
|
|
|
&mbPatTable[0][0], 2, 1);
|
|
|
|
|
|
|
|
init_vlc(&mb_ptype_vlc, 6, 32,
|
|
|
|
&table_mb_ptype[0][1], 2, 1,
|
|
|
|
&table_mb_ptype[0][0], 2, 1);
|
|
|
|
init_vlc(&mb_btype_vlc, 6, 32,
|
|
|
|
&table_mb_btype[0][1], 2, 1,
|
|
|
|
&table_mb_btype[0][0], 2, 1);
|
|
|
|
init_rl(&rl_mpeg1);
|
|
|
|
init_rl(&rl_mpeg2);
|
|
|
|
/* cannot use generic init because we must add the EOB code */
|
|
|
|
init_vlc(&rl_mpeg1.vlc, 9, rl_mpeg1.n + 2,
|
|
|
|
&rl_mpeg1.table_vlc[0][1], 4, 2,
|
|
|
|
&rl_mpeg1.table_vlc[0][0], 4, 2);
|
|
|
|
init_vlc(&rl_mpeg2.vlc, 9, rl_mpeg2.n + 2,
|
|
|
|
&rl_mpeg2.table_vlc[0][1], 4, 2,
|
|
|
|
&rl_mpeg2.table_vlc[0][0], 4, 2);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int get_dmv(MpegEncContext *s)
|
|
|
|
{
|
2001-08-04 00:46:50 +00:00
|
|
|
if(get_bits1(&s->gb))
|
|
|
|
return 1 - (get_bits1(&s->gb) << 1);
|
2001-07-22 14:18:56 +00:00
|
|
|
else
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2001-08-11 19:04:08 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
/* 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, code, mb_type, motion_type;
|
|
|
|
|
|
|
|
/* skip mb handling */
|
|
|
|
if (s->mb_incr == 0) {
|
|
|
|
/* read again increment */
|
|
|
|
s->mb_incr = 1;
|
|
|
|
for(;;) {
|
|
|
|
code = get_vlc(&s->gb, &mbincr_vlc);
|
|
|
|
if (code < 0)
|
|
|
|
return 1; /* error = end of slice */
|
|
|
|
if (code >= 33) {
|
|
|
|
if (code == 33) {
|
|
|
|
s->mb_incr += 33;
|
|
|
|
}
|
|
|
|
/* otherwise, stuffing, nothing to do */
|
|
|
|
} else {
|
|
|
|
s->mb_incr += code;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (++s->mb_x >= s->mb_width) {
|
|
|
|
s->mb_x = 0;
|
|
|
|
if (s->mb_y >= (s->mb_height - 1))
|
|
|
|
return -1;
|
|
|
|
s->mb_y++;
|
|
|
|
}
|
|
|
|
dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
|
|
|
|
|
|
|
|
if (--s->mb_incr != 0) {
|
|
|
|
/* 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;
|
2001-08-12 00:52:01 +00:00
|
|
|
s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
|
2001-07-22 14:18:56 +00:00
|
|
|
} 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];
|
|
|
|
}
|
2001-07-24 20:43:41 +00:00
|
|
|
s->mb_skiped = 1;
|
2001-07-22 14:18:56 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch(s->pict_type) {
|
|
|
|
default:
|
|
|
|
case I_TYPE:
|
2001-08-04 00:46:50 +00:00
|
|
|
if (get_bits1(&s->gb) == 0) {
|
|
|
|
if (get_bits1(&s->gb) == 0)
|
2001-07-22 14:18:56 +00:00
|
|
|
return -1;
|
|
|
|
mb_type = MB_QUANT | MB_INTRA;
|
|
|
|
} else {
|
|
|
|
mb_type = MB_INTRA;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
case P_TYPE:
|
|
|
|
mb_type = get_vlc(&s->gb, &mb_ptype_vlc);
|
|
|
|
if (mb_type < 0)
|
|
|
|
return -1;
|
|
|
|
break;
|
|
|
|
case B_TYPE:
|
|
|
|
mb_type = get_vlc(&s->gb, &mb_btype_vlc);
|
|
|
|
if (mb_type < 0)
|
|
|
|
return -1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
dprintf("mb_type=%x\n", mb_type);
|
|
|
|
motion_type = 0; /* avoid warning */
|
|
|
|
if (mb_type & (MB_FOR|MB_BACK)) {
|
|
|
|
/* get additionnal motion vector type */
|
|
|
|
if (s->picture_structure == PICT_FRAME && 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 &&
|
|
|
|
!s->frame_pred_frame_dct &&
|
|
|
|
(mb_type & (MB_PAT | MB_INTRA))) {
|
2001-08-04 00:46:50 +00:00
|
|
|
s->interlaced_dct = get_bits1(&s->gb);
|
2001-07-22 14:18:56 +00:00
|
|
|
#ifdef DEBUG
|
|
|
|
if (s->interlaced_dct)
|
|
|
|
printf("interlaced_dct\n");
|
|
|
|
#endif
|
|
|
|
} else {
|
|
|
|
s->interlaced_dct = 0; /* frame based */
|
|
|
|
}
|
|
|
|
|
|
|
|
if (mb_type & MB_QUANT) {
|
2001-08-11 19:04:08 +00:00
|
|
|
s->qscale = get_qscale(s);
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
if (mb_type & MB_INTRA) {
|
|
|
|
if (s->concealment_motion_vectors) {
|
|
|
|
/* just parse them */
|
|
|
|
if (s->picture_structure != PICT_FRAME)
|
2001-08-04 00:46:50 +00:00
|
|
|
skip_bits1(&s->gb); /* field select */
|
2001-07-22 14:18:56 +00:00
|
|
|
mpeg_decode_motion(s, s->mpeg_f_code[0][0], 0);
|
|
|
|
mpeg_decode_motion(s, s->mpeg_f_code[0][1], 0);
|
|
|
|
}
|
|
|
|
s->mb_intra = 1;
|
|
|
|
cbp = 0x3f;
|
|
|
|
memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
|
|
|
|
} else {
|
|
|
|
s->mb_intra = 0;
|
|
|
|
cbp = 0;
|
|
|
|
}
|
|
|
|
/* special case of implicit zero motion vector */
|
|
|
|
if (s->pict_type == P_TYPE && !(mb_type & MB_FOR)) {
|
|
|
|
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;
|
2001-08-11 22:08:23 +00:00
|
|
|
s->last_mv[0][1][0] = 0;
|
|
|
|
s->last_mv[0][1][1] = 0;
|
2001-07-22 14:18:56 +00:00
|
|
|
s->mv[0][0][0] = 0;
|
|
|
|
s->mv[0][0][1] = 0;
|
|
|
|
} else if (mb_type & (MB_FOR | MB_BACK)) {
|
|
|
|
/* motion vectors */
|
|
|
|
s->mv_dir = 0;
|
|
|
|
for(i=0;i<2;i++) {
|
|
|
|
if (mb_type & (MB_FOR >> i)) {
|
|
|
|
s->mv_dir |= (MV_DIR_FORWARD >> i);
|
2001-08-11 22:08:23 +00:00
|
|
|
dprintf("motion_type=%d\n", motion_type);
|
2001-07-22 14:18:56 +00:00
|
|
|
switch(motion_type) {
|
|
|
|
case MT_FRAME: /* or MT_16X8 */
|
|
|
|
if (s->picture_structure == PICT_FRAME) {
|
|
|
|
/* MT_FRAME */
|
|
|
|
s->mv_type = MV_TYPE_16X16;
|
|
|
|
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;
|
|
|
|
/* full_pel: only for mpeg1 */
|
|
|
|
if (s->full_pel[i])
|
|
|
|
val = val << 1;
|
|
|
|
s->mv[i][0][k] = val;
|
|
|
|
dprintf("mv%d: %d\n", k, val);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* MT_16X8 */
|
|
|
|
s->mv_type = MV_TYPE_16X8;
|
|
|
|
for(j=0;j<2;j++) {
|
2001-08-04 00:46:50 +00:00
|
|
|
s->field_select[i][j] = get_bits1(&s->gb);
|
2001-07-22 14:18:56 +00:00
|
|
|
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:
|
|
|
|
if (s->picture_structure == PICT_FRAME) {
|
|
|
|
s->mv_type = MV_TYPE_FIELD;
|
|
|
|
for(j=0;j<2;j++) {
|
2001-08-04 00:46:50 +00:00
|
|
|
s->field_select[i][j] = get_bits1(&s->gb);
|
2001-07-22 14:18:56 +00:00
|
|
|
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 {
|
|
|
|
s->mv_type = MV_TYPE_16X16;
|
2001-08-04 00:46:50 +00:00
|
|
|
s->field_select[i][0] = get_bits1(&s->gb);
|
2001-07-22 14:18:56 +00:00
|
|
|
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) {
|
|
|
|
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 {
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((mb_type & MB_INTRA) && s->concealment_motion_vectors) {
|
2001-08-04 00:46:50 +00:00
|
|
|
skip_bits1(&s->gb); /* marker */
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
if (mb_type & MB_PAT) {
|
|
|
|
cbp = get_vlc(&s->gb, &mb_pat_vlc);
|
|
|
|
if (cbp < 0)
|
|
|
|
return -1;
|
|
|
|
cbp++;
|
|
|
|
}
|
|
|
|
dprintf("cbp=%x\n", cbp);
|
|
|
|
|
|
|
|
if (s->mpeg2) {
|
|
|
|
if (s->mb_intra) {
|
|
|
|
for(i=0;i<6;i++) {
|
|
|
|
if (cbp & (1 << (5 - i))) {
|
|
|
|
if (mpeg2_decode_block_intra(s, block[i], i) < 0)
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
for(i=0;i<6;i++) {
|
|
|
|
if (cbp & (1 << (5 - i))) {
|
|
|
|
if (mpeg2_decode_block_non_intra(s, block[i], i) < 0)
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
for(i=0;i<6;i++) {
|
|
|
|
if (cbp & (1 << (5 - i))) {
|
|
|
|
if (mpeg1_decode_block(s, block[i], i) < 0)
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
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_vlc(&s->gb, &mv_vlc);
|
|
|
|
if (code < 0) {
|
|
|
|
return 0xffff;
|
|
|
|
}
|
|
|
|
if (code == 0) {
|
|
|
|
return pred;
|
|
|
|
}
|
2001-08-04 00:46:50 +00:00
|
|
|
sign = get_bits1(&s->gb);
|
2001-07-22 14:18:56 +00:00
|
|
|
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) * 16;
|
|
|
|
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_vlc(&s->gb, &dc_lum_vlc);
|
|
|
|
} else {
|
|
|
|
code = get_vlc(&s->gb, &dc_chroma_vlc);
|
|
|
|
}
|
|
|
|
if (code < 0)
|
|
|
|
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 int mpeg1_decode_block(MpegEncContext *s,
|
|
|
|
DCTELEM *block,
|
|
|
|
int n)
|
|
|
|
{
|
|
|
|
int level, dc, diff, i, j, run;
|
|
|
|
int code, component;
|
|
|
|
RLTable *rl = &rl_mpeg1;
|
|
|
|
|
|
|
|
if (s->mb_intra) {
|
|
|
|
/* 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;
|
|
|
|
dprintf("dc=%d diff=%d\n", dc, diff);
|
|
|
|
i = 1;
|
|
|
|
} else {
|
|
|
|
int bit_cnt, v;
|
|
|
|
UINT32 bit_buf;
|
|
|
|
UINT8 *buf_ptr;
|
|
|
|
i = 0;
|
|
|
|
/* special case for the first coef. no need to add a second vlc table */
|
|
|
|
SAVE_BITS(&s->gb);
|
|
|
|
SHOW_BITS(&s->gb, v, 2);
|
|
|
|
if (v & 2) {
|
|
|
|
run = 0;
|
|
|
|
level = 1 - ((v & 1) << 1);
|
|
|
|
FLUSH_BITS(2);
|
|
|
|
RESTORE_BITS(&s->gb);
|
|
|
|
goto add_coef;
|
|
|
|
}
|
|
|
|
RESTORE_BITS(&s->gb);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* now quantify & encode AC coefs */
|
|
|
|
for(;;) {
|
|
|
|
code = get_vlc(&s->gb, &rl->vlc);
|
|
|
|
if (code < 0) {
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
if (code == 112) {
|
|
|
|
break;
|
|
|
|
} else if (code == 111) {
|
|
|
|
/* escape */
|
|
|
|
run = get_bits(&s->gb, 6);
|
|
|
|
level = get_bits(&s->gb, 8);
|
|
|
|
level = (level << 24) >> 24;
|
|
|
|
if (level == -128) {
|
|
|
|
level = get_bits(&s->gb, 8) - 256;
|
|
|
|
} else if (level == 0) {
|
|
|
|
level = get_bits(&s->gb, 8);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
run = rl->table_run[code];
|
|
|
|
level = rl->table_level[code];
|
2001-08-04 00:46:50 +00:00
|
|
|
if (get_bits1(&s->gb))
|
2001-07-22 14:18:56 +00:00
|
|
|
level = -level;
|
|
|
|
}
|
|
|
|
i += run;
|
|
|
|
if (i >= 64)
|
|
|
|
return -1;
|
|
|
|
add_coef:
|
|
|
|
dprintf("%d: run=%d level=%d\n", n, run, level);
|
|
|
|
j = zigzag_direct[i];
|
|
|
|
block[j] = level;
|
|
|
|
i++;
|
|
|
|
}
|
2002-02-18 00:31:16 +00:00
|
|
|
s->block_last_index[n] = i-1;
|
2001-07-22 14:18:56 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Also does unquantization here, since I will never support mpeg2
|
|
|
|
encoding */
|
|
|
|
static int mpeg2_decode_block_non_intra(MpegEncContext *s,
|
|
|
|
DCTELEM *block,
|
|
|
|
int n)
|
|
|
|
{
|
|
|
|
int level, i, j, run;
|
|
|
|
int code;
|
|
|
|
RLTable *rl = &rl_mpeg1;
|
|
|
|
const UINT8 *scan_table;
|
|
|
|
const UINT16 *matrix;
|
|
|
|
int mismatch;
|
|
|
|
|
|
|
|
if (s->alternate_scan)
|
|
|
|
scan_table = ff_alternate_vertical_scan;
|
|
|
|
else
|
|
|
|
scan_table = zigzag_direct;
|
|
|
|
mismatch = 1;
|
|
|
|
|
|
|
|
{
|
|
|
|
int bit_cnt, v;
|
|
|
|
UINT32 bit_buf;
|
|
|
|
UINT8 *buf_ptr;
|
|
|
|
i = 0;
|
|
|
|
if (n < 4)
|
|
|
|
matrix = s->non_intra_matrix;
|
|
|
|
else
|
|
|
|
matrix = s->chroma_non_intra_matrix;
|
|
|
|
|
|
|
|
/* special case for the first coef. no need to add a second vlc table */
|
|
|
|
SAVE_BITS(&s->gb);
|
|
|
|
SHOW_BITS(&s->gb, v, 2);
|
|
|
|
if (v & 2) {
|
|
|
|
run = 0;
|
|
|
|
level = 1 - ((v & 1) << 1);
|
|
|
|
FLUSH_BITS(2);
|
|
|
|
RESTORE_BITS(&s->gb);
|
|
|
|
goto add_coef;
|
|
|
|
}
|
|
|
|
RESTORE_BITS(&s->gb);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* now quantify & encode AC coefs */
|
|
|
|
for(;;) {
|
|
|
|
code = get_vlc(&s->gb, &rl->vlc);
|
|
|
|
if (code < 0)
|
|
|
|
return -1;
|
|
|
|
if (code == 112) {
|
|
|
|
break;
|
|
|
|
} else if (code == 111) {
|
|
|
|
/* escape */
|
|
|
|
run = get_bits(&s->gb, 6);
|
|
|
|
level = get_bits(&s->gb, 12);
|
|
|
|
level = (level << 20) >> 20;
|
|
|
|
} else {
|
|
|
|
run = rl->table_run[code];
|
|
|
|
level = rl->table_level[code];
|
2001-08-04 00:46:50 +00:00
|
|
|
if (get_bits1(&s->gb))
|
2001-07-22 14:18:56 +00:00
|
|
|
level = -level;
|
|
|
|
}
|
|
|
|
i += run;
|
|
|
|
if (i >= 64)
|
|
|
|
return -1;
|
|
|
|
add_coef:
|
|
|
|
j = scan_table[i];
|
|
|
|
dprintf("%d: run=%d level=%d\n", n, run, level);
|
2001-08-12 00:52:01 +00:00
|
|
|
/* XXX: optimize */
|
|
|
|
if (level > 0) {
|
|
|
|
level = ((level * 2 + 1) * s->qscale * matrix[j]) >> 5;
|
|
|
|
} else {
|
|
|
|
level = ((-level * 2 + 1) * s->qscale * matrix[j]) >> 5;
|
|
|
|
level = -level;
|
|
|
|
}
|
2001-07-22 14:18:56 +00:00
|
|
|
/* XXX: is it really necessary to saturate since the encoder
|
|
|
|
knows whats going on ? */
|
|
|
|
mismatch ^= level;
|
|
|
|
block[j] = level;
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
block[63] ^= (mismatch & 1);
|
|
|
|
s->block_last_index[n] = i;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mpeg2_decode_block_intra(MpegEncContext *s,
|
|
|
|
DCTELEM *block,
|
|
|
|
int n)
|
|
|
|
{
|
|
|
|
int level, dc, diff, i, j, run;
|
|
|
|
int code, component;
|
|
|
|
RLTable *rl;
|
|
|
|
const UINT8 *scan_table;
|
|
|
|
const UINT16 *matrix;
|
|
|
|
int mismatch;
|
|
|
|
|
|
|
|
if (s->alternate_scan)
|
|
|
|
scan_table = ff_alternate_vertical_scan;
|
|
|
|
else
|
|
|
|
scan_table = zigzag_direct;
|
|
|
|
|
|
|
|
/* 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 - s->intra_dc_precision);
|
|
|
|
dprintf("dc=%d\n", block[0]);
|
2001-08-11 22:08:23 +00:00
|
|
|
mismatch = block[0] ^ 1;
|
2001-07-22 14:18:56 +00:00
|
|
|
i = 1;
|
|
|
|
if (s->intra_vlc_format)
|
|
|
|
rl = &rl_mpeg2;
|
|
|
|
else
|
|
|
|
rl = &rl_mpeg1;
|
|
|
|
if (n < 4)
|
|
|
|
matrix = s->intra_matrix;
|
|
|
|
else
|
|
|
|
matrix = s->chroma_intra_matrix;
|
2001-08-12 00:52:01 +00:00
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
/* now quantify & encode AC coefs */
|
|
|
|
for(;;) {
|
|
|
|
code = get_vlc(&s->gb, &rl->vlc);
|
|
|
|
if (code < 0)
|
|
|
|
return -1;
|
|
|
|
if (code == 112) {
|
|
|
|
break;
|
|
|
|
} else if (code == 111) {
|
|
|
|
/* escape */
|
|
|
|
run = get_bits(&s->gb, 6);
|
|
|
|
level = get_bits(&s->gb, 12);
|
|
|
|
level = (level << 20) >> 20;
|
|
|
|
} else {
|
|
|
|
run = rl->table_run[code];
|
|
|
|
level = rl->table_level[code];
|
2001-08-04 00:46:50 +00:00
|
|
|
if (get_bits1(&s->gb))
|
2001-07-22 14:18:56 +00:00
|
|
|
level = -level;
|
|
|
|
}
|
|
|
|
i += run;
|
|
|
|
if (i >= 64)
|
|
|
|
return -1;
|
|
|
|
j = scan_table[i];
|
|
|
|
dprintf("%d: run=%d level=%d\n", n, run, level);
|
|
|
|
level = (level * s->qscale * matrix[j]) / 16;
|
|
|
|
/* XXX: is it really necessary to saturate since the encoder
|
|
|
|
knows whats going on ? */
|
|
|
|
mismatch ^= level;
|
|
|
|
block[j] = level;
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
block[63] ^= (mismatch & 1);
|
|
|
|
s->block_last_index[n] = i;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* compressed picture size */
|
|
|
|
#define PICTURE_BUFFER_SIZE 100000
|
|
|
|
|
|
|
|
typedef struct Mpeg1Context {
|
|
|
|
MpegEncContext mpeg_enc_ctx;
|
|
|
|
UINT32 header_state;
|
|
|
|
int start_code; /* current start code */
|
|
|
|
UINT8 buffer[PICTURE_BUFFER_SIZE];
|
|
|
|
UINT8 *buf_ptr;
|
|
|
|
int buffer_size;
|
|
|
|
int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
|
2002-03-16 02:41:00 +00:00
|
|
|
int repeat_field; /* true if we must repeat the field */
|
2001-07-22 14:18:56 +00:00
|
|
|
} Mpeg1Context;
|
|
|
|
|
|
|
|
static int mpeg_decode_init(AVCodecContext *avctx)
|
|
|
|
{
|
|
|
|
Mpeg1Context *s = avctx->priv_data;
|
|
|
|
|
|
|
|
s->header_state = 0xff;
|
|
|
|
s->mpeg_enc_ctx_allocated = 0;
|
|
|
|
s->buffer_size = PICTURE_BUFFER_SIZE;
|
|
|
|
s->start_code = -1;
|
|
|
|
s->buf_ptr = s->buffer;
|
|
|
|
s->mpeg_enc_ctx.picture_number = 0;
|
2002-03-16 02:41:00 +00:00
|
|
|
s->repeat_field = 0;
|
2001-07-22 14:18:56 +00:00
|
|
|
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 **pbuf_ptr, UINT8 *buf_end,
|
|
|
|
UINT32 *header_state)
|
|
|
|
{
|
|
|
|
UINT8 *buf_ptr;
|
|
|
|
unsigned int state, v;
|
|
|
|
int val;
|
|
|
|
|
|
|
|
state = *header_state;
|
|
|
|
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;
|
|
|
|
*header_state = state;
|
|
|
|
return val;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mpeg1_decode_picture(AVCodecContext *avctx,
|
|
|
|
UINT8 *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);
|
|
|
|
|
|
|
|
ref = get_bits(&s->gb, 10); /* temporal ref */
|
|
|
|
s->pict_type = get_bits(&s->gb, 3);
|
2001-08-08 21:53:28 +00:00
|
|
|
dprintf("pict_type=%d number=%d\n", s->pict_type, s->picture_number);
|
2001-08-04 00:46:50 +00:00
|
|
|
skip_bits(&s->gb, 16);
|
2001-07-22 14:18:56 +00:00
|
|
|
if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) {
|
2001-08-04 00:46:50 +00:00
|
|
|
s->full_pel[0] = get_bits1(&s->gb);
|
2001-07-22 14:18:56 +00:00
|
|
|
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) {
|
2001-08-04 00:46:50 +00:00
|
|
|
s->full_pel[1] = get_bits1(&s->gb);
|
2001-07-22 14:18:56 +00:00
|
|
|
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->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, low_delay;
|
|
|
|
int frame_rate_ext_n, frame_rate_ext_d;
|
|
|
|
|
2001-08-04 00:46:50 +00:00
|
|
|
skip_bits(&s->gb, 8); /* profil and level */
|
2002-03-16 02:41:00 +00:00
|
|
|
s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
|
2001-08-04 00:46:50 +00:00
|
|
|
skip_bits(&s->gb, 2); /* chroma_format */
|
2001-07-22 14:18:56 +00:00
|
|
|
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;
|
2001-08-04 00:46:50 +00:00
|
|
|
skip_bits1(&s->gb); /* marker */
|
2001-07-22 14:18:56 +00:00
|
|
|
vbv_buf_ext = get_bits(&s->gb, 8);
|
2001-08-04 00:46:50 +00:00
|
|
|
low_delay = get_bits1(&s->gb);
|
2001-07-22 14:18:56 +00:00
|
|
|
frame_rate_ext_n = get_bits(&s->gb, 2);
|
|
|
|
frame_rate_ext_d = get_bits(&s->gb, 5);
|
|
|
|
if (frame_rate_ext_d >= 1)
|
|
|
|
s->frame_rate = (s->frame_rate * frame_rate_ext_n) / frame_rate_ext_d;
|
|
|
|
dprintf("sequence extension\n");
|
|
|
|
s->mpeg2 = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
|
|
|
|
{
|
2001-08-07 22:47:08 +00:00
|
|
|
int i, v, j;
|
2001-07-22 14:18:56 +00:00
|
|
|
|
2001-08-12 00:52:01 +00:00
|
|
|
dprintf("matrix extension\n");
|
|
|
|
|
2001-08-04 00:46:50 +00:00
|
|
|
if (get_bits1(&s->gb)) {
|
2001-07-22 14:18:56 +00:00
|
|
|
for(i=0;i<64;i++) {
|
|
|
|
v = get_bits(&s->gb, 8);
|
2001-08-12 00:52:01 +00:00
|
|
|
j = zigzag_direct[i];
|
2001-08-07 22:47:08 +00:00
|
|
|
s->intra_matrix[j] = v;
|
|
|
|
s->chroma_intra_matrix[j] = v;
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
}
|
2001-08-04 00:46:50 +00:00
|
|
|
if (get_bits1(&s->gb)) {
|
2001-07-22 14:18:56 +00:00
|
|
|
for(i=0;i<64;i++) {
|
|
|
|
v = get_bits(&s->gb, 8);
|
2001-08-12 00:52:01 +00:00
|
|
|
j = zigzag_direct[i];
|
2001-08-07 22:47:08 +00:00
|
|
|
s->non_intra_matrix[j] = v;
|
|
|
|
s->chroma_non_intra_matrix[j] = v;
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
}
|
2001-08-04 00:46:50 +00:00
|
|
|
if (get_bits1(&s->gb)) {
|
2001-07-22 14:18:56 +00:00
|
|
|
for(i=0;i<64;i++) {
|
|
|
|
v = get_bits(&s->gb, 8);
|
2001-08-12 00:52:01 +00:00
|
|
|
j = zigzag_direct[i];
|
2001-08-07 22:47:08 +00:00
|
|
|
s->chroma_intra_matrix[j] = v;
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
}
|
2001-08-04 00:46:50 +00:00
|
|
|
if (get_bits1(&s->gb)) {
|
2001-07-22 14:18:56 +00:00
|
|
|
for(i=0;i<64;i++) {
|
|
|
|
v = get_bits(&s->gb, 8);
|
2001-08-12 00:52:01 +00:00
|
|
|
j = zigzag_direct[i];
|
2001-08-07 22:47:08 +00:00
|
|
|
s->chroma_non_intra_matrix[j] = v;
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
2001-08-04 00:46:50 +00:00
|
|
|
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);
|
2001-07-22 14:18:56 +00:00
|
|
|
/* composite display not parsed */
|
2002-03-16 02:41:00 +00:00
|
|
|
dprintf("intra_dc_precision=%d\n", s->intra_dc_precision);
|
2001-08-12 00:52:01 +00:00
|
|
|
dprintf("picture_structure=%d\n", s->picture_structure);
|
2001-07-22 14:18:56 +00:00
|
|
|
dprintf("conceal=%d\n", s->concealment_motion_vectors);
|
2001-08-12 00:52:01 +00:00
|
|
|
dprintf("intra_vlc_format=%d\n", s->intra_vlc_format);
|
|
|
|
dprintf("alternate_scan=%d\n", s->alternate_scan);
|
2001-07-22 14:18:56 +00:00
|
|
|
dprintf("frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
|
2002-03-16 02:41:00 +00:00
|
|
|
dprintf("progressive_frame=%d\n", s->progressive_frame);
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void mpeg_decode_extension(AVCodecContext *avctx,
|
|
|
|
UINT8 *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);
|
|
|
|
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* return 1 if end of frame */
|
|
|
|
static int mpeg_decode_slice(AVCodecContext *avctx,
|
|
|
|
AVPicture *pict,
|
|
|
|
int start_code,
|
|
|
|
UINT8 *buf, int buf_size)
|
|
|
|
{
|
|
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
start_code = (start_code - 1) & 0xff;
|
|
|
|
if (start_code >= s->mb_height)
|
|
|
|
return -1;
|
|
|
|
s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
|
|
|
|
s->last_dc[1] = s->last_dc[0];
|
|
|
|
s->last_dc[2] = s->last_dc[0];
|
|
|
|
memset(s->last_mv, 0, sizeof(s->last_mv));
|
|
|
|
s->mb_x = -1;
|
|
|
|
s->mb_y = start_code;
|
|
|
|
s->mb_incr = 0;
|
|
|
|
|
|
|
|
/* start frame decoding */
|
|
|
|
if (s->first_slice) {
|
|
|
|
s->first_slice = 0;
|
|
|
|
MPV_frame_start(s);
|
|
|
|
}
|
|
|
|
|
|
|
|
init_get_bits(&s->gb, buf, buf_size);
|
|
|
|
|
2001-08-11 19:04:08 +00:00
|
|
|
s->qscale = get_qscale(s);
|
2001-07-22 14:18:56 +00:00
|
|
|
/* extra slice info */
|
2001-08-04 00:46:50 +00:00
|
|
|
while (get_bits1(&s->gb) != 0) {
|
|
|
|
skip_bits(&s->gb, 8);
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
for(;;) {
|
2002-03-28 13:41:04 +00:00
|
|
|
clear_blocks(s->block[0]);
|
2002-04-07 21:44:29 +00:00
|
|
|
emms_c();
|
2001-07-30 23:24:58 +00:00
|
|
|
ret = mpeg_decode_mb(s, s->block);
|
2001-07-22 14:18:56 +00:00
|
|
|
dprintf("ret=%d\n", ret);
|
|
|
|
if (ret < 0)
|
|
|
|
return -1;
|
|
|
|
if (ret == 1)
|
|
|
|
break;
|
2001-07-30 23:24:58 +00:00
|
|
|
MPV_decode_mb(s, s->block);
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
2002-04-04 19:50:46 +00:00
|
|
|
emms_c();
|
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
/* end of slice reached */
|
|
|
|
if (s->mb_x == (s->mb_width - 1) &&
|
|
|
|
s->mb_y == (s->mb_height - 1)) {
|
|
|
|
/* end of image */
|
|
|
|
UINT8 **picture;
|
|
|
|
|
|
|
|
MPV_frame_end(s);
|
|
|
|
|
|
|
|
/* XXX: incorrect reported qscale for mpeg2 */
|
|
|
|
if (s->pict_type == B_TYPE) {
|
|
|
|
picture = s->current_picture;
|
|
|
|
avctx->quality = s->qscale;
|
|
|
|
} else {
|
|
|
|
/* latency of 1 frame for I and P frames */
|
|
|
|
/* XXX: use another variable than picture_number */
|
|
|
|
if (s->picture_number == 0) {
|
|
|
|
picture = NULL;
|
|
|
|
} else {
|
|
|
|
picture = s->last_picture;
|
|
|
|
avctx->quality = s->last_qscale;
|
|
|
|
}
|
|
|
|
s->last_qscale = s->qscale;
|
|
|
|
s->picture_number++;
|
|
|
|
}
|
|
|
|
if (picture) {
|
|
|
|
pict->data[0] = picture[0];
|
|
|
|
pict->data[1] = picture[1];
|
|
|
|
pict->data[2] = picture[2];
|
|
|
|
pict->linesize[0] = s->linesize;
|
|
|
|
pict->linesize[1] = s->linesize / 2;
|
|
|
|
pict->linesize[2] = s->linesize / 2;
|
|
|
|
return 1;
|
|
|
|
} else {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int mpeg1_decode_sequence(AVCodecContext *avctx,
|
|
|
|
UINT8 *buf, int buf_size)
|
|
|
|
{
|
|
|
|
Mpeg1Context *s1 = avctx->priv_data;
|
|
|
|
MpegEncContext *s = &s1->mpeg_enc_ctx;
|
2001-08-07 22:47:08 +00:00
|
|
|
int width, height, i, v, j;
|
2001-07-22 14:18:56 +00:00
|
|
|
|
|
|
|
init_get_bits(&s->gb, buf, buf_size);
|
|
|
|
|
|
|
|
width = get_bits(&s->gb, 12);
|
|
|
|
height = get_bits(&s->gb, 12);
|
2001-08-04 00:46:50 +00:00
|
|
|
skip_bits(&s->gb, 4);
|
2001-07-22 14:18:56 +00:00
|
|
|
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;
|
2001-08-04 00:46:50 +00:00
|
|
|
if (get_bits1(&s->gb) == 0) /* marker */
|
2001-07-22 14:18:56 +00:00
|
|
|
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;
|
|
|
|
s->has_b_frames = 1;
|
2001-08-15 13:11:03 +00:00
|
|
|
s->avctx = avctx;
|
2001-07-22 14:18:56 +00:00
|
|
|
avctx->width = width;
|
|
|
|
avctx->height = height;
|
|
|
|
avctx->frame_rate = frame_rate_tab[s->frame_rate_index];
|
2002-03-16 02:41:00 +00:00
|
|
|
s->frame_rate = avctx->frame_rate;
|
2001-07-22 14:18:56 +00:00
|
|
|
avctx->bit_rate = s->bit_rate;
|
|
|
|
|
|
|
|
if (MPV_common_init(s) < 0)
|
|
|
|
return -1;
|
|
|
|
mpeg1_init_vlc(s);
|
|
|
|
s1->mpeg_enc_ctx_allocated = 1;
|
|
|
|
}
|
|
|
|
|
2001-08-04 00:46:50 +00:00
|
|
|
skip_bits(&s->gb, 10); /* vbv_buffer_size */
|
|
|
|
skip_bits(&s->gb, 1);
|
2001-07-22 14:18:56 +00:00
|
|
|
|
|
|
|
/* get matrix */
|
2001-08-04 00:46:50 +00:00
|
|
|
if (get_bits1(&s->gb)) {
|
2001-07-22 14:18:56 +00:00
|
|
|
for(i=0;i<64;i++) {
|
|
|
|
v = get_bits(&s->gb, 8);
|
2001-08-12 00:52:01 +00:00
|
|
|
j = zigzag_direct[i];
|
2001-08-07 22:47:08 +00:00
|
|
|
s->intra_matrix[j] = v;
|
|
|
|
s->chroma_intra_matrix[j] = v;
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
2001-08-12 00:52:01 +00:00
|
|
|
#ifdef DEBUG
|
|
|
|
dprintf("intra matrix present\n");
|
|
|
|
for(i=0;i<64;i++)
|
|
|
|
dprintf(" %d", s->intra_matrix[zigzag_direct[i]]);
|
|
|
|
printf("\n");
|
|
|
|
#endif
|
2001-07-22 14:18:56 +00:00
|
|
|
} else {
|
|
|
|
for(i=0;i<64;i++) {
|
|
|
|
v = default_intra_matrix[i];
|
|
|
|
s->intra_matrix[i] = v;
|
|
|
|
s->chroma_intra_matrix[i] = v;
|
|
|
|
}
|
|
|
|
}
|
2001-08-04 00:46:50 +00:00
|
|
|
if (get_bits1(&s->gb)) {
|
2001-07-22 14:18:56 +00:00
|
|
|
for(i=0;i<64;i++) {
|
|
|
|
v = get_bits(&s->gb, 8);
|
2001-08-12 00:52:01 +00:00
|
|
|
j = zigzag_direct[i];
|
2001-08-07 22:47:08 +00:00
|
|
|
s->non_intra_matrix[j] = v;
|
|
|
|
s->chroma_non_intra_matrix[j] = v;
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
2001-08-12 00:52:01 +00:00
|
|
|
#ifdef DEBUG
|
|
|
|
dprintf("non intra matrix present\n");
|
|
|
|
for(i=0;i<64;i++)
|
|
|
|
dprintf(" %d", s->non_intra_matrix[zigzag_direct[i]]);
|
|
|
|
printf("\n");
|
|
|
|
#endif
|
2001-07-22 14:18:56 +00:00
|
|
|
} else {
|
|
|
|
for(i=0;i<64;i++) {
|
|
|
|
v = default_non_intra_matrix[i];
|
|
|
|
s->non_intra_matrix[i] = v;
|
|
|
|
s->chroma_non_intra_matrix[i] = 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;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* handle buffering and image synchronisation */
|
|
|
|
static int mpeg_decode_frame(AVCodecContext *avctx,
|
|
|
|
void *data, int *data_size,
|
|
|
|
UINT8 *buf, int buf_size)
|
|
|
|
{
|
|
|
|
Mpeg1Context *s = avctx->priv_data;
|
|
|
|
UINT8 *buf_end, *buf_ptr, *buf_start;
|
|
|
|
int len, start_code_found, ret, code, start_code, input_size;
|
|
|
|
AVPicture *picture = data;
|
2002-03-16 02:41:00 +00:00
|
|
|
MpegEncContext *s2 = &s->mpeg_enc_ctx;
|
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
dprintf("fill_buffer\n");
|
|
|
|
|
|
|
|
*data_size = 0;
|
2002-03-16 02:41:00 +00:00
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
/* special case for last picture */
|
|
|
|
if (buf_size == 0) {
|
|
|
|
if (s2->picture_number > 0) {
|
|
|
|
picture->data[0] = s2->next_picture[0];
|
|
|
|
picture->data[1] = s2->next_picture[1];
|
|
|
|
picture->data[2] = s2->next_picture[2];
|
|
|
|
picture->linesize[0] = s2->linesize;
|
|
|
|
picture->linesize[1] = s2->linesize / 2;
|
|
|
|
picture->linesize[2] = s2->linesize / 2;
|
|
|
|
*data_size = sizeof(AVPicture);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
buf_ptr = buf;
|
|
|
|
buf_end = buf + buf_size;
|
2002-03-16 02:41:00 +00:00
|
|
|
|
|
|
|
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);
|
2002-03-19 06:30:41 +00:00
|
|
|
*data_size = sizeof(AVPicture);
|
2002-03-16 02:41:00 +00:00
|
|
|
goto the_end;
|
|
|
|
}
|
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
while (buf_ptr < buf_end) {
|
|
|
|
buf_start = buf_ptr;
|
|
|
|
/* find start next code */
|
|
|
|
code = find_start_code(&buf_ptr, buf_end, &s->header_state);
|
|
|
|
if (code >= 0) {
|
|
|
|
start_code_found = 1;
|
|
|
|
} else {
|
|
|
|
start_code_found = 0;
|
|
|
|
}
|
|
|
|
/* copy to buffer */
|
|
|
|
len = buf_ptr - buf_start;
|
|
|
|
if (len + (s->buf_ptr - s->buffer) > s->buffer_size) {
|
|
|
|
/* data too big : flush */
|
|
|
|
s->buf_ptr = s->buffer;
|
|
|
|
if (start_code_found)
|
|
|
|
s->start_code = code;
|
|
|
|
} else {
|
|
|
|
memcpy(s->buf_ptr, buf_start, len);
|
|
|
|
s->buf_ptr += len;
|
|
|
|
|
|
|
|
if (start_code_found) {
|
|
|
|
/* prepare data for next start code */
|
|
|
|
input_size = s->buf_ptr - s->buffer;
|
|
|
|
start_code = s->start_code;
|
|
|
|
s->buf_ptr = s->buffer;
|
|
|
|
s->start_code = code;
|
|
|
|
switch(start_code) {
|
|
|
|
case SEQ_START_CODE:
|
|
|
|
mpeg1_decode_sequence(avctx, s->buffer,
|
|
|
|
input_size);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case PICTURE_START_CODE:
|
|
|
|
/* we have a complete image : we try to decompress it */
|
|
|
|
mpeg1_decode_picture(avctx,
|
|
|
|
s->buffer, input_size);
|
|
|
|
break;
|
|
|
|
case EXT_START_CODE:
|
|
|
|
mpeg_decode_extension(avctx,
|
|
|
|
s->buffer, input_size);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
if (start_code >= SLICE_MIN_START_CODE &&
|
|
|
|
start_code <= SLICE_MAX_START_CODE) {
|
|
|
|
ret = mpeg_decode_slice(avctx, picture,
|
|
|
|
start_code, s->buffer, input_size);
|
|
|
|
if (ret == 1) {
|
|
|
|
/* got a picture: exit */
|
2002-03-16 02:41:00 +00:00
|
|
|
/* first check if we must repeat the frame */
|
|
|
|
if (s2->progressive_frame && s2->repeat_first_field) {
|
|
|
|
//fprintf(stderr,"\nRepeat this frame: %d! pict: %d",avctx->frame_number,s2->picture_number);
|
|
|
|
s2->repeat_first_field = 0;
|
|
|
|
s2->progressive_frame = 0;
|
|
|
|
if (++s->repeat_field > 2)
|
|
|
|
s->repeat_field = 0;
|
|
|
|
}
|
2001-07-22 14:18:56 +00:00
|
|
|
*data_size = sizeof(AVPicture);
|
|
|
|
goto the_end;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
the_end:
|
|
|
|
return buf_ptr - buf;
|
|
|
|
}
|
|
|
|
|
|
|
|
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,
|
|
|
|
};
|