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https://git.ffmpeg.org/ffmpeg.git
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d5c62122a7
It is only used in that library.
327 lines
9.9 KiB
C
327 lines
9.9 KiB
C
/*
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* Copyright (c) 2003 Michael Niedermayer
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*
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* This file is part of Libav.
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*
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* Libav 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 2.1 of the License, or (at your option) any later version.
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*
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* Libav 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 Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* ASUS V1/V2 decoder.
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*/
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#include "libavutil/attributes.h"
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#include "libavutil/mem.h"
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#include "asv.h"
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#include "avcodec.h"
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#include "put_bits.h"
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#include "dsputil.h"
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#include "mathops.h"
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#include "mpeg12data.h"
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//#undef NDEBUG
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//#include <assert.h>
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#define VLC_BITS 6
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#define ASV2_LEVEL_VLC_BITS 10
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static VLC ccp_vlc;
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static VLC level_vlc;
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static VLC dc_ccp_vlc;
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static VLC ac_ccp_vlc;
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static VLC asv2_level_vlc;
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static av_cold void init_vlcs(ASV1Context *a){
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static int done = 0;
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if (!done) {
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done = 1;
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INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
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&ff_asv_ccp_tab[0][1], 2, 1,
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&ff_asv_ccp_tab[0][0], 2, 1, 64);
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INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
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&ff_asv_dc_ccp_tab[0][1], 2, 1,
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&ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
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INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
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&ff_asv_ac_ccp_tab[0][1], 2, 1,
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&ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
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INIT_VLC_STATIC(&level_vlc, VLC_BITS, 7,
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&ff_asv_level_tab[0][1], 2, 1,
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&ff_asv_level_tab[0][0], 2, 1, 64);
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INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
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&ff_asv2_level_tab[0][1], 2, 1,
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&ff_asv2_level_tab[0][0], 2, 1, 1024);
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}
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}
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//FIXME write a reversed bitstream reader to avoid the double reverse
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static inline int asv2_get_bits(GetBitContext *gb, int n){
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return ff_reverse[ get_bits(gb, n) << (8-n) ];
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}
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static inline int asv1_get_level(GetBitContext *gb){
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int code= get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
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if(code==3) return get_sbits(gb, 8);
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else return code - 3;
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}
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static inline int asv2_get_level(GetBitContext *gb){
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int code= get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
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if(code==31) return (int8_t)asv2_get_bits(gb, 8);
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else return code - 31;
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}
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static inline int asv1_decode_block(ASV1Context *a, DCTELEM block[64]){
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int i;
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block[0]= 8*get_bits(&a->gb, 8);
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for(i=0; i<11; i++){
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const int ccp= get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
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if(ccp){
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if(ccp == 16) break;
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if(ccp < 0 || i>=10){
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av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
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return -1;
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}
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if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
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if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
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if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
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if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
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}
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}
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return 0;
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}
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static inline int asv2_decode_block(ASV1Context *a, DCTELEM block[64]){
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int i, count, ccp;
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count= asv2_get_bits(&a->gb, 4);
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block[0]= 8*asv2_get_bits(&a->gb, 8);
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ccp= get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
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if(ccp){
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if(ccp&4) block[a->scantable.permutated[1]]= (asv2_get_level(&a->gb) * a->intra_matrix[1])>>4;
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if(ccp&2) block[a->scantable.permutated[2]]= (asv2_get_level(&a->gb) * a->intra_matrix[2])>>4;
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if(ccp&1) block[a->scantable.permutated[3]]= (asv2_get_level(&a->gb) * a->intra_matrix[3])>>4;
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}
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for(i=1; i<count+1; i++){
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const int ccp= get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
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if(ccp){
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if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
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if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
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if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
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if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
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}
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}
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return 0;
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}
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static inline int decode_mb(ASV1Context *a, DCTELEM block[6][64]){
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int i;
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a->dsp.clear_blocks(block[0]);
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if(a->avctx->codec_id == AV_CODEC_ID_ASV1){
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for(i=0; i<6; i++){
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if( asv1_decode_block(a, block[i]) < 0)
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return -1;
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}
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}else{
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for(i=0; i<6; i++){
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if( asv2_decode_block(a, block[i]) < 0)
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return -1;
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}
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}
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return 0;
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}
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static inline void idct_put(ASV1Context *a, int mb_x, int mb_y){
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DCTELEM (*block)[64]= a->block;
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int linesize= a->picture.linesize[0];
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uint8_t *dest_y = a->picture.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
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uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
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uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
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a->dsp.idct_put(dest_y , linesize, block[0]);
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a->dsp.idct_put(dest_y + 8, linesize, block[1]);
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a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
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a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
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if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
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a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
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a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
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}
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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ASV1Context * const a = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame * const p= &a->picture;
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int mb_x, mb_y;
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if(p->data[0])
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avctx->release_buffer(avctx, p);
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p->reference= 0;
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if(avctx->get_buffer(avctx, p) < 0){
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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p->pict_type= AV_PICTURE_TYPE_I;
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p->key_frame= 1;
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av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
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buf_size);
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if (!a->bitstream_buffer)
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return AVERROR(ENOMEM);
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if(avctx->codec_id == AV_CODEC_ID_ASV1)
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a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
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else{
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int i;
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for(i=0; i<buf_size; i++)
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a->bitstream_buffer[i]= ff_reverse[ buf[i] ];
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}
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init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
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for(mb_y=0; mb_y<a->mb_height2; mb_y++){
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for(mb_x=0; mb_x<a->mb_width2; mb_x++){
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if( decode_mb(a, a->block) <0)
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return -1;
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idct_put(a, mb_x, mb_y);
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}
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}
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if(a->mb_width2 != a->mb_width){
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mb_x= a->mb_width2;
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for(mb_y=0; mb_y<a->mb_height2; mb_y++){
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if( decode_mb(a, a->block) <0)
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return -1;
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idct_put(a, mb_x, mb_y);
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}
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}
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if(a->mb_height2 != a->mb_height){
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mb_y= a->mb_height2;
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for(mb_x=0; mb_x<a->mb_width; mb_x++){
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if( decode_mb(a, a->block) <0)
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return -1;
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idct_put(a, mb_x, mb_y);
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}
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}
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*picture = a->picture;
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*data_size = sizeof(AVPicture);
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emms_c();
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return (get_bits_count(&a->gb)+31)/32*4;
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}
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static av_cold int decode_init(AVCodecContext *avctx){
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ASV1Context * const a = avctx->priv_data;
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AVFrame *p= &a->picture;
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int i;
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const int scale= avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
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ff_asv_common_init(avctx);
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init_vlcs(a);
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ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_asv_scantab);
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avctx->pix_fmt= AV_PIX_FMT_YUV420P;
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a->inv_qscale= avctx->extradata[0];
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if(a->inv_qscale == 0){
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av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
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if(avctx->codec_id == AV_CODEC_ID_ASV1)
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a->inv_qscale= 6;
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else
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a->inv_qscale= 10;
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}
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for(i=0; i<64; i++){
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int index = ff_asv_scantab[i];
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a->intra_matrix[i]= 64*scale*ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
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}
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p->qstride= a->mb_width;
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p->qscale_table= av_malloc( p->qstride * a->mb_height);
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p->quality= (32*scale + a->inv_qscale/2)/a->inv_qscale;
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memset(p->qscale_table, p->quality, p->qstride*a->mb_height);
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return 0;
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}
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static av_cold int decode_end(AVCodecContext *avctx){
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ASV1Context * const a = avctx->priv_data;
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av_freep(&a->bitstream_buffer);
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av_freep(&a->picture.qscale_table);
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a->bitstream_buffer_size=0;
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if(a->picture.data[0])
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avctx->release_buffer(avctx, &a->picture);
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return 0;
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}
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AVCodec ff_asv1_decoder = {
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.name = "asv1",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_ASV1,
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.priv_data_size = sizeof(ASV1Context),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
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};
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AVCodec ff_asv2_decoder = {
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.name = "asv2",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_ASV2,
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.priv_data_size = sizeof(ASV1Context),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
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};
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