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ffmpeg/libavcodec/asvdec.c

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/*
* Copyright (c) 2003 Michael Niedermayer
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* ASUS V1/V2 decoder.
*/
#include "libavutil/attributes.h"
#include "libavutil/mem.h"
#include "asv.h"
#include "avcodec.h"
#include "put_bits.h"
#include "dsputil.h"
#include "mathops.h"
#include "mpeg12data.h"
#define VLC_BITS 6
#define ASV2_LEVEL_VLC_BITS 10
static VLC ccp_vlc;
static VLC level_vlc;
static VLC dc_ccp_vlc;
static VLC ac_ccp_vlc;
static VLC asv2_level_vlc;
static av_cold void init_vlcs(ASV1Context *a){
static int done = 0;
if (!done) {
done = 1;
INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
&ff_asv_ccp_tab[0][1], 2, 1,
&ff_asv_ccp_tab[0][0], 2, 1, 64);
INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
&ff_asv_dc_ccp_tab[0][1], 2, 1,
&ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
&ff_asv_ac_ccp_tab[0][1], 2, 1,
&ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
INIT_VLC_STATIC(&level_vlc, VLC_BITS, 7,
&ff_asv_level_tab[0][1], 2, 1,
&ff_asv_level_tab[0][0], 2, 1, 64);
INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
&ff_asv2_level_tab[0][1], 2, 1,
&ff_asv2_level_tab[0][0], 2, 1, 1024);
}
}
//FIXME write a reversed bitstream reader to avoid the double reverse
static inline int asv2_get_bits(GetBitContext *gb, int n){
return ff_reverse[ get_bits(gb, n) << (8-n) ];
}
static inline int asv1_get_level(GetBitContext *gb){
int code= get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
if(code==3) return get_sbits(gb, 8);
else return code - 3;
}
static inline int asv2_get_level(GetBitContext *gb){
int code= get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
if(code==31) return (int8_t)asv2_get_bits(gb, 8);
else return code - 31;
}
static inline int asv1_decode_block(ASV1Context *a, DCTELEM block[64]){
int i;
block[0]= 8*get_bits(&a->gb, 8);
for(i=0; i<11; i++){
const int ccp= get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
if(ccp){
if(ccp == 16) break;
if(ccp < 0 || i>=10){
av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
return -1;
}
if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
}
}
return 0;
}
static inline int asv2_decode_block(ASV1Context *a, DCTELEM block[64]){
int i, count, ccp;
count= asv2_get_bits(&a->gb, 4);
block[0]= 8*asv2_get_bits(&a->gb, 8);
ccp= get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
if(ccp){
if(ccp&4) block[a->scantable.permutated[1]]= (asv2_get_level(&a->gb) * a->intra_matrix[1])>>4;
if(ccp&2) block[a->scantable.permutated[2]]= (asv2_get_level(&a->gb) * a->intra_matrix[2])>>4;
if(ccp&1) block[a->scantable.permutated[3]]= (asv2_get_level(&a->gb) * a->intra_matrix[3])>>4;
}
for(i=1; i<count+1; i++){
const int ccp= get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
if(ccp){
if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
}
}
return 0;
}
static inline int decode_mb(ASV1Context *a, DCTELEM block[6][64]){
int i;
a->dsp.clear_blocks(block[0]);
if(a->avctx->codec_id == AV_CODEC_ID_ASV1){
for(i=0; i<6; i++){
if( asv1_decode_block(a, block[i]) < 0)
return -1;
}
}else{
for(i=0; i<6; i++){
if( asv2_decode_block(a, block[i]) < 0)
return -1;
}
}
return 0;
}
static inline void idct_put(ASV1Context *a, int mb_x, int mb_y){
DCTELEM (*block)[64]= a->block;
int linesize= a->picture.linesize[0];
uint8_t *dest_y = a->picture.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
a->dsp.idct_put(dest_y , linesize, block[0]);
a->dsp.idct_put(dest_y + 8, linesize, block[1]);
a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
}
}
static int decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
ASV1Context * const a = avctx->priv_data;
AVFrame *picture = data;
AVFrame * const p= &a->picture;
int mb_x, mb_y;
if(p->data[0])
avctx->release_buffer(avctx, p);
p->reference= 0;
if(avctx->get_buffer(avctx, p) < 0){
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
p->pict_type= AV_PICTURE_TYPE_I;
p->key_frame= 1;
av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
buf_size);
if (!a->bitstream_buffer)
return AVERROR(ENOMEM);
if(avctx->codec_id == AV_CODEC_ID_ASV1)
a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
else{
int i;
for(i=0; i<buf_size; i++)
a->bitstream_buffer[i]= ff_reverse[ buf[i] ];
}
init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
for(mb_y=0; mb_y<a->mb_height2; mb_y++){
for(mb_x=0; mb_x<a->mb_width2; mb_x++){
if( decode_mb(a, a->block) <0)
return -1;
idct_put(a, mb_x, mb_y);
}
}
if(a->mb_width2 != a->mb_width){
mb_x= a->mb_width2;
for(mb_y=0; mb_y<a->mb_height2; mb_y++){
if( decode_mb(a, a->block) <0)
return -1;
idct_put(a, mb_x, mb_y);
}
}
if(a->mb_height2 != a->mb_height){
mb_y= a->mb_height2;
for(mb_x=0; mb_x<a->mb_width; mb_x++){
if( decode_mb(a, a->block) <0)
return -1;
idct_put(a, mb_x, mb_y);
}
}
*picture = a->picture;
*data_size = sizeof(AVPicture);
emms_c();
return (get_bits_count(&a->gb)+31)/32*4;
}
static av_cold int decode_init(AVCodecContext *avctx){
ASV1Context * const a = avctx->priv_data;
AVFrame *p= &a->picture;
int i;
const int scale= avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
ff_asv_common_init(avctx);
init_vlcs(a);
ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_asv_scantab);
avctx->pix_fmt= AV_PIX_FMT_YUV420P;
if(avctx->extradata_size < 1 || (a->inv_qscale= avctx->extradata[0]) == 0){
av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
if(avctx->codec_id == AV_CODEC_ID_ASV1)
a->inv_qscale= 6;
else
a->inv_qscale= 10;
}
for(i=0; i<64; i++){
int index = ff_asv_scantab[i];
a->intra_matrix[i]= 64*scale*ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
}
p->qstride= a->mb_width;
p->qscale_table= av_malloc( p->qstride * a->mb_height);
p->quality= (32*scale + a->inv_qscale/2)/a->inv_qscale;
memset(p->qscale_table, p->quality, p->qstride*a->mb_height);
return 0;
}
static av_cold int decode_end(AVCodecContext *avctx){
ASV1Context * const a = avctx->priv_data;
av_freep(&a->bitstream_buffer);
av_freep(&a->picture.qscale_table);
a->bitstream_buffer_size=0;
if(a->picture.data[0])
avctx->release_buffer(avctx, &a->picture);
return 0;
}
#if CONFIG_ASV1_DECODER
AVCodec ff_asv1_decoder = {
.name = "asv1",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_ASV1,
.priv_data_size = sizeof(ASV1Context),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
};
#endif
#if CONFIG_ASV2_DECODER
AVCodec ff_asv2_decoder = {
.name = "asv2",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_ASV2,
.priv_data_size = sizeof(ASV1Context),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
};
#endif
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