mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
aaf47bcde7
The prefix is a historic remnant that probably meant "alternative". Now that the A32 bitstream reader has been dropped it makes no sense anymore.
257 lines
8.2 KiB
C
257 lines
8.2 KiB
C
/*
|
|
* Electronic Arts TGQ Video Decoder
|
|
* Copyright (c) 2007-2008 Peter Ross <pross@xvid.org>
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Electronic Arts TGQ Video Decoder
|
|
* @author Peter Ross <pross@xvid.org>
|
|
*
|
|
* Technical details here:
|
|
* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#define BITSTREAM_READER_LE
|
|
#include "get_bits.h"
|
|
#include "bytestream.h"
|
|
#include "dsputil.h"
|
|
#include "aandcttab.h"
|
|
|
|
typedef struct TgqContext {
|
|
AVCodecContext *avctx;
|
|
DSPContext dsp;
|
|
AVFrame frame;
|
|
int width,height;
|
|
ScanTable scantable;
|
|
int qtable[64];
|
|
DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
|
|
} TgqContext;
|
|
|
|
static av_cold int tgq_decode_init(AVCodecContext *avctx){
|
|
TgqContext *s = avctx->priv_data;
|
|
s->avctx = avctx;
|
|
if(avctx->idct_algo==FF_IDCT_AUTO)
|
|
avctx->idct_algo=FF_IDCT_EA;
|
|
dsputil_init(&s->dsp, avctx);
|
|
ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
|
|
avctx->time_base = (AVRational){1, 15};
|
|
avctx->pix_fmt = PIX_FMT_YUV420P;
|
|
return 0;
|
|
}
|
|
|
|
static void tgq_decode_block(TgqContext *s, DCTELEM block[64], GetBitContext *gb){
|
|
uint8_t *perm = s->scantable.permutated;
|
|
int i,j,value;
|
|
block[0] = get_sbits(gb,8) * s->qtable[0];
|
|
for(i=1; i<64; ) {
|
|
switch(show_bits(gb,3)) {
|
|
case 4:
|
|
block[perm[i++]] = 0;
|
|
case 0:
|
|
block[perm[i++]] = 0;
|
|
skip_bits(gb,3);
|
|
break;
|
|
case 5:
|
|
case 1:
|
|
skip_bits(gb,2);
|
|
value = get_bits(gb,6);
|
|
for(j=0; j<value; j++)
|
|
block[perm[i++]] = 0;
|
|
break;
|
|
case 6:
|
|
skip_bits(gb,3);
|
|
block[perm[i]] = -s->qtable[perm[i]];
|
|
i++;
|
|
break;
|
|
case 2:
|
|
skip_bits(gb,3);
|
|
block[perm[i]] = s->qtable[perm[i]];
|
|
i++;
|
|
break;
|
|
case 7: // 111b
|
|
case 3: // 011b
|
|
skip_bits(gb,2);
|
|
if (show_bits(gb,6)==0x3F) {
|
|
skip_bits(gb, 6);
|
|
block[perm[i]] = get_sbits(gb,8)*s->qtable[perm[i]];
|
|
}else{
|
|
block[perm[i]] = get_sbits(gb,6)*s->qtable[perm[i]];
|
|
}
|
|
i++;
|
|
break;
|
|
}
|
|
}
|
|
block[0] += 128<<4;
|
|
}
|
|
|
|
static void tgq_idct_put_mb(TgqContext *s, DCTELEM (*block)[64], int mb_x, int mb_y){
|
|
int linesize= s->frame.linesize[0];
|
|
uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
|
|
uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
|
|
uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
|
|
|
|
s->dsp.idct_put(dest_y , linesize, block[0]);
|
|
s->dsp.idct_put(dest_y + 8, linesize, block[1]);
|
|
s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
|
|
s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
|
|
if(!(s->avctx->flags&CODEC_FLAG_GRAY)){
|
|
s->dsp.idct_put(dest_cb, s->frame.linesize[1], block[4]);
|
|
s->dsp.idct_put(dest_cr, s->frame.linesize[2], block[5]);
|
|
}
|
|
}
|
|
|
|
static inline void tgq_dconly(TgqContext *s, unsigned char *dst, int dst_stride, int dc){
|
|
int level = av_clip_uint8((dc*s->qtable[0] + 2056)>>4);
|
|
int j;
|
|
for(j=0;j<8;j++)
|
|
memset(dst+j*dst_stride, level, 8);
|
|
}
|
|
|
|
static void tgq_idct_put_mb_dconly(TgqContext *s, int mb_x, int mb_y, const int8_t *dc)
|
|
{
|
|
int linesize= s->frame.linesize[0];
|
|
uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
|
|
uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8;
|
|
uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8;
|
|
tgq_dconly(s,dest_y , linesize, dc[0]);
|
|
tgq_dconly(s,dest_y + 8, linesize, dc[1]);
|
|
tgq_dconly(s,dest_y + 8*linesize , linesize, dc[2]);
|
|
tgq_dconly(s,dest_y + 8*linesize + 8, linesize, dc[3]);
|
|
if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
|
|
tgq_dconly(s,dest_cb, s->frame.linesize[1], dc[4]);
|
|
tgq_dconly(s,dest_cr, s->frame.linesize[2], dc[5]);
|
|
}
|
|
}
|
|
|
|
static void tgq_decode_mb(TgqContext *s, int mb_y, int mb_x, const uint8_t **bs, const uint8_t *buf_end){
|
|
int mode;
|
|
int i;
|
|
int8_t dc[6];
|
|
|
|
mode = bytestream_get_byte(bs);
|
|
if (mode>buf_end-*bs) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "truncated macroblock\n");
|
|
return;
|
|
}
|
|
|
|
if (mode>12) {
|
|
GetBitContext gb;
|
|
init_get_bits(&gb, *bs, mode*8);
|
|
for(i=0; i<6; i++)
|
|
tgq_decode_block(s, s->block[i], &gb);
|
|
tgq_idct_put_mb(s, s->block, mb_x, mb_y);
|
|
}else{
|
|
if (mode==3) {
|
|
memset(dc, (*bs)[0], 4);
|
|
dc[4] = (*bs)[1];
|
|
dc[5] = (*bs)[2];
|
|
}else if (mode==6) {
|
|
memcpy(dc, *bs, 6);
|
|
}else if (mode==12) {
|
|
for(i=0; i<6; i++)
|
|
dc[i] = (*bs)[i*2];
|
|
}else{
|
|
av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
|
|
}
|
|
tgq_idct_put_mb_dconly(s, mb_x, mb_y, dc);
|
|
}
|
|
*bs += mode;
|
|
}
|
|
|
|
static void tgq_calculate_qtable(TgqContext *s, int quant){
|
|
int i,j;
|
|
const int a = (14*(100-quant))/100 + 1;
|
|
const int b = (11*(100-quant))/100 + 4;
|
|
for(j=0;j<8;j++)
|
|
for(i=0;i<8;i++)
|
|
if (s->avctx->idct_algo==FF_IDCT_EA)
|
|
s->qtable[j*8+i] = ((a*(j+i)/(7+7) + b)*ff_inv_aanscales[j*8+i])>>(14-4);
|
|
else
|
|
s->qtable[j*8+i] = (a*(j+i)/(7+7) + b)<<3;
|
|
}
|
|
|
|
static int tgq_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
AVPacket *avpkt){
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
const uint8_t *buf_start = buf;
|
|
const uint8_t *buf_end = buf + buf_size;
|
|
TgqContext *s = avctx->priv_data;
|
|
int x,y;
|
|
|
|
int big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
|
|
buf += 8;
|
|
|
|
if(8>buf_end-buf) {
|
|
av_log(avctx, AV_LOG_WARNING, "truncated header\n");
|
|
return -1;
|
|
}
|
|
s->width = big_endian ? AV_RB16(&buf[0]) : AV_RL16(&buf[0]);
|
|
s->height = big_endian ? AV_RB16(&buf[2]) : AV_RL16(&buf[2]);
|
|
|
|
if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
|
|
avcodec_set_dimensions(s->avctx, s->width, s->height);
|
|
if (s->frame.data[0])
|
|
avctx->release_buffer(avctx, &s->frame);
|
|
}
|
|
tgq_calculate_qtable(s, buf[4]);
|
|
buf += 8;
|
|
|
|
if (!s->frame.data[0]) {
|
|
s->frame.key_frame = 1;
|
|
s->frame.pict_type = AV_PICTURE_TYPE_I;
|
|
s->frame.buffer_hints = FF_BUFFER_HINTS_VALID;
|
|
if (avctx->get_buffer(avctx, &s->frame)) {
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
for (y=0; y<(avctx->height+15)/16; y++)
|
|
for (x=0; x<(avctx->width+15)/16; x++)
|
|
tgq_decode_mb(s, y, x, &buf, buf_end);
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data = s->frame;
|
|
|
|
return buf-buf_start;
|
|
}
|
|
|
|
static av_cold int tgq_decode_end(AVCodecContext *avctx){
|
|
TgqContext *s = avctx->priv_data;
|
|
if (s->frame.data[0])
|
|
s->avctx->release_buffer(avctx, &s->frame);
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_eatgq_decoder = {
|
|
.name = "eatgq",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = CODEC_ID_TGQ,
|
|
.priv_data_size = sizeof(TgqContext),
|
|
.init = tgq_decode_init,
|
|
.close = tgq_decode_end,
|
|
.decode = tgq_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
|
|
};
|