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eatqi.c
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eatqi.c
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/*
* Electronic Arts TQI Video Decoder
* Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Electronic Arts TQI Video Decoder
* by Peter Ross <pross@xvid.org>
*
* Technical details here:
* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI
*/
#include "avcodec.h"
#include "get_bits.h"
#include "dsputil.h"
#include "aandcttab.h"
#include "mpeg12.h"
#include "mpegvideo.h"
typedef struct TqiContext {
MpegEncContext s;
AVFrame frame;
void *bitstream_buf;
unsigned int bitstream_buf_size;
DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
} TqiContext;
static av_cold int tqi_decode_init(AVCodecContext *avctx)
{
TqiContext *t = avctx->priv_data;
MpegEncContext *s = &t->s;
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->intra_scantable, ff_zigzag_direct);
s->qscale = 1;
avctx->time_base = (AVRational){1, 15};
avctx->pix_fmt = PIX_FMT_YUV420P;
ff_mpeg12_init_vlcs();
return 0;
}
static int tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64])
{
int n;
s->dsp.clear_blocks(block[0]);
for (n=0; n<6; n++)
if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0)
return -1;
return 0;
}
static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64])
{
MpegEncContext *s = &t->s;
int linesize= t->frame.linesize[0];
uint8_t *dest_y = t->frame.data[0] + (s->mb_y * 16* linesize ) + s->mb_x * 16;
uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8;
uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->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, t->frame.linesize[1], block[4]);
s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]);
}
}
static void tqi_calculate_qtable(MpegEncContext *s, int quant)
{
const int qscale = (215 - 2*quant)*5;
int i;
if (s->avctx->idct_algo==FF_IDCT_EA) {
s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
for(i=1; i<64; i++)
s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
}else{
s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
for(i=1; i<64; i++)
s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3;
}
}
static int tqi_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_end = buf+buf_size;
TqiContext *t = avctx->priv_data;
MpegEncContext *s = &t->s;
s->width = AV_RL16(&buf[0]);
s->height = AV_RL16(&buf[2]);
tqi_calculate_qtable(s, buf[4]);
buf += 8;
if (t->frame.data[0])
avctx->release_buffer(avctx, &t->frame);
if (s->avctx->width!=s->width || s->avctx->height!=s->height)
avcodec_set_dimensions(s->avctx, s->width, s->height);
if(avctx->get_buffer(avctx, &t->frame) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
av_fast_malloc(&t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE);
if (!t->bitstream_buf)
return AVERROR(ENOMEM);
s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
{
if (tqi_decode_mb(s, t->block) < 0)
break;
tqi_idct_put(t, t->block);
}
*data_size = sizeof(AVFrame);
*(AVFrame*)data = t->frame;
return buf_size;
}
static av_cold int tqi_decode_end(AVCodecContext *avctx)
{
TqiContext *t = avctx->priv_data;
if(t->frame.data[0])
avctx->release_buffer(avctx, &t->frame);
av_free(t->bitstream_buf);
return 0;
}
AVCodec ff_eatqi_decoder = {
"eatqi",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_TQI,
sizeof(TqiContext),
tqi_decode_init,
NULL,
tqi_decode_end,
tqi_decode_frame,
CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
};