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ffmpeg / libavcodec / eatqi.c @ 72415b2a

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/*
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 * Electronic Arts TQI Video Decoder
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 * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
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/**
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 * @file eatqi.c
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 * Electronic Arts TQI Video Decoder
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 * by Peter Ross <pross@xvid.org>
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 *
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 * Technical details here:
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 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI
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 */
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#include "avcodec.h"
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#include "get_bits.h"
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#include "dsputil.h"
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#include "aandcttab.h"
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#include "mpeg12.h"
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#include "mpegvideo.h"
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typedef struct TqiContext {
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    MpegEncContext s;
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    AVFrame frame;
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    void *bitstream_buf;
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    unsigned int bitstream_buf_size;
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    DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
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} TqiContext;
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static av_cold int tqi_decode_init(AVCodecContext *avctx)
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{
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    TqiContext *t = avctx->priv_data;
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    MpegEncContext *s = &t->s;
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    s->avctx = avctx;
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    if(avctx->idct_algo==FF_IDCT_AUTO)
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        avctx->idct_algo=FF_IDCT_EA;
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    dsputil_init(&s->dsp, avctx);
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    ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
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    s->qscale = 1;
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    avctx->time_base = (AVRational){1, 15};
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    avctx->pix_fmt = PIX_FMT_YUV420P;
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    ff_mpeg12_init_vlcs();
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    return 0;
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}
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static void tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64])
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{
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    int n;
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    s->dsp.clear_blocks(block[0]);
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    for (n=0; n<6; n++)
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        ff_mpeg1_decode_block_intra(s, block[n], n);
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}
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static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64])
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{
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    MpegEncContext *s = &t->s;
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    int linesize= t->frame.linesize[0];
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    uint8_t *dest_y  = t->frame.data[0] + (s->mb_y * 16* linesize            ) + s->mb_x * 16;
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    uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8;
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    uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->mb_x * 8;
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    s->dsp.idct_put(dest_y                 , linesize, block[0]);
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    s->dsp.idct_put(dest_y              + 8, linesize, block[1]);
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    s->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
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    s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
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    if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
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        s->dsp.idct_put(dest_cb, t->frame.linesize[1], block[4]);
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        s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]);
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    }
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}
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static void tqi_calculate_qtable(MpegEncContext *s, int quant)
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{
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    const int qscale = (215 - 2*quant)*5;
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    int i;
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    if (s->avctx->idct_algo==FF_IDCT_EA) {
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        s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
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        for(i=1; i<64; i++)
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            s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
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    }else{
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        s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
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        for(i=1; i<64; i++)
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            s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3;
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    }
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}
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static int tqi_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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    const uint8_t *buf_end = buf+buf_size;
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    TqiContext *t = avctx->priv_data;
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    MpegEncContext *s = &t->s;
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    s->width  = AV_RL16(&buf[0]);
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    s->height = AV_RL16(&buf[2]);
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    tqi_calculate_qtable(s, buf[4]);
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    buf += 8;
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    if (t->frame.data[0])
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        avctx->release_buffer(avctx, &t->frame);
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    if (s->avctx->width!=s->width || s->avctx->height!=s->height)
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        avcodec_set_dimensions(s->avctx, s->width, s->height);
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    if(avctx->get_buffer(avctx, &t->frame) < 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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    av_fast_malloc(&t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE);
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    if (!t->bitstream_buf)
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        return AVERROR(ENOMEM);
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    s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
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    init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
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    s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
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    for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
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    for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
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    {
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        tqi_decode_mb(s, t->block);
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        tqi_idct_put(t, t->block);
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    }
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    *data_size = sizeof(AVFrame);
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    *(AVFrame*)data = t->frame;
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    return buf_size;
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}
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static av_cold int tqi_decode_end(AVCodecContext *avctx)
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{
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    TqiContext *t = avctx->priv_data;
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    if(t->frame.data[0])
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        avctx->release_buffer(avctx, &t->frame);
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    av_free(t->bitstream_buf);
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    return 0;
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}
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AVCodec eatqi_decoder = {
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    "eatqi",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_TQI,
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    sizeof(TqiContext),
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    tqi_decode_init,
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    NULL,
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    tqi_decode_end,
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    tqi_decode_frame,
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    CODEC_CAP_DR1,
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    .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
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};