libavcodec/eatqi.c

   1 /*
   2  * Electronic Arts TQI Video Decoder
   3  * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20  */
  21
  22 /**
  23  * @file eatqi.c
  24  * Electronic Arts TQI Video Decoder
  25  * by Peter Ross <pross@xvid.org>
  26  *
  27  * Technical details here:
  28  * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI
  29  */
  30
  31 #include "avcodec.h"
  32 #include "get_bits.h"
  33 #include "dsputil.h"
  34 #include "aandcttab.h"
  35 #include "mpeg12.h"
  36 #include "mpegvideo.h"
  37
  38 typedef struct TqiContext {
  39     MpegEncContext s;
  40     AVFrame frame;
  41     void *bitstream_buf;
  42     unsigned int bitstream_buf_size;
  43 } TqiContext;
  44
  45 static av_cold int tqi_decode_init(AVCodecContext *avctx)
  46 {
  47     TqiContext *t = avctx->priv_data;
  48     MpegEncContext *s = &t->s;
  49     s->avctx = avctx;
  50     if(avctx->idct_algo==FF_IDCT_AUTO)
  51         avctx->idct_algo=FF_IDCT_EA;
  52     dsputil_init(&s->dsp, avctx);
  53     ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
  54     s->qscale = 1;
  55     avctx->time_base = (AVRational){1, 15};
  56     avctx->pix_fmt = PIX_FMT_YUV420P;
  57     ff_mpeg12_init_vlcs();
  58     return 0;
  59 }
  60
  61 static void tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64])
  62 {
  63     int n;
  64     s->dsp.clear_blocks(block[0]);
  65     for (n=0; n<6; n++)
  66         ff_mpeg1_decode_block_intra(s, block[n], n);
  67 }
  68
  69 static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64])
  70 {
  71     MpegEncContext *s = &t->s;
  72     int linesize= t->frame.linesize[0];
  73     uint8_t *dest_y  = t->frame.data[0] + (s->mb_y * 16* linesize            ) + s->mb_x * 16;
  74     uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8;
  75     uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->mb_x * 8;
  76
  77     s->dsp.idct_put(dest_y                 , linesize, block[0]);
  78     s->dsp.idct_put(dest_y              + 8, linesize, block[1]);
  79     s->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
  80     s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
  81     if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
  82         s->dsp.idct_put(dest_cb, t->frame.linesize[1], block[4]);
  83         s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]);
  84     }
  85 }
  86
  87 static void tqi_calculate_qtable(MpegEncContext *s, int quant)
  88 {
  89     const int qscale = (215 - 2*quant)*5;
  90     int i;
  91     if (s->avctx->idct_algo==FF_IDCT_EA) {
  92         s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
  93         for(i=1; i<64; i++)
  94             s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
  95     }else{
  96         s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
  97         for(i=1; i<64; i++)
  98             s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3;
  99     }
 100 }
 101
 102 static int tqi_decode_frame(AVCodecContext *avctx,
 103                             void *data, int *data_size,
 104                             AVPacket *avpkt)
 105 {
 106     const uint8_t *buf = avpkt->data;
 107     int buf_size = avpkt->size;
 108     const uint8_t *buf_end = buf+buf_size;
 109     TqiContext *t = avctx->priv_data;
 110     MpegEncContext *s = &t->s;
 111     DECLARE_ALIGNED_16(DCTELEM, block[6][64]);
 112
 113     s->width  = AV_RL16(&buf[0]);
 114     s->height = AV_RL16(&buf[2]);
 115     tqi_calculate_qtable(s, buf[4]);
 116     buf += 8;
 117
 118     if (t->frame.data[0])
 119         avctx->release_buffer(avctx, &t->frame);
 120
 121     if (s->avctx->width!=s->width || s->avctx->height!=s->height)
 122         avcodec_set_dimensions(s->avctx, s->width, s->height);
 123
 124     if(avctx->get_buffer(avctx, &t->frame) < 0) {
 125         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 126         return -1;
 127     }
 128
 129     av_fast_malloc(&t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE);
 130     if (!t->bitstream_buf)
 131         return AVERROR(ENOMEM);
 132     s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
 133     init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
 134
 135     s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
 136     for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
 137     for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
 138     {
 139         tqi_decode_mb(s, block);
 140         tqi_idct_put(t, block);
 141     }
 142
 143     *data_size = sizeof(AVFrame);
 144     *(AVFrame*)data = t->frame;
 145     return buf_size;
 146 }
 147
 148 static av_cold int tqi_decode_end(AVCodecContext *avctx)
 149 {
 150     TqiContext *t = avctx->priv_data;
 151     if(t->frame.data[0])
 152         avctx->release_buffer(avctx, &t->frame);
 153     av_free(t->bitstream_buf);
 154     return 0;
 155 }
 156
 157 AVCodec eatqi_decoder = {
 158     "eatqi",
 159     CODEC_TYPE_VIDEO,
 160     CODEC_ID_TQI,
 161     sizeof(TqiContext),
 162     tqi_decode_init,
 163     NULL,
 164     tqi_decode_end,
 165     tqi_decode_frame,
 166     CODEC_CAP_DR1,
 167     .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
 168 };