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  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
  24.  * Electronic Arts TQI Video Decoder
  25.  * @author Peter Ross <pross@xvid.org>
  26.  * @see http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI
  27.  */
  28.  
  29. #include "avcodec.h"
  30. #include "get_bits.h"
  31. #include "aandcttab.h"
  32. #include "eaidct.h"
  33. #include "internal.h"
  34. #include "mpeg12.h"
  35. #include "mpegvideo.h"
  36.  
  37. typedef struct TqiContext {
  38.     MpegEncContext s;
  39.     void *bitstream_buf;
  40.     unsigned int bitstream_buf_size;
  41.     DECLARE_ALIGNED(16, int16_t, block)[6][64];
  42. } TqiContext;
  43.  
  44. static av_cold int tqi_decode_init(AVCodecContext *avctx)
  45. {
  46.     TqiContext *t = avctx->priv_data;
  47.     MpegEncContext *s = &t->s;
  48.     s->avctx = avctx;
  49.     ff_dsputil_init(&s->dsp, avctx);
  50.     ff_init_scantable_permutation(s->dsp.idct_permutation, FF_NO_IDCT_PERM);
  51.     ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
  52.     s->qscale = 1;
  53.     avctx->time_base = (AVRational){1, 15};
  54.     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  55.     ff_mpeg12_init_vlcs();
  56.     return 0;
  57. }
  58.  
  59. static int tqi_decode_mb(MpegEncContext *s, int16_t (*block)[64])
  60. {
  61.     int n;
  62.     s->dsp.clear_blocks(block[0]);
  63.     for (n=0; n<6; n++)
  64.         if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0)
  65.             return -1;
  66.  
  67.     return 0;
  68. }
  69.  
  70. static inline void tqi_idct_put(TqiContext *t, AVFrame *frame, int16_t (*block)[64])
  71. {
  72.     MpegEncContext *s = &t->s;
  73.     int linesize = frame->linesize[0];
  74.     uint8_t *dest_y  = frame->data[0] + (s->mb_y * 16* linesize            ) + s->mb_x * 16;
  75.     uint8_t *dest_cb = frame->data[1] + (s->mb_y * 8 * frame->linesize[1]) + s->mb_x * 8;
  76.     uint8_t *dest_cr = frame->data[2] + (s->mb_y * 8 * frame->linesize[2]) + s->mb_x * 8;
  77.  
  78.     ff_ea_idct_put_c(dest_y                 , linesize, block[0]);
  79.     ff_ea_idct_put_c(dest_y              + 8, linesize, block[1]);
  80.     ff_ea_idct_put_c(dest_y + 8*linesize    , linesize, block[2]);
  81.     ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
  82.     if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
  83.         ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
  84.         ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
  85.     }
  86. }
  87.  
  88. static void tqi_calculate_qtable(MpegEncContext *s, int quant)
  89. {
  90.     const int qscale = (215 - 2*quant)*5;
  91.     int i;
  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. }
  96.  
  97. static int tqi_decode_frame(AVCodecContext *avctx,
  98.                             void *data, int *got_frame,
  99.                             AVPacket *avpkt)
  100. {
  101.     const uint8_t *buf = avpkt->data;
  102.     int buf_size = avpkt->size;
  103.     const uint8_t *buf_end = buf+buf_size;
  104.     TqiContext *t = avctx->priv_data;
  105.     MpegEncContext *s = &t->s;
  106.     AVFrame *frame = data;
  107.     int ret;
  108.  
  109.     s->width  = AV_RL16(&buf[0]);
  110.     s->height = AV_RL16(&buf[2]);
  111.     tqi_calculate_qtable(s, buf[4]);
  112.     buf += 8;
  113.  
  114.     if (s->avctx->width!=s->width || s->avctx->height!=s->height)
  115.         avcodec_set_dimensions(s->avctx, s->width, s->height);
  116.  
  117.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
  118.         return ret;
  119.  
  120.     av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
  121.                           buf_end - buf);
  122.     if (!t->bitstream_buf)
  123.         return AVERROR(ENOMEM);
  124.     s->dsp.bswap_buf(t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
  125.     init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
  126.  
  127.     s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
  128.     for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
  129.     for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
  130.     {
  131.         if (tqi_decode_mb(s, t->block) < 0)
  132.             goto end;
  133.         tqi_idct_put(t, frame, t->block);
  134.     }
  135.     end:
  136.  
  137.     *got_frame = 1;
  138.     return buf_size;
  139. }
  140.  
  141. static av_cold int tqi_decode_end(AVCodecContext *avctx)
  142. {
  143.     TqiContext *t = avctx->priv_data;
  144.     av_free(t->bitstream_buf);
  145.     return 0;
  146. }
  147.  
  148. AVCodec ff_eatqi_decoder = {
  149.     .name           = "eatqi",
  150.     .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
  151.     .type           = AVMEDIA_TYPE_VIDEO,
  152.     .id             = AV_CODEC_ID_TQI,
  153.     .priv_data_size = sizeof(TqiContext),
  154.     .init           = tqi_decode_init,
  155.     .close          = tqi_decode_end,
  156.     .decode         = tqi_decode_frame,
  157.     .capabilities   = CODEC_CAP_DR1,
  158. };
  159.