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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 "blockdsp.h"
  31. #include "bswapdsp.h"
  32. #include "get_bits.h"
  33. #include "aandcttab.h"
  34. #include "eaidct.h"
  35. #include "idctdsp.h"
  36. #include "internal.h"
  37. #include "mpeg12.h"
  38. #include "mpegvideo.h"
  39.  
  40. typedef struct TqiContext {
  41.     MpegEncContext s;
  42.     BswapDSPContext bsdsp;
  43.     void *bitstream_buf;
  44.     unsigned int bitstream_buf_size;
  45.     DECLARE_ALIGNED(16, int16_t, block)[6][64];
  46. } TqiContext;
  47.  
  48. static av_cold int tqi_decode_init(AVCodecContext *avctx)
  49. {
  50.     TqiContext *t = avctx->priv_data;
  51.     MpegEncContext *s = &t->s;
  52.     s->avctx = avctx;
  53.     ff_blockdsp_init(&s->bdsp, avctx);
  54.     ff_bswapdsp_init(&t->bsdsp);
  55.     ff_idctdsp_init(&s->idsp, avctx);
  56.     ff_init_scantable_permutation(s->idsp.idct_permutation, FF_IDCT_PERM_NONE);
  57.     ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
  58.     s->qscale = 1;
  59.     avctx->framerate = (AVRational){ 15, 1 };
  60.     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  61.     ff_mpeg12_init_vlcs();
  62.     return 0;
  63. }
  64.  
  65. static int tqi_decode_mb(MpegEncContext *s, int16_t (*block)[64])
  66. {
  67.     int n;
  68.     s->bdsp.clear_blocks(block[0]);
  69.     for (n=0; n<6; n++)
  70.         if (ff_mpeg1_decode_block_intra(s, block[n], n) < 0)
  71.             return -1;
  72.  
  73.     return 0;
  74. }
  75.  
  76. static inline void tqi_idct_put(TqiContext *t, AVFrame *frame, int16_t (*block)[64])
  77. {
  78.     MpegEncContext *s = &t->s;
  79.     int linesize = frame->linesize[0];
  80.     uint8_t *dest_y  = frame->data[0] + (s->mb_y * 16* linesize            ) + s->mb_x * 16;
  81.     uint8_t *dest_cb = frame->data[1] + (s->mb_y * 8 * frame->linesize[1]) + s->mb_x * 8;
  82.     uint8_t *dest_cr = frame->data[2] + (s->mb_y * 8 * frame->linesize[2]) + s->mb_x * 8;
  83.  
  84.     ff_ea_idct_put_c(dest_y                 , linesize, block[0]);
  85.     ff_ea_idct_put_c(dest_y              + 8, linesize, block[1]);
  86.     ff_ea_idct_put_c(dest_y + 8*linesize    , linesize, block[2]);
  87.     ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
  88.     if(!(s->avctx->flags & AV_CODEC_FLAG_GRAY)) {
  89.         ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
  90.         ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
  91.     }
  92. }
  93.  
  94. static void tqi_calculate_qtable(MpegEncContext *s, int quant)
  95. {
  96.     const int qscale = (215 - 2*quant)*5;
  97.     int i;
  98.     s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
  99.     for(i=1; i<64; i++)
  100.         s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
  101. }
  102.  
  103. static int tqi_decode_frame(AVCodecContext *avctx,
  104.                             void *data, int *got_frame,
  105.                             AVPacket *avpkt)
  106. {
  107.     const uint8_t *buf = avpkt->data;
  108.     int buf_size = avpkt->size;
  109.     const uint8_t *buf_end = buf+buf_size;
  110.     TqiContext *t = avctx->priv_data;
  111.     MpegEncContext *s = &t->s;
  112.     AVFrame *frame = data;
  113.     int ret;
  114.  
  115.     s->width  = AV_RL16(&buf[0]);
  116.     s->height = AV_RL16(&buf[2]);
  117.     tqi_calculate_qtable(s, buf[4]);
  118.     buf += 8;
  119.  
  120.     ret = ff_set_dimensions(s->avctx, s->width, s->height);
  121.     if (ret < 0)
  122.         return ret;
  123.  
  124.     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
  125.         return ret;
  126.  
  127.     av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
  128.                           buf_end - buf);
  129.     if (!t->bitstream_buf)
  130.         return AVERROR(ENOMEM);
  131.     t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
  132.                        (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.         if (tqi_decode_mb(s, t->block) < 0)
  140.             goto end;
  141.         tqi_idct_put(t, frame, t->block);
  142.     }
  143.     end:
  144.  
  145.     *got_frame = 1;
  146.     return buf_size;
  147. }
  148.  
  149. static av_cold int tqi_decode_end(AVCodecContext *avctx)
  150. {
  151.     TqiContext *t = avctx->priv_data;
  152.     av_freep(&t->bitstream_buf);
  153.     return 0;
  154. }
  155.  
  156. AVCodec ff_eatqi_decoder = {
  157.     .name           = "eatqi",
  158.     .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
  159.     .type           = AVMEDIA_TYPE_VIDEO,
  160.     .id             = AV_CODEC_ID_TQI,
  161.     .priv_data_size = sizeof(TqiContext),
  162.     .init           = tqi_decode_init,
  163.     .close          = tqi_decode_end,
  164.     .decode         = tqi_decode_frame,
  165.     .capabilities   = AV_CODEC_CAP_DR1,
  166. };
  167.