LCOV - code coverage report
Current view: top level - libavcodec - eatqi.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 74 80 92.5 %
Date: 2017-12-15 11:05:35 Functions: 6 6 100.0 %

          Line data    Source code
       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             : 
      39             : typedef struct TqiContext {
      40             :     AVCodecContext *avctx;
      41             :     GetBitContext gb;
      42             :     BlockDSPContext bdsp;
      43             :     BswapDSPContext bsdsp;
      44             :     IDCTDSPContext idsp;
      45             :     ScanTable intra_scantable;
      46             : 
      47             :     void *bitstream_buf;
      48             :     unsigned int bitstream_buf_size;
      49             : 
      50             :     int mb_x, mb_y;
      51             :     uint16_t intra_matrix[64];
      52             :     int last_dc[3];
      53             : 
      54             :     DECLARE_ALIGNED(32, int16_t, block)[6][64];
      55             : } TqiContext;
      56             : 
      57           3 : static av_cold int tqi_decode_init(AVCodecContext *avctx)
      58             : {
      59           3 :     TqiContext *t = avctx->priv_data;
      60             : 
      61           3 :     ff_blockdsp_init(&t->bdsp, avctx);
      62           3 :     ff_bswapdsp_init(&t->bsdsp);
      63           3 :     ff_idctdsp_init(&t->idsp, avctx);
      64           3 :     ff_init_scantable_permutation(t->idsp.idct_permutation, FF_IDCT_PERM_NONE);
      65           3 :     ff_init_scantable(t->idsp.idct_permutation, &t->intra_scantable, ff_zigzag_direct);
      66             : 
      67           3 :     avctx->framerate = (AVRational){ 15, 1 };
      68           3 :     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
      69           3 :     ff_mpeg12_init_vlcs();
      70           3 :     return 0;
      71             : }
      72             : 
      73        8400 : static int tqi_decode_mb(TqiContext *t, int16_t (*block)[64])
      74             : {
      75             :     int n;
      76             : 
      77        8400 :     t->bdsp.clear_blocks(block[0]);
      78       58800 :     for (n = 0; n < 6; n++) {
      79       50400 :         int ret = ff_mpeg1_decode_block_intra(&t->gb,
      80       50400 :                                               t->intra_matrix,
      81       50400 :                                               t->intra_scantable.permutated,
      82       50400 :                                               t->last_dc, block[n], n, 1);
      83       50400 :         if (ret < 0) {
      84           0 :             av_log(t->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
      85             :                    t->mb_x, t->mb_y);
      86           0 :             return -1;
      87             :         }
      88             :     }
      89             : 
      90        8400 :     return 0;
      91             : }
      92             : 
      93        8400 : static inline void tqi_idct_put(AVCodecContext *avctx, AVFrame *frame,
      94             :                                 int16_t (*block)[64])
      95             : {
      96        8400 :     TqiContext *t = avctx->priv_data;
      97        8400 :     ptrdiff_t linesize = frame->linesize[0];
      98        8400 :     uint8_t *dest_y  = frame->data[0] + t->mb_y * 16 * linesize           + t->mb_x * 16;
      99        8400 :     uint8_t *dest_cb = frame->data[1] + t->mb_y *  8 * frame->linesize[1] + t->mb_x *  8;
     100        8400 :     uint8_t *dest_cr = frame->data[2] + t->mb_y *  8 * frame->linesize[2] + t->mb_x *  8;
     101             : 
     102        8400 :     ff_ea_idct_put_c(dest_y                 , linesize, block[0]);
     103        8400 :     ff_ea_idct_put_c(dest_y              + 8, linesize, block[1]);
     104        8400 :     ff_ea_idct_put_c(dest_y + 8*linesize    , linesize, block[2]);
     105        8400 :     ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
     106             : 
     107        8400 :     if (!(avctx->flags & AV_CODEC_FLAG_GRAY)) {
     108        8400 :         ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
     109        8400 :         ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
     110             :     }
     111        8400 : }
     112             : 
     113          28 : static void tqi_calculate_qtable(TqiContext *t, int quant)
     114             : {
     115          28 :     const int64_t qscale = (215 - 2*quant)*5;
     116             :     int i;
     117             : 
     118          28 :     t->intra_matrix[0] = (ff_inv_aanscales[0] * ff_mpeg1_default_intra_matrix[0]) >> 11;
     119        1792 :     for(i=1; i<64; i++)
     120        1764 :         t->intra_matrix[i] = (ff_inv_aanscales[i] * ff_mpeg1_default_intra_matrix[i] * qscale + 32) >> 14;
     121          28 : }
     122             : 
     123          28 : static int tqi_decode_frame(AVCodecContext *avctx,
     124             :                             void *data, int *got_frame,
     125             :                             AVPacket *avpkt)
     126             : {
     127          28 :     const uint8_t *buf = avpkt->data;
     128          28 :     int buf_size = avpkt->size;
     129          28 :     const uint8_t *buf_end = buf+buf_size;
     130          28 :     TqiContext *t = avctx->priv_data;
     131          28 :     AVFrame *frame = data;
     132             :     int ret, w, h;
     133             : 
     134          28 :     t->avctx = avctx;
     135             : 
     136          28 :     w = AV_RL16(&buf[0]);
     137          28 :     h = AV_RL16(&buf[2]);
     138          28 :     tqi_calculate_qtable(t, buf[4]);
     139          28 :     buf += 8;
     140             : 
     141          28 :     ret = ff_set_dimensions(avctx, w, h);
     142          28 :     if (ret < 0)
     143           0 :         return ret;
     144             : 
     145          28 :     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
     146           0 :         return ret;
     147             : 
     148          28 :     av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
     149          28 :                           buf_end - buf);
     150          28 :     if (!t->bitstream_buf)
     151           0 :         return AVERROR(ENOMEM);
     152          56 :     t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
     153          28 :                        (buf_end - buf) / 4);
     154          28 :     init_get_bits(&t->gb, t->bitstream_buf, 8 * (buf_end - buf));
     155             : 
     156          28 :     t->last_dc[0] =
     157          28 :     t->last_dc[1] =
     158          28 :     t->last_dc[2] = 0;
     159         364 :     for (t->mb_y = 0; t->mb_y < (h + 15) / 16; t->mb_y++) {
     160        8736 :         for (t->mb_x = 0; t->mb_x < (w + 15) / 16; t->mb_x++) {
     161        8400 :             if (tqi_decode_mb(t, t->block) < 0)
     162           0 :                 goto end;
     163        8400 :             tqi_idct_put(avctx, frame, t->block);
     164             :         }
     165             :     }
     166          28 :     end:
     167             : 
     168          28 :     *got_frame = 1;
     169          28 :     return buf_size;
     170             : }
     171             : 
     172           3 : static av_cold int tqi_decode_end(AVCodecContext *avctx)
     173             : {
     174           3 :     TqiContext *t = avctx->priv_data;
     175           3 :     av_freep(&t->bitstream_buf);
     176           3 :     return 0;
     177             : }
     178             : 
     179             : AVCodec ff_eatqi_decoder = {
     180             :     .name           = "eatqi",
     181             :     .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
     182             :     .type           = AVMEDIA_TYPE_VIDEO,
     183             :     .id             = AV_CODEC_ID_TQI,
     184             :     .priv_data_size = sizeof(TqiContext),
     185             :     .init           = tqi_decode_init,
     186             :     .close          = tqi_decode_end,
     187             :     .decode         = tqi_decode_frame,
     188             :     .capabilities   = AV_CODEC_CAP_DR1,
     189             : };

Generated by: LCOV version 1.13