LCOV - code coverage report
Current view: top level - libavcodec - eamad.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 155 183 84.7 %
Date: 2017-12-11 04:34:20 Functions: 10 10 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Electronic Arts Madcow Video Decoder
       3             :  * Copyright (c) 2007-2009 Peter Ross
       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 Madcow Video Decoder
      25             :  * @author Peter Ross <pross@xvid.org>
      26             :  *
      27             :  * @see technical details at
      28             :  * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_MAD
      29             :  */
      30             : 
      31             : #include "avcodec.h"
      32             : #include "blockdsp.h"
      33             : #include "bytestream.h"
      34             : #include "bswapdsp.h"
      35             : #include "get_bits.h"
      36             : #include "aandcttab.h"
      37             : #include "eaidct.h"
      38             : #include "idctdsp.h"
      39             : #include "internal.h"
      40             : #include "mpeg12data.h"
      41             : #include "mpeg12vlc.h"
      42             : 
      43             : #define EA_PREAMBLE_SIZE    8
      44             : #define MADk_TAG MKTAG('M', 'A', 'D', 'k')    /* MAD I-frame */
      45             : #define MADm_TAG MKTAG('M', 'A', 'D', 'm')    /* MAD P-frame */
      46             : #define MADe_TAG MKTAG('M', 'A', 'D', 'e')    /* MAD lqp-frame */
      47             : 
      48             : typedef struct MadContext {
      49             :     AVCodecContext *avctx;
      50             :     BlockDSPContext bdsp;
      51             :     BswapDSPContext bbdsp;
      52             :     IDCTDSPContext idsp;
      53             :     AVFrame *last_frame;
      54             :     GetBitContext gb;
      55             :     void *bitstream_buf;
      56             :     unsigned int bitstream_buf_size;
      57             :     DECLARE_ALIGNED(32, int16_t, block)[64];
      58             :     ScanTable scantable;
      59             :     uint16_t quant_matrix[64];
      60             :     int mb_x;
      61             :     int mb_y;
      62             : } MadContext;
      63             : 
      64           4 : static av_cold int decode_init(AVCodecContext *avctx)
      65             : {
      66           4 :     MadContext *s = avctx->priv_data;
      67           4 :     s->avctx = avctx;
      68           4 :     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
      69           4 :     ff_blockdsp_init(&s->bdsp, avctx);
      70           4 :     ff_bswapdsp_init(&s->bbdsp);
      71           4 :     ff_idctdsp_init(&s->idsp, avctx);
      72           4 :     ff_init_scantable_permutation(s->idsp.idct_permutation, FF_IDCT_PERM_NONE);
      73           4 :     ff_init_scantable(s->idsp.idct_permutation, &s->scantable, ff_zigzag_direct);
      74           4 :     ff_mpeg12_init_vlcs();
      75             : 
      76           4 :     s->last_frame = av_frame_alloc();
      77           4 :     if (!s->last_frame)
      78           0 :         return AVERROR(ENOMEM);
      79             : 
      80           4 :     return 0;
      81             : }
      82             : 
      83      665174 : static inline void comp(unsigned char *dst, ptrdiff_t dst_stride,
      84             :                         unsigned char *src, ptrdiff_t src_stride, int add)
      85             : {
      86             :     int j, i;
      87     5986566 :     for (j=0; j<8; j++)
      88    47892528 :         for (i=0; i<8; i++)
      89    42571136 :             dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
      90      665174 : }
      91             : 
      92      665174 : static inline void comp_block(MadContext *t, AVFrame *frame,
      93             :                               int mb_x, int mb_y,
      94             :                               int j, int mv_x, int mv_y, int add)
      95             : {
      96      665174 :     if (j < 4) {
      97      437978 :         unsigned offset = (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x;
      98      437978 :         if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7)
      99           0 :             return;
     100     1313934 :         comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
     101      437978 :              frame->linesize[0],
     102      875956 :              t->last_frame->data[0] + offset,
     103      437978 :              t->last_frame->linesize[0], add);
     104      227196 :     } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
     105      227196 :         int index = j - 3;
     106      227196 :         unsigned offset = (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2);
     107      227196 :         if (offset >= (t->avctx->height/2 - 7) * t->last_frame->linesize[index] - 7)
     108           0 :             return;
     109      681588 :         comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8,
     110      227196 :              frame->linesize[index],
     111      454392 :              t->last_frame->data[index] + offset,
     112      227196 :              t->last_frame->linesize[index], add);
     113             :     }
     114             : }
     115             : 
     116      158158 : static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block,
     117             :                             int mb_x, int mb_y, int j)
     118             : {
     119      158158 :     if (j < 4) {
     120      221820 :         ff_ea_idct_put_c(
     121      110910 :             frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
     122      110910 :             frame->linesize[0], block);
     123       47248 :     } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
     124       47248 :         int index = j - 3;
     125       94496 :         ff_ea_idct_put_c(
     126       47248 :             frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8,
     127       47248 :             frame->linesize[index], block);
     128             :     }
     129      158158 : }
     130             : 
     131      158158 : static inline int decode_block_intra(MadContext *s, int16_t * block)
     132             : {
     133             :     int level, i, j, run;
     134      158158 :     RLTable *rl = &ff_rl_mpeg1;
     135      158158 :     const uint8_t *scantable = s->scantable.permutated;
     136      158158 :     int16_t *quant_matrix = s->quant_matrix;
     137             : 
     138      158158 :     block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0];
     139             : 
     140             :     /* The RL decoder is derived from mpeg1_decode_block_intra;
     141             :        Escaped level and run values a decoded differently */
     142      158158 :     i = 0;
     143             :     {
     144      158158 :         OPEN_READER(re, &s->gb);
     145             :         /* now quantify & encode AC coefficients */
     146             :         for (;;) {
     147     2066278 :             UPDATE_CACHE(re, &s->gb);
     148     1112218 :             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
     149             : 
     150     1112218 :             if (level == 127) {
     151      158158 :                 break;
     152      954060 :             } else if (level != 0) {
     153      913987 :                 i += run;
     154      913987 :                 if (i > 63) {
     155           0 :                     av_log(s->avctx, AV_LOG_ERROR,
     156             :                            "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
     157           0 :                     return -1;
     158             :                 }
     159      913987 :                 j = scantable[i];
     160      913987 :                 level = (level*quant_matrix[j]) >> 4;
     161      913987 :                 level = (level-1)|1;
     162      913987 :                 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
     163      913987 :                 LAST_SKIP_BITS(re, &s->gb, 1);
     164             :             } else {
     165             :                 /* escape */
     166       40073 :                 UPDATE_CACHE(re, &s->gb);
     167       40073 :                 level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);
     168             : 
     169       40073 :                 UPDATE_CACHE(re, &s->gb);
     170       40073 :                 run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
     171             : 
     172       40073 :                 i += run;
     173       40073 :                 if (i > 63) {
     174           0 :                     av_log(s->avctx, AV_LOG_ERROR,
     175             :                            "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
     176           0 :                     return -1;
     177             :                 }
     178       40073 :                 j = scantable[i];
     179       40073 :                 if (level < 0) {
     180       20920 :                     level = -level;
     181       20920 :                     level = (level*quant_matrix[j]) >> 4;
     182       20920 :                     level = (level-1)|1;
     183       20920 :                     level = -level;
     184             :                 } else {
     185       19153 :                     level = (level*quant_matrix[j]) >> 4;
     186       19153 :                     level = (level-1)|1;
     187             :                 }
     188             :             }
     189             : 
     190      954060 :             block[j] = level;
     191             :         }
     192      158158 :         CLOSE_READER(re, &s->gb);
     193             :     }
     194      158158 :     return 0;
     195             : }
     196             : 
     197      897656 : static int decode_motion(GetBitContext *gb)
     198             : {
     199      897656 :     int value = 0;
     200      897656 :     if (get_bits1(gb)) {
     201      300433 :         if (get_bits1(gb))
     202      163614 :             value = -17;
     203      300433 :         value += get_bits(gb, 4) + 1;
     204             :     }
     205      897656 :     return value;
     206             : }
     207             : 
     208      137222 : static int decode_mb(MadContext *s, AVFrame *frame, int inter)
     209             : {
     210      137222 :     int mv_map = 0;
     211      137222 :     int av_uninit(mv_x), av_uninit(mv_y);
     212             :     int j;
     213             : 
     214      137222 :     if (inter) {
     215      119970 :         int v = decode210(&s->gb);
     216      119970 :         if (v < 2) {
     217      116241 :             mv_map = v ? get_bits(&s->gb, 6) : 63;
     218      116241 :             mv_x = decode_motion(&s->gb);
     219      116241 :             mv_y = decode_motion(&s->gb);
     220             :         }
     221             :     }
     222             : 
     223      960554 :     for (j=0; j<6; j++) {
     224      823332 :         if (mv_map & (1<<j)) {  // mv_x and mv_y are guarded by mv_map
     225      665174 :             int add = 2*decode_motion(&s->gb);
     226      665174 :             if (s->last_frame->data[0])
     227      665174 :                 comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
     228             :         } else {
     229      158158 :             s->bdsp.clear_block(s->block);
     230      158158 :             if(decode_block_intra(s, s->block) < 0)
     231           0 :                 return -1;
     232      158158 :             idct_put(s, frame, s->block, s->mb_x, s->mb_y, j);
     233             :         }
     234             :     }
     235      137222 :     return 0;
     236             : }
     237             : 
     238          99 : static void calc_quant_matrix(MadContext *s, int qscale)
     239             : {
     240             :     int i;
     241             : 
     242          99 :     s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
     243        6336 :     for (i=1; i<64; i++)
     244        6237 :         s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
     245          99 : }
     246             : 
     247          99 : static int decode_frame(AVCodecContext *avctx,
     248             :                         void *data, int *got_frame,
     249             :                         AVPacket *avpkt)
     250             : {
     251          99 :     const uint8_t *buf = avpkt->data;
     252          99 :     int buf_size       = avpkt->size;
     253          99 :     MadContext *s     = avctx->priv_data;
     254          99 :     AVFrame *frame    = data;
     255             :     GetByteContext gb;
     256             :     int width, height;
     257             :     int chunk_type;
     258             :     int inter, ret;
     259             : 
     260          99 :     bytestream2_init(&gb, buf, buf_size);
     261             : 
     262          99 :     chunk_type = bytestream2_get_le32(&gb);
     263          99 :     inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
     264          99 :     bytestream2_skip(&gb, 10);
     265             : 
     266          99 :     av_reduce(&avctx->framerate.den, &avctx->framerate.num,
     267          99 :               bytestream2_get_le16(&gb), 1000, 1<<30);
     268             : 
     269          99 :     width  = bytestream2_get_le16(&gb);
     270          99 :     height = bytestream2_get_le16(&gb);
     271          99 :     bytestream2_skip(&gb, 1);
     272          99 :     calc_quant_matrix(s, bytestream2_get_byte(&gb));
     273          99 :     bytestream2_skip(&gb, 2);
     274             : 
     275          99 :     if (bytestream2_get_bytes_left(&gb) < 2) {
     276           0 :         av_log(avctx, AV_LOG_ERROR, "Input data too small\n");
     277           0 :         return AVERROR_INVALIDDATA;
     278             :     }
     279             : 
     280          99 :     if (width < 16 || height < 16) {
     281           0 :         av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n");
     282           0 :         return AVERROR_INVALIDDATA;
     283             :     }
     284             : 
     285          99 :     if (avctx->width != width || avctx->height != height) {
     286           3 :         av_frame_unref(s->last_frame);
     287           3 :         if((width * (int64_t)height)/2048*7 > bytestream2_get_bytes_left(&gb))
     288           0 :             return AVERROR_INVALIDDATA;
     289           3 :         if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
     290           0 :             return ret;
     291             :     }
     292             : 
     293          99 :     if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
     294           0 :         return ret;
     295             : 
     296          99 :     if (inter && !s->last_frame->data[0]) {
     297           0 :         av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n");
     298           0 :         ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF);
     299           0 :         if (ret < 0)
     300           0 :             return ret;
     301           0 :         memset(s->last_frame->data[0], 0, s->last_frame->height *
     302           0 :                s->last_frame->linesize[0]);
     303           0 :         memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 *
     304           0 :                s->last_frame->linesize[1]);
     305           0 :         memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 *
     306           0 :                s->last_frame->linesize[2]);
     307             :     }
     308             : 
     309          99 :     av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size,
     310          99 :                           bytestream2_get_bytes_left(&gb));
     311          99 :     if (!s->bitstream_buf)
     312           0 :         return AVERROR(ENOMEM);
     313         198 :     s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)),
     314          99 :                          bytestream2_get_bytes_left(&gb) / 2);
     315          99 :     memset((uint8_t*)s->bitstream_buf + bytestream2_get_bytes_left(&gb), 0, AV_INPUT_BUFFER_PADDING_SIZE);
     316          99 :     init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb)));
     317             : 
     318        3153 :     for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
     319      140276 :         for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
     320      137222 :             if(decode_mb(s, frame, inter) < 0)
     321           0 :                 return AVERROR_INVALIDDATA;
     322             : 
     323          99 :     *got_frame = 1;
     324             : 
     325          99 :     if (chunk_type != MADe_TAG) {
     326          51 :         av_frame_unref(s->last_frame);
     327          51 :         if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
     328           0 :             return ret;
     329             :     }
     330             : 
     331          99 :     return buf_size;
     332             : }
     333             : 
     334           4 : static av_cold int decode_end(AVCodecContext *avctx)
     335             : {
     336           4 :     MadContext *t = avctx->priv_data;
     337           4 :     av_frame_free(&t->last_frame);
     338           4 :     av_freep(&t->bitstream_buf);
     339           4 :     return 0;
     340             : }
     341             : 
     342             : AVCodec ff_eamad_decoder = {
     343             :     .name           = "eamad",
     344             :     .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video"),
     345             :     .type           = AVMEDIA_TYPE_VIDEO,
     346             :     .id             = AV_CODEC_ID_MAD,
     347             :     .priv_data_size = sizeof(MadContext),
     348             :     .init           = decode_init,
     349             :     .close          = decode_end,
     350             :     .decode         = decode_frame,
     351             :     .capabilities   = AV_CODEC_CAP_DR1,
     352             : };

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