LCOV - code coverage report
Current view: top level - src/libavcodec - adx_parser.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 32 0.0 %
Date: 2017-05-26 21:11:57 Functions: 0 1 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2011  Justin Ruggles
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : /**
      22             :  * @file
      23             :  * ADX audio parser
      24             :  *
      25             :  * Splits packets into individual blocks.
      26             :  */
      27             : 
      28             : #include "libavutil/intreadwrite.h"
      29             : #include "parser.h"
      30             : #include "adx.h"
      31             : 
      32             : typedef struct ADXParseContext {
      33             :     ParseContext pc;
      34             :     int header_size;
      35             :     int block_size;
      36             :     int remaining;
      37             : } ADXParseContext;
      38             : 
      39           0 : static int adx_parse(AVCodecParserContext *s1,
      40             :                            AVCodecContext *avctx,
      41             :                            const uint8_t **poutbuf, int *poutbuf_size,
      42             :                            const uint8_t *buf, int buf_size)
      43             : {
      44           0 :     ADXParseContext *s = s1->priv_data;
      45           0 :     ParseContext *pc = &s->pc;
      46           0 :     int next = END_NOT_FOUND;
      47             :     int i;
      48           0 :     uint64_t state = pc->state64;
      49             : 
      50           0 :     if (!s->header_size) {
      51           0 :         for (i = 0; i < buf_size; i++) {
      52           0 :             state = (state << 8) | buf[i];
      53             :             /* check for fixed fields in ADX header for possible match */
      54           0 :             if ((state & 0xFFFF0000FFFFFF00) == 0x8000000003120400ULL) {
      55           0 :                 int channels    = state & 0xFF;
      56           0 :                 int header_size = ((state >> 32) & 0xFFFF) + 4;
      57           0 :                 if (channels > 0 && header_size >= 8) {
      58           0 :                     s->header_size = header_size;
      59           0 :                     s->block_size  = BLOCK_SIZE * channels;
      60           0 :                     s->remaining   = i - 7 + s->header_size + s->block_size;
      61           0 :                     break;
      62             :                 }
      63             :             }
      64             :         }
      65           0 :         pc->state64 = state;
      66             :     }
      67             : 
      68           0 :     if (s->header_size) {
      69           0 :         if (!s->remaining)
      70           0 :             s->remaining = s->block_size;
      71           0 :         if (s->remaining <= buf_size) {
      72           0 :             next = s->remaining;
      73           0 :             s->remaining = 0;
      74             :         } else
      75           0 :             s->remaining -= buf_size;
      76             :     }
      77             : 
      78           0 :     if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) {
      79           0 :         *poutbuf      = NULL;
      80           0 :         *poutbuf_size = 0;
      81           0 :         return buf_size;
      82             :     }
      83             : 
      84           0 :     s1->duration = BLOCK_SAMPLES;
      85             : 
      86           0 :     *poutbuf = buf;
      87           0 :     *poutbuf_size = buf_size;
      88           0 :     return next;
      89             : }
      90             : 
      91             : AVCodecParser ff_adx_parser = {
      92             :     .codec_ids      = { AV_CODEC_ID_ADPCM_ADX },
      93             :     .priv_data_size = sizeof(ADXParseContext),
      94             :     .parser_parse   = adx_parse,
      95             :     .parser_close   = ff_parse_close,
      96             : };

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