LCOV - code coverage report
Current view: top level - src/libavformat - aacdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 42 45 93.3 %
Date: 2017-04-28 19:02:26 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * raw ADTS AAC demuxer
       3             :  * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
       4             :  * Copyright (c) 2009 Robert Swain ( rob opendot cl )
       5             :  *
       6             :  * This file is part of FFmpeg.
       7             :  *
       8             :  * FFmpeg is free software; you can redistribute it and/or
       9             :  * modify it under the terms of the GNU Lesser General Public
      10             :  * License as published by the Free Software Foundation; either
      11             :  * version 2.1 of the License, or (at your option) any later version.
      12             :  *
      13             :  * FFmpeg is distributed in the hope that it will be useful,
      14             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16             :  * Lesser General Public License for more details.
      17             :  *
      18             :  * You should have received a copy of the GNU Lesser General Public
      19             :  * License along with FFmpeg; if not, write to the Free Software
      20             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      21             :  */
      22             : 
      23             : #include "libavutil/intreadwrite.h"
      24             : #include "avformat.h"
      25             : #include "internal.h"
      26             : #include "rawdec.h"
      27             : #include "id3v1.h"
      28             : #include "apetag.h"
      29             : 
      30        5949 : static int adts_aac_probe(AVProbeData *p)
      31             : {
      32        5949 :     int max_frames = 0, first_frames = 0;
      33             :     int fsize, frames;
      34        5949 :     const uint8_t *buf0 = p->buf;
      35             :     const uint8_t *buf2;
      36             :     const uint8_t *buf;
      37        5949 :     const uint8_t *end = buf0 + p->buf_size - 7;
      38             : 
      39        5949 :     buf = buf0;
      40             : 
      41    83848985 :     for (; buf < end; buf = buf2 + 1) {
      42    83843036 :         buf2 = buf;
      43             : 
      44    83856363 :         for (frames = 0; buf2 < end; frames++) {
      45    83854650 :             uint32_t header = AV_RB16(buf2);
      46    83854650 :             if ((header & 0xFFF6) != 0xFFF0) {
      47    83841170 :                 if (buf != buf0) {
      48             :                     // Found something that isn't an ADTS header, starting
      49             :                     // from a position other than the start of the buffer.
      50             :                     // Discard the count we've accumulated so far since it
      51             :                     // probably was a false positive.
      52    83835251 :                     frames = 0;
      53             :                 }
      54    83841170 :                 break;
      55             :             }
      56       13480 :             fsize = (AV_RB32(buf2 + 3) >> 13) & 0x1FFF;
      57       13480 :             if (fsize < 7)
      58         153 :                 break;
      59       13327 :             fsize = FFMIN(fsize, end - buf2);
      60       13327 :             buf2 += fsize;
      61             :         }
      62    83843036 :         max_frames = FFMAX(max_frames, frames);
      63    83843036 :         if (buf == buf0)
      64        5949 :             first_frames = frames;
      65             :     }
      66             : 
      67        5949 :     if (first_frames >= 3)
      68          28 :         return AVPROBE_SCORE_EXTENSION + 1;
      69        5921 :     else if (max_frames > 100)
      70           0 :         return AVPROBE_SCORE_EXTENSION;
      71        5921 :     else if (max_frames >= 3)
      72           0 :         return AVPROBE_SCORE_EXTENSION / 2;
      73        5921 :     else if (first_frames >= 1)
      74           2 :         return 1;
      75             :     else
      76        5919 :         return 0;
      77             : }
      78             : 
      79          29 : static int adts_aac_read_header(AVFormatContext *s)
      80             : {
      81             :     AVStream *st;
      82             : 
      83          29 :     st = avformat_new_stream(s, NULL);
      84          29 :     if (!st)
      85           0 :         return AVERROR(ENOMEM);
      86             : 
      87          29 :     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
      88          29 :     st->codecpar->codec_id   = s->iformat->raw_codec_id;
      89          29 :     st->need_parsing         = AVSTREAM_PARSE_FULL_RAW;
      90             : 
      91          29 :     ff_id3v1_read(s);
      92          58 :     if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&
      93          29 :         !av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
      94          29 :         int64_t cur = avio_tell(s->pb);
      95          29 :         ff_ape_parse_tag(s);
      96          29 :         avio_seek(s->pb, cur, SEEK_SET);
      97             :     }
      98             : 
      99             :     // LCM of all possible ADTS sample rates
     100          29 :     avpriv_set_pts_info(st, 64, 1, 28224000);
     101             : 
     102          29 :     return 0;
     103             : }
     104             : 
     105             : AVInputFormat ff_aac_demuxer = {
     106             :     .name         = "aac",
     107             :     .long_name    = NULL_IF_CONFIG_SMALL("raw ADTS AAC (Advanced Audio Coding)"),
     108             :     .read_probe   = adts_aac_probe,
     109             :     .read_header  = adts_aac_read_header,
     110             :     .read_packet  = ff_raw_read_partial_packet,
     111             :     .flags        = AVFMT_GENERIC_INDEX,
     112             :     .extensions   = "aac",
     113             :     .mime_type    = "audio/aac,audio/aacp,audio/x-aac",
     114             :     .raw_codec_id = AV_CODEC_ID_AAC,
     115             : };

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