LCOV - code coverage report
Current view: top level - libavformat - apc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 30 34 88.2 %
Date: 2017-12-12 11:08:38 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * CRYO APC audio format demuxer
       3             :  * Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com>
       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 Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include <string.h>
      23             : 
      24             : #include "libavutil/channel_layout.h"
      25             : #include "avformat.h"
      26             : #include "internal.h"
      27             : 
      28        6130 : static int apc_probe(AVProbeData *p)
      29             : {
      30        6130 :     if (!strncmp(p->buf, "CRYO_APC", 8))
      31           1 :         return AVPROBE_SCORE_MAX;
      32             : 
      33        6129 :     return 0;
      34             : }
      35             : 
      36           1 : static int apc_read_header(AVFormatContext *s)
      37             : {
      38           1 :     AVIOContext *pb = s->pb;
      39             :     AVStream *st;
      40             : 
      41           1 :     avio_rl32(pb); /* CRYO */
      42           1 :     avio_rl32(pb); /* _APC */
      43           1 :     avio_rl32(pb); /* 1.20 */
      44             : 
      45           1 :     st = avformat_new_stream(s, NULL);
      46           1 :     if (!st)
      47           0 :         return AVERROR(ENOMEM);
      48             : 
      49           1 :     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
      50           1 :     st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_APC;
      51             : 
      52           1 :     avio_rl32(pb); /* number of samples */
      53           1 :     st->codecpar->sample_rate = avio_rl32(pb);
      54             : 
      55             :     /* initial predictor values for adpcm decoder */
      56           1 :     if (ff_get_extradata(s, st->codecpar, pb, 2 * 4) < 0)
      57           0 :         return AVERROR(ENOMEM);
      58             : 
      59           1 :     if (avio_rl32(pb)) {
      60           1 :         st->codecpar->channels       = 2;
      61           1 :         st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
      62             :     } else {
      63           0 :         st->codecpar->channels       = 1;
      64           0 :         st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
      65             :     }
      66             : 
      67           1 :     st->codecpar->bits_per_coded_sample = 4;
      68           3 :     st->codecpar->bit_rate = (int64_t)st->codecpar->bits_per_coded_sample * st->codecpar->channels
      69           2 :                           * st->codecpar->sample_rate;
      70           1 :     st->codecpar->block_align = 1;
      71             : 
      72           1 :     return 0;
      73             : }
      74             : 
      75             : #define MAX_READ_SIZE 4096
      76             : 
      77         180 : static int apc_read_packet(AVFormatContext *s, AVPacket *pkt)
      78             : {
      79         180 :     if (av_get_packet(s->pb, pkt, MAX_READ_SIZE) <= 0)
      80           1 :         return AVERROR(EIO);
      81         179 :     pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
      82         179 :     pkt->stream_index = 0;
      83         179 :     return 0;
      84             : }
      85             : 
      86             : AVInputFormat ff_apc_demuxer = {
      87             :     .name           = "apc",
      88             :     .long_name      = NULL_IF_CONFIG_SMALL("CRYO APC"),
      89             :     .read_probe     = apc_probe,
      90             :     .read_header    = apc_read_header,
      91             :     .read_packet    = apc_read_packet,
      92             : };

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