LCOV - code coverage report
Current view: top level - libavformat - ilbc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 3 56 5.4 %
Date: 2017-12-17 11:58:42 Functions: 1 5 20.0 %

          Line data    Source code
       1             : /*
       2             :  * iLBC storage file format
       3             :  * Copyright (c) 2012 Martin Storsjo
       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 "avformat.h"
      23             : #include "internal.h"
      24             : 
      25             : static const char mode20_header[] = "#!iLBC20\n";
      26             : static const char mode30_header[] = "#!iLBC30\n";
      27             : 
      28           0 : static int ilbc_write_header(AVFormatContext *s)
      29             : {
      30           0 :     AVIOContext *pb = s->pb;
      31             :     AVCodecParameters *par;
      32             : 
      33           0 :     if (s->nb_streams != 1) {
      34           0 :         av_log(s, AV_LOG_ERROR, "Unsupported number of streams\n");
      35           0 :         return AVERROR(EINVAL);
      36             :     }
      37           0 :     par = s->streams[0]->codecpar;
      38             : 
      39           0 :     if (par->codec_id != AV_CODEC_ID_ILBC) {
      40           0 :         av_log(s, AV_LOG_ERROR, "Unsupported codec\n");
      41           0 :         return AVERROR(EINVAL);
      42             :     }
      43             : 
      44           0 :     if (par->block_align == 50) {
      45           0 :         avio_write(pb, mode30_header, sizeof(mode30_header) - 1);
      46           0 :     } else if (par->block_align == 38) {
      47           0 :         avio_write(pb, mode20_header, sizeof(mode20_header) - 1);
      48             :     } else {
      49           0 :         av_log(s, AV_LOG_ERROR, "Unsupported mode\n");
      50           0 :         return AVERROR(EINVAL);
      51             :     }
      52           0 :     avio_flush(pb);
      53           0 :     return 0;
      54             : }
      55             : 
      56           0 : static int ilbc_write_packet(AVFormatContext *s, AVPacket *pkt)
      57             : {
      58           0 :     avio_write(s->pb, pkt->data, pkt->size);
      59           0 :     return 0;
      60             : }
      61             : 
      62        6130 : static int ilbc_probe(AVProbeData *p)
      63             : {
      64             :     // Only check for "#!iLBC" which matches both formats
      65        6130 :     if (!memcmp(p->buf, mode20_header, 6))
      66           0 :         return AVPROBE_SCORE_MAX;
      67             :     else
      68        6130 :         return 0;
      69             : }
      70             : 
      71           0 : static int ilbc_read_header(AVFormatContext *s)
      72             : {
      73           0 :     AVIOContext *pb = s->pb;
      74             :     AVStream *st;
      75             :     uint8_t header[9];
      76             : 
      77           0 :     avio_read(pb, header, 9);
      78             : 
      79           0 :     st = avformat_new_stream(s, NULL);
      80           0 :     if (!st)
      81           0 :         return AVERROR(ENOMEM);
      82           0 :     st->codecpar->codec_id = AV_CODEC_ID_ILBC;
      83           0 :     st->codecpar->sample_rate = 8000;
      84           0 :     st->codecpar->channels = 1;
      85           0 :     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
      86           0 :     st->start_time = 0;
      87           0 :     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
      88           0 :     if (!memcmp(header, mode20_header, sizeof(mode20_header) - 1)) {
      89           0 :         st->codecpar->block_align = 38;
      90           0 :         st->codecpar->bit_rate = 15200;
      91           0 :     } else if (!memcmp(header, mode30_header, sizeof(mode30_header) - 1)) {
      92           0 :         st->codecpar->block_align = 50;
      93           0 :         st->codecpar->bit_rate = 13333;
      94             :     } else {
      95           0 :         av_log(s, AV_LOG_ERROR, "Unrecognized iLBC file header\n");
      96           0 :         return AVERROR_INVALIDDATA;
      97             :     }
      98             : 
      99           0 :     return 0;
     100             : }
     101             : 
     102           0 : static int ilbc_read_packet(AVFormatContext *s,
     103             :                           AVPacket *pkt)
     104             : {
     105           0 :     AVCodecParameters *par = s->streams[0]->codecpar;
     106             :     int ret;
     107             : 
     108           0 :     if ((ret = av_new_packet(pkt, par->block_align)) < 0)
     109           0 :         return ret;
     110             : 
     111           0 :     pkt->stream_index = 0;
     112           0 :     pkt->pos = avio_tell(s->pb);
     113           0 :     pkt->duration = par->block_align == 38 ? 160 : 240;
     114           0 :     if ((ret = avio_read(s->pb, pkt->data, par->block_align)) != par->block_align) {
     115           0 :         av_packet_unref(pkt);
     116           0 :         return ret < 0 ? ret : AVERROR(EIO);
     117             :     }
     118             : 
     119           0 :     return 0;
     120             : }
     121             : 
     122             : AVInputFormat ff_ilbc_demuxer = {
     123             :     .name         = "ilbc",
     124             :     .long_name    = NULL_IF_CONFIG_SMALL("iLBC storage"),
     125             :     .read_probe   = ilbc_probe,
     126             :     .read_header  = ilbc_read_header,
     127             :     .read_packet  = ilbc_read_packet,
     128             :     .flags        = AVFMT_GENERIC_INDEX,
     129             : };
     130             : 
     131             : AVOutputFormat ff_ilbc_muxer = {
     132             :     .name         = "ilbc",
     133             :     .long_name    = NULL_IF_CONFIG_SMALL("iLBC storage"),
     134             :     .mime_type    = "audio/iLBC",
     135             :     .extensions   = "lbc",
     136             :     .audio_codec  = AV_CODEC_ID_ILBC,
     137             :     .write_header = ilbc_write_header,
     138             :     .write_packet = ilbc_write_packet,
     139             :     .flags        = AVFMT_NOTIMESTAMPS,
     140             : };

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