| /* |
| * iLBC storage file format |
| * Copyright (c) 2012 Martin Storsjo |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "avformat.h" |
| #include "internal.h" |
| #include "rawenc.h" |
| |
| static const char mode20_header[] = "#!iLBC20\n"; |
| static const char mode30_header[] = "#!iLBC30\n"; |
| |
| static int ilbc_write_header(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| AVCodecParameters *par; |
| |
| if (s->nb_streams != 1) { |
| av_log(s, AV_LOG_ERROR, "Unsupported number of streams\n"); |
| return AVERROR(EINVAL); |
| } |
| par = s->streams[0]->codecpar; |
| |
| if (par->codec_id != AV_CODEC_ID_ILBC) { |
| av_log(s, AV_LOG_ERROR, "Unsupported codec\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| if (par->block_align == 50) { |
| avio_write(pb, mode30_header, sizeof(mode30_header) - 1); |
| } else if (par->block_align == 38) { |
| avio_write(pb, mode20_header, sizeof(mode20_header) - 1); |
| } else { |
| av_log(s, AV_LOG_ERROR, "Unsupported mode\n"); |
| return AVERROR(EINVAL); |
| } |
| return 0; |
| } |
| |
| static int ilbc_probe(const AVProbeData *p) |
| { |
| // Only check for "#!iLBC" which matches both formats |
| if (!memcmp(p->buf, mode20_header, 6)) |
| return AVPROBE_SCORE_MAX; |
| else |
| return 0; |
| } |
| |
| static int ilbc_read_header(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| AVStream *st; |
| uint8_t header[9]; |
| |
| avio_read(pb, header, 9); |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| st->codecpar->codec_id = AV_CODEC_ID_ILBC; |
| st->codecpar->sample_rate = 8000; |
| st->codecpar->channels = 1; |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->start_time = 0; |
| avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
| if (!memcmp(header, mode20_header, sizeof(mode20_header) - 1)) { |
| st->codecpar->block_align = 38; |
| st->codecpar->bit_rate = 15200; |
| } else if (!memcmp(header, mode30_header, sizeof(mode30_header) - 1)) { |
| st->codecpar->block_align = 50; |
| st->codecpar->bit_rate = 13333; |
| } else { |
| av_log(s, AV_LOG_ERROR, "Unrecognized iLBC file header\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| return 0; |
| } |
| |
| static int ilbc_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| AVCodecParameters *par = s->streams[0]->codecpar; |
| int ret; |
| |
| if ((ret = av_new_packet(pkt, par->block_align)) < 0) |
| return ret; |
| |
| pkt->stream_index = 0; |
| pkt->pos = avio_tell(s->pb); |
| pkt->duration = par->block_align == 38 ? 160 : 240; |
| if ((ret = avio_read(s->pb, pkt->data, par->block_align)) != par->block_align) { |
| return ret < 0 ? ret : AVERROR(EIO); |
| } |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_ilbc_demuxer = { |
| .name = "ilbc", |
| .long_name = NULL_IF_CONFIG_SMALL("iLBC storage"), |
| .read_probe = ilbc_probe, |
| .read_header = ilbc_read_header, |
| .read_packet = ilbc_read_packet, |
| .flags = AVFMT_GENERIC_INDEX, |
| }; |
| |
| #if CONFIG_ILBC_MUXER |
| AVOutputFormat ff_ilbc_muxer = { |
| .name = "ilbc", |
| .long_name = NULL_IF_CONFIG_SMALL("iLBC storage"), |
| .mime_type = "audio/iLBC", |
| .extensions = "lbc", |
| .audio_codec = AV_CODEC_ID_ILBC, |
| .write_header = ilbc_write_header, |
| .write_packet = ff_raw_write_packet, |
| .flags = AVFMT_NOTIMESTAMPS, |
| }; |
| #endif |