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