f4167842c1
More exactly: Not more than one stream of each type for which a default codec (i.e. AVOutputFormat.(audio|video|subtitle)_codec) is set; for those types for which no such codec is set (or for which no designated default codec in AVOutputFormat exists at all) no streams are permitted. Given that with this flag set the default codecs become more important, they are now set explicitly to AV_CODEC_ID_NONE for "unset"; the earlier code relied on AV_CODEC_ID_NONE being equal to zero, so that default static initialization set it accordingly; but this is not how one is supposed to use an enum. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
133 lines
4.0 KiB
C
133 lines
4.0 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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "config_components.h"
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#include "avformat.h"
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#include "demux.h"
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#include "internal.h"
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#include "mux.h"
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#include "rawenc.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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AVCodecParameters *par = s->streams[0]->codecpar;
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if (par->codec_id != AV_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 (par->block_align == 50) {
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avio_write(pb, mode30_header, sizeof(mode30_header) - 1);
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} else if (par->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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return 0;
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}
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static int ilbc_probe(const 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->codecpar->codec_id = AV_CODEC_ID_ILBC;
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st->codecpar->sample_rate = 8000;
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st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
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st->codecpar->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->codecpar->sample_rate);
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if (!memcmp(header, mode20_header, sizeof(mode20_header) - 1)) {
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st->codecpar->block_align = 38;
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st->codecpar->bit_rate = 15200;
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} else if (!memcmp(header, mode30_header, sizeof(mode30_header) - 1)) {
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st->codecpar->block_align = 50;
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st->codecpar->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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AVCodecParameters *par = s->streams[0]->codecpar;
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int ret;
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if ((ret = av_get_packet(s->pb, pkt, par->block_align)) != par->block_align)
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return ret < 0 ? ret : AVERROR_INVALIDDATA;
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pkt->stream_index = 0;
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pkt->duration = par->block_align == 38 ? 160 : 240;
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return 0;
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}
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const FFInputFormat ff_ilbc_demuxer = {
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.p.name = "ilbc",
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.p.long_name = NULL_IF_CONFIG_SMALL("iLBC storage"),
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.p.flags = AVFMT_GENERIC_INDEX,
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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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};
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#if CONFIG_ILBC_MUXER
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const FFOutputFormat ff_ilbc_muxer = {
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.p.name = "ilbc",
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.p.long_name = NULL_IF_CONFIG_SMALL("iLBC storage"),
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.p.mime_type = "audio/iLBC",
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.p.extensions = "lbc",
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.p.video_codec = AV_CODEC_ID_NONE,
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.p.audio_codec = AV_CODEC_ID_ILBC,
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.p.subtitle_codec = AV_CODEC_ID_NONE,
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.p.flags = AVFMT_NOTIMESTAMPS,
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.flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH,
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.write_header = ilbc_write_header,
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.write_packet = ff_raw_write_packet,
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};
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#endif
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