mirror of
https://github.com/nyanmisaka/ffmpeg-rockchip.git
synced 2025-11-01 04:53:04 +08:00
a78f136f3f
This avoids unnecessary rebuilds of most source files if only the list of enabled components has changed, but not the other properties of the build, set in config.h. Signed-off-by: Martin Storsjö <martin@martin.st>
134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
/*
|
|
* 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 "config_components.h"
|
|
|
|
#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->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
|
|
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_get_packet(s->pb, pkt, par->block_align)) != par->block_align)
|
|
return ret < 0 ? ret : AVERROR_INVALIDDATA;
|
|
|
|
pkt->stream_index = 0;
|
|
pkt->duration = par->block_align == 38 ? 160 : 240;
|
|
|
|
return 0;
|
|
}
|
|
|
|
const 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
|
|
const 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
|