mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-14 21:35:06 +02:00
![Michael Niedermayer](/assets/img/avatar_default.png)
* commit 'f792d3cbb8e8e35c54a9358a55dd596b7a40f228': lavf: add the notimestamps flag to the muxers missing it Conflicts: libavformat/adtsenc.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
190 lines
5.3 KiB
C
190 lines
5.3 KiB
C
/*
|
|
* amr file format
|
|
* Copyright (c) 2001 ffmpeg project
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/*
|
|
Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267
|
|
|
|
Only mono files are supported.
|
|
|
|
*/
|
|
|
|
#include "libavutil/channel_layout.h"
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
typedef struct {
|
|
uint64_t cumulated_size;
|
|
uint64_t block_count;
|
|
} AMRContext;
|
|
|
|
static const char AMR_header[] = "#!AMR\n";
|
|
static const char AMRWB_header[] = "#!AMR-WB\n";
|
|
|
|
#if CONFIG_AMR_MUXER
|
|
static int amr_write_header(AVFormatContext *s)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
AVCodecContext *enc = s->streams[0]->codec;
|
|
|
|
s->priv_data = NULL;
|
|
|
|
if (enc->codec_id == AV_CODEC_ID_AMR_NB) {
|
|
avio_write(pb, AMR_header, sizeof(AMR_header) - 1); /* magic number */
|
|
} else if (enc->codec_id == AV_CODEC_ID_AMR_WB) {
|
|
avio_write(pb, AMRWB_header, sizeof(AMRWB_header) - 1); /* magic number */
|
|
} else {
|
|
return -1;
|
|
}
|
|
avio_flush(pb);
|
|
return 0;
|
|
}
|
|
|
|
static int amr_write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
avio_write(s->pb, pkt->data, pkt->size);
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_AMR_MUXER */
|
|
|
|
static int amr_probe(AVProbeData *p)
|
|
{
|
|
// Only check for "#!AMR" which could be amr-wb, amr-nb.
|
|
// This will also trigger multichannel files: "#!AMR_MC1.0\n" and
|
|
// "#!AMR-WB_MC1.0\n" (not supported)
|
|
|
|
if (!memcmp(p->buf, AMR_header, 5))
|
|
return AVPROBE_SCORE_MAX;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/* amr input */
|
|
static int amr_read_header(AVFormatContext *s)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
AVStream *st;
|
|
uint8_t header[9];
|
|
|
|
avio_read(pb, header, 6);
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
if (memcmp(header, AMR_header, 6)) {
|
|
avio_read(pb, header + 6, 3);
|
|
if (memcmp(header, AMRWB_header, 9)) {
|
|
return -1;
|
|
}
|
|
|
|
st->codec->codec_tag = MKTAG('s', 'a', 'w', 'b');
|
|
st->codec->codec_id = AV_CODEC_ID_AMR_WB;
|
|
st->codec->sample_rate = 16000;
|
|
} else {
|
|
st->codec->codec_tag = MKTAG('s', 'a', 'm', 'r');
|
|
st->codec->codec_id = AV_CODEC_ID_AMR_NB;
|
|
st->codec->sample_rate = 8000;
|
|
}
|
|
st->codec->channels = 1;
|
|
st->codec->channel_layout = AV_CH_LAYOUT_MONO;
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int amr_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVCodecContext *enc = s->streams[0]->codec;
|
|
int read, size = 0, toc, mode;
|
|
int64_t pos = avio_tell(s->pb);
|
|
AMRContext *amr = s->priv_data;
|
|
|
|
if (url_feof(s->pb)) {
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
// FIXME this is wrong, this should rather be in a AVParser
|
|
toc = avio_r8(s->pb);
|
|
mode = (toc >> 3) & 0x0F;
|
|
|
|
if (enc->codec_id == AV_CODEC_ID_AMR_NB) {
|
|
static const uint8_t packed_size[16] = {
|
|
12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0
|
|
};
|
|
|
|
size = packed_size[mode] + 1;
|
|
} else if (enc->codec_id == AV_CODEC_ID_AMR_WB) {
|
|
static const uint8_t packed_size[16] = {
|
|
18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1
|
|
};
|
|
|
|
size = packed_size[mode];
|
|
}
|
|
|
|
if (!size || av_new_packet(pkt, size))
|
|
return AVERROR(EIO);
|
|
|
|
if (amr->cumulated_size < UINT64_MAX - size) {
|
|
amr->cumulated_size += size;
|
|
/* Both AMR formats have 50 frames per second */
|
|
s->streams[0]->codec->bit_rate = amr->cumulated_size / ++amr->block_count * 8 * 50;
|
|
}
|
|
|
|
pkt->stream_index = 0;
|
|
pkt->pos = pos;
|
|
pkt->data[0] = toc;
|
|
pkt->duration = enc->codec_id == AV_CODEC_ID_AMR_NB ? 160 : 320;
|
|
read = avio_read(s->pb, pkt->data + 1, size - 1);
|
|
|
|
if (read != size - 1) {
|
|
av_free_packet(pkt);
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if CONFIG_AMR_DEMUXER
|
|
AVInputFormat ff_amr_demuxer = {
|
|
.name = "amr",
|
|
.long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"),
|
|
.priv_data_size = sizeof(AMRContext),
|
|
.read_probe = amr_probe,
|
|
.read_header = amr_read_header,
|
|
.read_packet = amr_read_packet,
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
};
|
|
#endif
|
|
|
|
#if CONFIG_AMR_MUXER
|
|
AVOutputFormat ff_amr_muxer = {
|
|
.name = "amr",
|
|
.long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"),
|
|
.mime_type = "audio/amr",
|
|
.extensions = "amr",
|
|
.audio_codec = AV_CODEC_ID_AMR_NB,
|
|
.video_codec = AV_CODEC_ID_NONE,
|
|
.write_header = amr_write_header,
|
|
.write_packet = amr_write_packet,
|
|
.flags = AVFMT_NOTIMESTAMPS,
|
|
};
|
|
#endif
|