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FFmpeg/libavformat/amr.c

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/*
* 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
*/
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#include "config_components.h"
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#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "avio_internal.h"
#include "demux.h"
#include "internal.h"
#include "mux.h"
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#include "rawdec.h"
#include "rawenc.h"
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typedef struct AMRContext {
FFRawDemuxerContext rawctx;
} AMRContext;
static const uint8_t AMR_header[6] = "#!AMR\x0a";
static const uint8_t AMRMC_header[12] = "#!AMR_MC1.0\x0a";
static const uint8_t AMRWB_header[9] = "#!AMR-WB\x0a";
static const uint8_t AMRWBMC_header[15] = "#!AMR-WB_MC1.0\x0a";
static const uint8_t amrnb_packed_size[16] = {
13, 14, 16, 18, 20, 21, 27, 32, 6, 1, 1, 1, 1, 1, 1, 1
};
static const uint8_t amrwb_packed_size[16] = {
18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 1, 1, 1, 1, 1, 1
};
#if CONFIG_AMR_DEMUXER
static int amr_probe(const 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"
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[19] = { 0 };
int read, back = 0, ret;
ret = ffio_ensure_seekback(s->pb, sizeof(header));
if (ret < 0)
return ret;
read = avio_read(pb, header, sizeof(header));
if (read < 0)
return read;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
if (!memcmp(header, AMR_header, sizeof(AMR_header))) {
st->codecpar->codec_tag = MKTAG('s', 'a', 'm', 'r');
st->codecpar->codec_id = AV_CODEC_ID_AMR_NB;
st->codecpar->sample_rate = 8000;
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
back = read - sizeof(AMR_header);
} else if (!memcmp(header, AMRWB_header, sizeof(AMRWB_header))) {
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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st->codecpar->codec_tag = MKTAG('s', 'a', 'w', 'b');
st->codecpar->codec_id = AV_CODEC_ID_AMR_WB;
st->codecpar->sample_rate = 16000;
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
back = read - sizeof(AMRWB_header);
} else if (!memcmp(header, AMRMC_header, sizeof(AMRMC_header))) {
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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st->codecpar->codec_tag = MKTAG('s', 'a', 'm', 'r');
st->codecpar->codec_id = AV_CODEC_ID_AMR_NB;
st->codecpar->sample_rate = 8000;
st->codecpar->ch_layout.nb_channels = AV_RL32(header + 12);
back = read - 4 - sizeof(AMRMC_header);
} else if (!memcmp(header, AMRWBMC_header, sizeof(AMRWBMC_header))) {
st->codecpar->codec_tag = MKTAG('s', 'a', 'w', 'b');
st->codecpar->codec_id = AV_CODEC_ID_AMR_WB;
st->codecpar->sample_rate = 16000;
st->codecpar->ch_layout.nb_channels = AV_RL32(header + 15);
back = read - 4 - sizeof(AMRWBMC_header);
} else {
return AVERROR_INVALIDDATA;
}
if (st->codecpar->ch_layout.nb_channels < 1)
return AVERROR_INVALIDDATA;
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
if (back > 0)
avio_seek(pb, -back, SEEK_CUR);
return 0;
}
const FFInputFormat ff_amr_demuxer = {
.p.name = "amr",
.p.long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"),
.p.flags = AVFMT_GENERIC_INDEX,
.p.priv_class = &ff_raw_demuxer_class,
.priv_data_size = sizeof(AMRContext),
.read_probe = amr_probe,
.read_header = amr_read_header,
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.read_packet = ff_raw_read_partial_packet,
};
#endif
#if CONFIG_AMRNB_DEMUXER
static int amrnb_probe(const AVProbeData *p)
{
int mode, i = 0, valid = 0, invalid = 0;
const uint8_t *b = p->buf;
while (i < p->buf_size) {
mode = b[i] >> 3 & 0x0F;
if (mode < 9 && (b[i] & 0x4) == 0x4) {
int last = b[i];
int size = amrnb_packed_size[mode];
while (size--) {
if (b[++i] != last)
break;
}
if (size > 0) {
valid++;
i += size;
}
} else {
valid = 0;
invalid++;
i++;
}
}
if (valid > 100 && valid >> 4 > invalid)
return AVPROBE_SCORE_EXTENSION / 2 + 1;
return 0;
}
static int amrnb_read_header(AVFormatContext *s)
{
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_id = AV_CODEC_ID_AMR_NB;
st->codecpar->sample_rate = 8000;
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
avpriv_set_pts_info(st, 64, 1, 8000);
return 0;
}
const FFInputFormat ff_amrnb_demuxer = {
.p.name = "amrnb",
.p.long_name = NULL_IF_CONFIG_SMALL("raw AMR-NB"),
.p.flags = AVFMT_GENERIC_INDEX,
.p.priv_class = &ff_raw_demuxer_class,
.priv_data_size = sizeof(AMRContext),
.read_probe = amrnb_probe,
.read_header = amrnb_read_header,
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.read_packet = ff_raw_read_partial_packet,
};
#endif
#if CONFIG_AMRWB_DEMUXER
static int amrwb_probe(const AVProbeData *p)
{
int mode, i = 0, valid = 0, invalid = 0;
const uint8_t *b = p->buf;
while (i < p->buf_size) {
mode = b[i] >> 3 & 0x0F;
if (mode < 10 && (b[i] & 0x4) == 0x4) {
int last = b[i];
int size = amrwb_packed_size[mode];
while (size--) {
if (b[++i] != last)
break;
}
if (size > 0) {
valid++;
i += size;
}
} else {
valid = 0;
invalid++;
i++;
}
}
if (valid > 100 && valid >> 4 > invalid)
return AVPROBE_SCORE_EXTENSION / 2 + 1;
return 0;
}
static int amrwb_read_header(AVFormatContext *s)
{
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_id = AV_CODEC_ID_AMR_WB;
st->codecpar->sample_rate = 16000;
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
avpriv_set_pts_info(st, 64, 1, 16000);
return 0;
}
const FFInputFormat ff_amrwb_demuxer = {
.p.name = "amrwb",
.p.long_name = NULL_IF_CONFIG_SMALL("raw AMR-WB"),
.p.flags = AVFMT_GENERIC_INDEX,
.p.priv_class = &ff_raw_demuxer_class,
.priv_data_size = sizeof(AMRContext),
.read_probe = amrwb_probe,
.read_header = amrwb_read_header,
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.read_packet = ff_raw_read_partial_packet,
};
#endif
#if CONFIG_AMR_MUXER
static int amr_write_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
AVCodecParameters *par = s->streams[0]->codecpar;
if (par->codec_id == AV_CODEC_ID_AMR_NB) {
avio_write(pb, AMR_header, sizeof(AMR_header)); /* magic number */
} else if (par->codec_id == AV_CODEC_ID_AMR_WB) {
avio_write(pb, AMRWB_header, sizeof(AMRWB_header)); /* magic number */
} else {
return -1;
}
return 0;
}
const FFOutputFormat ff_amr_muxer = {
.p.name = "amr",
.p.long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"),
.p.mime_type = "audio/amr",
.p.extensions = "amr",
.p.audio_codec = AV_CODEC_ID_AMR_NB,
.p.video_codec = AV_CODEC_ID_NONE,
.p.subtitle_codec = AV_CODEC_ID_NONE,
.p.flags = AVFMT_NOTIMESTAMPS,
.flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH,
.write_header = amr_write_header,
.write_packet = ff_raw_write_packet,
};
#endif