ffmpeg/libavformat/au.c

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/*
* AU muxer and demuxer
* Copyright (c) 2001 Fabrice Bellard
*
* first version by Francois Revol <revol@free.fr>
*
* 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
*/
/*
* Reference documents:
* http://www.opengroup.org/public/pubs/external/auformat.html
* http://www.goice.co.jp/member/mo/formats/au.html
*/
#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"
#include "pcm.h"
#include "libavutil/avassert.h"
/* if we don't know the size in advance */
#define AU_UNKNOWN_SIZE ((uint32_t)(~0))
/* the specification requires an annotation field of at least eight bytes */
#define AU_DEFAULT_HEADER_SIZE (24+8)
static const AVCodecTag codec_au_tags[] = {
{ AV_CODEC_ID_PCM_MULAW, 1 },
{ AV_CODEC_ID_PCM_S8, 2 },
{ AV_CODEC_ID_PCM_S16BE, 3 },
{ AV_CODEC_ID_PCM_S24BE, 4 },
{ AV_CODEC_ID_PCM_S32BE, 5 },
{ AV_CODEC_ID_PCM_F32BE, 6 },
{ AV_CODEC_ID_PCM_F64BE, 7 },
{ AV_CODEC_ID_ADPCM_G726LE, 23 },
{ AV_CODEC_ID_ADPCM_G722,24 },
{ AV_CODEC_ID_ADPCM_G726LE, 25 },
{ AV_CODEC_ID_ADPCM_G726LE, 26 },
{ AV_CODEC_ID_PCM_ALAW, 27 },
{ AV_CODEC_ID_ADPCM_G726LE, MKBETAG('7','2','6','2') },
{ AV_CODEC_ID_NONE, 0 },
};
#if CONFIG_AU_DEMUXER
static int au_probe(const AVProbeData *p)
{
if (p->buf[0] == '.' && p->buf[1] == 's' &&
p->buf[2] == 'n' && p->buf[3] == 'd')
return AVPROBE_SCORE_MAX;
else
return 0;
}
static int au_read_annotation(AVFormatContext *s, int size)
{
static const char * keys[] = {
"title",
"artist",
"album",
"track",
"genre",
NULL };
AVIOContext *pb = s->pb;
enum { PARSE_KEY, PARSE_VALUE, PARSE_FINISHED } state = PARSE_KEY;
char c;
AVBPrint bprint;
char * key = NULL;
char * value = NULL;
int i;
av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
while (size-- > 0) {
c = avio_r8(pb);
switch(state) {
case PARSE_KEY:
if (c == '\0') {
state = PARSE_FINISHED;
} else if (c == '=') {
av_bprint_finalize(&bprint, &key);
av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
state = PARSE_VALUE;
} else {
av_bprint_chars(&bprint, c, 1);
}
break;
case PARSE_VALUE:
if (c == '\0' || c == '\n') {
if (av_bprint_finalize(&bprint, &value) != 0) {
av_log(s, AV_LOG_ERROR, "Memory error while parsing AU metadata.\n");
} else {
av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
for (i = 0; keys[i] != NULL && key != NULL; i++) {
if (av_strcasecmp(keys[i], key) == 0) {
av_dict_set(&(s->metadata), keys[i], value, AV_DICT_DONT_STRDUP_VAL);
av_freep(&key);
value = NULL;
}
}
}
av_freep(&key);
av_freep(&value);
state = (c == '\0') ? PARSE_FINISHED : PARSE_KEY;
} else {
av_bprint_chars(&bprint, c, 1);
}
break;
case PARSE_FINISHED:
break;
default:
/* should never happen */
av_assert0(0);
}
}
av_bprint_finalize(&bprint, NULL);
av_freep(&key);
return 0;
}
#define BLOCK_SIZE 1024
static int au_read_header(AVFormatContext *s)
{
int size, data_size = 0;
unsigned int tag;
AVIOContext *pb = s->pb;
unsigned int id, channels, rate;
int bps, ba = 0;
enum AVCodecID codec;
AVStream *st;
tag = avio_rl32(pb);
if (tag != MKTAG('.', 's', 'n', 'd'))
return AVERROR_INVALIDDATA;
size = avio_rb32(pb); /* header size */
data_size = avio_rb32(pb); /* data size in bytes */
if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
return AVERROR_INVALIDDATA;
}
id = avio_rb32(pb);
rate = avio_rb32(pb);
channels = avio_rb32(pb);
if (size > 24) {
/* parse annotation field to get metadata */
au_read_annotation(s, size - 24);
}
codec = ff_codec_get_id(codec_au_tags, id);
if (codec == AV_CODEC_ID_NONE) {
avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
return AVERROR_PATCHWELCOME;
}
bps = av_get_bits_per_sample(codec);
if (codec == AV_CODEC_ID_ADPCM_G726LE) {
if (id == MKBETAG('7','2','6','2')) {
bps = 2;
} else {
const uint8_t bpcss[] = {4, 0, 3, 5};
av_assert0(id >= 23 && id < 23 + 4);
ba = bpcss[id - 23];
bps = bpcss[id - 23];
}
} else if (!bps) {
avpriv_request_sample(s, "Unknown bits per sample");
return AVERROR_PATCHWELCOME;
}
if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
return AVERROR_INVALIDDATA;
}
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if (rate == 0 || rate > INT_MAX) {
av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
return AVERROR_INVALIDDATA;
}
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
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;
st->codecpar->codec_tag = id;
st->codecpar->codec_id = codec;
st->codecpar->channels = channels;
st->codecpar->sample_rate = rate;
st->codecpar->bits_per_coded_sample = bps;
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->bit_rate = channels * rate * bps;
st->codecpar->block_align = ba ? ba : FFMAX(bps * st->codecpar->channels / 8, 1);
if (data_size != AU_UNKNOWN_SIZE)
st->duration = (((int64_t)data_size)<<3) / (st->codecpar->channels * (int64_t)bps);
st->start_time = 0;
avpriv_set_pts_info(st, 64, 1, rate);
return 0;
}
AVInputFormat ff_au_demuxer = {
.name = "au",
.long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
.read_probe = au_probe,
.read_header = au_read_header,
.read_packet = ff_pcm_read_packet,
.read_seek = ff_pcm_read_seek,
.codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
};
#endif /* CONFIG_AU_DEMUXER */
#if CONFIG_AU_MUXER
typedef struct AUContext {
uint32_t header_size;
} AUContext;
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#include "rawenc.h"
static int au_get_annotations(AVFormatContext *s, char **buffer)
{
static const char * keys[] = {
"Title",
"Artist",
"Album",
"Track",
"Genre",
NULL };
int i;
int cnt = 0;
AVDictionary *m = s->metadata;
AVDictionaryEntry *t = NULL;
AVBPrint bprint;
av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
for (i = 0; keys[i] != NULL; i++) {
t = av_dict_get(m, keys[i], NULL, 0);
if (t != NULL) {
if (cnt++)
av_bprint_chars(&bprint, '\n', 1);
av_bprint_append_data(&bprint, keys[i], strlen(keys[i]));
av_bprint_chars(&bprint, '=', 1);
av_bprint_append_data(&bprint, t->value, strlen(t->value));
}
}
/* pad with 0's */
av_bprint_append_data(&bprint, "\0\0\0\0\0\0\0\0", 8);
return av_bprint_finalize(&bprint, buffer);
}
static int au_write_header(AVFormatContext *s)
{
int ret;
AUContext *au = s->priv_data;
AVIOContext *pb = s->pb;
AVCodecParameters *par = s->streams[0]->codecpar;
char *annotations = NULL;
au->header_size = AU_DEFAULT_HEADER_SIZE;
if (s->nb_streams != 1) {
av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
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return AVERROR(EINVAL);
}
par->codec_tag = ff_codec_get_tag(codec_au_tags, par->codec_id);
if (!par->codec_tag) {
av_log(s, AV_LOG_ERROR, "unsupported codec\n");
return AVERROR(EINVAL);
}
if (av_dict_count(s->metadata) > 0) {
ret = au_get_annotations(s, &annotations);
if (ret < 0)
return ret;
if (annotations != NULL) {
au->header_size = (24 + strlen(annotations) + 8) & ~7;
if (au->header_size < AU_DEFAULT_HEADER_SIZE)
au->header_size = AU_DEFAULT_HEADER_SIZE;
}
}
ffio_wfourcc(pb, ".snd"); /* magic number */
avio_wb32(pb, au->header_size); /* header size */
avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
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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avio_wb32(pb, par->codec_tag); /* codec ID */
avio_wb32(pb, par->sample_rate);
avio_wb32(pb, par->channels);
if (annotations != NULL) {
avio_write(pb, annotations, au->header_size - 24);
av_freep(&annotations);
} else {
avio_wb64(pb, 0); /* annotation field */
}
avio_flush(pb);
return 0;
}
static int au_write_trailer(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
AUContext *au = s->priv_data;
int64_t file_size = avio_tell(pb);
if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && file_size < INT32_MAX) {
/* update file size */
avio_seek(pb, 8, SEEK_SET);
avio_wb32(pb, (uint32_t)(file_size - au->header_size));
avio_seek(pb, file_size, SEEK_SET);
avio_flush(pb);
}
return 0;
}
AVOutputFormat ff_au_muxer = {
.name = "au",
.long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
.mime_type = "audio/basic",
.extensions = "au",
.priv_data_size = sizeof(AUContext),
.audio_codec = AV_CODEC_ID_PCM_S16BE,
.video_codec = AV_CODEC_ID_NONE,
.write_header = au_write_header,
.write_packet = ff_raw_write_packet,
.write_trailer = au_write_trailer,
.codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
.flags = AVFMT_NOTIMESTAMPS,
};
#endif /* CONFIG_AU_MUXER */