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mp3enc: allow omitting the id3v2 header with -id3v2_version 0

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This commit is contained in:
Anton Khirnov 2014-01-14 22:06:03 +01:00
parent f9cc6883a4
commit 33018907bd
3 changed files with 33 additions and 9 deletions
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11
doc/muxers.texi
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@ -434,8 +434,10 @@ avconv -i in.mkv -c copy -map 0 -f segment -list out.list out%03d.nut
The MP3 muxer writes a raw MP3 stream with an ID3v2 header at the beginning and
optionally an ID3v1 tag at the end. ID3v2.3 and ID3v2.4 are supported, the
@code{id3v2_version} option controls which one is used. The legacy ID3v1 tag is
not written by default, but may be enabled with the @code{write_id3v1} option.
@code{id3v2_version} option controls which one is used. Setting
@code{id3v2_version} to 0 will disable the ID3v2 header completely. The legacy
ID3v1 tag is not written by default, but may be enabled with the
@code{write_id3v1} option.
The muxer may also write a Xing frame at the beginning, which contains the
number of frames in the file. It is useful for computing duration of VBR files.
@ -466,6 +468,11 @@ avconv -i input.mp3 -i cover.png -c copy -metadata:s:v title="Album cover"
-metadata:s:v comment="Cover (Front)" out.mp3
@end example
Write a "clean" MP3 without any extra features:
@example
avconv -i input.wav -write_xing 0 -id3v2_version 0 out.mp3
@end example
@section ogg
Ogg container muxer.

29
libavformat/mp3enc.c
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@ -319,7 +319,7 @@ AVOutputFormat ff_mp2_muxer = {
static const AVOption options[] = {
{ "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",
offsetof(MP3Context, id3v2_version), AV_OPT_TYPE_INT, {.i64 = 4}, 3, 4, AV_OPT_FLAG_ENCODING_PARAM},
offsetof(MP3Context, id3v2_version), AV_OPT_TYPE_INT, {.i64 = 4}, 0, 4, AV_OPT_FLAG_ENCODING_PARAM},
{ "write_id3v1", "Enable ID3v1 writing. ID3v1 tags are written in UTF-8 which may not be supported by most software.",
offsetof(MP3Context, write_id3v1), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
{ "write_xing", "Write the Xing header containing file duration.",
@ -392,6 +392,14 @@ static int mp3_write_header(struct AVFormatContext *s)
MP3Context *mp3 = s->priv_data;
int ret, i;
if (mp3->id3v2_version &&
mp3->id3v2_version != 3 &&
mp3->id3v2_version != 4) {
av_log(s, AV_LOG_ERROR, "Invalid ID3v2 version requested: %d. Only "
"3, 4 or 0 (disabled) are allowed.\n", mp3->id3v2_version);
return AVERROR(EINVAL);
}
/* check the streams -- we want exactly one audio and arbitrary number of
* video (attached pictures) */
mp3->audio_stream_idx = -1;
@ -415,13 +423,22 @@ static int mp3_write_header(struct AVFormatContext *s)
}
mp3->pics_to_write = s->nb_streams - 1;
ff_id3v2_start(&mp3->id3, s->pb, mp3->id3v2_version, ID3v2_DEFAULT_MAGIC);
ret = ff_id3v2_write_metadata(s, &mp3->id3);
if (ret < 0)
return ret;
if (mp3->pics_to_write && !mp3->id3v2_version) {
av_log(s, AV_LOG_ERROR, "Attached pictures were requested, but the "
"ID3v2 header is disabled.\n");
return AVERROR(EINVAL);
}
if (mp3->id3v2_version) {
ff_id3v2_start(&mp3->id3, s->pb, mp3->id3v2_version, ID3v2_DEFAULT_MAGIC);
ret = ff_id3v2_write_metadata(s, &mp3->id3);
if (ret < 0)
return ret;
}
if (!mp3->pics_to_write) {
ff_id3v2_finish(&mp3->id3, s->pb);
if (mp3->id3v2_version)
ff_id3v2_finish(&mp3->id3, s->pb);
mp3_write_xing(s);
}

2
libavformat/version.h
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@ -31,7 +31,7 @@
#define LIBAVFORMAT_VERSION_MAJOR 55
#define LIBAVFORMAT_VERSION_MINOR 10
#define LIBAVFORMAT_VERSION_MICRO 2
#define LIBAVFORMAT_VERSION_MICRO 3
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \