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id3v2 writer

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patch by Andreas Öman andreas olebyn nu
original thread: [FFmpeg-devel] [Ffmpeg-devel] ID3v2

Originally committed as revision 9102 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Andreas Öman 2007-05-22 08:28:32 +00:00 committed by Benoit Fouet
parent 52b53f8653
commit 0dc56bfae0
1 changed files with 56 additions and 0 deletions
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56
libavformat/mp3.c
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@ -498,8 +498,64 @@ static int mp3_read_close(AVFormatContext *s)
#ifdef CONFIG_MUXERS
/* simple formats */
static void id3v2_put_size(AVFormatContext *s, int size)
{
put_byte(&s->pb, size >> 21 & 0x7f);
put_byte(&s->pb, size >> 14 & 0x7f);
put_byte(&s->pb, size >> 7 & 0x7f);
put_byte(&s->pb, size & 0x7f);
}
static void id3v2_put_ttag(AVFormatContext *s, char *string, uint32_t tag)
{
int len = strlen(string);
put_be32(&s->pb, tag);
id3v2_put_size(s, len + 1);
put_be16(&s->pb, 0);
put_byte(&s->pb, 3); /* UTF-8 */
put_buffer(&s->pb, string, len);
}
/**
* Write an ID3v2.4 header at beginning of stream
*/
static int mp3_write_header(struct AVFormatContext *s)
{
int totlen = 0;
char tracktxt[10];
if(s->track)
snprintf(tracktxt, sizeof(tracktxt) - 1, "%d", s->track);
if(s->title[0]) totlen += 11 + strlen(s->title);
if(s->author[0]) totlen += 11 + strlen(s->author);
if(s->album[0]) totlen += 11 + strlen(s->album);
if(s->genre[0]) totlen += 11 + strlen(s->genre);
if(s->copyright[0]) totlen += 11 + strlen(s->copyright);
if(s->track) totlen += 11 + strlen(tracktxt);
if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
totlen += strlen(LIBAVFORMAT_IDENT) + 11;
if(totlen == 0)
return 0;
put_be32(&s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
put_byte(&s->pb, 0);
put_byte(&s->pb, 0); /* flags */
id3v2_put_size(s, totlen);
if(s->title[0]) id3v2_put_ttag(s, s->title, MKBETAG('T', 'I', 'T', '2'));
if(s->author[0]) id3v2_put_ttag(s, s->author, MKBETAG('T', 'P', 'E', '1'));
if(s->album[0]) id3v2_put_ttag(s, s->album, MKBETAG('T', 'A', 'L', 'B'));
if(s->genre[0]) id3v2_put_ttag(s, s->genre, MKBETAG('T', 'C', 'O', 'N'));
if(s->copyright[0]) id3v2_put_ttag(s, s->copyright, MKBETAG('T', 'C', 'O', 'P'));
if(s->track) id3v2_put_ttag(s, tracktxt, MKBETAG('T', 'R', 'C', 'K'));
if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
id3v2_put_ttag(s, LIBAVFORMAT_IDENT, MKBETAG('T', 'E', 'N', 'C'));
return 0;
}