[FFmpeg-devel] [PATCH 6/6] mp3enc: support for id3v2.3 tags using a per-muxer AVOption
Anton Khirnov
anton
Fri Jan 21 20:18:11 CET 2011
fixes issue2562.
---
libavformat/mp3enc.c | 48 +++++++++++++++++++++++++++++++++++++-----------
1 files changed, 37 insertions(+), 11 deletions(-)
diff --git a/libavformat/mp3enc.c b/libavformat/mp3enc.c
index 4a52e19..b239c99 100644
--- a/libavformat/mp3enc.c
+++ b/libavformat/mp3enc.c
@@ -24,6 +24,7 @@
#include "id3v1.h"
#include "id3v2.h"
#include "libavutil/intreadwrite.h"
+#include "libavutil/opt.h"
static int id3v1_set_string(AVFormatContext *s, const char *key,
uint8_t *buf, int buf_size)
@@ -86,7 +87,7 @@ static int id3v2_put_ttag(AVFormatContext *s, const char *str1, const char *str2
{
int len;
uint8_t *pb;
- void (*put)(ByteIOContext*, const char*) = avio_put_str;
+ int (*put)(ByteIOContext*, const char*) = avio_put_str;
ByteIOContext *dyn_buf;
if (url_open_dyn_buf(&dyn_buf) < 0)
return 0;
@@ -146,7 +147,26 @@ AVOutputFormat mp2_muxer = {
#endif
#if CONFIG_MP3_MUXER
-static int id3v2_check_write_tag(AVFormatContext *s, AVMetadataTag *t, const char table[][4])
+typedef struct MP3Context {
+ const AVClass *class;
+ int id3v2_version;
+} MP3Context;
+
+static const AVOption options[] = {
+ { "id3v2_version", "Select ID3v2 version to write. Currently 3 and 4 are supported.",
+ offsetof(MP3Context, id3v2_version), FF_OPT_TYPE_INT, 4, 3, 4, AV_OPT_FLAG_ENCODING_PARAM},
+ { NULL },
+};
+
+static const AVClass mp3_muxer_class = {
+ "MP3 muxer",
+ av_default_item_name,
+ options,
+ LIBAVUTIL_VERSION_INT,
+};
+
+static int id3v2_check_write_tag(AVFormatContext *s, AVMetadataTag *t, const char table[][4],
+ enum ID3v2Encoding enc)
{
uint32_t tag;
int i;
@@ -156,21 +176,23 @@ static int id3v2_check_write_tag(AVFormatContext *s, AVMetadataTag *t, const cha
tag = AV_RB32(t->key);
for (i = 0; *table[i]; i++)
if (tag == AV_RB32(table[i]))
- return id3v2_put_ttag(s, t->value, NULL, tag, ID3v2_ENCODING_UTF8);
+ return id3v2_put_ttag(s, t->value, NULL, tag, enc);
return -1;
}
/**
- * Write an ID3v2.4 header at beginning of stream
+ * Write an ID3v2 header at beginning of stream
*/
static int mp3_write_header(struct AVFormatContext *s)
{
+ MP3Context *mp3 = s->priv_data;
AVMetadataTag *t = NULL;
- int totlen = 0;
+ int totlen = 0, enc = mp3->id3v2_version == 3 ? ID3v2_ENCODING_UTF16BOM :
+ ID3v2_ENCODING_UTF8;
int64_t size_pos, cur_pos;
- put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
+ put_be32(s->pb, MKBETAG('I', 'D', '3', mp3->id3v2_version));
put_byte(s->pb, 0);
put_byte(s->pb, 0); /* flags */
@@ -179,21 +201,24 @@ static int mp3_write_header(struct AVFormatContext *s)
put_be32(s->pb, 0);
ff_metadata_conv(&s->metadata, ff_id3v2_34_metadata_conv, NULL);
- ff_metadata_conv(&s->metadata, ff_id3v2_4_metadata_conv, NULL);
+ if (mp3->id3v2_version == 4)
+ ff_metadata_conv(&s->metadata, ff_id3v2_4_metadata_conv, NULL);
+
while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) {
int ret;
- if ((ret = id3v2_check_write_tag(s, t, ff_id3v2_tags)) > 0) {
+ if ((ret = id3v2_check_write_tag(s, t, ff_id3v2_tags, enc)) > 0) {
totlen += ret;
continue;
}
- if ((ret = id3v2_check_write_tag(s, t, ff_id3v2_4_tags)) > 0) {
+ if ((ret = id3v2_check_write_tag(s, t, mp3->id3v2_version == 3 ?
+ ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) {
totlen += ret;
continue;
}
/* unknown tag, write as TXXX frame */
- totlen += id3v2_put_ttag(s, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), ID3v2_ENCODING_UTF8);
+ totlen += id3v2_put_ttag(s, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc);
}
cur_pos = url_ftell(s->pb);
@@ -209,12 +234,13 @@ AVOutputFormat mp3_muxer = {
NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
"audio/x-mpeg",
"mp3",
- 0,
+ sizeof(MP3Context),
CODEC_ID_MP3,
CODEC_ID_NONE,
mp3_write_header,
mp3_write_packet,
mp3_write_trailer,
AVFMT_NOTIMESTAMPS,
+ .priv_class = &mp3_muxer_class,
};
#endif
--
1.7.2.3
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