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id3v2enc: add a function for writing attached pictures.

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Unused so far.
This commit is contained in:
Anton Khirnov 2012-02-27 22:51:28 +01:00
parent 24fe1a3b16
commit ba445f5557
2 changed files with 87 additions and 9 deletions
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5
libavformat/id3v2.h
View File

@ -107,6 +107,11 @@ void ff_id3v2_start(ID3v2EncContext *id3, AVIOContext *pb, int id3v2_version,
*/
int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3);
/**
* Write an attached picture from pkt into an ID3v2 tag.
*/
int ff_id3v2_write_apic(AVFormatContext *s, ID3v2EncContext *id3, AVPacket *pkt);
/**
* Finalize an opened ID3v2 tag.
*/

91
libavformat/id3v2enc.c
View File

@ -19,6 +19,7 @@
*/
#include <stdint.h>
#include <string.h>
#include "libavutil/dict.h"
#include "libavutil/intreadwrite.h"
@ -40,6 +41,20 @@ static int string_is_ascii(const uint8_t *str)
return !*str;
}
static void id3v2_encode_string(AVIOContext *pb, const uint8_t *str,
enum ID3v2Encoding enc)
{
int (*put)(AVIOContext*, const char*);
if (enc == ID3v2_ENCODING_UTF16BOM) {
avio_wl16(pb, 0xFEFF); /* BOM */
put = avio_put_str16le;
} else
put = avio_put_str;
put(pb, str);
}
/**
* Write a text frame with one (normal frames) or two (TXXX frames) strings
* according to encoding (only UTF-8 or UTF-16+BOM supported).
@ -50,7 +65,6 @@ static int id3v2_put_ttag(ID3v2EncContext *id3, AVIOContext *avioc, const char *
{
int len;
uint8_t *pb;
int (*put)(AVIOContext*, const char*);
AVIOContext *dyn_buf;
if (avio_open_dyn_buf(&dyn_buf) < 0)
return AVERROR(ENOMEM);
@ -62,15 +76,9 @@ static int id3v2_put_ttag(ID3v2EncContext *id3, AVIOContext *avioc, const char *
enc = ID3v2_ENCODING_ISO8859;
avio_w8(dyn_buf, enc);
if (enc == ID3v2_ENCODING_UTF16BOM) {
avio_wl16(dyn_buf, 0xFEFF); /* BOM */
put = avio_put_str16le;
} else
put = avio_put_str;
put(dyn_buf, str1);
id3v2_encode_string(dyn_buf, str1, enc);
if (str2)
put(dyn_buf, str2);
id3v2_encode_string(dyn_buf, str2, enc);
len = avio_close_dyn_buf(dyn_buf, &pb);
avio_wb32(avioc, tag);
@ -147,6 +155,71 @@ int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3)
return 0;
}
int ff_id3v2_write_apic(AVFormatContext *s, ID3v2EncContext *id3, AVPacket *pkt)
{
AVStream *st = s->streams[pkt->stream_index];
AVDictionaryEntry *e;
AVIOContext *dyn_buf;
uint8_t *buf;
const CodecMime *mime = ff_id3v2_mime_tags;
const char *mimetype = NULL, *desc = "";
int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM :
ID3v2_ENCODING_UTF8;
int i, len, type = 0;
/* get the mimetype*/
while (mime->id != CODEC_ID_NONE) {
if (mime->id == st->codec->codec_id) {
mimetype = mime->str;
break;
}
mime++;
}
if (!mimetype) {
av_log(s, AV_LOG_ERROR, "No mimetype is known for stream %d, cannot "
"write an attached picture.\n", st->index);
return AVERROR(EINVAL);
}
/* get the picture type */
e = av_dict_get(st->metadata, "comment", NULL, 0);
for (i = 0; e && i < FF_ARRAY_ELEMS(ff_id3v2_picture_types); i++) {
if (strstr(ff_id3v2_picture_types[i], e->value) == ff_id3v2_picture_types[i]) {
type = i;
break;
}
}
/* get the description */
if ((e = av_dict_get(st->metadata, "title", NULL, 0)))
desc = e->value;
/* start writing */
if (avio_open_dyn_buf(&dyn_buf) < 0)
return AVERROR(ENOMEM);
avio_w8(dyn_buf, enc);
avio_put_str(dyn_buf, mimetype);
avio_w8(dyn_buf, type);
id3v2_encode_string(dyn_buf, desc, enc);
avio_write(dyn_buf, pkt->data, pkt->size);
len = avio_close_dyn_buf(dyn_buf, &buf);
avio_wb32(s->pb, MKBETAG('A', 'P', 'I', 'C'));
if (id3->version == 3)
avio_wb32(s->pb, len);
else
id3v2_put_size(s->pb, len);
avio_wb16(s->pb, 0);
avio_write(s->pb, buf, len);
av_freep(&buf);
id3->len += len + ID3v2_HEADER_SIZE;
return 0;
}
void ff_id3v2_finish(ID3v2EncContext *id3, AVIOContext *pb)
{
int64_t cur_pos = avio_tell(pb);