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avformat/au: Read MetaData from AU Sun audio file header 

recognize title= album= artist= genre= track=

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Thomas Bernard 2016-06-07 00:25:38 +02:00 committed by Michael Niedermayer
parent 4879841d15
commit 836f3555a8
1 changed files with 68 additions and 2 deletions
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70
libavformat/au.c
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@ -66,6 +66,72 @@ static int au_probe(AVProbeData *p)
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)
@ -94,8 +160,8 @@ static int au_read_header(AVFormatContext *s)
channels = avio_rb32(pb);
if (size > 24) {
/* skip unused data */
avio_skip(pb, size - 24);
/* parse annotation field to get metadata */
au_read_annotation(s, size - 24);
}
codec = ff_codec_get_id(codec_au_tags, id);