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matroskadec: add basic tags support (metadata)

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Originally committed as revision 14672 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2008-08-08 23:50:38 +00:00
parent 4f5c72e857
commit 44015c56a6
2 changed files with 73 additions and 1 deletions
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8
libavformat/matroska.h
View File

@ -133,7 +133,13 @@
#define MATROSKA_ID_CUECLUSTERPOSITION 0xF1
/* IDs in the tags master */
/* TODO */
#define MATROSKA_ID_TAG 0x7373
#define MATROSKA_ID_SIMPLETAG 0x67C8
#define MATROSKA_ID_TAGNAME 0x45A3
#define MATROSKA_ID_TAGSTRING 0x4487
#define MATROSKA_ID_TAGLANG 0x447A
#define MATROSKA_ID_TAGDEFAULT 0x44B4
#define MATROSKA_ID_TAGTARGETS 0x63C0
/* IDs in the seekhead master */
#define MATROSKA_ID_SEEKENTRY 0x4DBB

66
libavformat/matroskadec.c
View File

@ -163,6 +163,12 @@ typedef struct {
EbmlList pos;
} MatroskaIndex;
typedef struct {
char *name;
char *string;
EbmlList sub;
} MatroskaTag;
typedef struct {
uint64_t id;
uint64_t pos;
@ -188,6 +194,7 @@ typedef struct {
EbmlList attachments;
EbmlList chapters;
EbmlList index;
EbmlList tags;
EbmlList seekhead;
/* byte position of the segment inside the stream */
@ -390,7 +397,25 @@ static EbmlSyntax matroska_index[] = {
{ 0 }
};
static EbmlSyntax matroska_simpletag[] = {
{ MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag,name) },
{ MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag,string) },
{ MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
{ MATROSKA_ID_TAGLANG, EBML_NONE },
{ MATROSKA_ID_TAGDEFAULT, EBML_NONE },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_tag[] = {
{ MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), 0, {.n=matroska_simpletag} },
{ MATROSKA_ID_TAGTARGETS, EBML_NONE },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_tags[] = {
{ MATROSKA_ID_TAG, EBML_NEST, 0, offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
@ -448,6 +473,25 @@ static EbmlSyntax matroska_clusters[] = {
{ 0 }
};
#define SIZE_OFF(x) sizeof(((AVFormatContext*)0)->x),offsetof(AVFormatContext,x)
const struct {
const char name[16];
int size;
int offset;
} metadata[] = {
{ "TITLE", SIZE_OFF(title) },
{ "ARTIST", SIZE_OFF(author) },
{ "WRITTEN_BY", SIZE_OFF(author) },
{ "LEAD_PERFORMER", SIZE_OFF(author) },
{ "COPYRIGHT", SIZE_OFF(copyright) },
{ "COMMENT", SIZE_OFF(comment) },
{ "ALBUM", SIZE_OFF(album) },
{ "DATE_WRITTEN", SIZE_OFF(year) },
{ "DATE_RELEASED", SIZE_OFF(year) },
{ "PART_NUMBER", SIZE_OFF(track) },
{ "GENRE", SIZE_OFF(genre) },
};
/*
* Return: Whether we reached the end of a level in the hierarchy or not.
*/
@ -891,6 +935,27 @@ static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
return -1;
}
static void matroska_convert_tags(AVFormatContext *s, EbmlList *list)
{
MatroskaTag *tags = list->elem;
int i, j;
for (i=0; i < list->nb_elem; i++) {
for (j=0; j < ARRAY_SIZE(metadata); j++){
if (!strcmp(tags[i].name, metadata[j].name)) {
int *ptr = (int *)((char *)s + metadata[j].offset);
if (*ptr) continue;
if (metadata[j].size > sizeof(int))
av_strlcpy((char *)ptr, tags[i].string, metadata[j].size);
else
*ptr = atoi(tags[i].string);
}
}
if (tags[i].sub.nb_elem)
matroska_convert_tags(s, &tags[i].sub);
}
}
static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
{
EbmlList *seekhead_list = &matroska->seekhead;
@ -1002,6 +1067,7 @@ static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
if (matroska->title)
strncpy(matroska->ctx->title, matroska->title,
sizeof(matroska->ctx->title)-1);
matroska_convert_tags(s, &matroska->tags);
tracks = matroska->tracks.elem;
for (i=0; i < matroska->tracks.nb_elem; i++) {