generic-library/ffmpeg
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

asfdec: read attached pictures.

Browse Source
This commit is contained in:
Anton Khirnov 2012-06-21 22:17:43 +02:00
parent 728d2afa17
commit 5e745cefc0
1 changed files with 99 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

99
libavformat/asfdec.c
View File

@ -30,6 +30,7 @@
#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"
#include "id3v2.h"
#include "riff.h"
#include "asf.h"
#include "asfcrypt.h"
@ -173,6 +174,101 @@ static int get_value(AVIOContext *pb, int type){
}
}
/* MSDN claims that this should be "compatible with the ID3 frame, APIC",
* but in reality this is only loosely similar */
static int asf_read_picture(AVFormatContext *s, int len)
{
AVPacket pkt = { 0 };
const CodecMime *mime = ff_id3v2_mime_tags;
enum CodecID id = CODEC_ID_NONE;
char mimetype[64];
uint8_t *desc = NULL;
ASFStream *ast = NULL;
AVStream *st = NULL;
int ret, type, picsize, desc_len;
/* type + picsize + mime + desc */
if (len < 1 + 4 + 2 + 2) {
av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
return AVERROR_INVALIDDATA;
}
/* picture type */
type = avio_r8(s->pb);
len--;
if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);
type = 0;
}
/* picture data size */
picsize = avio_rl32(s->pb);
len -= 4;
/* picture MIME type */
len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));
while (mime->id != CODEC_ID_NONE) {
if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
id = mime->id;
break;
}
mime++;
}
if (id == CODEC_ID_NONE) {
av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
mimetype);
return 0;
}
if (picsize >= len) {
av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",
picsize, len);
return AVERROR_INVALIDDATA;
}
/* picture description */
desc_len = (len - picsize) * 2 + 1;
desc = av_malloc(desc_len);
if (!desc)
return AVERROR(ENOMEM);
len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);
ret = av_get_packet(s->pb, &pkt, picsize);
if (ret < 0)
goto fail;
st = avformat_new_stream(s, NULL);
ast = av_mallocz(sizeof(*ast));
if (!st || !ast) {
ret = AVERROR(ENOMEM);
goto fail;
}
st->priv_data = ast;
st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = id;
st->attached_pic = pkt;
st->attached_pic.stream_index = st->index;
st->attached_pic.flags |= AV_PKT_FLAG_KEY;
if (*desc)
av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
else
av_freep(&desc);
av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
return 0;
fail:
av_freep(&ast);
av_freep(&desc);
av_free_packet(&pkt);
return ret;
}
static void get_tag(AVFormatContext *s, const char *key, int type, int len)
{
char *value;
@ -190,6 +286,9 @@ static void get_tag(AVFormatContext *s, const char *key, int type, int len)
} else if (type > 1 && type <= 5) { // boolean or DWORD or QWORD or WORD
uint64_t num = get_value(s->pb, type);
snprintf(value, len, "%"PRIu64, num);
} else if (type == 1 && !strcmp(key, "WM/Picture")) { // handle cover art
asf_read_picture(s, len);
goto finish;
} else {
av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
goto finish;