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Code Issues Releases Activity

extract aspect ratio

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Originally committed as revision 7791 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-01-31 23:32:01 +00:00
parent 118a49b0b7
commit 30e88789c9
2 changed files with 56 additions and 4 deletions
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56
libavformat/asf.c
View File

@ -67,6 +67,7 @@ static void print_guid(const GUID *g)
else PRINT_IF_GUID(g, extended_content_header);
else PRINT_IF_GUID(g, ext_stream_embed_stream_header);
else PRINT_IF_GUID(g, ext_stream_audio_stream);
else PRINT_IF_GUID(g, metadata_header);
else
printf("(GUID: unknown) ");
for(i=0;i<16;i++)
@ -123,6 +124,16 @@ static int asf_probe(AVProbeData *pd)
return 0;
}
static int get_value(ByteIOContext *pb, int type){
switch(type){
case 2: return get_le32(pb);
case 3: return get_le32(pb);
case 4: return get_le64(pb);
case 5: return get_le16(pb);
default:return INT_MIN;
}
}
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
ASFContext *asf = s->priv_data;
@ -132,6 +143,9 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
ASFStream *asf_st;
int size, i;
int64_t gsize;
AVRational dar[128];
memset(dar, 0, sizeof(dar));
get_guid(pb, &g);
if (memcmp(&g, &asf_header, sizeof(GUID)))
@ -353,14 +367,34 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
}
if ((value_type >= 2) && (value_type <= 5)) // boolean or DWORD or QWORD or WORD
{
if (value_type==2) value_num = get_le32(pb);
if (value_type==3) value_num = get_le32(pb);
if (value_type==4) value_num = get_le64(pb);
if (value_type==5) value_num = get_le16(pb);
value_num= get_value(pb, value_type);
if (!strcmp(name,"WM/Track" )) s->track = value_num + 1;
if (!strcmp(name,"WM/TrackNumber")) s->track = value_num;
}
}
} else if (!memcmp(&g, &metadata_header, sizeof(GUID))) {
int n, stream_num, name_len, value_len, value_type, value_num;
n = get_le16(pb);
for(i=0;i<n;i++) {
char name[1024];
get_le16(pb); //lang_list_index
stream_num= get_le16(pb);
name_len= get_le16(pb);
value_type= get_le16(pb);
value_len= get_le32(pb);
get_str16_nolen(pb, name_len, name, sizeof(name));
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
value_num= get_le16(pb);//we should use get_value() here but it doesnt work 2 is le16 here but le32 elsewhere
url_fskip(pb, value_len - 2);
if(stream_num<128){
if (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
}
}
} else if (!memcmp(&g, &ext_stream_header, sizeof(GUID))) {
int ext_len, payload_ext_ct, stream_ct;
uint32_t ext_d;
@ -443,6 +477,20 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
asf->data_offset = url_ftell(pb);
asf->packet_size_left = 0;
for(i=0; i<128; i++){
int stream_num= asf->asfid2avid[i];
if(stream_num>=0 && dar[i].num>0 && dar[i].den>0){
AVCodecContext *codec= s->streams[stream_num]->codec;
codec->sample_aspect_ratio=
av_div_q(
dar[i],
(AVRational){codec->width, codec->height}
);
//av_log(NULL, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, codec->sample_aspect_ratio.num, codec->sample_aspect_ratio.den);
}
}
return 0;
fail:

4
libavformat/asf.h
View File

@ -208,6 +208,10 @@ static const GUID ext_stream_audio_stream = {
0x9d, 0x8c, 0x17, 0x31, 0xE1, 0x03, 0x28, 0x45, 0xb5, 0x82, 0x3d, 0xf9, 0xdb, 0x22, 0xf5, 0x03
};
static const GUID metadata_header = {
0xea, 0xcb, 0xf8, 0xc5, 0xaf, 0x5b, 0x77, 0x48, 0x84, 0x67, 0xaa, 0x8c, 0x44, 0xfa, 0x4c, 0xca
};
/* I am not a number !!! This GUID is the one found on the PC used to
generate the stream */
static const GUID my_guid = {