uint16_t var_buffer_get16( var_buffer_t *p_buf )
{
uint16_t i_b1, i_b2;
i_b1 = var_buffer_get8( p_buf );
i_b2 = var_buffer_get8( p_buf );
return( i_b1 + ( i_b2 << 8 ) );
}
void var_buffer_getguid( var_buffer_t *p_buf, guid_t *p_guid )
{
int i;
p_guid->v1 = var_buffer_get32( p_buf );
p_guid->v2 = var_buffer_get16( p_buf );
p_guid->v3 = var_buffer_get16( p_buf );
for( i = 0; i < 8; i++ )
{
p_guid->v4[i] = var_buffer_get8( p_buf );
}
}
void asf_HeaderParse ( asf_header_t *hdr,
uint8_t *p_header, int i_header )
{
var_buffer_t buffer;
guid_t guid;
uint64_t i_size;
hdr->i_file_size = 0;
hdr->i_data_packets_count = 0;
hdr->i_min_data_packet_size = 0;
for( unsigned i = 0; i < 128; i++ )
{
hdr->stream[i].i_cat = ASF_CODEC_TYPE_UNKNOWN;
hdr->stream[i].i_selected = 0;
hdr->stream[i].i_bitrate = -1;
}
var_buffer_initread( &buffer, p_header, i_header );
var_buffer_getguid( &buffer, &guid );
if( !guidcmp( &guid, &asf_object_header_guid ) )
{
/* ERROR: */
}
var_buffer_getmemory( &buffer, NULL, 30 - 16 );
for( ;; )
{
var_buffer_getguid( &buffer, &guid );
i_size = var_buffer_get64( &buffer );
if( guidcmp( &guid, &asf_object_file_properties_guid ) )
{
var_buffer_getmemory( &buffer, NULL, 16 );
hdr->i_file_size = var_buffer_get64( &buffer );
var_buffer_getmemory( &buffer, NULL, 8 );
hdr->i_data_packets_count = var_buffer_get64( &buffer );
var_buffer_getmemory( &buffer, NULL, 8+8+8+4);
hdr->i_min_data_packet_size = var_buffer_get32( &buffer );
var_buffer_getmemory( &buffer, NULL, i_size - 24 - 16 - 8 - 8 - 8 - 8-8-8-4 - 4);
}
else if( guidcmp( &guid, &asf_object_header_extension_guid ) )
{
/* Enter it */
var_buffer_getmemory( &buffer, NULL, 46 - 24 );
}
else if( guidcmp( &guid, &asf_object_extended_stream_properties_guid ) )
{
/* Grrrrrr */
int16_t i_count1, i_count2;
int i_subsize;
var_buffer_getmemory( &buffer, NULL, 84 - 24 );
i_count1 = var_buffer_get16( &buffer );
i_count2 = var_buffer_get16( &buffer );
i_subsize = 88;
for( int i = 0; i < i_count1; i++ )
{
int i_len;
var_buffer_get16( &buffer );
i_len = var_buffer_get16( &buffer );
var_buffer_getmemory( &buffer, NULL, i_len );
i_subsize += 4 + i_len;
}
for( int i = 0; i < i_count2; i++ )
{
int i_len;
var_buffer_getmemory( &buffer, NULL, 16 + 2 );
i_len = var_buffer_get32( &buffer );
var_buffer_getmemory( &buffer, NULL, i_len );
i_subsize += 16 + 6 + i_len;
}
if( i_size - i_subsize <= 24 )
{
var_buffer_getmemory( &buffer, NULL, i_size - i_subsize );
}
/* It's a hack we just skip the first part of the object until
* the embed stream properties if any (ugly, but whose fault ?) */
}
else if( guidcmp( &guid, &asf_object_stream_properties_guid ) )
{
int i_stream_id;
guid_t stream_type;
var_buffer_getguid( &buffer, &stream_type );
var_buffer_getmemory( &buffer, NULL, 32 );
i_stream_id = var_buffer_get8( &buffer ) & 0x7f;
var_buffer_getmemory( &buffer, NULL, i_size - 24 - 32 - 16 - 1);
if( guidcmp( &stream_type, &asf_object_stream_type_video ) )
{
hdr->stream[i_stream_id].i_cat = ASF_CODEC_TYPE_VIDEO;
}
else if( guidcmp( &stream_type, &asf_object_stream_type_audio ) )
{
hdr->stream[i_stream_id].i_cat = ASF_CODEC_TYPE_AUDIO;
}
else
{
hdr->stream[i_stream_id].i_cat = ASF_CODEC_TYPE_UNKNOWN;
}
}
else if ( guidcmp( &guid, &asf_object_stream_bitrate_properties ) )
{
int i_count;
uint8_t i_stream_id;
i_count = var_buffer_get16( &buffer );
i_size -= 2;
while( i_count > 0 )
{
i_stream_id = var_buffer_get16( &buffer )&0x7f;
hdr->stream[i_stream_id].i_bitrate = var_buffer_get32( &buffer );
i_count--;
i_size -= 6;
}
var_buffer_getmemory( &buffer, NULL, i_size - 24 );
}
else
{
// skip unknown guid
var_buffer_getmemory( &buffer, NULL, i_size - 24 );
}
if( var_buffer_readempty( &buffer ) )
return;
}
}
