static int AVI_NextChunk( stream_t *s, avi_chunk_t *p_chk )
{
avi_chunk_t chk;
if( !p_chk )
{
if( AVI_ChunkReadCommon( s, &chk ) )
{
return VLC_EGENERIC;
}
p_chk = &chk;
}
if( p_chk->common.p_father )
{
if( p_chk->common.p_father->common.i_chunk_pos +
__EVEN( p_chk->common.p_father->common.i_chunk_size ) + 8 <
p_chk->common.i_chunk_pos +
__EVEN( p_chk->common.i_chunk_size ) + 8 )
{
return VLC_EGENERIC;
}
}
return stream_Seek( s, p_chk->common.i_chunk_pos +
__EVEN( p_chk->common.i_chunk_size ) + 8 );
}
int AVI_ChunkRead( stream_t *s, avi_chunk_t *p_chk, avi_chunk_t *p_father )
{
int i_index;
if( !p_chk )
{
msg_Warn( (vlc_object_t*)s, "cannot read null chunk" );
return VLC_EGENERIC;
}
if( AVI_ChunkReadCommon( s, p_chk ) )
{
msg_Warn( (vlc_object_t*)s, "cannot read one chunk" );
return VLC_EGENERIC;
}
if( p_chk->common.i_chunk_fourcc == VLC_FOURCC( 0, 0, 0, 0 ) )
{
msg_Warn( (vlc_object_t*)s, "found null fourcc chunk (corrupted file?)" );
return AVI_ZERO_FOURCC;
}
p_chk->common.p_father = p_father;
i_index = AVI_ChunkFunctionFind( p_chk->common.i_chunk_fourcc );
if( AVI_Chunk_Function[i_index].AVI_ChunkRead_function )
{
int i_return = AVI_Chunk_Function[i_index].AVI_ChunkRead_function( s, p_chk );
if ( i_return == AVI_STRD_ZERO_CHUNK || i_return == AVI_ZERO_FOURCC )
{
if ( !p_father ) return VLC_EGENERIC;
return AVI_NextChunk( s, p_father );
}
return i_return;
}
else if( ( ((char*)&p_chk->common.i_chunk_fourcc)[0] == 'i' &&
((char*)&p_chk->common.i_chunk_fourcc)[1] == 'x' ) ||
( ((char*)&p_chk->common.i_chunk_fourcc)[2] == 'i' &&
((char*)&p_chk->common.i_chunk_fourcc)[3] == 'x' ) )
{
p_chk->common.i_chunk_fourcc = AVIFOURCC_indx;
return AVI_ChunkRead_indx( s, p_chk );
}
msg_Warn( (vlc_object_t*)s, "unknown chunk: %4.4s (not loaded)",
(char*)&p_chk->common.i_chunk_fourcc );
return AVI_NextChunk( s, p_chk );
}
static int AVI_NextChunk( stream_t *s, avi_chunk_t *p_chk )
{
avi_chunk_t chk;
if( !p_chk )
{
if( AVI_ChunkReadCommon( s, &chk ) )
{
return VLC_EGENERIC;
}
p_chk = &chk;
}
if( p_chk->common.p_father )
{
if( p_chk->common.p_father->common.i_chunk_pos +
__EVEN( p_chk->common.p_father->common.i_chunk_size ) + 8 <
p_chk->common.i_chunk_pos +
__EVEN( p_chk->common.i_chunk_size ) + 8 )
{
return VLC_EGENERIC;
}
}
bool b_seekable = false;
uint64_t i_offset = p_chk->common.i_chunk_pos +
__EVEN( p_chk->common.i_chunk_size ) + 8;
if ( !vlc_stream_Control(s, STREAM_CAN_SEEK, &b_seekable) && b_seekable )
{
return vlc_stream_Seek( s, i_offset );
}
else
{
ssize_t i_read = i_offset - vlc_stream_Tell( s );
return (i_read >=0 && vlc_stream_Read( s, NULL, i_read ) == i_read) ?
VLC_SUCCESS : VLC_EGENERIC;
}
}
