static int vc1_importer_probe( importer_t *importer )
{
/* Find the first start code. */
vc1_importer_t *vc1_imp = create_vc1_importer( importer );
if( !vc1_imp )
return LSMASH_ERR_MEMORY_ALLOC;
lsmash_bs_t *bs = importer->bs;
uint64_t first_ebdu_head_pos = 0;
int err;
while( 1 )
{
/* The first EBDU in decoding order of the stream shall have start code (0x000001). */
if( 0x000001 == lsmash_bs_show_be24( bs, first_ebdu_head_pos ) )
break;
/* Invalid if encountered any value of non-zero before the first start code. */
if( lsmash_bs_show_byte( bs, first_ebdu_head_pos ) )
{
err = LSMASH_ERR_INVALID_DATA;
goto fail;
}
++first_ebdu_head_pos;
}
/* OK. It seems the stream has a sequence header of VC-1. */
importer->info = vc1_imp;
vc1_info_t *info = &vc1_imp->info;
lsmash_bs_read_seek( bs, first_ebdu_head_pos, SEEK_SET );
info->ebdu_head_pos = first_ebdu_head_pos;
if( (err = vc1_analyze_whole_stream( importer )) < 0 )
goto fail;
lsmash_video_summary_t *summary = vc1_create_summary( info, &vc1_imp->first_sequence, vc1_imp->max_au_length );
if( !summary )
{
err = LSMASH_ERR_NAMELESS;
goto fail;
}
if( lsmash_add_entry( importer->summaries, summary ) < 0 )
{
lsmash_cleanup_summary( (lsmash_summary_t *)summary );
err = LSMASH_ERR_MEMORY_ALLOC;
goto fail;
}
/* Go back to layer of the first EBDU. */
importer->status = IMPORTER_OK;
lsmash_bs_read_seek( bs, first_ebdu_head_pos, SEEK_SET );
info->prev_bdu_type = 0xFF; /* 0xFF is a forbidden value. */
info->ebdu_head_pos = first_ebdu_head_pos;
uint8_t *temp_access_unit = info->access_unit.data;
uint8_t *temp_incomplete_access_unit = info->access_unit.incomplete_data;
memset( &info->access_unit, 0, sizeof(vc1_access_unit_t) );
info->access_unit.data = temp_access_unit;
info->access_unit.incomplete_data = temp_incomplete_access_unit;
memset( &info->picture, 0, sizeof(vc1_picture_info_t) );
return 0;
fail:
remove_vc1_importer( vc1_imp );
importer->info = NULL;
lsmash_remove_entries( importer->summaries, lsmash_cleanup_summary );
return err;
}
static vc1_importer_t *create_vc1_importer( importer_t *importer )
{
vc1_importer_t *vc1_imp = lsmash_malloc_zero( sizeof(vc1_importer_t) );
if( !vc1_imp )
return NULL;
if( vc1_setup_parser( &vc1_imp->info, 0 ) < 0 )
{
remove_vc1_importer( vc1_imp );
return NULL;
}
return vc1_imp;
}
static vc1_importer_t *create_vc1_importer( importer_t *importer )
{
vc1_importer_t *vc1_imp = lsmash_malloc_zero( sizeof(vc1_importer_t) );
if( !vc1_imp )
return NULL;
if( vc1_setup_parser( &vc1_imp->info, 0 ) < 0 )
{
remove_vc1_importer( vc1_imp );
return NULL;
}
lsmash_bs_t *bs = lsmash_bs_create();
if( !bs )
{
remove_vc1_importer( vc1_imp );
return NULL;
}
bs->stream = importer->stream;
bs->read = lsmash_fread_wrapper;
bs->seek = lsmash_fseek_wrapper;
bs->unseekable = importer->is_stdin;
bs->buffer.max_size = BS_MAX_DEFAULT_READ_SIZE;
vc1_imp->bs = bs;
return vc1_imp;
}
static void vc1_importer_cleanup( importer_t *importer )
{
debug_if( importer && importer->info )
remove_vc1_importer( importer->info );
}
