metadata_object.c

wince下著名的视频播放器源码

	cuesheet_calculate_length_(object);
	return true;
}


/****************************************************************************
 *
 * Metadata object routines
 *
 ***************************************************************************/

FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_new(FLAC__MetadataType type)
{
	FLAC__StreamMetadata *object;

	if(type > FLAC__MAX_METADATA_TYPE_CODE)
		return 0;

	object = (FLAC__StreamMetadata*)calloc(1, sizeof(FLAC__StreamMetadata));
	if(0 != object) {
		object->is_last = false;
		object->type = type;
		switch(type) {
			case FLAC__METADATA_TYPE_STREAMINFO:
				object->length = FLAC__STREAM_METADATA_STREAMINFO_LENGTH;
				break;
			case FLAC__METADATA_TYPE_PADDING:
				/* calloc() took care of this for us:
				object->length = 0;
				*/
				break;
			case FLAC__METADATA_TYPE_APPLICATION:
				object->length = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8;
				/* calloc() took care of this for us:
				object->data.application.data = 0;
				*/
				break;
			case FLAC__METADATA_TYPE_SEEKTABLE:
				/* calloc() took care of this for us:
				object->length = 0;
				object->data.seek_table.num_points = 0;
				object->data.seek_table.points = 0;
				*/
				break;
			case FLAC__METADATA_TYPE_VORBIS_COMMENT:
				{
					object->data.vorbis_comment.vendor_string.length = (unsigned)strlen(FLAC__VENDOR_STRING);
					if(!copy_bytes_(&object->data.vorbis_comment.vendor_string.entry, (const FLAC__byte*)FLAC__VENDOR_STRING, object->data.vorbis_comment.vendor_string.length+1)) {
						free(object);
						return 0;
					}
					vorbiscomment_calculate_length_(object);
				}
				break;
			case FLAC__METADATA_TYPE_CUESHEET:
				cuesheet_calculate_length_(object);
				break;
			default:
				/* calloc() took care of this for us:
				object->length = 0;
				object->data.unknown.data = 0;
				*/
				break;
		}
	}

	return object;
}

FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_clone(const FLAC__StreamMetadata *object)
{
	FLAC__StreamMetadata *to;

	FLAC__ASSERT(0 != object);

	if(0 != (to = FLAC__metadata_object_new(object->type))) {
		to->is_last = object->is_last;
		to->type = object->type;
		to->length = object->length;
		switch(to->type) {
			case FLAC__METADATA_TYPE_STREAMINFO:
				memcpy(&to->data.stream_info, &object->data.stream_info, sizeof(FLAC__StreamMetadata_StreamInfo));
				break;
			case FLAC__METADATA_TYPE_PADDING:
				break;
			case FLAC__METADATA_TYPE_APPLICATION:
				memcpy(&to->data.application.id, &object->data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8);
				if(!copy_bytes_(&to->data.application.data, object->data.application.data, object->length - FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8)) {
					FLAC__metadata_object_delete(to);
					return 0;
				}
				break;
			case FLAC__METADATA_TYPE_SEEKTABLE:
				to->data.seek_table.num_points = object->data.seek_table.num_points;
				if(!copy_bytes_((FLAC__byte**)&to->data.seek_table.points, (FLAC__byte*)object->data.seek_table.points, object->data.seek_table.num_points * sizeof(FLAC__StreamMetadata_SeekPoint))) {
					FLAC__metadata_object_delete(to);
					return 0;
				}
				break;
			case FLAC__METADATA_TYPE_VORBIS_COMMENT:
				if(0 != to->data.vorbis_comment.vendor_string.entry) {
					free(to->data.vorbis_comment.vendor_string.entry);
					to->data.vorbis_comment.vendor_string.entry = 0;
				}
				if(!copy_vcentry_(&to->data.vorbis_comment.vendor_string, &object->data.vorbis_comment.vendor_string)) {
					FLAC__metadata_object_delete(to);
					return 0;
				}
				if(object->data.vorbis_comment.num_comments == 0) {
					FLAC__ASSERT(0 == object->data.vorbis_comment.comments);
					to->data.vorbis_comment.comments = 0;
				}
				else {
					FLAC__ASSERT(0 != object->data.vorbis_comment.comments);
					to->data.vorbis_comment.comments = vorbiscomment_entry_array_copy_(object->data.vorbis_comment.comments, object->data.vorbis_comment.num_comments);
					if(0 == to->data.vorbis_comment.comments) {
						FLAC__metadata_object_delete(to);
						return 0;
					}
				}
				to->data.vorbis_comment.num_comments = object->data.vorbis_comment.num_comments;
				break;
			case FLAC__METADATA_TYPE_CUESHEET:
				memcpy(&to->data.cue_sheet, &object->data.cue_sheet, sizeof(FLAC__StreamMetadata_CueSheet));
				if(object->data.cue_sheet.num_tracks == 0) {
					FLAC__ASSERT(0 == object->data.cue_sheet.tracks);
				}
				else {
					FLAC__ASSERT(0 != object->data.cue_sheet.tracks);
					to->data.cue_sheet.tracks = cuesheet_track_array_copy_(object->data.cue_sheet.tracks, object->data.cue_sheet.num_tracks);
					if(0 == to->data.cue_sheet.tracks) {
						FLAC__metadata_object_delete(to);
						return 0;
					}
				}
				break;
			default:
				if(!copy_bytes_(&to->data.unknown.data, object->data.unknown.data, object->length)) {
					FLAC__metadata_object_delete(to);
					return 0;
				}
				break;
		}
	}

	return to;
}

void FLAC__metadata_object_delete_data(FLAC__StreamMetadata *object)
{
	FLAC__ASSERT(0 != object);

	switch(object->type) {
		case FLAC__METADATA_TYPE_STREAMINFO:
		case FLAC__METADATA_TYPE_PADDING:
			break;
		case FLAC__METADATA_TYPE_APPLICATION:
			if(0 != object->data.application.data) {
				free(object->data.application.data);
				object->data.application.data = 0;
			}
			break;
		case FLAC__METADATA_TYPE_SEEKTABLE:
			if(0 != object->data.seek_table.points) {
				free(object->data.seek_table.points);
				object->data.seek_table.points = 0;
			}
			break;
		case FLAC__METADATA_TYPE_VORBIS_COMMENT:
			if(0 != object->data.vorbis_comment.vendor_string.entry) {
				free(object->data.vorbis_comment.vendor_string.entry);
				object->data.vorbis_comment.vendor_string.entry = 0;
			}
			if(0 != object->data.vorbis_comment.comments) {
				FLAC__ASSERT(object->data.vorbis_comment.num_comments > 0);
				vorbiscomment_entry_array_delete_(object->data.vorbis_comment.comments, object->data.vorbis_comment.num_comments);
			}
			break;
		case FLAC__METADATA_TYPE_CUESHEET:
			if(0 != object->data.cue_sheet.tracks) {
				FLAC__ASSERT(object->data.cue_sheet.num_tracks > 0);
				cuesheet_track_array_delete_(object->data.cue_sheet.tracks, object->data.cue_sheet.num_tracks);
			}
			break;
		default:
			if(0 != object->data.unknown.data) {
				free(object->data.unknown.data);
				object->data.unknown.data = 0;
			}
			break;
	}
}

FLAC_API void FLAC__metadata_object_delete(FLAC__StreamMetadata *object)
{
	FLAC__metadata_object_delete_data(object);
	free(object);
}

static FLAC__bool compare_block_data_streaminfo_(const FLAC__StreamMetadata_StreamInfo *block1, const FLAC__StreamMetadata_StreamInfo *block2)
{
	if(block1->min_blocksize != block2->min_blocksize)
		return false;
	if(block1->max_blocksize != block2->max_blocksize)
		return false;
	if(block1->min_framesize != block2->min_framesize)
		return false;
	if(block1->max_framesize != block2->max_framesize)
		return false;
	if(block1->sample_rate != block2->sample_rate)
		return false;
	if(block1->channels != block2->channels)
		return false;
	if(block1->bits_per_sample != block2->bits_per_sample)
		return false;
	if(block1->total_samples != block2->total_samples)
		return false;
	if(0 != memcmp(block1->md5sum, block2->md5sum, 16))
		return false;
	return true;
}

static FLAC__bool compare_block_data_application_(const FLAC__StreamMetadata_Application *block1, const FLAC__StreamMetadata_Application *block2, unsigned block_length)
{
	FLAC__ASSERT(0 != block1);
	FLAC__ASSERT(0 != block2);
	FLAC__ASSERT(block_length >= sizeof(block1->id));

	if(0 != memcmp(block1->id, block2->id, sizeof(block1->id)))
		return false;
	if(0 != block1->data && 0 != block2->data)
		return 0 == memcmp(block1->data, block2->data, block_length - sizeof(block1->id));
	else
		return block1->data == block2->data;
}

static FLAC__bool compare_block_data_seektable_(const FLAC__StreamMetadata_SeekTable *block1, const FLAC__StreamMetadata_SeekTable *block2)
{
	unsigned i;

	FLAC__ASSERT(0 != block1);
	FLAC__ASSERT(0 != block2);

	if(block1->num_points != block2->num_points)
		return false;

	if(0 != block1->points && 0 != block2->points) {
		for(i = 0; i < block1->num_points; i++) {
			if(block1->points[i].sample_number != block2->points[i].sample_number)
				return false;
			if(block1->points[i].stream_offset != block2->points[i].stream_offset)
				return false;
			if(block1->points[i].frame_samples != block2->points[i].frame_samples)
				return false;
		}
		return true;
	}
	else
		return block1->points == block2->points;
}

static FLAC__bool compare_block_data_vorbiscomment_(const FLAC__StreamMetadata_VorbisComment *block1, const FLAC__StreamMetadata_VorbisComment *block2)
{
	unsigned i;

	if(block1->vendor_string.length != block2->vendor_string.length)
		return false;

	if(0 != block1->vendor_string.entry && 0 != block2->vendor_string.entry) {
		if(0 != memcmp(block1->vendor_string.entry, block2->vendor_string.entry, block1->vendor_string.length))
			return false;
	}
	else if(block1->vendor_string.entry != block2->vendor_string.entry)
		return false;

	if(block1->num_comments != block2->num_comments)
		return false;

	for(i = 0; i < block1->num_comments; i++) {
		if(0 != block1->comments[i].entry && 0 != block2->comments[i].entry) {
			if(0 != memcmp(block1->comments[i].entry, block2->comments[i].entry, block1->comments[i].length))
				return false;
		}
		else if(block1->comments[i].entry != block2->comments[i].entry)
			return false;
	}
	return true;
}

static FLAC__bool compare_block_data_cuesheet_(const FLAC__StreamMetadata_CueSheet *block1, const FLAC__StreamMetadata_CueSheet *block2)
{
	unsigned i, j;

	if(0 != strcmp(block1->media_catalog_number, block2->media_catalog_number))
		return false;

	if(block1->lead_in != block2->lead_in)
		return false;

	if(block1->is_cd != block2->is_cd)
		return false;

	if(block1->num_tracks != block2->num_tracks)
		return false;

	if(0 != block1->tracks && 0 != block2->tracks) {
		FLAC__ASSERT(block1->num_tracks > 0);
		for(i = 0; i < block1->num_tracks; i++) {
			if(block1->tracks[i].offset != block2->tracks[i].offset)
				return false;
			if(block1->tracks[i].number != block2->tracks[i].number)
				return false;
			if(0 != memcmp(block1->tracks[i].isrc, block2->tracks[i].isrc, sizeof(block1->tracks[i].isrc)))
				return false;
			if(block1->tracks[i].type != block2->tracks[i].type)
				return false;
			if(block1->tracks[i].pre_emphasis != block2->tracks[i].pre_emphasis)
				return false;
			if(block1->tracks[i].num_indices != block2->tracks[i].num_indices)
				return false;
			if(0 != block1->tracks[i].indices && 0 != block2->tracks[i].indices) {
				FLAC__ASSERT(block1->tracks[i].num_indices > 0);
				for(j = 0; j < block1->tracks[i].num_indices; j++) {
					if(block1->tracks[i].indices[j].offset != block2->tracks[i].indices[j].offset)
						return false;
					if(block1->tracks[i].indices[j].number != block2->tracks[i].indices[j].number)
						return false;
				}
			}
			else if(block1->tracks[i].indices != block2->tracks[i].indices)
				return false;
		}
	}
	else if(block1->tracks != block2->tracks)
		return false;
	return true;
}

static FLAC__bool compare_block_data_unknown_(const FLAC__StreamMetadata_Unknown *block1, const FLAC__StreamMetadata_Unknown *block2, unsigned block_length)
{
	FLAC__ASSERT(0 != block1);
	FLAC__ASSERT(0 != block2);

	if(0 != block1->data && 0 != block2->data)
		return 0 == memcmp(block1->data, block2->data, block_length);
	else
		return block1->data == block2->data;
}

FLAC_API FLAC__bool FLAC__metadata_object_is_equal(const FLAC__StreamMetadata *block1, const FLAC__StreamMetadata *block2)
{
	FLAC__ASSERT(0 != block1);
	FLAC__ASSERT(0 != block2);

	if(block1->type != block2->type) {
		return false;
	}
	if(block1->is_last != block2->is_last) {
		return false;
	}
	if(block1->length != block2->length) {
		return false;
	}
	switch(block1->type) {
		case FLAC__METADATA_TYPE_STREAMINFO:
			return compare_block_data_streaminfo_(&block1->data.stream_info, &block2->data.stream_info);
		case FLAC__METADATA_TYPE_PADDING:
			return true; /* we don't compare the padding guts */
		case FLAC__METADATA_TYPE_APPLICATION: