metadata_object.c

wince下著名的视频播放器源码

			return compare_block_data_application_(&block1->data.application, &block2->data.application, block1->length);
		case FLAC__METADATA_TYPE_SEEKTABLE:
			return compare_block_data_seektable_(&block1->data.seek_table, &block2->data.seek_table);
		case FLAC__METADATA_TYPE_VORBIS_COMMENT:
			return compare_block_data_vorbiscomment_(&block1->data.vorbis_comment, &block2->data.vorbis_comment);
		case FLAC__METADATA_TYPE_CUESHEET:
			return compare_block_data_cuesheet_(&block1->data.cue_sheet, &block2->data.cue_sheet);
		default:
			return compare_block_data_unknown_(&block1->data.unknown, &block2->data.unknown, block1->length);
	}
}

FLAC_API FLAC__bool FLAC__metadata_object_application_set_data(FLAC__StreamMetadata *object, FLAC__byte *data, unsigned length, FLAC__bool copy)
{
	FLAC__byte *save;

	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_APPLICATION);
	FLAC__ASSERT((0 != data && length > 0) || (0 == data && length == 0 && copy == false));

	save = object->data.application.data;

	/* do the copy first so that if we fail we leave the object untouched */
	if(copy) {
		if(!copy_bytes_(&object->data.application.data, data, length))
			return false;
	}
	else {
		object->data.application.data = data;
	}

	if(0 != save)
		free(save);

	object->length = FLAC__STREAM_METADATA_APPLICATION_ID_LEN / 8 + length;
	return true;
}

FLAC_API FLAC__bool FLAC__metadata_object_seektable_resize_points(FLAC__StreamMetadata *object, unsigned new_num_points)
{
	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);

	if(0 == object->data.seek_table.points) {
		FLAC__ASSERT(object->data.seek_table.num_points == 0);
		if(0 == new_num_points)
			return true;
		else if(0 == (object->data.seek_table.points = seekpoint_array_new_(new_num_points)))
			return false;
	}
	else {
		const unsigned old_size = object->data.seek_table.num_points * sizeof(FLAC__StreamMetadata_SeekPoint);
		const unsigned new_size = new_num_points * sizeof(FLAC__StreamMetadata_SeekPoint);

		FLAC__ASSERT(object->data.seek_table.num_points > 0);

		if(new_size == 0) {
			free(object->data.seek_table.points);
			object->data.seek_table.points = 0;
		}
		else if(0 == (object->data.seek_table.points = (FLAC__StreamMetadata_SeekPoint*)realloc(object->data.seek_table.points, new_size)))
			return false;

		/* if growing, set new elements to placeholders */
		if(new_size > old_size) {
			unsigned i;
			for(i = object->data.seek_table.num_points; i < new_num_points; i++) {
				object->data.seek_table.points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
				object->data.seek_table.points[i].stream_offset = 0;
				object->data.seek_table.points[i].frame_samples = 0;
			}
		}
	}

	object->data.seek_table.num_points = new_num_points;

	seektable_calculate_length_(object);
	return true;
}

FLAC_API void FLAC__metadata_object_seektable_set_point(FLAC__StreamMetadata *object, unsigned point_num, FLAC__StreamMetadata_SeekPoint point)
{
	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
	FLAC__ASSERT(point_num < object->data.seek_table.num_points);

	object->data.seek_table.points[point_num] = point;
}

FLAC_API FLAC__bool FLAC__metadata_object_seektable_insert_point(FLAC__StreamMetadata *object, unsigned point_num, FLAC__StreamMetadata_SeekPoint point)
{
	int i;

	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
	FLAC__ASSERT(point_num <= object->data.seek_table.num_points);

	if(!FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points+1))
		return false;

	/* move all points >= point_num forward one space */
	for(i = (int)object->data.seek_table.num_points-1; i > (int)point_num; i--)
		object->data.seek_table.points[i] = object->data.seek_table.points[i-1];

	FLAC__metadata_object_seektable_set_point(object, point_num, point);
	seektable_calculate_length_(object);
	return true;
}

FLAC_API FLAC__bool FLAC__metadata_object_seektable_delete_point(FLAC__StreamMetadata *object, unsigned point_num)
{
	unsigned i;

	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
	FLAC__ASSERT(point_num < object->data.seek_table.num_points);

	/* move all points > point_num backward one space */
	for(i = point_num; i < object->data.seek_table.num_points-1; i++)
		object->data.seek_table.points[i] = object->data.seek_table.points[i+1];

	return FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points-1);
}

FLAC_API FLAC__bool FLAC__metadata_object_seektable_is_legal(const FLAC__StreamMetadata *object)
{
	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);

	return FLAC__format_seektable_is_legal(&object->data.seek_table);
}

FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_placeholders(FLAC__StreamMetadata *object, unsigned num)
{
	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);

	if(num > 0)
		/* WATCHOUT: we rely on the fact that growing the array adds PLACEHOLDERS at the end */
		return FLAC__metadata_object_seektable_resize_points(object, object->data.seek_table.num_points + num);
	else
		return true;
}

FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_point(FLAC__StreamMetadata *object, FLAC__uint64 sample_number)
{
	FLAC__StreamMetadata_SeekTable *seek_table;

	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);

	seek_table = &object->data.seek_table;

	if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + 1))
		return false;

	seek_table->points[seek_table->num_points - 1].sample_number = sample_number;
	seek_table->points[seek_table->num_points - 1].stream_offset = 0;
	seek_table->points[seek_table->num_points - 1].frame_samples = 0;

	return true;
}

FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_points(FLAC__StreamMetadata *object, FLAC__uint64 sample_numbers[], unsigned num)
{
	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
	FLAC__ASSERT(0 != sample_numbers || num == 0);

	if(num > 0) {
		FLAC__StreamMetadata_SeekTable *seek_table = &object->data.seek_table;
		unsigned i, j;

		i = seek_table->num_points;

		if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + num))
			return false;

		for(j = 0; j < num; i++, j++) {
			seek_table->points[i].sample_number = sample_numbers[j];
			seek_table->points[i].stream_offset = 0;
			seek_table->points[i].frame_samples = 0;
		}
	}

	return true;
}

FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_append_spaced_points(FLAC__StreamMetadata *object, unsigned num, FLAC__uint64 total_samples)
{
	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);
	FLAC__ASSERT(total_samples > 0);

	if(num > 0) {
		FLAC__StreamMetadata_SeekTable *seek_table = &object->data.seek_table;
		unsigned i, j;

		i = seek_table->num_points;

		if(!FLAC__metadata_object_seektable_resize_points(object, seek_table->num_points + num))
			return false;

		for(j = 0; j < num; i++, j++) {
			seek_table->points[i].sample_number = total_samples * (FLAC__uint64)j / (FLAC__uint64)num;
			seek_table->points[i].stream_offset = 0;
			seek_table->points[i].frame_samples = 0;
		}
	}

	return true;
}

FLAC_API FLAC__bool FLAC__metadata_object_seektable_template_sort(FLAC__StreamMetadata *object, FLAC__bool compact)
{
	unsigned unique;

	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_SEEKTABLE);

	unique = FLAC__format_seektable_sort(&object->data.seek_table);

	return !compact || FLAC__metadata_object_seektable_resize_points(object, unique);
}

FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_vendor_string(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
{
	if(!FLAC__format_vorbiscomment_entry_value_is_legal(entry.entry, entry.length))
		return false;
	return vorbiscomment_set_entry_(object, &object->data.vorbis_comment.vendor_string, &entry, copy);
}

FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_resize_comments(FLAC__StreamMetadata *object, unsigned new_num_comments)
{
	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);

	if(0 == object->data.vorbis_comment.comments) {
		FLAC__ASSERT(object->data.vorbis_comment.num_comments == 0);
		if(0 == new_num_comments)
			return true;
		else if(0 == (object->data.vorbis_comment.comments = vorbiscomment_entry_array_new_(new_num_comments)))
			return false;
	}
	else {
		const unsigned old_size = object->data.vorbis_comment.num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry);
		const unsigned new_size = new_num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry);

		FLAC__ASSERT(object->data.vorbis_comment.num_comments > 0);

		/* if shrinking, free the truncated entries */
		if(new_num_comments < object->data.vorbis_comment.num_comments) {
			unsigned i;
			for(i = new_num_comments; i < object->data.vorbis_comment.num_comments; i++)
				if(0 != object->data.vorbis_comment.comments[i].entry)
					free(object->data.vorbis_comment.comments[i].entry);
		}

		if(new_size == 0) {
			free(object->data.vorbis_comment.comments);
			object->data.vorbis_comment.comments = 0;
		}
		else if(0 == (object->data.vorbis_comment.comments = (FLAC__StreamMetadata_VorbisComment_Entry*)realloc(object->data.vorbis_comment.comments, new_size)))
			return false;

		/* if growing, zero all the length/pointers of new elements */
		if(new_size > old_size)
			memset(object->data.vorbis_comment.comments + object->data.vorbis_comment.num_comments, 0, new_size - old_size);
	}

	object->data.vorbis_comment.num_comments = new_num_comments;

	vorbiscomment_calculate_length_(object);
	return true;
}

FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_set_comment(FLAC__StreamMetadata *object, unsigned comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
{
	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(comment_num < object->data.vorbis_comment.num_comments);

	if(!FLAC__format_vorbiscomment_entry_is_legal(entry.entry, entry.length))
		return false;
	return vorbiscomment_set_entry_(object, &object->data.vorbis_comment.comments[comment_num], &entry, copy);
}

FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_insert_comment(FLAC__StreamMetadata *object, unsigned comment_num, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
{
	FLAC__StreamMetadata_VorbisComment *vc;

	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
	FLAC__ASSERT(comment_num <= object->data.vorbis_comment.num_comments);

	if(!FLAC__format_vorbiscomment_entry_is_legal(entry.entry, entry.length))
		return false;

	vc = &object->data.vorbis_comment;

	if(!FLAC__metadata_object_vorbiscomment_resize_comments(object, vc->num_comments+1))
		return false;

	/* move all comments >= comment_num forward one space */
	memmove(&vc->comments[comment_num+1], &vc->comments[comment_num], sizeof(FLAC__StreamMetadata_VorbisComment_Entry)*(vc->num_comments-1-comment_num));
	vc->comments[comment_num].length = 0;
	vc->comments[comment_num].entry = 0;

	return FLAC__metadata_object_vorbiscomment_set_comment(object, comment_num, entry, copy);
}

FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_append_comment(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool copy)
{
	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
	return FLAC__metadata_object_vorbiscomment_insert_comment(object, object->data.vorbis_comment.num_comments, entry, copy);
}

FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_replace_comment(FLAC__StreamMetadata *object, FLAC__StreamMetadata_VorbisComment_Entry entry, FLAC__bool all, FLAC__bool copy)
{
	FLAC__ASSERT(0 != entry.entry && entry.length > 0);

	if(!FLAC__format_vorbiscomment_entry_is_legal(entry.entry, entry.length))
		return false;

	{
		int i;
		unsigned field_name_length;
		const FLAC__byte *eq = (FLAC__byte*)memchr(entry.entry, '=', entry.length);

		FLAC__ASSERT(0 != eq);

		if(0 == eq)
			return false; /* double protection */

		field_name_length = eq-entry.entry;

		if((i = vorbiscomment_find_entry_from_(object, 0, entry.entry, field_name_length)) >= 0) {
			unsigned index = (unsigned)i;
			if(!FLAC__metadata_object_vorbiscomment_set_comment(object, index, entry, copy))
				return false;
			if(all && (index+1 < object->data.vorbis_comment.num_comments)) {
				for(i = vorbiscomment_find_entry_from_(object, index+1, entry.entry, field_name_length); i >= 0; ) {
					if(!FLAC__metadata_object_vorbiscomment_delete_comment(object, (unsigned)i))
						return false;
					if((unsigned)i < object->data.vorbis_comment.num_comments)
						i = vorbiscomment_find_entry_from_(object, (unsigned)i, entry.entry, field_name_length);
					else
						i = -1;
				}
			}
			return true;
		}
		else
			return FLAC__metadata_object_vorbiscomment_append_comment(object, entry, copy);
	}
}

FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_delete_comment(FLAC__StreamMetadata *object, unsigned comment_num)
{
	FLAC__StreamMetadata_VorbisComment *vc;

	FLAC__ASSERT(0 != object);
	FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
	FLAC__ASSERT(comment_num < object->data.vorbis_comment.num_comments);

	vc = &object->data.vorbis_comment;

	/* free the comment at comment_num */
	if(0 != vc->comments[comment_num].entry)