metadata.cpp

这是著名的TCPMP播放器在WINDWOWS,和WINCE下编译通过的源程序.笔者对其中的LIBMAD库做了针对ARM MPU的优化. 并增加了词幕功能.

			FLAC__ASSERT(is_valid());
			return (bool)::FLAC__metadata_object_seektable_is_legal(object_);
		}


		//
		// VorbisComment::Entry
		//

		VorbisComment::Entry::Entry()
		{
			zero();
		}

		VorbisComment::Entry::Entry(const char *field, unsigned field_length)
		{
			zero();
			construct(field, field_length);
		}

		VorbisComment::Entry::Entry(const char *field)
		{
			zero();
			construct(field);
		}

		VorbisComment::Entry::Entry(const char *field_name, const char *field_value, unsigned field_value_length)
		{
			zero();
			construct(field_name, field_value, field_value_length);
		}

		VorbisComment::Entry::Entry(const char *field_name, const char *field_value)
		{
			zero();
			construct(field_name, field_value);
		}

		VorbisComment::Entry::Entry(const Entry &entry)
		{
			FLAC__ASSERT(entry.is_valid());
			zero();
			construct((const char *)entry.entry_.entry, entry.entry_.length);
		}

		VorbisComment::Entry &VorbisComment::Entry::operator=(const Entry &entry)
		{
			FLAC__ASSERT(entry.is_valid());
			clear();
			construct((const char *)entry.entry_.entry, entry.entry_.length);
			return *this;
		}

		VorbisComment::Entry::~Entry()
		{
			clear();
		}

		bool VorbisComment::Entry::is_valid() const
		{
			return is_valid_;
		}

		unsigned VorbisComment::Entry::get_field_length() const
		{
			FLAC__ASSERT(is_valid());
			return entry_.length;
		}

		unsigned VorbisComment::Entry::get_field_name_length() const
		{
			FLAC__ASSERT(is_valid());
			return field_name_length_;
		}

		unsigned VorbisComment::Entry::get_field_value_length() const
		{
			FLAC__ASSERT(is_valid());
			return field_value_length_;
		}

		::FLAC__StreamMetadata_VorbisComment_Entry VorbisComment::Entry::get_entry() const
		{
			FLAC__ASSERT(is_valid());
			return entry_;
		}

		const char *VorbisComment::Entry::get_field() const
		{
			FLAC__ASSERT(is_valid());
			return (const char *)entry_.entry;
		}

		const char *VorbisComment::Entry::get_field_name() const
		{
			FLAC__ASSERT(is_valid());
			return field_name_;
		}

		const char *VorbisComment::Entry::get_field_value() const
		{
			FLAC__ASSERT(is_valid());
			return field_value_;
		}

		bool VorbisComment::Entry::set_field(const char *field, unsigned field_length)
		{
			FLAC__ASSERT(is_valid());
			FLAC__ASSERT(0 != field);

			if(!::FLAC__format_vorbiscomment_entry_is_legal((const ::FLAC__byte*)field, field_length))
				return is_valid_ = false;

			clear_entry();

			if(0 == (entry_.entry = (FLAC__byte*)malloc(field_length+1))) {
				is_valid_ = false;
			}
			else {
				entry_.length = field_length;
				memcpy(entry_.entry, field, field_length);
				entry_.entry[field_length] = '\0';
				(void) parse_field();
			}

			return is_valid_;
		}

		bool VorbisComment::Entry::set_field(const char *field)
		{
			return set_field(field, strlen(field));
		}

		bool VorbisComment::Entry::set_field_name(const char *field_name)
		{
			FLAC__ASSERT(is_valid());
			FLAC__ASSERT(0 != field_name);

			if(!::FLAC__format_vorbiscomment_entry_name_is_legal(field_name))
				return is_valid_ = false;

			clear_field_name();

			if(0 == (field_name_ = strdup(field_name))) {
				is_valid_ = false;
			}
			else {
				field_name_length_ = strlen(field_name_);
				compose_field();
			}

			return is_valid_;
		}

		bool VorbisComment::Entry::set_field_value(const char *field_value, unsigned field_value_length)
		{
			FLAC__ASSERT(is_valid());
			FLAC__ASSERT(0 != field_value);

			if(!::FLAC__format_vorbiscomment_entry_value_is_legal((const FLAC__byte*)field_value, field_value_length))
				return is_valid_ = false;

			clear_field_value();

			if(0 == (field_value_ = (char *)malloc(field_value_length+1))) {
				is_valid_ = false;
			}
			else {
				field_value_length_ = field_value_length;
				memcpy(field_value_, field_value, field_value_length);
				field_value_[field_value_length] = '\0';
				compose_field();
			}

			return is_valid_;
		}

		bool VorbisComment::Entry::set_field_value(const char *field_value)
		{
			return set_field_value(field_value, strlen(field_value));
		}

		void VorbisComment::Entry::zero()
		{
			is_valid_ = true;
			entry_.length = 0;
			entry_.entry = 0;
			field_name_ = 0;
			field_name_length_ = 0;
			field_value_ = 0;
			field_value_length_ = 0;
		}

		void VorbisComment::Entry::clear()
		{
			clear_entry();
			clear_field_name();
			clear_field_value();
			is_valid_ = true;
		}

		void VorbisComment::Entry::clear_entry()
		{
			if(0 != entry_.entry) {
				free(entry_.entry);
				entry_.entry = 0;
				entry_.length = 0;
			}
		}

		void VorbisComment::Entry::clear_field_name()
		{
			if(0 != field_name_) {
				free(field_name_);
				field_name_ = 0;
				field_name_length_ = 0;
			}
		}

		void VorbisComment::Entry::clear_field_value()
		{
			if(0 != field_value_) {
				free(field_value_);
				field_value_ = 0;
				field_value_length_ = 0;
			}
		}

		void VorbisComment::Entry::construct(const char *field, unsigned field_length)
		{
			if(set_field(field, field_length))
				parse_field();
		}

		void VorbisComment::Entry::construct(const char *field)
		{
			construct(field, strlen(field));
		}

		void VorbisComment::Entry::construct(const char *field_name, const char *field_value, unsigned field_value_length)
		{
			if(set_field_name(field_name) && set_field_value(field_value, field_value_length))
				compose_field();
		}

		void VorbisComment::Entry::construct(const char *field_name, const char *field_value)
		{
			construct(field_name, field_value, strlen(field_value));
		}

		void VorbisComment::Entry::compose_field()
		{
			clear_entry();

			if(0 == (entry_.entry = (FLAC__byte*)malloc(field_name_length_ + 1 + field_value_length_ + 1))) {
				is_valid_ = false;
			}
			else {
				memcpy(entry_.entry, field_name_, field_name_length_);
				entry_.length += field_name_length_;
				memcpy(entry_.entry + entry_.length, "=", 1);
				entry_.length += 1;
				memcpy(entry_.entry + entry_.length, field_value_, field_value_length_);
				entry_.length += field_value_length_;
				entry_.entry[entry_.length] = '\0';
				is_valid_ = true;
			}
		}

		void VorbisComment::Entry::parse_field()
		{
			clear_field_name();
			clear_field_value();

			const char *p = (const char *)memchr(entry_.entry, '=', entry_.length);

			if(0 == p)
				p = (const char *)entry_.entry + entry_.length;

			field_name_length_ = p - (const char *)entry_.entry;
			if(0 == (field_name_ = (char *)malloc(field_name_length_ + 1))) { // +1 for the trailing \0
				is_valid_ = false;
				return;
			}
			memcpy(field_name_, entry_.entry, field_name_length_);
			field_name_[field_name_length_] = '\0';

			if(entry_.length - field_name_length_ == 0) {
				field_value_length_ = 0;
				if(0 == (field_value_ = (char *)malloc(0))) {
					is_valid_ = false;
					return;
				}
			}
			else {
				field_value_length_ = entry_.length - field_name_length_ - 1;
				if(0 == (field_value_ = (char *)malloc(field_value_length_ + 1))) { // +1 for the trailing \0
					is_valid_ = false;
					return;
				}
				memcpy(field_value_, ++p, field_value_length_);
				field_value_[field_value_length_] = '\0';
			}

			is_valid_ = true;
		}


		//
		// VorbisComment
		//

		VorbisComment::VorbisComment():
		Prototype(FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT), /*copy=*/false)
		{ }

		VorbisComment::~VorbisComment()
		{ }

		unsigned VorbisComment::get_num_comments() const
		{
			FLAC__ASSERT(is_valid());
			return object_->data.vorbis_comment.num_comments;
		}

		const FLAC__byte *VorbisComment::get_vendor_string() const
		{
			FLAC__ASSERT(is_valid());
			return object_->data.vorbis_comment.vendor_string.entry;
		}

		VorbisComment::Entry VorbisComment::get_comment(unsigned index) const
		{
			FLAC__ASSERT(is_valid());
			FLAC__ASSERT(index < object_->data.vorbis_comment.num_comments);
			return Entry((const char *)object_->data.vorbis_comment.comments[index].entry, object_->data.vorbis_comment.comments[index].length);
		}

		bool VorbisComment::set_vendor_string(const FLAC__byte *string)
		{
			FLAC__ASSERT(is_valid());
			// vendor_string is a special kind of entry
			const ::FLAC__StreamMetadata_VorbisComment_Entry vendor_string = { strlen((const char *)string), (FLAC__byte*)string }; // we can cheat on const-ness because we make a copy below:
			return (bool)::FLAC__metadata_object_vorbiscomment_set_vendor_string(object_, vendor_string, /*copy=*/true);
		}

		bool VorbisComment::set_comment(unsigned index, const VorbisComment::Entry &entry)
		{
			FLAC__ASSERT(is_valid());
			FLAC__ASSERT(index < object_->data.vorbis_comment.num_comments);
			return (bool)::FLAC__metadata_object_vorbiscomment_set_comment(object_, index, entry.get_entry(), /*copy=*/true);
		}

		bool VorbisComment::insert_comment(unsigned index, const VorbisComment::Entry &entry)
		{
			FLAC__ASSERT(is_valid());
			FLAC__ASSERT(index <= object_->data.vorbis_comment.num_comments);
			return (bool)::FLAC__metadata_object_vorbiscomment_insert_comment(object_, index, entry.get_entry(), /*copy=*/true);
		}

		bool VorbisComment::append_comment(const VorbisComment::Entry &entry)
		{
			FLAC__ASSERT(is_valid());
			return (bool)::FLAC__metadata_object_vorbiscomment_append_comment(object_, entry.get_entry(), /*copy=*/true);
		}

		bool VorbisComment::delete_comment(unsigned index)
		{
			FLAC__ASSERT(is_valid());
			FLAC__ASSERT(index < object_->data.vorbis_comment.num_comments);
			return (bool)::FLAC__metadata_object_vorbiscomment_delete_comment(object_, index);
		}


		//
		// CueSheet::Track
		//

		CueSheet::Track::Track():
		object_(::FLAC__metadata_object_cuesheet_track_new())
		{ }

		CueSheet::Track::Track(const ::FLAC__StreamMetadata_CueSheet_Track *track):
		object_(::FLAC__metadata_object_cuesheet_track_clone(track))
		{ }

		CueSheet::Track::Track(const Track &track):
		object_(::FLAC__metadata_object_cuesheet_track_clone(track.object_))
		{ }

		CueSheet::Track &CueSheet::Track::operator=(const Track &track)
		{
			if(0 != object_)
				::FLAC__metadata_object_cuesheet_track_delete(object_);
			object_ = ::FLAC__metadata_object_cuesheet_track_clone(track.object_);
			return *this;
		}

		CueSheet::Track::~Track()
		{
			if(0 != object_)
				::FLAC__metadata_object_cuesheet_track_delete(object_);
		}

		bool CueSheet::Track::is_valid() const
		{
			return(0 != object_);
		}

		::FLAC__StreamMetadata_CueSheet_Index CueSheet::Track::get_index(unsigned i) const
		{
			FLAC__ASSERT(is_valid());
			FLAC__ASSERT(i < object_->num_indices);
			return object_->indices[i];
		}

		void CueSheet::Track::set_isrc(const char value[12])
		{
			FLAC__ASSERT(is_valid());
			FLAC__ASSERT(0 != value);
			memcpy(object_->isrc, value, 12);
			object_->isrc[12] = '\0';
		}

		void CueSheet::Track::set_type(unsigned value)
		{
			FLAC__ASSERT(is_valid());
			FLAC__ASSERT(value <= 1);
			object_->type = value;
		}

 		void CueSheet::Track::set_index(unsigned i, const ::FLAC__StreamMetadata_CueSheet_Index &index)
 		{
 			FLAC__ASSERT(is_valid());
 			FLAC__ASSERT(i < object_->num_indices);
 			object_->indices[i] = index;
 		}


		//
		// CueSheet
		//

		CueSheet::CueSheet():
		Prototype(FLAC__metadata_object_new(FLAC__METADATA_TYPE_CUESHEET), /*copy=*/false)
		{ }

		CueSheet::~CueSheet()
		{ }

		const char *CueSheet::get_media_catalog_number() const
		{
			FLAC__ASSERT(is_valid());
			return object_->data.cue_sheet.media_catalog_number;
		}