operations.c

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.

		case OP__SHOW_BPS:
		case OP__SHOW_TOTAL_SAMPLES:
		case OP__SET_MD5SUM:
		case OP__SET_MIN_BLOCKSIZE:
		case OP__SET_MAX_BLOCKSIZE:
		case OP__SET_MIN_FRAMESIZE:
		case OP__SET_MAX_FRAMESIZE:
		case OP__SET_SAMPLE_RATE:
		case OP__SET_CHANNELS:
		case OP__SET_BPS:
		case OP__SET_TOTAL_SAMPLES:
			ok = do_shorthand_operation__streaminfo(filename, prefix_with_filename, chain, operation, needs_write);
			break;
		case OP__SHOW_VC_VENDOR:
		case OP__SHOW_VC_FIELD:
		case OP__REMOVE_VC_ALL:
		case OP__REMOVE_VC_FIELD:
		case OP__REMOVE_VC_FIRSTFIELD:
		case OP__SET_VC_FIELD:
		case OP__IMPORT_VC_FROM:
		case OP__EXPORT_VC_TO:
			ok = do_shorthand_operation__vorbis_comment(filename, prefix_with_filename, chain, operation, needs_write, !utf8_convert);
			break;
		case OP__IMPORT_CUESHEET_FROM:
		case OP__EXPORT_CUESHEET_TO:
			ok = do_shorthand_operation__cuesheet(filename, chain, operation, needs_write);
			break;
		case OP__ADD_SEEKPOINT:
			ok = do_shorthand_operation__add_seekpoints(filename, chain, operation->argument.add_seekpoint.specification, needs_write);
			break;
		case OP__ADD_REPLAY_GAIN:
			/* this command is always executed last */
			ok = true;
			break;
		case OP__ADD_PADDING:
			ok = do_shorthand_operation__add_padding(filename, chain, operation->argument.add_padding.length, needs_write);
			break;
		default:
			ok = false;
			FLAC__ASSERT(0);
			break;
	};

	return ok;
}

FLAC__bool do_shorthand_operation__add_replay_gain(char **filenames, unsigned num_files, FLAC__bool preserve_modtime)
{
	FLAC__StreamMetadata streaminfo;
	float *title_gains = 0, *title_peaks = 0;
	float album_gain, album_peak;
	unsigned sample_rate = 0;
	unsigned bits_per_sample = 0;
	unsigned channels = 0;
	unsigned i;
	const char *error;
	FLAC__bool first = true;

	FLAC__ASSERT(num_files > 0);

	for(i = 0; i < num_files; i++) {
		FLAC__ASSERT(0 != filenames[i]);
		if(!FLAC__metadata_get_streaminfo(filenames[i], &streaminfo)) {
			fprintf(stderr, "%s: ERROR: can't open file or get STREAMINFO block\n", filenames[i]);
			return false;
		}
		if(first) {
			first = false;
			sample_rate = streaminfo.data.stream_info.sample_rate;
			bits_per_sample = streaminfo.data.stream_info.bits_per_sample;
			channels = streaminfo.data.stream_info.channels;
		}
		else {
			if(sample_rate != streaminfo.data.stream_info.sample_rate) {
				fprintf(stderr, "%s: ERROR: sample rate of %u Hz does not match previous files' %u Hz\n", filenames[i], streaminfo.data.stream_info.sample_rate, sample_rate);
				return false;
			}
			if(bits_per_sample != streaminfo.data.stream_info.bits_per_sample) {
				fprintf(stderr, "%s: ERROR: resolution of %u bps does not match previous files' %u bps\n", filenames[i], streaminfo.data.stream_info.bits_per_sample, bits_per_sample);
				return false;
			}
			if(channels != streaminfo.data.stream_info.channels) {
				fprintf(stderr, "%s: ERROR: # channels (%u) does not match previous files' (%u)\n", filenames[i], streaminfo.data.stream_info.channels, channels);
				return false;
			}
		}
		if(!grabbag__replaygain_is_valid_sample_frequency(sample_rate)) {
			fprintf(stderr, "%s: ERROR: sample rate of %u Hz is not supported\n", filenames[i], sample_rate);
			return false;
		}
		if(channels != 1 && channels != 2) {
			fprintf(stderr, "%s: ERROR: # of channels (%u) is not supported, must be 1 or 2\n", filenames[i], channels);
			return false;
		}
	}
	FLAC__ASSERT(bits_per_sample >= FLAC__MIN_BITS_PER_SAMPLE && bits_per_sample <= FLAC__MAX_BITS_PER_SAMPLE);

	if(!grabbag__replaygain_init(sample_rate)) {
		FLAC__ASSERT(0);
		/* double protection */
		fprintf(stderr, "internal error\n");
		return false;
	}

	if(
		0 == (title_gains = (float*)malloc(sizeof(float) * num_files)) ||
		0 == (title_peaks = (float*)malloc(sizeof(float) * num_files))
	)
		die("out of memory allocating space for title gains/peaks");

	for(i = 0; i < num_files; i++) {
		if(0 != (error = grabbag__replaygain_analyze_file(filenames[i], title_gains+i, title_peaks+i))) {
			fprintf(stderr, "%s: ERROR: during analysis (%s)\n", filenames[i], error);
			free(title_gains);
			free(title_peaks);
			return false;
		}
	}
	grabbag__replaygain_get_album(&album_gain, &album_peak);

	for(i = 0; i < num_files; i++) {
		if(0 != (error = grabbag__replaygain_store_to_file(filenames[i], album_gain, album_peak, title_gains[i], title_peaks[i], preserve_modtime))) {
			fprintf(stderr, "%s: ERROR: writing tags (%s)\n", filenames[i], error);
			free(title_gains);
			free(title_peaks);
			return false;
		}
	}

	free(title_gains);
	free(title_peaks);
	return true;
}

FLAC__bool do_shorthand_operation__add_padding(const char *filename, FLAC__Metadata_Chain *chain, unsigned length, FLAC__bool *needs_write)
{
	FLAC__StreamMetadata *padding = 0;
	FLAC__Metadata_Iterator *iterator = FLAC__metadata_iterator_new();

	if(0 == iterator)
		die("out of memory allocating iterator");

	FLAC__metadata_iterator_init(iterator, chain);

	while(FLAC__metadata_iterator_next(iterator))
		;

	padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING);
	if(0 == padding)
		die("out of memory allocating PADDING block");

	padding->length = length;

	if(!FLAC__metadata_iterator_insert_block_after(iterator, padding)) {
		print_error_with_chain_status(chain, "%s: ERROR: adding new PADDING block to metadata", filename);
		FLAC__metadata_object_delete(padding);
		FLAC__metadata_iterator_delete(iterator);
		return false;
	}

	FLAC__metadata_iterator_delete(iterator);
	*needs_write = true;
	return true;
}

FLAC__bool passes_filter(const CommandLineOptions *options, const FLAC__StreamMetadata *block, unsigned block_number)
{
	unsigned i, j;
	FLAC__bool matches_number = false, matches_type = false;
	FLAC__bool has_block_number_arg = false;

	for(i = 0; i < options->args.num_arguments; i++) {
		if(options->args.arguments[i].type == ARG__BLOCK_TYPE || options->args.arguments[i].type == ARG__EXCEPT_BLOCK_TYPE) {
			for(j = 0; j < options->args.arguments[i].value.block_type.num_entries; j++) {
				if(options->args.arguments[i].value.block_type.entries[j].type == block->type) {
					if(block->type != FLAC__METADATA_TYPE_APPLICATION || !options->args.arguments[i].value.block_type.entries[j].filter_application_by_id || 0 == memcmp(options->args.arguments[i].value.block_type.entries[j].application_id, block->data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8))
						matches_type = true;
				}
			}
		}
		else if(options->args.arguments[i].type == ARG__BLOCK_NUMBER) {
			has_block_number_arg = true;
			for(j = 0; j < options->args.arguments[i].value.block_number.num_entries; j++) {
				if(options->args.arguments[i].value.block_number.entries[j] == block_number)
					matches_number = true;
			}
		}
	}

	if(!has_block_number_arg)
		matches_number = true;

	if(options->args.checks.has_block_type) {
		FLAC__ASSERT(!options->args.checks.has_except_block_type);
	}
	else if(options->args.checks.has_except_block_type)
		matches_type = !matches_type;
	else
		matches_type = true;

	return matches_number && matches_type;
}

void write_metadata(const char *filename, FLAC__StreamMetadata *block, unsigned block_number, FLAC__bool raw, FLAC__bool hexdump_application)
{
	unsigned i, j;

/*@@@ yuck, should do this with a varargs function or something: */
#define PPR if(filename)printf("%s:",filename);
	PPR; printf("METADATA block #%u\n", block_number);
	PPR; printf("  type: %u (%s)\n", (unsigned)block->type, block->type < FLAC__METADATA_TYPE_UNDEFINED? FLAC__MetadataTypeString[block->type] : "UNKNOWN");
	PPR; printf("  is last: %s\n", block->is_last? "true":"false");
	PPR; printf("  length: %u\n", block->length);

	switch(block->type) {
		case FLAC__METADATA_TYPE_STREAMINFO:
			PPR; printf("  minumum blocksize: %u samples\n", block->data.stream_info.min_blocksize);
			PPR; printf("  maximum blocksize: %u samples\n", block->data.stream_info.max_blocksize);
			PPR; printf("  minimum framesize: %u bytes\n", block->data.stream_info.min_framesize);
			PPR; printf("  maximum framesize: %u bytes\n", block->data.stream_info.max_framesize);
			PPR; printf("  sample_rate: %u Hz\n", block->data.stream_info.sample_rate);
			PPR; printf("  channels: %u\n", block->data.stream_info.channels);
			PPR; printf("  bits-per-sample: %u\n", block->data.stream_info.bits_per_sample);
#ifdef _MSC_VER
			PPR; printf("  total samples: %I64u\n", block->data.stream_info.total_samples);
#else
			PPR; printf("  total samples: %llu\n", block->data.stream_info.total_samples);
#endif
			PPR; printf("  MD5 signature: ");
			for(i = 0; i < 16; i++) {
				printf("%02x", (unsigned)block->data.stream_info.md5sum[i]);
			}
			printf("\n");
			break;
		case FLAC__METADATA_TYPE_PADDING:
			/* nothing to print */
			break;
		case FLAC__METADATA_TYPE_APPLICATION:
			PPR; printf("  application ID: ");
			for(i = 0; i < 4; i++)
				printf("%02x", block->data.application.id[i]);
			printf("\n");
			PPR; printf("  data contents:\n");
			if(0 != block->data.application.data) {
				if(hexdump_application)
					hexdump(filename, block->data.application.data, block->length - FLAC__STREAM_METADATA_HEADER_LENGTH, "    ");
				else
					(void) local_fwrite(block->data.application.data, 1, block->length - FLAC__STREAM_METADATA_HEADER_LENGTH, stdout);
			}
			break;
		case FLAC__METADATA_TYPE_SEEKTABLE:
			PPR; printf("  seek points: %u\n", block->data.seek_table.num_points);
			for(i = 0; i < block->data.seek_table.num_points; i++) {
				if(block->data.seek_table.points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER) {
#ifdef _MSC_VER
					PPR; printf("    point %u: sample_number=%I64u, stream_offset=%I64u, frame_samples=%u\n", i, block->data.seek_table.points[i].sample_number, block->data.seek_table.points[i].stream_offset, block->data.seek_table.points[i].frame_samples);
#else
					PPR; printf("    point %u: sample_number=%llu, stream_offset=%llu, frame_samples=%u\n", i, block->data.seek_table.points[i].sample_number, block->data.seek_table.points[i].stream_offset, block->data.seek_table.points[i].frame_samples);
#endif
				}
				else {
					PPR; printf("    point %u: PLACEHOLDER\n", i);
				}
			}
			break;
		case FLAC__METADATA_TYPE_VORBIS_COMMENT:
			PPR; printf("  vendor string: ");
			write_vc_field(0, &block->data.vorbis_comment.vendor_string, raw, stdout);
			PPR; printf("  comments: %u\n", block->data.vorbis_comment.num_comments);
			for(i = 0; i < block->data.vorbis_comment.num_comments; i++) {
				PPR; printf("    comment[%u]: ", i);
				write_vc_field(0, &block->data.vorbis_comment.comments[i], raw, stdout);
			}
			break;
		case FLAC__METADATA_TYPE_CUESHEET:
			PPR; printf("  media catalog number: %s\n", block->data.cue_sheet.media_catalog_number);
#ifdef _MSC_VER
			PPR; printf("  lead-in: %I64u\n", block->data.cue_sheet.lead_in);
#else
			PPR; printf("  lead-in: %llu\n", block->data.cue_sheet.lead_in);
#endif
			PPR; printf("  is CD: %s\n", block->data.cue_sheet.is_cd? "true":"false");
			PPR; printf("  number of tracks: %u\n", block->data.cue_sheet.num_tracks);
			for(i = 0; i < block->data.cue_sheet.num_tracks; i++) {
				const FLAC__StreamMetadata_CueSheet_Track *track = block->data.cue_sheet.tracks+i;
				const FLAC__bool is_last = (i == block->data.cue_sheet.num_tracks-1);
				const FLAC__bool is_leadout = is_last && track->num_indices == 0;
				PPR; printf("    track[%u]\n", i);
#ifdef _MSC_VER
				PPR; printf("      offset: %I64u\n", track->offset);
#else
				PPR; printf("      offset: %llu\n", track->offset);
#endif
				if(is_last) {
					PPR; printf("      number: %u (%s)\n", (unsigned)track->number, is_leadout? "LEAD-OUT" : "INVALID");
				}
				else {
					PPR; printf("      number: %u\n", (unsigned)track->number);
				}
				if(!is_leadout) {
					PPR; printf("      ISRC: %s\n", track->isrc);
					PPR; printf("      type: %s\n", track->type == 1? "DATA" : "AUDIO");
					PPR; printf("      pre-emphasis: %s\n", track->pre_emphasis? "true":"false");
					PPR; printf("      number of index points: %u\n", track->num_indices);
					for(j = 0; j < track->num_indices; j++) {
						const FLAC__StreamMetadata_CueSheet_Index *index = track->indices+j;
						PPR; printf("        index[%u]\n", j);
#ifdef _MSC_VER
						PPR; printf("          offset: %I64u\n", index->offset);
#else
						PPR; printf("          offset: %llu\n", index->offset);
#endif
						PPR; printf("          number: %u\n", (unsigned)index->number);
					}
				}
			}
			break;
		default:
			PPR; printf("  data contents:\n");
			if(0 != block->data.unknown.data)
				hexdump(filename, block->data.unknown.data, block->length, "    ");
			break;
	}
#undef PPR
}