operations.c

wince下著名的视频播放器源码

/* metaflac - Command-line FLAC metadata editor
 * Copyright (C) 2001,2002,2003,2004,2005  Josh Coalson
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include "operations.h"
#include "usage.h"
#include "utils.h"
#include "FLAC/assert.h"
#include "FLAC/metadata.h"
#include "share/grabbag.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static void show_version();
static FLAC__bool do_major_operation(const CommandLineOptions *options);
static FLAC__bool do_major_operation_on_file(const char *filename, const CommandLineOptions *options);
static FLAC__bool do_major_operation__list(const char *filename, FLAC__Metadata_Chain *chain, const CommandLineOptions *options);
static FLAC__bool do_major_operation__append(FLAC__Metadata_Chain *chain, const CommandLineOptions *options);
static FLAC__bool do_major_operation__remove(FLAC__Metadata_Chain *chain, const CommandLineOptions *options);
static FLAC__bool do_major_operation__remove_all(FLAC__Metadata_Chain *chain, const CommandLineOptions *options);
static FLAC__bool do_shorthand_operations(const CommandLineOptions *options);
static FLAC__bool do_shorthand_operations_on_file(const char *filename, const CommandLineOptions *options);
static FLAC__bool do_shorthand_operation(const char *filename, FLAC__bool prefix_with_filename, FLAC__Metadata_Chain *chain, const Operation *operation, FLAC__bool *needs_write, FLAC__bool utf8_convert);
static FLAC__bool do_shorthand_operation__add_replay_gain(char **filenames, unsigned num_files, FLAC__bool preserve_modtime);
static FLAC__bool do_shorthand_operation__add_padding(const char *filename, FLAC__Metadata_Chain *chain, unsigned length, FLAC__bool *needs_write);

static FLAC__bool passes_filter(const CommandLineOptions *options, const FLAC__StreamMetadata *block, unsigned block_number);
static void write_metadata(const char *filename, FLAC__StreamMetadata *block, unsigned block_number, FLAC__bool raw, FLAC__bool hexdump_application);

/* from operations_shorthand_seektable.c */
extern FLAC__bool do_shorthand_operation__add_seekpoints(const char *filename, FLAC__Metadata_Chain *chain, const char *specification, FLAC__bool *needs_write);

/* from operations_shorthand_streaminfo.c */
extern FLAC__bool do_shorthand_operation__streaminfo(const char *filename, FLAC__bool prefix_with_filename, FLAC__Metadata_Chain *chain, const Operation *operation, FLAC__bool *needs_write);

/* from operations_shorthand_vorbiscomment.c */
extern FLAC__bool do_shorthand_operation__vorbis_comment(const char *filename, FLAC__bool prefix_with_filename, FLAC__Metadata_Chain *chain, const Operation *operation, FLAC__bool *needs_write, FLAC__bool raw);

/* from operations_shorthand_cuesheet.c */
extern FLAC__bool do_shorthand_operation__cuesheet(const char *filename, FLAC__Metadata_Chain *chain, const Operation *operation, FLAC__bool *needs_write);


FLAC__bool do_operations(const CommandLineOptions *options)
{
	FLAC__bool ok = true;

	if(options->show_long_help) {
		long_usage(0);
	}
	if(options->show_version) {
		show_version();
	}
	else if(options->args.checks.num_major_ops > 0) {
		FLAC__ASSERT(options->args.checks.num_shorthand_ops == 0);
		FLAC__ASSERT(options->args.checks.num_major_ops == 1);
		FLAC__ASSERT(options->args.checks.num_major_ops == options->ops.num_operations);
		ok = do_major_operation(options);
	}
	else if(options->args.checks.num_shorthand_ops > 0) {
		FLAC__ASSERT(options->args.checks.num_shorthand_ops == options->ops.num_operations);
		ok = do_shorthand_operations(options);
	}

	return ok;
}

/*
 * local routines
 */

void show_version()
{
	printf("metaflac %s\n", FLAC__VERSION_STRING);
}

FLAC__bool do_major_operation(const CommandLineOptions *options)
{
	unsigned i;
	FLAC__bool ok = true;

	/*@@@ to die after first error,  v---  add '&& ok' here */
	for(i = 0; i < options->num_files; i++)
		ok &= do_major_operation_on_file(options->filenames[i], options);

	return ok;
}

FLAC__bool do_major_operation_on_file(const char *filename, const CommandLineOptions *options)
{
	FLAC__bool ok = true, needs_write = false;
	FLAC__Metadata_Chain *chain = FLAC__metadata_chain_new();

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

	if(!FLAC__metadata_chain_read(chain, filename)) {
		print_error_with_chain_status(chain, "%s: ERROR: reading metadata", filename);
		FLAC__metadata_chain_delete(chain);
		return false;
	}

	switch(options->ops.operations[0].type) {
		case OP__LIST:
			ok = do_major_operation__list(options->prefix_with_filename? filename : 0, chain, options);
			break;
		case OP__APPEND:
			ok = do_major_operation__append(chain, options);
			needs_write = true;
			break;
		case OP__REMOVE:
			ok = do_major_operation__remove(chain, options);
			needs_write = true;
			break;
		case OP__REMOVE_ALL:
			ok = do_major_operation__remove_all(chain, options);
			needs_write = true;
			break;
		case OP__MERGE_PADDING:
			FLAC__metadata_chain_merge_padding(chain);
			needs_write = true;
			break;
		case OP__SORT_PADDING:
			FLAC__metadata_chain_sort_padding(chain);
			needs_write = true;
			break;
		default:
			FLAC__ASSERT(0);
			return false;
	}

	if(ok && needs_write) {
		if(options->use_padding)
			FLAC__metadata_chain_sort_padding(chain);
		ok = FLAC__metadata_chain_write(chain, options->use_padding, options->preserve_modtime);
		if(!ok)
			print_error_with_chain_status(chain, "%s: ERROR: writing FLAC file", filename);
	}

	FLAC__metadata_chain_delete(chain);

	return ok;
}

FLAC__bool do_major_operation__list(const char *filename, FLAC__Metadata_Chain *chain, const CommandLineOptions *options)
{
	FLAC__Metadata_Iterator *iterator = FLAC__metadata_iterator_new();
	FLAC__StreamMetadata *block;
	FLAC__bool ok = true;
	unsigned block_number;

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

	FLAC__metadata_iterator_init(iterator, chain);

	block_number = 0;
	do {
		block = FLAC__metadata_iterator_get_block(iterator);
		ok &= (0 != block);
		if(!ok)
			fprintf(stderr, "%s: ERROR: couldn't get block from chain\n", filename);
		else if(passes_filter(options, FLAC__metadata_iterator_get_block(iterator), block_number))
			write_metadata(filename, block, block_number, !options->utf8_convert, options->application_data_format_is_hexdump);
		block_number++;
	} while(ok && FLAC__metadata_iterator_next(iterator));

	FLAC__metadata_iterator_delete(iterator);

	return ok;
}

FLAC__bool do_major_operation__append(FLAC__Metadata_Chain *chain, const CommandLineOptions *options)
{
	(void) chain, (void) options;
	fprintf(stderr, "ERROR: --append not implemented yet\n"); /*@@@*/
	return false;
}

FLAC__bool do_major_operation__remove(FLAC__Metadata_Chain *chain, const CommandLineOptions *options)
{
	FLAC__Metadata_Iterator *iterator = FLAC__metadata_iterator_new();
	FLAC__bool ok = true;
	unsigned block_number;

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

	FLAC__metadata_iterator_init(iterator, chain);

	block_number = 0;
	while(ok && FLAC__metadata_iterator_next(iterator)) {
		block_number++;
		if(passes_filter(options, FLAC__metadata_iterator_get_block(iterator), block_number)) {
			ok &= FLAC__metadata_iterator_delete_block(iterator, options->use_padding);
			if(options->use_padding)
				ok &= FLAC__metadata_iterator_next(iterator);
		}
	}

	FLAC__metadata_iterator_delete(iterator);

	return ok;
}

FLAC__bool do_major_operation__remove_all(FLAC__Metadata_Chain *chain, const CommandLineOptions *options)
{
	FLAC__Metadata_Iterator *iterator = FLAC__metadata_iterator_new();
	FLAC__bool ok = true;

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

	FLAC__metadata_iterator_init(iterator, chain);

	while(ok && FLAC__metadata_iterator_next(iterator)) {
		ok &= FLAC__metadata_iterator_delete_block(iterator, options->use_padding);
		if(options->use_padding)
			ok &= FLAC__metadata_iterator_next(iterator);
	}

	FLAC__metadata_iterator_delete(iterator);

	return ok;
}

FLAC__bool do_shorthand_operations(const CommandLineOptions *options)
{
	unsigned i;
	FLAC__bool ok = true;

	/* to die after first error,     v---  add '&& ok' here */
	for(i = 0; i < options->num_files; i++)
		ok &= do_shorthand_operations_on_file(options->filenames[i], options);

	/* check if OP__ADD_REPLAY_GAIN requested */
	if(ok && options->num_files > 0) {
		for(i = 0; i < options->ops.num_operations; i++) {
			if(options->ops.operations[i].type == OP__ADD_REPLAY_GAIN)
				ok = do_shorthand_operation__add_replay_gain(options->filenames, options->num_files, options->preserve_modtime);
		}
	}

	return ok;
}

FLAC__bool do_shorthand_operations_on_file(const char *filename, const CommandLineOptions *options)
{
	unsigned i;
	FLAC__bool ok = true, needs_write = false, use_padding = options->use_padding;
	FLAC__Metadata_Chain *chain = FLAC__metadata_chain_new();

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

	if(!FLAC__metadata_chain_read(chain, filename)) {
		print_error_with_chain_status(chain, "%s: ERROR: reading metadata", filename);
		return false;
	}

	for(i = 0; i < options->ops.num_operations && ok; i++) {
		/*
		 * Do OP__ADD_SEEKPOINT last to avoid decoding twice if both
		 * --add-seekpoint and --import-cuesheet-from are used.
		 */
		if(options->ops.operations[i].type != OP__ADD_SEEKPOINT)
			ok &= do_shorthand_operation(filename, options->prefix_with_filename, chain, &options->ops.operations[i], &needs_write, options->utf8_convert);

		/* The following seems counterintuitive but the meaning
		 * of 'use_padding' is 'try to keep the overall metadata
		 * to its original size, adding or truncating extra
		 * padding if necessary' which is why we need to turn it
		 * off in this case.  If we don't, the extra padding block
		 * will just be truncated.
		 */
		if(options->ops.operations[i].type == OP__ADD_PADDING)
			use_padding = false;
	}

	/*
	 * Do OP__ADD_SEEKPOINT last to avoid decoding twice if both
	 * --add-seekpoint and --import-cuesheet-from are used.
	 */
	for(i = 0; i < options->ops.num_operations && ok; i++) {
		if(options->ops.operations[i].type == OP__ADD_SEEKPOINT)
			ok &= do_shorthand_operation(filename, options->prefix_with_filename, chain, &options->ops.operations[i], &needs_write, options->utf8_convert);
	}

	if(ok && needs_write) {
		if(use_padding)
			FLAC__metadata_chain_sort_padding(chain);
		ok = FLAC__metadata_chain_write(chain, use_padding, options->preserve_modtime);
		if(!ok)
			print_error_with_chain_status(chain, "%s: ERROR: writing FLAC file", filename);
	}

	FLAC__metadata_chain_delete(chain);

	return ok;
}

FLAC__bool do_shorthand_operation(const char *filename, FLAC__bool prefix_with_filename, FLAC__Metadata_Chain *chain, const Operation *operation, FLAC__bool *needs_write, FLAC__bool utf8_convert)
{
	FLAC__bool ok = true;

	switch(operation->type) {
		case OP__SHOW_MD5SUM:
		case OP__SHOW_MIN_BLOCKSIZE:
		case OP__SHOW_MAX_BLOCKSIZE:
		case OP__SHOW_MIN_FRAMESIZE:
		case OP__SHOW_MAX_FRAMESIZE:
		case OP__SHOW_SAMPLE_RATE:
		case OP__SHOW_CHANNELS: