cannam@86: /* example_cpp_decode_file - Simple FLAC file decoder using libFLAC
cannam@86:  * Copyright (C) 2007  Josh Coalson
cannam@86:  *
cannam@86:  * This program is free software; you can redistribute it and/or
cannam@86:  * modify it under the terms of the GNU General Public License
cannam@86:  * as published by the Free Software Foundation; either version 2
cannam@86:  * of the License, or (at your option) any later version.
cannam@86:  *
cannam@86:  * This program is distributed in the hope that it will be useful,
cannam@86:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
cannam@86:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
cannam@86:  * GNU General Public License for more details.
cannam@86:  *
cannam@86:  * You should have received a copy of the GNU General Public License
cannam@86:  * along with this program; if not, write to the Free Software
cannam@86:  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
cannam@86:  */
cannam@86: 
cannam@86: /*
cannam@86:  * This example shows how to use libFLAC++ to decode a FLAC file to a WAVE
cannam@86:  * file.  It only supports 16-bit stereo files.
cannam@86:  *
cannam@86:  * Complete API documentation can be found at:
cannam@86:  *   http://flac.sourceforge.net/api/
cannam@86:  */
cannam@86: 
cannam@86: #if HAVE_CONFIG_H
cannam@86: #  include <config.h>
cannam@86: #endif
cannam@86: 
cannam@86: #include <stdio.h>
cannam@86: #include <stdlib.h>
cannam@86: #include "FLAC++/decoder.h"
cannam@86: 
cannam@86: static FLAC__uint64 total_samples = 0;
cannam@86: static unsigned sample_rate = 0;
cannam@86: static unsigned channels = 0;
cannam@86: static unsigned bps = 0;
cannam@86: 
cannam@86: static bool write_little_endian_uint16(FILE *f, FLAC__uint16 x)
cannam@86: {
cannam@86: 	return
cannam@86: 		fputc(x, f) != EOF &&
cannam@86: 		fputc(x >> 8, f) != EOF
cannam@86: 	;
cannam@86: }
cannam@86: 
cannam@86: static bool write_little_endian_int16(FILE *f, FLAC__int16 x)
cannam@86: {
cannam@86: 	return write_little_endian_uint16(f, (FLAC__uint16)x);
cannam@86: }
cannam@86: 
cannam@86: static bool write_little_endian_uint32(FILE *f, FLAC__uint32 x)
cannam@86: {
cannam@86: 	return
cannam@86: 		fputc(x, f) != EOF &&
cannam@86: 		fputc(x >> 8, f) != EOF &&
cannam@86: 		fputc(x >> 16, f) != EOF &&
cannam@86: 		fputc(x >> 24, f) != EOF
cannam@86: 	;
cannam@86: }
cannam@86: 
cannam@86: class OurDecoder: public FLAC::Decoder::File {
cannam@86: public:
cannam@86: 	OurDecoder(FILE *f_): FLAC::Decoder::File(), f(f_) { }
cannam@86: protected:
cannam@86: 	FILE *f;
cannam@86: 
cannam@86: 	virtual ::FLAC__StreamDecoderWriteStatus write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
cannam@86: 	virtual void metadata_callback(const ::FLAC__StreamMetadata *metadata);
cannam@86: 	virtual void error_callback(::FLAC__StreamDecoderErrorStatus status);
cannam@86: };
cannam@86: 
cannam@86: int main(int argc, char *argv[])
cannam@86: {
cannam@86: 	bool ok = true;
cannam@86: 	FILE *fout;
cannam@86: 
cannam@86: 	if(argc != 3) {
cannam@86: 		fprintf(stderr, "usage: %s infile.flac outfile.wav\n", argv[0]);
cannam@86: 		return 1;
cannam@86: 	}
cannam@86: 
cannam@86: 	if((fout = fopen(argv[2], "wb")) == NULL) {
cannam@86: 		fprintf(stderr, "ERROR: opening %s for output\n", argv[2]);
cannam@86: 		return 1;
cannam@86: 	}
cannam@86: 
cannam@86: 	OurDecoder decoder(fout);
cannam@86: 
cannam@86: 	if(!decoder) {
cannam@86: 		fprintf(stderr, "ERROR: allocating decoder\n");
cannam@86: 		fclose(fout);
cannam@86: 		return 1;
cannam@86: 	}
cannam@86: 
cannam@86: 	(void)decoder.set_md5_checking(true);
cannam@86: 
cannam@86: 	FLAC__StreamDecoderInitStatus init_status = decoder.init(argv[1]);
cannam@86: 	if(init_status != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
cannam@86: 		fprintf(stderr, "ERROR: initializing decoder: %s\n", FLAC__StreamDecoderInitStatusString[init_status]);
cannam@86: 		ok = false;
cannam@86: 	}
cannam@86: 
cannam@86: 	if(ok) {
cannam@86: 		ok = decoder.process_until_end_of_stream();
cannam@86: 		fprintf(stderr, "decoding: %s\n", ok? "succeeded" : "FAILED");
cannam@86: 		fprintf(stderr, "   state: %s\n", decoder.get_state().resolved_as_cstring(decoder));
cannam@86: 	}
cannam@86: 
cannam@86: 	fclose(fout);
cannam@86: 
cannam@86: 	return 0;
cannam@86: }
cannam@86: 
cannam@86: ::FLAC__StreamDecoderWriteStatus OurDecoder::write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[])
cannam@86: {
cannam@86: 	const FLAC__uint32 total_size = (FLAC__uint32)(total_samples * channels * (bps/8));
cannam@86: 	size_t i;
cannam@86: 
cannam@86: 	if(total_samples == 0) {
cannam@86: 		fprintf(stderr, "ERROR: this example only works for FLAC files that have a total_samples count in STREAMINFO\n");
cannam@86: 		return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
cannam@86: 	}
cannam@86: 	if(channels != 2 || bps != 16) {
cannam@86: 		fprintf(stderr, "ERROR: this example only supports 16bit stereo streams\n");
cannam@86: 		return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
cannam@86: 	}
cannam@86: 
cannam@86: 	/* write WAVE header before we write the first frame */
cannam@86: 	if(frame->header.number.sample_number == 0) {
cannam@86: 		if(
cannam@86: 			fwrite("RIFF", 1, 4, f) < 4 ||
cannam@86: 			!write_little_endian_uint32(f, total_size + 36) ||
cannam@86: 			fwrite("WAVEfmt ", 1, 8, f) < 8 ||
cannam@86: 			!write_little_endian_uint32(f, 16) ||
cannam@86: 			!write_little_endian_uint16(f, 1) ||
cannam@86: 			!write_little_endian_uint16(f, (FLAC__uint16)channels) ||
cannam@86: 			!write_little_endian_uint32(f, sample_rate) ||
cannam@86: 			!write_little_endian_uint32(f, sample_rate * channels * (bps/8)) ||
cannam@86: 			!write_little_endian_uint16(f, (FLAC__uint16)(channels * (bps/8))) || /* block align */
cannam@86: 			!write_little_endian_uint16(f, (FLAC__uint16)bps) ||
cannam@86: 			fwrite("data", 1, 4, f) < 4 ||
cannam@86: 			!write_little_endian_uint32(f, total_size)
cannam@86: 		) {
cannam@86: 			fprintf(stderr, "ERROR: write error\n");
cannam@86: 			return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
cannam@86: 		}
cannam@86: 	}
cannam@86: 
cannam@86: 	/* write decoded PCM samples */
cannam@86: 	for(i = 0; i < frame->header.blocksize; i++) {
cannam@86: 		if(
cannam@86: 			!write_little_endian_int16(f, (FLAC__int16)buffer[0][i]) ||  /* left channel */
cannam@86: 			!write_little_endian_int16(f, (FLAC__int16)buffer[1][i])     /* right channel */
cannam@86: 		) {
cannam@86: 			fprintf(stderr, "ERROR: write error\n");
cannam@86: 			return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
cannam@86: 		}
cannam@86: 	}
cannam@86: 
cannam@86: 	return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
cannam@86: }
cannam@86: 
cannam@86: void OurDecoder::metadata_callback(const ::FLAC__StreamMetadata *metadata)
cannam@86: {
cannam@86: 	/* print some stats */
cannam@86: 	if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
cannam@86: 		/* save for later */
cannam@86: 		total_samples = metadata->data.stream_info.total_samples;
cannam@86: 		sample_rate = metadata->data.stream_info.sample_rate;
cannam@86: 		channels = metadata->data.stream_info.channels;
cannam@86: 		bps = metadata->data.stream_info.bits_per_sample;
cannam@86: 
cannam@86: 		fprintf(stderr, "sample rate    : %u Hz\n", sample_rate);
cannam@86: 		fprintf(stderr, "channels       : %u\n", channels);
cannam@86: 		fprintf(stderr, "bits per sample: %u\n", bps);
cannam@86: #ifdef _MSC_VER
cannam@86: 		fprintf(stderr, "total samples  : %I64u\n", total_samples);
cannam@86: #else
cannam@86: 		fprintf(stderr, "total samples  : %llu\n", total_samples);
cannam@86: #endif
cannam@86: 	}
cannam@86: }
cannam@86: 
cannam@86: void OurDecoder::error_callback(::FLAC__StreamDecoderErrorStatus status)
cannam@86: {
cannam@86: 	fprintf(stderr, "Got error callback: %s\n", FLAC__StreamDecoderErrorStatusString[status]);
cannam@86: }