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/* example_cpp_decode_file - Simple FLAC file decoder using libFLAC
* Copyright (C) 2007-2009 Josh Coalson
* Copyright (C) 2011-2016 Xiph.Org Foundation
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* This example shows how to use libFLAC++ to decode a FLAC file to a WAVE
* file. It only supports 16-bit stereo files.
*
* Complete API documentation can be found at:
* http://xiph.org/flac/api/
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include "FLAC++/decoder.h"
#include "share/compat.h"
static FLAC__uint64 total_samples = 0;
static uint32_t sample_rate = 0;
static uint32_t channels = 0;
static uint32_t bps = 0;
static bool write_little_endian_uint16(FILE *f, FLAC__uint16 x)
{
return
fputc(x, f) != EOF &&
fputc(x >> 8, f) != EOF
;
}
static bool write_little_endian_int16(FILE *f, FLAC__int16 x)
{
return write_little_endian_uint16(f, (FLAC__uint16)x);
}
static bool write_little_endian_uint32(FILE *f, FLAC__uint32 x)
{
return
fputc(x, f) != EOF &&
fputc(x >> 8, f) != EOF &&
fputc(x >> 16, f) != EOF &&
fputc(x >> 24, f) != EOF
;
}
class OurDecoder: public FLAC::Decoder::File {
public:
OurDecoder(FILE *f_): FLAC::Decoder::File(), f(f_) { }
protected:
FILE *f;
virtual ::FLAC__StreamDecoderWriteStatus write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
virtual void metadata_callback(const ::FLAC__StreamMetadata *metadata);
virtual void error_callback(::FLAC__StreamDecoderErrorStatus status);
private:
OurDecoder(const OurDecoder&);
OurDecoder&operator=(const OurDecoder&);
};
int main(int argc, char *argv[])
{
bool ok = true;
FILE *fout;
if(argc != 3) {
fprintf(stderr, "usage: %s infile.flac outfile.wav\n", argv[0]);
return 1;
}
if((fout = fopen(argv[2], "wb")) == NULL) {
fprintf(stderr, "ERROR: opening %s for output\n", argv[2]);
return 1;
}
OurDecoder decoder(fout);
if(!decoder) {
fprintf(stderr, "ERROR: allocating decoder\n");
fclose(fout);
return 1;
}
(void)decoder.set_md5_checking(true);
FLAC__StreamDecoderInitStatus init_status = decoder.init(argv[1]);
if(init_status != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
fprintf(stderr, "ERROR: initializing decoder: %s\n", FLAC__StreamDecoderInitStatusString[init_status]);
ok = false;
}
if(ok) {
ok = decoder.process_until_end_of_stream();
fprintf(stderr, "decoding: %s\n", ok? "succeeded" : "FAILED");
fprintf(stderr, " state: %s\n", decoder.get_state().resolved_as_cstring(decoder));
}
fclose(fout);
return 0;
}
::FLAC__StreamDecoderWriteStatus OurDecoder::write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[])
{
const FLAC__uint32 total_size = (FLAC__uint32)(total_samples * channels * (bps/8));
size_t i;
// Update data
channels = OurDecoder::get_channels();
bps = OurDecoder::get_bits_per_sample();
if(total_samples == 0) {
fprintf(stderr, "ERROR: this example only works for FLAC files that have a total_samples count in STREAMINFO\n");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
if(channels != 2 || bps != 16) {
fprintf(stderr, "ERROR: this example only supports 16bit stereo streams\n");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
/* write WAVE header before we write the first frame */
if(frame->header.number.sample_number == 0) {
if(
fwrite("RIFF", 1, 4, f) < 4 ||
!write_little_endian_uint32(f, total_size + 36) ||
fwrite("WAVEfmt ", 1, 8, f) < 8 ||
!write_little_endian_uint32(f, 16) ||
!write_little_endian_uint16(f, 1) ||
!write_little_endian_uint16(f, (FLAC__uint16)channels) ||
!write_little_endian_uint32(f, sample_rate) ||
!write_little_endian_uint32(f, sample_rate * channels * (bps/8)) ||
!write_little_endian_uint16(f, (FLAC__uint16)(channels * (bps/8))) || /* block align */
!write_little_endian_uint16(f, (FLAC__uint16)bps) ||
fwrite("data", 1, 4, f) < 4 ||
!write_little_endian_uint32(f, total_size)
) {
fprintf(stderr, "ERROR: write error\n");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
}
/* write decoded PCM samples */
for(i = 0; i < frame->header.blocksize; i++) {
if(
!write_little_endian_int16(f, (FLAC__int16)buffer[0][i]) || /* left channel */
!write_little_endian_int16(f, (FLAC__int16)buffer[1][i]) /* right channel */
) {
fprintf(stderr, "ERROR: write error\n");
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
}
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
void OurDecoder::metadata_callback(const ::FLAC__StreamMetadata *metadata)
{
/* print some stats */
if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
/* save for later */
total_samples = metadata->data.stream_info.total_samples;
sample_rate = metadata->data.stream_info.sample_rate;
channels = metadata->data.stream_info.channels;
bps = metadata->data.stream_info.bits_per_sample;
fprintf(stderr, "sample rate : %u Hz\n", sample_rate);
fprintf(stderr, "channels : %u\n", channels);
fprintf(stderr, "bits per sample: %u\n", bps);
fprintf(stderr, "total samples : %" PRIu64 "\n", total_samples);
}
}
void OurDecoder::error_callback(::FLAC__StreamDecoderErrorStatus status)
{
fprintf(stderr, "Got error callback: %s\n", FLAC__StreamDecoderErrorStatusString[status]);
}
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