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libsdl2_mixer/external/flac-1.3.2/examples/cpp/decode/file/main.cpp
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libsdl2_mixer/external/flac-1.3.2/examples/cpp/decode/file/main.cpp
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/* example_cpp_decode_file - Simple FLAC file decoder using libFLAC
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* Copyright (C) 2007-2009 Josh Coalson
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* Copyright (C) 2011-2016 Xiph.Org Foundation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* This example shows how to use libFLAC++ to decode a FLAC file to a WAVE
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* file. It only supports 16-bit stereo files.
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*
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* Complete API documentation can be found at:
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* http://xiph.org/flac/api/
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include "FLAC++/decoder.h"
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#include "share/compat.h"
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static FLAC__uint64 total_samples = 0;
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static unsigned sample_rate = 0;
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static unsigned channels = 0;
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static unsigned bps = 0;
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static bool write_little_endian_uint16(FILE *f, FLAC__uint16 x)
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{
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return
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fputc(x, f) != EOF &&
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fputc(x >> 8, f) != EOF
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;
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}
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static bool write_little_endian_int16(FILE *f, FLAC__int16 x)
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{
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return write_little_endian_uint16(f, (FLAC__uint16)x);
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}
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static bool write_little_endian_uint32(FILE *f, FLAC__uint32 x)
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{
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return
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fputc(x, f) != EOF &&
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fputc(x >> 8, f) != EOF &&
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fputc(x >> 16, f) != EOF &&
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fputc(x >> 24, f) != EOF
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;
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}
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class OurDecoder: public FLAC::Decoder::File {
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public:
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OurDecoder(FILE *f_): FLAC::Decoder::File(), f(f_) { }
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protected:
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FILE *f;
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virtual ::FLAC__StreamDecoderWriteStatus write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
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virtual void metadata_callback(const ::FLAC__StreamMetadata *metadata);
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virtual void error_callback(::FLAC__StreamDecoderErrorStatus status);
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private:
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OurDecoder(const OurDecoder&);
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OurDecoder&operator=(const OurDecoder&);
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};
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int main(int argc, char *argv[])
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{
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bool ok = true;
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FILE *fout;
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if(argc != 3) {
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fprintf(stderr, "usage: %s infile.flac outfile.wav\n", argv[0]);
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return 1;
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}
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if((fout = fopen(argv[2], "wb")) == NULL) {
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fprintf(stderr, "ERROR: opening %s for output\n", argv[2]);
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return 1;
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}
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OurDecoder decoder(fout);
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if(!decoder) {
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fprintf(stderr, "ERROR: allocating decoder\n");
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fclose(fout);
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return 1;
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}
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(void)decoder.set_md5_checking(true);
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FLAC__StreamDecoderInitStatus init_status = decoder.init(argv[1]);
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if(init_status != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
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fprintf(stderr, "ERROR: initializing decoder: %s\n", FLAC__StreamDecoderInitStatusString[init_status]);
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ok = false;
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}
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if(ok) {
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ok = decoder.process_until_end_of_stream();
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fprintf(stderr, "decoding: %s\n", ok? "succeeded" : "FAILED");
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fprintf(stderr, " state: %s\n", decoder.get_state().resolved_as_cstring(decoder));
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}
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fclose(fout);
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return 0;
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}
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::FLAC__StreamDecoderWriteStatus OurDecoder::write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[])
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{
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const FLAC__uint32 total_size = (FLAC__uint32)(total_samples * channels * (bps/8));
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size_t i;
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if(total_samples == 0) {
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fprintf(stderr, "ERROR: this example only works for FLAC files that have a total_samples count in STREAMINFO\n");
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return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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}
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if(channels != 2 || bps != 16) {
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fprintf(stderr, "ERROR: this example only supports 16bit stereo streams\n");
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return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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}
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/* write WAVE header before we write the first frame */
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if(frame->header.number.sample_number == 0) {
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if(
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fwrite("RIFF", 1, 4, f) < 4 ||
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!write_little_endian_uint32(f, total_size + 36) ||
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fwrite("WAVEfmt ", 1, 8, f) < 8 ||
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!write_little_endian_uint32(f, 16) ||
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!write_little_endian_uint16(f, 1) ||
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!write_little_endian_uint16(f, (FLAC__uint16)channels) ||
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!write_little_endian_uint32(f, sample_rate) ||
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!write_little_endian_uint32(f, sample_rate * channels * (bps/8)) ||
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!write_little_endian_uint16(f, (FLAC__uint16)(channels * (bps/8))) || /* block align */
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!write_little_endian_uint16(f, (FLAC__uint16)bps) ||
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fwrite("data", 1, 4, f) < 4 ||
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!write_little_endian_uint32(f, total_size)
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) {
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fprintf(stderr, "ERROR: write error\n");
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return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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}
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}
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/* write decoded PCM samples */
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for(i = 0; i < frame->header.blocksize; i++) {
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if(
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!write_little_endian_int16(f, (FLAC__int16)buffer[0][i]) || /* left channel */
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!write_little_endian_int16(f, (FLAC__int16)buffer[1][i]) /* right channel */
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) {
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fprintf(stderr, "ERROR: write error\n");
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return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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}
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}
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return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
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}
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void OurDecoder::metadata_callback(const ::FLAC__StreamMetadata *metadata)
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{
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/* print some stats */
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if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
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/* save for later */
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total_samples = metadata->data.stream_info.total_samples;
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sample_rate = metadata->data.stream_info.sample_rate;
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channels = metadata->data.stream_info.channels;
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bps = metadata->data.stream_info.bits_per_sample;
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fprintf(stderr, "sample rate : %u Hz\n", sample_rate);
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fprintf(stderr, "channels : %u\n", channels);
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fprintf(stderr, "bits per sample: %u\n", bps);
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fprintf(stderr, "total samples : %" PRIu64 "\n", total_samples);
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}
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}
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void OurDecoder::error_callback(::FLAC__StreamDecoderErrorStatus status)
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{
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fprintf(stderr, "Got error callback: %s\n", FLAC__StreamDecoderErrorStatusString[status]);
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}
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