1 /* example_cpp_decode_file - Simple FLAC file decoder using libFLAC
2 * Copyright (C) 2007,2008,2009 Josh Coalson
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 * This example shows how to use libFLAC++ to decode a FLAC file to a WAVE
21 * file. It only supports 16-bit stereo files.
23 * Complete API documentation can be found at:
24 * http://flac.sourceforge.net/api/
34 #define __STDC_FORMAT_MACROS
37 #include "FLAC++/decoder.h"
39 static FLAC__uint64 total_samples = 0;
40 static unsigned sample_rate = 0;
41 static unsigned channels = 0;
42 static unsigned bps = 0;
44 static bool write_little_endian_uint16(FILE *f, FLAC__uint16 x)
48 fputc(x >> 8, f) != EOF
52 static bool write_little_endian_int16(FILE *f, FLAC__int16 x)
54 return write_little_endian_uint16(f, (FLAC__uint16)x);
57 static bool write_little_endian_uint32(FILE *f, FLAC__uint32 x)
61 fputc(x >> 8, f) != EOF &&
62 fputc(x >> 16, f) != EOF &&
63 fputc(x >> 24, f) != EOF
67 class OurDecoder: public FLAC::Decoder::File {
69 OurDecoder(FILE *f_): FLAC::Decoder::File(), f(f_) { }
73 virtual ::FLAC__StreamDecoderWriteStatus write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
74 virtual void metadata_callback(const ::FLAC__StreamMetadata *metadata);
75 virtual void error_callback(::FLAC__StreamDecoderErrorStatus status);
78 int main(int argc, char *argv[])
84 fprintf(stderr, "usage: %s infile.flac outfile.wav\n", argv[0]);
88 if((fout = fopen(argv[2], "wb")) == NULL) {
89 fprintf(stderr, "ERROR: opening %s for output\n", argv[2]);
93 OurDecoder decoder(fout);
96 fprintf(stderr, "ERROR: allocating decoder\n");
101 (void)decoder.set_md5_checking(true);
103 FLAC__StreamDecoderInitStatus init_status = decoder.init(argv[1]);
104 if(init_status != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
105 fprintf(stderr, "ERROR: initializing decoder: %s\n", FLAC__StreamDecoderInitStatusString[init_status]);
110 ok = decoder.process_until_end_of_stream();
111 fprintf(stderr, "decoding: %s\n", ok? "succeeded" : "FAILED");
112 fprintf(stderr, " state: %s\n", decoder.get_state().resolved_as_cstring(decoder));
120 ::FLAC__StreamDecoderWriteStatus OurDecoder::write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[])
122 const FLAC__uint32 total_size = (FLAC__uint32)(total_samples * channels * (bps/8));
125 if(total_samples == 0) {
126 fprintf(stderr, "ERROR: this example only works for FLAC files that have a total_samples count in STREAMINFO\n");
127 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
129 if(channels != 2 || bps != 16) {
130 fprintf(stderr, "ERROR: this example only supports 16bit stereo streams\n");
131 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
134 /* write WAVE header before we write the first frame */
135 if(frame->header.number.sample_number == 0) {
137 fwrite("RIFF", 1, 4, f) < 4 ||
138 !write_little_endian_uint32(f, total_size + 36) ||
139 fwrite("WAVEfmt ", 1, 8, f) < 8 ||
140 !write_little_endian_uint32(f, 16) ||
141 !write_little_endian_uint16(f, 1) ||
142 !write_little_endian_uint16(f, (FLAC__uint16)channels) ||
143 !write_little_endian_uint32(f, sample_rate) ||
144 !write_little_endian_uint32(f, sample_rate * channels * (bps/8)) ||
145 !write_little_endian_uint16(f, (FLAC__uint16)(channels * (bps/8))) || /* block align */
146 !write_little_endian_uint16(f, (FLAC__uint16)bps) ||
147 fwrite("data", 1, 4, f) < 4 ||
148 !write_little_endian_uint32(f, total_size)
150 fprintf(stderr, "ERROR: write error\n");
151 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
155 /* write decoded PCM samples */
156 for(i = 0; i < frame->header.blocksize; i++) {
158 !write_little_endian_int16(f, (FLAC__int16)buffer[0][i]) || /* left channel */
159 !write_little_endian_int16(f, (FLAC__int16)buffer[1][i]) /* right channel */
161 fprintf(stderr, "ERROR: write error\n");
162 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
166 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
169 void OurDecoder::metadata_callback(const ::FLAC__StreamMetadata *metadata)
171 /* print some stats */
172 if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
174 total_samples = metadata->data.stream_info.total_samples;
175 sample_rate = metadata->data.stream_info.sample_rate;
176 channels = metadata->data.stream_info.channels;
177 bps = metadata->data.stream_info.bits_per_sample;
179 fprintf(stderr, "sample rate : %u Hz\n", sample_rate);
180 fprintf(stderr, "channels : %u\n", channels);
181 fprintf(stderr, "bits per sample: %u\n", bps);
182 fprintf(stderr, "total samples : %" PRIu64 "\n", total_samples);
186 void OurDecoder::error_callback(::FLAC__StreamDecoderErrorStatus status)
188 fprintf(stderr, "Got error callback: %s\n", FLAC__StreamDecoderErrorStatusString[status]);