1 /* example_c_decode_file - Simple FLAC file decoder using libFLAC
2 * Copyright (C) 2007-2009 Josh Coalson
3 * Copyright (C) 2011-2016 Xiph.Org Foundation
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 /*
21 * This example shows how to use libFLAC to decode a FLAC file to a WAVE
22 * file. It only supports 16-bit stereo files.
23 *
24 * Complete API documentation can be found at:
25 * http://xiph.org/flac/api/
26 */
27
28 #ifdef HAVE_CONFIG_H
29 # include <config.h>
30 #endif
31
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include "share/compat.h"
35 #include "FLAC/stream_decoder.h"
36
37 static FLAC__StreamDecoderWriteStatus write_callback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
38 static void metadata_callback(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
39 static void error_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
40
41 static FLAC__uint64 total_samples = 0;
42 static unsigned sample_rate = 0;
43 static unsigned channels = 0;
44 static unsigned bps = 0;
45
write_little_endian_uint16(FILE * f,FLAC__uint16 x)46 static FLAC__bool write_little_endian_uint16(FILE *f, FLAC__uint16 x)
47 {
48 return
49 fputc(x, f) != EOF &&
50 fputc(x >> 8, f) != EOF
51 ;
52 }
53
write_little_endian_int16(FILE * f,FLAC__int16 x)54 static FLAC__bool write_little_endian_int16(FILE *f, FLAC__int16 x)
55 {
56 return write_little_endian_uint16(f, (FLAC__uint16)x);
57 }
58
write_little_endian_uint32(FILE * f,FLAC__uint32 x)59 static FLAC__bool write_little_endian_uint32(FILE *f, FLAC__uint32 x)
60 {
61 return
62 fputc(x, f) != EOF &&
63 fputc(x >> 8, f) != EOF &&
64 fputc(x >> 16, f) != EOF &&
65 fputc(x >> 24, f) != EOF
66 ;
67 }
68
main(int argc,char * argv[])69 int main(int argc, char *argv[])
70 {
71 FLAC__bool ok = true;
72 FLAC__StreamDecoder *decoder = 0;
73 FLAC__StreamDecoderInitStatus init_status;
74 FILE *fout;
75
76 if(argc != 3) {
77 fprintf(stderr, "usage: %s infile.flac outfile.wav\n", argv[0]);
78 return 1;
79 }
80
81 if((fout = fopen(argv[2], "wb")) == NULL) {
82 fprintf(stderr, "ERROR: opening %s for output\n", argv[2]);
83 return 1;
84 }
85
86 if((decoder = FLAC__stream_decoder_new()) == NULL) {
87 fprintf(stderr, "ERROR: allocating decoder\n");
88 fclose(fout);
89 return 1;
90 }
91
92 (void)FLAC__stream_decoder_set_md5_checking(decoder, true);
93
94 init_status = FLAC__stream_decoder_init_file(decoder, argv[1], write_callback, metadata_callback, error_callback, /*client_data=*/fout);
95 if(init_status != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
96 fprintf(stderr, "ERROR: initializing decoder: %s\n", FLAC__StreamDecoderInitStatusString[init_status]);
97 ok = false;
98 }
99
100 if(ok) {
101 ok = FLAC__stream_decoder_process_until_end_of_stream(decoder);
102 fprintf(stderr, "decoding: %s\n", ok? "succeeded" : "FAILED");
103 fprintf(stderr, " state: %s\n", FLAC__StreamDecoderStateString[FLAC__stream_decoder_get_state(decoder)]);
104 }
105
106 FLAC__stream_decoder_delete(decoder);
107 fclose(fout);
108
109 return 0;
110 }
111
write_callback(const FLAC__StreamDecoder * decoder,const FLAC__Frame * frame,const FLAC__int32 * const buffer[],void * client_data)112 FLAC__StreamDecoderWriteStatus write_callback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
113 {
114 FILE *f = (FILE*)client_data;
115 const FLAC__uint32 total_size = (FLAC__uint32)(total_samples * channels * (bps/8));
116 size_t i;
117
118 (void)decoder;
119
120 if(total_samples == 0) {
121 fprintf(stderr, "ERROR: this example only works for FLAC files that have a total_samples count in STREAMINFO\n");
122 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
123 }
124 if(channels != 2 || bps != 16) {
125 fprintf(stderr, "ERROR: this example only supports 16bit stereo streams\n");
126 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
127 }
128 if(frame->header.channels != 2) {
129 fprintf(stderr, "ERROR: This frame contains %u channels (should be 2)\n", frame->header.channels);
130 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
131 }
132 if(buffer [0] == NULL) {
133 fprintf(stderr, "ERROR: buffer [0] is NULL\n");
134 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
135 }
136 if(buffer [1] == NULL) {
137 fprintf(stderr, "ERROR: buffer [1] is NULL\n");
138 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
139 }
140
141 /* write WAVE header before we write the first frame */
142 if(frame->header.number.sample_number == 0) {
143 if(
144 fwrite("RIFF", 1, 4, f) < 4 ||
145 !write_little_endian_uint32(f, total_size + 36) ||
146 fwrite("WAVEfmt ", 1, 8, f) < 8 ||
147 !write_little_endian_uint32(f, 16) ||
148 !write_little_endian_uint16(f, 1) ||
149 !write_little_endian_uint16(f, (FLAC__uint16)channels) ||
150 !write_little_endian_uint32(f, sample_rate) ||
151 !write_little_endian_uint32(f, sample_rate * channels * (bps/8)) ||
152 !write_little_endian_uint16(f, (FLAC__uint16)(channels * (bps/8))) || /* block align */
153 !write_little_endian_uint16(f, (FLAC__uint16)bps) ||
154 fwrite("data", 1, 4, f) < 4 ||
155 !write_little_endian_uint32(f, total_size)
156 ) {
157 fprintf(stderr, "ERROR: write error\n");
158 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
159 }
160 }
161
162 /* write decoded PCM samples */
163 for(i = 0; i < frame->header.blocksize; i++) {
164 if(
165 !write_little_endian_int16(f, (FLAC__int16)buffer[0][i]) || /* left channel */
166 !write_little_endian_int16(f, (FLAC__int16)buffer[1][i]) /* right channel */
167 ) {
168 fprintf(stderr, "ERROR: write error\n");
169 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
170 }
171 }
172
173 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
174 }
175
metadata_callback(const FLAC__StreamDecoder * decoder,const FLAC__StreamMetadata * metadata,void * client_data)176 void metadata_callback(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
177 {
178 (void)decoder, (void)client_data;
179
180 /* print some stats */
181 if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
182 /* save for later */
183 total_samples = metadata->data.stream_info.total_samples;
184 sample_rate = metadata->data.stream_info.sample_rate;
185 channels = metadata->data.stream_info.channels;
186 bps = metadata->data.stream_info.bits_per_sample;
187
188 fprintf(stderr, "sample rate : %u Hz\n", sample_rate);
189 fprintf(stderr, "channels : %u\n", channels);
190 fprintf(stderr, "bits per sample: %u\n", bps);
191 fprintf(stderr, "total samples : %" PRIu64 "\n", total_samples);
192 }
193 }
194
error_callback(const FLAC__StreamDecoder * decoder,FLAC__StreamDecoderErrorStatus status,void * client_data)195 void error_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
196 {
197 (void)decoder, (void)client_data;
198
199 fprintf(stderr, "Got error callback: %s\n", FLAC__StreamDecoderErrorStatusString[status]);
200 }
201