1 /* example_c_encode_file - Simple FLAC file encoder using libFLAC
2 * Copyright (C) 2007 Josh Coalson
3 *
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.
8 *
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.
13 *
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.
17 */
18
19 /*
20 * This example shows how to use libFLAC to encode a WAVE file to a FLAC
21 * file. It only supports 16-bit stereo files in canonical WAVE format.
22 *
23 * Complete API documentation can be found at:
24 * http://flac.sourceforge.net/api/
25 */
26
27 #if HAVE_CONFIG_H
28 # include <config.h>
29 #endif
30
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include "FLAC/metadata.h"
35 #include "FLAC/stream_encoder.h"
36
37 static void progress_callback(const FLAC__StreamEncoder *encoder, FLAC__uint64 bytes_written, FLAC__uint64 samples_written, unsigned frames_written, unsigned total_frames_estimate, void *client_data);
38
39 #define READSIZE 1024
40
41 static unsigned total_samples = 0; /* can use a 32-bit number due to WAVE size limitations */
42 static FLAC__byte buffer[READSIZE/*samples*/ * 2/*bytes_per_sample*/ * 2/*channels*/]; /* we read the WAVE data into here */
43 static FLAC__int32 pcm[READSIZE/*samples*/ * 2/*channels*/];
44
main(int argc,char * argv[])45 int main(int argc, char *argv[])
46 {
47 FLAC__bool ok = true;
48 FLAC__StreamEncoder *encoder = 0;
49 FLAC__StreamEncoderInitStatus init_status;
50 FLAC__StreamMetadata *metadata[2];
51 FLAC__StreamMetadata_VorbisComment_Entry entry;
52 FILE *fin;
53 unsigned sample_rate = 0;
54 unsigned channels = 0;
55 unsigned bps = 0;
56
57 if(argc != 3) {
58 fprintf(stderr, "usage: %s infile.wav outfile.flac\n", argv[0]);
59 return 1;
60 }
61
62 if((fin = fopen(argv[1], "rb")) == NULL) {
63 fprintf(stderr, "ERROR: opening %s for output\n", argv[1]);
64 return 1;
65 }
66
67 /* read wav header and validate it */
68 if(
69 fread(buffer, 1, 44, fin) != 44 ||
70 memcmp(buffer, "RIFF", 4) ||
71 memcmp(buffer+8, "WAVEfmt \020\000\000\000\001\000\002\000", 16) ||
72 memcmp(buffer+32, "\004\000\020\000data", 8)
73 ) {
74 fprintf(stderr, "ERROR: invalid/unsupported WAVE file, only 16bps stereo WAVE in canonical form allowed\n");
75 fclose(fin);
76 return 1;
77 }
78 sample_rate = ((((((unsigned)buffer[27] << 8) | buffer[26]) << 8) | buffer[25]) << 8) | buffer[24];
79 channels = 2;
80 bps = 16;
81 total_samples = (((((((unsigned)buffer[43] << 8) | buffer[42]) << 8) | buffer[41]) << 8) | buffer[40]) / 4;
82
83 /* allocate the encoder */
84 if((encoder = FLAC__stream_encoder_new()) == NULL) {
85 fprintf(stderr, "ERROR: allocating encoder\n");
86 fclose(fin);
87 return 1;
88 }
89
90 ok &= FLAC__stream_encoder_set_verify(encoder, true);
91 ok &= FLAC__stream_encoder_set_compression_level(encoder, 5);
92 ok &= FLAC__stream_encoder_set_channels(encoder, channels);
93 ok &= FLAC__stream_encoder_set_bits_per_sample(encoder, bps);
94 ok &= FLAC__stream_encoder_set_sample_rate(encoder, sample_rate);
95 ok &= FLAC__stream_encoder_set_total_samples_estimate(encoder, total_samples);
96
97 /* now add some metadata; we'll add some tags and a padding block */
98 if(ok) {
99 if(
100 (metadata[0] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT)) == NULL ||
101 (metadata[1] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)) == NULL ||
102 /* there are many tag (vorbiscomment) functions but these are convenient for this particular use: */
103 !FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "ARTIST", "Some Artist") ||
104 !FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, /*copy=*/false) || /* copy=false: let metadata object take control of entry's allocated string */
105 !FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "YEAR", "1984") ||
106 !FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, /*copy=*/false)
107 ) {
108 fprintf(stderr, "ERROR: out of memory or tag error\n");
109 ok = false;
110 }
111
112 metadata[1]->length = 1234; /* set the padding length */
113
114 ok = FLAC__stream_encoder_set_metadata(encoder, metadata, 2);
115 }
116
117 /* initialize encoder */
118 if(ok) {
119 init_status = FLAC__stream_encoder_init_file(encoder, argv[2], progress_callback, /*client_data=*/NULL);
120 if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
121 fprintf(stderr, "ERROR: initializing encoder: %s\n", FLAC__StreamEncoderInitStatusString[init_status]);
122 ok = false;
123 }
124 }
125
126 /* read blocks of samples from WAVE file and feed to encoder */
127 if(ok) {
128 size_t left = (size_t)total_samples;
129 while(ok && left) {
130 size_t need = (left>READSIZE? (size_t)READSIZE : (size_t)left);
131 if(fread(buffer, channels*(bps/8), need, fin) != need) {
132 fprintf(stderr, "ERROR: reading from WAVE file\n");
133 ok = false;
134 }
135 else {
136 /* convert the packed little-endian 16-bit PCM samples from WAVE into an interleaved FLAC__int32 buffer for libFLAC */
137 size_t i;
138 for(i = 0; i < need*channels; i++) {
139 /* inefficient but simple and works on big- or little-endian machines */
140 pcm[i] = (FLAC__int32)(((FLAC__int16)(FLAC__int8)buffer[2*i+1] << 8) | (FLAC__int16)buffer[2*i]);
141 }
142 /* feed samples to encoder */
143 ok = FLAC__stream_encoder_process_interleaved(encoder, pcm, need);
144 }
145 left -= need;
146 }
147 }
148
149 ok &= FLAC__stream_encoder_finish(encoder);
150
151 fprintf(stderr, "encoding: %s\n", ok? "succeeded" : "FAILED");
152 fprintf(stderr, " state: %s\n", FLAC__StreamEncoderStateString[FLAC__stream_encoder_get_state(encoder)]);
153
154 /* now that encoding is finished, the metadata can be freed */
155 FLAC__metadata_object_delete(metadata[0]);
156 FLAC__metadata_object_delete(metadata[1]);
157
158 FLAC__stream_encoder_delete(encoder);
159 fclose(fin);
160
161 return 0;
162 }
163
progress_callback(const FLAC__StreamEncoder * encoder,FLAC__uint64 bytes_written,FLAC__uint64 samples_written,unsigned frames_written,unsigned total_frames_estimate,void * client_data)164 void progress_callback(const FLAC__StreamEncoder *encoder, FLAC__uint64 bytes_written, FLAC__uint64 samples_written, unsigned frames_written, unsigned total_frames_estimate, void *client_data)
165 {
166 (void)encoder, (void)client_data;
167
168 #ifdef _MSC_VER
169 fprintf(stderr, "wrote %I64u bytes, %I64u/%u samples, %u/%u frames\n", bytes_written, samples_written, total_samples, frames_written, total_frames_estimate);
170 #else
171 fprintf(stderr, "wrote %llu bytes, %llu/%u samples, %u/%u frames\n", bytes_written, samples_written, total_samples, frames_written, total_frames_estimate);
172 #endif
173 }
174