1/* example_cpp_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 "FLAC++/metadata.h" 34#include "FLAC++/encoder.h" 35 36class OurEncoder: public FLAC::Encoder::File { 37public: 38 OurEncoder(): FLAC::Encoder::File() { } 39protected: 40 virtual void progress_callback(FLAC__uint64 bytes_written, FLAC__uint64 samples_written, unsigned frames_written, unsigned total_frames_estimate); 41}; 42 43#define READSIZE 1024 44 45static unsigned total_samples = 0; /* can use a 32-bit number due to WAVE size limitations */ 46static FLAC__byte buffer[READSIZE/*samples*/ * 2/*bytes_per_sample*/ * 2/*channels*/]; /* we read the WAVE data into here */ 47static FLAC__int32 pcm[READSIZE/*samples*/ * 2/*channels*/]; 48static FLAC__int32 *pcm_[2] = { pcm, pcm+READSIZE }; 49 50int main(int argc, char *argv[]) 51{ 52 bool ok = true; 53 OurEncoder encoder; 54 FLAC__StreamEncoderInitStatus init_status; 55 FLAC__StreamMetadata *metadata[2]; 56 FLAC__StreamMetadata_VorbisComment_Entry entry; 57 FILE *fin; 58 unsigned sample_rate = 0; 59 unsigned channels = 0; 60 unsigned bps = 0; 61 62 if(argc != 3) { 63 fprintf(stderr, "usage: %s infile.wav outfile.flac\n", argv[0]); 64 return 1; 65 } 66 67 if((fin = fopen(argv[1], "rb")) == NULL) { 68 fprintf(stderr, "ERROR: opening %s for output\n", argv[1]); 69 return 1; 70 } 71 72 /* read wav header and validate it */ 73 if( 74 fread(buffer, 1, 44, fin) != 44 || 75 memcmp(buffer, "RIFF", 4) || 76 memcmp(buffer+8, "WAVEfmt \020\000\000\000\001\000\002\000", 16) || 77 memcmp(buffer+32, "\004\000\020\000data", 8) 78 ) { 79 fprintf(stderr, "ERROR: invalid/unsupported WAVE file, only 16bps stereo WAVE in canonical form allowed\n"); 80 fclose(fin); 81 return 1; 82 } 83 sample_rate = ((((((unsigned)buffer[27] << 8) | buffer[26]) << 8) | buffer[25]) << 8) | buffer[24]; 84 channels = 2; 85 bps = 16; 86 total_samples = (((((((unsigned)buffer[43] << 8) | buffer[42]) << 8) | buffer[41]) << 8) | buffer[40]) / 4; 87 88 /* check the encoder */ 89 if(!encoder) { 90 fprintf(stderr, "ERROR: allocating encoder\n"); 91 fclose(fin); 92 return 1; 93 } 94 95 ok &= encoder.set_verify(true); 96 ok &= encoder.set_compression_level(5); 97 ok &= encoder.set_channels(channels); 98 ok &= encoder.set_bits_per_sample(bps); 99 ok &= encoder.set_sample_rate(sample_rate); 100 ok &= encoder.set_total_samples_estimate(total_samples); 101 102 /* now add some metadata; we'll add some tags and a padding block */ 103 if(ok) { 104 if( 105 (metadata[0] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT)) == NULL || 106 (metadata[1] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)) == NULL || 107 /* there are many tag (vorbiscomment) functions but these are convenient for this particular use: */ 108 !FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "ARTIST", "Some Artist") || 109 !FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, /*copy=*/false) || /* copy=false: let metadata object take control of entry's allocated string */ 110 !FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "YEAR", "1984") || 111 !FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, /*copy=*/false) 112 ) { 113 fprintf(stderr, "ERROR: out of memory or tag error\n"); 114 ok = false; 115 } 116 117 metadata[1]->length = 1234; /* set the padding length */ 118 119 ok = encoder.set_metadata(metadata, 2); 120 } 121 122 /* initialize encoder */ 123 if(ok) { 124 init_status = encoder.init(argv[2]); 125 if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) { 126 fprintf(stderr, "ERROR: initializing encoder: %s\n", FLAC__StreamEncoderInitStatusString[init_status]); 127 ok = false; 128 } 129 } 130 131 /* read blocks of samples from WAVE file and feed to encoder */ 132 if(ok) { 133 size_t left = (size_t)total_samples; 134 while(ok && left) { 135 size_t need = (left>READSIZE? (size_t)READSIZE : (size_t)left); 136 if(fread(buffer, channels*(bps/8), need, fin) != need) { 137 fprintf(stderr, "ERROR: reading from WAVE file\n"); 138 ok = false; 139 } 140 else { 141 /* convert the packed little-endian 16-bit PCM samples from WAVE into an interleaved FLAC__int32 buffer for libFLAC */ 142 size_t i; 143 for(i = 0; i < need*channels; i++) { 144 /* inefficient but simple and works on big- or little-endian machines */ 145 pcm[i] = (FLAC__int32)(((FLAC__int16)(FLAC__int8)buffer[2*i+1] << 8) | (FLAC__int16)buffer[2*i]); 146 } 147 /* feed samples to encoder */ 148 ok = encoder.process_interleaved(pcm, need); 149 } 150 left -= need; 151 } 152 } 153 154 ok &= encoder.finish(); 155 156 fprintf(stderr, "encoding: %s\n", ok? "succeeded" : "FAILED"); 157 fprintf(stderr, " state: %s\n", encoder.get_state().resolved_as_cstring(encoder)); 158 159 /* now that encoding is finished, the metadata can be freed */ 160 FLAC__metadata_object_delete(metadata[0]); 161 FLAC__metadata_object_delete(metadata[1]); 162 163 fclose(fin); 164 165 return 0; 166} 167 168void OurEncoder::progress_callback(FLAC__uint64 bytes_written, FLAC__uint64 samples_written, unsigned frames_written, unsigned total_frames_estimate) 169{ 170#ifdef _MSC_VER 171 fprintf(stderr, "wrote %I64u bytes, %I64u/%u samples, %u/%u frames\n", bytes_written, samples_written, total_samples, frames_written, total_frames_estimate); 172#else 173 fprintf(stderr, "wrote %llu bytes, %llu/%u samples, %u/%u frames\n", bytes_written, samples_written, total_samples, frames_written, total_frames_estimate); 174#endif 175} 176