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#include <string.h>
36
37class OurEncoder: public FLAC::Encoder::File {
38public:
39	OurEncoder(): FLAC::Encoder::File() { }
40protected:
41	virtual void progress_callback(FLAC__uint64 bytes_written, FLAC__uint64 samples_written, unsigned frames_written, unsigned total_frames_estimate);
42};
43
44#define READSIZE 1024
45
46static unsigned total_samples = 0; /* can use a 32-bit number due to WAVE size limitations */
47static FLAC__byte buffer[READSIZE/*samples*/ * 2/*bytes_per_sample*/ * 2/*channels*/]; /* we read the WAVE data into here */
48static FLAC__int32 pcm[READSIZE/*samples*/ * 2/*channels*/];
49static FLAC__int32 *pcm_[2] = { pcm, pcm+READSIZE };
50
51int main(int argc, char *argv[])
52{
53	bool ok = true;
54	OurEncoder encoder;
55	FLAC__StreamEncoderInitStatus init_status;
56	FLAC__StreamMetadata *metadata[2];
57	FLAC__StreamMetadata_VorbisComment_Entry entry;
58	FILE *fin;
59	unsigned sample_rate = 0;
60	unsigned channels = 0;
61	unsigned bps = 0;
62
63	if(argc != 3) {
64		fprintf(stderr, "usage: %s infile.wav outfile.flac\n", argv[0]);
65		return 1;
66	}
67
68	if((fin = fopen(argv[1], "rb")) == NULL) {
69		fprintf(stderr, "ERROR: opening %s for output\n", argv[1]);
70		return 1;
71	}
72
73	/* read wav header and validate it */
74	if(
75		fread(buffer, 1, 44, fin) != 44 ||
76		memcmp(buffer, "RIFF", 4) ||
77		memcmp(buffer+8, "WAVEfmt \020\000\000\000\001\000\002\000", 16) ||
78		memcmp(buffer+32, "\004\000\020\000data", 8)
79	) {
80		fprintf(stderr, "ERROR: invalid/unsupported WAVE file, only 16bps stereo WAVE in canonical form allowed\n");
81		fclose(fin);
82		return 1;
83	}
84	sample_rate = ((((((unsigned)buffer[27] << 8) | buffer[26]) << 8) | buffer[25]) << 8) | buffer[24];
85	channels = 2;
86	bps = 16;
87	total_samples = (((((((unsigned)buffer[43] << 8) | buffer[42]) << 8) | buffer[41]) << 8) | buffer[40]) / 4;
88
89	/* check the encoder */
90	if(!encoder) {
91		fprintf(stderr, "ERROR: allocating encoder\n");
92		fclose(fin);
93		return 1;
94	}
95
96	ok &= encoder.set_verify(true);
97	ok &= encoder.set_compression_level(5);
98	ok &= encoder.set_channels(channels);
99	ok &= encoder.set_bits_per_sample(bps);
100	ok &= encoder.set_sample_rate(sample_rate);
101	ok &= encoder.set_total_samples_estimate(total_samples);
102
103	/* now add some metadata; we'll add some tags and a padding block */
104	if(ok) {
105		if(
106			(metadata[0] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT)) == NULL ||
107			(metadata[1] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)) == NULL ||
108			/* there are many tag (vorbiscomment) functions but these are convenient for this particular use: */
109			!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "ARTIST", "Some Artist") ||
110			!FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, /*copy=*/false) || /* copy=false: let metadata object take control of entry's allocated string */
111			!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "YEAR", "1984") ||
112			!FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, /*copy=*/false)
113		) {
114			fprintf(stderr, "ERROR: out of memory or tag error\n");
115			ok = false;
116		}
117
118		metadata[1]->length = 1234; /* set the padding length */
119
120		ok = encoder.set_metadata(metadata, 2);
121	}
122
123	/* initialize encoder */
124	if(ok) {
125		init_status = encoder.init(argv[2]);
126		if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
127			fprintf(stderr, "ERROR: initializing encoder: %s\n", FLAC__StreamEncoderInitStatusString[init_status]);
128			ok = false;
129		}
130	}
131
132	/* read blocks of samples from WAVE file and feed to encoder */
133	if(ok) {
134		size_t left = (size_t)total_samples;
135		while(ok && left) {
136			size_t need = (left>READSIZE? (size_t)READSIZE : (size_t)left);
137			if(fread(buffer, channels*(bps/8), need, fin) != need) {
138				fprintf(stderr, "ERROR: reading from WAVE file\n");
139				ok = false;
140			}
141			else {
142				/* convert the packed little-endian 16-bit PCM samples from WAVE into an interleaved FLAC__int32 buffer for libFLAC */
143				size_t i;
144				for(i = 0; i < need*channels; i++) {
145					/* inefficient but simple and works on big- or little-endian machines */
146					pcm[i] = (FLAC__int32)(((FLAC__int16)(FLAC__int8)buffer[2*i+1] << 8) | (FLAC__int16)buffer[2*i]);
147				}
148				/* feed samples to encoder */
149				ok = encoder.process_interleaved(pcm, need);
150			}
151			left -= need;
152		}
153	}
154
155	ok &= encoder.finish();
156
157	fprintf(stderr, "encoding: %s\n", ok? "succeeded" : "FAILED");
158	fprintf(stderr, "   state: %s\n", encoder.get_state().resolved_as_cstring(encoder));
159
160	/* now that encoding is finished, the metadata can be freed */
161	FLAC__metadata_object_delete(metadata[0]);
162	FLAC__metadata_object_delete(metadata[1]);
163
164	fclose(fin);
165
166	return 0;
167}
168
169void OurEncoder::progress_callback(FLAC__uint64 bytes_written, FLAC__uint64 samples_written, unsigned frames_written, unsigned total_frames_estimate)
170{
171#ifdef _MSC_VER
172	fprintf(stderr, "wrote %I64u bytes, %I64u/%u samples, %u/%u frames\n", bytes_written, samples_written, total_samples, frames_written, total_frames_estimate);
173#else
174	fprintf(stderr, "wrote %llu bytes, %llu/%u samples, %u/%u frames\n", bytes_written, samples_written, total_samples, frames_written, total_frames_estimate);
175#endif
176}
177