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libsdl2_mixer/external/flac-1.3.2/examples/c/encode/file/main.c
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libsdl2_mixer/external/flac-1.3.2/examples/c/encode/file/main.c
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/* example_c_encode_file - Simple FLAC file encoder using libFLAC
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* Copyright (C) 2007-2009 Josh Coalson
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* Copyright (C) 2011-2016 Xiph.Org Foundation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* This example shows how to use libFLAC to encode a WAVE file to a FLAC
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* file. It only supports 16-bit stereo files in canonical WAVE format.
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*
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* Complete API documentation can be found at:
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* http://xiph.org/flac/api/
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "share/compat.h"
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#include "FLAC/metadata.h"
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#include "FLAC/stream_encoder.h"
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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);
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#define READSIZE 1024
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static unsigned total_samples = 0; /* can use a 32-bit number due to WAVE size limitations */
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static FLAC__byte buffer[READSIZE/*samples*/ * 2/*bytes_per_sample*/ * 2/*channels*/]; /* we read the WAVE data into here */
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static FLAC__int32 pcm[READSIZE/*samples*/ * 2/*channels*/];
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int main(int argc, char *argv[])
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{
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FLAC__bool ok = true;
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FLAC__StreamEncoder *encoder = 0;
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FLAC__StreamEncoderInitStatus init_status;
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FLAC__StreamMetadata *metadata[2];
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FLAC__StreamMetadata_VorbisComment_Entry entry;
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FILE *fin;
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unsigned sample_rate = 0;
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unsigned channels = 0;
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unsigned bps = 0;
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if(argc != 3) {
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fprintf(stderr, "usage: %s infile.wav outfile.flac\n", argv[0]);
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return 1;
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}
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if((fin = fopen(argv[1], "rb")) == NULL) {
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fprintf(stderr, "ERROR: opening %s for output\n", argv[1]);
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return 1;
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}
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/* read wav header and validate it */
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if(
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fread(buffer, 1, 44, fin) != 44 ||
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memcmp(buffer, "RIFF", 4) ||
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memcmp(buffer+8, "WAVEfmt \020\000\000\000\001\000\002\000", 16) ||
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memcmp(buffer+32, "\004\000\020\000data", 8)
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) {
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fprintf(stderr, "ERROR: invalid/unsupported WAVE file, only 16bps stereo WAVE in canonical form allowed\n");
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fclose(fin);
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return 1;
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}
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sample_rate = ((((((unsigned)buffer[27] << 8) | buffer[26]) << 8) | buffer[25]) << 8) | buffer[24];
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channels = 2;
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bps = 16;
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total_samples = (((((((unsigned)buffer[43] << 8) | buffer[42]) << 8) | buffer[41]) << 8) | buffer[40]) / 4;
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/* allocate the encoder */
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if((encoder = FLAC__stream_encoder_new()) == NULL) {
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fprintf(stderr, "ERROR: allocating encoder\n");
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fclose(fin);
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return 1;
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}
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ok &= FLAC__stream_encoder_set_verify(encoder, true);
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ok &= FLAC__stream_encoder_set_compression_level(encoder, 5);
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ok &= FLAC__stream_encoder_set_channels(encoder, channels);
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ok &= FLAC__stream_encoder_set_bits_per_sample(encoder, bps);
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ok &= FLAC__stream_encoder_set_sample_rate(encoder, sample_rate);
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ok &= FLAC__stream_encoder_set_total_samples_estimate(encoder, total_samples);
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/* now add some metadata; we'll add some tags and a padding block */
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if(ok) {
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if(
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(metadata[0] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT)) == NULL ||
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(metadata[1] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)) == NULL ||
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/* there are many tag (vorbiscomment) functions but these are convenient for this particular use: */
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!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "ARTIST", "Some Artist") ||
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!FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, /*copy=*/false) || /* copy=false: let metadata object take control of entry's allocated string */
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!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "YEAR", "1984") ||
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!FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, /*copy=*/false)
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) {
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fprintf(stderr, "ERROR: out of memory or tag error\n");
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ok = false;
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}
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metadata[1]->length = 1234; /* set the padding length */
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ok = FLAC__stream_encoder_set_metadata(encoder, metadata, 2);
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}
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/* initialize encoder */
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if(ok) {
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init_status = FLAC__stream_encoder_init_file(encoder, argv[2], progress_callback, /*client_data=*/NULL);
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if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
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fprintf(stderr, "ERROR: initializing encoder: %s\n", FLAC__StreamEncoderInitStatusString[init_status]);
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ok = false;
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}
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}
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/* read blocks of samples from WAVE file and feed to encoder */
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if(ok) {
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size_t left = (size_t)total_samples;
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while(ok && left) {
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size_t need = (left>READSIZE? (size_t)READSIZE : (size_t)left);
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if(fread(buffer, channels*(bps/8), need, fin) != need) {
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fprintf(stderr, "ERROR: reading from WAVE file\n");
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ok = false;
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}
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else {
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/* convert the packed little-endian 16-bit PCM samples from WAVE into an interleaved FLAC__int32 buffer for libFLAC */
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size_t i;
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for(i = 0; i < need*channels; i++) {
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/* inefficient but simple and works on big- or little-endian machines */
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pcm[i] = (FLAC__int32)(((FLAC__int16)(FLAC__int8)buffer[2*i+1] << 8) | (FLAC__int16)buffer[2*i]);
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}
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/* feed samples to encoder */
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ok = FLAC__stream_encoder_process_interleaved(encoder, pcm, need);
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}
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left -= need;
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}
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}
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ok &= FLAC__stream_encoder_finish(encoder);
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fprintf(stderr, "encoding: %s\n", ok? "succeeded" : "FAILED");
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fprintf(stderr, " state: %s\n", FLAC__StreamEncoderStateString[FLAC__stream_encoder_get_state(encoder)]);
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/* now that encoding is finished, the metadata can be freed */
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FLAC__metadata_object_delete(metadata[0]);
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FLAC__metadata_object_delete(metadata[1]);
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FLAC__stream_encoder_delete(encoder);
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fclose(fin);
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return 0;
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}
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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)
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{
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(void)encoder, (void)client_data;
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fprintf(stderr, "wrote %" PRIu64 " bytes, %" PRIu64 "/%u samples, %u/%u frames\n", bytes_written, samples_written, total_samples, frames_written, total_frames_estimate);
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}
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