| /* example_c_decode_file - Simple FLAC file decoder using libFLAC |
| * Copyright (C) 2007-2009 Josh Coalson |
| * Copyright (C) 2011-2016 Xiph.Org Foundation |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * of the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| |
| /* |
| * This example shows how to use libFLAC to decode a FLAC file to a WAVE |
| * file. It only supports 16-bit stereo files. |
| * |
| * Complete API documentation can be found at: |
| * http://xiph.org/flac/api/ |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include <config.h> |
| #endif |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include "share/compat.h" |
| #include "FLAC/stream_decoder.h" |
| |
| static FLAC__StreamDecoderWriteStatus write_callback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data); |
| static void metadata_callback(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data); |
| static void error_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data); |
| |
| static FLAC__uint64 total_samples = 0; |
| static unsigned sample_rate = 0; |
| static unsigned channels = 0; |
| static unsigned bps = 0; |
| |
| static FLAC__bool write_little_endian_uint16(FILE *f, FLAC__uint16 x) |
| { |
| return |
| fputc(x, f) != EOF && |
| fputc(x >> 8, f) != EOF |
| ; |
| } |
| |
| static FLAC__bool write_little_endian_int16(FILE *f, FLAC__int16 x) |
| { |
| return write_little_endian_uint16(f, (FLAC__uint16)x); |
| } |
| |
| static FLAC__bool write_little_endian_uint32(FILE *f, FLAC__uint32 x) |
| { |
| return |
| fputc(x, f) != EOF && |
| fputc(x >> 8, f) != EOF && |
| fputc(x >> 16, f) != EOF && |
| fputc(x >> 24, f) != EOF |
| ; |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| FLAC__bool ok = true; |
| FLAC__StreamDecoder *decoder = 0; |
| FLAC__StreamDecoderInitStatus init_status; |
| FILE *fout; |
| |
| if(argc != 3) { |
| fprintf(stderr, "usage: %s infile.flac outfile.wav\n", argv[0]); |
| return 1; |
| } |
| |
| if((fout = fopen(argv[2], "wb")) == NULL) { |
| fprintf(stderr, "ERROR: opening %s for output\n", argv[2]); |
| return 1; |
| } |
| |
| if((decoder = FLAC__stream_decoder_new()) == NULL) { |
| fprintf(stderr, "ERROR: allocating decoder\n"); |
| fclose(fout); |
| return 1; |
| } |
| |
| (void)FLAC__stream_decoder_set_md5_checking(decoder, true); |
| |
| init_status = FLAC__stream_decoder_init_file(decoder, argv[1], write_callback, metadata_callback, error_callback, /*client_data=*/fout); |
| if(init_status != FLAC__STREAM_DECODER_INIT_STATUS_OK) { |
| fprintf(stderr, "ERROR: initializing decoder: %s\n", FLAC__StreamDecoderInitStatusString[init_status]); |
| ok = false; |
| } |
| |
| if(ok) { |
| ok = FLAC__stream_decoder_process_until_end_of_stream(decoder); |
| fprintf(stderr, "decoding: %s\n", ok? "succeeded" : "FAILED"); |
| fprintf(stderr, " state: %s\n", FLAC__StreamDecoderStateString[FLAC__stream_decoder_get_state(decoder)]); |
| } |
| |
| FLAC__stream_decoder_delete(decoder); |
| fclose(fout); |
| |
| return 0; |
| } |
| |
| FLAC__StreamDecoderWriteStatus write_callback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data) |
| { |
| FILE *f = (FILE*)client_data; |
| const FLAC__uint32 total_size = (FLAC__uint32)(total_samples * channels * (bps/8)); |
| size_t i; |
| |
| (void)decoder; |
| |
| if(total_samples == 0) { |
| fprintf(stderr, "ERROR: this example only works for FLAC files that have a total_samples count in STREAMINFO\n"); |
| return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; |
| } |
| if(channels != 2 || bps != 16) { |
| fprintf(stderr, "ERROR: this example only supports 16bit stereo streams\n"); |
| return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; |
| } |
| if(frame->header.channels != 2) { |
| fprintf(stderr, "ERROR: This frame contains %u channels (should be 2)\n", frame->header.channels); |
| return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; |
| } |
| if(buffer [0] == NULL) { |
| fprintf(stderr, "ERROR: buffer [0] is NULL\n"); |
| return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; |
| } |
| if(buffer [1] == NULL) { |
| fprintf(stderr, "ERROR: buffer [1] is NULL\n"); |
| return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; |
| } |
| |
| /* write WAVE header before we write the first frame */ |
| if(frame->header.number.sample_number == 0) { |
| if( |
| fwrite("RIFF", 1, 4, f) < 4 || |
| !write_little_endian_uint32(f, total_size + 36) || |
| fwrite("WAVEfmt ", 1, 8, f) < 8 || |
| !write_little_endian_uint32(f, 16) || |
| !write_little_endian_uint16(f, 1) || |
| !write_little_endian_uint16(f, (FLAC__uint16)channels) || |
| !write_little_endian_uint32(f, sample_rate) || |
| !write_little_endian_uint32(f, sample_rate * channels * (bps/8)) || |
| !write_little_endian_uint16(f, (FLAC__uint16)(channels * (bps/8))) || /* block align */ |
| !write_little_endian_uint16(f, (FLAC__uint16)bps) || |
| fwrite("data", 1, 4, f) < 4 || |
| !write_little_endian_uint32(f, total_size) |
| ) { |
| fprintf(stderr, "ERROR: write error\n"); |
| return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; |
| } |
| } |
| |
| /* write decoded PCM samples */ |
| for(i = 0; i < frame->header.blocksize; i++) { |
| if( |
| !write_little_endian_int16(f, (FLAC__int16)buffer[0][i]) || /* left channel */ |
| !write_little_endian_int16(f, (FLAC__int16)buffer[1][i]) /* right channel */ |
| ) { |
| fprintf(stderr, "ERROR: write error\n"); |
| return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; |
| } |
| } |
| |
| return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; |
| } |
| |
| void metadata_callback(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data) |
| { |
| (void)decoder, (void)client_data; |
| |
| /* print some stats */ |
| if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) { |
| /* save for later */ |
| total_samples = metadata->data.stream_info.total_samples; |
| sample_rate = metadata->data.stream_info.sample_rate; |
| channels = metadata->data.stream_info.channels; |
| bps = metadata->data.stream_info.bits_per_sample; |
| |
| fprintf(stderr, "sample rate : %u Hz\n", sample_rate); |
| fprintf(stderr, "channels : %u\n", channels); |
| fprintf(stderr, "bits per sample: %u\n", bps); |
| fprintf(stderr, "total samples : %" PRIu64 "\n", total_samples); |
| } |
| } |
| |
| void error_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) |
| { |
| (void)decoder, (void)client_data; |
| |
| fprintf(stderr, "Got error callback: %s\n", FLAC__StreamDecoderErrorStatusString[status]); |
| } |