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Josh Coalson 2007-09-13 00:33:25 +00:00
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!-- Copyright (c) 2000,2001,2002,2003,2004,2005,2006,2007 Josh Coalson -->
<!-- Permission is granted to copy, distribute and/or modify this document -->
<!-- under the terms of the GNU Free Documentation License, Version 1.1 -->
<!-- or any later version published by the Free Software Foundation; -->
<!-- with no invariant sections. -->
<!-- A copy of the license can be found at http://www.gnu.org/copyleft/fdl.html -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<meta name="author" content="Josh Coalson" />
<meta name="description" content="A free, open source codec for lossless audio compression and decompression" />
<meta name="keywords" content="free,lossless,audio,codec,encoder,decoder,compression,compressor,archival,archive,archiving,backup,music" />
<link rel="shortcut icon" type="image/x-icon" href="favicon.ico" />
<link rel="stylesheet" type="text/css" href="flac.css" />
<title>FLAC - developers</title>
</head>
<body>
<div class="logo">
<a href="http://flac.sourceforge.net/"><img src="images/logo130.gif" alt="FLAC Logo" align="middle" border="0" hspace="0" /></a>
</div>
<div class="above_nav"></div>
<div class="navbar">
&nbsp;<a href="index.html">home</a>&nbsp;&nbsp;|
&nbsp;<a href="faq.html">faq</a>&nbsp;&nbsp;|
&nbsp;<a href="news.html">news</a>&nbsp;&nbsp;|
&nbsp;<a href="download.html">download</a>&nbsp;&nbsp;|
&nbsp;<a href="documentation.html">documentation</a>&nbsp;&nbsp;|
&nbsp;<a href="comparison.html">comparison</a>&nbsp;&nbsp;|
&nbsp;<a href="changelog.html">changelog</a>&nbsp;&nbsp;|
&nbsp;<a href="links.html">links</a>&nbsp;&nbsp;|
&nbsp;<a href="developers.html">developers</a>&nbsp;
</div>
<div class="langbar">
&nbsp;english&nbsp;&nbsp;|
&nbsp;<a href="ru/documentation.html">russian</a>&nbsp;
</div>
<div class="below_nav"></div>
<div class="box">
<div class="box_title">
example code
</div>
<div class="box_header"></div>
<div class="box_body">
The FLAC source code has several small example programs that demonstrate how to use the libraries. The source is available on the <a href="download.html">download page</a>, or can be <a href="http://sourceforge.net/cvs/?group_id=13478">checked out from CVS</a> or <a href="http://flac.cvs.sourceforge.net/flac/flac/examples/">browsed online</a>. The examples complement the <a href="api/index.html">API documentation</a>.<br />
<br />
Currently the examples show how to encode WAV files to FLAC and vice-versa using both libFLAC and libFLAC++. Over time we'll be adding more examples.
</div>
<div class="box_footer"></div>
</div>
<div class="copyright">
<!-- @@@ oh so hacky -->
<table>
<tr>
<td align="left">
Copyright (c) 2007 Josh Coalson
</td>
<td width="1%" align="right">
<a href="http://sourceforge.net"><img src="http://sflogo.sourceforge.net/sflogo.php?group_id=13478&amp;type=1" width="88" height="31" border="0" alt="SourceForge.net Logo" /></a>
</td>
<td width="1%" align="right">
<a href="http://www.eff.org/cafe/"><img src="images/cafebug.gif" alt="CAFE Logo" border="0" /></a><br />
</td>
<td width="1%" align="right">
<a href="http://validator.w3.org/check?uri=referer"><img src="http://www.w3.org/Icons/valid-xhtml10" alt="Valid XHTML 1.0!" height="31" width="88" border="0" hspace="0" /></a>
</td>
</tr>
</table>
</div>
</body>
</html>

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# FLAC - Free Lossless Audio Codec
# Copyright (C) 2001,2002,2003,2004,2005,2006,2007 Josh Coalson
#
# This file is part the FLAC project. FLAC is comprised of several
# components distributed under difference licenses. The codec libraries
# are distributed under Xiph.Org's BSD-like license (see the file
# COPYING.Xiph in this distribution). All other programs, libraries, and
# plugins are distributed under the GPL (see COPYING.GPL). The documentation
# is distributed under the Gnu FDL (see COPYING.FDL). Each file in the
# FLAC distribution contains at the top the terms under which it may be
# distributed.
#
# Since this particular file is relevant to all components of FLAC,
# it may be distributed under the Xiph.Org license, which is the least
# restrictive of those mentioned above. See the file COPYING.Xiph in this
# distribution.
SUBDIRS = file

28
examples/c/encode/file/Makefile.am Normal file
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# example_c_encode_file - Simple FLAC file encoder using libFLAC
# Copyright (C) 2007 Josh Coalson
#
# 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
EXTRA_DIST = \
Makefile.lite \
example_c_encode_file.dsp \
example_c_encode_file.vcproj \
noinst_PROGRAMS = example_c_encode_file
example_c_encode_file_LDADD = \
@OGG_LIBS@ \
@MINGW_WINSOCK_LIBS@ \
-lm
example_c_encode_file_SOURCES = main.c

39
examples/c/encode/file/Makefile.lite Normal file
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# example_c_encode_file - Simple FLAC file encoder using libFLAC
# Copyright (C) 2007 Josh Coalson
#
# 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# GNU makefile
#
topdir = ../../../..
libdir = $(topdir)/obj/$(BUILD)/lib
PROGRAM_NAME = example_c_encode_file
INCLUDES = -I$(topdir)/include
ifeq ($(DARWIN_BUILD),yes)
EXPLICIT_LIBS = $(libdir)/libFLAC.a $(OGG_LIB_DIR)/libogg.a -lm
else
LIBS = -lFLAC -L$(OGG_LIB_DIR) -logg -lm
endif
SRCS_C = main.c
include $(topdir)/build/exe.mk
# DO NOT DELETE THIS LINE -- make depend depends on it.

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examples/c/encode/file/example_c_encode_file.dsp Normal file
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RSC=rc.exe
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# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /Yu"stdafx.h" /FD /c
# ADD CPP /nologo /MD /W3 /GX /O2 /I "..\..\..\..\include" /D "NDEBUG" /D "FLAC__NO_DLL" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /FD /c
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LINK32=link.exe
# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /machine:I386
# ADD LINK32 ..\..\..\..\obj\release\lib\libFLAC_static.lib ..\..\..\..\obj\release\lib\ogg_static.lib /nologo /subsystem:console /machine:I386
!ELSEIF "$(CFG)" == "example_c_encode_file - Win32 Debug"
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# ADD CPP /nologo /MDd /W3 /Gm /GX /ZI /Od /I "..\..\..\..\include" /D "_DEBUG" /D "DEBUG" /D "FLAC__NO_DLL" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /FD /GZ /c
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BSC32=bscmake.exe
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LINK32=link.exe
# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
# ADD LINK32 ..\..\..\..\obj\debug\lib\libFLAC_static.lib ..\..\..\..\obj\release\lib\ogg_static.lib /nologo /subsystem:console /debug /machine:I386 /pdbtype:sept
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examples/c/encode/file/example_c_encode_file.vcproj Normal file
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<?xml version="1.0" encoding="Windows-1252"?>
<VisualStudioProject
ProjectType="Visual C++"
Version="8.00"
Name="example_c_encode_file"
ProjectGUID="{4cefbd01-c215-11db-8314-0800200c9a66}"
RootNamespace="example_c_encode_file"
Keyword="Win32Proj"
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<Platforms>
<Platform
Name="Win32"
/>
</Platforms>
<ToolFiles>
</ToolFiles>
<Configurations>
<Configuration
Name="Debug|Win32"
OutputDirectory="..\..\..\..\obj\debug\bin"
IntermediateDirectory="Debug"
ConfigurationType="1"
>
<Tool
Name="VCPreBuildEventTool"
/>
<Tool
Name="VCCustomBuildTool"
/>
<Tool
Name="VCXMLDataGeneratorTool"
/>
<Tool
Name="VCWebServiceProxyGeneratorTool"
/>
<Tool
Name="VCMIDLTool"
/>
<Tool
Name="VCCLCompilerTool"
Optimization="0"
AdditionalIncludeDirectories="..\..\..\..\include"
PreprocessorDefinitions="WIN32;_DEBUG;_CONSOLE;FLAC__NO_DLL;DEBUG"
MinimalRebuild="true"
BasicRuntimeChecks="3"
RuntimeLibrary="1"
UsePrecompiledHeader="0"
WarningLevel="3"
Detect64BitPortabilityProblems="true"
DebugInformationFormat="4"
CompileAs="0"
DisableSpecificWarnings="4267;4996"
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<Tool
Name="VCManagedResourceCompilerTool"
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Name="VCLinkerTool"
AdditionalDependencies="..\..\..\..\obj\release\lib\ogg_static.lib"
LinkIncremental="2"
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FavorSizeOrSpeed="1"
OmitFramePointers="true"
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AdditionalIncludeDirectories="..\..\..\..\include"
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WarningLevel="3"
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173
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/* example_c_encode_file - Simple FLAC file encoder using libFLAC
* Copyright (C) 2007 Josh Coalson
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
* This example shows how to use libFLAC to encode a WAVE file to a FLAC
* file. It only supports 16-bit stereo files in canonical WAVE format.
*
* Complete API documentation can be found at:
* http://flac.sourceforge.net/api/
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "FLAC/metadata.h"
#include "FLAC/stream_encoder.h"
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);
#define READSIZE 1024
static unsigned total_samples = 0; /* can use a 32-bit number due to WAVE size limitations */
static FLAC__byte buffer[READSIZE/*samples*/ * 2/*bytes_per_sample*/ * 2/*channels*/]; /* we read the WAVE data into here */
static FLAC__int32 pcm[READSIZE/*samples*/ * 2/*channels*/];
int main(int argc, char *argv[])
{
FLAC__bool ok = true;
FLAC__StreamEncoder *encoder = 0;
FLAC__StreamEncoderInitStatus init_status;
FLAC__StreamMetadata *metadata[2];
FLAC__StreamMetadata_VorbisComment_Entry entry;
FILE *fin;
unsigned sample_rate = 0;
unsigned channels = 0;
unsigned bps = 0;
if(argc != 3) {
fprintf(stderr, "usage: %s infile.wav outfile.flac\n", argv[0]);
return 1;
}
if((fin = fopen(argv[1], "rb")) == NULL) {
fprintf(stderr, "ERROR: opening %s for output\n", argv[1]);
return 1;
}
/* read wav header and validate it */
if(
fread(buffer, 1, 44, fin) != 44 ||
memcmp(buffer, "RIFF", 4) ||
memcmp(buffer+8, "WAVEfmt \020\000\000\000\001\000\002\000", 16) ||
memcmp(buffer+32, "\004\000\020\000data", 8)
) {
fprintf(stderr, "ERROR: invalid/unsupported WAVE file, only 16bps stereo WAVE in canonical form allowed\n");
fclose(fin);
return 1;
}
sample_rate = ((((((unsigned)buffer[27] << 8) | buffer[26]) << 8) | buffer[25]) << 8) | buffer[24];
channels = 2;
bps = 16;
total_samples = (((((((unsigned)buffer[43] << 8) | buffer[42]) << 8) | buffer[41]) << 8) | buffer[40]) / 4;
/* allocate the encoder */
if((encoder = FLAC__stream_encoder_new()) == NULL) {
fprintf(stderr, "ERROR: allocating encoder\n");
fclose(fin);
return 1;
}
ok &= FLAC__stream_encoder_set_verify(encoder, true);
ok &= FLAC__stream_encoder_set_compression_level(encoder, 5);
ok &= FLAC__stream_encoder_set_channels(encoder, channels);
ok &= FLAC__stream_encoder_set_bits_per_sample(encoder, bps);
ok &= FLAC__stream_encoder_set_sample_rate(encoder, sample_rate);
ok &= FLAC__stream_encoder_set_total_samples_estimate(encoder, total_samples);
/* now add some metadata; we'll add some tags and a padding block */
if(ok) {
if(
(metadata[0] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT)) == NULL ||
(metadata[1] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)) == NULL ||
/* there are many tag (vorbiscomment) functions but these are convenient for this particular use: */
!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "ARTIST", "Some Artist") ||
!FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, /*copy=*/false) || /* copy=false: let metadata object take control of entry's allocated string */
!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "YEAR", "1984") ||
!FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, /*copy=*/false)
) {
fprintf(stderr, "ERROR: out of memory or tag error\n");
ok = false;
}
metadata[1]->length = 1234; /* set the padding length */
ok = FLAC__stream_encoder_set_metadata(encoder, metadata, 2);
}
/* initialize encoder */
if(ok) {
init_status = FLAC__stream_encoder_init_file(encoder, argv[2], progress_callback, /*client_data=*/NULL);
if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
fprintf(stderr, "ERROR: initializing encoder: %s\n", FLAC__StreamEncoderInitStatusString[init_status]);
ok = false;
}
}
/* read blocks of samples from WAVE file and feed to encoder */
if(ok) {
size_t left = (size_t)total_samples;
while(ok && left) {
size_t need = (left>READSIZE? (size_t)READSIZE : (size_t)left);
if(fread(buffer, channels*(bps/8), need, fin) != need) {
fprintf(stderr, "ERROR: reading from WAVE file\n");
ok = false;
}
else {
/* convert the packed little-endian 16-bit PCM samples from WAVE into an interleaved FLAC__int32 buffer for libFLAC */
size_t i;
for(i = 0; i < need*channels; i++) {
/* inefficient but simple and works on big- or little-endian machines */
pcm[i] = (FLAC__int32)(((FLAC__int16)(FLAC__int8)buffer[2*i+1] << 8) | (FLAC__int16)buffer[2*i]);
}
/* feed samples to encoder */
ok = FLAC__stream_encoder_process_interleaved(encoder, pcm, need);
}
left -= need;
}
}
ok &= FLAC__stream_encoder_finish(encoder);
fprintf(stderr, "encoding: %s\n", ok? "succeeded" : "FAILED");
fprintf(stderr, " state: %s\n", FLAC__StreamEncoderStateString[FLAC__stream_encoder_get_state(encoder)]);
/* now that encoding is finished, the metadata can be freed */
FLAC__metadata_object_delete(metadata[0]);
FLAC__metadata_object_delete(metadata[1]);
FLAC__stream_encoder_delete(encoder);
fclose(fin);
return 0;
}
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)
{
(void)encoder, (void)client_data;
#ifdef _MSC_VER
fprintf(stderr, "wrote %I64u bytes, %I64u/%u samples, %u/%u frames\n", bytes_written, samples_written, total_samples, frames_written, total_frames_estimate);
#else
fprintf(stderr, "wrote %llu bytes, %llu/%u samples, %u/%u frames\n", bytes_written, samples_written, total_samples, frames_written, total_frames_estimate);
#endif
}

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examples/cpp/encode/Makefile.am Normal file
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# FLAC - Free Lossless Audio Codec
# Copyright (C) 2001,2002,2003,2004,2005,2006,2007 Josh Coalson
#
# This file is part the FLAC project. FLAC is comprised of several
# components distributed under difference licenses. The codec libraries
# are distributed under Xiph.Org's BSD-like license (see the file
# COPYING.Xiph in this distribution). All other programs, libraries, and
# plugins are distributed under the GPL (see COPYING.GPL). The documentation
# is distributed under the Gnu FDL (see COPYING.FDL). Each file in the
# FLAC distribution contains at the top the terms under which it may be
# distributed.
#
# Since this particular file is relevant to all components of FLAC,
# it may be distributed under the Xiph.Org license, which is the least
# restrictive of those mentioned above. See the file COPYING.Xiph in this
# distribution.
SUBDIRS = file

28
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# example_cpp_encode_file - Simple FLAC file encoder using libFLAC
# Copyright (C) 2007 Josh Coalson
#
# 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
EXTRA_DIST = \
Makefile.lite \
example_cpp_encode_file.dsp \
example_cpp_encode_file.vcproj \
noinst_PROGRAMS = example_cpp_encode_file
example_cpp_encode_file_LDADD = \
@OGG_LIBS@ \
@MINGW_WINSOCK_LIBS@ \
-lm
example_cpp_encode_file_SOURCES = main.c

41
examples/cpp/encode/file/Makefile.lite Normal file
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# example_cpp_encode_file - Simple FLAC file encoder using libFLAC
# Copyright (C) 2007 Josh Coalson
#
# 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# GNU makefile
#
topdir = ../../../..
libdir = $(topdir)/obj/$(BUILD)/lib
PROGRAM_NAME = example_cpp_encode_file
INCLUDES = -I$(topdir)/include
ifeq ($(DARWIN_BUILD),yes)
EXPLICIT_LIBS = $(libdir)/libFLAC++.a $(libdir)/libFLAC.a $(OGG_LIB_DIR)/libogg.a -lm
else
LIBS = -lFLAC++ -lFLAC -L$(OGG_LIB_DIR) -logg -lm
endif
SRCS_CPP = main.cpp
include $(topdir)/build/exe.mk
LINK = $(CCC) $(LINKAGE)
# DO NOT DELETE THIS LINE -- make depend depends on it.

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# ADD BASE CPP /nologo /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_CONSOLE" /D "_MBCS" /Yu"stdafx.h" /FD /c
# ADD CPP /nologo /MD /W3 /GX /O2 /I "..\..\..\..\include" /D "NDEBUG" /D "FLAC__NO_DLL" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /FD /c
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Name="Win32"
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</Platforms>
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<Configuration
Name="Debug|Win32"
OutputDirectory="..\..\..\..\obj\debug\bin"
IntermediateDirectory="Debug"
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<Tool
Name="VCCLCompilerTool"
Optimization="0"
AdditionalIncludeDirectories="..\..\..\..\include"
PreprocessorDefinitions="WIN32;_DEBUG;_CONSOLE;FLAC__NO_DLL;DEBUG"
MinimalRebuild="true"
BasicRuntimeChecks="3"
RuntimeLibrary="1"
UsePrecompiledHeader="0"
WarningLevel="3"
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175
examples/cpp/encode/file/main.cpp Normal file
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/* example_cpp_encode_file - Simple FLAC file encoder using libFLAC
* Copyright (C) 2007 Josh Coalson
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
* This example shows how to use libFLAC++ to encode a WAVE file to a FLAC
* file. It only supports 16-bit stereo files in canonical WAVE format.
*
* Complete API documentation can be found at:
* http://flac.sourceforge.net/api/
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include "FLAC++/metadata.h"
#include "FLAC++/encoder.h"
class OurEncoder: public FLAC::Encoder::File {
public:
OurEncoder(): FLAC::Encoder::File() { }
protected:
virtual void progress_callback(FLAC__uint64 bytes_written, FLAC__uint64 samples_written, unsigned frames_written, unsigned total_frames_estimate);
};
#define READSIZE 1024
static unsigned total_samples = 0; /* can use a 32-bit number due to WAVE size limitations */
static FLAC__byte buffer[READSIZE/*samples*/ * 2/*bytes_per_sample*/ * 2/*channels*/]; /* we read the WAVE data into here */
static FLAC__int32 pcm[READSIZE/*samples*/ * 2/*channels*/];
static FLAC__int32 *pcm_[2] = { pcm, pcm+READSIZE };
int main(int argc, char *argv[])
{
FLAC__bool ok = true;
OurEncoder encoder;
FLAC__StreamEncoderInitStatus init_status;
FLAC__StreamMetadata *metadata[2];
FLAC__StreamMetadata_VorbisComment_Entry entry;
FILE *fin;
unsigned sample_rate = 0;
unsigned channels = 0;
unsigned bps = 0;
if(argc != 3) {
fprintf(stderr, "usage: %s infile.wav outfile.flac\n", argv[0]);
return 1;
}
if((fin = fopen(argv[1], "rb")) == NULL) {
fprintf(stderr, "ERROR: opening %s for output\n", argv[1]);
return 1;
}
/* read wav header and validate it */
if(
fread(buffer, 1, 44, fin) != 44 ||
memcmp(buffer, "RIFF", 4) ||
memcmp(buffer+8, "WAVEfmt \020\000\000\000\001\000\002\000", 16) ||
memcmp(buffer+32, "\004\000\020\000data", 8)
) {
fprintf(stderr, "ERROR: invalid/unsupported WAVE file, only 16bps stereo WAVE in canonical form allowed\n");
fclose(fin);
return 1;
}
sample_rate = ((((((unsigned)buffer[27] << 8) | buffer[26]) << 8) | buffer[25]) << 8) | buffer[24];
channels = 2;
bps = 16;
total_samples = (((((((unsigned)buffer[43] << 8) | buffer[42]) << 8) | buffer[41]) << 8) | buffer[40]) / 4;
/* check the encoder */
if(!encoder) {
fprintf(stderr, "ERROR: allocating encoder\n");
fclose(fin);
return 1;
}
ok &= encoder.set_verify(true);
ok &= encoder.set_compression_level(5);
ok &= encoder.set_channels(channels);
ok &= encoder.set_bits_per_sample(bps);
ok &= encoder.set_sample_rate(sample_rate);
ok &= encoder.set_total_samples_estimate(total_samples);
/* now add some metadata; we'll add some tags and a padding block */
if(ok) {
if(
(metadata[0] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT)) == NULL ||
(metadata[1] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)) == NULL ||
/* there are many tag (vorbiscomment) functions but these are convenient for this particular use: */
!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "ARTIST", "Some Artist") ||
!FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, /*copy=*/false) || /* copy=false: let metadata object take control of entry's allocated string */
!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "YEAR", "1984") ||
!FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, /*copy=*/false)
) {
fprintf(stderr, "ERROR: out of memory or tag error\n");
ok = false;
}
metadata[1]->length = 1234; /* set the padding length */
ok = encoder.set_metadata(metadata, 2);
}
/* initialize encoder */
if(ok) {
init_status = encoder.init(argv[2]);
if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
fprintf(stderr, "ERROR: initializing encoder: %s\n", FLAC__StreamEncoderInitStatusString[init_status]);
ok = false;
}
}
/* read blocks of samples from WAVE file and feed to encoder */
if(ok) {
size_t left = (size_t)total_samples;
while(ok && left) {
size_t need = (left>READSIZE? (size_t)READSIZE : (size_t)left);
if(fread(buffer, channels*(bps/8), need, fin) != need) {
fprintf(stderr, "ERROR: reading from WAVE file\n");
ok = false;
}
else {
/* convert the packed little-endian 16-bit PCM samples from WAVE into an interleaved FLAC__int32 buffer for libFLAC */
size_t i;
for(i = 0; i < need*channels; i++) {
/* inefficient but simple and works on big- or little-endian machines */
pcm[i] = (FLAC__int32)(((FLAC__int16)(FLAC__int8)buffer[2*i+1] << 8) | (FLAC__int16)buffer[2*i]);
}
/* feed samples to encoder */
ok = encoder.process_interleaved(pcm, need);
}
left -= need;
}
}
ok &= encoder.finish();
fprintf(stderr, "encoding: %s\n", ok? "succeeded" : "FAILED");
fprintf(stderr, " state: %s\n", encoder.get_state().resolved_as_cstring(encoder));
/* now that encoding is finished, the metadata can be freed */
FLAC__metadata_object_delete(metadata[0]);
FLAC__metadata_object_delete(metadata[1]);
fclose(fin);
return 0;
}
void OurEncoder::progress_callback(FLAC__uint64 bytes_written, FLAC__uint64 samples_written, unsigned frames_written, unsigned total_frames_estimate)
{
#ifdef _MSC_VER
fprintf(stderr, "wrote %I64u bytes, %I64u/%u samples, %u/%u frames\n", bytes_written, samples_written, total_samples, frames_written, total_frames_estimate);
#else
fprintf(stderr, "wrote %llu bytes, %llu/%u samples, %u/%u frames\n", bytes_written, samples_written, total_samples, frames_written, total_frames_estimate);
#endif
}