/*
* Copyright (C) 2003-2014 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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.
*/
#include "config.h"
#include "SndfileDecoderPlugin.hxx"
#include "../DecoderAPI.hxx"
#include "input/InputStream.hxx"
#include "CheckAudioFormat.hxx"
#include "tag/TagHandler.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"
#include <sndfile.h>
static constexpr Domain sndfile_domain("sndfile");
static sf_count_t
sndfile_vio_get_filelen(void *user_data)
{
const InputStream &is = *(const InputStream *)user_data;
return is.GetSize();
}
static sf_count_t
sndfile_vio_seek(sf_count_t offset, int whence, void *user_data)
{
InputStream &is = *(InputStream *)user_data;
if (!is.LockSeek(offset, whence, IgnoreError()))
return -1;
return is.GetOffset();
}
static sf_count_t
sndfile_vio_read(void *ptr, sf_count_t count, void *user_data)
{
InputStream &is = *(InputStream *)user_data;
Error error;
size_t nbytes = is.LockRead(ptr, count, error);
if (nbytes == 0 && error.IsDefined()) {
LogError(error);
return -1;
}
return nbytes;
}
static sf_count_t
sndfile_vio_write(gcc_unused const void *ptr,
gcc_unused sf_count_t count,
gcc_unused void *user_data)
{
/* no writing! */
return -1;
}
static sf_count_t
sndfile_vio_tell(void *user_data)
{
const InputStream &is = *(const InputStream *)user_data;
return is.GetOffset();
}
/**
* This SF_VIRTUAL_IO implementation wraps MPD's #input_stream to a
* libsndfile stream.
*/
static SF_VIRTUAL_IO vio = {
sndfile_vio_get_filelen,
sndfile_vio_seek,
sndfile_vio_read,
sndfile_vio_write,
sndfile_vio_tell,
};
/**
* Converts a frame number to a timestamp (in seconds).
*/
static float
frame_to_time(sf_count_t frame, const AudioFormat *audio_format)
{
return (float)frame / (float)audio_format->sample_rate;
}
/**
* Converts a timestamp (in seconds) to a frame number.
*/
static sf_count_t
time_to_frame(float t, const AudioFormat *audio_format)
{
return (sf_count_t)(t * audio_format->sample_rate);
}
static void
sndfile_stream_decode(Decoder &decoder, InputStream &is)
{
SNDFILE *sf;
SF_INFO info;
size_t frame_size;
sf_count_t read_frames, num_frames;
int buffer[4096];
info.format = 0;
sf = sf_open_virtual(&vio, SFM_READ, &info, &is);
if (sf == nullptr) {
LogWarning(sndfile_domain, "sf_open_virtual() failed");
return;
}
/* for now, always read 32 bit samples. Later, we could lower
MPD's CPU usage by reading 16 bit samples with
sf_readf_short() on low-quality source files. */
Error error;
AudioFormat audio_format;
if (!audio_format_init_checked(audio_format, info.samplerate,
SampleFormat::S32,
info.channels, error)) {
LogError(error);
return;
}
decoder_initialized(decoder, audio_format, info.seekable,
frame_to_time(info.frames, &audio_format));
frame_size = audio_format.GetFrameSize();
read_frames = sizeof(buffer) / frame_size;
DecoderCommand cmd;
do {
num_frames = sf_readf_int(sf, buffer, read_frames);
if (num_frames <= 0)
break;
cmd = decoder_data(decoder, is,
buffer, num_frames * frame_size,
0);
if (cmd == DecoderCommand::SEEK) {
sf_count_t c =
time_to_frame(decoder_seek_where(decoder),
&audio_format);
c = sf_seek(sf, c, SEEK_SET);
if (c < 0)
decoder_seek_error(decoder);
else
decoder_command_finished(decoder);
cmd = DecoderCommand::NONE;
}
} while (cmd == DecoderCommand::NONE);
sf_close(sf);
}
static bool
sndfile_scan_file(const char *path_fs,
const struct tag_handler *handler, void *handler_ctx)
{
SNDFILE *sf;
SF_INFO info;
const char *p;
info.format = 0;
sf = sf_open(path_fs, SFM_READ, &info);
if (sf == nullptr)
return false;
if (!audio_valid_sample_rate(info.samplerate)) {
sf_close(sf);
FormatWarning(sndfile_domain,
"Invalid sample rate in %s", path_fs);
return false;
}
tag_handler_invoke_duration(handler, handler_ctx,
info.frames / info.samplerate);
p = sf_get_string(sf, SF_STR_TITLE);
if (p != nullptr)
tag_handler_invoke_tag(handler, handler_ctx,
TAG_TITLE, p);
p = sf_get_string(sf, SF_STR_ARTIST);
if (p != nullptr)
tag_handler_invoke_tag(handler, handler_ctx,
TAG_ARTIST, p);
p = sf_get_string(sf, SF_STR_DATE);
if (p != nullptr)
tag_handler_invoke_tag(handler, handler_ctx,
TAG_DATE, p);
sf_close(sf);
return true;
}
static const char *const sndfile_suffixes[] = {
"wav", "aiff", "aif", /* Microsoft / SGI / Apple */
"au", "snd", /* Sun / DEC / NeXT */
"paf", /* Paris Audio File */
"iff", "svx", /* Commodore Amiga IFF / SVX */
"sf", /* IRCAM */
"voc", /* Creative */
"w64", /* Soundforge */
"pvf", /* Portable Voice Format */
"xi", /* Fasttracker */
"htk", /* HMM Tool Kit */
"caf", /* Apple */
"sd2", /* Sound Designer II */
/* libsndfile also supports FLAC and Ogg Vorbis, but only by
linking with libFLAC and libvorbis - we can do better, we
have native plugins for these libraries */
nullptr
};
static const char *const sndfile_mime_types[] = {
"audio/x-wav",
"audio/x-aiff",
/* what are the MIME types of the other supported formats? */
nullptr
};
const struct DecoderPlugin sndfile_decoder_plugin = {
"sndfile",
nullptr,
nullptr,
sndfile_stream_decode,
nullptr,
sndfile_scan_file,
nullptr,
nullptr,
sndfile_suffixes,
sndfile_mime_types,
};
