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/*
* Copyright (C) 2003-2013 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 "decoder/PcmDecoderPlugin.hxx"
#include "DecoderAPI.hxx"
#include "InputStream.hxx"
#include "util/Error.hxx"
#include "Log.hxx"
extern "C" {
#include "util/byte_reverse.h"
}
#include <glib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h> /* for SEEK_SET */
static void
pcm_stream_decode(struct decoder *decoder, struct input_stream *is)
{
static constexpr AudioFormat audio_format = {
44100,
SampleFormat::S16,
2,
};
const char *const mime = is->GetMimeType();
const bool reverse_endian = mime != nullptr &&
strcmp(mime, "audio/x-mpd-cdda-pcm-reverse") == 0;
const double time_to_size = audio_format.GetTimeToSize();
float total_time = -1;
const goffset size = is->GetSize();
if (size >= 0)
total_time = size / time_to_size;
decoder_initialized(decoder, audio_format,
is->IsSeekable(), total_time);
DecoderCommand cmd;
do {
char buffer[4096];
size_t nbytes = decoder_read(decoder, is,
buffer, sizeof(buffer));
if (nbytes == 0 && is->LockIsEOF())
break;
if (reverse_endian)
/* make sure we deliver samples in host byte order */
reverse_bytes_16((uint16_t *)buffer,
(uint16_t *)buffer,
(uint16_t *)(buffer + nbytes));
cmd = nbytes > 0
? decoder_data(decoder, is,
buffer, nbytes, 0)
: decoder_get_command(decoder);
if (cmd == DecoderCommand::SEEK) {
goffset offset = (goffset)(time_to_size *
decoder_seek_where(decoder));
Error error;
if (is->LockSeek(offset, SEEK_SET, error)) {
decoder_command_finished(decoder);
} else {
LogError(error);
decoder_seek_error(decoder);
}
cmd = DecoderCommand::NONE;
}
} while (cmd == DecoderCommand::NONE);
}
static const char *const pcm_mime_types[] = {
/* for streams obtained by the cdio_paranoia input plugin */
"audio/x-mpd-cdda-pcm",
/* same as above, but with reverse byte order */
"audio/x-mpd-cdda-pcm-reverse",
nullptr
};
const struct decoder_plugin pcm_decoder_plugin = {
"pcm",
nullptr,
nullptr,
pcm_stream_decode,
nullptr,
nullptr,
nullptr,
nullptr,
nullptr,
pcm_mime_types,
};
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