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/*
* 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 "PcmDecoderPlugin.hxx"
#include "../DecoderAPI.hxx"
#include "input/InputStream.hxx"
#include "util/Error.hxx"
#include "util/ByteReverse.hxx"
#include "Log.hxx"
#include <string.h>
static void
pcm_stream_decode(Decoder &decoder, InputStream &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 auto frame_size = audio_format.GetFrameSize();
const auto total_time = is.KnownSize()
? SignedSongTime::FromScale<uint64_t>(is.GetSize() / frame_size,
audio_format.sample_rate)
: SignedSongTime::Negative();
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) {
uint64_t frame = decoder_seek_where_frame(decoder);
offset_type offset = frame * frame_size;
Error error;
if (is.LockSeek(offset, 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 DecoderPlugin pcm_decoder_plugin = {
"pcm",
nullptr,
nullptr,
pcm_stream_decode,
nullptr,
nullptr,
nullptr,
nullptr,
nullptr,
pcm_mime_types,
};
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