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/*
* Copyright 2003-2018 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 "PcmDecoderPlugin.hxx"
#include "../DecoderAPI.hxx"
#include "CheckAudioFormat.hxx"
#include "pcm/PcmPack.hxx"
#include "input/InputStream.hxx"
#include "system/ByteOrder.hxx"
#include "util/Domain.hxx"
#include "util/ByteReverse.hxx"
#include "util/StaticFifoBuffer.hxx"
#include "util/NumberParser.hxx"
#include "util/MimeType.hxx"
#include "Log.hxx"
#include <exception>
#include <assert.h>
#include <string.h>
static constexpr Domain pcm_decoder_domain("pcm_decoder");
template<typename B>
static bool
FillBuffer(DecoderClient &client, InputStream &is, B &buffer)
{
buffer.Shift();
auto w = buffer.Write();
if (w.empty())
return true;
size_t nbytes = decoder_read(client, is, w.data, w.size);
if (nbytes == 0 && is.LockIsEOF())
return false;
buffer.Append(nbytes);
return true;
}
static void
pcm_stream_decode(DecoderClient &client, InputStream &is)
{
AudioFormat audio_format = {
44100,
SampleFormat::S16,
2,
};
const char *const mime = is.GetMimeType();
const bool l16 = mime != nullptr &&
GetMimeTypeBase(mime) == "audio/L16";
const bool l24 = mime != nullptr &&
GetMimeTypeBase(mime) == "audio/L24";
const bool is_float = mime != nullptr &&
GetMimeTypeBase(mime) == "audio/x-mpd-float";
if (l16 || l24 || is_float) {
audio_format.sample_rate = 0;
audio_format.channels = 1;
}
if (l24)
audio_format.format = SampleFormat::S24_P32;
const bool reverse_endian = (l16 && IsLittleEndian()) ||
(mime != nullptr &&
strcmp(mime, "audio/x-mpd-cdda-pcm-reverse") == 0);
if (is_float)
audio_format.format = SampleFormat::FLOAT;
if (mime != nullptr) {
const auto mime_parameters = ParseMimeTypeParameters(mime);
/* MIME type parameters according to RFC 2586 */
auto i = mime_parameters.find("rate");
if (i != mime_parameters.end()) {
const char *s = i->second.c_str();
char *endptr;
unsigned value = ParseUnsigned(s, &endptr);
if (endptr == s || *endptr != 0) {
FormatWarning(pcm_decoder_domain,
"Failed to parse sample rate: %s",
s);
return;
}
try {
CheckSampleRate(value);
} catch (...) {
LogError(std::current_exception());
return;
}
audio_format.sample_rate = value;
}
i = mime_parameters.find("channels");
if (i != mime_parameters.end()) {
const char *s = i->second.c_str();
char *endptr;
unsigned value = ParseUnsigned(s, &endptr);
if (endptr == s || *endptr != 0) {
FormatWarning(pcm_decoder_domain,
"Failed to parse sample rate: %s",
s);
return;
}
try {
CheckChannelCount(value);
} catch (...) {
LogError(std::current_exception());
return;
}
audio_format.channels = value;
}
}
if (audio_format.sample_rate == 0) {
FormatWarning(pcm_decoder_domain,
"Missing 'rate' parameter: %s",
mime);
return;
}
const auto out_frame_size = audio_format.GetFrameSize();
const auto in_frame_size = out_frame_size;
const auto total_time = is.KnownSize()
? SignedSongTime::FromScale<uint64_t>(is.GetSize() / in_frame_size,
audio_format.sample_rate)
: SignedSongTime::Negative();
client.Ready(audio_format, is.IsSeekable(), total_time);
StaticFifoBuffer<uint8_t, 4096> buffer;
/* a buffer for pcm_unpack_24be() large enough to hold the
results for a full source buffer */
int32_t unpack_buffer[buffer.GetCapacity() / 3];
DecoderCommand cmd;
do {
if (!FillBuffer(client, is, buffer))
break;
auto r = buffer.Read();
/* round down to the nearest frame size, because we
must not pass partial frames to
DecoderClient::SubmitData() */
r.size -= r.size % in_frame_size;
buffer.Consume(r.size);
if (reverse_endian)
/* make sure we deliver samples in host byte order */
reverse_bytes_16((uint16_t *)r.data,
(uint16_t *)r.data,
(uint16_t *)(r.data + r.size));
else if (l24) {
/* convert big-endian packed 24 bit
(audio/L24) to native-endian 24 bit (in 32
bit integers) */
pcm_unpack_24be(unpack_buffer, r.begin(), r.end());
r.data = (uint8_t *)&unpack_buffer[0];
r.size = (r.size / 3) * 4;
}
cmd = !r.empty()
? client.SubmitData(is, r.data, r.size, 0)
: client.GetCommand();
if (cmd == DecoderCommand::SEEK) {
uint64_t frame = client.GetSeekFrame();
offset_type offset = frame * in_frame_size;
try {
is.LockSeek(offset);
buffer.Clear();
client.CommandFinished();
} catch (...) {
LogError(std::current_exception());
client.SeekError();
}
cmd = DecoderCommand::NONE;
}
} while (cmd == DecoderCommand::NONE);
}
static const char *const pcm_mime_types[] = {
/* RFC 2586 */
"audio/L16",
/* RFC 3190 */
"audio/L24",
/* MPD-specific: float32 native-endian */
"audio/x-mpd-float",
/* 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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