112 lines
2.8 KiB
C++
112 lines
2.8 KiB
C++
/*
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* Copyright 2003-2016 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "PcmDecoderPlugin.hxx"
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#include "../DecoderAPI.hxx"
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#include "input/InputStream.hxx"
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#include "util/Error.hxx"
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#include "util/ByteReverse.hxx"
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#include "Log.hxx"
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#include <string.h>
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static void
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pcm_stream_decode(Decoder &decoder, InputStream &is)
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{
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static constexpr AudioFormat audio_format = {
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44100,
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SampleFormat::S16,
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2,
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};
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const char *const mime = is.GetMimeType();
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const bool reverse_endian = mime != nullptr &&
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strcmp(mime, "audio/x-mpd-cdda-pcm-reverse") == 0;
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const auto frame_size = audio_format.GetFrameSize();
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const auto total_time = is.KnownSize()
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? SignedSongTime::FromScale<uint64_t>(is.GetSize() / frame_size,
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audio_format.sample_rate)
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: SignedSongTime::Negative();
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decoder_initialized(decoder, audio_format,
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is.IsSeekable(), total_time);
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DecoderCommand cmd;
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do {
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char buffer[4096];
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size_t nbytes = decoder_read(decoder, is,
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buffer, sizeof(buffer));
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if (nbytes == 0 && is.LockIsEOF())
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break;
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if (reverse_endian)
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/* make sure we deliver samples in host byte order */
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reverse_bytes_16((uint16_t *)buffer,
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(uint16_t *)buffer,
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(uint16_t *)(buffer + nbytes));
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cmd = nbytes > 0
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? decoder_data(decoder, is,
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buffer, nbytes, 0)
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: decoder_get_command(decoder);
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if (cmd == DecoderCommand::SEEK) {
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uint64_t frame = decoder_seek_where_frame(decoder);
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offset_type offset = frame * frame_size;
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Error error;
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if (is.LockSeek(offset, error)) {
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decoder_command_finished(decoder);
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} else {
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LogError(error);
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decoder_seek_error(decoder);
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}
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cmd = DecoderCommand::NONE;
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}
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} while (cmd == DecoderCommand::NONE);
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}
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static const char *const pcm_mime_types[] = {
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/* for streams obtained by the cdio_paranoia input plugin */
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"audio/x-mpd-cdda-pcm",
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/* same as above, but with reverse byte order */
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"audio/x-mpd-cdda-pcm-reverse",
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nullptr
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};
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const struct DecoderPlugin pcm_decoder_plugin = {
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"pcm",
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nullptr,
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nullptr,
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pcm_stream_decode,
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nullptr,
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nullptr,
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nullptr,
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nullptr,
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nullptr,
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pcm_mime_types,
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};
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