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Diffstat (limited to '')
| -rw-r--r-- | src/decoder/plugins/MpcdecDecoderPlugin.cxx | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/src/decoder/plugins/MpcdecDecoderPlugin.cxx b/src/decoder/plugins/MpcdecDecoderPlugin.cxx new file mode 100644 index 000000000..befed0f3b --- /dev/null +++ b/src/decoder/plugins/MpcdecDecoderPlugin.cxx @@ -0,0 +1,280 @@ +/* + * 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 "MpcdecDecoderPlugin.hxx" +#include "../DecoderAPI.hxx" +#include "input/InputStream.hxx" +#include "CheckAudioFormat.hxx" +#include "tag/TagHandler.hxx" +#include "util/Error.hxx" +#include "util/Domain.hxx" +#include "util/Macros.hxx" +#include "Log.hxx" + +#include <mpc/mpcdec.h> + +#include <math.h> + +struct mpc_decoder_data { + InputStream &is; + Decoder *decoder; + + mpc_decoder_data(InputStream &_is, Decoder *_decoder) + :is(_is), decoder(_decoder) {} +}; + +static constexpr Domain mpcdec_domain("mpcdec"); + +static mpc_int32_t +mpc_read_cb(mpc_reader *reader, void *ptr, mpc_int32_t size) +{ + struct mpc_decoder_data *data = + (struct mpc_decoder_data *)reader->data; + + return decoder_read(data->decoder, data->is, ptr, size); +} + +static mpc_bool_t +mpc_seek_cb(mpc_reader *reader, mpc_int32_t offset) +{ + struct mpc_decoder_data *data = + (struct mpc_decoder_data *)reader->data; + + return data->is.LockSeek(offset, IgnoreError()); +} + +static mpc_int32_t +mpc_tell_cb(mpc_reader *reader) +{ + struct mpc_decoder_data *data = + (struct mpc_decoder_data *)reader->data; + + return (long)data->is.GetOffset(); +} + +static mpc_bool_t +mpc_canseek_cb(mpc_reader *reader) +{ + struct mpc_decoder_data *data = + (struct mpc_decoder_data *)reader->data; + + return data->is.IsSeekable(); +} + +static mpc_int32_t +mpc_getsize_cb(mpc_reader *reader) +{ + struct mpc_decoder_data *data = + (struct mpc_decoder_data *)reader->data; + + if (!data->is.KnownSize()) + return -1; + + return data->is.GetSize(); +} + +/* this _looks_ performance-critical, don't de-inline -- eric */ +static inline int32_t +mpc_to_mpd_sample(MPC_SAMPLE_FORMAT sample) +{ + /* only doing 16-bit audio for now */ + int32_t val; + + enum { + bits = 24, + }; + + const int clip_min = -1 << (bits - 1); + const int clip_max = (1 << (bits - 1)) - 1; + +#ifdef MPC_FIXED_POINT + const int shift = bits - MPC_FIXED_POINT_SCALE_SHIFT; + + if (shift < 0) + val = sample >> -shift; + else + val = sample << shift; +#else + const int float_scale = 1 << (bits - 1); + + val = sample * float_scale; +#endif + + if (val < clip_min) + val = clip_min; + else if (val > clip_max) + val = clip_max; + + return val; +} + +static void +mpc_to_mpd_buffer(int32_t *dest, const MPC_SAMPLE_FORMAT *src, + unsigned num_samples) +{ + while (num_samples-- > 0) + *dest++ = mpc_to_mpd_sample(*src++); +} + +static void +mpcdec_decode(Decoder &mpd_decoder, InputStream &is) +{ + MPC_SAMPLE_FORMAT sample_buffer[MPC_DECODER_BUFFER_LENGTH]; + + mpc_decoder_data data(is, &mpd_decoder); + + mpc_reader reader; + reader.read = mpc_read_cb; + reader.seek = mpc_seek_cb; + reader.tell = mpc_tell_cb; + reader.get_size = mpc_getsize_cb; + reader.canseek = mpc_canseek_cb; + reader.data = &data; + + mpc_demux *demux = mpc_demux_init(&reader); + if (demux == nullptr) { + if (decoder_get_command(mpd_decoder) != DecoderCommand::STOP) + LogWarning(mpcdec_domain, + "Not a valid musepack stream"); + return; + } + + mpc_streaminfo info; + mpc_demux_get_info(demux, &info); + + Error error; + AudioFormat audio_format; + if (!audio_format_init_checked(audio_format, info.sample_freq, + SampleFormat::S24_P32, + info.channels, error)) { + LogError(error); + mpc_demux_exit(demux); + return; + } + + ReplayGainInfo rgi; + rgi.Clear(); + rgi.tuples[REPLAY_GAIN_ALBUM].gain = MPC_OLD_GAIN_REF - (info.gain_album / 256.); + rgi.tuples[REPLAY_GAIN_ALBUM].peak = pow(10, info.peak_album / 256. / 20) / 32767; + rgi.tuples[REPLAY_GAIN_TRACK].gain = MPC_OLD_GAIN_REF - (info.gain_title / 256.); + rgi.tuples[REPLAY_GAIN_TRACK].peak = pow(10, info.peak_title / 256. / 20) / 32767; + + decoder_replay_gain(mpd_decoder, &rgi); + + decoder_initialized(mpd_decoder, audio_format, + is.IsSeekable(), + SongTime::FromS(mpc_streaminfo_get_length(&info))); + + DecoderCommand cmd = DecoderCommand::NONE; + do { + if (cmd == DecoderCommand::SEEK) { + mpc_int64_t where = + decoder_seek_where_frame(mpd_decoder); + bool success; + + success = mpc_demux_seek_sample(demux, where) + == MPC_STATUS_OK; + if (success) + decoder_command_finished(mpd_decoder); + else + decoder_seek_error(mpd_decoder); + } + + mpc_uint32_t vbr_update_bits = 0; + + mpc_frame_info frame; + frame.buffer = (MPC_SAMPLE_FORMAT *)sample_buffer; + mpc_status status = mpc_demux_decode(demux, &frame); + if (status != MPC_STATUS_OK) { + LogWarning(mpcdec_domain, + "Failed to decode sample"); + break; + } + + if (frame.bits == -1) + break; + + mpc_uint32_t ret = frame.samples; + ret *= info.channels; + + int32_t chunk[ARRAY_SIZE(sample_buffer)]; + mpc_to_mpd_buffer(chunk, sample_buffer, ret); + + long bit_rate = vbr_update_bits * audio_format.sample_rate + / 1152 / 1000; + + cmd = decoder_data(mpd_decoder, is, + chunk, ret * sizeof(chunk[0]), + bit_rate); + } while (cmd != DecoderCommand::STOP); + + mpc_demux_exit(demux); +} + +static SignedSongTime +mpcdec_get_file_duration(InputStream &is) +{ + mpc_decoder_data data(is, nullptr); + + mpc_reader reader; + reader.read = mpc_read_cb; + reader.seek = mpc_seek_cb; + reader.tell = mpc_tell_cb; + reader.get_size = mpc_getsize_cb; + reader.canseek = mpc_canseek_cb; + reader.data = &data; + + mpc_demux *demux = mpc_demux_init(&reader); + if (demux == nullptr) + return SignedSongTime::Negative(); + + mpc_streaminfo info; + mpc_demux_get_info(demux, &info); + mpc_demux_exit(demux); + + return SongTime::FromS(mpc_streaminfo_get_length(&info)); +} + +static bool +mpcdec_scan_stream(InputStream &is, + const struct tag_handler *handler, void *handler_ctx) +{ + const auto duration = mpcdec_get_file_duration(is); + if (duration.IsNegative()) + return false; + + tag_handler_invoke_duration(handler, handler_ctx, SongTime(duration)); + return true; +} + +static const char *const mpcdec_suffixes[] = { "mpc", nullptr }; + +const struct DecoderPlugin mpcdec_decoder_plugin = { + "mpcdec", + nullptr, + nullptr, + mpcdec_decode, + nullptr, + nullptr, + mpcdec_scan_stream, + nullptr, + mpcdec_suffixes, + nullptr, +}; 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