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Diffstat (limited to '')
| -rw-r--r-- | src/decoder/plugins/DsfDecoderPlugin.cxx | 383 |
1 files changed, 383 insertions, 0 deletions
diff --git a/src/decoder/plugins/DsfDecoderPlugin.cxx b/src/decoder/plugins/DsfDecoderPlugin.cxx new file mode 100644 index 000000000..690616d15 --- /dev/null +++ b/src/decoder/plugins/DsfDecoderPlugin.cxx @@ -0,0 +1,383 @@ +/* + * 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. + */ + +/* \file + * + * This plugin decodes DSDIFF data (SACD) embedded in DSF files. + * + * The DSF code was created using the specification found here: + * http://dsd-guide.com/sonys-dsf-file-format-spec + * + * All functions common to both DSD decoders have been moved to dsdlib + */ + +#include "config.h" +#include "DsfDecoderPlugin.hxx" +#include "../DecoderAPI.hxx" +#include "input/InputStream.hxx" +#include "CheckAudioFormat.hxx" +#include "util/bit_reverse.h" +#include "util/Error.hxx" +#include "system/ByteOrder.hxx" +#include "DsdLib.hxx" +#include "tag/TagHandler.hxx" +#include "Log.hxx" + +#include <string.h> + +static constexpr unsigned DSF_BLOCK_SIZE = 4096; + +struct DsfMetaData { + unsigned sample_rate, channels; + bool bitreverse; + offset_type n_blocks; +#ifdef HAVE_ID3TAG + offset_type id3_offset; +#endif +}; + +struct DsfHeader { + /** DSF header id: "DSD " */ + DsdId id; + /** DSD chunk size, including id = 28 */ + DsdUint64 size; + /** total file size */ + DsdUint64 fsize; + /** pointer to id3v2 metadata, should be at the end of the file */ + DsdUint64 pmeta; +}; + +/** DSF file fmt chunk */ +struct DsfFmtChunk { + /** id: "fmt " */ + DsdId id; + /** fmt chunk size, including id, normally 52 */ + DsdUint64 size; + /** version of this format = 1 */ + uint32_t version; + /** 0: DSD raw */ + uint32_t formatid; + /** channel type, 1 = mono, 2 = stereo, 3 = 3 channels, etc */ + uint32_t channeltype; + /** Channel number, 1 = mono, 2 = stereo, ... 6 = 6 channels */ + uint32_t channelnum; + /** sample frequency: 2822400, 5644800 */ + uint32_t sample_freq; + /** bits per sample 1 or 8 */ + uint32_t bitssample; + /** Sample count per channel in bytes */ + DsdUint64 scnt; + /** block size per channel = 4096 */ + uint32_t block_size; + /** reserved, should be all zero */ + uint32_t reserved; +}; + +struct DsfDataChunk { + DsdId id; + /** "data" chunk size, includes header (id+size) */ + DsdUint64 size; +}; + +/** + * Read and parse all needed metadata chunks for DSF files. + */ +static bool +dsf_read_metadata(Decoder *decoder, InputStream &is, + DsfMetaData *metadata) +{ + DsfHeader dsf_header; + if (!decoder_read_full(decoder, is, &dsf_header, sizeof(dsf_header)) || + !dsf_header.id.Equals("DSD ")) + return false; + + const offset_type chunk_size = dsf_header.size.Read(); + if (sizeof(dsf_header) != chunk_size) + return false; + +#ifdef HAVE_ID3TAG + const offset_type metadata_offset = dsf_header.pmeta.Read(); +#endif + + /* read the 'fmt ' chunk of the DSF file */ + DsfFmtChunk dsf_fmt_chunk; + if (!decoder_read_full(decoder, is, + &dsf_fmt_chunk, sizeof(dsf_fmt_chunk)) || + !dsf_fmt_chunk.id.Equals("fmt ")) + return false; + + const uint64_t fmt_chunk_size = dsf_fmt_chunk.size.Read(); + if (fmt_chunk_size != sizeof(dsf_fmt_chunk)) + return false; + + uint32_t samplefreq = FromLE32(dsf_fmt_chunk.sample_freq); + const unsigned channels = FromLE32(dsf_fmt_chunk.channelnum); + + /* for now, only support version 1 of the standard, DSD raw stereo + files with a sample freq of 2822400 or 5644800 Hz */ + + if (FromLE32(dsf_fmt_chunk.version) != 1 || + FromLE32(dsf_fmt_chunk.formatid) != 0 || + !audio_valid_channel_count(channels) || + !dsdlib_valid_freq(samplefreq)) + return false; + + uint32_t chblksize = FromLE32(dsf_fmt_chunk.block_size); + /* according to the spec block size should always be 4096 */ + if (chblksize != DSF_BLOCK_SIZE) + return false; + + /* read the 'data' chunk of the DSF file */ + DsfDataChunk data_chunk; + if (!decoder_read_full(decoder, is, &data_chunk, sizeof(data_chunk)) || + !data_chunk.id.Equals("data")) + return false; + + /* data size of DSF files are padded to multiple of 4096, + we use the actual data size as chunk size */ + + offset_type data_size = data_chunk.size.Read(); + if (data_size < sizeof(data_chunk)) + return false; + + data_size -= sizeof(data_chunk); + + /* data_size cannot be bigger or equal to total file size */ + if (is.KnownSize() && data_size > is.GetRest()) + return false; + + /* use the sample count from the DSF header as the upper + bound, because some DSF files contain junk at the end of + the "data" chunk */ + const uint64_t samplecnt = dsf_fmt_chunk.scnt.Read(); + const offset_type playable_size = samplecnt * channels / 8; + if (data_size > playable_size) + data_size = playable_size; + + const size_t block_size = channels * DSF_BLOCK_SIZE; + metadata->n_blocks = data_size / block_size; + metadata->channels = channels; + metadata->sample_rate = samplefreq; +#ifdef HAVE_ID3TAG + metadata->id3_offset = metadata_offset; +#endif + /* check bits per sample format, determine if bitreverse is needed */ + metadata->bitreverse = FromLE32(dsf_fmt_chunk.bitssample) == 1; + return true; +} + +static void +bit_reverse_buffer(uint8_t *p, uint8_t *end) +{ + for (; p < end; ++p) + *p = bit_reverse(*p); +} + +static void +InterleaveDsfBlockMono(uint8_t *gcc_restrict dest, + const uint8_t *gcc_restrict src) +{ + memcpy(dest, src, DSF_BLOCK_SIZE); +} + +/** + * DSF data is build up of alternating 4096 blocks of DSD samples for left and + * right. Convert the buffer holding 1 block of 4096 DSD left samples and 1 + * block of 4096 DSD right samples to 8k of samples in normal PCM left/right + * order. + */ +static void +InterleaveDsfBlockStereo(uint8_t *gcc_restrict dest, + const uint8_t *gcc_restrict src) +{ + for (size_t i = 0; i < DSF_BLOCK_SIZE; ++i) { + dest[2 * i] = src[i]; + dest[2 * i + 1] = src[DSF_BLOCK_SIZE + i]; + } +} + +static void +InterleaveDsfBlockChannel(uint8_t *gcc_restrict dest, + const uint8_t *gcc_restrict src, + unsigned channels) +{ + for (size_t i = 0; i < DSF_BLOCK_SIZE; ++i, dest += channels, ++src) + *dest = *src; +} + +static void +InterleaveDsfBlockGeneric(uint8_t *gcc_restrict dest, + const uint8_t *gcc_restrict src, + unsigned channels) +{ + for (unsigned c = 0; c < channels; ++c, ++dest, src += DSF_BLOCK_SIZE) + InterleaveDsfBlockChannel(dest, src, channels); +} + +static void +InterleaveDsfBlock(uint8_t *gcc_restrict dest, const uint8_t *gcc_restrict src, + unsigned channels) +{ + if (channels == 1) + InterleaveDsfBlockMono(dest, src); + else if (channels == 2) + InterleaveDsfBlockStereo(dest, src); + else + InterleaveDsfBlockGeneric(dest, src, channels); +} + +static offset_type +FrameToBlock(uint64_t frame) +{ + return frame / DSF_BLOCK_SIZE; +} + +/** + * Decode one complete DSF 'data' chunk i.e. a complete song + */ +static bool +dsf_decode_chunk(Decoder &decoder, InputStream &is, + unsigned channels, unsigned sample_rate, + offset_type n_blocks, + bool bitreverse) +{ + const size_t block_size = channels * DSF_BLOCK_SIZE; + const offset_type start_offset = is.GetOffset(); + + auto cmd = decoder_get_command(decoder); + for (offset_type i = 0; i < n_blocks && cmd != DecoderCommand::STOP;) { + if (cmd == DecoderCommand::SEEK) { + uint64_t frame = decoder_seek_where_frame(decoder); + offset_type block = FrameToBlock(frame); + if (block >= n_blocks) { + decoder_command_finished(decoder); + break; + } + + offset_type offset = + start_offset + block * block_size; + if (dsdlib_skip_to(&decoder, is, offset)) { + decoder_command_finished(decoder); + i = block; + } else + decoder_seek_error(decoder); + } + + /* worst-case buffer size */ + uint8_t buffer[MAX_CHANNELS * DSF_BLOCK_SIZE]; + if (!decoder_read_full(&decoder, is, buffer, block_size)) + return false; + + if (bitreverse) + bit_reverse_buffer(buffer, buffer + block_size); + + uint8_t interleaved_buffer[MAX_CHANNELS * DSF_BLOCK_SIZE]; + InterleaveDsfBlock(interleaved_buffer, buffer, channels); + + cmd = decoder_data(decoder, is, + interleaved_buffer, block_size, + sample_rate / 1000); + ++i; + } + + return true; +} + +static void +dsf_stream_decode(Decoder &decoder, InputStream &is) +{ + /* check if it is a proper DSF file */ + DsfMetaData metadata; + if (!dsf_read_metadata(&decoder, is, &metadata)) + return; + + Error error; + AudioFormat audio_format; + if (!audio_format_init_checked(audio_format, metadata.sample_rate / 8, + SampleFormat::DSD, + metadata.channels, error)) { + LogError(error); + return; + } + /* Calculate song time from DSD chunk size and sample frequency */ + const auto n_blocks = metadata.n_blocks; + auto songtime = SongTime::FromScale<uint64_t>(n_blocks * DSF_BLOCK_SIZE, + audio_format.sample_rate); + + /* success: file was recognized */ + decoder_initialized(decoder, audio_format, is.IsSeekable(), songtime); + + dsf_decode_chunk(decoder, is, metadata.channels, + metadata.sample_rate, + n_blocks, + metadata.bitreverse); +} + +static bool +dsf_scan_stream(InputStream &is, + gcc_unused const struct tag_handler *handler, + gcc_unused void *handler_ctx) +{ + /* check DSF metadata */ + DsfMetaData metadata; + if (!dsf_read_metadata(nullptr, is, &metadata)) + return false; + + AudioFormat audio_format; + if (!audio_format_init_checked(audio_format, metadata.sample_rate / 8, + SampleFormat::DSD, + metadata.channels, IgnoreError())) + /* refuse to parse files which we cannot play anyway */ + return false; + + /* calculate song time and add as tag */ + const auto n_blocks = metadata.n_blocks; + auto songtime = SongTime::FromScale<uint64_t>(n_blocks * DSF_BLOCK_SIZE, + audio_format.sample_rate); + tag_handler_invoke_duration(handler, handler_ctx, songtime); + +#ifdef HAVE_ID3TAG + /* Add available tags from the ID3 tag */ + dsdlib_tag_id3(is, handler, handler_ctx, metadata.id3_offset); +#endif + return true; +} + +static const char *const dsf_suffixes[] = { + "dsf", + nullptr +}; + +static const char *const dsf_mime_types[] = { + "application/x-dsf", + nullptr +}; + +const struct DecoderPlugin dsf_decoder_plugin = { + "dsf", + nullptr, + nullptr, + dsf_stream_decode, + nullptr, + nullptr, + dsf_scan_stream, + nullptr, + dsf_suffixes, + dsf_mime_types, +}; |