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Diffstat (limited to 'src/decoder/DsfDecoderPlugin.cxx')
-rw-r--r-- | src/decoder/DsfDecoderPlugin.cxx | 360 |
1 files changed, 0 insertions, 360 deletions
diff --git a/src/decoder/DsfDecoderPlugin.cxx b/src/decoder/DsfDecoderPlugin.cxx deleted file mode 100644 index 5ef94e647..000000000 --- a/src/decoder/DsfDecoderPlugin.cxx +++ /dev/null @@ -1,360 +0,0 @@ -/* - * Copyright (C) 2003-2013 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 "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 <unistd.h> -#include <stdio.h> /* for SEEK_SET, SEEK_CUR */ - -struct DsfMetaData { - unsigned sample_rate, channels; - bool bitreverse; - uint64_t chunk_size; -#ifdef HAVE_ID3TAG - InputStream::offset_type id3_offset; - uint64_t id3_size; -#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 (!dsdlib_read(decoder, is, &dsf_header, sizeof(dsf_header)) || - !dsf_header.id.Equals("DSD ")) - return false; - - const uint64_t chunk_size = dsf_header.size.Read(); - if (sizeof(dsf_header) != chunk_size) - return false; - -#ifdef HAVE_ID3TAG - const uint64_t metadata_offset = dsf_header.pmeta.Read(); -#endif - - /* read the 'fmt ' chunk of the DSF file */ - DsfFmtChunk dsf_fmt_chunk; - if (!dsdlib_read(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); - - /* for now, only support version 1 of the standard, DSD raw stereo - files with a sample freq of 2822400 or 5644800 Hz */ - - if (dsf_fmt_chunk.version != 1 || dsf_fmt_chunk.formatid != 0 - || dsf_fmt_chunk.channeltype != 2 - || dsf_fmt_chunk.channelnum != 2 - || (samplefreq != 2822400 && samplefreq != 5644800)) - return false; - - uint32_t chblksize = FromLE32(dsf_fmt_chunk.block_size); - /* according to the spec block size should always be 4096 */ - if (chblksize != 4096) - return false; - - /* read the 'data' chunk of the DSF file */ - DsfDataChunk data_chunk; - if (!dsdlib_read(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 */ - - uint64_t 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 */ - const uint64_t size = (uint64_t)is.GetSize(); - if (data_size >= size) - 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 uint64_t playable_size = samplecnt * 2 / 8; - if (data_size > playable_size) - data_size = playable_size; - - metadata->chunk_size = data_size; - metadata->channels = (unsigned) dsf_fmt_chunk.channelnum; - metadata->sample_rate = samplefreq; -#ifdef HAVE_ID3TAG - /* metada_offset cannot be bigger then or equal to total file size */ - if (metadata_offset >= size) - metadata->id3_offset = 0; - else - metadata->id3_offset = (InputStream::offset_type)metadata_offset; -#endif - /* check bits per sample format, determine if bitreverse is needed */ - metadata->bitreverse = 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); -} - -/** - * 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 -dsf_to_pcm_order(uint8_t *dest, uint8_t *scratch, size_t nrbytes) -{ - for (unsigned i = 0, j = 0; i < (unsigned)nrbytes; i += 2) { - scratch[i] = *(dest+j); - j++; - } - - for (unsigned i = 1, j = 0; i < (unsigned) nrbytes; i += 2) { - scratch[i] = *(dest+4096+j); - j++; - } - - for (unsigned i = 0; i < (unsigned)nrbytes; i++) { - *dest = scratch[i]; - dest++; - } -} - -/** - * Decode one complete DSF 'data' chunk i.e. a complete song - */ -static bool -dsf_decode_chunk(Decoder &decoder, InputStream &is, - unsigned channels, - uint64_t chunk_size, - bool bitreverse) -{ - uint8_t buffer[8192]; - - /* scratch buffer for DSF samples to convert to the needed - normal left/right regime of samples */ - uint8_t dsf_scratch_buffer[8192]; - - const size_t sample_size = sizeof(buffer[0]); - const size_t frame_size = channels * sample_size; - const unsigned buffer_frames = sizeof(buffer) / frame_size; - const unsigned buffer_samples = buffer_frames * frame_size; - const size_t buffer_size = buffer_samples * sample_size; - - while (chunk_size > 0) { - /* see how much aligned data from the remaining chunk - fits into the local buffer */ - size_t now_size = buffer_size; - if (chunk_size < (uint64_t)now_size) { - unsigned now_frames = - (unsigned)chunk_size / frame_size; - now_size = now_frames * frame_size; - } - - size_t nbytes = decoder_read(&decoder, is, buffer, now_size); - if (nbytes != now_size) - return false; - - chunk_size -= nbytes; - - if (bitreverse) - bit_reverse_buffer(buffer, buffer + nbytes); - - dsf_to_pcm_order(buffer, dsf_scratch_buffer, nbytes); - - const auto cmd = decoder_data(decoder, is, buffer, nbytes, 0); - switch (cmd) { - case DecoderCommand::NONE: - break; - - case DecoderCommand::START: - case DecoderCommand::STOP: - return false; - - case DecoderCommand::SEEK: - - /* not implemented yet */ - decoder_seek_error(decoder); - break; - } - } - return dsdlib_skip(&decoder, is, chunk_size); -} - -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 */ - uint64_t chunk_size = metadata.chunk_size; - float songtime = ((chunk_size / metadata.channels) * 8) / - (float) metadata.sample_rate; - - /* success: file was recognized */ - decoder_initialized(decoder, audio_format, false, songtime); - - if (!dsf_decode_chunk(decoder, is, metadata.channels, - chunk_size, - metadata.bitreverse)) - return; -} - -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 */ - unsigned songtime = ((metadata.chunk_size / metadata.channels) * 8) / - metadata.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, -}; |