decoder/{dsf,dsdiff}: convert to C++
This commit is contained in:
Max Kellermann
360
src/decoder/DsfDecoderPlugin.cxx
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360
src/decoder/DsfDecoderPlugin.cxx
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/*
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* Copyright (C) 2003-2013 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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/* \file
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*
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* This plugin decodes DSDIFF data (SACD) embedded in DSF files.
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*
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* The DSF code was created using the specification found here:
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* http://dsd-guide.com/sonys-dsf-file-format-spec
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*
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* All functions common to both DSD decoders have been moved to dsdlib
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*/
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#include "config.h"
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#include "DsfDecoderPlugin.hxx"
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#include "decoder_api.h"
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#include "audio_check.h"
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#include "util/bit_reverse.h"
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#include "DsdLib.hxx"
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#include "tag_handler.h"
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#include <unistd.h>
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#include <stdio.h> /* for SEEK_SET, SEEK_CUR */
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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "dsf"
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struct DsfMetaData {
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unsigned sample_rate, channels;
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bool bitreverse;
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uint64_t chunk_size;
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#ifdef HAVE_ID3TAG
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goffset id3_offset;
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uint64_t id3_size;
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#endif
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};
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struct DsfHeader {
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/** DSF header id: "DSD " */
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struct dsdlib_id id;
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/** DSD chunk size, including id = 28 */
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uint32_t size_low, size_high;
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/** total file size */
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uint32_t fsize_low, fsize_high;
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/** pointer to id3v2 metadata, should be at the end of the file */
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uint32_t pmeta_low, pmeta_high;
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};
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/** DSF file fmt chunk */
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struct DsfFmtChunk {
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/** id: "fmt " */
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struct dsdlib_id id;
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/** fmt chunk size, including id, normally 52 */
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uint32_t size_low, size_high;
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/** version of this format = 1 */
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uint32_t version;
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/** 0: DSD raw */
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uint32_t formatid;
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/** channel type, 1 = mono, 2 = stereo, 3 = 3 channels, etc */
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uint32_t channeltype;
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/** Channel number, 1 = mono, 2 = stereo, ... 6 = 6 channels */
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uint32_t channelnum;
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/** sample frequency: 2822400, 5644800 */
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uint32_t sample_freq;
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/** bits per sample 1 or 8 */
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uint32_t bitssample;
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/** Sample count per channel in bytes */
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uint32_t scnt_low, scnt_high;
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/** block size per channel = 4096 */
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uint32_t block_size;
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/** reserved, should be all zero */
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uint32_t reserved;
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};
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struct DsfDataChunk {
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struct dsdlib_id id;
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/** "data" chunk size, includes header (id+size) */
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uint32_t size_low, size_high;
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};
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/**
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* Read and parse all needed metadata chunks for DSF files.
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*/
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static bool
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dsf_read_metadata(struct decoder *decoder, struct input_stream *is,
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DsfMetaData *metadata)
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{
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uint64_t chunk_size;
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DsfHeader dsf_header;
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if (!dsdlib_read(decoder, is, &dsf_header, sizeof(dsf_header)) ||
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!dsdlib_id_equals(&dsf_header.id, "DSD "))
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return false;
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chunk_size = (((uint64_t)GUINT32_FROM_LE(dsf_header.size_high)) << 32) |
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((uint64_t)GUINT32_FROM_LE(dsf_header.size_low));
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if (sizeof(dsf_header) != chunk_size)
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return false;
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#ifdef HAVE_ID3TAG
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uint64_t metadata_offset;
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metadata_offset = (((uint64_t)GUINT32_FROM_LE(dsf_header.pmeta_high)) << 32) |
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((uint64_t)GUINT32_FROM_LE(dsf_header.pmeta_low));
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#endif
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/* read the 'fmt ' chunk of the DSF file */
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DsfFmtChunk dsf_fmt_chunk;
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if (!dsdlib_read(decoder, is, &dsf_fmt_chunk, sizeof(dsf_fmt_chunk)) ||
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!dsdlib_id_equals(&dsf_fmt_chunk.id, "fmt "))
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return false;
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uint64_t fmt_chunk_size;
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fmt_chunk_size = (((uint64_t)GUINT32_FROM_LE(dsf_fmt_chunk.size_high)) << 32) |
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((uint64_t)GUINT32_FROM_LE(dsf_fmt_chunk.size_low));
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if (fmt_chunk_size != sizeof(dsf_fmt_chunk))
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return false;
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uint32_t samplefreq = (uint32_t)GUINT32_FROM_LE(dsf_fmt_chunk.sample_freq);
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/* for now, only support version 1 of the standard, DSD raw stereo
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files with a sample freq of 2822400 Hz */
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if (dsf_fmt_chunk.version != 1 || dsf_fmt_chunk.formatid != 0
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|| dsf_fmt_chunk.channeltype != 2
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|| dsf_fmt_chunk.channelnum != 2
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|| samplefreq != 2822400)
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return false;
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uint32_t chblksize = (uint32_t)GUINT32_FROM_LE(dsf_fmt_chunk.block_size);
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/* according to the spec block size should always be 4096 */
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if (chblksize != 4096)
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return false;
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/* read the 'data' chunk of the DSF file */
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DsfDataChunk data_chunk;
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if (!dsdlib_read(decoder, is, &data_chunk, sizeof(data_chunk)) ||
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!dsdlib_id_equals(&data_chunk.id, "data"))
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return false;
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/* data size of DSF files are padded to multiple of 4096,
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we use the actual data size as chunk size */
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uint64_t data_size;
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data_size = (((uint64_t)GUINT32_FROM_LE(data_chunk.size_high)) << 32) |
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((uint64_t)GUINT32_FROM_LE(data_chunk.size_low));
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data_size -= sizeof(data_chunk);
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metadata->chunk_size = data_size;
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/* data_size cannot be bigger or equal to total file size */
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const uint64_t size = (uint64_t)input_stream_get_size(is);
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if (data_size >= size)
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return false;
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metadata->channels = (unsigned) dsf_fmt_chunk.channelnum;
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metadata->sample_rate = samplefreq;
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#ifdef HAVE_ID3TAG
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/* metada_offset cannot be bigger then or equal to total file size */
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if (metadata_offset >= size)
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metadata->id3_offset = 0;
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else
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metadata->id3_offset = (goffset) metadata_offset;
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#endif
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/* check bits per sample format, determine if bitreverse is needed */
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metadata->bitreverse = dsf_fmt_chunk.bitssample == 1;
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return true;
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}
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static void
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bit_reverse_buffer(uint8_t *p, uint8_t *end)
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{
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for (; p < end; ++p)
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*p = bit_reverse(*p);
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}
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/**
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* DSF data is build up of alternating 4096 blocks of DSD samples for left and
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* right. Convert the buffer holding 1 block of 4096 DSD left samples and 1
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* block of 4096 DSD right samples to 8k of samples in normal PCM left/right
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* order.
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*/
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static void
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dsf_to_pcm_order(uint8_t *dest, uint8_t *scratch, size_t nrbytes)
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{
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for (unsigned i = 0, j = 0; i < (unsigned)nrbytes; i += 2) {
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scratch[i] = *(dest+j);
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j++;
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}
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for (unsigned i = 1, j = 0; i < (unsigned) nrbytes; i += 2) {
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scratch[i] = *(dest+4096+j);
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j++;
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}
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for (unsigned i = 0; i < (unsigned)nrbytes; i++) {
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*dest = scratch[i];
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dest++;
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}
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}
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/**
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* Decode one complete DSF 'data' chunk i.e. a complete song
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*/
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static bool
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dsf_decode_chunk(struct decoder *decoder, struct input_stream *is,
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unsigned channels,
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uint64_t chunk_size,
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bool bitreverse)
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{
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uint8_t buffer[8192];
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/* scratch buffer for DSF samples to convert to the needed
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normal left/right regime of samples */
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uint8_t dsf_scratch_buffer[8192];
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const size_t sample_size = sizeof(buffer[0]);
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const size_t frame_size = channels * sample_size;
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const unsigned buffer_frames = sizeof(buffer) / frame_size;
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const unsigned buffer_samples = buffer_frames * frame_size;
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const size_t buffer_size = buffer_samples * sample_size;
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while (chunk_size > 0) {
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/* see how much aligned data from the remaining chunk
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fits into the local buffer */
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unsigned now_frames = buffer_frames;
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size_t now_size = buffer_size;
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if (chunk_size < (uint64_t)now_size) {
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now_frames = (unsigned)chunk_size / frame_size;
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now_size = now_frames * frame_size;
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}
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size_t nbytes = decoder_read(decoder, is, buffer, now_size);
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if (nbytes != now_size)
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return false;
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chunk_size -= nbytes;
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if (bitreverse)
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bit_reverse_buffer(buffer, buffer + nbytes);
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dsf_to_pcm_order(buffer, dsf_scratch_buffer, nbytes);
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enum decoder_command cmd =
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decoder_data(decoder, is, buffer, nbytes, 0);
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switch (cmd) {
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case DECODE_COMMAND_NONE:
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break;
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case DECODE_COMMAND_START:
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case DECODE_COMMAND_STOP:
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return false;
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case DECODE_COMMAND_SEEK:
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/* not implemented yet */
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decoder_seek_error(decoder);
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break;
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}
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}
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return dsdlib_skip(decoder, is, chunk_size);
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}
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static void
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dsf_stream_decode(struct decoder *decoder, struct input_stream *is)
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{
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/* check if it is a proper DSF file */
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DsfMetaData metadata;
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if (!dsf_read_metadata(decoder, is, &metadata))
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return;
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GError *error = NULL;
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struct audio_format audio_format;
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if (!audio_format_init_checked(&audio_format, metadata.sample_rate / 8,
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SAMPLE_FORMAT_DSD,
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metadata.channels, &error)) {
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g_warning("%s", error->message);
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g_error_free(error);
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return;
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}
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/* Calculate song time from DSD chunk size and sample frequency */
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uint64_t chunk_size = metadata.chunk_size;
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float songtime = ((chunk_size / metadata.channels) * 8) /
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(float) metadata.sample_rate;
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/* success: file was recognized */
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decoder_initialized(decoder, &audio_format, false, songtime);
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if (!dsf_decode_chunk(decoder, is, metadata.channels,
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chunk_size,
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metadata.bitreverse))
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return;
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}
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static bool
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dsf_scan_stream(struct input_stream *is,
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G_GNUC_UNUSED const struct tag_handler *handler,
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G_GNUC_UNUSED void *handler_ctx)
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{
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/* check DSF metadata */
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DsfMetaData metadata;
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if (!dsf_read_metadata(NULL, is, &metadata))
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return false;
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struct audio_format audio_format;
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if (!audio_format_init_checked(&audio_format, metadata.sample_rate / 8,
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SAMPLE_FORMAT_DSD,
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metadata.channels, NULL))
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/* refuse to parse files which we cannot play anyway */
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return false;
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/* calculate song time and add as tag */
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unsigned songtime = ((metadata.chunk_size / metadata.channels) * 8) /
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metadata.sample_rate;
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tag_handler_invoke_duration(handler, handler_ctx, songtime);
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#ifdef HAVE_ID3TAG
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/* Add available tags from the ID3 tag */
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dsdlib_tag_id3(is, handler, handler_ctx, metadata.id3_offset);
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#endif
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return true;
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}
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static const char *const dsf_suffixes[] = {
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"dsf",
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NULL
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};
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static const char *const dsf_mime_types[] = {
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"application/x-dsf",
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NULL
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};
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const struct decoder_plugin dsf_decoder_plugin = {
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"dsf",
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nullptr,
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nullptr,
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dsf_stream_decode,
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nullptr,
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nullptr,
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dsf_scan_stream,
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nullptr,
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dsf_suffixes,
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dsf_mime_types,
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};
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