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/*
* Squeezelite - lightweight headless squeezebox emulator
*
* (c) Adrian Smith 2012-2015, triode1@btinternet.com
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
// dsd support
#include "squeezelite.h"
#if DSD
// use dsd2pcm from Sebastian Gesemann for conversion to pcm:
#include "./dsd2pcm/dsd2pcm.h"
extern log_level loglevel;
extern struct buffer *streambuf;
extern struct buffer *outputbuf;
extern struct streamstate stream;
extern struct outputstate output;
extern struct decodestate decode;
extern struct processstate process;
#define LOCK_S mutex_lock(streambuf->mutex)
#define UNLOCK_S mutex_unlock(streambuf->mutex)
#define LOCK_O mutex_lock(outputbuf->mutex)
#define UNLOCK_O mutex_unlock(outputbuf->mutex)
#if PROCESS
#define LOCK_O_direct if (decode.direct) mutex_lock(outputbuf->mutex)
#define UNLOCK_O_direct if (decode.direct) mutex_unlock(outputbuf->mutex)
#define LOCK_O_not_direct if (!decode.direct) mutex_lock(outputbuf->mutex)
#define UNLOCK_O_not_direct if (!decode.direct) mutex_unlock(outputbuf->mutex)
#define IF_DIRECT(x) if (decode.direct) { x }
#define IF_PROCESS(x) if (!decode.direct) { x }
#else
#define LOCK_O_direct mutex_lock(outputbuf->mutex)
#define UNLOCK_O_direct mutex_unlock(outputbuf->mutex)
#define LOCK_O_not_direct
#define UNLOCK_O_not_direct
#define IF_DIRECT(x) { x }
#define IF_PROCESS(x)
#endif
#define BLOCK 4096 // expected size of dsd block
#define BLOCK_FRAMES BLOCK * BYTES_PER_FRAME
#define WRAP_BUF_SIZE 16
typedef enum { UNKNOWN=0, DSF, DSDIFF } dsd_type;
static bool dop = false; // local copy of output.has_dop to avoid holding output lock
struct dsd {
dsd_type type;
u32_t consume;
u32_t sample_rate;
u32_t channels;
u64_t sample_bytes;
u32_t block_size;
bool lsb_first;
dsd2pcm_ctx *dsd2pcm_ctx[2];
float *transfer[2];
};
static struct dsd *d;
static u64_t unpack64be(const u8_t *p) {
return
(u64_t)p[0] << 56 | (u64_t)p[1] << 48 | (u64_t)p[2] << 40 | (u64_t)p[3] << 32 |
(u64_t)p[4] << 24 | (u64_t)p[5] << 16 | (u64_t)p[6] << 8 | (u64_t)p[7];
}
static u64_t unpack64le(const u8_t *p) {
return
(u64_t)p[7] << 56 | (u64_t)p[6] << 48 | (u64_t)p[5] << 40 | (u64_t)p[4] << 32 |
(u64_t)p[3] << 24 | (u64_t)p[2] << 16 | (u64_t)p[1] << 8 | (u64_t)p[0];
}
static u32_t unpack32le(const u8_t *p) {
return
(u32_t)p[3] << 24 | (u32_t)p[2] << 16 | (u32_t)p[1] << 8 | (u32_t)p[0];
}
static int _read_header(void) {
unsigned bytes = min(_buf_used(streambuf), _buf_cont_read(streambuf));
s32_t consume;
if (!d->type && bytes >= 4) {
if (!memcmp(streambuf->readp, "FRM8", 4)) {
d->type = DSDIFF;
} else if (!memcmp(streambuf->readp, "DSD ", 4)) {
d->type = DSF;
} else {
LOG_SQ_WARN("bad type");
return -1;
}
}
while (bytes >= 16) {
char id[5];
u64_t len = d->type == DSDIFF ? unpack64be(streambuf->readp + 4) : unpack64le(streambuf->readp + 4);
memcpy(id, streambuf->readp, 4);
id[4] = '\0';
consume = 0;
if (d->type == DSDIFF) {
if (!strcmp(id, "FRM8")) {
if (!memcmp(streambuf->readp + 12, "DSD ", 4)) {
consume = 16; // read into
} else {
LOG_SQ_WARN("bad dsdiff FRM8");
return -1;
}
}
if (!strcmp(id, "PROP") && !memcmp(streambuf->readp + 12, "SND ", 4)) {
consume = 16; // read into
}
if (!strcmp(id, "FVER")) {
LOG_SQ_INFO("DSDIFF version: %u.%u.%u.%u", *(streambuf->readp + 12), *(streambuf->readp + 13),
*(streambuf->readp + 14), *(streambuf->readp + 15));
}
if (!strcmp(id, "FS ")) {
d->sample_rate = unpackN((void *)(streambuf->readp + 12));
LOG_SQ_INFO("sample rate: %u", d->sample_rate);
}
if (!strcmp(id, "CHNL")) {
d->channels = unpackn((void *)(streambuf->readp + 12));
LOG_SQ_INFO("channels: %u", d->channels);
}
if (!strcmp(id, "DSD ")) {
LOG_SQ_INFO("found dsd len: " FMT_u64, len);
d->sample_bytes = len;
_buf_inc_readp(streambuf, 12);
bytes -= 12;
return 1; // got to the audio
}
}
if (d->type == DSF) {
if (!strcmp(id, "fmt ")) {
if (bytes >= len && bytes >= 52) {
u32_t version = unpack32le((void *)(streambuf->readp + 12));
u32_t format = unpack32le((void *)(streambuf->readp + 16));
LOG_SQ_INFO("DSF version: %u format: %u", version, format);
if (format != 0) {
LOG_SQ_WARN("only support DSD raw format");
return -1;
}
d->channels = unpack32le((void *)(streambuf->readp + 24));
d->sample_rate = unpack32le((void *)(streambuf->readp + 28));
d->lsb_first = (unpack32le((void *)(streambuf->readp + 32)) == 1);
d->sample_bytes = unpack64le((void *)(streambuf->readp + 36)) / 8;
d->block_size = unpack32le((void *)(streambuf->readp + 44));
LOG_SQ_INFO("channels: %u", d->channels);
LOG_SQ_INFO("sample rate: %u", d->sample_rate);
LOG_SQ_INFO("lsb first: %u", d->lsb_first);
LOG_SQ_INFO("sample bytes: " FMT_u64, d->sample_bytes);
LOG_SQ_INFO("block size: %u", d->block_size);
} else {
consume = -1; // come back later
}
}
if (!strcmp(id, "data")) {
LOG_SQ_INFO("found dsd len: " FMT_u64, len);
_buf_inc_readp(streambuf, 12);
bytes -= 12;
return 1; // got to the audio
}
}
// default to consuming whole chunk
if (!consume) {
consume = (s32_t)((d->type == DSDIFF) ? len + 12 : len);
}
if (bytes >= consume) {
LOG_SQ_DEBUG("id: %s len: " FMT_u64 " consume: %d", id, len, consume);
_buf_inc_readp(streambuf, consume);
bytes -= consume;
} else if (consume > 0) {
LOG_SQ_DEBUG("id: %s len: " FMT_u64 " consume: %d - partial consume: %u", id, len, consume, bytes);
_buf_inc_readp(streambuf, bytes);
d->consume = consume - bytes;
break;
} else {
break;
}
}
return 0;
}
static decode_state _decode_dsf(void) {
// samples in streambuf are interleaved on block basis
// we transfer whole blocks for all channels in one call and so itterate the while loop below to handle wraps
unsigned bytes = _buf_used(streambuf);
unsigned block_left = d->block_size;
unsigned bytes_per_frame = dop ? 2 : 1;
if (bytes < d->block_size * d->channels) {
LOG_SQ_INFO("stream too short"); // this can occur when scanning the track
return DECODE_COMPLETE;
}
IF_PROCESS(
process.in_frames = 0;
);
while (block_left) {
frames_t frames, out, count;
unsigned bytes_read;
u8_t *iptrl = (u8_t *)streambuf->readp;
u8_t *iptrr = (u8_t *)streambuf->readp + d->block_size;
u32_t *optr;
if (iptrr >= streambuf->wrap) {
iptrr -= streambuf->size;
}
bytes = min(block_left, min(streambuf->wrap - iptrl, streambuf->wrap - iptrr));
IF_DIRECT(
out = min(_buf_space(outputbuf), _buf_cont_write(outputbuf)) / BYTES_PER_FRAME;
optr = (u32_t *)outputbuf->writep;
);
IF_PROCESS(
out = process.max_in_frames - process.in_frames;
optr = (u32_t *)(process.inbuf + process.in_frames * BYTES_PER_FRAME);
);
frames = min(bytes, d->sample_bytes) / bytes_per_frame;
if (frames == 0) {
if (dop && d->sample_bytes == 1 && bytes >= 2) {
// 1 byte left add a byte of silence and play
*(iptrl + 1) = *(iptrr + 1) = 0x69;
frames = 1;
} else {
// should not get here due to wrapping m/2 for dop should never result in 0 as header len is always even
LOG_SQ_INFO("frames got to zero");
return DECODE_COMPLETE;
}
}
frames = min(frames, out);
frames = min(frames, BLOCK);
bytes_read = frames * bytes_per_frame;
count = frames;
if (dop) {
if (d->channels == 1) {
if (d->lsb_first) {
while (count--) {
*(optr++) = dsd2pcm_bitreverse[*(iptrl)] << 16 | dsd2pcm_bitreverse[*(iptrl+1)] << 8;
*(optr++) = dsd2pcm_bitreverse[*(iptrl)] << 16 | dsd2pcm_bitreverse[*(iptrl+1)] << 8;
iptrl += 2;
}
} else {
while (count--) {
*(optr++) = *(iptrl) << 16 | *(iptrl+1) << 8;
*(optr++) = *(iptrl) << 16 | *(iptrl+1) << 8;
iptrl += 2;
}
}
} else {
if (d->lsb_first) {
while (count--) {
*(optr++) = dsd2pcm_bitreverse[*(iptrl)] << 16 | dsd2pcm_bitreverse[*(iptrl+1)] << 8;
*(optr++) = dsd2pcm_bitreverse[*(iptrr)] << 16 | dsd2pcm_bitreverse[*(iptrr+1)] << 8;
iptrl += 2;
iptrr += 2;
}
} else {
while (count--) {
*(optr++) = *(iptrl) << 16 | *(iptrl+1) << 8;
*(optr++) = *(iptrr) << 16 | *(iptrr+1) << 8;
iptrl += 2;
iptrr += 2;
}
}
}
} else {
if (d->channels == 1) {
float *iptrf = d->transfer[0];
dsd2pcm_translate(d->dsd2pcm_ctx[0], frames, iptrl, 1, d->lsb_first, iptrf, 1);
while (count--) {
double scaled = *iptrf++ * 0x7fffffff;
if (scaled > 2147483647.0) scaled = 2147483647.0;
if (scaled < -2147483648.0) scaled = -2147483648.0;
*optr++ = (s32_t)scaled;
*optr++ = (s32_t)scaled;
}
} else {
float *iptrfl = d->transfer[0];
float *iptrfr = d->transfer[1];
dsd2pcm_translate(d->dsd2pcm_ctx[0], frames, iptrl, 1, d->lsb_first, iptrfl, 1);
dsd2pcm_translate(d->dsd2pcm_ctx[1], frames, iptrr, 1, d->lsb_first, iptrfr, 1);
while (count--) {
double scaledl = *iptrfl++ * 0x7fffffff;
double scaledr = *iptrfr++ * 0x7fffffff;
if (scaledl > 2147483647.0) scaledl = 2147483647.0;
if (scaledl < -2147483648.0) scaledl = -2147483648.0;
if (scaledr > 2147483647.0) scaledr = 2147483647.0;
if (scaledr < -2147483648.0) scaledr = -2147483648.0;
*optr++ = (s32_t)scaledl;
*optr++ = (s32_t)scaledr;
}
}
}
_buf_inc_readp(streambuf, bytes_read);
block_left -= bytes_read;
if (d->sample_bytes > bytes_read) {
d->sample_bytes -= bytes_read;
} else {
LOG_SQ_INFO("end of track samples");
block_left = 0;
d->sample_bytes = 0;
}
IF_DIRECT(
_buf_inc_writep(outputbuf, frames * BYTES_PER_FRAME);
);
IF_PROCESS(
process.in_frames += frames;
);
LOG_SQ_SDEBUG("write %u frames", frames);
}
// skip the other channel blocks
// the right channel has already been read and is guarenteed to be in streambuf so can be skipped immediately
if (d->channels > 1) {
_buf_inc_readp(streambuf, d->block_size);
}
if (d->channels > 2) {
d->consume = d->block_size * (d->channels - 2);
}
return DECODE_RUNNING;
}
static decode_state _decode_dsdiff(void) {
// samples in streambuf are interleaved on byte per channel
// we process as little as necessary per call and only need to handle frames wrapping round streambuf
unsigned bytes_per_frame, bytes_read;
frames_t out, frames, count;
u8_t *iptr;
u32_t *optr;
u8_t tmp[WRAP_BUF_SIZE];
unsigned bytes = min(_buf_used(streambuf), _buf_cont_read(streambuf));
IF_DIRECT(
out = min(_buf_space(outputbuf), _buf_cont_write(outputbuf)) / BYTES_PER_FRAME;
);
IF_PROCESS(
out = process.max_in_frames;
);
if (dop) {
bytes_per_frame = d->channels * 2;
} else {
bytes_per_frame = d->channels;
out = min(out, BLOCK);
}
frames = min(min(bytes, d->sample_bytes) / bytes_per_frame, out);
bytes_read = frames * bytes_per_frame;
iptr = (u8_t *)streambuf->readp;
IF_DIRECT(
optr = (u32_t *)outputbuf->writep;
);
IF_PROCESS(
optr = (u32_t *)process.inbuf;
);
// handle wrap around end of streambuf and partial dop frame at end of stream
if (!frames && bytes < bytes_per_frame) {
memset(tmp, 0x69, WRAP_BUF_SIZE); // 0x69 = dsd silence
memcpy(tmp, streambuf->readp, bytes);
if (_buf_used(streambuf) > bytes_per_frame) {
memcpy(tmp + bytes, streambuf->buf, bytes_per_frame - bytes);
bytes_read = bytes_per_frame;
} else {
bytes_read = bytes;
}
iptr = tmp;
frames = 1;
}
count = frames;
if (dop) {
if (d->channels == 1) {
while (count--) {
*(optr++) = *(iptr) << 16 | *(iptr+1) << 8;
*(optr++) = *(iptr) << 16 | *(iptr+1) << 8;
iptr += bytes_per_frame;
}
} else {
while (count--) {
*(optr++) = *(iptr ) << 16 | *(iptr + d->channels) << 8;
*(optr++) = *(iptr+1) << 16 | *(iptr + d->channels + 1) << 8;
iptr += bytes_per_frame;
}
}
} else {
if (d->channels == 1) {
float *iptrf = d->transfer[0];
dsd2pcm_translate(d->dsd2pcm_ctx[0], frames, iptr, 1, 0, iptrf, 1);
while (count--) {
double scaled = *iptrf++ * 0x7fffffff;
if (scaled > 2147483647.0) scaled = 2147483647.0;
if (scaled < -2147483648.0) scaled = -2147483648.0;
*optr++ = (s32_t)scaled;
*optr++ = (s32_t)scaled;
}
} else {
float *iptrfl = d->transfer[0];
float *iptrfr = d->transfer[1];
dsd2pcm_translate(d->dsd2pcm_ctx[0], frames, iptr, d->channels, 0, iptrfl, 1);
dsd2pcm_translate(d->dsd2pcm_ctx[1], frames, iptr + 1, d->channels, 0, iptrfr, 1);
while (count--) {
double scaledl = *iptrfl++ * 0x7fffffff;
double scaledr = *iptrfr++ * 0x7fffffff;
if (scaledl > 2147483647.0) scaledl = 2147483647.0;
if (scaledl < -2147483648.0) scaledl = -2147483648.0;
if (scaledr > 2147483647.0) scaledr = 2147483647.0;
if (scaledr < -2147483648.0) scaledr = -2147483648.0;
*optr++ = (s32_t)scaledl;
*optr++ = (s32_t)scaledr;
}
}
}
_buf_inc_readp(streambuf, bytes_read);
if (d->sample_bytes > bytes_read) {
d->sample_bytes -= bytes_read;
} else {
LOG_SQ_INFO("end of track samples");
d->sample_bytes = 0;
}
IF_DIRECT(
_buf_inc_writep(outputbuf, frames * BYTES_PER_FRAME);
);
IF_PROCESS(
process.in_frames = frames;
);
LOG_SQ_SDEBUG("write %u frames", frames);
return DECODE_RUNNING;
}
static decode_state dsd_decode(void) {
decode_state ret;
LOCK_S;
if ((stream.state <= DISCONNECT && !_buf_used(streambuf)) || (!decode.new_stream && d->sample_bytes == 0)) {
UNLOCK_S;
return DECODE_COMPLETE;
}
if (d->consume) {
unsigned consume = min(d->consume, min(_buf_used(streambuf), _buf_cont_read(streambuf)));
LOG_SQ_DEBUG("consume: %u of %u", consume, d->consume);
_buf_inc_readp(streambuf, consume);
d->consume -= consume;
if (d->consume) {
UNLOCK_S;
return DECODE_RUNNING;
}
}
if (decode.new_stream) {
int r = _read_header();
if (r < 1) {
UNLOCK_S;
return DECODE_ERROR;
}
if (r == 0) {
UNLOCK_S;
return DECODE_RUNNING;
}
// otherwise got to start of audio
LOCK_O;
LOG_SQ_INFO("setting track_start");
output.track_start = outputbuf->writep;
dop = output.has_dop;
if (dop && d->sample_rate / 16 > output.supported_rates[0]) {
LOG_SQ_INFO("DOP sample rate too high for device - converting to PCM");
dop = false;
}
if (dop) {
LOG_SQ_INFO("DOP output");
output.next_dop = true;
output.next_sample_rate = d->sample_rate / 16;
output.fade = FADE_INACTIVE;
} else {
LOG_SQ_INFO("DSD to PCM output");
output.next_dop = false;
output.next_sample_rate = decode_newstream(d->sample_rate / 8, output.supported_rates);
if (output.fade_mode) _checkfade(true);
}
decode.new_stream = false;
UNLOCK_O;
}
LOCK_O_direct;
switch (d->type) {
case DSF:
ret = _decode_dsf();
break;
case DSDIFF:
ret = _decode_dsdiff();
break;
default:
ret = DECODE_ERROR;
}
UNLOCK_O_direct;
UNLOCK_S;
return ret;
}
static void dsd_open(u8_t size, u8_t rate, u8_t chan, u8_t endianness) {
d->type = UNKNOWN;
if (!d->dsd2pcm_ctx[0]) {
d->dsd2pcm_ctx[0] = dsd2pcm_init();
d->dsd2pcm_ctx[1] = dsd2pcm_init();
} else {
dsd2pcm_reset(d->dsd2pcm_ctx[0]);
dsd2pcm_reset(d->dsd2pcm_ctx[1]);
}
if (!d->transfer[1]) {
d->transfer[0] = malloc(sizeof(float) * BLOCK);
d->transfer[1] = malloc(sizeof(float) * BLOCK);
}
}
static void dsd_close(void) {
if (d->dsd2pcm_ctx[0]) {
dsd2pcm_destroy(d->dsd2pcm_ctx[0]);
dsd2pcm_destroy(d->dsd2pcm_ctx[1]);
d->dsd2pcm_ctx[0] = NULL;
d->dsd2pcm_ctx[1] = NULL;
}
if (d->transfer[0]) {
free(d->transfer[0]);
free(d->transfer[1]);
d->transfer[0] = NULL;
d->transfer[1] = NULL;
}
}
struct codec *register_dsd(void) {
static struct codec ret = {
'd', // id
"dsf,dff", // types
BLOCK * 2, // min read
BLOCK_FRAMES,// min space
dsd_open, // open
dsd_close, // close
dsd_decode, // decode
};
d = malloc(sizeof(struct dsd));
if (!d) {
return NULL;
}
memset(d, 0, sizeof(struct dsd));
dsd2pcm_precalc();
LOG_SQ_INFO("using dsd to decode dsf,dff");
return &ret;
}
#endif // DSD
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