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/*
* Copyright (C) 2003-2012 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 "pcm_export.h"
#include "pcm_dsd_usb.h"
#include "pcm_pack.h"
#include "util/byte_reverse.h"
void
pcm_export_init(struct pcm_export_state *state)
{
pcm_buffer_init(&state->reverse_buffer);
pcm_buffer_init(&state->pack_buffer);
pcm_buffer_init(&state->dsd_buffer);
}
void pcm_export_deinit(struct pcm_export_state *state)
{
pcm_buffer_deinit(&state->reverse_buffer);
pcm_buffer_deinit(&state->pack_buffer);
pcm_buffer_deinit(&state->dsd_buffer);
}
void
pcm_export_open(struct pcm_export_state *state,
enum sample_format sample_format, unsigned channels,
bool dsd_usb, bool shift8, bool pack, bool reverse_endian)
{
assert(audio_valid_sample_format(sample_format));
assert(!dsd_usb || audio_valid_channel_count(channels));
state->channels = channels;
state->dsd_usb = dsd_usb && sample_format == SAMPLE_FORMAT_DSD;
if (state->dsd_usb)
/* after the conversion to DSD-over-USB, the DSD
samples are stuffed inside fake 24 bit samples */
sample_format = SAMPLE_FORMAT_S24_P32;
state->shift8 = shift8 && sample_format == SAMPLE_FORMAT_S24_P32;
state->pack24 = pack && (sample_format == SAMPLE_FORMAT_S24_P32 || sample_format == SAMPLE_FORMAT_DSD_OVER_USB);
assert(!state->shift8 || !state->pack24);
state->reverse_endian = 0;
if (reverse_endian) {
size_t sample_size = state->pack24
? 3
: sample_format_size(sample_format);
assert(sample_size <= 0xff);
if (sample_size > 1)
state->reverse_endian = sample_size;
}
}
const void *
pcm_export(struct pcm_export_state *state, const void *data, size_t size,
size_t *dest_size_r)
{
if (state->dsd_usb)
data = pcm_dsd_to_usb(&state->dsd_buffer, state->channels,
data, size, &size);
if (state->pack24) {
assert(size % 4 == 0);
const size_t num_samples = size / 4;
const size_t dest_size = num_samples * 3;
const uint8_t *src8 = data, *src_end8 = src8 + size;
uint8_t *dest = pcm_buffer_get(&state->pack_buffer, dest_size);
assert(dest != NULL);
pcm_pack_24(dest, (const int32_t *)src8,
(const int32_t *)src_end8);
data = dest;
size = dest_size;
} else if (state->shift8) {
assert(size % 4 == 0);
const uint8_t *src8 = data, *src_end8 = src8 + size;
const uint32_t *src = (const uint32_t *)src8;
const uint32_t *const src_end = (const uint32_t *)src_end8;
uint32_t *dest = pcm_buffer_get(&state->pack_buffer, size);
data = dest;
while (src < src_end)
*dest++ = *src++ << 8;
}
if (state->reverse_endian > 0) {
assert(state->reverse_endian >= 2);
void *dest = pcm_buffer_get(&state->reverse_buffer, size);
assert(dest != NULL);
const uint8_t *src = data, *src_end = src + size;
reverse_bytes(dest, src, src_end, state->reverse_endian);
data = dest;
}
*dest_size_r = size;
return data;
}
size_t
pcm_export_source_size(const struct pcm_export_state *state, size_t size)
{
if (state->dsd_usb)
/* DSD over USB doubles the transport size */
size /= 2;
return size;
}
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