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rockbox/firmware/target/hosted/pcm-alsa.c
Amaury Pouly dd82f13fa1 nwz/alsa: various improvements 
Also audiohw driver to specific device name, rewrite alsa controls code to
cache more data, thus making the code easier and use less stack. Avoid using
short/long in pcm alsa code since it's the wrong size on 64-bit (simulator
for example)

Change-Id: Ibc1ec44396e37b6cbdedbcf37300878638e5d2d3
2020-10-31 14:16:31 +00:00

859 lines
24 KiB
C
Raw Blame History

/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Copyright (C) 2010 Thomas Martitz
* Copyright (c) 2020 Solomon Peachy
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
/*
* Based, but heavily modified, on the example given at
* http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2pcm_8c-example.html
*
* This driver uses the so-called unsafe async callback method.
*
* To make the async callback safer, an alternative stack is installed, since
* it's run from a signal hanlder (which otherwise uses the user stack).
*
* TODO: Rewrite this to properly use multithreading and/or direct mmap()
*/
#include "autoconf.h"
#include <stdlib.h>
#include <stdbool.h>
#include <alsa/asoundlib.h>
//#define LOGF_ENABLE
#include "system.h"
#include "debug.h"
#include "kernel.h"
#include "panic.h"
#include "pcm.h"
#include "pcm-internal.h"
#include "pcm_mixer.h"
#include "pcm_sampr.h"
#include "audiohw.h"
#include "pcm-alsa.h"
#include "logf.h"
#include <pthread.h>
#include <signal.h>
/* plughw:0,0 works with both, however "default" is recommended.
* default doesnt seem to work with async callback but doesn't break
* with multple applications running */
#define DEFAULT_PLAYBACK_DEVICE "plughw:0,0"
#define DEFAULT_CAPTURE_DEVICE "default"
static const snd_pcm_access_t access_ = SND_PCM_ACCESS_RW_INTERLEAVED; /* access mode */
#if defined(SONY_NWZ_LINUX) || defined(HAVE_FIIO_LINUX_CODEC)
/* Sony NWZ must use 32-bit per sample */
static const snd_pcm_format_t format = SND_PCM_FORMAT_S32_LE; /* sample format */
typedef int32_t sample_t;
#else
static const snd_pcm_format_t format = SND_PCM_FORMAT_S16; /* sample format */
typedef int16_t sample_t;
#endif
static const int channels = 2; /* count of channels */
static unsigned int real_sample_rate;
static unsigned int last_sample_rate;
static snd_pcm_t *handle = NULL;
static snd_pcm_sframes_t buffer_size;
static snd_pcm_sframes_t period_size;
static sample_t *frames = NULL;
static const void *pcm_data = 0;
static size_t pcm_size = 0;
static snd_async_handler_t *ahandler = NULL;
static pthread_mutex_t pcm_mtx;
static char signal_stack[SIGSTKSZ];
static const char *playback_dev = DEFAULT_PLAYBACK_DEVICE;
#ifdef HAVE_RECORDING
static void *pcm_data_rec = DEFAULT_CAPTURE_DEVICE;
static const char *capture_dev = NULL;
static snd_pcm_stream_t current_alsa_mode; /* SND_PCM_STREAM_PLAYBACK / _CAPTURE */
#endif
static const char *current_alsa_device;
void pcm_alsa_set_playback_device(const char *device)
{
playback_dev = device;
}
#ifdef HAVE_RECORDING
void pcm_alsa_set_capture_device(const char *device)
{
capture_dev = device;
}
#endif
static int set_hwparams(snd_pcm_t *handle)
{
int err;
unsigned int srate;
snd_pcm_hw_params_t *params;
snd_pcm_hw_params_malloc(&params);
/* Size playback buffers based on sample rate.
Note these are in FRAMES, and are sized to be about 10ms
for the buffer and 2.5ms for the period */
if (pcm_sampr > SAMPR_96) {
buffer_size = MIX_FRAME_SAMPLES * 16 * 4; /* 32k */
period_size = MIX_FRAME_SAMPLES * 4 * 4; /* 4k */
} else if (pcm_sampr > SAMPR_48) {
buffer_size = MIX_FRAME_SAMPLES * 16 * 2; /* 16k */
period_size = MIX_FRAME_SAMPLES * 4 * 2; /* 2k */
} else {
buffer_size = MIX_FRAME_SAMPLES * 16; /* 4k */
period_size = MIX_FRAME_SAMPLES * 4; /* 1k */
}
/* choose all parameters */
err = snd_pcm_hw_params_any(handle, params);
if (err < 0)
{
panicf("Broken configuration for playback: no configurations available: %s", snd_strerror(err));
goto error;
}
/* set the interleaved read/write format */
err = snd_pcm_hw_params_set_access(handle, params, access_);
if (err < 0)
{
panicf("Access type not available for playback: %s", snd_strerror(err));
goto error;
}
/* set the sample format */
err = snd_pcm_hw_params_set_format(handle, params, format);
if (err < 0)
{
logf("Sample format not available for playback: %s", snd_strerror(err));
goto error;
}
/* set the count of channels */
err = snd_pcm_hw_params_set_channels(handle, params, channels);
if (err < 0)
{
logf("Channels count (%i) not available for playbacks: %s", channels, snd_strerror(err));
goto error;
}
/* set the stream rate */
srate = pcm_sampr;
err = snd_pcm_hw_params_set_rate_near(handle, params, &srate, 0);
if (err < 0)
{
logf("Rate %luHz not available for playback: %s", pcm_sampr, snd_strerror(err));
goto error;
}
real_sample_rate = srate;
if (real_sample_rate != pcm_sampr)
{
logf("Rate doesn't match (requested %luHz, get %dHz)", pcm_sampr, real_sample_rate);
err = -EINVAL;
goto error;
}
/* set the buffer size */
err = snd_pcm_hw_params_set_buffer_size_near(handle, params, &buffer_size);
if (err < 0)
{
logf("Unable to set buffer size %ld for playback: %s", buffer_size, snd_strerror(err));
goto error;
}
/* set the period size */
err = snd_pcm_hw_params_set_period_size_near (handle, params, &period_size, NULL);
if (err < 0)
{
logf("Unable to set period size %ld for playback: %s", period_size, snd_strerror(err));
goto error;
}
if (frames) free(frames);
frames = calloc(1, period_size * channels * sizeof(sample_t));
/* write the parameters to device */
err = snd_pcm_hw_params(handle, params);
if (err < 0)
{
logf("Unable to set hw params for playback: %s", snd_strerror(err));
goto error;
}
err = 0; /* success */
error:
snd_pcm_hw_params_free(params);
return err;
}
/* Set sw params: playback start threshold and low buffer watermark */
static int set_swparams(snd_pcm_t *handle)
{
int err;
snd_pcm_sw_params_t *swparams;
snd_pcm_sw_params_malloc(&swparams);
/* get the current swparams */
err = snd_pcm_sw_params_current(handle, swparams);
if (err < 0)
{
logf("Unable to determine current swparams for playback: %s", snd_strerror(err));
goto error;
}
/* start the transfer when the buffer is half full */
err = snd_pcm_sw_params_set_start_threshold(handle, swparams, buffer_size / 2);
if (err < 0)
{
logf("Unable to set start threshold mode for playback: %s", snd_strerror(err));
goto error;
}
/* allow the transfer when at least period_size samples can be processed */
err = snd_pcm_sw_params_set_avail_min(handle, swparams, period_size);
if (err < 0)
{
logf("Unable to set avail min for playback: %s", snd_strerror(err));
goto error;
}
/* write the parameters to the playback device */
err = snd_pcm_sw_params(handle, swparams);
if (err < 0)
{
logf("Unable to set sw params for playback: %s", snd_strerror(err));
goto error;
}
err = 0; /* success */
error:
snd_pcm_sw_params_free(swparams);
return err;
}
/* Digital volume explanation:
* with very good approximation (<0.1dB) the convertion from dB to multiplicative
* factor, for dB>=0, is 2^(dB/3). We can then notice that if we write dB=3*k+r
* then this is 2^k*2^(r/3) so we only need to look at r=0,1,2. For r=0 this is
* 1, for r=1 we have 2^(1/3)~=1.25 so we approximate by 1+1/4, and 2^(2/3)~=1.5
* so we approximate by 1+1/2. To go from negative to nonnegative we notice that
* 48 dB => 63095 factor ~= 2^16 so we virtually pre-multiply everything by 2^(-16)
* and add 48dB to the input volume. We cannot go lower -43dB because several
* values between -48dB and -43dB would require a fractional multiplier, which is
* stupid to implement for such very low volume. */
static int dig_vol_mult_l = 2 << 16; /* multiplicative factor to apply to each sample */
static int dig_vol_mult_r = 2 << 16; /* multiplicative factor to apply to each sample */
void pcm_set_mixer_volume(int vol_db_l, int vol_db_r)
{
if(vol_db_l > 0 || vol_db_r > 0 || vol_db_l < -43 || vol_db_r < -43)
panicf("invalid pcm alsa volume");
if(format != SND_PCM_FORMAT_S32_LE)
panicf("this function assumes 32-bit sample size");
vol_db_l += 48; /* -42dB .. 0dB => 5dB .. 48dB */
vol_db_r += 48; /* -42dB .. 0dB => 5dB .. 48dB */
/* NOTE if vol_dB = 5 then vol_shift = 1 but r = 1 so we do vol_shift - 1 >= 0
* otherwise vol_dB >= 0 implies vol_shift >= 2 so vol_shift - 2 >= 0 */
int vol_shift_l = vol_db_l / 3;
int vol_shift_r = vol_db_r / 3;
int r_l = vol_db_l % 3;
int r_r = vol_db_r % 3;
if(r_l == 0)
dig_vol_mult_l = 1 << vol_shift_l;
else if(r_l == 1)
dig_vol_mult_l = 1 << vol_shift_l | 1 << (vol_shift_l - 2);
else
dig_vol_mult_l = 1 << vol_shift_l | 1 << (vol_shift_l - 1);
logf("l: %d dB -> factor = %d", vol_db_l - 48, dig_vol_mult_l);
if(r_r == 0)
dig_vol_mult_r = 1 << vol_shift_r;
else if(r_r == 1)
dig_vol_mult_r = 1 << vol_shift_r | 1 << (vol_shift_r - 2);
else
dig_vol_mult_r = 1 << vol_shift_r | 1 << (vol_shift_r - 1);
logf("r: %d dB -> factor = %d", vol_db_r - 48, dig_vol_mult_r);
}
/* copy pcm samples to a spare buffer, suitable for snd_pcm_writei() */
static bool copy_frames(bool first)
{
ssize_t nframes, frames_left = period_size;
bool new_buffer = false;
while (frames_left > 0)
{
if (!pcm_size)
{
new_buffer = true;
#ifdef HAVE_RECORDING
switch (current_alsa_mode)
{
case SND_PCM_STREAM_PLAYBACK:
#endif
if (!pcm_play_dma_complete_callback(PCM_DMAST_OK, &pcm_data, &pcm_size))
{
return false;
}
#ifdef HAVE_RECORDING
break;
case SND_PCM_STREAM_CAPTURE:
if (!pcm_play_dma_complete_callback(PCM_DMAST_OK, &pcm_data, &pcm_size))
{
return false;
}
break;
default:
break;
}
#endif
}
/* Note: This assumes stereo 16-bit */
if (pcm_size % 4)
panicf("Wrong pcm_size");
/* the compiler will optimize this test away */
nframes = MIN((ssize_t)pcm_size/4, frames_left);
if (format == SND_PCM_FORMAT_S32_LE)
{
/* We have to convert 16-bit to 32-bit, the need to multiply the
* sample by some value so the sound is not too low */
const int16_t *pcm_ptr = pcm_data;
sample_t *sample_ptr = &frames[2*(period_size-frames_left)];
for (int i = 0; i < nframes; i++)
{
*sample_ptr++ = *pcm_ptr++ * dig_vol_mult_l;
*sample_ptr++ = *pcm_ptr++ * dig_vol_mult_r;
}
}
else
{
#ifdef HAVE_RECORDING
switch (current_alsa_mode)
{
case SND_PCM_STREAM_PLAYBACK:
#endif
/* Rockbox and PCM have same format: memcopy */
memcpy(&frames[2*(period_size-frames_left)], pcm_data, nframes * 4);
#ifdef HAVE_RECORDING
break;
case SND_PCM_STREAM_CAPTURE:
memcpy(pcm_data_rec, &frames[2*(period_size-frames_left)], nframes * 4);
break;
default:
break;
}
#endif
}
pcm_data += nframes*4;
pcm_size -= nframes*4;
frames_left -= nframes;
if (new_buffer && !first)
{
new_buffer = false;
#ifdef HAVE_RECORDING
switch (current_alsa_mode)
{
case SND_PCM_STREAM_PLAYBACK:
#endif
pcm_play_dma_status_callback(PCM_DMAST_STARTED);
#ifdef HAVE_RECORDING
break;
case SND_PCM_STREAM_CAPTURE:
pcm_rec_dma_status_callback(PCM_DMAST_STARTED);
break;
default:
break;
}
#endif
}
}
return true;
}
static void async_callback(snd_async_handler_t *ahandler)
{
int err;
if (!ahandler) return;
snd_pcm_t *handle = snd_async_handler_get_pcm(ahandler);
if (!handle) return;
if (pthread_mutex_trylock(&pcm_mtx) != 0)
return;
snd_pcm_state_t state = snd_pcm_state(handle);
if (state == SND_PCM_STATE_XRUN)
{
logf("underrun!");
err = snd_pcm_recover(handle, -EPIPE, 0);
if (err < 0) {
logf("XRUN Recovery error: %s", snd_strerror(err));
goto abort;
}
}
else if (state == SND_PCM_STATE_DRAINING)
{
logf("draining...");
goto abort;
}
else if (state == SND_PCM_STATE_SETUP)
{
goto abort;
}
#ifdef HAVE_RECORDING
if (current_alsa_mode == SND_PCM_STREAM_PLAYBACK)
{
#endif
while (snd_pcm_avail_update(handle) >= period_size)
{
if (copy_frames(false))
{
err = snd_pcm_writei(handle, frames, period_size);
if (err < 0 && err != period_size && err != -EAGAIN)
{
logf("Write error: written %i expected %li", err, period_size);
break;
}
}
else
{
logf("%s: No Data (%d).", __func__, state);
break;
}
}
#ifdef HAVE_RECORDING
}
else if (current_alsa_mode == SND_PCM_STREAM_CAPTURE)
{
while (snd_pcm_avail_update(handle) >= period_size)
{
int err = snd_pcm_readi(handle, frames, period_size);
if (err < 0 && err != period_size && err != -EAGAIN)
{
logf("Read error: read %i expected %li", err, period_size);
break;
}
/* start the fake DMA transfer */
if (!copy_frames(false))
{
/* do not spam logf */
/* logf("%s: No Data.", __func__); */
break;
}
}
}
#endif
if (snd_pcm_state(handle) == SND_PCM_STATE_PREPARED)
{
err = snd_pcm_start(handle);
if (err < 0) {
logf("cb start error: %s", snd_strerror(err));
/* Depending on the error we might be SOL */
}
}
abort:
pthread_mutex_unlock(&pcm_mtx);
}
static void close_hwdev(void)
{
logf("closedev (%p)", handle);
if (handle) {
snd_pcm_drain(handle);
#ifdef AUDIOHW_MUTE_ON_STOP
audiohw_mute(true);
#endif
if (ahandler) {
snd_async_del_handler(ahandler);
ahandler = NULL;
}
snd_pcm_close(handle);
handle = NULL;
}
current_alsa_device = NULL;
#ifdef HAVE_RECORDING
pcm_data_rec = NULL;
#endif
}
static void alsadev_cleanup(void)
{
free(frames);
frames = NULL;
close_hwdev();
}
static void open_hwdev(const char *device, snd_pcm_stream_t mode)
{
int err;
logf("opendev %s (%p)", device, handle);
if (handle && device == current_alsa_device
#ifdef HAVE_RECORDING
&& current_alsa_mode == mode
#endif
)
{
return;
}
/* Close old handle */
close_hwdev();
if ((err = snd_pcm_open(&handle, device, mode, 0)) < 0)
{
panicf("%s(): Cannot open device %s: %s", __func__, device, snd_strerror(err));
}
last_sample_rate = 0;
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&pcm_mtx, &attr);
/* assign alternative stack for the signal handlers */
stack_t ss = {
.ss_sp = signal_stack,
.ss_size = sizeof(signal_stack),
.ss_flags = 0
};
struct sigaction sa;
err = sigaltstack(&ss, NULL);
if (err < 0)
{
panicf("Unable to install alternative signal stack: %s", strerror(err));
}
err = snd_async_add_pcm_handler(&ahandler, handle, async_callback, NULL);
if (err < 0)
{
panicf("Unable to register async handler: %s", snd_strerror(err));
}
/* only modify the stack the handler runs on */
sigaction(SIGIO, NULL, &sa);
sa.sa_flags |= SA_ONSTACK;
err = sigaction(SIGIO, &sa, NULL);
if (err < 0)
{
panicf("Unable to install alternative signal stack: %s", strerror(err));
}
#ifdef HAVE_RECORDING
current_alsa_mode = mode;
#else
(void)mode;
#endif
current_alsa_device = device;
atexit(alsadev_cleanup);
}
void pcm_play_dma_init(void)
{
logf("PCM DMA Init");
audiohw_preinit();
open_hwdev(playback_dev, SND_PCM_STREAM_PLAYBACK);
return;
}
void pcm_play_lock(void)
{
pthread_mutex_lock(&pcm_mtx);
}
void pcm_play_unlock(void)
{
pthread_mutex_unlock(&pcm_mtx);
}
static void pcm_dma_apply_settings_nolock(void)
{
logf("PCM DMA Settings %d %lu", last_sample_rate, pcm_sampr);
if (last_sample_rate != pcm_sampr)
{
last_sample_rate = pcm_sampr;
#ifdef AUDIOHW_MUTE_ON_SRATE_CHANGE
audiohw_mute(true);
#endif
snd_pcm_drop(handle);
set_hwparams(handle); // FIXME: check return code?
set_swparams(handle); // FIXME: check return code?
#if defined(HAVE_NWZ_LINUX_CODEC)
/* Sony NWZ linux driver uses a nonstandard mecanism to set the sampling rate */
audiohw_set_frequency(pcm_sampr);
#endif
/* (Will be unmuted by pcm resuming) */
}
}
void pcm_dma_apply_settings(void)
{
pcm_play_lock();
pcm_dma_apply_settings_nolock();
pcm_play_unlock();
}
void pcm_play_dma_stop(void)
{
logf("PCM DMA stop (%d)", snd_pcm_state(handle));
int err = snd_pcm_drain(handle);
if (err < 0)
if (err < 0)
logf("Drain failed: %s", snd_strerror(err));
#ifdef AUDIOHW_MUTE_ON_STOP
audiohw_mute(true);
#endif
}
void pcm_play_dma_start(const void *addr, size_t size)
{
logf("PCM DMA start (%p %d)", addr, size);
pcm_dma_apply_settings_nolock();
pcm_data = addr;
pcm_size = size;
#if !defined(AUDIOHW_MUTE_ON_STOP) && defined(AUDIOHW_MUTE_ON_SRATE_CHANGE)
audiohw_mute(false);
#endif
while (1)
{
snd_pcm_state_t state = snd_pcm_state(handle);
logf("PCM State %d", state);
switch (state)
{
case SND_PCM_STATE_RUNNING:
#if defined(AUDIOHW_MUTE_ON_STOP)
audiohw_mute(false);
#endif
return;
case SND_PCM_STATE_XRUN:
{
logf("Trying to recover from underrun");
int err = snd_pcm_recover(handle, -EPIPE, 0);
if (err < 0)
logf("Recovery failed: %s", snd_strerror(err));
continue;
}
case SND_PCM_STATE_SETUP:
{
int err = snd_pcm_prepare(handle);
if (err < 0)
logf("Prepare error: %s", snd_strerror(err));
}
/* fall through */
case SND_PCM_STATE_PREPARED:
{
int err;
#if 0
/* fill buffer with silence to initiate playback without noisy click */
snd_pcm_sframes_t sample_size = buffer_size;
sample_t *samples = calloc(1, sample_size * channels * sizeof(sample_t));
snd_pcm_format_set_silence(format, samples, sample_size);
err = snd_pcm_writei(handle, samples, sample_size);
free(samples);
if (err != (ssize_t)sample_size)
{
logf("Initial write error: written %i expected %li", err, sample_size);
return;
}
#else
/* Fill buffer with proper sample data */
while (snd_pcm_avail_update(handle) >= period_size)
{
if (copy_frames(true))
{
err = snd_pcm_writei(handle, frames, period_size);
if (err < 0 && err != period_size && err != -EAGAIN)
{
logf("Write error: written %i expected %li", err, period_size);
break;
}
}
}
#endif
err = snd_pcm_start(handle);
if (err < 0) {
logf("start error: %s", snd_strerror(err));
/* We will recover on the next iteration */
}
break;
}
case SND_PCM_STATE_DRAINING:
/* run until drained */
continue;
default:
logf("Unhandled state: %s", snd_pcm_state_name(state));
return;
}
}
}
size_t pcm_get_bytes_waiting(void)
{
return pcm_size;
}
const void * pcm_play_dma_get_peak_buffer(int *count)
{
uintptr_t addr = (uintptr_t)pcm_data;
*count = pcm_size / 4;
return (void *)((addr + 3) & ~3);
}
void pcm_play_dma_postinit(void)
{
audiohw_postinit();
#ifdef AUDIOHW_NEEDS_INITIAL_UNMUTE
audiohw_mute(false);
#endif
}
int pcm_alsa_get_rate(void)
{
return real_sample_rate;
}
#ifdef HAVE_RECORDING
void pcm_rec_lock(void)
{
pcm_play_lock();
}
void pcm_rec_unlock(void)
{
pcm_play_unlock();
}
void pcm_rec_dma_init(void)
{
logf("PCM REC DMA Init");
open_hwdev(capture_dev, SND_PCM_STREAM_CAPTURE);
}
void pcm_rec_dma_close(void)
{
logf("Rec DMA Close");
// close_hwdev();
open_hwdev(playback_dev, SND_PCM_STREAM_PLAYBACK);
}
void pcm_rec_dma_start(void *start, size_t size)
{
logf("PCM REC DMA start (%p %d)", start, size);
pcm_dma_apply_settings_nolock();
pcm_data_rec = start;
pcm_size = size;
if (!handle) return;
while (1)
{
snd_pcm_state_t state = snd_pcm_state(handle);
switch (state)
{
case SND_PCM_STATE_RUNNING:
return;
case SND_PCM_STATE_XRUN:
{
logf("Trying to recover from error");
int err = snd_pcm_recover(handle, -EPIPE, 0);
if (err < 0)
panicf("Recovery failed: %s", snd_strerror(err));
continue;
}
case SND_PCM_STATE_SETUP:
{
int err = snd_pcm_prepare(handle);
if (err < 0)
panicf("Prepare error: %s", snd_strerror(err));
}
/* fall through */
case SND_PCM_STATE_PREPARED:
{
int err = snd_pcm_start(handle);
if (err < 0)
panicf("Start error: %s", snd_strerror(err));
return;
}
case SND_PCM_STATE_DRAINING:
/* run until drained */
continue;
default:
logf("Unhandled state: %s", snd_pcm_state_name(state));
return;
}
}
}
void pcm_rec_dma_stop(void)
{
logf("Rec DMA Stop");
close_hwdev();
}
const void * pcm_rec_dma_get_peak_buffer(void)
{
uintptr_t addr = (uintptr_t)pcm_data_rec;
return (void*)((addr + 3) & ~3);
}
#ifdef SIMULATOR
void audiohw_set_recvol(int left, int right, int type)
{
(void)left;
(void)right;
(void)type;
}
#endif
#endif /* HAVE_RECORDING */
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