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foxbox/apps/plugins/pdbox/PDa/src/s_audio_alsa.c
Peter D'Hoye 526b5580da Cut the files in half and it might work better (note to self: check your tree is really clean before patching) 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21070 a1c6a512-1295-4272-9138-f99709370657
2009-05-24 21:28:16 +00:00

946 lines
28 KiB
C
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/* Copyright (c) 1997-2003 Guenter Geiger, Miller Puckette, Larry Troxler,
* Winfried Ritsch, Karl MacMillan, and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* this file inputs and outputs audio using the ALSA API available on linux. */
#include <alsa/asoundlib.h>
#include "m_pd.h"
#include "s_stuff.h"
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sched.h>
#include <sys/mman.h>
typedef int16_t t_alsa_sample16;
typedef int32_t t_alsa_sample32;
#define ALSA_SAMPLEWIDTH_16 sizeof(t_alsa_sample16)
#define ALSA_SAMPLEWIDTH_32 sizeof(t_alsa_sample32)
#define ALSA_XFERSIZE16 (signed int)(sizeof(t_alsa_sample16) * DEFDACBLKSIZE)
#define ALSA_XFERSIZE32 (signed int)(sizeof(t_alsa_sample32) * DEFDACBLKSIZE)
#define ALSA_MAXDEV 1
#define ALSA_JITTER 1024
#define ALSA_EXTRABUFFER 2048
#define ALSA_DEFFRAGSIZE 64
#define ALSA_DEFNFRAG 12
#ifndef INT32_MAX
#define INT32_MAX 0x7fffffff
#endif
#if (SND_LIB_MAJOR < 1)
#define ALSAAPI9
#endif
typedef struct _alsa_dev
{
snd_pcm_t *inhandle;
snd_pcm_t *outhandle;
int innoninterleave; /* true if we're set for noninterleaved read */
int outnoninterleave; /* same for write */
} t_alsa_dev;
t_alsa_dev alsa_device;
static void *alsa_snd_buf = 0;
static void **alsa_buf_ptrs;
static int alsa_samplewidth;
static snd_pcm_status_t* in_status;
static snd_pcm_status_t* out_status;
static int alsa_mode;
static int alsa_buf_samps; /* believed actual ALSA bufsize in sample frames */
static int alsa_inchannels;
static int alsa_outchannels;
/* Defines */
#define DEBUG(x) x
#define DEBUG2(x) {x;}
static void alsa_checkiosync( void);
static void alsa_numbertoname(int devno, char *devname, int nchar);
/* don't assume we can turn all 31 bits when doing float-to-fix;
otherwise some audio drivers (e.g. Midiman/ALSA) wrap around. */
#define FMAX 0x7ffff000
#define CLIP32(x) (((x)>FMAX)?FMAX:((x) < -FMAX)?-FMAX:(x))
/* support for ALSA pcmv2 api by Karl MacMillan<karlmac@peabody.jhu.edu> */
static void check_error(int err, const char *why)
{
if (err < 0)
fprintf(stderr, "%s: %s\n", why, snd_strerror(err));
}
/* was: alsa_open_audio(int wantinchans, int wantoutchans, int srate) */
int alsa_open_audio(int naudioindev, int *audioindev, int nchindev,
int *chindev, int naudiooutdev, int *audiooutdev, int nchoutdev,
int *choutdev, int rate)
{
int err, inchans = 0, outchans = 0, subunitdir;
char devname[512];
snd_pcm_hw_params_t* hw_params;
snd_pcm_sw_params_t* sw_params;
snd_output_t* out;
int frag_size = (sys_blocksize ? sys_blocksize : ALSA_DEFFRAGSIZE);
int nfrags, i;
short* tmp_buf;
unsigned int tmp_uint;
snd_pcm_uframes_t tmp_snd_pcm_uframes;
int wantinchans, wantoutchans, devno;
if (naudioindev >= 2 || naudiooutdev >= 2)
post("alsa: only one input and output device allowed (extras ignored");
if (naudioindev >= 1 && naudiooutdev >= 1 &&
audioindev[0] != audiooutdev[0])
post("alsa: changing output device to agree with input device");
if (nchindev)
wantinchans = chindev[0];
else wantinchans = (naudioindev ? 2 : 0);
if (nchoutdev)
wantoutchans = choutdev[0];
else wantoutchans = (naudiooutdev ? 2 : 0);
devno = (naudioindev > 0 ? audioindev[0] :
(naudiooutdev > 0 ? audiooutdev[0] : 0));
alsa_numbertoname(devno, devname, 512);
if (sys_verbose)
post("device name %s; channels in %d, out %d", devname, wantinchans,
wantoutchans);
nfrags = sys_schedadvance * (float)rate / (1e6 * frag_size);
/* save our belief as to ALSA's buffer size for later */
alsa_buf_samps = nfrags * frag_size;
if (sys_verbose)
post("audio buffer set to %d", (int)(0.001 * sys_schedadvance));
alsa_device.innoninterleave = alsa_device.outnoninterleave = 0;
if (wantinchans)
{
err = snd_pcm_open(&alsa_device.inhandle, devname,
SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK);
check_error(err, "snd_pcm_open (input)");
if (err < 0)
inchans = 0;
else
{
inchans = wantinchans;
snd_pcm_nonblock(alsa_device.inhandle, 1);
}
}
if (wantoutchans)
{
err = snd_pcm_open(&alsa_device.outhandle, devname,
SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
check_error(err, "snd_pcm_open (output)");
if (err < 0)
outchans = 0;
else
{
outchans = wantoutchans;
snd_pcm_nonblock(alsa_device.outhandle, 1);
}
}
if (inchans)
{
if (sys_verbose)
post("opening sound input...");
err = snd_pcm_hw_params_malloc(&hw_params);
check_error(err, "snd_pcm_hw_params_malloc (input)");
// get the default params
err = snd_pcm_hw_params_any(alsa_device.inhandle, hw_params);
check_error(err, "snd_pcm_hw_params_any (input)");
/* try to set interleaved access */
err = snd_pcm_hw_params_set_access(alsa_device.inhandle,
hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
if (err < 0)
{
/* OK, so try non-interleaved */
err = snd_pcm_hw_params_set_access(alsa_device.inhandle,
hw_params, SND_PCM_ACCESS_RW_NONINTERLEAVED);
if (err >= 0)
{
post("using non-interleaved audio input");
alsa_device.innoninterleave = 1;
}
}
check_error(err, "snd_pcm_hw_params_set_access (input)");
// Try to set 32 bit format first
err = snd_pcm_hw_params_set_format(alsa_device.inhandle, hw_params,
SND_PCM_FORMAT_S32);
if (err < 0)
{
/* fprintf(stderr,
"PD-ALSA: 32 bit format not available - using 16\n"); */
err = snd_pcm_hw_params_set_format(alsa_device.inhandle, hw_params,
SND_PCM_FORMAT_S16);
check_error(err, "snd_pcm_hw_params_set_format (input)");
alsa_samplewidth = 2;
}
else
{
alsa_samplewidth = 4;
}
post("Sample width set to %d bytes", alsa_samplewidth);
// set the subformat
err = snd_pcm_hw_params_set_subformat(alsa_device.inhandle, hw_params,
SND_PCM_SUBFORMAT_STD);
check_error(err, "snd_pcm_hw_params_set_subformat (input)");
// set the number of channels
tmp_uint = inchans;
err = snd_pcm_hw_params_set_channels_min(alsa_device.inhandle,
hw_params, &tmp_uint);
check_error(err, "snd_pcm_hw_params_set_channels (input)");
if (tmp_uint != (unsigned)inchans)
post("ALSA: set input channels to %d", tmp_uint);
inchans = tmp_uint;
// set the sampling rate
err = snd_pcm_hw_params_set_rate_min(alsa_device.inhandle, hw_params,
&rate, 0);
check_error(err, "snd_pcm_hw_params_set_rate_min (input)");
#if 0
err = snd_pcm_hw_params_get_rate(hw_params, &subunitdir);
post("input sample rate %d", err);
#endif
// set the period - ie frag size
// post("fragsize a %d", frag_size);
/* LATER try this to get a recommended period size...
right now, it trips an assertion failure in ALSA lib */
#if 0
post("input period was %d, min %d, max %d\n",
snd_pcm_hw_params_get_period_size(hw_params, 0),
snd_pcm_hw_params_get_period_size_min(hw_params, 0),
snd_pcm_hw_params_get_period_size_max(hw_params, 0));
#endif
#ifdef ALSAAPI9
err = snd_pcm_hw_params_set_period_size_near(alsa_device.inhandle,
hw_params,
(snd_pcm_uframes_t)
frag_size, 0);
#else
tmp_snd_pcm_uframes = frag_size;
err = snd_pcm_hw_params_set_period_size_near(alsa_device.inhandle,
hw_params, &tmp_snd_pcm_uframes, 0);
#endif
check_error(err, "snd_pcm_hw_params_set_period_size_near (input)");
// post("fragsize b %d", frag_size);
// set the number of periods - ie numfrags
// post("nfrags a %d", nfrags);
#ifdef ALSAAPI9
err = snd_pcm_hw_params_set_periods_near(alsa_device.inhandle,
hw_params, nfrags, 0);
#else
tmp_uint = nfrags;
err = snd_pcm_hw_params_set_periods_near(alsa_device.inhandle,
hw_params, &tmp_uint, 0);
#endif
check_error(err, "snd_pcm_hw_params_set_periods_near (input)");
// set the buffer size
#ifdef ALSAAPI9
err = snd_pcm_hw_params_set_buffer_size_near(alsa_device.inhandle,
hw_params, nfrags * frag_size);
#else
tmp_snd_pcm_uframes = nfrags * frag_size;
err = snd_pcm_hw_params_set_buffer_size_near(alsa_device.inhandle,
hw_params, &tmp_snd_pcm_uframes);
#endif
check_error(err, "snd_pcm_hw_params_set_buffer_size_near (input)");
err = snd_pcm_hw_params(alsa_device.inhandle, hw_params);
check_error(err, "snd_pcm_hw_params (input)");
snd_pcm_hw_params_free(hw_params);
err = snd_pcm_sw_params_malloc(&sw_params);
check_error(err, "snd_pcm_sw_params_malloc (input)");
err = snd_pcm_sw_params_current(alsa_device.inhandle, sw_params);
check_error(err, "snd_pcm_sw_params_current (input)");
err = snd_pcm_sw_params_set_start_threshold(alsa_device.inhandle,
sw_params, nfrags * frag_size);
check_error(err, "snd_pcm_sw_params_set_start_threshold (input)");
err = snd_pcm_sw_params_set_stop_threshold(alsa_device.inhandle,
sw_params, 0x7fffffff);
check_error(err, "snd_pcm_sw_params_set_stop_threshold (input)");
err = snd_pcm_sw_params_set_avail_min(alsa_device.inhandle, sw_params,
frag_size);
check_error(err, "snd_pcm_sw_params_set_avail_min (input)");
err = snd_pcm_sw_params(alsa_device.inhandle, sw_params);
check_error(err, "snd_pcm_sw_params (input)");
snd_pcm_sw_params_free(sw_params);
snd_output_stdio_attach(&out, stderr, 0);
#if 0
if (sys_verbose)
{
snd_pcm_dump_hw_setup(alsa_device.inhandle, out);
snd_pcm_dump_sw_setup(alsa_device.inhandle, out);
}
#endif
}
if (outchans)
{
int foo;
if (sys_verbose)
post("opening sound output...");
err = snd_pcm_hw_params_malloc(&hw_params);
check_error(err, "snd_pcm_sw_params (output)");
// get the default params
err = snd_pcm_hw_params_any(alsa_device.outhandle, hw_params);
check_error(err, "snd_pcm_hw_params_any (output)");
// set interleaved access - FIXME deal with other access types
err = snd_pcm_hw_params_set_access(alsa_device.outhandle, hw_params,
SND_PCM_ACCESS_RW_INTERLEAVED);
check_error(err, "snd_pcm_hw_params_set_access (output)");
/* try to set interleaved access */
err = snd_pcm_hw_params_set_access(alsa_device.outhandle,
hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
if (err < 0)
{
/* OK, so try non-interleaved */
err = snd_pcm_hw_params_set_access(alsa_device.outhandle,
hw_params, SND_PCM_ACCESS_RW_NONINTERLEAVED);
if (err >= 0)
{
post("using non-interleaved audio");
alsa_device.outnoninterleave = 1;
}
}
check_error(err, "snd_pcm_hw_params_set_access (output)");
// Try to set 32 bit format first
err = snd_pcm_hw_params_set_format(alsa_device.outhandle, hw_params,
SND_PCM_FORMAT_S32);
if (err < 0)
{
err = snd_pcm_hw_params_set_format(alsa_device.outhandle,
hw_params,SND_PCM_FORMAT_S16);
check_error(err, "snd_pcm_hw_params_set_format (output)");
/* fprintf(stderr,
"PD-ALSA: 32 bit format not available - using 16\n"); */
alsa_samplewidth = 2;
}
else
{
alsa_samplewidth = 4;
}
// set the subformat
err = snd_pcm_hw_params_set_subformat(alsa_device.outhandle, hw_params,
SND_PCM_SUBFORMAT_STD);
check_error(err, "snd_pcm_hw_params_set_subformat (output)");
// set the number of channels
tmp_uint = outchans;
err = snd_pcm_hw_params_set_channels_min(alsa_device.outhandle,
hw_params, &tmp_uint);
check_error(err, "snd_pcm_hw_params_set_channels (output)");
if (tmp_uint != (unsigned)outchans)
post("alsa: set output channels to %d", tmp_uint);
outchans = tmp_uint;
// set the sampling rate
err = snd_pcm_hw_params_set_rate_min(alsa_device.outhandle, hw_params,
&rate, 0);
check_error(err, "snd_pcm_hw_params_set_rate_min (output)");
#if 0
err = snd_pcm_hw_params_get_rate(hw_params, &subunitdir);
post("output sample rate %d", err);
#endif
// set the period - ie frag size
#if 0
post("output period was %d, min %d, max %d\n",
snd_pcm_hw_params_get_period_size(hw_params, 0),
snd_pcm_hw_params_get_period_size_min(hw_params, 0),
snd_pcm_hw_params_get_period_size_max(hw_params, 0));
#endif
// post("fragsize c %d", frag_size);
#ifdef ALSAAPI9
err = snd_pcm_hw_params_set_period_size_near(alsa_device.outhandle,
hw_params,
(snd_pcm_uframes_t)
frag_size, 0);
#else
tmp_snd_pcm_uframes = frag_size;
err = snd_pcm_hw_params_set_period_size_near(alsa_device.outhandle,
hw_params, &tmp_snd_pcm_uframes, 0);
#endif
// post("fragsize d %d", frag_size);
check_error(err, "snd_pcm_hw_params_set_period_size_near (output)");
// set the number of periods - ie numfrags
#ifdef ALSAAPI9
err = snd_pcm_hw_params_set_periods_near(alsa_device.outhandle,
hw_params, nfrags, 0);
#else
tmp_uint = nfrags;
err = snd_pcm_hw_params_set_periods_near(alsa_device.outhandle,
hw_params, &tmp_uint, 0);
#endif
check_error(err, "snd_pcm_hw_params_set_periods_near (output)");
// set the buffer size
#ifdef ALSAAPI9
err = snd_pcm_hw_params_set_buffer_size_near(alsa_device.outhandle,
hw_params, nfrags * frag_size);
#else
tmp_snd_pcm_uframes = nfrags * frag_size;
err = snd_pcm_hw_params_set_buffer_size_near(alsa_device.outhandle,
hw_params, &tmp_snd_pcm_uframes);
#endif
check_error(err, "snd_pcm_hw_params_set_buffer_size_near (output)");
err = snd_pcm_hw_params(alsa_device.outhandle, hw_params);
check_error(err, "snd_pcm_hw_params (output)");
snd_pcm_hw_params_free(hw_params);
err = snd_pcm_sw_params_malloc(&sw_params);
check_error(err, "snd_pcm_sw_params_malloc (output)");
err = snd_pcm_sw_params_current(alsa_device.outhandle, sw_params);
check_error(err, "snd_pcm_sw_params_current (output)");
err = snd_pcm_sw_params_set_start_threshold(alsa_device.outhandle,
sw_params, nfrags * frag_size);
check_error(err, "snd_pcm_sw_params_set_start_threshold (output)");
err = snd_pcm_sw_params_set_stop_threshold(alsa_device.outhandle,
sw_params, 0x7fffffff);
check_error(err, "snd_pcm_sw_params_set_stop_threshold (output)");
err = snd_pcm_sw_params_set_avail_min(alsa_device.outhandle, sw_params,
frag_size);
check_error(err, "snd_pcm_sw_params_set_avail_min (output)");
err = snd_pcm_sw_params(alsa_device.outhandle, sw_params);
check_error(err, "snd_pcm_sw_params (output)");
snd_pcm_sw_params_free(sw_params);
snd_output_stdio_attach(&out, stderr, 0);
#if 0
if (sys_verbose)
{
snd_pcm_dump_hw_setup(alsa_device.outhandle, out);
snd_pcm_dump_sw_setup(alsa_device.outhandle, out);
}
#endif
}
if (inchans)
snd_pcm_prepare(alsa_device.inhandle);
if (outchans)
snd_pcm_prepare(alsa_device.outhandle);
// if duplex we can link the channels so they start together
if (inchans && outchans)
snd_pcm_link(alsa_device.inhandle, alsa_device.outhandle);
// set up the status variables
err = snd_pcm_status_malloc(&in_status);
check_error(err, "snd_pcm_status_malloc");
err = snd_pcm_status_malloc(&out_status);
check_error(err, "snd_pcm_status_malloc");
// set up the buffer
if (alsa_snd_buf)
free(alsa_snd_buf);
alsa_snd_buf = (void *)malloc(
sizeof(char) * alsa_samplewidth * DEFDACBLKSIZE *
(outchans > inchans ? outchans : inchans));
memset(alsa_snd_buf, 0, sizeof(char) * alsa_samplewidth * DEFDACBLKSIZE *
(outchans > inchans ? outchans : inchans));
/* make an array of pointers too in case we need them */
if (alsa_buf_ptrs)
free(alsa_buf_ptrs);
alsa_buf_ptrs = (void **)malloc(
sizeof(void *) * (outchans > inchans ? outchans : inchans));
for (i = 0; i < (outchans > inchans ? outchans : inchans); i++)
alsa_buf_ptrs[i] = (t_alsa_sample32 *)alsa_snd_buf + i * DEFDACBLKSIZE;
// fill the buffer with silence
if (outchans)
{
i = (frag_size * nfrags)/DEFDACBLKSIZE + 1;
while (i--)
{
if (alsa_device.outnoninterleave)
snd_pcm_writen(alsa_device.outhandle, alsa_buf_ptrs,
DEFDACBLKSIZE);
else snd_pcm_writei(alsa_device.outhandle, alsa_snd_buf,
DEFDACBLKSIZE);
}
/* confused about this: */
/* if ((err = snd_pcm_start(alsa_device.outhandle) < 0))
check_error(err, "output start failed\n"); */
}
else if (inchans)
{
if (snd_pcm_start(alsa_device.inhandle) < 0)
check_error(err, "input start failed\n");
}
alsa_outchannels = outchans;
alsa_inchannels = inchans;
return (!(inchans || outchans));
}
void alsa_close_audio(void)
{
int err;
if (alsa_inchannels)
{
err = snd_pcm_close(alsa_device.inhandle);
check_error(err, "snd_pcm_close (input)");
}
if (alsa_outchannels)
{
err = snd_pcm_close(alsa_device.outhandle);
check_error(err, "snd_pcm_close (output)");
}
}
// #define DEBUG_ALSA_XFER
int alsa_send_dacs(void)
{
static int16_t *sp;
static int xferno = 0;
static int callno = 0;
static double timenow;
double timelast;
t_sample *fp, *fp1, *fp2;
int i, j, k, err, devno = 0;
int inputcount = 0, outputcount = 0, inputlate = 0, outputlate = 0;
int result;
int inchannels = (sys_inchannels > alsa_inchannels ?
alsa_inchannels : sys_inchannels);
int outchannels = (sys_outchannels > alsa_outchannels ?
alsa_outchannels : sys_outchannels);
unsigned int intransfersize = DEFDACBLKSIZE;
unsigned int outtransfersize = DEFDACBLKSIZE;
// get the status
if (!inchannels && !outchannels)
{
return SENDDACS_NO;
}
timelast = timenow;
timenow = sys_getrealtime();
#ifdef DEBUG_ALSA_XFER
if (timenow - timelast > 0.050)
fprintf(stderr, "(%d)",
(int)(1000 * (timenow - timelast))), fflush(stderr);
#endif
callno++;
alsa_checkiosync(); /* check I/O are in sync and data not late */
if (alsa_inchannels)
{
snd_pcm_status(alsa_device.inhandle, in_status);
if (snd_pcm_status_get_avail(in_status) < intransfersize)
return SENDDACS_NO;
}
if (alsa_outchannels)
{
snd_pcm_status(alsa_device.outhandle, out_status);
if (snd_pcm_status_get_avail(out_status) < outtransfersize)
return SENDDACS_NO;
}
/* do output */
if (alsa_outchannels)
{
fp = sys_soundout;
if (alsa_samplewidth == 4)
{
if (alsa_device.outnoninterleave)
{
int n = outchannels * DEFDACBLKSIZE;
for (i = 0, fp1 = fp; i < n; i++)
{
float s1 = *fp1 * INT32_MAX;
((t_alsa_sample32 *)alsa_snd_buf)[i] = CLIP32(s1);
}
n = alsa_outchannels * DEFDACBLKSIZE;
for (; i < n; i++)
((t_alsa_sample32 *)alsa_snd_buf)[i] = 0;
}
else
{
for (i = 0, fp1 = fp; i < outchannels; i++,
fp1 += DEFDACBLKSIZE)
{
for (j = i, k = DEFDACBLKSIZE, fp2 = fp1; k--;
j += alsa_outchannels, fp2++)
{
float s1 = *fp2 * INT32_MAX;
((t_alsa_sample32 *)alsa_snd_buf)[j] = CLIP32(s1);
}
}
}
}
else
{
for (i = 0, fp1 = fp; i < outchannels; i++, fp1 += DEFDACBLKSIZE)
{
for (j = i, k = DEFDACBLKSIZE, fp2 = fp1; k--;
j += alsa_outchannels, fp2++)
{
int s = *fp2 * 32767.;
if (s > 32767)
s = 32767;
else if (s < -32767)
s = -32767;
((t_alsa_sample16 *)alsa_snd_buf)[j] = s;
}
}
}
if (alsa_device.outnoninterleave)
result = snd_pcm_writen(alsa_device.outhandle, alsa_buf_ptrs,
outtransfersize);
else result = snd_pcm_writei(alsa_device.outhandle, alsa_snd_buf,
outtransfersize);
if (result != (int)outtransfersize)
{
#ifdef DEBUG_ALSA_XFER
if (result >= 0 || errno == EAGAIN)
fprintf(stderr, "ALSA: write returned %d of %d\n",
result, outtransfersize);
else fprintf(stderr, "ALSA: write: %s\n",
snd_strerror(errno));
fprintf(stderr,
"inputcount %d, outputcount %d, outbufsize %d\n",
inputcount, outputcount,
(ALSA_EXTRABUFFER + sys_advance_samples)
* alsa_samplewidth * outchannels);
#endif
sys_log_error(ERR_DACSLEPT);
return (SENDDACS_NO);
}
/* zero out the output buffer */
memset(sys_soundout, 0, DEFDACBLKSIZE * sizeof(*sys_soundout) *
sys_outchannels);
if (sys_getrealtime() - timenow > 0.002)
{
#ifdef DEBUG_ALSA_XFER
fprintf(stderr, "output %d took %d msec\n",
callno, (int)(1000 * (timenow - timelast))), fflush(stderr);
#endif
timenow = sys_getrealtime();
sys_log_error(ERR_DACSLEPT);
}
}
/* do input */
if (alsa_inchannels)
{
if (alsa_device.innoninterleave)
result = snd_pcm_readn(alsa_device.inhandle, alsa_buf_ptrs,
intransfersize);
else result = snd_pcm_readi(alsa_device.inhandle, alsa_snd_buf,
intransfersize);
if (result < (int)intransfersize)
{
#ifdef DEBUG_ALSA_XFER
if (result < 0)
fprintf(stderr,
"snd_pcm_read %d %d: %s\n",
callno, xferno, snd_strerror(errno));
else fprintf(stderr,
"snd_pcm_read %d %d returned only %d\n",
callno, xferno, result);
fprintf(stderr,
"inputcount %d, outputcount %d, inbufsize %d\n",
inputcount, outputcount,
(ALSA_EXTRABUFFER + sys_advance_samples)
* alsa_samplewidth * inchannels);
#endif
sys_log_error(ERR_ADCSLEPT);
return (SENDDACS_NO);
}
fp = sys_soundin;
if (alsa_samplewidth == 4)
{
if (alsa_device.innoninterleave)
{
int n = inchannels * DEFDACBLKSIZE;
for (i = 0, fp1 = fp; i < n; i++)
*fp1 = (float) ((t_alsa_sample32 *)alsa_snd_buf)[i]
* (1./ INT32_MAX);
}
else
{
for (i = 0, fp1 = fp; i < inchannels;
i++, fp1 += DEFDACBLKSIZE)
{
for (j = i, k = DEFDACBLKSIZE, fp2 = fp1; k--;
j += alsa_inchannels, fp2++)
*fp2 = (float) ((t_alsa_sample32 *)alsa_snd_buf)[j]
* (1./ INT32_MAX);
}
}
}
else
{
for (i = 0, fp1 = fp; i < inchannels; i++, fp1 += DEFDACBLKSIZE)
{
for (j = i, k = DEFDACBLKSIZE, fp2 = fp1; k--;
j += alsa_inchannels, fp2++)
*fp2 = (float) ((t_alsa_sample16 *)alsa_snd_buf)[j]
* 3.051850e-05;
}
}
}
xferno++;
if (sys_getrealtime() - timenow > 0.002)
{
#ifdef DEBUG_ALSA_XFER
fprintf(stderr, "routine took %d msec\n",
(int)(1000 * (sys_getrealtime() - timenow)));
#endif
sys_log_error(ERR_ADCSLEPT);
}
return SENDDACS_YES;
}
void alsa_printstate( void)
{
int i, result;
snd_pcm_sframes_t indelay, outdelay;
if (sys_audioapi != API_ALSA)
{
error("restart-audio: implemented for ALSA only.");
return;
}
if (sys_inchannels)
{
result = snd_pcm_delay(alsa_device.inhandle, &indelay);
if (result < 0)
post("snd_pcm_delay 1 failed");
else post("in delay %d", indelay);
}
if (sys_outchannels)
{
result = snd_pcm_delay(alsa_device.outhandle, &outdelay);
if (result < 0)
post("snd_pcm_delay 2 failed");
else post("out delay %d", outdelay);
}
post("sum %d (%d mod 64)\n", indelay + outdelay, (indelay+outdelay)%64);
post("buf samples %d", alsa_buf_samps);
}
void alsa_resync( void)
{
int i, result;
if (sys_audioapi != API_ALSA)
{
error("restart-audio: implemented for ALSA only.");
return;
}
memset(alsa_snd_buf, 0,
sizeof(char) * alsa_samplewidth * DEFDACBLKSIZE * sys_outchannels);
for (i = 0; i < 1000000; i++)
{
if (alsa_device.outnoninterleave)
result = snd_pcm_writen(alsa_device.outhandle, alsa_buf_ptrs,
DEFDACBLKSIZE);
else result = snd_pcm_writei(alsa_device.outhandle, alsa_snd_buf,
DEFDACBLKSIZE);
if (result != (int)DEFDACBLKSIZE)
break;
}
post("%d written", i);
}
void alsa_putzeros(int n)
{
int i, result;
memset(alsa_snd_buf, 0,
sizeof(char) * alsa_samplewidth * DEFDACBLKSIZE * alsa_outchannels);
for (i = 0; i < n; i++)
{
if (alsa_device.outnoninterleave)
result = snd_pcm_writen(alsa_device.outhandle, alsa_buf_ptrs,
DEFDACBLKSIZE);
else result = snd_pcm_writei(alsa_device.outhandle, alsa_snd_buf,
DEFDACBLKSIZE);
#if 0
if (result != DEFDACBLKSIZE)
post("result %d", result);
#endif
}
/* post ("putzeros %d", n); */
}
void alsa_getzeros(int n)
{
int i, result;
for (i = 0; i < n; i++)
{
result = snd_pcm_readi(alsa_device.inhandle, alsa_snd_buf,
DEFDACBLKSIZE);
#if 0
if (result != DEFDACBLKSIZE)
post("result %d", result);
#endif
}
/* post ("getzeros %d", n); */
}
/* call this only if both input and output are open */
static void alsa_checkiosync( void)
{
int i, result, checkit = 1, giveup = 1000, alreadylogged = 0;
snd_pcm_sframes_t indelay, outdelay, defect;
if (!(alsa_outchannels && alsa_inchannels))
return;
while (checkit)
{
checkit = 0;
if (giveup-- <= 0)
return;
result = snd_pcm_delay(alsa_device.outhandle, &outdelay);
if (result < 0)
{
post("output snd_pcm_delay failed: %s", snd_strerror(result));
if (snd_pcm_status(alsa_device.outhandle, out_status) < 0)
post("output snd_pcm_status failed");
else post("astate %d",
snd_pcm_status_get_state(out_status));
return;
}
if (outdelay < 0)
sys_log_error(ERR_DATALATE), alreadylogged = 1;
if (sys_inchannels)
{
result = snd_pcm_delay(alsa_device.inhandle, &indelay);
if (result < 0)
{
post("input snd_pcm_delay failed");
return;
}
defect = indelay + outdelay - alsa_buf_samps;
if (defect < -(3 * DEFDACBLKSIZE / 2) )
{
checkit = 1;
alsa_putzeros(1);
if (!alreadylogged)
sys_log_error(ERR_RESYNC), alreadylogged = 1;
}
else if (defect > 0)
{
checkit = 1;
alsa_getzeros(1);
if (!alreadylogged)
sys_log_error(ERR_RESYNC), alreadylogged = 1;
}
/* if (alreadylogged)
post("in %d out %d defect %d", indelay, outdelay, defect); */
}
}
}
static int alsa_nnames = 0;
static char **alsa_names = 0;
void alsa_adddev(char *name)
{
if (alsa_nnames)
alsa_names = (char **)t_resizebytes(alsa_names,
alsa_nnames * sizeof(char *),
(alsa_nnames+1) * sizeof(char *));
else alsa_names = (char **)t_getbytes(sizeof(char *));
alsa_names[alsa_nnames] = gensym(name)->s_name;
alsa_nnames++;
}
static void alsa_numbertoname(int devno, char *devname, int nchar)
{
int ndev = 0, cardno = -1;
while (!snd_card_next(&cardno) && cardno >= 0)
ndev++;
if (devno < 2*ndev)
{
if (devno & 1)
snprintf(devname, nchar, "plughw:%d", devno/2);
else snprintf(devname, nchar, "hw:%d", devno/2);
}
else if (devno <2*ndev + alsa_nnames)
snprintf(devname, nchar, "%s", alsa_names[devno - 2*ndev]);
else snprintf(devname, nchar, "???");
}
/* For each hardware card found, we list two devices, the "hard" and
"plug" one. The card scan is derived from portaudio code. */
void alsa_getdevs(char *indevlist, int *nindevs,
char *outdevlist, int *noutdevs, int *canmulti,
int maxndev, int devdescsize)
{
int ndev = 0, cardno = -1, i, j;
*canmulti = 0; /* only one device; must be the same for input&output */
while (!snd_card_next(&cardno) && cardno >= 0)
{
snd_ctl_t *ctl;
snd_ctl_card_info_t *info;
char devname[80];
const char *desc;
if (2 * ndev + 2 > maxndev)
break;
/* apparently, "cardno" is just a counter; but check that here */
if (ndev != cardno)
fprintf(stderr, "oops: ALSA cards not reported in order?\n");
sprintf(devname, "hw:%d", cardno );
/* fprintf(stderr, "\ntry %s...\n", devname); */
if (snd_ctl_open(&ctl, devname, 0) >= 0)
{
snd_ctl_card_info_malloc(&info);
snd_ctl_card_info(ctl, info);
desc = snd_ctl_card_info_get_name(info);
snd_ctl_card_info_free(info);
}
else
{
fprintf(stderr, "ALSA card scan error\n");
desc = "???";
}
/* fprintf(stderr, "name: %s\n", snd_ctl_card_info_get_name(info)); */
sprintf(indevlist + 2*ndev * devdescsize, "%s (hardware)", desc);
sprintf(indevlist + (2*ndev + 1) * devdescsize, "%s (plug-in)", desc);
sprintf(outdevlist + 2*ndev * devdescsize, "%s (hardware)", desc);
sprintf(outdevlist + (2*ndev + 1) * devdescsize, "%s (plug-in)", desc);
ndev++;
}
for (i = 0, j = 2*ndev; i < alsa_nnames; i++, j++)
{
if (j >= maxndev)
break;
snprintf(indevlist + j * devdescsize, devdescsize, "%s",
alsa_names[i]);
}
*nindevs = *noutdevs = j;
}
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