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Ported to new API

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This commit is contained in:
Abramo Bagnara 2000-07-18 13:38:58 +00:00
parent 9059d26167
commit eee70747eb
1 changed files with 80 additions and 163 deletions
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241
test/latency.c
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@ -4,17 +4,17 @@
#include <sched.h> #include <sched.h>
#include <errno.h> #include <errno.h>
#include "../include/asoundlib.h" #include "../include/asoundlib.h"
#include <sys/time.h>
#if 0 #if 0
#define USE_FRAGMENT_MODE /* latency is twice more than for frame mode!!! */ #define USE_FRAGMENT_MODE /* latency is twice more than for frame mode!!! */
#endif #endif
#define USED_RATE 48000 //#define USED_RATE 48000
//#define LATENCY_MIN 8192 #define USED_RATE 22050
#define LATENCY_MIN 32 #define LATENCY_MIN 32
#define LATENCY_MAX 8192 /* in bytes */ #define LATENCY_MAX 2048 /* in frames */
//#define LOOP_LIMIT (8192UL * 2) #define LOOP_LIMIT (30UL * USED_RATE) /* 30 seconds */
#define LOOP_LIMIT (30 * 176400UL) /* 30 seconds */
#if 0 #if 0
static char *xitoa(int aaa) static char *xitoa(int aaa)
@ -26,39 +26,6 @@ static char *xitoa(int aaa)
} }
#endif #endif
static int syncro(snd_pcm_t *phandle, snd_pcm_t *chandle)
{
snd_pcm_stream_info_t pinfo, cinfo;
int err;
bzero(&pinfo, sizeof(pinfo));
bzero(&cinfo, sizeof(cinfo));
pinfo.stream = SND_PCM_STREAM_PLAYBACK;
cinfo.stream = SND_PCM_STREAM_CAPTURE;
if ((err = snd_pcm_stream_info(phandle, &pinfo)) < 0) {
printf("Playback info error: %s\n", snd_strerror(err));
exit(0);
}
if ((err = snd_pcm_stream_info(chandle, &cinfo)) < 0) {
printf("Capture info error: %s\n", snd_strerror(err));
exit(0);
}
if (pinfo.sync.id32[0] == 0 && pinfo.sync.id32[1] == 0 &&
pinfo.sync.id32[2] == 0 && pinfo.sync.id32[3] == 0)
return 0;
if (memcmp(&pinfo.sync, &cinfo.sync, sizeof(pinfo.sync)))
return 0;
return 1;
}
static void syncro_id(snd_pcm_sync_t *sync)
{
sync->id32[0] = 0; /* application */
sync->id32[1] = getpid();
sync->id32[2] = 0x89abcdef;
sync->id32[3] = 0xaaaaaaaa;
}
/* /*
* This small demo program can be used for measuring latency between * This small demo program can be used for measuring latency between
* capture and playback. This latency is measured from driver (diff when * capture and playback. This latency is measured from driver (diff when
@ -67,15 +34,14 @@ static void syncro_id(snd_pcm_sync_t *sync)
* Used format is 44100Hz, Signed Little Endian 16-bit, Stereo. * Used format is 44100Hz, Signed Little Endian 16-bit, Stereo.
*/ */
int setparams(snd_pcm_t *phandle, snd_pcm_t *chandle, int sync, int *queue) int setparams(snd_pcm_t *phandle, snd_pcm_t *chandle, int sync, int *bufsize)
{ {
int err, again; int err;
snd_pcm_stream_params_t params; snd_pcm_params_t params;
snd_pcm_stream_setup_t psetup, csetup; snd_pcm_setup_t psetup, csetup;
bzero(&params, sizeof(params)); bzero(&params, sizeof(params));
params.stream = SND_PCM_STREAM_PLAYBACK; #ifdef USE_FRAGMENT_MODE
#ifdef USE_BLOCK_MODE
params.mode = SND_PCM_MODE_FRAGMENT; params.mode = SND_PCM_MODE_FRAGMENT;
#else #else
params.mode = SND_PCM_MODE_FRAME; params.mode = SND_PCM_MODE_FRAME;
@ -87,107 +53,68 @@ int setparams(snd_pcm_t *phandle, snd_pcm_t *chandle, int sync, int *queue)
params.start_mode = SND_PCM_START_GO; params.start_mode = SND_PCM_START_GO;
params.xrun_mode = SND_PCM_XRUN_DRAIN; params.xrun_mode = SND_PCM_XRUN_DRAIN;
params.time = 1; params.time = 1;
*queue += 16; *bufsize += 4;
#if 0
params.buf.stream.fill = SND_PCM_FILL_SILENCE;
params.buf.stream.max_fill = 1024;
#else
params.buf.stream.fill = SND_PCM_FILL_NONE;
#endif
if (sync)
syncro_id(&params.sync);
__again: __again:
if (*queue > LATENCY_MAX) if (*bufsize > LATENCY_MAX)
return -1; return -1;
again = 0; params.frag_size = *bufsize / 2;
params.stream = SND_PCM_STREAM_PLAYBACK; params.frames_min = 1;
params.frag_size = *queue; params.buffer_size = *bufsize;
#ifdef USE_BLOCK_MODE
params.buffer_size = *queue * 2; if ((err = snd_pcm_params(phandle, &params)) < 0) {
params.buf.block.frags_min = 1;
#else
params.buffer_size = *queue;
params.buf.stream.bytes_min = 2;
#endif
if ((err = snd_pcm_stream_params(phandle, &params)) < 0) {
printf("Playback params error: %s\n", snd_strerror(err)); printf("Playback params error: %s\n", snd_strerror(err));
exit(0); exit(0);
} }
params.stream = SND_PCM_STREAM_CAPTURE; if ((err = snd_pcm_params(chandle, &params)) < 0) {
if ((err = snd_pcm_stream_params(chandle, &params)) < 0) {
printf("Capture params error: %s\n", snd_strerror(err)); printf("Capture params error: %s\n", snd_strerror(err));
exit(0); exit(0);
} }
bzero(&psetup, sizeof(psetup)); bzero(&psetup, sizeof(psetup));
psetup.stream = SND_PCM_STREAM_PLAYBACK; if ((err = snd_pcm_setup(phandle, &psetup)) < 0) {
if ((err = snd_pcm_stream_setup(phandle, &psetup)) < 0) {
printf("Playback setup error: %s\n", snd_strerror(err)); printf("Playback setup error: %s\n", snd_strerror(err));
exit(0); exit(0);
} }
bzero(&csetup, sizeof(csetup)); bzero(&csetup, sizeof(csetup));
csetup.stream = SND_PCM_STREAM_CAPTURE; if ((err = snd_pcm_setup(chandle, &csetup)) < 0) {
if ((err = snd_pcm_stream_setup(chandle, &csetup)) < 0) {
printf("Capture setup error: %s\n", snd_strerror(err)); printf("Capture setup error: %s\n", snd_strerror(err));
exit(0); exit(0);
} }
#ifdef USE_BLOCK_MODE if (psetup.buffer_size > *bufsize) {
if (psetup.buffer_size / 2 > *queue) { *bufsize = psetup.buffer_size;
*queue = psetup.buffer_size / 2;
again++;
}
#else
if (psetup.buffer_size > *queue) {
*queue = psetup.buffer_size;
again++;
}
#endif
if (again)
goto __again; goto __again;
if ((err = snd_pcm_playback_prepare(phandle)) < 0) { }
if ((err = snd_pcm_prepare(phandle)) < 0) {
printf("Playback prepare error: %s\n", snd_strerror(err)); printf("Playback prepare error: %s\n", snd_strerror(err));
exit(0); exit(0);
} }
if ((err = snd_pcm_capture_prepare(chandle)) < 0) { if ((err = snd_pcm_prepare(chandle)) < 0) {
printf("Capture prepare error: %s\n", snd_strerror(err)); printf("Capture prepare error: %s\n", snd_strerror(err));
exit(0); exit(0);
} }
printf("Trying latency %i (playback rate = %iHz, capture rate = %iHz)...\n", snd_pcm_dump(phandle, stdout);
#ifdef USE_BLOCK_MODE snd_pcm_dump(chandle, stdout);
*queue * 2, printf("Trying latency %i...\n", *bufsize);
#else
*queue,
#endif
psetup.format.rate, csetup.format.rate);
printf("Fragment boundary = %li/%li, Position boundary = %li/%li\n", (long)psetup.frag_boundary, (long)csetup.frag_boundary, (long)psetup.pos_boundary, (long)psetup.pos_boundary);
printf("Frags = %li/%li, Buffer size = %li/%li\n", (long)psetup.frags, (long)csetup.frags, (long)psetup.buffer_size, (long)csetup.buffer_size);
fflush(stdout); fflush(stdout);
return 0; return 0;
} }
void showstat(snd_pcm_t *handle, int stream, snd_pcm_stream_status_t *rstatus, size_t bytes) void showstat(snd_pcm_t *handle, snd_pcm_status_t *rstatus, size_t frames)
{ {
int err; int err;
snd_pcm_stream_status_t status; snd_pcm_status_t status;
char *str;
str = stream == SND_PCM_STREAM_CAPTURE ? "Capture" : "Playback";
bzero(&status, sizeof(status)); bzero(&status, sizeof(status));
status.stream = stream; if ((err = snd_pcm_status(handle, &status)) < 0) {
if ((err = snd_pcm_stream_status(handle, &status)) < 0) { printf("Stream status error: %s\n", snd_strerror(err));
printf("Stream %s status error: %s\n", str, snd_strerror(err));
exit(0); exit(0);
} }
printf("%s:\n", str); printf(" state = %i\n", status.state);
printf(" status = %i\n", status.status); printf(" frames = %i\n", frames);
printf(" bytes = %i\n", bytes); printf(" frame_io = %li\n", (long)status.frame_io);
printf(" frag_io = %li\n", (long)status.frag_io); printf(" frame_data = %li\n", (long)status.frame_data);
printf(" frag_data = %li\n", (long)status.frag_data); printf(" frames_avail = %li\n", (long)status.frames_avail);
printf(" frag_used = %li\n", (long)status.frags_used);
printf(" frag_free = %li\n", (long)status.frags_free);
printf(" pos_io = %li\n", (long)status.pos_io);
printf(" pos_data = %li\n", (long)status.pos_data);
printf(" bytes_used = %li\n", (long)status.bytes_used);
printf(" bytes_free = %li\n", (long)status.bytes_free);
if (rstatus) if (rstatus)
*rstatus = status; *rstatus = status;
} }
@ -223,7 +150,7 @@ long timediff(struct timeval t1, struct timeval t2)
return (t1.tv_sec * 1000000) + l; return (t1.tv_sec * 1000000) + l;
} }
long readbuf(snd_pcm_t *handle, char *buf, long len, size_t *bytes) long readbuf(snd_pcm_t *handle, char *buf, long len, size_t *frames)
{ {
long r; long r;
@ -231,29 +158,27 @@ long readbuf(snd_pcm_t *handle, char *buf, long len, size_t *bytes)
r = snd_pcm_read(handle, buf, len); r = snd_pcm_read(handle, buf, len);
} while (r == -EAGAIN); } while (r == -EAGAIN);
if (r > 0) if (r > 0)
*bytes += r; *frames += r;
// printf("read = %li\n", r); // printf("read = %li\n", r);
// showstat(handle, SND_PCM_STREAM_CAPTURE, NULL); // showstat(handle, NULL);
return r; return r;
} }
long writebuf(snd_pcm_t *handle, char *buf, long len, size_t *bytes) long writebuf(snd_pcm_t *handle, char *buf, long len, size_t *frames)
{ {
long r; long r;
while (len > 0) { while (len > 0) {
r = snd_pcm_write(handle, buf, len); r = snd_pcm_write(handle, buf, len);
#ifndef USE_BLOCK_MODE
if (r == -EAGAIN) if (r == -EAGAIN)
continue; continue;
#endif
// printf("write = %li\n", r); // printf("write = %li\n", r);
if (r < 0) if (r < 0)
return r; return r;
// showstat(handle, SND_PCM_STREAM_PLAYBACK, NULL); // showstat(handle, NULL);
buf += r; buf += r * 4;
len -= r; len -= r;
*bytes += r; *frames += r;
} }
return 0; return 0;
} }
@ -261,79 +186,71 @@ long writebuf(snd_pcm_t *handle, char *buf, long len, size_t *bytes)
int main(void) int main(void)
{ {
snd_pcm_t *phandle, *chandle; snd_pcm_t *phandle, *chandle;
char buffer[LATENCY_MAX]; /* max two fragments by 4096 bytes */ char buffer[LATENCY_MAX*4];
int pcard = 0, pdevice = 0; int pcard = 0, pdevice = 0;
int ccard = 0, cdevice = 0; int ccard = 0, cdevice = 0;
int err, latency = LATENCY_MIN - 16; int err, latency = LATENCY_MIN - 4;
int size, ok; int size, ok;
int sync; int sync;
snd_pcm_sync_t ssync; snd_pcm_status_t pstatus, cstatus;
snd_pcm_stream_status_t pstatus, cstatus;
ssize_t r; ssize_t r;
size_t bytes_in, bytes_out; size_t frames_in, frames_out;
snd_pcm_synchro_request_t sync_req[2];
setscheduler(); setscheduler();
if ((err = snd_pcm_plug_open(&phandle, pcard, pdevice, SND_PCM_OPEN_PLAYBACK|SND_PCM_NONBLOCK_PLAYBACK)) < 0) { if ((err = snd_pcm_plug_open(&phandle, pcard, pdevice, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)) < 0) {
printf("Playback open error: %s\n", snd_strerror(err)); printf("Playback open error: %s\n", snd_strerror(err));
return 0; return 0;
} }
if ((err = snd_pcm_plug_open(&chandle, ccard, cdevice, SND_PCM_OPEN_CAPTURE|SND_PCM_NONBLOCK_CAPTURE)) < 0) { if ((err = snd_pcm_plug_open(&chandle, ccard, cdevice, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK)) < 0) {
printf("Record open error: %s\n", snd_strerror(err)); printf("Record open error: %s\n", snd_strerror(err));
return 0; return 0;
} }
#ifdef USE_BLOCK_MODE memset(sync_req, 0, sizeof(sync_req));
sync_req[0].handle = phandle;
sync_req[0].result = -3;
sync_req[1].handle = chandle;
#ifdef USE_FRAGMENT_MODE
printf("Using fragment mode...\n"); printf("Using fragment mode...\n");
#else #else
printf("Using frame mode...\n"); printf("Using frame mode...\n");
#endif #endif
sync = syncro(phandle, chandle); printf("Loop limit is %li frames\n", LOOP_LIMIT);
if (sync)
printf("Using hardware synchronization mode\n");
printf("Loop limit is %li bytes\n", LOOP_LIMIT);
while (1) { while (1) {
bytes_in = bytes_out = 0; frames_in = frames_out = 0;
if (setparams(phandle, chandle, sync, &latency) < 0) if (setparams(phandle, chandle, sync, &latency) < 0)
break; break;
if (snd_pcm_format_set_silence(SND_PCM_SFMT_S16_LE, buffer, latency) < 0) { if (snd_pcm_format_set_silence(SND_PCM_SFMT_S16_LE, buffer, latency*2) < 0) {
fprintf(stderr, "silence error\n"); fprintf(stderr, "silence error\n");
break; break;
} }
if (writebuf(phandle, buffer, latency, &bytes_out) < 0) { if (writebuf(phandle, buffer, latency, &frames_out) < 0) {
fprintf(stderr, "write error\n"); fprintf(stderr, "write error\n");
break; break;
} }
#ifdef USE_BLOCK_MODE /* at least two fragments MUST BE filled !!! */
if (writebuf(phandle, buffer, latency, &bytes_out) < 0) if ((err = snd_pcm_synchro(SND_PCM_SYNCHRO_GO, 2, sync_req, SND_PCM_SYNC_MODE_NORMAL)) < 0) {
break; printf("Sync go error: %s\n", snd_strerror(err));
#endif exit(0);
if (sync) { }
syncro_id(&ssync); if (sync_req[0].tstamp.tv_sec == sync_req[1].tstamp.tv_sec &&
if ((err = snd_pcm_sync_go(phandle, &ssync)) < 0) { sync_req[0].tstamp.tv_usec == sync_req[1].tstamp.tv_usec) {
printf("Sync go error: %s\n", snd_strerror(err)); printf("Hardware sync\n");
exit(0);
}
} else {
if ((err = snd_pcm_capture_go(chandle)) < 0) {
printf("Capture go error: %s\n", snd_strerror(err));
exit(0);
}
if ((err = snd_pcm_playback_go(phandle)) < 0) {
printf("Playback go error: %s\n", snd_strerror(err));
exit(0);
}
} }
ok = 1; ok = 1;
size = 0; size = 0;
while (ok && bytes_in < LOOP_LIMIT) { while (ok && frames_in < LOOP_LIMIT) {
if ((r = readbuf(chandle, buffer, latency, &bytes_in)) < 0) if ((r = readbuf(chandle, buffer, latency, &frames_in)) < 0)
ok = 0; ok = 0;
if (r > 0 && writebuf(phandle, buffer, r, &bytes_out) < 0) else if (writebuf(phandle, buffer, r, &frames_out) < 0)
ok = 0; ok = 0;
} }
showstat(phandle, SND_PCM_STREAM_PLAYBACK, &pstatus, bytes_out); printf("Playback:\n");
showstat(chandle, SND_PCM_STREAM_CAPTURE, &cstatus, bytes_in); showstat(phandle, &pstatus, frames_out);
snd_pcm_capture_flush(chandle); printf("Capture:\n");
snd_pcm_playback_flush(phandle); showstat(chandle, &cstatus, frames_in);
snd_pcm_flush(chandle);
snd_pcm_flush(phandle);
if (ok) { if (ok) {
printf("Playback time = %li.%i, Record time = %li.%i, diff = %li\n", printf("Playback time = %li.%i, Record time = %li.%i, diff = %li\n",
pstatus.stime.tv_sec, pstatus.stime.tv_sec,