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https://github.com/alsa-project/alsa-lib.git
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test: latency - add more realtime tests
Add '-x' and '-X' tests and '-U' - I/O update mode based on the system timing. It may be required to check the position updates for the specific hardware. Print the real time / stream time differences. Also include code to make valgrind happy (including the wrong memory llocation for the stream buffer). Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela
parent
425e4d1fbe
commit
3e4aeba25b
1 changed files with 151 additions and 12 deletions
163
test/latency.c
163
test/latency.c
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@ -33,10 +33,13 @@
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#include <sched.h>
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#include <errno.h>
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#include <getopt.h>
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#include <time.h>
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#include "../include/asoundlib.h"
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#include <sys/time.h>
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#include <math.h>
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typedef struct timespec timestamp_t;
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char *pdevice = "hw:0,0";
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char *cdevice = "hw:0,0";
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snd_pcm_format_t format = SND_PCM_FORMAT_S16_LE;
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@ -50,10 +53,40 @@ int loop_sec = 30; /* seconds */
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int block = 0; /* block mode */
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int use_poll = 0;
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int resample = 1;
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int sys_latency = 0; /* data I/O: use system timings instead driver wakeups */
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int pos_dump = 0; /* dump positions */
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int realtime_check = 0;
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unsigned long loop_limit;
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snd_pcm_uframes_t playback_buffer_size;
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snd_output_t *output = NULL;
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static inline long long frames_to_micro(size_t frames)
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{
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return (long long)((frames * 1000000LL) + (rate / 2)) / rate;
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}
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void timestamp_now(timestamp_t *tstamp)
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{
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if (clock_gettime(CLOCK_MONOTONIC_RAW, tstamp))
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printf("clock_gettime() failed\n");
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}
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long long timestamp_diff_micro(timestamp_t *tstamp)
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{
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timestamp_t now, diff;
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timestamp_now(&now);
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if (tstamp->tv_nsec > now.tv_nsec) {
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diff.tv_sec = now.tv_sec - tstamp->tv_sec - 1;
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diff.tv_nsec = (now.tv_nsec + 1000000000L) - tstamp->tv_nsec;
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} else {
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diff.tv_sec = now.tv_sec - tstamp->tv_sec;
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diff.tv_nsec = now.tv_nsec - tstamp->tv_nsec;
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}
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/* microseconds */
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return (diff.tv_sec * 1000000) + ((diff.tv_nsec + 500L) / 1000L);
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}
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int setparams_stream(snd_pcm_t *handle,
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snd_pcm_hw_params_t *params,
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const char *id)
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@ -96,6 +129,14 @@ int setparams_stream(snd_pcm_t *handle,
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printf("Rate doesn't match (requested %iHz, get %iHz)\n", rate, err);
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return -EINVAL;
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}
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/* we do not want driver wakeups */
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if (sys_latency > 0 && snd_pcm_hw_params_can_disable_period_wakeup(params)) {
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err = snd_pcm_hw_params_set_period_wakeup(handle, params, 0);
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if (err < 0) {
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printf("Cannot disable period wakeups for %s\n", id);
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return err;
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}
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}
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return 0;
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}
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@ -227,6 +268,7 @@ int setparams(snd_pcm_t *phandle, snd_pcm_t *chandle, int *bufsize)
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goto __again;
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snd_pcm_hw_params_get_buffer_size(p_params, &p_size);
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playback_buffer_size = p_size;
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if (p_psize * 2 < p_size) {
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snd_pcm_hw_params_get_periods_min(p_params, &val, NULL);
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if (val > 2) {
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@ -390,7 +432,7 @@ long writebuf(snd_pcm_t *handle, char *buf, long len, size_t *frames)
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}
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return 0;
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}
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#define FILTERSWEEP_LFO_CENTER 2000.
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#define FILTERSWEEP_LFO_DEPTH 1800.
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#define FILTERSWEEP_LFO_FREQ 0.2
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@ -434,6 +476,19 @@ void applyeffect(char* buffer,int r)
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}
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}
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static ssize_t get_avail(snd_pcm_t *pcm)
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{
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ssize_t avail;
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while (1) {
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avail = snd_pcm_avail(pcm);
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if (avail == -EAGAIN)
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continue;
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break;
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}
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return avail;
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}
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void help(void)
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{
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int k;
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@ -444,6 +499,7 @@ void help(void)
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"-C,--cdevice capture device\n"
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"-m,--min minimum latency in frames\n"
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"-M,--max maximum latency in frames\n"
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"-U,--updates I/O updates in milliseconds (0 = off)\n"
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"-F,--frames frames to transfer\n"
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"-f,--format sample format\n"
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"-c,--channels channels\n"
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@ -454,6 +510,8 @@ void help(void)
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"-b,--block block mode\n"
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"-p,--poll use poll (wait for event - reduces CPU usage)\n"
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"-e,--effect apply an effect (bandpass filter sweep)\n"
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"-x,--posdump dump buffer positions\n"
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"-X,--realtime do a realtime check (buffering)\n"
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);
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printf("Recognized sample formats are:");
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for (k = 0; k < SND_PCM_FORMAT_LAST; ++k) {
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@ -480,6 +538,7 @@ int main(int argc, char *argv[])
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{"cdevice", 1, NULL, 'C'},
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{"min", 1, NULL, 'm'},
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{"max", 1, NULL, 'M'},
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{"updates", 1, NULL, 'U'},
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{"frames", 1, NULL, 'F'},
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{"format", 1, NULL, 'f'},
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{"channels", 1, NULL, 'c'},
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@ -490,20 +549,23 @@ int main(int argc, char *argv[])
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{"block", 0, NULL, 'b'},
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{"poll", 0, NULL, 'p'},
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{"effect", 0, NULL, 'e'},
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{"posdump", 0, NULL, 'x'},
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{"realtime", 0, NULL, 'X'},
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{NULL, 0, NULL, 0},
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};
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snd_pcm_t *phandle, *chandle;
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char *buffer;
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int err, latency, morehelp;
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int ok;
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int ok, first_avail;
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snd_timestamp_t p_tstamp, c_tstamp;
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ssize_t r;
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ssize_t r, cap_avail, cap_avail_max, pbk_fill, pbk_fill_min;
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size_t frames_in, frames_out, in_max;
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timestamp_t tstamp_start;
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int effect = 0;
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morehelp = 0;
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while (1) {
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int c;
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if ((c = getopt_long(argc, argv, "hP:C:m:M:F:f:c:r:B:E:s:bpen", long_option, NULL)) < 0)
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if ((c = getopt_long(argc, argv, "hP:C:m:M:U:F:f:c:r:B:E:s:bpenxX", long_option, NULL)) < 0)
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break;
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switch (c) {
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case 'h':
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@ -525,6 +587,10 @@ int main(int argc, char *argv[])
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err = atoi(optarg) / 2;
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latency_max = latency_min > err ? latency_min : err;
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break;
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case 'U':
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err = atoi(optarg);
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sys_latency = err <= 0 ? 0 : err;
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break;
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case 'f':
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format = snd_pcm_format_value(optarg);
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if (format == SND_PCM_FORMAT_UNKNOWN) {
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@ -564,6 +630,12 @@ int main(int argc, char *argv[])
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case 'n':
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resample = 0;
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break;
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case 'x':
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pos_dump = 1;
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break;
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case 'X':
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realtime_check = 1;
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break;
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}
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}
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@ -579,15 +651,27 @@ int main(int argc, char *argv[])
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loop_limit = loop_sec * rate;
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latency = latency_min - 4;
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buffer = malloc((latency_max * snd_pcm_format_physical_width(format) / 8) * 2);
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buffer = malloc((latency_max * 2 * snd_pcm_format_physical_width(format) / 8) * channels);
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/* I/O updates based on a system timer */
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if (sys_latency > 0) {
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block = 0;
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use_poll = 0;
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}
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setscheduler();
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printf("Playback device is %s\n", pdevice);
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printf("Capture device is %s\n", cdevice);
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printf("Parameters are %iHz, %s, %i channels, %s mode\n", rate, snd_pcm_format_name(format), channels, block ? "blocking" : "non-blocking");
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printf("Poll mode: %s\n", use_poll ? "yes" : "no");
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printf("Loop limit is %lu frames, minimum latency = %i, maximum latency = %i\n", loop_limit, latency_min * 2, latency_max * 2);
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printf("Parameters are %iHz, %s, %i channels, %s mode, use poll %s\n",
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rate, snd_pcm_format_name(format),
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channels, block ? "blocking" : "non-blocking",
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use_poll ? "yes" : "no");
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printf("Loop limit is %lu frames, minimum latency = %i, maximum latency = %i",
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loop_limit, latency_min * 2, latency_max * 2);
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if (sys_latency > 0)
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printf(", I/O updates %ims", sys_latency);
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printf("\n");
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if ((err = snd_pcm_open(&phandle, pdevice, SND_PCM_STREAM_PLAYBACK, block ? 0 : SND_PCM_NONBLOCK)) < 0) {
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printf("Playback open error: %s\n", snd_strerror(err));
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@ -613,6 +697,9 @@ int main(int argc, char *argv[])
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y[1] = (float*) malloc(channels*sizeof(float));
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y[2] = (float*) malloc(channels*sizeof(float));
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}
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cap_avail_max = 0;
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pbk_fill_min = latency * 2;
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while (1) {
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frames_in = frames_out = 0;
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@ -623,7 +710,7 @@ int main(int argc, char *argv[])
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printf("Streams link error: %s\n", snd_strerror(err));
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exit(0);
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}
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if (snd_pcm_format_set_silence(format, buffer, latency*channels) < 0) {
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if (snd_pcm_format_set_silence(format, buffer, latency * channels) < 0) {
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fprintf(stderr, "silence error\n");
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break;
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}
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@ -640,6 +727,8 @@ int main(int argc, char *argv[])
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printf("Go error: %s\n", snd_strerror(err));
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exit(0);
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}
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if (realtime_check)
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timestamp_now(&tstamp_start);
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gettimestamp(phandle, &p_tstamp);
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gettimestamp(chandle, &c_tstamp);
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#if 0
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@ -651,16 +740,54 @@ int main(int argc, char *argv[])
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ok = 1;
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in_max = 0;
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first_avail = 1;
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while (ok && frames_in < loop_limit) {
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if (use_poll) {
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cap_avail = latency;
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if (sys_latency > 0) {
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poll(NULL, 0, sys_latency);
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cap_avail = get_avail(chandle);
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if (cap_avail < 0) {
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printf("Avail failed: %s\n", snd_strerror(cap_avail));
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ok = 0;
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break;
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}
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if (first_avail && realtime_check) {
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long long diff = timestamp_diff_micro(&tstamp_start);
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long long pos = frames_to_micro(cap_avail);
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printf("POS FIRST CHECK: c=%zd (rt=%lldus)\n", cap_avail, pos - diff);
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first_avail = 0;
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}
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} else if (use_poll) {
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/* use poll to wait for next event */
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snd_pcm_wait(chandle, 1000);
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}
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if ((r = readbuf(chandle, buffer, latency, &frames_in, &in_max)) < 0)
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if (pos_dump || realtime_check) {
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if (sys_latency <= 0)
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cap_avail = get_avail(chandle);
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pbk_fill = get_avail(phandle);
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if (pbk_fill >= 0)
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pbk_fill = playback_buffer_size - pbk_fill;
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if (cap_avail > cap_avail_max)
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cap_avail_max = cap_avail;
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if (pbk_fill >= 0 && pbk_fill < pbk_fill_min)
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pbk_fill_min = pbk_fill;
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if (realtime_check) {
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long long diff = timestamp_diff_micro(&tstamp_start);
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long long cap_pos = frames_to_micro(frames_in + cap_avail);
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long long pbk_pos = frames_to_micro(frames_out - pbk_fill);
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printf("POS: p=%zd (min=%zd, rt=%lldus) c=%zd (max=%zd, rt=%lldus)\n",
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pbk_fill, pbk_fill_min, pbk_pos - diff,
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cap_avail, cap_avail_max, cap_pos - diff);
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} else if (pos_dump) {
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printf("POS: p=%zd (min=%zd), c=%zd (max=%zd)\n",
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pbk_fill, pbk_fill_min, cap_avail, cap_avail_max);
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}
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}
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if ((r = readbuf(chandle, buffer, cap_avail, &frames_in, &in_max)) < 0)
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ok = 0;
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else {
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if (effect)
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applyeffect(buffer,r);
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applyeffect(buffer, r);
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if (writebuf(phandle, buffer, r, &frames_out) < 0)
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ok = 0;
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}
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@ -677,6 +804,13 @@ int main(int argc, char *argv[])
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if (p_tstamp.tv_sec == c_tstamp.tv_sec &&
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p_tstamp.tv_usec == c_tstamp.tv_usec)
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printf("Hardware sync\n");
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if (realtime_check) {
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long long diff = timestamp_diff_micro(&tstamp_start);
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long long mtime = frames_to_micro(frames_in);
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printf("Elapsed real time: %lldus\n", diff);
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printf("Elapsed device time: %lldus\n", mtime);
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printf("Test time diff (device - real): %lldus\n", mtime - diff);
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}
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snd_pcm_drop(chandle);
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snd_pcm_nonblock(phandle, 0);
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snd_pcm_drain(phandle);
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@ -698,5 +832,10 @@ int main(int argc, char *argv[])
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}
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snd_pcm_close(phandle);
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snd_pcm_close(chandle);
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snd_output_close(output);
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snd_config_update_free_global();
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free(buffer);
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free(pdevice);
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free(cdevice);
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return 0;
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}
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