mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-10-29 05:40:25 -04:00
Ported to new API
This commit is contained in:
Abramo Bagnara
parent
9059d26167
commit
eee70747eb
1 changed files with 80 additions and 163 deletions
235
test/latency.c
235
test/latency.c
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@ -4,17 +4,17 @@
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#include <sched.h>
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#include <errno.h>
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#include "../include/asoundlib.h"
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#include <sys/time.h>
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#if 0
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#define USE_FRAGMENT_MODE /* latency is twice more than for frame mode!!! */
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#endif
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#define USED_RATE 48000
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//#define LATENCY_MIN 8192
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//#define USED_RATE 48000
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#define USED_RATE 22050
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#define LATENCY_MIN 32
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#define LATENCY_MAX 8192 /* in bytes */
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//#define LOOP_LIMIT (8192UL * 2)
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#define LOOP_LIMIT (30 * 176400UL) /* 30 seconds */
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#define LATENCY_MAX 2048 /* in frames */
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#define LOOP_LIMIT (30UL * USED_RATE) /* 30 seconds */
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#if 0
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static char *xitoa(int aaa)
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@ -26,39 +26,6 @@ static char *xitoa(int aaa)
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}
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#endif
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static int syncro(snd_pcm_t *phandle, snd_pcm_t *chandle)
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{
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snd_pcm_stream_info_t pinfo, cinfo;
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int err;
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bzero(&pinfo, sizeof(pinfo));
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bzero(&cinfo, sizeof(cinfo));
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pinfo.stream = SND_PCM_STREAM_PLAYBACK;
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cinfo.stream = SND_PCM_STREAM_CAPTURE;
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if ((err = snd_pcm_stream_info(phandle, &pinfo)) < 0) {
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printf("Playback info error: %s\n", snd_strerror(err));
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exit(0);
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}
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if ((err = snd_pcm_stream_info(chandle, &cinfo)) < 0) {
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printf("Capture info error: %s\n", snd_strerror(err));
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exit(0);
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}
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if (pinfo.sync.id32[0] == 0 && pinfo.sync.id32[1] == 0 &&
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pinfo.sync.id32[2] == 0 && pinfo.sync.id32[3] == 0)
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return 0;
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if (memcmp(&pinfo.sync, &cinfo.sync, sizeof(pinfo.sync)))
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return 0;
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return 1;
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}
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static void syncro_id(snd_pcm_sync_t *sync)
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{
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sync->id32[0] = 0; /* application */
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sync->id32[1] = getpid();
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sync->id32[2] = 0x89abcdef;
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sync->id32[3] = 0xaaaaaaaa;
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}
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/*
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* This small demo program can be used for measuring latency between
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* capture and playback. This latency is measured from driver (diff when
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@ -67,15 +34,14 @@ static void syncro_id(snd_pcm_sync_t *sync)
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* Used format is 44100Hz, Signed Little Endian 16-bit, Stereo.
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*/
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int setparams(snd_pcm_t *phandle, snd_pcm_t *chandle, int sync, int *queue)
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int setparams(snd_pcm_t *phandle, snd_pcm_t *chandle, int sync, int *bufsize)
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{
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int err, again;
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snd_pcm_stream_params_t params;
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snd_pcm_stream_setup_t psetup, csetup;
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int err;
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snd_pcm_params_t params;
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snd_pcm_setup_t psetup, csetup;
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bzero(¶ms, sizeof(params));
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params.stream = SND_PCM_STREAM_PLAYBACK;
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#ifdef USE_BLOCK_MODE
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#ifdef USE_FRAGMENT_MODE
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params.mode = SND_PCM_MODE_FRAGMENT;
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#else
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params.mode = SND_PCM_MODE_FRAME;
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@ -87,107 +53,68 @@ int setparams(snd_pcm_t *phandle, snd_pcm_t *chandle, int sync, int *queue)
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params.start_mode = SND_PCM_START_GO;
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params.xrun_mode = SND_PCM_XRUN_DRAIN;
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params.time = 1;
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*queue += 16;
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#if 0
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params.buf.stream.fill = SND_PCM_FILL_SILENCE;
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params.buf.stream.max_fill = 1024;
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#else
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params.buf.stream.fill = SND_PCM_FILL_NONE;
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#endif
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if (sync)
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syncro_id(¶ms.sync);
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*bufsize += 4;
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__again:
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if (*queue > LATENCY_MAX)
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if (*bufsize > LATENCY_MAX)
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return -1;
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again = 0;
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params.stream = SND_PCM_STREAM_PLAYBACK;
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params.frag_size = *queue;
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#ifdef USE_BLOCK_MODE
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params.buffer_size = *queue * 2;
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params.buf.block.frags_min = 1;
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#else
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params.buffer_size = *queue;
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params.buf.stream.bytes_min = 2;
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#endif
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if ((err = snd_pcm_stream_params(phandle, ¶ms)) < 0) {
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params.frag_size = *bufsize / 2;
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params.frames_min = 1;
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params.buffer_size = *bufsize;
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if ((err = snd_pcm_params(phandle, ¶ms)) < 0) {
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printf("Playback params error: %s\n", snd_strerror(err));
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exit(0);
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}
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params.stream = SND_PCM_STREAM_CAPTURE;
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if ((err = snd_pcm_stream_params(chandle, ¶ms)) < 0) {
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if ((err = snd_pcm_params(chandle, ¶ms)) < 0) {
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printf("Capture params error: %s\n", snd_strerror(err));
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exit(0);
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}
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bzero(&psetup, sizeof(psetup));
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psetup.stream = SND_PCM_STREAM_PLAYBACK;
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if ((err = snd_pcm_stream_setup(phandle, &psetup)) < 0) {
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if ((err = snd_pcm_setup(phandle, &psetup)) < 0) {
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printf("Playback setup error: %s\n", snd_strerror(err));
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exit(0);
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}
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bzero(&csetup, sizeof(csetup));
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csetup.stream = SND_PCM_STREAM_CAPTURE;
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if ((err = snd_pcm_stream_setup(chandle, &csetup)) < 0) {
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if ((err = snd_pcm_setup(chandle, &csetup)) < 0) {
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printf("Capture setup error: %s\n", snd_strerror(err));
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exit(0);
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}
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#ifdef USE_BLOCK_MODE
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if (psetup.buffer_size / 2 > *queue) {
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*queue = psetup.buffer_size / 2;
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again++;
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}
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#else
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if (psetup.buffer_size > *queue) {
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*queue = psetup.buffer_size;
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again++;
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}
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#endif
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if (again)
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if (psetup.buffer_size > *bufsize) {
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*bufsize = psetup.buffer_size;
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goto __again;
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if ((err = snd_pcm_playback_prepare(phandle)) < 0) {
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}
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if ((err = snd_pcm_prepare(phandle)) < 0) {
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printf("Playback prepare error: %s\n", snd_strerror(err));
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exit(0);
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}
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if ((err = snd_pcm_capture_prepare(chandle)) < 0) {
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if ((err = snd_pcm_prepare(chandle)) < 0) {
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printf("Capture prepare error: %s\n", snd_strerror(err));
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exit(0);
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}
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printf("Trying latency %i (playback rate = %iHz, capture rate = %iHz)...\n",
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#ifdef USE_BLOCK_MODE
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*queue * 2,
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#else
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*queue,
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#endif
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psetup.format.rate, csetup.format.rate);
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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);
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printf("Frags = %li/%li, Buffer size = %li/%li\n", (long)psetup.frags, (long)csetup.frags, (long)psetup.buffer_size, (long)csetup.buffer_size);
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snd_pcm_dump(phandle, stdout);
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snd_pcm_dump(chandle, stdout);
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printf("Trying latency %i...\n", *bufsize);
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fflush(stdout);
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return 0;
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}
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void showstat(snd_pcm_t *handle, int stream, snd_pcm_stream_status_t *rstatus, size_t bytes)
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void showstat(snd_pcm_t *handle, snd_pcm_status_t *rstatus, size_t frames)
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{
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int err;
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snd_pcm_stream_status_t status;
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char *str;
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snd_pcm_status_t status;
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str = stream == SND_PCM_STREAM_CAPTURE ? "Capture" : "Playback";
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bzero(&status, sizeof(status));
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status.stream = stream;
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if ((err = snd_pcm_stream_status(handle, &status)) < 0) {
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printf("Stream %s status error: %s\n", str, snd_strerror(err));
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if ((err = snd_pcm_status(handle, &status)) < 0) {
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printf("Stream status error: %s\n", snd_strerror(err));
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exit(0);
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}
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printf("%s:\n", str);
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printf(" status = %i\n", status.status);
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printf(" bytes = %i\n", bytes);
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printf(" frag_io = %li\n", (long)status.frag_io);
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printf(" frag_data = %li\n", (long)status.frag_data);
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printf(" frag_used = %li\n", (long)status.frags_used);
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printf(" frag_free = %li\n", (long)status.frags_free);
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printf(" pos_io = %li\n", (long)status.pos_io);
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printf(" pos_data = %li\n", (long)status.pos_data);
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printf(" bytes_used = %li\n", (long)status.bytes_used);
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printf(" bytes_free = %li\n", (long)status.bytes_free);
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printf(" state = %i\n", status.state);
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printf(" frames = %i\n", frames);
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printf(" frame_io = %li\n", (long)status.frame_io);
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printf(" frame_data = %li\n", (long)status.frame_data);
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printf(" frames_avail = %li\n", (long)status.frames_avail);
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if (rstatus)
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*rstatus = status;
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}
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@ -223,7 +150,7 @@ long timediff(struct timeval t1, struct timeval t2)
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return (t1.tv_sec * 1000000) + l;
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}
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long readbuf(snd_pcm_t *handle, char *buf, long len, size_t *bytes)
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long readbuf(snd_pcm_t *handle, char *buf, long len, size_t *frames)
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{
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long r;
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@ -231,29 +158,27 @@ long readbuf(snd_pcm_t *handle, char *buf, long len, size_t *bytes)
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r = snd_pcm_read(handle, buf, len);
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} while (r == -EAGAIN);
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if (r > 0)
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*bytes += r;
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*frames += r;
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// printf("read = %li\n", r);
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// showstat(handle, SND_PCM_STREAM_CAPTURE, NULL);
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// showstat(handle, NULL);
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return r;
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}
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long writebuf(snd_pcm_t *handle, char *buf, long len, size_t *bytes)
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long writebuf(snd_pcm_t *handle, char *buf, long len, size_t *frames)
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{
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long r;
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while (len > 0) {
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r = snd_pcm_write(handle, buf, len);
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#ifndef USE_BLOCK_MODE
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if (r == -EAGAIN)
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continue;
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#endif
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// printf("write = %li\n", r);
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if (r < 0)
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return r;
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// showstat(handle, SND_PCM_STREAM_PLAYBACK, NULL);
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buf += r;
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// showstat(handle, NULL);
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buf += r * 4;
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len -= r;
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*bytes += r;
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*frames += r;
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}
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return 0;
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}
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@ -261,79 +186,71 @@ long writebuf(snd_pcm_t *handle, char *buf, long len, size_t *bytes)
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int main(void)
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{
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snd_pcm_t *phandle, *chandle;
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char buffer[LATENCY_MAX]; /* max two fragments by 4096 bytes */
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char buffer[LATENCY_MAX*4];
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int pcard = 0, pdevice = 0;
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int ccard = 0, cdevice = 0;
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int err, latency = LATENCY_MIN - 16;
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int err, latency = LATENCY_MIN - 4;
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int size, ok;
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int sync;
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snd_pcm_sync_t ssync;
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snd_pcm_stream_status_t pstatus, cstatus;
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snd_pcm_status_t pstatus, cstatus;
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ssize_t r;
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size_t bytes_in, bytes_out;
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size_t frames_in, frames_out;
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snd_pcm_synchro_request_t sync_req[2];
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setscheduler();
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if ((err = snd_pcm_plug_open(&phandle, pcard, pdevice, SND_PCM_OPEN_PLAYBACK|SND_PCM_NONBLOCK_PLAYBACK)) < 0) {
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if ((err = snd_pcm_plug_open(&phandle, pcard, pdevice, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)) < 0) {
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printf("Playback open error: %s\n", snd_strerror(err));
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return 0;
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}
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if ((err = snd_pcm_plug_open(&chandle, ccard, cdevice, SND_PCM_OPEN_CAPTURE|SND_PCM_NONBLOCK_CAPTURE)) < 0) {
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if ((err = snd_pcm_plug_open(&chandle, ccard, cdevice, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK)) < 0) {
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printf("Record open error: %s\n", snd_strerror(err));
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return 0;
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}
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#ifdef USE_BLOCK_MODE
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memset(sync_req, 0, sizeof(sync_req));
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sync_req[0].handle = phandle;
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sync_req[0].result = -3;
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sync_req[1].handle = chandle;
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#ifdef USE_FRAGMENT_MODE
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printf("Using fragment mode...\n");
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#else
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printf("Using frame mode...\n");
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#endif
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sync = syncro(phandle, chandle);
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if (sync)
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printf("Using hardware synchronization mode\n");
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printf("Loop limit is %li bytes\n", LOOP_LIMIT);
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printf("Loop limit is %li frames\n", LOOP_LIMIT);
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while (1) {
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bytes_in = bytes_out = 0;
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frames_in = frames_out = 0;
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if (setparams(phandle, chandle, sync, &latency) < 0)
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break;
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if (snd_pcm_format_set_silence(SND_PCM_SFMT_S16_LE, buffer, latency) < 0) {
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if (snd_pcm_format_set_silence(SND_PCM_SFMT_S16_LE, buffer, latency*2) < 0) {
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fprintf(stderr, "silence error\n");
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break;
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}
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if (writebuf(phandle, buffer, latency, &bytes_out) < 0) {
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if (writebuf(phandle, buffer, latency, &frames_out) < 0) {
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fprintf(stderr, "write error\n");
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break;
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}
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#ifdef USE_BLOCK_MODE /* at least two fragments MUST BE filled !!! */
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if (writebuf(phandle, buffer, latency, &bytes_out) < 0)
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break;
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#endif
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if (sync) {
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syncro_id(&ssync);
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if ((err = snd_pcm_sync_go(phandle, &ssync)) < 0) {
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if ((err = snd_pcm_synchro(SND_PCM_SYNCHRO_GO, 2, sync_req, SND_PCM_SYNC_MODE_NORMAL)) < 0) {
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printf("Sync go error: %s\n", snd_strerror(err));
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exit(0);
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}
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} else {
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if ((err = snd_pcm_capture_go(chandle)) < 0) {
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printf("Capture go error: %s\n", snd_strerror(err));
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exit(0);
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}
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if ((err = snd_pcm_playback_go(phandle)) < 0) {
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printf("Playback go error: %s\n", snd_strerror(err));
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exit(0);
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}
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if (sync_req[0].tstamp.tv_sec == sync_req[1].tstamp.tv_sec &&
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sync_req[0].tstamp.tv_usec == sync_req[1].tstamp.tv_usec) {
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printf("Hardware sync\n");
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}
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ok = 1;
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size = 0;
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while (ok && bytes_in < LOOP_LIMIT) {
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if ((r = readbuf(chandle, buffer, latency, &bytes_in)) < 0)
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while (ok && frames_in < LOOP_LIMIT) {
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if ((r = readbuf(chandle, buffer, latency, &frames_in)) < 0)
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ok = 0;
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if (r > 0 && writebuf(phandle, buffer, r, &bytes_out) < 0)
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else if (writebuf(phandle, buffer, r, &frames_out) < 0)
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ok = 0;
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}
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showstat(phandle, SND_PCM_STREAM_PLAYBACK, &pstatus, bytes_out);
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showstat(chandle, SND_PCM_STREAM_CAPTURE, &cstatus, bytes_in);
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snd_pcm_capture_flush(chandle);
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snd_pcm_playback_flush(phandle);
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printf("Playback:\n");
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showstat(phandle, &pstatus, frames_out);
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printf("Capture:\n");
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showstat(chandle, &cstatus, frames_in);
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snd_pcm_flush(chandle);
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snd_pcm_flush(phandle);
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if (ok) {
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printf("Playback time = %li.%i, Record time = %li.%i, diff = %li\n",
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pstatus.stime.tv_sec,
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