diff options
Diffstat (limited to 'muse2/muse/driver/alsatimer.cpp')
| -rw-r--r-- | muse2/muse/driver/alsatimer.cpp | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/muse2/muse/driver/alsatimer.cpp b/muse2/muse/driver/alsatimer.cpp new file mode 100644 index 00000000..d851410d --- /dev/null +++ b/muse2/muse/driver/alsatimer.cpp @@ -0,0 +1,225 @@ + //========================================================= + // MusE + // Linux Music Editor + // $Id: alsatimer.cpp,v 1.1.2.9 2009/03/28 01:46:10 terminator356 Exp $ + // + // Plenty of code borrowed from timer.c example in + // alsalib 1.0.7 + // + // (C) Copyright 2004 Robert Jonsson (rj@spamatica.se) + //========================================================= + + #include "alsatimer.h" + #include <climits> + +#define TIMER_DEBUG 0 + + AlsaTimer::AlsaTimer() + { + if(TIMER_DEBUG) + fprintf(stderr,"AlsaTimer::AlsaTimer(this=%p) called\n",this); + handle = NULL; + id = NULL; + info = NULL; + params = NULL; + findBest = true; + } + + AlsaTimer::~AlsaTimer() + { + if(TIMER_DEBUG) + fprintf(stderr,"AlsaTimer::~AlsaTimer(this=%p) called\n",this); + if (handle) + snd_timer_close(handle); + if (id) snd_timer_id_free(id); + if (info) snd_timer_info_free(info); + if (params) snd_timer_params_free(params); + } + + signed int AlsaTimer::initTimer() + { + if(TIMER_DEBUG) + printf("AlsaTimer::initTimer(this=%p)\n",this); + + int err; + int devclass = SND_TIMER_CLASS_GLOBAL; + int sclass = SND_TIMER_CLASS_NONE; + int card = 0; + int device = SND_TIMER_GLOBAL_SYSTEM; + int subdevice = 0; + int test_ids[] = { SND_TIMER_GLOBAL_SYSTEM + , SND_TIMER_GLOBAL_RTC +#ifdef SND_TIMER_GLOBAL_HPET + , SND_TIMER_GLOBAL_HPET +#endif + }; + int max_ids = sizeof(test_ids) / sizeof(int); + long best_res = LONG_MAX; + //int best_dev = -1; // SND_TIMER_GLOBAL_SYSTEM; + int best_dev = SND_TIMER_GLOBAL_SYSTEM; // p3.3.51 + int i; + + if (id || info || params) { + fprintf(stderr,"AlsaTimer::initTimer(): called on initialised timer!\n"); + return fds->fd; + } + snd_timer_id_malloc(&id); + snd_timer_info_malloc(&info); + snd_timer_params_malloc(¶ms); + + if (findBest) { + for (i = 0; i < max_ids; ++i) { + device = test_ids[i]; + sprintf(timername, "hw:CLASS=%i,SCLASS=%i,CARD=%i,DEV=%i,SUBDEV=%i", devclass, sclass, card, device, subdevice); + if ((err = snd_timer_open(&handle, timername, SND_TIMER_OPEN_NONBLOCK)) < 0) { + continue; + } + if ((err = snd_timer_info(handle, info)) < 0) { + snd_timer_close(handle); + continue; + } + // select a non slave timer with the lowest resolution value + int is_slave = snd_timer_info_is_slave(info); + long res = snd_timer_info_get_resolution(info); + if ((is_slave == 0) && (best_res > res)) { + best_res = res; + best_dev = device; + } + snd_timer_close(handle); + } + device = best_dev; + } + + // p3.3.51 Removed. + //if(best_dev==-1) + // return -1; // no working timer found + + sprintf(timername, "hw:CLASS=%i,SCLASS=%i,CARD=%i,DEV=%i,SUBDEV=%i", devclass, sclass, card, device, subdevice); + if ((err = snd_timer_open(&handle, timername, SND_TIMER_OPEN_NONBLOCK))<0) { + fprintf(stderr, "AlsaTimer::initTimer(): timer open %i (%s)\n", err, snd_strerror(err)); + return -1; // p3.3.51 + } + + if ((err = snd_timer_info(handle, info)) < 0) { + fprintf(stderr, "AlsaTimer::initTimer(): timer info %i (%s)\n", err, snd_strerror(err)); + return -1; + } + + //if(debugMsg) + fprintf(stderr, "AlsaTimer::initTimer(): best available ALSA timer: %s\n", snd_timer_info_get_name(info)); + + snd_timer_params_set_auto_start(params, 1); + snd_timer_params_set_ticks(params, 1); + + if ((err = snd_timer_params(handle, params)) < 0) { + fprintf(stderr, "AlsaTimer::initTimer(): timer params %i (%s)\n", err, snd_strerror(err)); + return -1; + } + + count = snd_timer_poll_descriptors_count(handle); + fds = (pollfd *)calloc(count, sizeof(pollfd)); + if (fds == NULL) { + fprintf(stderr, "AlsaTimer::initTimer(): malloc error\n"); + return -1; + } + if ((err = snd_timer_poll_descriptors(handle, fds, count)) < 0) { + fprintf(stderr, "AlsaTimer::initTimer(): snd_timer_poll_descriptors error: %s\n", snd_strerror(err)); + return -1; + } + return fds->fd; + } + + unsigned int AlsaTimer::setTimerResolution(unsigned int resolution) + { + if(TIMER_DEBUG) + printf("AlsaTimer::setTimerResolution(%d)\n",resolution); + /* Resolution of an AlsaTimer is fixed - it cannot be set */ + return 0; + } + + unsigned int AlsaTimer::setTimerFreq(unsigned int freq) + { + signed int err; + unsigned int setTick, actFreq; + + if(TIMER_DEBUG) + printf("AlsaTimer::setTimerFreq(this=%p)\n",this); + + setTick = (1000000000 / snd_timer_info_get_resolution(info)) / freq; + + if (setTick == 0) { + // return, print error if freq is below 500 (timing will suffer) + if (((1000000000.0 / snd_timer_info_get_resolution(info)) / snd_timer_params_get_ticks(params)) < 500) { + fprintf(stderr,"AlsaTimer::setTimerTicks(): requested freq %u Hz too high for timer (max is %g)\n", + freq, 1000000000.0 / snd_timer_info_get_resolution(info)); + fprintf(stderr," freq stays at %ld Hz\n", + (long int)((1000000000.0 / snd_timer_info_get_resolution(info)) / snd_timer_params_get_ticks(params))); + } + + return 0; + } + actFreq = (1000000000 / snd_timer_info_get_resolution(info)) / setTick; + if (actFreq != freq) { + fprintf(stderr,"AlsaTimer::setTimerTicks(): warning: requested %u Hz, actual freq is %u Hz\n", + freq, actFreq); + } + if(TIMER_DEBUG) + printf("AlsaTimer::setTimerFreq(): Setting ticks (period) to %d ticks\n", setTick); + snd_timer_params_set_auto_start(params, 1); + snd_timer_params_set_ticks(params, setTick); + if ((err = snd_timer_params(handle, params)) < 0) { + fprintf(stderr, "AlsaTimer::setTimerFreq(): timer params %i (%s)\n", err, snd_strerror(err)); + return 0; + } + + return actFreq; + } + + unsigned int AlsaTimer::getTimerResolution() + { + return snd_timer_info_get_resolution(info); + } + + unsigned int AlsaTimer::getTimerFreq() + { + return (1000000000 / snd_timer_info_get_resolution(info)) / snd_timer_params_get_ticks(params); + } + + bool AlsaTimer::startTimer() + { + if(TIMER_DEBUG) + printf("AlsaTimer::startTimer(this=%p): handle=%p\n",this,handle); + int err; + if ((err = snd_timer_start(handle)) < 0) { + fprintf(stderr, "AlsaTimer::startTimer(): timer start %i (%s)\n", err, snd_strerror(err)); + return false; + } + return true; + } + + bool AlsaTimer::stopTimer() + { + int err; + if(TIMER_DEBUG) + printf("AlsaTimer::stopTimer(this=%p): handle=%p\n",this,handle); + if ((err = snd_timer_stop(handle)) < 0) { + fprintf(stderr, "AlsaTimer::stopTimer(): timer stop %i (%s)\n", err, snd_strerror(err)); + return false; + } + return true; + } + + unsigned int AlsaTimer::getTimerTicks(bool printTicks) + { + //if(TIMER_DEBUG) + // printf("AlsaTimer::getTimerTicks\n"); + snd_timer_read_t tr; + tr.ticks = 0; + while (snd_timer_read(handle, &tr, sizeof(tr)) == sizeof(tr)) { + if (printTicks) { + printf("TIMER: resolution = %uns, ticks = %u\n", + tr.resolution, tr.ticks); + } + } + return tr.ticks; + } |