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-rw-r--r--plugins/alsa/alsa-core-pcm.c237
-rw-r--r--plugins/alsa/alsa-softmixer.h7
2 files changed, 177 insertions, 67 deletions
diff --git a/plugins/alsa/alsa-core-pcm.c b/plugins/alsa/alsa-core-pcm.c
index a45d463..9d46dcc 100644
--- a/plugins/alsa/alsa-core-pcm.c
+++ b/plugins/alsa/alsa-core-pcm.c
@@ -169,7 +169,7 @@ PUBLIC int AlsaPcmConf(SoftMixerT *mixer, AlsaPcmCtlT *pcm, int mode) {
/* The following code, that
* 1) sets period time/size; buffer time/size hardware params
- * 2) sets start and stop threashold in software params
+ * 2) sets start and stop threshold in software params
* ... is taken as such from 'aplay' in alsa-utils */
unsigned buffer_time = 0;
@@ -275,6 +275,8 @@ PUBLIC int AlsaPcmConf(SoftMixerT *mixer, AlsaPcmCtlT *pcm, int mode) {
// available_min is the minimum number of frames available to read,
// when the call to poll returns. Assume this is the same for playback (not checked that)
+ AFB_API_DEBUG(mixer->api, "(%s) try AVAIL_MIN: %ld", card, n);
+
if ((error = snd_pcm_sw_params_set_avail_min(pcm->handle, pxmSwParams, n)) < 0) {
AFB_ApiError(mixer->api,
"%s (%s): mixer=%s Fail set_buffersize error=%s",
@@ -283,11 +285,12 @@ PUBLIC int AlsaPcmConf(SoftMixerT *mixer, AlsaPcmCtlT *pcm, int mode) {
};
snd_pcm_sw_params_get_avail_min(pxmSwParams, &pcm->avail_min);
+ AFB_API_DEBUG(mixer->api, "(%s) AVAIL_MIN set to : %ld", card, pcm->avail_min);
int start_delay = 0;
snd_pcm_uframes_t start_threshold;
- /* round up to closest transfer boundary */
+ /* round up to closest transfer boundary. Start delay is in microseconds */
n = buffer_size;
if (start_delay <= 0) {
start_threshold = n + (size_t)((double)rate * start_delay / 1000000);
@@ -340,13 +343,14 @@ STATIC int AlsaPcmReadCB( AlsaPcmCopyHandleT * pcmCopyHandle) {
snd_pcm_uframes_t bufSize = alsa_ringbuf_buffer_size(rbuf);
int err;
+ const char * uid = ALSA_PCM_UID(pcmIn, string);
// do we have waiting frames ?
availIn = snd_pcm_avail_update(pcmIn);
if (availIn <= 0) {
if (availIn == -EPIPE) {
int ret = xrun(pcmIn, (int)availIn);
- AFB_ApiDebug(pcmCopyHandle->api, "XXX read EPIPE (recov=%d) {%s}!", ret, ALSA_PCM_UID(pcmIn, string));
+ AFB_ApiDebug(pcmCopyHandle->api, "XXX read EPIPE (recov=%d) {%s}!", ret, uid);
// For some (undocumented...) reason, a start is mandatory.
snd_pcm_start(pcmIn);
@@ -376,14 +380,13 @@ STATIC int AlsaPcmReadCB( AlsaPcmCopyHandleT * pcmCopyHandle) {
pthread_mutex_unlock(&pcmCopyHandle->mutex);
nbRead = snd_pcm_readi(pcmIn, buf, remain);
-
if (nbRead == 0) {
break;
}
if (nbRead < 0) {
if (nbRead== -EPIPE) {
err = xrun(pcmIn, (int)nbRead);
- AFB_ApiDebug(pcmCopyHandle->api, "read EPIPE (%d), recov %d", ++pcmCopyHandle->read_err_count, err);
+ AFB_ApiDebug(pcmCopyHandle->api, "read EPIPE (%d), recov %d {%s}", ++pcmCopyHandle->read_err_count, err, uid);
goto ExitOnSuccess;
} else if (nbRead== -ESTRPIPE) {
AFB_ApiDebug(pcmCopyHandle->api, "read ESTRPIPE");
@@ -391,6 +394,7 @@ STATIC int AlsaPcmReadCB( AlsaPcmCopyHandleT * pcmCopyHandle) {
goto ExitOnSuccess;
nbRead = 0;
} else {
+ AFB_API_DEBUG(pcmCopyHandle->api, "read error: %ld (%s) {%s}", -nbRead, strerror((int)-nbRead), uid);
goto ExitOnSuccess;
}
}
@@ -422,7 +426,6 @@ ExitOnSuccess:
static int xrun( snd_pcm_t * pcm, int error)
{
int err;
-
if ((err = snd_pcm_recover(pcm, error, 1)) < 0) {
return err;
}
@@ -445,8 +448,8 @@ static int suspend( snd_pcm_t * pcm, int error)
static void readSuspend(AlsaPcmCopyHandleT * pcmCopyHandle) {
// will be deaf
- pcmCopyHandle->saveFd = pcmCopyHandle->pollFds[1].fd;
- pcmCopyHandle->pollFds[1].fd = -1;
+ pcmCopyHandle->saveFd = pcmCopyHandle->pollFdsIn[1].fd;
+ pcmCopyHandle->pollFdsIn[1].fd = -1;
AFB_ApiNotice(pcmCopyHandle->api, "capture muted");
}
@@ -454,7 +457,7 @@ static void readSuspend(AlsaPcmCopyHandleT * pcmCopyHandle) {
static void readResume(AlsaPcmCopyHandleT * pcmCopyHandle) {
// undeaf it
- pcmCopyHandle->pollFds[1].fd = pcmCopyHandle->saveFd;
+ pcmCopyHandle->pollFdsIn[1].fd = pcmCopyHandle->saveFd;
snd_pcm_prepare(pcmCopyHandle->pcmIn->handle);
snd_pcm_start(pcmCopyHandle->pcmIn->handle);
AFB_ApiNotice(pcmCopyHandle->api, "capture unmuted");
@@ -466,32 +469,26 @@ static void *readThreadEntry(void *handle) {
AlsaPcmCopyHandleT *pcmCopyHandle = (AlsaPcmCopyHandleT*) handle;
pcmCopyHandle->tid = (int) syscall(SYS_gettid);
- int ix;
AFB_ApiNotice(pcmCopyHandle->api,
"%s :%s/%d Started, muted=%d",
__func__, pcmCopyHandle->info, pcmCopyHandle->tid, pcmCopyHandle->pcmIn->mute);
- struct pollfd * eventFd = &pcmCopyHandle->pollFds[0];
- struct pollfd * framePfds = &pcmCopyHandle->pollFds[1];
-
- eventFd->events = POLLIN | POLLHUP;
+ struct pollfd * eventFd = &pcmCopyHandle->pollFdsIn[0];
+ struct pollfd * framePfds = &pcmCopyHandle->pollFdsIn[1];
- for (ix = 0; ix <pcmCopyHandle->nbPcmFds-1; ix++) {
- framePfds[ix].events = POLLIN | POLLHUP;
- }
+ eventFd->events = POLLIN;
bool muted = pcmCopyHandle->pcmIn->mute;
if (muted)
readSuspend(pcmCopyHandle);
-
/* loop until end */
for (;;) {
- int err = poll(pcmCopyHandle->pollFds, pcmCopyHandle->nbPcmFds, LOOP_TIMEOUT_MSEC);
- if (err < 0) {
+ int err = poll(pcmCopyHandle->pollFdsIn, pcmCopyHandle->nbPcmFdsIn, LOOP_TIMEOUT_MSEC);
+ if (err < 0) {
AFB_ApiError(pcmCopyHandle->api, "%s: poll err %s", __func__, strerror(errno));
continue;
}
@@ -503,7 +500,7 @@ static void *readThreadEntry(void *handle) {
}
// handle the incoming events/mute order
- if ((eventFd->revents & EPOLLIN) != 0) {
+ if ((eventFd->revents & POLLIN) != 0) {
PcmCopyEvent event;
size_t ret = read(eventFd->fd, &event, sizeof(event));
@@ -537,8 +534,7 @@ static void *readThreadEntry(void *handle) {
unsigned short revents = 0;
- int res = snd_pcm_poll_descriptors_revents(pcmCopyHandle->pcmIn->handle, framePfds, pcmCopyHandle->nbPcmFds, &revents);
-
+ int res = snd_pcm_poll_descriptors_revents(pcmCopyHandle->pcmIn->handle, framePfds, pcmCopyHandle->nbPcmFdsIn-1, &revents);
if (res == -ENODEV) {
sleep(1);
continue;
@@ -549,6 +545,11 @@ static void *readThreadEntry(void *handle) {
continue;
}
+ if (!(revents & POLLIN)) {
+ AFB_API_DEBUG(pcmCopyHandle->api, "no POLLIN. try again !");
+ continue;
+ }
+
AlsaPcmReadCB(pcmCopyHandle);
}
done:
@@ -564,23 +565,14 @@ static void *writeThreadEntry(void *handle) {
alsa_ringbuf_t * rbuf = pcmCopyHandle->rbuf;
- snd_pcm_status_t *pcmOutStatus;
- snd_pcm_uframes_t pcmOutSize;
-
- snd_pcm_sframes_t threshold;
-
- snd_pcm_status_alloca(&pcmOutStatus);
- snd_pcm_status(pcmOut, pcmOutStatus);
- pcmOutSize = snd_pcm_status_get_avail_max(pcmOutStatus);
-
const char * cardid = pcmCopyHandle->pcmOut->cid.cardid;
- /* This threshold is the expected space available in the hw output buffer
- * The aim is to wait to have a significant amount of space, in order to
- * avoid to write to the device too often, or take a very small amount of
- * frames from the ring buffer. So basically, this saves some CPU load */
+ struct pollfd * eventFd = &pcmCopyHandle->pollFdsOut[0];
+ struct pollfd * framePfds = &pcmCopyHandle->pollFdsOut[1];
- threshold = pcmOutSize / 3;
+ eventFd->events = POLLIN;
+
+ const char * name = pcmCopyHandle->pcmOut->name;
for (;;) {
@@ -593,6 +585,62 @@ static void *writeThreadEntry(void *handle) {
goto done;
}
+ int err = poll(pcmCopyHandle->pollFdsOut, pcmCopyHandle->nbPcmFdsOut, LOOP_TIMEOUT_MSEC);
+ if (err < 0) {
+ AFB_API_ERROR(pcmCopyHandle->api, "%s: %s poll out err %s", __func__, name, strerror(errno));
+ continue;
+ }
+
+ // timeout
+ if (err == 0)
+ continue;
+
+ // handle the incoming events/mute order
+ if ((eventFd->revents & POLLIN) != 0) {
+ PcmCopyEvent event;
+
+ size_t ret = read(eventFd->fd, &event, sizeof(event));
+ if (ret <= 0)
+ continue;
+
+ switch (event.eventType) {
+ case PCM_COPY_MUTE:
+ case PCM_COPY_UNMUTE:
+ break;
+ case PCM_COPY_END:
+ AFB_API_DEBUG(pcmCopyHandle->api, "%s ending -> EXIT", __func__);
+ goto done;
+ break;
+ case PCM_COPY_LAST:
+ default:
+ AFB_API_ERROR(pcmCopyHandle->api, "%s: Unexpected event 0x%x", __func__, event.eventType);
+ break;
+ }
+ continue;
+ }
+
+ unsigned short revents = 0;
+
+ int res = snd_pcm_poll_descriptors_revents(pcmCopyHandle->pcmOut->handle, framePfds, pcmCopyHandle->nbPcmFdsOut-1, &revents);
+ if (res == -ENODEV) {
+ sleep(1);
+ continue;
+ }
+
+ if (revents & POLLHUP) {
+ AFB_API_NOTICE(pcmCopyHandle->api, "Frame POLLHUP");
+ continue;
+ }
+
+ // not ready ... wait again
+ if ((revents & POLLOUT) == 0) {
+ // When that quirk is set, continuing to poll again would block too much time
+ // and led to a EPIPE
+ // Instead, we ignore the "non ready state" and perform the write directly
+ if ((pcmCopyHandle->pcmOut->quirks & QUIRK_BOGUS_POLL_REVENTS_DEMANGLING) == 0)
+ continue;
+ }
+
snd_pcm_sframes_t used, nbWritten;
snd_pcm_sframes_t availOut = snd_pcm_avail(pcmOut);
@@ -609,15 +657,9 @@ static void *writeThreadEntry(void *handle) {
}
}
- // no space for output
- if (availOut <= threshold) {
- usleep(500);
- continue;
- }
-
pthread_mutex_lock(&pcmCopyHandle->mutex);
used = alsa_ringbuf_frames_used(rbuf);
- if (used <= 0) {
+ if (used <= 0) { /* no more frames*/
pthread_mutex_unlock(&pcmCopyHandle->mutex);
break; // will wait again
}
@@ -640,8 +682,11 @@ static void *writeThreadEntry(void *handle) {
} else if (nbWritten == -ESTRPIPE) {
AFB_ApiDebug(pcmCopyHandle->api, "XXX write ESTRPIPE");
break;
+ } else if (nbWritten == 0) {
+ AFB_API_DEBUG(pcmCopyHandle->api, "%s: nothing was written", __func__);
+ break;
}
- AFB_ApiDebug(pcmCopyHandle->api, "Unhandled error %s", strerror(errno));
+ AFB_ApiDebug(pcmCopyHandle->api, "%s: Unhandled error %s", __func__, strerror((int)-nbWritten));
break;
}
@@ -676,8 +721,11 @@ static int AlsaPcmCopyEnd(SoftMixerT *mixer, AlsaPcmCopyHandleT * handle) {
handle->ending = true;
// wake up the reader through the eventfd
AlsaPcmCopyEndSignal(mixer, handle->pcmIn);
+
// wake up the writer through the wait semaphore
sem_post(&handle->sem);
+ // and make in exit from poll
+ AlsaPcmCopyEndSignal(mixer, handle->pcmOut);
return 0;
}
@@ -700,7 +748,8 @@ PUBLIC int AlsaPcmCopyStop(SoftMixerT *mixer, AlsaPcmCopyHandleT * handle) {
alsa_ringbuf_free(handle->rbuf);
- free(handle->pollFds);
+ free(handle->pollFdsIn);
+ free(handle->pollFdsOut);
free(handle);
return 0;
@@ -791,7 +840,7 @@ PUBLIC int AlsaPcmCopyStart(SoftMixerT *mixer, AlsaStreamAudioT *stream, AlsaPcm
cHandle->stream = stream;
cHandle->frame_size = (snd_pcm_format_physical_width(opts->format) / 8) * opts->channels;
- AFB_ApiDebug(mixer->api, "%s: Frame size is %zu", __func__, cHandle->frame_size);
+ AFB_ApiDebug(mixer->api, "%s: Frame size is %zu (%d channels)", __func__, cHandle->frame_size, opts->channels);
AFB_ApiDebug(mixer->api, "%s: Buffer delay is %d ms", __func__, stream->delayms);
snd_pcm_uframes_t nbFrames = (stream->delayms * opts->rate)/1000;
@@ -807,6 +856,29 @@ PUBLIC int AlsaPcmCopyStart(SoftMixerT *mixer, AlsaStreamAudioT *stream, AlsaPcm
AFB_ApiDebug(mixer->api, "%s Copy buffer: nbframes is %zu", __func__, nbFrames);
+ // get FD poll descriptor for playback PCM
+ int pcmOutCount = snd_pcm_poll_descriptors_count(pcmOut->handle);
+ if (pcmOutCount <= 0) {
+ AFB_API_ERROR(mixer->api,
+ "%s: Fail pcmOut=%s get fds count error=%s",
+ __func__, ALSA_PCM_UID(pcmOut->handle, string), snd_strerror(error));
+ goto OnErrorExit;
+ }
+
+ cHandle->nbPcmFdsOut = pcmOutCount+1;
+ cHandle->pollFdsOut = (struct pollfd *) malloc((cHandle->nbPcmFdsOut)*sizeof(struct pollfd));
+ if (cHandle->pollFdsOut == NULL){
+ SOFTMIXER_NOMEM(mixer->api);
+ goto OnErrorExit;
+ }
+
+ if ((error = snd_pcm_poll_descriptors(pcmOut->handle, cHandle->pollFdsOut+1, pcmOutCount)) < 0) {
+ AFB_API_ERROR(mixer->api,
+ "%s: Fail pcmOut=%s get pollfds error=%s",
+ __func__, ALSA_PCM_UID(pcmOut->handle, string), snd_strerror(error));
+ goto OnErrorExit;
+ };
+
// get FD poll descriptor for capture PCM
int pcmInCount = snd_pcm_poll_descriptors_count(pcmIn->handle);
if (pcmInCount <= 0) {
@@ -816,43 +888,61 @@ PUBLIC int AlsaPcmCopyStart(SoftMixerT *mixer, AlsaStreamAudioT *stream, AlsaPcm
goto OnErrorExit;
}
- cHandle->nbPcmFds = pcmInCount+1;
- cHandle->pollFds = (struct pollfd *) malloc((cHandle->nbPcmFds)*sizeof(struct pollfd));
- if (cHandle->pollFds == NULL){
+ cHandle->nbPcmFdsIn = pcmInCount+1;
+ cHandle->pollFdsIn = (struct pollfd *) malloc((cHandle->nbPcmFdsIn)*sizeof(struct pollfd));
+ if (cHandle->pollFdsIn == NULL){
SOFTMIXER_NOMEM(mixer->api);
goto OnErrorExit;
}
- if ((error = snd_pcm_poll_descriptors(pcmIn->handle, cHandle->pollFds+1, pcmInCount)) < 0) {
+ if ((error = snd_pcm_poll_descriptors(pcmIn->handle, cHandle->pollFdsIn+1, pcmInCount)) < 0) {
AFB_ApiError(mixer->api,
"%s: Fail pcmIn=%s get pollfds error=%s",
__func__, ALSA_PCM_UID(pcmOut->handle, string), snd_strerror(error));
goto OnErrorExit;
};
- // create the mute pipe
- int eventFdPipe[2];
- error = pipe(eventFdPipe);
+ // create the event pipe for capture
+ int eventFdPipeIn[2];
+ error = pipe(eventFdPipeIn);
if (error < 0) {
AFB_ApiError(mixer->api,
- "Unable to create the mute signaling pipe");
+ "Unable to create the mute signaling pipe for capture");
goto OnErrorExit;
}
- struct pollfd * eventPollFd = &cHandle->pollFds[0];
+ struct pollfd * eventPollFdIn = &cHandle->pollFdsIn[0];
// read end
- eventPollFd->fd = eventFdPipe[0];
- eventPollFd->events = POLLIN;
- eventPollFd->revents = 0;
+ eventPollFdIn->fd = eventFdPipeIn[0];
+ eventPollFdIn->events = POLLIN;
+ eventPollFdIn->revents = 0;
// write end
- pcmIn->eventFd = eventFdPipe[1];
+ pcmIn->eventFd = eventFdPipeIn[1];
+
+ // create the event pipe for playback
+ int eventFdPipeOut[2];
+ error = pipe(eventFdPipeOut);
+ if (error < 0) {
+ AFB_API_ERROR(mixer->api,
+ "Unable to create the signaling pipe for playback");
+ goto OnErrorExit;
+ }
+
+ struct pollfd * eventPollFdOut = &cHandle->pollFdsOut[0];
+ // read end
+ eventPollFdOut->fd = eventFdPipeOut[0];
+ eventPollFdOut->events = POLLIN;
+ eventPollFdOut->revents = 0;
+
+ // write end
+ pcmOut->eventFd = eventFdPipeOut[1];
error = sem_init(&cHandle->sem, 0 , 0);
if (error < 0) {
AFB_ApiError(mixer->api,
- "%s Fail initialize loop semaphore pcmIn=%s err=%d",
- __func__, ALSA_PCM_UID(pcmIn->handle, string), error);
+ "%s Fail to initialize the loop semaphore pcmIn=%s err=%d",
+ __func__, ALSA_PCM_UID(pcmIn->handle, string), error);
goto OnErrorExit;
}
@@ -910,11 +1000,28 @@ OnErrorExit:
AFB_ApiError(mixer->api, "%s: - pcmIn=%s" , __func__, ALSA_PCM_UID(pcmIn->handle, string));
AFB_ApiError(mixer->api, "%s: - pcmOut=%s", __func__, ALSA_PCM_UID(pcmOut->handle, string));
- if (cHandle &&cHandle->pollFds) {
- free (cHandle->pollFds);
- cHandle->pollFds = NULL;
+ if (cHandle &&cHandle->pollFdsIn) {
+ free (cHandle->pollFdsIn);
+ cHandle->pollFdsIn = NULL;
+ }
+
+ if (cHandle && cHandle->pollFdsOut) {
+ free (cHandle->pollFdsOut);
+ cHandle->pollFdsOut = NULL;
}
+ if (eventFdPipeIn[0])
+ close(eventFdPipeIn[0]);
+
+ if (eventFdPipeIn[1])
+ close(eventFdPipeIn[1]);
+
+ if (eventFdPipeOut[0])
+ close(eventFdPipeOut[0]);
+
+ if (eventFdPipeOut[1])
+ close(eventFdPipeOut[1]);
+
if (cHandle)
free(cHandle);
diff --git a/plugins/alsa/alsa-softmixer.h b/plugins/alsa/alsa-softmixer.h
index 781411d..7b98b5b 100644
--- a/plugins/alsa/alsa-softmixer.h
+++ b/plugins/alsa/alsa-softmixer.h
@@ -158,8 +158,11 @@ typedef struct {
int tid;
char* info;
- int nbPcmFds;
- struct pollfd * pollFds;
+ int nbPcmFdsIn;
+ struct pollfd * pollFdsIn;
+
+ int nbPcmFdsOut;
+ struct pollfd * pollFdsOut;
sem_t sem;
pthread_mutex_t mutex;