Added snd_timer_async() function.

More updates to pcm_dmix.c .

src/pcm/pcm_dmix.c

@@ -48,6 +48,12 @@
 const char *_snd_module_pcm_dmix = "";
 #endif
 
+/*
+ *
+ */
+ 
+int snd_timer_async(snd_timer_t *timer, int sig, pid_t pid);
+
 /*
  *
  */
@@ -432,24 +438,51 @@ static int client_discard(snd_pcm_dmix_t *dmix)
 	return 0;
 }
 
+/*
+ *  ring buffer operation
+ */
+
+/*
+ *  synchronize shm ring buffer with hardware
+ */
+static void snd_pcm_dmix_sync_ptr(snd_pcm_t *pcm, snd_pcm_uframes_t size)
+{
+	snd_pcm_dmix_t *dmix = pcm->private_data;
+	snd_pcm_uframes_t appl_ptr;
+	
+	/* get the start of update area */
+	appl_ptr = dmix->appl_ptr - size;
+	if (appl_ptr > pcm->boundary)
+		appl_ptr += pcm->boundary;
+}
+
 /*
  *  plugin implementation
  */
 
-static int snd_pcm_dmix_nonblock(snd_pcm_t *pcm, int nonblock)
+static int snd_pcm_dmix_nonblock(snd_pcm_t *pcm, int nonblock ATTRIBUTE_UNUSED)
 {
+	/* value is cached for us in pcm->mode (SND_PCM_NONBLOCK flag) */
 	return 0;
 }
 
 static int snd_pcm_dmix_async(snd_pcm_t *pcm, int sig, pid_t pid)
 {
 	snd_pcm_dmix_t *dmix = pcm->private_data;
-	return 0;
+	return snd_timer_async(dmix->timer, sig, pid);
 }
 
 static int snd_pcm_dmix_info(snd_pcm_t *pcm, snd_pcm_info_t * info)
 {
 	snd_pcm_dmix_t *dmix = pcm->private_data;
+	memset(info, 0, sizeof(*info));
+	info->stream = pcm->stream;
+	info->card = -1;
+	/* FIXME: fill this with something more useful: we know the hardware name */
+	strncpy(info->id, pcm->name, sizeof(info->id));
+	strncpy(info->name, pcm->name, sizeof(info->name));
+	strncpy(info->subname, pcm->name, sizeof(info->subname));
+	info->subdevices_count = 1;
 	return 0;
 }
 
@@ -499,26 +532,25 @@ static int snd_pcm_dmix_hw_refine(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
 
 static int snd_pcm_dmix_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t * params)
 {
-	snd_pcm_dmix_t *dmix = pcm->private_data;
+	// snd_pcm_dmix_t *dmix = pcm->private_data;
 	return 0;
 }
 
 static int snd_pcm_dmix_hw_free(snd_pcm_t *pcm)
 {
-	snd_pcm_dmix_t *dmix = pcm->private_data;
+	// snd_pcm_dmix_t *dmix = pcm->private_data;
 	return 0;
 }
 
 static int snd_pcm_dmix_sw_params(snd_pcm_t *pcm, snd_pcm_sw_params_t * params)
 {
-	snd_pcm_dmix_t *dmix = pcm->private_data;
+	// snd_pcm_dmix_t *dmix = pcm->private_data;
 	return 0;
 }
 
 static int snd_pcm_dmix_channel_info(snd_pcm_t *pcm, snd_pcm_channel_info_t * info)
 {
-	snd_pcm_dmix_t *dmix = pcm->private_data;
-	return 0;
+        return snd_pcm_channel_info_shm(pcm, info, -1);
 }
 
 static int snd_pcm_dmix_status(snd_pcm_t *pcm, snd_pcm_status_t * status)
@@ -595,33 +627,35 @@ static int snd_pcm_dmix_resume(snd_pcm_t *pcm)
 
 static snd_pcm_sframes_t snd_pcm_dmix_writei(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size)
 {
-	return -ENODEV;
+	int res = snd_pcm_mmap_writei(pcm, buffer, size);
+	snd_pcm_dmix_sync_ptr(pcm, size);
+	return res;
 }
 
 static snd_pcm_sframes_t snd_pcm_dmix_writen(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size)
 {
-	return -ENODEV;
+	int res = snd_pcm_mmap_writen(pcm, bufs, size);
+	snd_pcm_dmix_sync_ptr(pcm, size);
+	return res;
 }
 
-static snd_pcm_sframes_t snd_pcm_dmix_readi(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size)
+static snd_pcm_sframes_t snd_pcm_dmix_readi(snd_pcm_t *pcm ATTRIBUTE_UNUSED, void *buffer ATTRIBUTE_UNUSED, snd_pcm_uframes_t size ATTRIBUTE_UNUSED)
 {
 	return -ENODEV;
 }
 
-static snd_pcm_sframes_t snd_pcm_dmix_readn(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size)
+static snd_pcm_sframes_t snd_pcm_dmix_readn(snd_pcm_t *pcm ATTRIBUTE_UNUSED, void **bufs ATTRIBUTE_UNUSED, snd_pcm_uframes_t size ATTRIBUTE_UNUSED)
 {
 	return -ENODEV;
 }
 
-static int snd_pcm_dmix_mmap(snd_pcm_t *pcm)
+static int snd_pcm_dmix_mmap(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
 {
-	snd_pcm_dmix_t *dmix = pcm->private_data;
 	return 0;
 }
 
-static int snd_pcm_dmix_munmap(snd_pcm_t *pcm)
+static int snd_pcm_dmix_munmap(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
 {
-	snd_pcm_dmix_t *dmix = pcm->private_data;
 	return 0;
 }
 
@@ -651,13 +685,14 @@ static snd_pcm_sframes_t snd_pcm_dmix_mmap_commit(snd_pcm_t *pcm,
 						  snd_pcm_uframes_t offset ATTRIBUTE_UNUSED,
 						  snd_pcm_uframes_t size)
 {
-	snd_pcm_dmix_t *hw = pcm->private_data;
-	return 0;
+	snd_pcm_mmap_appl_forward(pcm, size);
+	snd_pcm_dmix_sync_ptr(pcm, size);
+	return size;
 }
 
-static snd_pcm_sframes_t snd_pcm_dmix_avail_update(snd_pcm_t *pcm)
+static snd_pcm_sframes_t snd_pcm_dmix_avail_update(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
 {
-	snd_pcm_dmix_t *hw = pcm->private_data;
+	//snd_pcm_dmix_t *dmix = pcm->private_data;
 	return 0;
 }
 

src/pcm/pcm_null.c

@@ -65,7 +65,7 @@ static int snd_pcm_null_async(snd_pcm_t *pcm ATTRIBUTE_UNUSED, int sig ATTRIBUTE
 	return -ENOSYS;
 }
 
-static int snd_pcm_null_info(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_info_t * info)
+static int snd_pcm_null_info(snd_pcm_t *pcm, snd_pcm_info_t * info)
 {
 	memset(info, 0, sizeof(*info));
 	info->stream = pcm->stream;
@@ -79,7 +79,6 @@ static int snd_pcm_null_info(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_info_t * i
 
 static int snd_pcm_null_channel_info(snd_pcm_t *pcm, snd_pcm_channel_info_t * info)
 {
-	snd_pcm_null_t *null = pcm->private_data;
 	return snd_pcm_channel_info_shm(pcm, info, -1);
 }
 

src/timer/timer.c

@@ -73,6 +73,7 @@ This example shows opening a timer device and reading of timer events.
 #include <string.h>
 #include <fcntl.h>
 #include <dlfcn.h>
+#include <signal.h>
 #include <sys/ioctl.h>
 #include "timer_local.h"
 
@@ -350,6 +351,27 @@ int snd_timer_nonblock(snd_timer_t *timer, int nonblock)
 	return 0;
 }
 
+#ifndef DOC_HIDDEN
+/**
+ * \brief set async mode
+ * \param timer timer handle
+ * \param sig Signal to raise: < 0 disable, 0 default (SIGIO)
+ * \param pid Process ID to signal: 0 current
+ * \return 0 on success otherwise a negative error code
+ *
+ * A signal is raised every period.
+ */
+int snd_timer(snd_timer_t *timer, int sig, pid_t pid)
+{
+	assert(timer);
+        if (sig == 0)
+                sig = SIGIO;
+	if (pid == 0)
+		pid = getpid();
+	return timer->ops->async(timer, sig, pid);
+}
+#endif
+
 /**
  * \brief get size of the snd_timer_info_t structure in bytes
  * \return size of the snd_timer_info_t structure in bytes

src/timer/timer_hw.c

@@ -23,6 +23,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
+#define __USE_GNU
 #include <fcntl.h>
 #include <sys/ioctl.h>
 #include "timer_local.h"
@@ -61,6 +62,38 @@ static int snd_timer_hw_nonblock(snd_timer_t *timer, int nonblock)
 	return 0;
 }
 
+static int snd_timer_hw_async(snd_timer_t *timer, int sig, pid_t pid)
+{
+	long flags;
+	int fd;
+
+	assert(timer);
+	fd = timer->poll_fd;
+	if ((flags = fcntl(fd, F_GETFL)) < 0) {
+		SYSERR("F_GETFL failed");
+		return -errno;
+	}
+	if (sig >= 0)
+		flags |= O_ASYNC;
+	else
+		flags &= ~O_ASYNC;
+	if (fcntl(fd, F_SETFL, flags) < 0) {
+		SYSERR("F_SETFL for O_ASYNC failed");
+		return -errno;
+	}
+	if (sig < 0)
+		return 0;
+	if (fcntl(fd, F_SETSIG, (long)sig) < 0) {
+		SYSERR("F_SETSIG failed");
+		return -errno;
+	}
+	if (fcntl(fd, F_SETOWN, (long)pid) < 0) {
+		SYSERR("F_SETOWN failed");
+		return -errno;
+	}
+	return 0;
+}
+
 static int snd_timer_hw_info(snd_timer_t *handle, snd_timer_info_t * info)
 {
 	snd_timer_t *tmr;
@@ -148,15 +181,16 @@ static ssize_t snd_timer_hw_read(snd_timer_t *handle, void *buffer, size_t size)
 }
 
 static snd_timer_ops_t snd_timer_hw_ops = {
-	close: snd_timer_hw_close,
-	nonblock: snd_timer_hw_nonblock,
-	info: snd_timer_hw_info,
-	params: snd_timer_hw_params,
-	status: snd_timer_hw_status,
-	rt_start: snd_timer_hw_start,
-	rt_stop: snd_timer_hw_stop,
-	rt_continue: snd_timer_hw_continue,
-	read: snd_timer_hw_read,
+	.close = snd_timer_hw_close,
+	.nonblock = snd_timer_hw_nonblock,
+	.async = snd_timer_hw_async,
+	.info = snd_timer_hw_info,
+	.params = snd_timer_hw_params,
+	.status = snd_timer_hw_status,
+	.rt_start = snd_timer_hw_start,
+	.rt_stop = snd_timer_hw_stop,
+	.rt_continue = snd_timer_hw_continue,
+	.read = snd_timer_hw_read,
 };
 
 int snd_timer_hw_open(snd_timer_t **handle, const char *name, int dev_class, int dev_sclass, int card, int device, int subdevice, int mode)

src/timer/timer_local.h

@@ -27,6 +27,7 @@
 typedef struct {
 	int (*close)(snd_timer_t *timer);
 	int (*nonblock)(snd_timer_t *timer, int nonblock);
+	int (*async)(snd_timer_t *timer, int sig, pid_t pid);
 	int (*info)(snd_timer_t *timer, snd_timer_info_t *info);
 	int (*params)(snd_timer_t *timer, snd_timer_params_t *params);
 	int (*status)(snd_timer_t *timer, snd_timer_status_t *status);
@@ -62,3 +63,5 @@ struct _snd_timer_query {
 };
 
 int snd_timer_query_hw_open(snd_timer_query_t **handle, const char *name, int mode);
+
+int snd_timer_async(snd_timer_t *timer, int sig, pid_t pid);