Cleanups in IPC stuff.

Cleanups in snd_pcm_close().
Added initial code for dmix plugin:
  - only skeleton, but all major problems should be solved

src/pcm/Makefile.am

@@ -8,7 +8,7 @@ libpcm_la_SOURCES = atomic.c mask.c interval.c \
 		    pcm_rate.c pcm_plug.c pcm_misc.c pcm_mmap.c pcm_multi.c \
 	            pcm_shm.c pcm_file.c pcm_null.c pcm_share.c \
 		    pcm_meter.c pcm_hooks.c pcm_lfloat.c pcm_ladspa.c \
-		    pcm_symbols.c
+		    pcm_dmix.c pcm_symbols.c
 noinst_HEADERS = pcm_local.h pcm_plugin.h mask.h mask_inline.h \
 	         interval.h interval_inline.h plugin_ops.h ladspa.h
 

src/pcm/pcm.c

@@ -672,16 +672,7 @@ int snd_pcm_close(snd_pcm_t *pcm)
 	err = pcm->ops->close(pcm->op_arg);
 	if (err < 0)
 		return err;
-	if (pcm->name)
-		free(pcm->name);
-	if (pcm->hw.link_dst)
-		free(pcm->hw.link_dst);
-	if (pcm->appl.link_dst)
-		free(pcm->appl.link_dst);
-	if (pcm->dl_handle)
-		snd_dlclose(pcm->dl_handle);
-	free(pcm);
-	return 0;
+	return snd_pcm_free(pcm);
 }	
 
 /**
@@ -1875,6 +1866,21 @@ int snd_pcm_new(snd_pcm_t **pcmp, snd_pcm_type_t type, const char *name,
 	return 0;
 }
 
+int snd_pcm_free(snd_pcm_t *pcm)
+{
+	assert(pcm);
+	if (pcm->name)
+		free(pcm->name);
+	if (pcm->hw.link_dst)
+		free(pcm->hw.link_dst);
+	if (pcm->appl.link_dst)
+		free(pcm->appl.link_dst);
+	if (pcm->dl_handle)
+		snd_dlclose(pcm->dl_handle);
+	free(pcm);
+	return 0;
+}
+
 int snd_pcm_open_slave(snd_pcm_t **pcmp, snd_config_t *root,
 		       snd_config_t *conf, snd_pcm_stream_t stream,
 		       int mode)
@@ -5782,11 +5788,7 @@ int snd_pcm_mmap_begin(snd_pcm_t *pcm,
 	snd_pcm_uframes_t f;
 	snd_pcm_uframes_t avail;
 	assert(pcm && areas && offset && frames);
-	if (pcm->stopped_areas &&
-	    snd_pcm_state(pcm) != SND_PCM_STATE_RUNNING) 
-		*areas = pcm->stopped_areas;
-	else
-		*areas = pcm->running_areas;
+	*areas = snd_pcm_mmap_areas(pcm);
 	*offset = *pcm->appl.ptr % pcm->buffer_size;
 	cont = pcm->buffer_size - *offset;
 	f = *frames;

src/pcm/pcm_local.h

@@ -111,6 +111,7 @@ typedef struct _snd_pcm_channel_info {
 	union {
 		struct {
 			int shmid;
+			int remove;
 		} shm;
 		struct {
 			int fd;
@@ -214,6 +215,7 @@ struct _snd_pcm {
 
 int snd_pcm_new(snd_pcm_t **pcmp, snd_pcm_type_t type, const char *name,
 		snd_pcm_stream_t stream, int mode);
+int snd_pcm_free(snd_pcm_t *pcm);
 
 void snd_pcm_areas_from_buf(snd_pcm_t *pcm, snd_pcm_channel_area_t *areas, void *buf);
 void snd_pcm_areas_from_bufs(snd_pcm_t *pcm, snd_pcm_channel_area_t *areas, void **bufs);
@@ -709,6 +711,8 @@ int snd_pcm_open_slave(snd_pcm_t **pcmp, snd_config_t *root,
 		       int mode);
 int snd_pcm_conf_generic_id(const char *id);
 
+int snd_pcm_hw_open_fd(snd_pcm_t **pcmp, const char *name, int fd, int mmap_emulation);
+
 #define SND_PCM_HW_PARBIT_ACCESS	(1U << SND_PCM_HW_PARAM_ACCESS)
 #define SND_PCM_HW_PARBIT_FORMAT	(1U << SND_PCM_HW_PARAM_FORMAT)
 #define SND_PCM_HW_PARBIT_SUBFORMAT	(1U << SND_PCM_HW_PARAM_SUBFORMAT)

src/pcm/pcm_mmap.c

@@ -282,6 +282,7 @@ int snd_pcm_channel_info_shm(snd_pcm_t *pcm, snd_pcm_channel_info_t *info,
 	info->addr = 0;
 	info->type = SND_PCM_AREA_SHM;
 	info->u.shm.shmid = shmid;
+	info->u.shm.remove = 0;
 	return 0;
 }	
 
@@ -361,6 +362,7 @@ int snd_pcm_mmap(snd_pcm_t *pcm)
 						return -errno;
 					}
 					i->u.shm.shmid = id;
+					i->u.shm.remove = 1;
 				}
 				ptr = shmat(i->u.shm.shmid, 0, 0);
 				if (ptr == (void*) -1) {
@@ -438,6 +440,14 @@ int snd_pcm_munmap(snd_pcm_t *pcm)
 				SYSERR("shmdt failed");
 				return -errno;
 			}
+			if (i->u.shm.remove) {
+				if (shmctl(i->u.shm.shmid, IPC_RMID, 0) < 0) {
+					SYSERR("shmctl IPC_RMID failed");
+					return -errno;
+				}
+				i->u.shm.shmid = -1;
+				i->u.shm.remove = 0;
+			}
 			break;
 		default:
 			assert(0);

src/pcm/pcm_null.c

@@ -41,7 +41,6 @@ const char *_snd_module_pcm_null = "";
 typedef struct {
 	snd_timestamp_t trigger_tstamp;
 	snd_pcm_state_t state;
-	int shmid;
 	snd_pcm_uframes_t appl_ptr;
 	snd_pcm_uframes_t hw_ptr;
 	int poll_fd;
@@ -81,7 +80,7 @@ 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, null->shmid);
+	return snd_pcm_channel_info_shm(pcm, info, -1);
 }
 
 static int snd_pcm_null_status(snd_pcm_t *pcm, snd_pcm_status_t * status)
@@ -273,28 +272,13 @@ static int snd_pcm_null_sw_params(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_sw_pa
 	return 0;
 }
 
-static int snd_pcm_null_mmap(snd_pcm_t *pcm)
+static int snd_pcm_null_mmap(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
 {
-	snd_pcm_null_t *null = pcm->private_data;
-	if (!(pcm->info & SND_PCM_INFO_MMAP)) {
-		size_t size = snd_pcm_frames_to_bytes(pcm, pcm->buffer_size);
-		int id = shmget(IPC_PRIVATE, size, 0666);
-		if (id < 0) {
-			SYSERR("shmget failed");
-			return -errno;
-		}
-		null->shmid = id;
-	}
 	return 0;
 }
 
-static int snd_pcm_null_munmap(snd_pcm_t *pcm)
+static int snd_pcm_null_munmap(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
 {
-	snd_pcm_null_t *null = pcm->private_data;
-	if (shmctl(null->shmid, IPC_RMID, 0) < 0) {
-		SYSERR("shmctl IPC_RMID failed");
-			return -errno;
-	}
 	return 0;
 }
 

src/pcm/pcm_plugin.c

@@ -178,8 +178,7 @@ int snd_pcm_plugin_sw_params(snd_pcm_t *pcm, snd_pcm_sw_params_t *params)
 
 int snd_pcm_plugin_channel_info(snd_pcm_t *pcm, snd_pcm_channel_info_t *info)
 {
-	snd_pcm_plugin_t *plugin = pcm->private_data;
-	return snd_pcm_channel_info_shm(pcm, info, plugin->shmid);
+	return snd_pcm_channel_info_shm(pcm, info, -1);
 }
 
 snd_pcm_state_t snd_pcm_plugin_state(snd_pcm_t *pcm)
@@ -569,26 +568,13 @@ snd_pcm_sframes_t snd_pcm_plugin_avail_update(snd_pcm_t *pcm)
 	}
 }
 
-int snd_pcm_plugin_mmap(snd_pcm_t *pcm)
+int snd_pcm_plugin_mmap(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
 {
-	snd_pcm_plugin_t *plug = pcm->private_data;
-	size_t size = snd_pcm_frames_to_bytes(pcm, (snd_pcm_sframes_t) pcm->buffer_size);
-	int id = shmget(IPC_PRIVATE, size, 0666);
-	if (id < 0) {
-		SYSERR("shmget failed");
-		return -errno;
-	}
-	plug->shmid = id;
 	return 0;
 }
 
-int snd_pcm_plugin_munmap(snd_pcm_t *pcm)
+int snd_pcm_plugin_munmap(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
 {
-	snd_pcm_plugin_t *plug = pcm->private_data;
-	if (shmctl(plug->shmid, IPC_RMID, 0) < 0) {
-		SYSERR("shmctl IPC_RMID failed");
-			return -errno;
-	}
 	return 0;
 }
 

src/pcm/pcm_plugin.h

@@ -47,7 +47,6 @@ typedef struct {
 	snd_pcm_sframes_t (*client_frames)(snd_pcm_t *pcm, snd_pcm_sframes_t frames);
 	snd_pcm_sframes_t (*slave_frames)(snd_pcm_t *pcm, snd_pcm_sframes_t frames);
 	int (*init)(snd_pcm_t *pcm);
-	int shmid;
 	snd_pcm_uframes_t appl_ptr, hw_ptr;
 	snd_atomic_write_t watom;
 } snd_pcm_plugin_t;	

src/pcm/pcm_share.c

@@ -1322,7 +1322,7 @@ int snd_pcm_share_open(snd_pcm_t **pcmp, const char *name, const char *sname,
 	}
 	err = socketpair(AF_LOCAL, SOCK_STREAM, 0, sd);
 	if (err < 0) {
-		free(pcm);
+		snd_pcm_free(pcm);
 		free(share->slave_channels);
 		free(share);
 		return -errno;
@@ -1348,7 +1348,7 @@ int snd_pcm_share_open(snd_pcm_t **pcmp, const char *name, const char *sname,
 		err = -errno;
 		close(sd[0]);
 		close(sd[1]);
-		free(pcm);
+		snd_pcm_free(pcm);
 		free(share->slave_channels);
 		free(share);
 		return err;
@@ -1369,7 +1369,7 @@ int snd_pcm_share_open(snd_pcm_t **pcmp, const char *name, const char *sname,
 			Pthread_mutex_unlock(&snd_pcm_share_slaves_mutex);
 			close(sd[0]);
 			close(sd[1]);
-			free(pcm);
+			snd_pcm_free(pcm);
 			free(share->slave_channels);
 			free(share);
 			return err;
@@ -1382,7 +1382,7 @@ int snd_pcm_share_open(snd_pcm_t **pcmp, const char *name, const char *sname,
 			snd_pcm_close(spcm);
 			close(sd[0]);
 			close(sd[1]);
-			free(pcm);
+			snd_pcm_free(pcm);
 			free(share->slave_channels);
 			free(share);
 			return err;
@@ -1412,7 +1412,7 @@ int snd_pcm_share_open(snd_pcm_t **pcmp, const char *name, const char *sname,
 					Pthread_mutex_unlock(&slave->mutex);
 					close(sd[0]);
 					close(sd[1]);
-					free(pcm);
+					snd_pcm_free(pcm);
 					free(share->slave_channels);
 					free(share);
 					return -EBUSY;

src/pcm/pcm_symbols.c

@@ -38,6 +38,7 @@ extern const char *_snd_module_pcm_share;
 extern const char *_snd_module_pcm_shm;
 extern const char *_snd_module_pcm_lfloat;
 extern const char *_snd_module_pcm_ladspa;
+extern const char *_snd_module_pcm_dmix;
 
 static const char **snd_pcm_open_objects[] = {
 	&_snd_module_pcm_adpcm,
@@ -57,7 +58,8 @@ static const char **snd_pcm_open_objects[] = {
 	&_snd_module_pcm_share,
 	&_snd_module_pcm_shm,
 	&_snd_module_pcm_lfloat,
-	&_snd_module_pcm_ladspa
+	&_snd_module_pcm_ladspa,
+	&_snd_module_pcm_dmix
 };
 	
 void *snd_pcm_open_symbols(void)