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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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shmsrc: Port to ShmPipe
This commit is contained in:
Olivier Crête
parent
7e90514747
commit
b6bc52f961
2 changed files with 110 additions and 186 deletions
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@ -24,17 +24,10 @@
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#endif
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#include "gstshmsrc.h"
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#include "gstshm.h"
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#include <gst/gst.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <semaphore.h>
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/* signals */
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enum
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@ -46,11 +39,18 @@ enum
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enum
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{
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PROP_0,
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PROP_SHM_NAME
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PROP_SOCKET_PATH
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};
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struct GstShmBuffer
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{
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char *buf;
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GstShmSrc *src;
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};
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GST_DEBUG_CATEGORY_STATIC (shmsrc_debug);
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#define GST_CAT_DEFAULT shmsrc_debug
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static const GstElementDetails gst_shm_src_details =
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GST_ELEMENT_DETAILS ("Shared Memory Source",
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@ -104,18 +104,18 @@ gst_shm_src_class_init (GstShmSrcClass * klass)
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gobject_class->set_property = gst_shm_src_set_property;
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gobject_class->get_property = gst_shm_src_get_property;
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gstbasesrc_class->start = gst_shm_src_start;
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gstbasesrc_class->stop = gst_shm_src_stop;
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gstbasesrc_class->unlock = gst_shm_src_unlock;
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gstbasesrc_class->unlock_stop = gst_shm_src_unlock_stop;
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gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_shm_src_start);
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gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_shm_src_stop);
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gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_shm_src_unlock);
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gstbasesrc_class->unlock_stop = GST_DEBUG_FUNCPTR (gst_shm_src_unlock_stop);
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gstpush_src_class->create = gst_shm_src_create;
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g_object_class_install_property (gobject_class, PROP_SHM_NAME,
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g_param_spec_string ("shm-name",
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"Name of the shared memory area",
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"The name of the shared memory area that the source can read from",
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NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_SOCKET_PATH,
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g_param_spec_string ("socket-path",
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"Path to the control socket",
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"The path to the control socket used to control the shared memory"
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" transport", NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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GST_DEBUG_CATEGORY_INIT (shmsrc_debug, "shmsrc", 0, "Shared Memory Source");
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}
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@ -123,13 +123,6 @@ gst_shm_src_class_init (GstShmSrcClass * klass)
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static void
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gst_shm_src_init (GstShmSrc * self, GstShmSrcClass * g_class)
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{
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gst_base_src_set_live (GST_BASE_SRC (self), TRUE);
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gst_base_src_set_do_timestamp (GST_BASE_SRC (self), TRUE);
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gst_pad_use_fixed_caps (GST_BASE_SRC_PAD (self));
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self->fd = -1;
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self->shm_area = MAP_FAILED;
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}
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@ -140,10 +133,15 @@ gst_shm_src_set_property (GObject * object, guint prop_id,
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GstShmSrc *self = GST_SHM_SRC (object);
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switch (prop_id) {
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case PROP_SHM_NAME:
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case PROP_SOCKET_PATH:
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GST_OBJECT_LOCK (object);
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g_free (self->shm_name);
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self->shm_name = g_value_dup_string (value);
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if (self->pipe) {
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GST_WARNING_OBJECT (object, "Can not modify socket path while the "
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"element is playing");
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} else {
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g_free (self->socket_path);
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self->socket_path = g_value_dup_string (value);
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}
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GST_OBJECT_UNLOCK (object);
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break;
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default:
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@ -159,9 +157,9 @@ gst_shm_src_get_property (GObject * object, guint prop_id,
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GstShmSrc *self = GST_SHM_SRC (object);
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switch (prop_id) {
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case PROP_SHM_NAME:
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case PROP_SOCKET_PATH:
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GST_OBJECT_LOCK (object);
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g_value_set_string (value, self->shm_name);
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g_value_set_string (value, self->socket_path);
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GST_OBJECT_UNLOCK (object);
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break;
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default:
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@ -175,45 +173,28 @@ gst_shm_src_start (GstBaseSrc * bsrc)
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{
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GstShmSrc *self = GST_SHM_SRC (bsrc);
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g_return_val_if_fail (self->fd == -1, FALSE);
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if (!self->socket_path) {
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GST_ELEMENT_ERROR (bsrc, RESOURCE, NOT_FOUND,
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("No path specified for socket."), (NULL));
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return FALSE;
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}
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GST_OBJECT_LOCK (self);
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if (!self->shm_name) {
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GST_OBJECT_UNLOCK (self);
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GST_ERROR_OBJECT (self, "Must set the name of the shm area first");
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GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
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("One must specify the name of the shm area"),
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("shm-name property not set"));
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return FALSE;
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}
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self->fd = shm_open (self->shm_name, O_RDWR, 0);
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if (self->fd < 0) {
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GST_OBJECT_UNLOCK (self);
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GST_ERROR_OBJECT (self, "Could not open shm area: %s", strerror (errno));
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GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
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("Could not open the shm area"),
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("shm_open failed (%d): %s", errno, strerror (errno)));
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return FALSE;
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}
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self->pipe = sp_client_open (self->socket_path);
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GST_OBJECT_UNLOCK (self);
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self->shm_area_len = sizeof (struct GstShmHeader);
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self->shm_area = mmap (NULL, self->shm_area_len, PROT_READ | PROT_WRITE,
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MAP_SHARED, self->fd, 0);
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if (self->shm_area == MAP_FAILED) {
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GST_ERROR_OBJECT (self, "Could not map shm area");
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GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
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("Could not map memory area"),
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("mmap failed (%d): %s", errno, strerror (errno)));
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gst_shm_src_stop (bsrc);
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if (!self->pipe) {
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GST_ELEMENT_ERROR (bsrc, RESOURCE, OPEN_READ_WRITE,
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("Could not open socket: %d %s", errno, strerror (errno)), (NULL));
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return FALSE;
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}
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self->poll = gst_poll_new (TRUE);
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gst_poll_fd_init (&self->pollfd);
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self->pollfd.fd = sp_get_fd (self->pipe);
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gst_poll_add_fd (self->poll, &self->pollfd);
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gst_poll_fd_ctl_read (self->poll, &self->pollfd, TRUE);
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return TRUE;
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}
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@ -222,151 +203,90 @@ gst_shm_src_stop (GstBaseSrc * bsrc)
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{
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GstShmSrc *self = GST_SHM_SRC (bsrc);
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if (self->fd >= 0)
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close (self->fd);
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self->fd = -1;
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GST_DEBUG_OBJECT (self, "Stopping %p", self);
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if (self->shm_area != MAP_FAILED)
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munmap (self->shm_area, self->shm_area_len);
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self->shm_area_len = 0;
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self->shm_area = MAP_FAILED;
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sp_close (self->pipe);
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self->pipe = NULL;
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gst_poll_free (self->poll);
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self->poll = NULL;
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return TRUE;
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}
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static gboolean
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resize_area (GstShmSrc * self)
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static void
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free_buffer (gpointer data)
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{
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while ((sizeof (struct GstShmHeader) + self->shm_area->caps_size +
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self->shm_area->buffer_size) > self->shm_area_len) {
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size_t new_size = (sizeof (struct GstShmHeader) +
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self->shm_area->caps_size + self->shm_area->buffer_size);
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struct GstShmBuffer *gsb = data;
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g_return_if_fail (gsb->src->pipe != NULL);
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SHM_UNLOCK (self->shm_area);
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if (munmap (self->shm_area, self->shm_area_len)) {
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GST_ERROR_OBJECT (self, "Could not unmap shared area");
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GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
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("Could not unmap memory area"),
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("munmap failed (%d): %s", errno, strerror (errno)));
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return FALSE;
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}
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GST_LOG ("Freeing buffer %p", gsb->buf);
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self->shm_area = mmap (NULL, new_size, PROT_READ | PROT_WRITE,
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MAP_SHARED, self->fd, 0);
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sp_client_recv_finish (gsb->src->pipe, gsb->buf);
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if (!self->shm_area) {
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GST_ERROR_OBJECT (self, "Could not remap shared area");
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GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
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("Could not map memory area"),
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("mmap failed (%d): %s", errno, strerror (errno)));
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return FALSE;
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}
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self->shm_area_len = new_size;
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SHM_LOCK (self->shm_area);
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}
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return TRUE;
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gst_object_unref (gsb->src);
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g_slice_free (struct GstShmBuffer, gsb);
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}
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static GstFlowReturn
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gst_shm_src_create (GstPushSrc * psrc, GstBuffer ** outbuf)
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{
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GstShmSrc *self = GST_SHM_SRC (psrc);
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gchar *buf = NULL;
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int rv = 0;
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struct GstShmBuffer *gsb;
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if (self->unlocked)
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return GST_FLOW_WRONG_STATE;
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g_return_val_if_fail (self->shm_area != MAP_FAILED, GST_FLOW_ERROR);
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SHM_LOCK (self->shm_area);
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if (self->unlocked)
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goto unlocked;
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if (self->shm_area->eos)
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goto eos;
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while (self->buffer_gen == self->shm_area->buffer_gen) {
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SHM_UNLOCK (self->shm_area);
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if (self->unlocked)
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return GST_FLOW_WRONG_STATE;
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GST_LOG_OBJECT (self, "Waiting for next buffer");
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sem_wait (&self->shm_area->notification);
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if (self->unlocked)
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return GST_FLOW_WRONG_STATE;
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SHM_LOCK (self->shm_area);
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}
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if (self->unlocked)
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goto eos;
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if (!resize_area (self)) {
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return GST_FLOW_ERROR;
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}
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if (self->caps_gen != self->shm_area->caps_gen) {
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GstCaps *caps;
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GST_DEBUG_OBJECT (self, "Got new caps: %s",
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GST_SHM_CAPS_BUFFER (self->shm_area));
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caps = gst_caps_from_string (GST_SHM_CAPS_BUFFER (self->shm_area));
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self->caps_gen = self->shm_area->caps_gen;
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if (!caps) {
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SHM_UNLOCK (self->shm_area);
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GST_ERROR_OBJECT (self, "Could not read caps");
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do {
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if (gst_poll_wait (self->poll, GST_CLOCK_TIME_NONE) < 0) {
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if (errno == EBUSY)
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return GST_FLOW_WRONG_STATE;
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GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"),
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("Poll failed on fd: %s", strerror (errno)));
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return GST_FLOW_ERROR;
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}
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if (!gst_pad_set_caps (GST_BASE_SRC_PAD (psrc), caps)) {
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SHM_UNLOCK (self->shm_area);
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return GST_FLOW_NOT_NEGOTIATED;
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if (self->unlocked)
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return GST_FLOW_WRONG_STATE;
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if (gst_poll_fd_has_closed (self->poll, &self->pollfd)) {
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GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"),
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("Control socket has closed"));
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return GST_FLOW_ERROR;
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}
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}
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GST_LOG_OBJECT (self, "Create new buffer of size %u",
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self->shm_area->buffer_size);
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if (gst_poll_fd_has_error (self->poll, &self->pollfd)) {
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GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"),
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("Control socket has error"));
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return GST_FLOW_ERROR;
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}
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*outbuf = gst_buffer_new_and_alloc (self->shm_area->buffer_size);
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if (gst_poll_fd_can_read (self->poll, &self->pollfd)) {
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buf = NULL;
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GST_LOG_OBJECT (self, "Reading from pipe");
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rv = sp_client_recv (self->pipe, &buf);
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if (rv < 0) {
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GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"),
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("Error reading control data: %d", rv));
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return GST_FLOW_ERROR;
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}
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}
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} while (buf == NULL);
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memcpy (GST_BUFFER_DATA (*outbuf), GST_SHM_BUFFER (self->shm_area),
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GST_BUFFER_SIZE (*outbuf));
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GST_LOG_OBJECT (self, "Got buffer %p of size %d", buf, rv);
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// GST_BUFFER_TIMESTAMP (*outbuf) = self->shm_area->timestamp;
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GST_BUFFER_DURATION (*outbuf) = self->shm_area->duration;
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GST_BUFFER_OFFSET (*outbuf) = self->shm_area->offset;
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GST_BUFFER_OFFSET_END (*outbuf) = self->shm_area->offset_end;
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GST_BUFFER_FLAGS (*outbuf) = self->shm_area->flags;
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gsb = g_slice_new0 (struct GstShmBuffer);
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gsb->buf = buf;
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gsb->src = gst_object_ref (self);
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if (self->buffer_gen + 1 != self->shm_area->buffer_gen) {
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GST_WARNING_OBJECT (self, "Skipped %u buffers, setting DISCONT flag",
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self->shm_area->buffer_gen - self->buffer_gen - 1);
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GST_BUFFER_FLAG_SET (*outbuf, GST_BUFFER_FLAG_DISCONT);
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}
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self->buffer_gen = self->shm_area->buffer_gen;
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SHM_UNLOCK (self->shm_area);
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gst_buffer_set_caps (*outbuf, GST_PAD_CAPS (GST_BASE_SRC_PAD (psrc)));
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*outbuf = gst_buffer_new ();
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GST_BUFFER_FLAG_SET (*outbuf, GST_BUFFER_FLAG_READONLY);
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GST_BUFFER_DATA (*outbuf) = (guint8 *) buf;
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GST_BUFFER_SIZE (*outbuf) = rv;
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GST_BUFFER_MALLOCDATA (*outbuf) = (guint8 *) gsb;
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GST_BUFFER_FREE_FUNC (*outbuf) = free_buffer;
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return GST_FLOW_OK;
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eos:
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SHM_UNLOCK (self->shm_area);
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return GST_FLOW_UNEXPECTED;
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unlocked:
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SHM_UNLOCK (self->shm_area);
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return GST_FLOW_WRONG_STATE;
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}
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static gboolean
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@ -376,8 +296,8 @@ gst_shm_src_unlock (GstBaseSrc * bsrc)
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self->unlocked = TRUE;
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if (self->shm_area != MAP_FAILED)
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sem_post (&self->shm_area->notification);
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if (self->poll)
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gst_poll_set_flushing (self->poll, TRUE);
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return TRUE;
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}
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@ -389,5 +309,8 @@ gst_shm_src_unlock_stop (GstBaseSrc * bsrc)
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self->unlocked = FALSE;
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if (self->poll)
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gst_poll_set_flushing (self->poll, FALSE);
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return TRUE;
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}
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@ -26,6 +26,8 @@
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#include <gst/base/gstpushsrc.h>
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#include <gst/base/gstbasesrc.h>
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#include "shmpipe.h"
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G_BEGIN_DECLS
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#define GST_TYPE_SHM_SRC \
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(gst_shm_src_get_type())
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@ -44,15 +46,14 @@ struct _GstShmSrc
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{
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GstPushSrc element;
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gchar *shm_name;
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gchar *socket_path;
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int fd;
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struct GstShmHeader *shm_area;
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size_t shm_area_len;
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ShmPipe *pipe;
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GstPoll *poll;
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GstPollFD pollfd;
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guint caps_gen;
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guint buffer_gen;
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GstFlowReturn flow_return;
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gboolean unlocked;
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};
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