gstreamer/subprojects/gst-plugins-bad/sys/win32ipc/gstwin32ipcvideosrc.cpp

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/* GStreamer
* Copyright (C) 2022 Seungha Yang <seungha@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-win32ipcvideosrc
* @title: win32ipcvideosrc
* @short_description: Windows shared memory video source
*
* win32ipcvideosrc receives raw video frames from win32ipcvideosink
* and outputs the received video frames
*
* ## Example launch line
* ```
* gst-launch-1.0 win32ipcvideosrc ! queue ! videoconvert ! d3d11videosink
* ```
*
* Since: 1.22
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstwin32ipcvideosrc.h"
#include "gstwin32ipcutils.h"
#include "protocol/win32ipcpipeclient.h"
#include <string>
GST_DEBUG_CATEGORY_STATIC (gst_win32_ipc_video_src_debug);
#define GST_CAT_DEFAULT gst_win32_ipc_video_src_debug
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (GST_VIDEO_FORMATS_ALL)));
enum
{
PROP_0,
PROP_PIPE_NAME,
PROP_PROCESSING_DEADLINE,
};
#define DEFAULT_PIPE_NAME "\\\\.\\pipe\\gst.win32.ipc.video"
#define DEFAULT_PROCESSING_DEADLINE (20 * GST_MSECOND)
struct _GstWin32IpcVideoSrc
{
GstBaseSrc parent;
GstVideoInfo info;
Win32IpcPipeClient *pipe;
GstCaps *caps;
gboolean flushing;
SRWLOCK lock;
gboolean have_video_meta;
gsize offset[GST_VIDEO_MAX_PLANES];
gint stride[GST_VIDEO_MAX_PLANES];
LARGE_INTEGER frequency;
GstBufferPool *pool;
/* properties */
gchar *pipe_name;
GstClockTime processing_deadline;
};
static void gst_win32_ipc_video_src_finalize (GObject * object);
static void gst_win32_ipc_video_src_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_win32_video_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstClock *gst_win32_video_src_provide_clock (GstElement * elem);
static gboolean gst_win32_ipc_video_src_start (GstBaseSrc * src);
static gboolean gst_win32_ipc_video_src_stop (GstBaseSrc * src);
static gboolean gst_win32_ipc_video_src_unlock (GstBaseSrc * src);
static gboolean gst_win32_ipc_video_src_unlock_stop (GstBaseSrc * src);
static gboolean gst_win32_ipc_video_src_query (GstBaseSrc * src,
GstQuery * query);
static gboolean gst_win32_ipc_video_src_decide_allocation (GstBaseSrc * src,
GstQuery * query);
static GstFlowReturn gst_win32_ipc_video_src_create (GstBaseSrc * src,
guint64 offset, guint size, GstBuffer ** buf);
#define gst_win32_ipc_video_src_parent_class parent_class
G_DEFINE_TYPE (GstWin32IpcVideoSrc, gst_win32_ipc_video_src, GST_TYPE_BASE_SRC);
static void
gst_win32_ipc_video_src_class_init (GstWin32IpcVideoSrcClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstBaseSrcClass *src_class = GST_BASE_SRC_CLASS (klass);
object_class->finalize = gst_win32_ipc_video_src_finalize;
object_class->set_property = gst_win32_ipc_video_src_set_property;
object_class->get_property = gst_win32_video_src_get_property;
g_object_class_install_property (object_class, PROP_PIPE_NAME,
g_param_spec_string ("pipe-name", "Pipe Name",
"The name of Win32 named pipe to communicate with server. "
"Validation of the pipe name is caller's responsibility",
DEFAULT_PIPE_NAME, (GParamFlags) (G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS | GST_PARAM_MUTABLE_READY)));
g_object_class_install_property (object_class, PROP_PROCESSING_DEADLINE,
g_param_spec_uint64 ("processing-deadline", "Processing deadline",
"Maximum processing time for a buffer in nanoseconds", 0, G_MAXUINT64,
DEFAULT_PROCESSING_DEADLINE, (GParamFlags) (G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS | GST_PARAM_MUTABLE_PLAYING)));
gst_element_class_set_static_metadata (element_class,
"Win32 IPC Video Source", "Source/Video",
"Receive video frames from the win32ipcvideosink",
"Seungha Yang <seungha@centricular.com>");
gst_element_class_add_static_pad_template (element_class, &src_template);
element_class->provide_clock =
GST_DEBUG_FUNCPTR (gst_win32_video_src_provide_clock);
src_class->start = GST_DEBUG_FUNCPTR (gst_win32_ipc_video_src_start);
src_class->stop = GST_DEBUG_FUNCPTR (gst_win32_ipc_video_src_stop);
src_class->unlock = GST_DEBUG_FUNCPTR (gst_win32_ipc_video_src_unlock);
src_class->unlock_stop =
GST_DEBUG_FUNCPTR (gst_win32_ipc_video_src_unlock_stop);
src_class->query = GST_DEBUG_FUNCPTR (gst_win32_ipc_video_src_query);
src_class->decide_allocation =
GST_DEBUG_FUNCPTR (gst_win32_ipc_video_src_decide_allocation);
src_class->create = GST_DEBUG_FUNCPTR (gst_win32_ipc_video_src_create);
GST_DEBUG_CATEGORY_INIT (gst_win32_ipc_video_src_debug, "win32ipcvideosrc",
0, "win32ipcvideosrc");
}
static void
gst_win32_ipc_video_src_init (GstWin32IpcVideoSrc * self)
{
gst_base_src_set_format (GST_BASE_SRC (self), GST_FORMAT_TIME);
gst_base_src_set_live (GST_BASE_SRC (self), TRUE);
self->pipe_name = g_strdup (DEFAULT_PIPE_NAME);
self->processing_deadline = DEFAULT_PROCESSING_DEADLINE;
QueryPerformanceFrequency (&self->frequency);
GST_OBJECT_FLAG_SET (self, GST_ELEMENT_FLAG_PROVIDE_CLOCK);
GST_OBJECT_FLAG_SET (self, GST_ELEMENT_FLAG_REQUIRE_CLOCK);
}
static void
gst_win32_ipc_video_src_finalize (GObject * object)
{
GstWin32IpcVideoSrc *self = GST_WIN32_IPC_VIDEO_SRC (object);
g_free (self->pipe_name);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_win32_ipc_video_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstWin32IpcVideoSrc *self = GST_WIN32_IPC_VIDEO_SRC (object);
switch (prop_id) {
case PROP_PIPE_NAME:
GST_OBJECT_LOCK (self);
g_free (self->pipe_name);
self->pipe_name = g_value_dup_string (value);
if (!self->pipe_name)
self->pipe_name = g_strdup (DEFAULT_PIPE_NAME);
GST_OBJECT_UNLOCK (self);
break;
case PROP_PROCESSING_DEADLINE:
{
GstClockTime prev_val, new_val;
GST_OBJECT_LOCK (self);
prev_val = self->processing_deadline;
new_val = g_value_get_uint64 (value);
self->processing_deadline = new_val;
GST_OBJECT_UNLOCK (self);
if (prev_val != new_val) {
GST_DEBUG_OBJECT (self, "Posting latency message");
gst_element_post_message (GST_ELEMENT_CAST (self),
gst_message_new_latency (GST_OBJECT_CAST (self)));
}
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_win32_video_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstWin32IpcVideoSrc *self = GST_WIN32_IPC_VIDEO_SRC (object);
switch (prop_id) {
case PROP_PIPE_NAME:
GST_OBJECT_LOCK (self);
g_value_set_string (value, self->pipe_name);
GST_OBJECT_UNLOCK (self);
break;
case PROP_PROCESSING_DEADLINE:
GST_OBJECT_LOCK (self);
g_value_set_uint64 (value, self->processing_deadline);
GST_OBJECT_UNLOCK (self);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstClock *
gst_win32_video_src_provide_clock (GstElement * elem)
{
return gst_system_clock_obtain ();
}
static gboolean
gst_win32_ipc_video_src_start (GstBaseSrc * src)
{
GstWin32IpcVideoSrc *self = GST_WIN32_IPC_VIDEO_SRC (src);
GST_DEBUG_OBJECT (self, "Start");
gst_video_info_init (&self->info);
return TRUE;
}
static gboolean
gst_win32_ipc_video_src_stop (GstBaseSrc * src)
{
GstWin32IpcVideoSrc *self = GST_WIN32_IPC_VIDEO_SRC (src);
GST_DEBUG_OBJECT (self, "Stop");
if (self->pipe) {
win32_ipc_pipe_client_stop (self->pipe);
g_clear_pointer (&self->pipe, win32_ipc_pipe_client_unref);
}
gst_clear_caps (&self->caps);
if (self->pool) {
gst_buffer_pool_set_active (self->pool, FALSE);
gst_clear_object (&self->pool);
}
return TRUE;
}
static gboolean
gst_win32_ipc_video_src_unlock (GstBaseSrc * src)
{
GstWin32IpcVideoSrc *self = GST_WIN32_IPC_VIDEO_SRC (src);
GST_DEBUG_OBJECT (self, "Unlock");
AcquireSRWLockExclusive (&self->lock);
self->flushing = TRUE;
if (self->pipe)
win32_ipc_pipe_client_set_flushing (self->pipe, TRUE);
ReleaseSRWLockExclusive (&self->lock);
return TRUE;
}
static gboolean
gst_win32_ipc_video_src_unlock_stop (GstBaseSrc * src)
{
GstWin32IpcVideoSrc *self = GST_WIN32_IPC_VIDEO_SRC (src);
GST_DEBUG_OBJECT (self, "Unlock stop");
AcquireSRWLockExclusive (&self->lock);
self->flushing = FALSE;
if (self->pipe)
win32_ipc_pipe_client_set_flushing (self->pipe, FALSE);
ReleaseSRWLockExclusive (&self->lock);
return TRUE;
}
static gboolean
gst_win32_ipc_video_src_query (GstBaseSrc * src, GstQuery * query)
{
GstWin32IpcVideoSrc *self = GST_WIN32_IPC_VIDEO_SRC (src);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:
{
GST_OBJECT_LOCK (self);
if (GST_CLOCK_TIME_IS_VALID (self->processing_deadline)) {
gst_query_set_latency (query, TRUE, self->processing_deadline,
/* pipe server can hold up to 5 memory objects */
5 * self->processing_deadline);
} else {
gst_query_set_latency (query, TRUE, 0, 0);
}
GST_OBJECT_UNLOCK (self);
return TRUE;
}
default:
break;
}
return GST_BASE_SRC_CLASS (parent_class)->query (src, query);
}
static gboolean
gst_win32_ipc_video_src_decide_allocation (GstBaseSrc * src, GstQuery * query)
{
GstWin32IpcVideoSrc *self = GST_WIN32_IPC_VIDEO_SRC (src);
gboolean ret;
ret = GST_BASE_SRC_CLASS (parent_class)->decide_allocation (src, query);
if (!ret)
return ret;
self->have_video_meta = gst_query_find_allocation_meta (query,
GST_VIDEO_META_API_TYPE, nullptr);
GST_DEBUG_OBJECT (self, "Downstream supports video meta: %d",
self->have_video_meta);
return TRUE;
}
static GstCaps *
gst_win32_ipc_video_src_update_info_and_get_caps (GstWin32IpcVideoSrc * self,
const Win32IpcVideoInfo * info)
{
GstVideoInfo vinfo;
gst_video_info_set_format (&vinfo, (GstVideoFormat) info->format,
info->width, info->height);
vinfo.fps_n = info->fps_n;
vinfo.fps_d = info->fps_d;
vinfo.par_n = info->par_n;
vinfo.par_d = info->par_d;
if (!self->caps || !gst_video_info_is_equal (&self->info, &vinfo)) {
self->info = vinfo;
return gst_video_info_to_caps (&vinfo);
}
return nullptr;
}
static gboolean
gst_win32_ipc_ensure_fallback_pool (GstWin32IpcVideoSrc * self)
{
GstStructure *config;
if (self->pool)
return TRUE;
self->pool = gst_video_buffer_pool_new ();
config = gst_buffer_pool_get_config (self->pool);
gst_buffer_pool_config_set_params (config, self->caps,
GST_VIDEO_INFO_SIZE (&self->info), 0, 0);
if (!gst_buffer_pool_set_config (self->pool, config)) {
GST_ERROR_OBJECT (self, "Couldn't set config");
goto error;
}
if (!gst_buffer_pool_set_active (self->pool, TRUE)) {
GST_ERROR_OBJECT (self, "Couldn't set active");
goto error;
}
return TRUE;
error:
gst_clear_object (&self->pool);
return FALSE;
}
struct MmfReleaseData
{
Win32IpcPipeClient *pipe;
Win32IpcMmf *mmf;
};
static void
gst_win32_ipc_video_src_release_mmf (MmfReleaseData * data)
{
win32_ipc_pipe_client_release_mmf (data->pipe, data->mmf);
win32_ipc_pipe_client_unref (data->pipe);
delete data;
}
static GstFlowReturn
gst_win32_ipc_video_src_create (GstBaseSrc * src, guint64 offset, guint size,
GstBuffer ** buf)
{
GstWin32IpcVideoSrc *self = GST_WIN32_IPC_VIDEO_SRC (src);
GstCaps *caps;
Win32IpcMmf *mmf;
Win32IpcVideoInfo info;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *buffer;
GstClock *clock;
GstClockTime pts;
GstClockTime base_time;
GstClockTime now_qpc;
GstClockTime now_gst;
LARGE_INTEGER cur_time;
gboolean is_qpc = TRUE;
gboolean need_video_meta = FALSE;
AcquireSRWLockExclusive (&self->lock);
if (self->flushing) {
ReleaseSRWLockExclusive (&self->lock);
return GST_FLOW_FLUSHING;
}
if (!self->pipe) {
self->pipe = win32_ipc_pipe_client_new (self->pipe_name);
if (!self->pipe) {
ReleaseSRWLockExclusive (&self->lock);
GST_ERROR_OBJECT (self, "Couldn't create pipe");
return GST_FLOW_ERROR;
}
}
ReleaseSRWLockExclusive (&self->lock);
if (!win32_ipc_pipe_client_get_mmf (self->pipe, &mmf, &info)) {
AcquireSRWLockExclusive (&self->lock);
if (self->flushing) {
ret = GST_FLOW_FLUSHING;
GST_DEBUG_OBJECT (self, "Flushing");
} else {
ret = GST_FLOW_EOS;
GST_WARNING_OBJECT (self, "Couldn't get buffer from server");
}
ReleaseSRWLockExclusive (&self->lock);
return ret;
}
caps = gst_win32_ipc_video_src_update_info_and_get_caps (self, &info);
for (guint i = 0; i < GST_VIDEO_INFO_N_PLANES (&self->info); i++) {
self->offset[i] = (gsize) info.offset[i];
self->stride[i] = (gint) info.stride[i];
if (self->offset[i] != self->info.offset[i] ||
self->stride[i] != self->info.stride[i]) {
need_video_meta = TRUE;
}
}
if (caps) {
if (self->pool) {
gst_buffer_pool_set_active (self->pool, FALSE);
gst_clear_object (&self->pool);
}
gst_caps_replace (&self->caps, caps);
GST_DEBUG_OBJECT (self, "Setting caps %" GST_PTR_FORMAT, caps);
gst_pad_set_caps (GST_BASE_SRC_PAD (src), caps);
gst_caps_unref (caps);
}
if (self->have_video_meta || !need_video_meta) {
MmfReleaseData *data = new MmfReleaseData ();
data->pipe = win32_ipc_pipe_client_ref (self->pipe);
data->mmf = mmf;
buffer = gst_buffer_new_wrapped_full (GST_MEMORY_FLAG_READONLY,
win32_ipc_mmf_get_raw (mmf), win32_ipc_mmf_get_size (mmf),
0, win32_ipc_mmf_get_size (mmf), data,
(GDestroyNotify) gst_win32_ipc_video_src_release_mmf);
if (self->have_video_meta) {
gst_buffer_add_video_meta_full (buffer,
GST_VIDEO_FRAME_FLAG_NONE, GST_VIDEO_INFO_FORMAT (&self->info),
GST_VIDEO_INFO_WIDTH (&self->info),
GST_VIDEO_INFO_HEIGHT (&self->info),
GST_VIDEO_INFO_N_PLANES (&self->info), self->offset, self->stride);
}
} else {
GstVideoFrame mmf_frame, frame;
if (!gst_win32_ipc_ensure_fallback_pool (self)) {
win32_ipc_mmf_unref (mmf);
return GST_FLOW_ERROR;
}
ret = gst_buffer_pool_acquire_buffer (self->pool, &buffer, nullptr);
if (ret != GST_FLOW_OK) {
GST_ERROR_OBJECT (self, "Couldn't acquire buffer");
win32_ipc_mmf_unref (mmf);
return GST_FLOW_ERROR;
}
gst_video_frame_map (&frame, &self->info, buffer, GST_MAP_WRITE);
mmf_frame.info = self->info;
for (guint i = 0; i < GST_VIDEO_FRAME_N_PLANES (&frame); i++) {
mmf_frame.info.offset[i] = self->offset[i];
mmf_frame.info.stride[i] = self->stride[i];
mmf_frame.data[i] = (guint8 *) win32_ipc_mmf_get_raw (mmf) +
self->offset[i];
}
gst_video_frame_copy (&frame, &mmf_frame);
gst_video_frame_unmap (&frame);
win32_ipc_mmf_unref (mmf);
}
QueryPerformanceCounter (&cur_time);
now_qpc = gst_util_uint64_scale (cur_time.QuadPart, GST_SECOND,
self->frequency.QuadPart);
clock = gst_element_get_clock (GST_ELEMENT_CAST (self));
now_gst = gst_clock_get_time (clock);
base_time = GST_ELEMENT_CAST (self)->base_time;
is_qpc = gst_win32_ipc_clock_is_qpc (clock);
gst_object_unref (clock);
if (!is_qpc) {
GstClockTimeDiff now_pts = now_gst - base_time + info.qpc - now_qpc;
if (now_pts >= 0)
pts = now_pts;
else
pts = 0;
} else {
if (info.qpc >= base_time) {
/* Our base_time is also QPC */
pts = info.qpc - base_time;
} else {
GST_WARNING_OBJECT (self, "Server QPC is smaller than our QPC base time");
pts = 0;
}
}
GST_BUFFER_PTS (buffer) = pts;
GST_BUFFER_DTS (buffer) = GST_CLOCK_TIME_NONE;
GST_BUFFER_DURATION (buffer) = GST_CLOCK_TIME_NONE;
*buf = buffer;
return GST_FLOW_OK;
}