| # Copyright 2019 Google LLC |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # https://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| import cairo |
| import collections |
| import contextlib |
| import ctypes |
| import numpy |
| import os |
| import threading |
| import time |
| |
| import gi |
| gi.require_version('Gdk', '3.0') |
| gi.require_version('GObject', '2.0') |
| gi.require_version('GLib', '2.0') |
| gi.require_version('Gst', '1.0') |
| gi.require_version('GstAllocators', '1.0') |
| gi.require_version('GstBase', '1.0') |
| gi.require_version('GstGL', '1.0') |
| gi.require_version('GstVideo', '1.0') |
| from gi.repository import Gdk, GObject, GLib, Gst, GstAllocators, GstBase, GstGL, GstVideo |
| |
| from OpenGL.arrays.arraydatatype import ArrayDatatype |
| from OpenGL.GLES3 import ( |
| glActiveTexture, glBindBuffer, glBindTexture, glBindVertexArray, glBlendEquation, glBlendFunc, |
| glBufferData, glDeleteBuffers, glDeleteVertexArrays, glDisable, glDrawElements, glEnable, |
| glEnableVertexAttribArray, glGenBuffers, glGenVertexArrays, glGetUniformLocation, |
| glUniformMatrix4fv, glVertexAttribPointer, glViewport) |
| from OpenGL.GLES3 import ( |
| GL_ARRAY_BUFFER, GL_BLEND, GL_ELEMENT_ARRAY_BUFFER, GL_FALSE, GL_FLOAT, GL_FUNC_ADD, |
| GL_ONE_MINUS_SRC_ALPHA, GL_SRC_ALPHA, GL_STATIC_DRAW, GL_TEXTURE0, GL_TEXTURE_2D, |
| GL_TRIANGLES, GL_UNSIGNED_SHORT, GL_VERTEX_SHADER) |
| |
| # Gst.Buffer.map(Gst.MapFlags.WRITE) is broken, this is a workaround. See |
| # http://lifestyletransfer.com/how-to-make-gstreamer-buffer-writable-in-python/ |
| # https://gitlab.gnome.org/GNOME/gobject-introspection/issues/69 |
| class GstMapInfo(ctypes.Structure): |
| _fields_ = [('memory', ctypes.c_void_p), # GstMemory *memory |
| ('flags', ctypes.c_int), # GstMapFlags flags |
| ('data', ctypes.POINTER(ctypes.c_byte)), # guint8 *data |
| ('size', ctypes.c_size_t), # gsize size |
| ('maxsize', ctypes.c_size_t), # gsize maxsize |
| ('user_data', ctypes.c_void_p * 4), # gpointer user_data[4] |
| ('_gst_reserved', ctypes.c_void_p * 4)] # GST_PADDING |
| |
| # ctypes imports for missing or broken introspection APIs. |
| libgst = ctypes.CDLL('libgstreamer-1.0.so.0') |
| GST_MAP_INFO_POINTER = ctypes.POINTER(GstMapInfo) |
| libgst.gst_buffer_map.argtypes = [ctypes.c_void_p, GST_MAP_INFO_POINTER, ctypes.c_int] |
| libgst.gst_buffer_map.restype = ctypes.c_int |
| libgst.gst_buffer_unmap.argtypes = [ctypes.c_void_p, GST_MAP_INFO_POINTER] |
| libgst.gst_buffer_unmap.restype = None |
| libgst.gst_mini_object_is_writable.argtypes = [ctypes.c_void_p] |
| libgst.gst_mini_object_is_writable.restype = ctypes.c_int |
| libgst.gst_context_writable_structure.restype = ctypes.c_void_p |
| libgst.gst_context_writable_structure.argtypes = [ctypes.c_void_p] |
| libgst.gst_structure_set.restype = ctypes.c_void_p |
| libgst.gst_structure_set.argtypes = [ctypes.c_void_p, ctypes.c_char_p, |
| ctypes.c_void_p, ctypes.c_void_p, ctypes.c_void_p] |
| |
| libgstgl = ctypes.CDLL('libgstgl-1.0.so.0') |
| libgstgl.gst_gl_memory_get_texture_id.argtypes = [ctypes.c_void_p] |
| libgstgl.gst_gl_memory_get_texture_id.restype = ctypes.c_uint |
| libgstgl.gst_gl_sync_meta_wait_cpu.argtypes = [ctypes.c_void_p, ctypes.c_void_p] |
| libgstgl.gst_gl_sync_meta_wait_cpu.restype = None |
| |
| libcairo = ctypes.CDLL('libcairo.so.2') |
| libcairo.cairo_image_surface_create_for_data.restype = ctypes.c_void_p |
| libcairo.cairo_image_surface_create_for_data.argtypes = [ctypes.c_void_p, |
| ctypes.c_int, ctypes.c_int, ctypes.c_int, ctypes.c_int] |
| libcairo.cairo_surface_flush.restype = None |
| libcairo.cairo_surface_flush.argtypes = [ctypes.c_void_p] |
| libcairo.cairo_surface_destroy.restype = None |
| libcairo.cairo_surface_destroy.argtypes = [ctypes.c_void_p] |
| libcairo.cairo_format_stride_for_width.restype = ctypes.c_int |
| libcairo.cairo_format_stride_for_width.argtypes = [ctypes.c_int, ctypes.c_int] |
| libcairo.cairo_create.restype = ctypes.c_void_p |
| libcairo.cairo_create.argtypes = [ctypes.c_void_p] |
| libcairo.cairo_destroy.restype = None |
| libcairo.cairo_destroy.argtypes = [ctypes.c_void_p] |
| |
| librsvg = ctypes.CDLL('librsvg-2.so.2') |
| librsvg.rsvg_handle_new_from_data.restype = ctypes.c_void_p |
| librsvg.rsvg_handle_new_from_data.argtypes = [ctypes.c_char_p, ctypes.c_size_t, ctypes.c_void_p] |
| librsvg.rsvg_handle_render_cairo.restype = ctypes.c_bool |
| librsvg.rsvg_handle_render_cairo.argtypes = [ctypes.c_void_p, ctypes.c_void_p] |
| librsvg.rsvg_handle_close.restype = ctypes.c_bool |
| librsvg.rsvg_handle_close.argtypes = [ctypes.c_void_p, ctypes.c_void_p] |
| |
| libgobject = ctypes.CDLL('libgobject-2.0.so.0') |
| libgobject.g_object_unref.restype = None |
| libgobject.g_object_unref.argtypes = [ctypes.c_void_p] |
| |
| libgdk = ctypes.CDLL('libgdk-3.so.0') |
| libgdk.gdk_wayland_window_get_wl_surface.restype = ctypes.c_void_p |
| libgdk.gdk_wayland_window_get_wl_surface.argtypes = [ctypes.c_void_p] |
| libgdk.gdk_wayland_display_get_wl_display.restype = ctypes.c_void_p |
| libgdk.gdk_wayland_display_get_wl_display.argtypes = [ctypes.c_void_p] |
| |
| @contextlib.contextmanager |
| def _gst_buffer_map(buffer, flags): |
| ptr = hash(buffer) |
| if flags & Gst.MapFlags.WRITE and libgst.gst_mini_object_is_writable(ptr) == 0: |
| raise ValueError('Buffer not writable') |
| |
| mapping = GstMapInfo() |
| success = libgst.gst_buffer_map(ptr, mapping, flags) |
| if not success: |
| raise RuntimeError('gst_buffer_map failed') |
| try: |
| yield ctypes.cast(mapping.data, ctypes.POINTER(ctypes.c_byte * mapping.size)).contents |
| finally: |
| libgst.gst_buffer_unmap(ptr, mapping) |
| |
| def _get_gl_texture_id(buf): |
| if not buf: |
| return 0 |
| memory = buf.peek_memory(0) |
| assert GstGL.is_gl_memory(memory) |
| return libgstgl.gst_gl_memory_get_texture_id(hash(memory)) |
| |
| VERTEX_SHADER_SRC = ''' |
| uniform mat4 u_transformation; |
| attribute vec4 a_position; |
| attribute vec2 a_texcoord; |
| varying vec2 v_texcoord; |
| void main() |
| { |
| gl_Position = u_transformation * a_position; |
| v_texcoord = a_texcoord; |
| } |
| ''' |
| |
| POSITIONS = numpy.array([ |
| 1.0, 1.0, |
| -1.0, 1.0, |
| -1.0, -1.0, |
| 1.0, -1.0, |
| ], dtype=numpy.float32) |
| |
| TEXCOORDS = numpy.array([ |
| 1.0, 0.0, |
| 0.0, 0.0, |
| 0.0, 1.0, |
| 1.0, 1.0, |
| ], dtype=numpy.float32) |
| |
| INDICES = numpy.array([ |
| 0, 1, 2, 0, 2, 3 |
| ], dtype=numpy.uint16) |
| |
| IDENTITY_MATRIX = numpy.array([ |
| [1.0, 0.0, 0.0, 0.0], |
| [0.0, 1.0, 0.0, 0.0], |
| [0.0, 0.0, 1.0, 0.0], |
| [0.0, 0.0, 0.0, 1.0], |
| ], dtype=numpy.float16) |
| |
| HFLIP_MATRIX = numpy.array([ |
| [-1.0, 0.0, 0.0, 0.0], |
| [ 0.0, 1.0, 0.0, 0.0], |
| [ 0.0, 0.0, 1.0, 0.0], |
| [ 0.0, 0.0, 0.0, 1.0], |
| ], dtype=numpy.float16) |
| |
| VFLIP_MATRIX = numpy.array([ |
| [1.0, 0.0, 0.0, 0.0], |
| [0.0, -1.0, 0.0, 0.0], |
| [0.0, 0.0, 1.0, 0.0], |
| [0.0, 0.0, 0.0, 1.0], |
| ], dtype=numpy.float16) |
| |
| NUM_BUFFERS = 2 |
| |
| class DmaOverlayBuffer(): |
| def __init__(self, pool, glupload): |
| self.glcontext = glupload.context |
| res, self.dmabuf = pool.acquire_buffer() |
| assert res == Gst.FlowReturn.OK |
| assert GstAllocators.is_dmabuf_memory(self.dmabuf.peek_memory(0)) |
| with _gst_buffer_map(self.dmabuf, Gst.MapFlags.WRITE) as mapped: |
| self.ptr = ctypes.addressof(mapped) |
| self.len = ctypes.sizeof(mapped) |
| self.clear() |
| meta = GstVideo.buffer_get_video_meta(self.dmabuf) |
| assert meta |
| self.surface = libcairo.cairo_image_surface_create_for_data( |
| self.ptr, |
| int(cairo.FORMAT_ARGB32), |
| meta.width, |
| meta.height, |
| meta.stride[0]) |
| self.cairo = libcairo.cairo_create(self.surface) |
| res, self.gl_buffer = glupload.perform_with_buffer(self.dmabuf) |
| assert res == GstGL.GLUploadReturn.DONE |
| memory = self.gl_buffer.peek_memory(0) |
| assert GstGL.is_gl_memory(memory) |
| self.texture_id = libgstgl.gst_gl_memory_get_texture_id(hash(memory)) |
| self.sync = GstGL.buffer_add_gl_sync_meta(self.glcontext, self.gl_buffer) |
| |
| def __del__(self): |
| if self.surface: |
| libcairo.cairo_surface_destroy(self.surface) |
| if self.cairo: |
| libcairo.cairo_destroy(self.cairo) |
| |
| def render_svg(self, svg): |
| self.wait_sync() |
| self.clear() |
| if svg: |
| data = svg.encode() |
| handle = librsvg.rsvg_handle_new_from_data(data, len(data), 0) |
| if handle: |
| librsvg.rsvg_handle_render_cairo(handle, self.cairo) |
| librsvg.rsvg_handle_close(handle, 0) |
| libgobject.g_object_unref(handle) |
| libcairo.cairo_surface_flush(self.surface) |
| |
| def clear(self): |
| ctypes.memset(self.ptr, 0, self.len) |
| |
| def set_sync_point(self): |
| self.sync.set_sync_point(self.glcontext) |
| |
| def wait_sync(self): |
| libgstgl.gst_gl_sync_meta_wait_cpu(hash(self.sync), hash(self.glcontext)) |
| |
| |
| class GlSvgOverlaySink(Gst.Bin, GstVideo.VideoOverlay): |
| __gstmetadata__ = ('GlSvgOverlaySink', |
| 'Sink/Video', |
| 'glimagesink with SVG overlays', |
| 'Coral <coral-support@google.com>') |
| __gsttemplates__ = (Gst.PadTemplate.new('sink', |
| Gst.PadDirection.SINK, |
| Gst.PadPresence.ALWAYS, |
| GstGL.GLUpload.get_input_template_caps() |
| )) |
| __gproperties__ = { |
| 'svg': (str, |
| 'SVG data', |
| 'SVG overlay data', |
| '', |
| GObject.ParamFlags.WRITABLE |
| ), |
| 'rotate-method': (str, |
| 'Rotate method', |
| 'Rotate method according to glimagesink', |
| 'none', |
| GObject.ParamFlags.WRITABLE |
| ), |
| } |
| __gsignals__ = { |
| 'drawn': (GObject.SignalFlags.RUN_LAST, None, ()) |
| } |
| |
| def __init__(self): |
| Gst.Bin.__init__(self) |
| self.shader = None |
| self.vao = 0 |
| self.positions_buffer = 0 |
| self.texcoords_buffer = 0 |
| self.vbo_indices = 0 |
| self.u_transformation = 0 |
| self.glcontext = None |
| self.glimagesink = Gst.ElementFactory.make('glimagesink') |
| self.add(self.glimagesink) |
| self.add_pad(Gst.GhostPad('sink', self.glimagesink.get_static_pad('sink'))) |
| self.glimagesink.connect('client-draw', self.on_draw) |
| self.glimagesink.connect('client-reshape', self.on_reshape) |
| self.glimagesink.get_static_pad('sink').add_probe( |
| Gst.PadProbeType.EVENT_UPSTREAM, self.on_glimagesink_event) |
| self.get_static_pad('sink').add_probe( |
| Gst.PadProbeType.QUERY_DOWNSTREAM, self.on_downstream_query) |
| self.render_thread = None |
| self.cond = threading.Condition() |
| self.rendering = False |
| self.svg = None |
| self.buffers = [None] * NUM_BUFFERS |
| self.index = 0 |
| self.matrix = IDENTITY_MATRIX |
| |
| self.print_fps = int(os.environ.get('PRINT_FPS', '0')) |
| self.incoming_frames = 0 |
| self.incoming_overlays = 0 |
| self.rendered_overlays = 0 |
| self.draws = 0 |
| self.fps_start = 0 |
| if self.print_fps: |
| self.glimagesink.get_static_pad('sink').add_probe( |
| Gst.PadProbeType.BUFFER, self.on_incoming_frame) |
| |
| def do_expose(self): |
| self.glimagesink.expose() |
| |
| def do_handle_events(self, handle_events): |
| self.glimagesink.handle_events(handle_events) |
| |
| def do_set_render_rectangle(self, x, y, width, height): |
| return self.glimagesink.set_render_rectangle(x, y, width, height) |
| |
| def do_set_window_handle(self, handle): |
| self.glimagesink.set_window_handle(handle) |
| |
| def on_glimagesink_event(self, pad, info): |
| event = info.get_event() |
| if event.type == Gst.EventType.RECONFIGURE: |
| return Gst.PadProbeReturn.DROP |
| return Gst.PadProbeReturn.OK |
| |
| def on_downstream_query(self, pad, info): |
| query = info.get_query() |
| if query.type == Gst.QueryType.ALLOCATION: |
| # Ask glimagesink, but remove the metas we don't support. |
| # Need to fiddle with refcount as Python bindings are buggy. |
| # refcount is really 1, but Python took another ref making |
| # it 2 and hence query is 'not writable'. |
| assert query.mini_object.refcount == 2 |
| try: |
| query.mini_object.refcount = 1 |
| if self.glimagesink.get_static_pad('sink').query(query): |
| for i in reversed(range(0, query.get_n_allocation_metas())): |
| gtype, params = query.parse_nth_allocation_meta(i) |
| if (gtype.name == 'GstVideoAffineTransformationAPI' or |
| gtype.name == 'GstVideoOverlayCompositionMetaAPI'): |
| query.remove_nth_allocation_meta(i) |
| return Gst.PadProbeReturn.HANDLED |
| finally: |
| query.mini_object.refcount = 2 |
| return Gst.PadProbeReturn.OK |
| |
| def on_glimagesink_event(self, pad, info): |
| event = info.get_event() |
| if event.type == Gst.EventType.RECONFIGURE: |
| return Gst.PadProbeReturn.DROP |
| return Gst.PadProbeReturn.OK |
| |
| def on_incoming_frame(self, pad, info): |
| self.incoming_frames += 1 |
| return Gst.PadProbeReturn.OK |
| |
| def post_error(self, string, debug=''): |
| Gst.error(string) |
| gerror = GLib.Error.new_literal(Gst.ResourceError.quark(), string, Gst.CoreError.FAILED) |
| message = Gst.Message.new_error(self, gerror, debug) |
| return self.post_message(message) |
| |
| def do_change_state(self, transition): |
| if transition == Gst.StateChange.READY_TO_NULL: |
| self.glcontext.thread_add(self.deinit_gl) |
| self.glcontext = None |
| elif transition == Gst.StateChange.PAUSED_TO_READY: |
| with self.cond: |
| self.rendering = False |
| self.cond.notify_all() |
| self.render_thread.join() |
| self.glcontext.thread_add(self.free_buffers) |
| |
| result = Gst.Bin.do_change_state(self, transition) |
| |
| if transition == Gst.StateChange.NULL_TO_READY: |
| self.glcontext = self.glimagesink.get_property('context') |
| if self.glcontext: |
| self.glcontext.thread_add(self.init_gl) |
| else: |
| self.post_error('failed to get gl context') |
| result = Gst.StateChangeReturn.FAILURE |
| elif transition == Gst.StateChange.READY_TO_PAUSED: |
| self.try_create_buffers() |
| self.rendering = True |
| self.render_thread = threading.Thread(target=self.render_loop) |
| self.render_thread.start() |
| elif transition == Gst.StateChange.PAUSED_TO_PLAYING: |
| self.try_create_buffers() |
| |
| return result |
| |
| def do_set_property(self, prop, value): |
| if prop.name == 'svg': |
| if not self.get_back_buffer(): |
| Gst.warning('Not ready to draw overlays, dropping data') |
| return |
| with self.cond: |
| self.incoming_overlays += 1 |
| self.svg = value or '' |
| self.cond.notify_all() |
| elif prop.name == 'rotate-method': |
| value = int(value) if value.isnumeric() else value |
| self.glimagesink.set_property(prop.name, value) |
| value = int(self.glimagesink.get_property(prop.name)) |
| if value == 0: |
| self.matrix = IDENTITY_MATRIX |
| elif value == 4: |
| self.matrix = HFLIP_MATRIX |
| elif value == 5: |
| self.matrix = VFLIP_MATRIX |
| else: |
| Gst.warning('Unsupported rotate-method') |
| self.matrix = IDENTITY_MATRIX |
| else: |
| self.glimagesink.set_property(prop.name, value) |
| |
| def do_get_property(self, prop): |
| return self.glimagesink.get_property(prop) |
| |
| def init_gl(self, glcontext): |
| assert not self.shader |
| assert glcontext == self.glcontext |
| |
| frag_stage = GstGL.GLSLStage.new_default_fragment(self.glcontext) |
| vert_stage = GstGL.GLSLStage.new_with_string(self.glcontext, |
| GL_VERTEX_SHADER, |
| GstGL.GLSLVersion.NONE, |
| GstGL.GLSLProfile.COMPATIBILITY | GstGL.GLSLProfile.ES, |
| VERTEX_SHADER_SRC) |
| self.shader = GstGL.GLShader.new(self.glcontext) |
| self.shader.compile_attach_stage(vert_stage) |
| self.shader.compile_attach_stage(frag_stage) |
| self.shader.link() |
| |
| self.u_transformation = glGetUniformLocation.baseFunction( |
| self.shader.get_program_handle(), 'u_transformation') |
| |
| a_position = self.shader.get_attribute_location('a_position') |
| a_texcoord = self.shader.get_attribute_location('a_texcoord') |
| |
| self.vao = glGenVertexArrays(1) |
| glBindVertexArray(self.vao) |
| |
| self.positions_buffer = glGenBuffers(1) |
| glBindBuffer(GL_ARRAY_BUFFER, self.positions_buffer) |
| glBufferData(GL_ARRAY_BUFFER, ArrayDatatype.arrayByteCount(POSITIONS), POSITIONS, GL_STATIC_DRAW) |
| |
| self.texcoords_buffer = glGenBuffers(1) |
| glBindBuffer(GL_ARRAY_BUFFER, self.texcoords_buffer) |
| glBufferData(GL_ARRAY_BUFFER, ArrayDatatype.arrayByteCount(TEXCOORDS), TEXCOORDS, GL_STATIC_DRAW) |
| |
| self.vbo_indices = glGenBuffers(1) |
| glBindBuffer(GL_ARRAY_BUFFER, self.vbo_indices) |
| glBufferData(GL_ARRAY_BUFFER, ArrayDatatype.arrayByteCount(INDICES), INDICES, GL_STATIC_DRAW) |
| |
| glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, self.vbo_indices); |
| glBindBuffer(GL_ARRAY_BUFFER, self.positions_buffer); |
| glVertexAttribPointer.baseFunction(a_position, 2, GL_FLOAT, GL_FALSE, 0, None) |
| glBindBuffer(GL_ARRAY_BUFFER, self.texcoords_buffer); |
| glVertexAttribPointer.baseFunction(a_texcoord, 2, GL_FLOAT, GL_FALSE, 0, None) |
| glEnableVertexAttribArray(a_position) |
| glEnableVertexAttribArray(a_texcoord) |
| |
| glBindVertexArray(0) |
| glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0) |
| glBindBuffer(GL_ARRAY_BUFFER, 0) |
| |
| def deinit_gl(self, glcontext): |
| assert glcontext == self.glcontext |
| self.overlay_shader = None |
| self.shader = None |
| glDeleteVertexArrays(1, [self.vao]) |
| self.vao = None |
| glDeleteBuffers(1, [self.positions_buffer]) |
| self.positions_buffer = None |
| glDeleteBuffers(1, [self.texcoords_buffer]) |
| self.texcoords_buffer = None |
| glDeleteBuffers(1, [self.vbo_indices]) |
| self.vbo_indices = None |
| |
| def on_reshape(self, sink, context, width, height): |
| sinkelement = self.glimagesink.get_by_interface(GstVideo.VideoOverlay) |
| if sinkelement.width and sinkelement.height: |
| src_ratio = sinkelement.width / sinkelement.height |
| dst_ratio = width / height |
| if src_ratio > dst_ratio: |
| w = width |
| h = width / src_ratio |
| x = 0 |
| y = (height - h) / 2 |
| elif src_ratio < dst_ratio: |
| w = height * src_ratio |
| h = height |
| x = (width - w) / 2 |
| y = 0 |
| else: |
| w = width |
| h = height; |
| x = 0 |
| y = 0 |
| else: |
| w = width |
| h = height |
| x = 0 |
| y = 0 |
| |
| glViewport(int(x), int(y), int(w), int(h)) |
| return True |
| |
| # TODO: affine gltransformation support |
| def on_draw(self, sink, context, sample): |
| assert context == self.glcontext |
| self.draws += 1 |
| |
| assert context == self.glcontext |
| frame_texture = _get_gl_texture_id(sample.get_buffer()) |
| overlay_buffer = self.get_front_buffer() |
| overlay_texture = overlay_buffer.texture_id if overlay_buffer else 0 |
| |
| glDisable(GL_BLEND) |
| |
| glBindVertexArray(self.vao) |
| glActiveTexture(GL_TEXTURE0) |
| glBindTexture(GL_TEXTURE_2D, frame_texture) |
| |
| self.shader.use() |
| self.shader.set_uniform_1i('frame', 0) |
| glUniformMatrix4fv(self.u_transformation, 1, GL_FALSE, self.matrix) |
| |
| glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, None) |
| |
| if overlay_texture: |
| glBindTexture(GL_TEXTURE_2D, overlay_texture) |
| glEnable(GL_BLEND) |
| glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) |
| glBlendEquation(GL_FUNC_ADD) |
| glUniformMatrix4fv(self.u_transformation, 1, GL_FALSE, IDENTITY_MATRIX) |
| glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, None) |
| |
| glActiveTexture(GL_TEXTURE0) |
| glBindTexture(GL_TEXTURE_2D, 0) |
| glDisable(GL_BLEND) |
| context.clear_shader() |
| glBindVertexArray(0) |
| |
| if overlay_buffer: |
| overlay_buffer.set_sync_point() |
| |
| self.emit('drawn') |
| |
| if not self.fps_start: |
| self.fps_start = time.monotonic() |
| elapsed = time.monotonic() - self.fps_start |
| if self.print_fps and elapsed > self.print_fps: |
| incoming_fps = self.incoming_frames / elapsed |
| draw_fps = self.draws / elapsed |
| incoming_overlay_fps = self.incoming_overlays / elapsed |
| render_fps = self.rendered_overlays / elapsed |
| print('glsvgoverlaysink: in frames {} ({:.2f} fps) svg {} ({:.2f} fps), rendered {} ({:.2f} fps), draw {} ({:.2f} fps)'.format( |
| self.incoming_frames, self.incoming_frames / elapsed, |
| self.incoming_overlays, self.incoming_overlays / elapsed, |
| self.rendered_overlays, self.rendered_overlays / elapsed, |
| self.draws, self.draws / elapsed)) |
| self.incoming_frames = 0 |
| self.incoming_overlays = 0 |
| self.rendered_overlays = 0 |
| self.draws = 0 |
| self.fps_start = time.monotonic() |
| |
| return True |
| |
| def render_loop(self): |
| while True: |
| with self.cond: |
| rendering = self.rendering |
| svg = self.svg |
| self.svg = None |
| |
| if not rendering: |
| break |
| |
| if svg is None: |
| with self.cond: |
| self.cond.wait() |
| continue |
| |
| buf = self.get_back_buffer() |
| buf.render_svg(svg) |
| self.rendered_overlays += 1 |
| self.swap_buffers() |
| |
| def try_create_buffers(self): |
| if self.buffers[0]: |
| return |
| |
| sink = self.glimagesink.get_by_interface(GstVideo.VideoOverlay) |
| width = sink.width |
| height = sink.height |
| if not width or not height: |
| return |
| |
| render_caps = 'video/x-raw, width={}, height={}, format=BGRA' |
| gl_caps = 'video/x-raw(memory:GLMemory), width={}, height={}, format=RGBA, texture-target=2D' |
| min_stride = libcairo.cairo_format_stride_for_width(int(cairo.FORMAT_ARGB32), width) |
| render_caps = Gst.Caps.from_string(render_caps.format(width, height)) |
| gl_caps = Gst.Caps.from_string(gl_caps.format(width, height)) |
| glupload = GstGL.GLUpload.new(self.glcontext) |
| glupload.set_caps(render_caps, gl_caps) |
| query = Gst.Query.new_allocation(render_caps, True) |
| glupload.propose_allocation(None, query) |
| assert query.get_n_allocation_pools() |
| pool, size, min_bufs, max_bufs = query.parse_nth_allocation_pool(0) |
| assert pool.set_active(True) |
| |
| for i in range(0, NUM_BUFFERS): |
| self.buffers[i] = DmaOverlayBuffer(pool, glupload) |
| assert pool.set_active(False) |
| |
| def free_buffers(self, glcontext): |
| self.buffers = [None] * NUM_BUFFERS |
| |
| def get_front_buffer(self): |
| return self.buffers[(self.index - 1) % len(self.buffers)] |
| |
| def get_back_buffer(self): |
| return self.buffers[self.index] |
| |
| def swap_buffers(self): |
| self.index = (self.index + 1) % len(self.buffers) |
| |
| def get_default_wayland_display_context(self): |
| wl_display = libgdk.gdk_wayland_display_get_wl_display(hash(Gdk.Display.get_default())) |
| context = Gst.Context.new('GstWaylandDisplayHandleContextType', True) |
| structure = libgst.gst_context_writable_structure(hash(context)) |
| libgst.gst_structure_set(structure, ctypes.c_char_p('display'.encode()), |
| hash(GObject.TYPE_POINTER), wl_display, 0) |
| return context |
| |
| def get_gl_display_context(self): |
| if not self.glcontext: |
| return None |
| context = Gst.Context.new(GstGL.GL_DISPLAY_CONTEXT_TYPE, True) |
| GstGL.context_set_gl_display(context, self.glcontext.get_display()) |
| return context |
| |
| def get_wayland_window_handle(self, widget): |
| return libgdk.gdk_wayland_window_get_wl_surface(hash(widget.get_window())) |
| |
| def get_sharable_local_context(self): |
| if not self.glcontext: |
| return None |
| _, new_glcontext = self.glcontext.get_display().create_context(self.glcontext) |
| gst_context = Gst.Context.new('gst.gl.local_context', True) |
| structure = libgst.gst_context_writable_structure(hash(gst_context)) |
| libgst.gst_structure_set(structure, ctypes.c_char_p('context'.encode()), |
| hash(GObject.GType.from_name('GstGLContext')), hash(new_glcontext), 0) |
| return gst_context |
| |
| |
| __gstelementfactory__ = ("glsvgoverlaysink", Gst.Rank.NONE, GlSvgOverlaySink) |
