зеркало из https://github.com/mozilla/gecko-dev.git
146 строки
3.2 KiB
C++
146 строки
3.2 KiB
C++
/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <dlfcn.h>
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#include <stdio.h>
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#include "nsDebug.h"
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#include "GStreamerLoader.h"
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#define LIBGSTREAMER 0
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#define LIBGSTAPP 1
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#define LIBGSTVIDEO 2
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#ifdef __OpenBSD__
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#define LIB_GST_SUFFIX ".so"
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#else
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#define LIB_GST_SUFFIX ".so.0"
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#endif
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namespace mozilla {
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/*
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* Declare our function pointers using the types from the global gstreamer
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* definitions.
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*/
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#define GST_FUNC(_, func) typeof(::func)* func;
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#define REPLACE_FUNC(func) GST_FUNC(-1, func)
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#include "GStreamerFunctionList.h"
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#undef GST_FUNC
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#undef REPLACE_FUNC
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/*
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* Redefinitions of functions that have been defined in the gstreamer headers to
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* stop them calling the gstreamer functions in global scope.
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*/
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GstBuffer * gst_buffer_ref_impl(GstBuffer *buf);
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void gst_buffer_unref_impl(GstBuffer *buf);
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void gst_message_unref_impl(GstMessage *msg);
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void gst_caps_unref_impl(GstCaps *caps);
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#if GST_VERSION_MAJOR == 1
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void gst_sample_unref_impl(GstSample *sample);
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#endif
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bool
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load_gstreamer()
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{
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#ifdef __APPLE__
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return true;
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#endif
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static bool loaded = false;
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if (loaded) {
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return true;
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}
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void *gstreamerLib = nullptr;
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guint major = 0;
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guint minor = 0;
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guint micro, nano;
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typedef typeof(::gst_version) VersionFuncType;
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if (VersionFuncType *versionFunc = (VersionFuncType*)dlsym(RTLD_DEFAULT, "gst_version")) {
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versionFunc(&major, &minor, µ, &nano);
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}
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if (major == GST_VERSION_MAJOR && minor == GST_VERSION_MINOR) {
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gstreamerLib = RTLD_DEFAULT;
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} else {
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gstreamerLib = dlopen("libgstreamer-" GST_API_VERSION LIB_GST_SUFFIX, RTLD_NOW | RTLD_LOCAL);
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}
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void *handles[3] = {
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gstreamerLib,
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dlopen("libgstapp-" GST_API_VERSION LIB_GST_SUFFIX, RTLD_NOW | RTLD_LOCAL),
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dlopen("libgstvideo-" GST_API_VERSION LIB_GST_SUFFIX, RTLD_NOW | RTLD_LOCAL)
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};
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for (size_t i = 0; i < sizeof(handles) / sizeof(handles[0]); i++) {
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if (!handles[i]) {
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NS_WARNING("Couldn't link gstreamer libraries");
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goto fail;
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}
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}
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#define GST_FUNC(lib, symbol) \
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if (!(symbol = (typeof(symbol))dlsym(handles[lib], #symbol))) { \
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NS_WARNING("Couldn't link symbol " #symbol); \
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goto fail; \
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}
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#define REPLACE_FUNC(symbol) symbol = symbol##_impl;
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#include "GStreamerFunctionList.h"
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#undef GST_FUNC
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#undef REPLACE_FUNC
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loaded = true;
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return true;
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fail:
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for (size_t i = 0; i < sizeof(handles) / sizeof(handles[0]); i++) {
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if (handles[i] && handles[i] != RTLD_DEFAULT) {
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dlclose(handles[i]);
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}
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}
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return false;
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}
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GstBuffer *
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gst_buffer_ref_impl(GstBuffer *buf)
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{
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return (GstBuffer *)gst_mini_object_ref(GST_MINI_OBJECT_CAST(buf));
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}
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void
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gst_buffer_unref_impl(GstBuffer *buf)
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{
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gst_mini_object_unref(GST_MINI_OBJECT_CAST(buf));
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}
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void
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gst_message_unref_impl(GstMessage *msg)
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{
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gst_mini_object_unref(GST_MINI_OBJECT_CAST(msg));
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}
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#if GST_VERSION_MAJOR == 1
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void
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gst_sample_unref_impl(GstSample *sample)
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{
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gst_mini_object_unref(GST_MINI_OBJECT_CAST(sample));
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}
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#endif
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void
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gst_caps_unref_impl(GstCaps *caps)
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{
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gst_mini_object_unref(GST_MINI_OBJECT_CAST(caps));
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}
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}
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