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comparison: content/media/gstreamer/GStreamerLoader.cpp
content/media/gstreamer/GStreamerLoader.cpp
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| 1 /* vim:set ts=2 sw=2 sts=2 et cindent: */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this file, | |
| 4 * You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include <dlfcn.h> | |
| 7 #include <stdio.h> | |
| 8 | |
| 9 #include "nsDebug.h" | |
| 10 #include "mozilla/NullPtr.h" | |
| 11 | |
| 12 #include "GStreamerLoader.h" | |
| 13 | |
| 14 #define LIBGSTREAMER 0 | |
| 15 #define LIBGSTAPP 1 | |
| 16 #define LIBGSTVIDEO 2 | |
| 17 | |
| 18 #ifdef __OpenBSD__ | |
| 19 #define LIB_GST_SUFFIX ".so" | |
| 20 #else | |
| 21 #define LIB_GST_SUFFIX ".so.0" | |
| 22 #endif | |
| 23 | |
| 24 namespace mozilla { | |
| 25 | |
| 26 /* | |
| 27 * Declare our function pointers using the types from the global gstreamer | |
| 28 * definitions. | |
| 29 */ | |
| 30 #define GST_FUNC(_, func) typeof(::func)* func; | |
| 31 #define REPLACE_FUNC(func) GST_FUNC(-1, func) | |
| 32 #include "GStreamerFunctionList.h" | |
| 33 #undef GST_FUNC | |
| 34 #undef REPLACE_FUNC | |
| 35 | |
| 36 /* | |
| 37 * Redefinitions of functions that have been defined in the gstreamer headers to | |
| 38 * stop them calling the gstreamer functions in global scope. | |
| 39 */ | |
| 40 GstBuffer * gst_buffer_ref_impl(GstBuffer *buf); | |
| 41 void gst_buffer_unref_impl(GstBuffer *buf); | |
| 42 void gst_message_unref_impl(GstMessage *msg); | |
| 43 void gst_caps_unref_impl(GstCaps *caps); | |
| 44 | |
| 45 #if GST_VERSION_MAJOR == 1 | |
| 46 void gst_sample_unref_impl(GstSample *sample); | |
| 47 #endif | |
| 48 | |
| 49 bool | |
| 50 load_gstreamer() | |
| 51 { | |
| 52 #ifdef __APPLE__ | |
| 53 return true; | |
| 54 #endif | |
| 55 static bool loaded = false; | |
| 56 | |
| 57 if (loaded) { | |
| 58 return true; | |
| 59 } | |
| 60 | |
| 61 void *gstreamerLib = nullptr; | |
| 62 guint major = 0; | |
| 63 guint minor = 0; | |
| 64 guint micro, nano; | |
| 65 | |
| 66 typedef typeof(::gst_version) VersionFuncType; | |
| 67 if (VersionFuncType *versionFunc = (VersionFuncType*)dlsym(RTLD_DEFAULT, "gst_version")) { | |
| 68 versionFunc(&major, &minor, µ, &nano); | |
| 69 } | |
| 70 | |
| 71 if (major == GST_VERSION_MAJOR && minor == GST_VERSION_MINOR) { | |
| 72 gstreamerLib = RTLD_DEFAULT; | |
| 73 } else { | |
| 74 gstreamerLib = dlopen("libgstreamer-" GST_API_VERSION LIB_GST_SUFFIX, RTLD_NOW | RTLD_LOCAL); | |
| 75 } | |
| 76 | |
| 77 void *handles[3] = { | |
| 78 gstreamerLib, | |
| 79 dlopen("libgstapp-" GST_API_VERSION LIB_GST_SUFFIX, RTLD_NOW | RTLD_LOCAL), | |
| 80 dlopen("libgstvideo-" GST_API_VERSION LIB_GST_SUFFIX, RTLD_NOW | RTLD_LOCAL) | |
| 81 }; | |
| 82 | |
| 83 for (size_t i = 0; i < sizeof(handles) / sizeof(handles[0]); i++) { | |
| 84 if (!handles[i]) { | |
| 85 NS_WARNING("Couldn't link gstreamer libraries"); | |
| 86 goto fail; | |
| 87 } | |
| 88 } | |
| 89 | |
| 90 #define GST_FUNC(lib, symbol) \ | |
| 91 if (!(symbol = (typeof(symbol))dlsym(handles[lib], #symbol))) { \ | |
| 92 NS_WARNING("Couldn't link symbol " #symbol); \ | |
| 93 goto fail; \ | |
| 94 } | |
| 95 #define REPLACE_FUNC(symbol) symbol = symbol##_impl; | |
| 96 #include "GStreamerFunctionList.h" | |
| 97 #undef GST_FUNC | |
| 98 #undef REPLACE_FUNC | |
| 99 | |
| 100 loaded = true; | |
| 101 return true; | |
| 102 | |
| 103 fail: | |
| 104 | |
| 105 for (size_t i = 0; i < sizeof(handles) / sizeof(handles[0]); i++) { | |
| 106 if (handles[i] && handles[i] != RTLD_DEFAULT) { | |
| 107 dlclose(handles[i]); | |
| 108 } | |
| 109 } | |
| 110 | |
| 111 return false; | |
| 112 } | |
| 113 | |
| 114 GstBuffer * | |
| 115 gst_buffer_ref_impl(GstBuffer *buf) | |
| 116 { | |
| 117 return (GstBuffer *)gst_mini_object_ref(GST_MINI_OBJECT_CAST(buf)); | |
| 118 } | |
| 119 | |
| 120 void | |
| 121 gst_buffer_unref_impl(GstBuffer *buf) | |
| 122 { | |
| 123 gst_mini_object_unref(GST_MINI_OBJECT_CAST(buf)); | |
| 124 } | |
| 125 | |
| 126 void | |
| 127 gst_message_unref_impl(GstMessage *msg) | |
| 128 { | |
| 129 gst_mini_object_unref(GST_MINI_OBJECT_CAST(msg)); | |
| 130 } | |
| 131 | |
| 132 #if GST_VERSION_MAJOR == 1 | |
| 133 void | |
| 134 gst_sample_unref_impl(GstSample *sample) | |
| 135 { | |
| 136 gst_mini_object_unref(GST_MINI_OBJECT_CAST(sample)); | |
| 137 } | |
| 138 #endif | |
| 139 | |
| 140 void | |
| 141 gst_caps_unref_impl(GstCaps *caps) | |
| 142 { | |
| 143 gst_mini_object_unref(GST_MINI_OBJECT_CAST(caps)); | |
| 144 } | |
| 145 | |
| 146 } |
