Какой код выполняется при отсоединении наушников?

Решение для декодирования видео в linux / chromium:

Функция gpuVideoDecodeAccelerator была отключена в коде хромового linux в течение нескольких месяцев (за исключением ChromiumOS, очевидно), поэтому вам придется исправлять хром следующим образом: [ ! d1]

https://bazaar.launchpad.net/~saiarcot895/chromium-browser/chromium-browser.utopic.beta/view/head:/debian/patches/enable_vaapi_on_linux.diff

или используйте этот отличный PPA:

https://bazaar.launchpad.net/~saiarcot895/chromium-browser/chromium-browser.utopic.beta/view/head:/debian/patches/ enable_vaapi_on_linux.diff

Протестировано с libva на Intel SandyBridge для H264, отлично работает. Не знаю о VP8.

В соответствии с запросом здесь находится полный патч:

Index: beta.vivid/content/common/gpu/media/gpu_video_decode_accelerator.cc
===================================================================
--- beta.vivid.orig/content/common/gpu/media/gpu_video_decode_accelerator.cc    2014-12-04 09:32:45.344607112 -0500
+++ beta.vivid/content/common/gpu/media/gpu_video_decode_accelerator.cc 2014-12-04 09:32:45.341607169 -0500
@@ -31,7 +31,7 @@
 #elif defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL) && defined(USE_X11)
 #include "content/common/gpu/media/v4l2_video_decode_accelerator.h"
 #include "content/common/gpu/media/v4l2_video_device.h"
-#elif defined(OS_CHROMEOS) && defined(ARCH_CPU_X86_FAMILY) && defined(USE_X11)
+#elif (defined(OS_CHROMEOS) || defined(OS_LINUX)) && defined(ARCH_CPU_X86_FAMILY) && defined(USE_X11)
 #include "content/common/gpu/media/vaapi_video_decode_accelerator.h"
 #include "ui/gl/gl_context_glx.h"
 #include "ui/gl/gl_implementation.h"
@@ -272,7 +272,7 @@
       make_context_current_,
       device.Pass(),
       io_message_loop_));
-#elif defined(OS_CHROMEOS) && defined(ARCH_CPU_X86_FAMILY) && defined(USE_X11)
+#elif (defined(OS_CHROMEOS) || defined(OS_LINUX)) && defined(ARCH_CPU_X86_FAMILY) && defined(USE_X11)
   if (gfx::GetGLImplementation() != gfx::kGLImplementationDesktopGL) {
     VLOG(1) << "HW video decode acceleration not available without "
                "DesktopGL (GLX).";
Index: beta.vivid/content/content_common.gypi
===================================================================
--- beta.vivid.orig/content/content_common.gypi 2014-12-04 09:32:45.344607112 -0500
+++ beta.vivid/content/content_common.gypi  2014-12-04 09:32:45.341607169 -0500
@@ -769,7 +769,7 @@
         '<(DEPTH)/third_party/khronos',
       ],
     }],
-    ['target_arch != "arm" and chromeos == 1 and use_x11 == 1', {
+    ['target_arch != "arm" and (chromeos == 1 or desktop_linux == 1) and use_x11 == 1', {
       'dependencies': [
         '../media/media.gyp:media',
         '../third_party/libyuv/libyuv.gyp:libyuv',
Index: beta.vivid/content/content_gpu.gypi
===================================================================
--- beta.vivid.orig/content/content_gpu.gypi    2014-12-04 09:32:45.344607112 -0500
+++ beta.vivid/content/content_gpu.gypi 2014-12-04 09:32:45.341607169 -0500
@@ -40,7 +40,7 @@
         ],
       },
     }],
-    ['target_arch!="arm" and chromeos == 1', {
+    ['target_arch!="arm" and (chromeos == 1 or desktop_linux == 1)', {
       'include_dirs': [
         '<(DEPTH)/third_party/libva',
       ],
Index: beta.vivid/content/content_tests.gypi
===================================================================
--- beta.vivid.orig/content/content_tests.gypi  2014-12-04 09:32:45.344607112 -0500
+++ beta.vivid/content/content_tests.gypi   2014-12-04 09:32:45.342607150 -0500
@@ -1556,7 +1556,7 @@
           },
         ]
     }],
-    ['chromeos==1 and use_x11 == 1 and target_arch != "arm"', {
+    ['(chromeos==1 or desktop_linux==1) and use_x11 == 1 and target_arch != "arm"', {
       'targets': [
           {
             'target_name': 'vaapi_h264_decoder_unittest',
Index: beta.vivid/content/public/common/content_switches.cc
===================================================================
--- beta.vivid.orig/content/public/common/content_switches.cc   2014-12-04 09:32:45.344607112 -0500
+++ beta.vivid/content/public/common/content_switches.cc    2014-12-04 09:32:45.342607150 -0500
@@ -930,7 +930,7 @@
 // Disable web audio API.
 const char kDisableWebAudio[]               = "disable-webaudio";

-#if defined(OS_CHROMEOS)
+#if defined(OS_CHROMEOS) || defined(OS_LINUX)
 // Disables panel fitting (used for mirror mode).
 const char kDisablePanelFitting[]           = "disable-panel-fitting";

Index: beta.vivid/content/public/common/content_switches.h
===================================================================
--- beta.vivid.orig/content/public/common/content_switches.h    2014-12-04 09:32:45.344607112 -0500
+++ beta.vivid/content/public/common/content_switches.h 2014-12-04 09:32:45.342607150 -0500
@@ -268,7 +268,7 @@

 CONTENT_EXPORT extern const char kDisableWebAudio[];

-#if defined(OS_CHROMEOS)
+#if defined(OS_CHROMEOS) || defined(OS_LINUX)
 CONTENT_EXPORT extern const char kDisablePanelFitting[];
 CONTENT_EXPORT extern const char kDisableVaapiAcceleratedVideoEncode[];
 #endif
Index: beta.vivid/media/media.gyp
===================================================================
--- beta.vivid.orig/media/media.gyp 2014-12-04 09:32:45.344607112 -0500
+++ beta.vivid/media/media.gyp  2014-12-04 09:32:45.342607150 -0500
@@ -672,7 +672,7 @@
           ],
         }],
         # For VaapiVideoEncodeAccelerator.
-        ['target_arch != "arm" and chromeos == 1 and use_x11 == 1', {
+        ['target_arch != "arm" and (chromeos == 1 or desktop_linux == 1) and use_x11 == 1', {
           'sources': [
             'filters/h264_bitstream_buffer.cc',
             'filters/h264_bitstream_buffer.h',
Index: beta.vivid/gpu/config/software_rendering_list_json.cc
===================================================================
--- beta.vivid.orig/gpu/config/software_rendering_list_json.cc  2014-12-04 09:32:45.344607112 -0500
+++ beta.vivid/gpu/config/software_rendering_list_json.cc   2014-12-04 09:32:45.343607131 -0500
@@ -508,8 +508,8 @@
     },
     {
       "id": 48,
-      "description": "Accelerated video decode is unavailable on Mac and Linux",
-      "cr_bugs": [137247, 133828],
+      "description": "Accelerated video decode is unavailable on Mac",
+      "cr_bugs": [133828],
       "exceptions": [
         {
           "os": {
@@ -525,6 +525,11 @@
           "os": {
             "type": "android"
           }
+        },
+        {
+          "os": {
+            "type": "linux"
+          }
         }
       ],
       "features": [
Index: beta.vivid/content/common/sandbox_linux/bpf_gpu_policy_linux.cc
===================================================================
--- beta.vivid.orig/content/common/sandbox_linux/bpf_gpu_policy_linux.cc    2014-12-04 09:32:45.344607112 -0500
+++ beta.vivid/content/common/sandbox_linux/bpf_gpu_policy_linux.cc 2014-12-04 09:32:45.343607131 -0500
@@ -21,6 +21,8 @@
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "build/build_config.h"
+// Auto-generated for dlopen libva libraries
+#include "content/common/gpu/media/va_stubs.h"
 #include "content/common/sandbox_linux/sandbox_bpf_base_policy_linux.h"
 #include "content/common/sandbox_linux/sandbox_seccomp_bpf_linux.h"
 #include "content/common/set_process_title.h"
@@ -30,6 +32,8 @@
 #include "sandbox/linux/seccomp-bpf-helpers/syscall_sets.h"
 #include "sandbox/linux/services/linux_syscalls.h"
 #include "sandbox/linux/syscall_broker/broker_process.h"
+#include "third_party/libva/va/va.h"
+#include "third_party/libva/va/va_x11.h"

 using sandbox::BrokerProcess;
 using sandbox::SyscallSets;
@@ -38,6 +42,14 @@
 using sandbox::bpf_dsl::ResultExpr;
 using sandbox::bpf_dsl::Trap;

+using content_common_gpu_media::kModuleVa;
+using content_common_gpu_media::InitializeStubs;
+using content_common_gpu_media::StubPathMap;
+
+// libva-x11 depends on libva, so dlopen libva-x11 is enough
+static const base::FilePath::CharType kVaLib[] =
+    FILE_PATH_LITERAL("libva-x11.so.1");
+
 namespace content {

 namespace {
@@ -238,19 +250,38 @@
     // Accelerated video dlopen()'s some shared objects
     // inside the sandbox, so preload them now.
     if (IsAcceleratedVideoEnabled()) {
-      const char* I965DrvVideoPath = NULL;
+      StubPathMap paths;
+      paths[kModuleVa].push_back(kVaLib);
+      if (!InitializeStubs(paths)) {
+        return false;
+      }

-      if (IsArchitectureX86_64()) {
-        I965DrvVideoPath = "/usr/lib64/va/drivers/i965_drv_video.so";
-      } else if (IsArchitectureI386()) {
-        I965DrvVideoPath = "/usr/lib/va/drivers/i965_drv_video.so";
+      // libva drivers won't get loaded even above two libraries get dlopened.
+      // Thus, libva calls will fail after post sandbox stage.
+      //
+      // To get the va driver loadded before sandboxing, upstream simply dlopen
+      // the hard-coded va driver path because ChromeOS is the only platform
+      // that Google want to support libva.
+      //
+      // While generic linux distros ship va driver as anywhere they want.
+      // Fortunately, the va driver will be loadded when vaInitialize() get
+      // called.
+      // So the following code is to call vaInitialize() before sandboxing.
+      Display* x_display = XOpenDisplay(NULL);
+      VADisplay va_display = vaGetDisplay(x_display);
+      if (!vaDisplayIsValid(va_display)) {
+        DVLOG(1) << "Failed to call vaGetDisplay()";
+        return false;
       }

-      dlopen(I965DrvVideoPath, RTLD_NOW|RTLD_GLOBAL|RTLD_NODELETE);
-      dlopen("libva.so.1", RTLD_NOW|RTLD_GLOBAL|RTLD_NODELETE);
-      dlopen("libva-x11.so.1", RTLD_NOW|RTLD_GLOBAL|RTLD_NODELETE);
-    }
-  }
+      int major_version, minor_version;
+      if (vaInitialize(va_display, &major_version, &minor_version)
+          != VA_STATUS_SUCCESS) {
+        DVLOG(1) << "Failed to call vaInitialize()";
+        return false;
+      }
+    }  // end of IsAcceleratedVideoDecodeEnabled()
+  }  // end of IsArchitectureX86_64() || IsArchitectureI386()

   return true;
 }