Implement Pepper PPB_VideoDecoder interface.

ppapi/proxy/video_decoder_resource_unittest.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/memory/shared_memory.h"
+#include "base/message_loop/message_loop.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/ppb_video_decoder.h"
+#include "ppapi/proxy/locking_resource_releaser.h"
+#include "ppapi/proxy/plugin_message_filter.h"
+#include "ppapi/proxy/ppapi_message_utils.h"
+#include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/proxy/ppapi_proxy_test.h"
+#include "ppapi/proxy/ppb_graphics_3d_proxy.h"
+#include "ppapi/proxy/video_decoder_resource.h"
+#include "ppapi/shared_impl/proxy_lock.h"
+#include "ppapi/thunk/enter.h"
+#include "ppapi/thunk/ppb_graphics_3d_api.h"
+#include "ppapi/thunk/ppb_video_decoder_api.h"
+#include "ppapi/thunk/thunk.h"
+
+using ppapi::proxy::ResourceMessageTestSink;
+using ppapi::thunk::EnterResource;
+using ppapi::thunk::PPB_VideoDecoder_API;
+
+namespace ppapi {
+namespace proxy {
+
+namespace {
+
+const PP_Bool kAllowSoftwareFallback = PP_TRUE;
+const uint32_t kDecodeBufferSize = 16;
+const uint32_t kDecodeId = 5;
+const uint32_t kTextureId1 = 11;
+const uint32_t kTextureId2 = 12;
+
+class MockCompletionCallback {
+ public:
+  MockCompletionCallback() : called_(false) {}
+
+  bool called() { return called_; }
+  int32_t result() { return result_; }
+
+  void Reset() { called_ = false; }
+
+  static void Callback(void* user_data, int32_t result) {
+    MockCompletionCallback* that =
+        reinterpret_cast<MockCompletionCallback*>(user_data);
+    that->called_ = true;
+    that->result_ = result;
+  }
+
+ private:
+  bool called_;
+  int32_t result_;
+};
+
+class VideoDecoderResourceTest : public PluginProxyTest {
+ public:
+  const PPB_VideoDecoder_0_1* decoder_iface;
+  const PPB_Graphics3D_1_0* graphics3d_iface;
+
+  VideoDecoderResourceTest()
+      : decoder_iface(thunk::GetPPB_VideoDecoder_0_1_Thunk()),
+        graphics3d_iface(thunk::GetPPB_Graphics3D_1_0_Thunk()) {}
+
+  void SendReply(const ResourceMessageCallParams& params,
+                 int32_t result,
+                 const IPC::Message& nested_message) {
+    ResourceMessageReplyParams reply_params(params.pp_resource(),
+                                            params.sequence());
+    reply_params.set_result(result);
+    PluginMessageFilter::DispatchResourceReplyForTest(reply_params,
+                                                      nested_message);
+  }
+
+  void SendReplyWithHandle(const ResourceMessageCallParams& params,
+                           int32_t result,
+                           const IPC::Message& nested_message,
+                           const SerializedHandle& handle) {
+    ResourceMessageReplyParams reply_params(params.pp_resource(),
+                                            params.sequence());
+    reply_params.set_result(result);
+    reply_params.AppendHandle(handle);
+    PluginMessageFilter::DispatchResourceReplyForTest(reply_params,
+                                                      nested_message);
+  }
+
+  PP_Resource CreateDecoder() { return decoder_iface->Create(pp_instance()); }
+
+  PP_Resource CreateGraphics3d() {
+    ProxyAutoLock lock;
+
+    HostResource host_resource;
+    host_resource.SetHostResource(pp_instance(), 5);
+    scoped_refptr<ppapi::proxy::Graphics3D> graphics_3d(
+        new ppapi::proxy::Graphics3D(host_resource));
+    return graphics_3d->GetReference();
+  }
+
+  PP_Resource CreateAndInitializeDecoder() {
+    PP_Resource decoder = CreateDecoder();
+    LockingResourceReleaser graphics3d(CreateGraphics3d());
+    MockCompletionCallback cb;
+    int32_t result =
+        decoder_iface->Initialize(decoder,
+                                  graphics3d.get(),
+                                  PP_VIDEOPROFILE_H264MAIN,
+                                  PP_TRUE /* allow_software_fallback */,
+                                  PP_MakeOptionalCompletionCallback(
+                                      &MockCompletionCallback::Callback, &cb));
+    if (result != PP_OK_COMPLETIONPENDING)
+      return 0;
+    ResourceMessageCallParams params;
+    IPC::Message msg;
+    if (!sink().GetFirstResourceCallMatching(
+            PpapiHostMsg_VideoDecoder_Initialize::ID, &params, &msg))
+      return 0;
+    sink().ClearMessages();
+    SendReply(params, PP_OK, PpapiPluginMsg_VideoDecoder_InitializeReply());
+    return decoder;
+  }
+
+  SerializedHandle CreateSharedMemory(uint32_t size) {
+    base::SharedMemory shm;
+    shm.CreateAnonymous(size);
+    base::SharedMemoryHandle shm_handle;
+    shm.ShareToProcess(base::GetCurrentProcessHandle(), &shm_handle);
+    return SerializedHandle(shm_handle, size);
+  }
+
+  char decode_buffer[kDecodeBufferSize] = {0x55};
+
+  int32_t CallDecode(PP_Resource pp_decoder, MockCompletionCallback* cb) {
+    int32_t result =
+        decoder_iface->Decode(pp_decoder,
+                              kDecodeId,
+                              kDecodeBufferSize,
+                              decode_buffer,
+                              PP_MakeOptionalCompletionCallback(
+                                  &MockCompletionCallback::Callback, cb));
+    return result;
+  }
+
+  int32_t CallGetPicture(PP_Resource pp_decoder,
+                         PP_VideoPicture* picture,
+                         MockCompletionCallback* cb) {
+    int32_t result =
+        decoder_iface->GetPicture(pp_decoder,
+                                  picture,
+                                  PP_MakeOptionalCompletionCallback(
+                                      &MockCompletionCallback::Callback, cb));
+    return result;
+  }
+
+  void CallRecyclePicture(PP_Resource pp_decoder,
+                          const PP_VideoPicture& picture) {
+    decoder_iface->RecyclePicture(pp_decoder, &picture);
+  }
+
+  int32_t CallFlush(PP_Resource pp_decoder, MockCompletionCallback* cb) {
+    int32_t result =
+        decoder_iface->Flush(pp_decoder,
+                             PP_MakeOptionalCompletionCallback(
+                                 &MockCompletionCallback::Callback, cb));
+    return result;
+  }
+
+  int32_t CallReset(PP_Resource pp_decoder, MockCompletionCallback* cb) {
+    int32_t result =
+        decoder_iface->Reset(pp_decoder,
+                             PP_MakeOptionalCompletionCallback(
+                                 &MockCompletionCallback::Callback, cb));
+    return result;
+  }
+
+  void SendGetShmReply(const ResourceMessageCallParams& params, uint32_t size) {
+    SendReplyWithHandle(params,
+                        PP_OK,
+                        PpapiPluginMsg_VideoDecoder_GetShmReply(size),
+                        CreateSharedMemory(size));
+  }
+
+  void SendDecodeReply(const ResourceMessageCallParams& params,
+                       uint32_t shm_id) {
+    SendReply(params, PP_OK, PpapiPluginMsg_VideoDecoder_DecodeReply(shm_id));
+  }
+
+  void SendPictureReady(const ResourceMessageCallParams& params,
+                        uint32_t shm_id,
+                        uint32_t texture_id) {
+    SendReply(params,
+              PP_OK,
+              PpapiPluginMsg_VideoDecoder_PictureReady(shm_id, texture_id));
+  }
+
+  void SendFlushReply(const ResourceMessageCallParams& params) {
+    SendReply(params, PP_OK, PpapiPluginMsg_VideoDecoder_FlushReply());
+  }
+
+  void SendResetReply(const ResourceMessageCallParams& params) {
+    SendReply(params, PP_OK, PpapiPluginMsg_VideoDecoder_ResetReply());
+  }
+
+  void SendNotifyError(const ResourceMessageCallParams& params, int32_t error) {
+    SendReply(params, PP_OK, PpapiPluginMsg_VideoDecoder_NotifyError(error));
+  }
+
+  bool CheckGetShmMsg(ResourceMessageCallParams* params, uint32_t* size) {
+    IPC::Message msg;
+    if (!sink().GetFirstResourceCallMatching(
+            PpapiHostMsg_VideoDecoder_GetShm::ID, params, &msg))
+      return false;
+    sink().ClearMessages();
+    return UnpackMessage<PpapiHostMsg_VideoDecoder_GetShm>(msg, size);
+  }
+
+  bool CheckDecodeMsg(ResourceMessageCallParams* params,
+                      uint32_t* shm_id,
+                      uint32_t* size) {
+    IPC::Message msg;
+    if (!sink().GetFirstResourceCallMatching(
+            PpapiHostMsg_VideoDecoder_Decode::ID, params, &msg))
+      return false;
+    sink().ClearMessages();
+    return UnpackMessage<PpapiHostMsg_VideoDecoder_Decode>(msg, shm_id, size);
+  }
+
+  bool CheckRecyclePictureMsg(ResourceMessageCallParams* params,
+                              uint32_t* texture_id) {
+    IPC::Message msg;
+    if (!sink().GetFirstResourceCallMatching(
+            PpapiHostMsg_VideoDecoder_RecyclePicture::ID, params, &msg))
+      return false;
+    sink().ClearMessages();
+    return UnpackMessage<PpapiHostMsg_VideoDecoder_RecyclePicture>(msg,
+                                                                   texture_id);
+  }
+
+  bool CheckFlushMsg(ResourceMessageCallParams* params) {
+    return CheckMsg(params, PpapiHostMsg_VideoDecoder_Flush::ID);
+  }
+
+  bool CheckResetMsg(ResourceMessageCallParams* params) {
+    return CheckMsg(params, PpapiHostMsg_VideoDecoder_Reset::ID);
+  }
+
+ private:
+  bool CheckMsg(ResourceMessageCallParams* params, int id) {
+    IPC::Message msg;
+    if (!sink().GetFirstResourceCallMatching(id, params, &msg))
+      return false;
+    sink().ClearMessages();
+    return true;
+  }
+};
+
+}  // namespace
+
+TEST_F(VideoDecoderResourceTest, Initialize) {
+  // Initialize with 0 graphics3d_context should fail.
+  {
+    LockingResourceReleaser decoder(CreateDecoder());
+    MockCompletionCallback cb;
+    int32_t result =
+        decoder_iface->Initialize(decoder.get(),
+                                  0 /* invalid 3d graphics */,
+                                  PP_VIDEOPROFILE_H264MAIN,
+                                  kAllowSoftwareFallback,
+                                  PP_MakeOptionalCompletionCallback(
+                                      &MockCompletionCallback::Callback, &cb));
+    ASSERT_EQ(PP_ERROR_BADRESOURCE, result);
+  }
+  // Initialize with bad non-zero graphics3d_context should fail.
+  {
+    LockingResourceReleaser decoder(CreateDecoder());
+    MockCompletionCallback cb;
+    int32_t result =
+        decoder_iface->Initialize(decoder.get(),
+                                  1 /* invalid 3d graphics */,
+                                  PP_VIDEOPROFILE_H264MAIN,
+                                  kAllowSoftwareFallback,
+                                  PP_MakeOptionalCompletionCallback(
+                                      &MockCompletionCallback::Callback, &cb));
+    ASSERT_EQ(PP_ERROR_BADRESOURCE, result);
+  }
+  // Initialize with valid graphics3d_context and profile should succeed.
+  {
+    LockingResourceReleaser decoder(CreateDecoder());
+    LockingResourceReleaser graphics3d(CreateGraphics3d());
+    MockCompletionCallback cb;
+    int32_t result =
+        decoder_iface->Initialize(decoder.get(),
+                                  graphics3d.get(),
+                                  PP_VIDEOPROFILE_H264MAIN,
+                                  kAllowSoftwareFallback,
+                                  PP_MakeOptionalCompletionCallback(
+                                      &MockCompletionCallback::Callback, &cb));
+    ASSERT_EQ(PP_OK_COMPLETIONPENDING, result);
+    ASSERT_TRUE(decoder_iface->IsVideoDecoder(decoder.get()));
+
+    // Another attempt while pending should fail.
+    result =
+        decoder_iface->Initialize(decoder.get(),
+                                  graphics3d.get(),
+                                  PP_VIDEOPROFILE_H264MAIN,
+                                  kAllowSoftwareFallback,
+                                  PP_MakeOptionalCompletionCallback(
+                                      &MockCompletionCallback::Callback, &cb));
+    ASSERT_EQ(PP_ERROR_INPROGRESS, result);
+
+    // Check for host message and send a reply to complete initialization.
+    ResourceMessageCallParams params;
+    IPC::Message msg;
+    ASSERT_TRUE(sink().GetFirstResourceCallMatching(
+        PpapiHostMsg_VideoDecoder_Initialize::ID, &params, &msg));
+    sink().ClearMessages();
+    SendReply(params, PP_OK, PpapiPluginMsg_VideoDecoder_InitializeReply());
+    ASSERT_TRUE(cb.called());
+    ASSERT_EQ(PP_OK, cb.result());
+  }
+}
+
+TEST_F(VideoDecoderResourceTest, Uninitialized) {
+  // Operations on uninitialized decoders should fail.
+  LockingResourceReleaser decoder(CreateDecoder());
+  MockCompletionCallback uncalled_cb;
+
+  ASSERT_EQ(PP_ERROR_FAILED, CallDecode(decoder.get(), &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+
+  ASSERT_EQ(PP_ERROR_FAILED, CallGetPicture(decoder.get(), NULL, &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+
+  ASSERT_EQ(PP_ERROR_FAILED, CallFlush(decoder.get(), &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+
+  ASSERT_EQ(PP_ERROR_FAILED, CallReset(decoder.get(), &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+}
+
+TEST_F(VideoDecoderResourceTest, DecodeAndGetPicture) {
+  LockingResourceReleaser decoder(CreateAndInitializeDecoder());
+  ResourceMessageCallParams params, params2;  // TODO rename?
+  MockCompletionCallback decode_cb, get_picture_cb, uncalled_cb;
+  ASSERT_EQ(PP_OK_COMPLETIONPENDING, CallDecode(decoder.get(), &decode_cb));
+  ASSERT_FALSE(decode_cb.called());
+
+  // Calling Decode when another Decode is pending should fail.
+  ASSERT_EQ(PP_ERROR_INPROGRESS, CallDecode(decoder.get(), &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+
+  // Check for host message to create shm and send a reply with handle.
+  uint32_t shm_buffer_size;
+  ASSERT_TRUE(CheckGetShmMsg(&params, &shm_buffer_size));
+  ASSERT_GE(shm_buffer_size, kDecodeBufferSize);
+  SendGetShmReply(params, shm_buffer_size);
+  // The decoder should copy the user data and send a Decode message.
+  uint32_t shm_id;
+  uint32_t decode_size;
+  ASSERT_TRUE(CheckDecodeMsg(&params, &shm_id, &decode_size));
+  // Buffer id is 0.
+  ASSERT_EQ(0U, shm_id);
+  ASSERT_EQ(kDecodeBufferSize, decode_size);
+  // The decoder should run the callback.
+  ASSERT_TRUE(decode_cb.called());
+  ASSERT_EQ(PP_OK, decode_cb.result());
+  decode_cb.Reset();
+
+  // The decoder only has 1 shm buffer and it is still in use. The next Decode
+  // call should also cause a shm buffer to be created.
+  ASSERT_EQ(PP_OK_COMPLETIONPENDING, CallDecode(decoder.get(), &decode_cb));
+  ASSERT_FALSE(decode_cb.called());
+  // Check for another host message to create shm and send a reply with handle.
+  ASSERT_TRUE(CheckGetShmMsg(&params2, &shm_buffer_size));
+  SendGetShmReply(params2, shm_buffer_size);
+
+  // The decoder should copy the user data and send the host message to Decode.
+  ASSERT_TRUE(CheckDecodeMsg(&params2, &shm_id, &decode_size));
+  // Buffer id should be 1.
+  ASSERT_EQ(1U, shm_id);
+  ASSERT_EQ(kDecodeBufferSize, decode_size);
+  // The decoder should run the plugin's callback.
+  ASSERT_TRUE(decode_cb.called());
+  ASSERT_EQ(PP_OK, decode_cb.result());
+  decode_cb.Reset();
+
+  // Now send a reply for both in-flight decodes. This should free up shm
+  // buffers 0 and 1, and set the picture ids for them.
+  SendDecodeReply(params, 0U);
+  SendDecodeReply(params2, 1U);
+
+  // Calling Decode when a shm buffer is available should complete
+  // synchronously.
+  ASSERT_EQ(PP_OK, CallDecode(decoder.get(), &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+
+  // Now try to get a picture. No picture ready message has been received yet.
+  PP_VideoPicture picture;
+  ASSERT_EQ(PP_OK_COMPLETIONPENDING,
+            CallGetPicture(decoder.get(), &picture, &get_picture_cb));
+  ASSERT_FALSE(get_picture_cb.called());
+  // Calling GetPicture when another GetPicture is pending should fail.
+  ASSERT_EQ(PP_ERROR_INPROGRESS,
+            CallGetPicture(decoder.get(), &picture, &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+  // Send a picture ready message for shm 0. The callback should complete.
+  SendPictureReady(params, 0U, kTextureId1);
+  ASSERT_TRUE(get_picture_cb.called());
+  ASSERT_EQ(PP_OK, get_picture_cb.result());
+  ASSERT_EQ(kDecodeId, picture.decode_id);
+  get_picture_cb.Reset();
+
+  // Send another picture ready message. Since there is no pending GetPicture
+  // call, the picture should be queued.
+  SendPictureReady(params, 1U, kTextureId2);
+  // The next GetPicture should return synchronously.
+  ASSERT_EQ(PP_OK, CallGetPicture(decoder.get(), &picture, &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+  ASSERT_EQ(kDecodeId, picture.decode_id);
+}
+
+TEST_F(VideoDecoderResourceTest, RecyclePicture) {
+  LockingResourceReleaser decoder(CreateAndInitializeDecoder());
+  ResourceMessageCallParams params;
+  MockCompletionCallback cb;
+
+  // Call GetPicture and send reply to create a texture to recycle.
+  PP_VideoPicture picture;
+  CallGetPicture(decoder.get(), &picture, &cb);
+  SendPictureReady(params, 0U, kTextureId1);
+
+  CallRecyclePicture(decoder.get(), picture);
+  uint32_t texture_id;
+  ASSERT_TRUE(CheckRecyclePictureMsg(&params, &texture_id));
+}
+
+TEST_F(VideoDecoderResourceTest, Flush) {
+  LockingResourceReleaser decoder(CreateAndInitializeDecoder());
+  ResourceMessageCallParams params, params2;
+  MockCompletionCallback flush_cb, get_picture_cb, uncalled_cb;
+
+  ASSERT_EQ(PP_OK_COMPLETIONPENDING, CallFlush(decoder.get(), &flush_cb));
+  ASSERT_FALSE(flush_cb.called());
+  ASSERT_TRUE(CheckFlushMsg(&params));
+
+  ASSERT_EQ(PP_ERROR_FAILED, CallDecode(decoder.get(), &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+
+  // Plugin can call GetPicture while Flush is pending.
+  ASSERT_EQ(PP_OK_COMPLETIONPENDING,
+            CallGetPicture(decoder.get(), NULL, &get_picture_cb));
+  ASSERT_FALSE(get_picture_cb.called());
+
+  ASSERT_EQ(PP_ERROR_INPROGRESS, CallFlush(decoder.get(), &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+
+  ASSERT_EQ(PP_ERROR_FAILED, CallReset(decoder.get(), &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+
+  // Plugin can call RecyclePicture while Flush is pending.
+  PP_VideoPicture picture;
+  picture.texture_id = kTextureId1;
+  CallRecyclePicture(decoder.get(), picture);
+  uint32_t texture_id;
+  ASSERT_TRUE(CheckRecyclePictureMsg(&params2, &texture_id));
+
+  SendFlushReply(params);
+  // Any pending GetPicture call is aborted.
+  ASSERT_TRUE(get_picture_cb.called());
+  ASSERT_EQ(PP_ERROR_ABORTED, get_picture_cb.result());
+  ASSERT_TRUE(flush_cb.called());
+  ASSERT_EQ(PP_OK, flush_cb.result());
+}
+
+TEST_F(VideoDecoderResourceTest, Reset) {
+  LockingResourceReleaser decoder(CreateAndInitializeDecoder());
+  ResourceMessageCallParams params;
+  MockCompletionCallback reset_cb, decode_cb, get_picture_cb, uncalled_cb;
+
+  // Call Decode and GetPicture to have some pending requests.
+  ASSERT_EQ(PP_OK_COMPLETIONPENDING, CallDecode(decoder.get(), &decode_cb));
+  ASSERT_EQ(PP_OK_COMPLETIONPENDING,
+            CallGetPicture(decoder.get(), NULL, &get_picture_cb));
+
+  ASSERT_EQ(PP_OK_COMPLETIONPENDING, CallReset(decoder.get(), &reset_cb));
+  ASSERT_FALSE(reset_cb.called());
+  ASSERT_TRUE(CheckResetMsg(&params));
+  // Pending calls should be aborted.
+  ASSERT_TRUE(decode_cb.called());
+  ASSERT_EQ(PP_ERROR_ABORTED, decode_cb.result());
+  ASSERT_TRUE(get_picture_cb.called());
+  ASSERT_EQ(PP_ERROR_ABORTED, get_picture_cb.result());
+
+  // No calls can be made while Reset is pending.
+  ASSERT_EQ(PP_ERROR_FAILED, CallDecode(decoder.get(), &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+  ASSERT_EQ(PP_ERROR_FAILED, CallGetPicture(decoder.get(), NULL, &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+  ASSERT_EQ(PP_ERROR_FAILED, CallFlush(decoder.get(), &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+  ASSERT_EQ(PP_ERROR_INPROGRESS, CallReset(decoder.get(), &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+
+  SendResetReply(params);
+  ASSERT_TRUE(reset_cb.called());
+  ASSERT_EQ(PP_OK, reset_cb.result());
+}
+
+TEST_F(VideoDecoderResourceTest, NotifyError) {
+  LockingResourceReleaser decoder(CreateAndInitializeDecoder());
+  ResourceMessageCallParams params;
+  MockCompletionCallback decode_cb, get_picture_cb, uncalled_cb;
+
+  // Call Decode and GetPicture to have some pending requests.
+  ASSERT_EQ(PP_OK_COMPLETIONPENDING, CallDecode(decoder.get(), &decode_cb));
+  ASSERT_FALSE(decode_cb.called());
+  ASSERT_EQ(PP_OK_COMPLETIONPENDING,
+            CallGetPicture(decoder.get(), NULL, &get_picture_cb));
+  ASSERT_FALSE(get_picture_cb.called());
+
+  // Send the decoder resource an unsolicited notify error message. We first
+  // need to initialize 'params' so the message is routed to the decoder.
+  uint32_t shm_buffer_size;
+  CheckGetShmMsg(&params, &shm_buffer_size);
+  SendNotifyError(params, PP_ERROR_PLATFORM_FAILED);
+
+  // Both pending messages should be run with the reported error.
+  ASSERT_TRUE(decode_cb.called());
+  ASSERT_EQ(PP_ERROR_PLATFORM_FAILED, decode_cb.result());
+  ASSERT_TRUE(get_picture_cb.called());
+  ASSERT_EQ(PP_ERROR_PLATFORM_FAILED, get_picture_cb.result());
+
+  // All further calls return the reported error.
+  ASSERT_EQ(PP_ERROR_PLATFORM_FAILED, CallDecode(decoder.get(), &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+  ASSERT_EQ(PP_ERROR_PLATFORM_FAILED,
+            CallGetPicture(decoder.get(), NULL, &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+  ASSERT_EQ(PP_ERROR_PLATFORM_FAILED, CallFlush(decoder.get(), &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+  ASSERT_EQ(PP_ERROR_PLATFORM_FAILED, CallReset(decoder.get(), &uncalled_cb));
+  ASSERT_FALSE(uncalled_cb.called());
+}
+
+}  // namespace proxy
+}  // namespace ppapi