media: Support better decoder switching

media/filters/fake_video_decoder.cc

 // Copyright 2013 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 "media/filters/fake_video_decoder.h"
 
 #include "base/location.h"
 #include "media/base/bind_to_current_loop.h"
 #include "media/base/test_helpers.h"
 
 namespace media {
 
 FakeVideoDecoder::FakeVideoDecoder(const std::string& decoder_name,
                                    int decoding_delay,
                                    int max_parallel_decoding_requests,
                                    const BytesDecodedCB& bytes_decoded_cb)
     : decoder_name_(decoder_name),
       decoding_delay_(decoding_delay),
       max_parallel_decoding_requests_(max_parallel_decoding_requests),
       bytes_decoded_cb_(bytes_decoded_cb),
       state_(STATE_UNINITIALIZED),
       hold_decode_(false),
       total_bytes_decoded_(0),
       fail_to_initialize_(false),
       weak_factory_(this) {
-  DVLOG(1) << __func__;
+  DVLOG(1) << decoder_name_ << ": " << __func__;
   DCHECK_GE(decoding_delay, 0);
 }
 
 FakeVideoDecoder::~FakeVideoDecoder() {
-  DVLOG(1) << __func__;
+  DVLOG(1) << decoder_name_ << ": " << __func__;
   DCHECK(thread_checker_.CalledOnValidThread());
 
   if (state_ == STATE_UNINITIALIZED)
     return;
 
   if (!init_cb_.IsNull())
     SatisfyInit();
   if (!held_decode_callbacks_.empty())
     SatisfyDecode();
   if (!reset_cb_.IsNull())
     SatisfyReset();
 
   decoded_frames_.clear();
 }
 
 void FakeVideoDecoder::EnableEncryptedConfigSupport() {
   supports_encrypted_config_ = true;
 }
 
 std::string FakeVideoDecoder::GetDisplayName() const {
   return decoder_name_;
 }
 
 void FakeVideoDecoder::Initialize(const VideoDecoderConfig& config,
                                   bool low_delay,
                                   CdmContext* cdm_context,
                                   const InitCB& init_cb,
                                   const OutputCB& output_cb) {
-  DVLOG(1) << __func__;
+  DVLOG(1) << __func__ << "(" << decoder_name_ << ")";
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(config.IsValidConfig());
   DCHECK(held_decode_callbacks_.empty())
       << "No reinitialization during pending decode.";
   DCHECK(reset_cb_.IsNull()) << "No reinitialization during pending reset.";
 
   current_config_ = config;
   init_cb_.SetCallback(BindToCurrentLoop(init_cb));
 
   // Don't need BindToCurrentLoop() because |output_cb_| is only called from
   // RunDecodeCallback() which is posted from Decode().
   output_cb_ = output_cb;
 
   if (!decoded_frames_.empty()) {
     DVLOG(1) << "Decoded frames dropped during reinitialization.";
     decoded_frames_.clear();
   }
 
   if (config.is_encrypted() && (!supports_encrypted_config_ || !cdm_context)) {
     DVLOG(1) << "Encrypted config not supported.";
     fail_to_initialize_ = true;
   }
 
   if (fail_to_initialize_) {
+    DVLOG(1) << decoder_name_ << ": Initialization failed.";
     state_ = STATE_ERROR;
     init_cb_.RunOrHold(false);
   } else {
+    DVLOG(1) << decoder_name_ << ": Initialization succeeded.";
     state_ = STATE_NORMAL;
     init_cb_.RunOrHold(true);
   }
 }
 
 void FakeVideoDecoder::Decode(const scoped_refptr<DecoderBuffer>& buffer,
                               const DecodeCB& decode_cb) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(reset_cb_.IsNull());
   DCHECK_LE(decoded_frames_.size(),
@@ skipping 168 matching lines @@
 
 void FakeVideoDecoder::DoReset() {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(held_decode_callbacks_.empty());
   DCHECK(!reset_cb_.IsNull());
 
   reset_cb_.RunOrHold();
 }
 
 }  // namespace media