| // Copyright (c) 2012 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/decrypting_video_decoder.h" |
| |
| #include "base/bind.h" |
| #include "base/callback_helpers.h" |
| #include "base/location.h" |
| #include "base/logging.h" |
| #include "base/single_thread_task_runner.h" |
| #include "base/strings/string_number_conversions.h" |
| #include "base/trace_event/trace_event.h" |
| #include "media/base/bind_to_current_loop.h" |
| #include "media/base/cdm_context.h" |
| #include "media/base/decoder_buffer.h" |
| #include "media/base/media_log.h" |
| #include "media/base/video_frame.h" |
| |
| namespace media { |
| |
| const char DecryptingVideoDecoder::kDecoderName[] = "DecryptingVideoDecoder"; |
| |
| DecryptingVideoDecoder::DecryptingVideoDecoder( |
| const scoped_refptr<base::SingleThreadTaskRunner>& task_runner, |
| MediaLog* media_log) |
| : task_runner_(task_runner), |
| media_log_(media_log), |
| state_(kUninitialized), |
| decryptor_(NULL), |
| key_added_while_decode_pending_(false), |
| trace_id_(0), |
| support_clear_content_(false), |
| weak_factory_(this) {} |
| |
| std::string DecryptingVideoDecoder::GetDisplayName() const { |
| return kDecoderName; |
| } |
| |
| void DecryptingVideoDecoder::Initialize( |
| const VideoDecoderConfig& config, |
| bool /* low_delay */, |
| CdmContext* cdm_context, |
| const InitCB& init_cb, |
| const OutputCB& output_cb, |
| const WaitingForDecryptionKeyCB& waiting_for_decryption_key_cb) { |
| DVLOG(2) << __func__ << ": " << config.AsHumanReadableString(); |
| |
| DCHECK(task_runner_->BelongsToCurrentThread()); |
| DCHECK(state_ == kUninitialized || state_ == kIdle || |
| state_ == kDecodeFinished) |
| << state_; |
| DCHECK(decode_cb_.is_null()); |
| DCHECK(reset_cb_.is_null()); |
| DCHECK(config.IsValidConfig()); |
| |
| init_cb_ = BindToCurrentLoop(init_cb); |
| if (!cdm_context) { |
| // Once we have a CDM context, one should always be present. |
| DCHECK(!support_clear_content_); |
| base::ResetAndReturn(&init_cb_).Run(false); |
| return; |
| } |
| |
| if (!config.is_encrypted() && !support_clear_content_) { |
| base::ResetAndReturn(&init_cb_).Run(false); |
| return; |
| } |
| |
| // Once initialized with encryption support, the value is sticky, so we'll use |
| // the decryptor for clear content as well. |
| support_clear_content_ = true; |
| |
| output_cb_ = BindToCurrentLoop(output_cb); |
| weak_this_ = weak_factory_.GetWeakPtr(); |
| config_ = config; |
| |
| DCHECK(!waiting_for_decryption_key_cb.is_null()); |
| waiting_for_decryption_key_cb_ = waiting_for_decryption_key_cb; |
| |
| if (state_ == kUninitialized) { |
| if (!cdm_context->GetDecryptor()) { |
| DVLOG(1) << __func__ << ": no decryptor"; |
| base::ResetAndReturn(&init_cb_).Run(false); |
| return; |
| } |
| |
| decryptor_ = cdm_context->GetDecryptor(); |
| } else { |
| // Reinitialization (i.e. upon a config change). The new config can be |
| // encrypted or clear. |
| decryptor_->DeinitializeDecoder(Decryptor::kVideo); |
| } |
| |
| state_ = kPendingDecoderInit; |
| decryptor_->InitializeVideoDecoder( |
| config_, BindToCurrentLoop(base::Bind( |
| &DecryptingVideoDecoder::FinishInitialization, weak_this_))); |
| } |
| |
| void DecryptingVideoDecoder::Decode(scoped_refptr<DecoderBuffer> buffer, |
| const DecodeCB& decode_cb) { |
| DVLOG(3) << "Decode()"; |
| DCHECK(task_runner_->BelongsToCurrentThread()); |
| DCHECK(state_ == kIdle || state_ == kDecodeFinished || state_ == kError) |
| << state_; |
| DCHECK(!decode_cb.is_null()); |
| CHECK(decode_cb_.is_null()) << "Overlapping decodes are not supported."; |
| |
| decode_cb_ = BindToCurrentLoop(decode_cb); |
| |
| if (state_ == kError) { |
| base::ResetAndReturn(&decode_cb_).Run(DecodeStatus::DECODE_ERROR); |
| return; |
| } |
| |
| // Return empty frames if decoding has finished. |
| if (state_ == kDecodeFinished) { |
| base::ResetAndReturn(&decode_cb_).Run(DecodeStatus::OK); |
| return; |
| } |
| |
| pending_buffer_to_decode_ = std::move(buffer); |
| state_ = kPendingDecode; |
| DecodePendingBuffer(); |
| } |
| |
| void DecryptingVideoDecoder::Reset(const base::Closure& closure) { |
| DVLOG(2) << "Reset() - state: " << state_; |
| DCHECK(task_runner_->BelongsToCurrentThread()); |
| DCHECK(state_ == kIdle || state_ == kPendingDecode || |
| state_ == kWaitingForKey || state_ == kDecodeFinished || |
| state_ == kError) |
| << state_; |
| DCHECK(init_cb_.is_null()); // No Reset() during pending initialization. |
| DCHECK(reset_cb_.is_null()); |
| |
| reset_cb_ = BindToCurrentLoop(closure); |
| |
| decryptor_->ResetDecoder(Decryptor::kVideo); |
| |
| // Reset() cannot complete if the decode callback is still pending. |
| // Defer the resetting process in this case. The |reset_cb_| will be fired |
| // after the decode callback is fired - see DecryptAndDecodeBuffer() and |
| // DeliverFrame(). |
| if (state_ == kPendingDecode) { |
| DCHECK(!decode_cb_.is_null()); |
| return; |
| } |
| |
| if (state_ == kWaitingForKey) { |
| DCHECK(!decode_cb_.is_null()); |
| pending_buffer_to_decode_ = NULL; |
| base::ResetAndReturn(&decode_cb_).Run(DecodeStatus::ABORTED); |
| } |
| |
| DCHECK(decode_cb_.is_null()); |
| DoReset(); |
| } |
| |
| DecryptingVideoDecoder::~DecryptingVideoDecoder() { |
| DCHECK(task_runner_->BelongsToCurrentThread()); |
| |
| if (state_ == kUninitialized) |
| return; |
| |
| if (decryptor_) { |
| decryptor_->DeinitializeDecoder(Decryptor::kVideo); |
| decryptor_ = NULL; |
| } |
| pending_buffer_to_decode_ = NULL; |
| if (!init_cb_.is_null()) |
| base::ResetAndReturn(&init_cb_).Run(false); |
| if (!decode_cb_.is_null()) |
| base::ResetAndReturn(&decode_cb_).Run(DecodeStatus::ABORTED); |
| if (!reset_cb_.is_null()) |
| base::ResetAndReturn(&reset_cb_).Run(); |
| } |
| |
| void DecryptingVideoDecoder::FinishInitialization(bool success) { |
| DVLOG(2) << "FinishInitialization()"; |
| DCHECK(task_runner_->BelongsToCurrentThread()); |
| DCHECK_EQ(state_, kPendingDecoderInit) << state_; |
| DCHECK(!init_cb_.is_null()); |
| DCHECK(reset_cb_.is_null()); // No Reset() before initialization finished. |
| DCHECK(decode_cb_.is_null()); // No Decode() before initialization finished. |
| |
| if (!success) { |
| DVLOG(1) << __func__ << ": failed to init video decoder on decryptor"; |
| base::ResetAndReturn(&init_cb_).Run(false); |
| decryptor_ = NULL; |
| state_ = kError; |
| return; |
| } |
| |
| decryptor_->RegisterNewKeyCB( |
| Decryptor::kVideo, BindToCurrentLoop(base::Bind( |
| &DecryptingVideoDecoder::OnKeyAdded, weak_this_))); |
| |
| // Success! |
| state_ = kIdle; |
| base::ResetAndReturn(&init_cb_).Run(true); |
| } |
| |
| void DecryptingVideoDecoder::DecodePendingBuffer() { |
| DCHECK(task_runner_->BelongsToCurrentThread()); |
| DCHECK_EQ(state_, kPendingDecode) << state_; |
| TRACE_EVENT_ASYNC_BEGIN0( |
| "media", "DecryptingVideoDecoder::DecodePendingBuffer", ++trace_id_); |
| |
| int buffer_size = 0; |
| if (!pending_buffer_to_decode_->end_of_stream()) { |
| buffer_size = pending_buffer_to_decode_->data_size(); |
| } |
| |
| decryptor_->DecryptAndDecodeVideo( |
| pending_buffer_to_decode_, |
| BindToCurrentLoop(base::Bind(&DecryptingVideoDecoder::DeliverFrame, |
| weak_this_, buffer_size))); |
| } |
| |
| void DecryptingVideoDecoder::DeliverFrame( |
| int buffer_size, |
| Decryptor::Status status, |
| const scoped_refptr<VideoFrame>& frame) { |
| DVLOG(3) << "DeliverFrame() - status: " << status; |
| DCHECK(task_runner_->BelongsToCurrentThread()); |
| DCHECK_EQ(state_, kPendingDecode) << state_; |
| DCHECK(!decode_cb_.is_null()); |
| DCHECK(pending_buffer_to_decode_.get()); |
| |
| TRACE_EVENT_ASYNC_END2("media", "DecryptingVideoDecoder::DecodePendingBuffer", |
| trace_id_, "buffer_size", buffer_size, "status", |
| status); |
| |
| bool need_to_try_again_if_nokey_is_returned = key_added_while_decode_pending_; |
| key_added_while_decode_pending_ = false; |
| |
| scoped_refptr<DecoderBuffer> scoped_pending_buffer_to_decode = |
| std::move(pending_buffer_to_decode_); |
| |
| if (!reset_cb_.is_null()) { |
| base::ResetAndReturn(&decode_cb_).Run(DecodeStatus::ABORTED); |
| DoReset(); |
| return; |
| } |
| |
| DCHECK_EQ(status == Decryptor::kSuccess, frame.get() != NULL); |
| |
| if (status == Decryptor::kError) { |
| DVLOG(2) << "DeliverFrame() - kError"; |
| MEDIA_LOG(ERROR, media_log_) << GetDisplayName() << ": decode error"; |
| state_ = kError; |
| base::ResetAndReturn(&decode_cb_).Run(DecodeStatus::DECODE_ERROR); |
| return; |
| } |
| |
| if (status == Decryptor::kNoKey) { |
| std::string key_id = |
| scoped_pending_buffer_to_decode->decrypt_config()->key_id(); |
| std::string log_message = |
| "no key for key ID " + base::HexEncode(key_id.data(), key_id.size()) + |
| "; will resume decoding after new usable key is available"; |
| DVLOG(1) << __func__ << ": " << log_message; |
| MEDIA_LOG(INFO, media_log_) << GetDisplayName() << ": " << log_message; |
| |
| // Set |pending_buffer_to_decode_| back as we need to try decoding the |
| // pending buffer again when new key is added to the decryptor. |
| pending_buffer_to_decode_ = std::move(scoped_pending_buffer_to_decode); |
| |
| if (need_to_try_again_if_nokey_is_returned) { |
| // The |state_| is still kPendingDecode. |
| MEDIA_LOG(INFO, media_log_) |
| << GetDisplayName() << ": key was added, resuming decode"; |
| DecodePendingBuffer(); |
| return; |
| } |
| |
| state_ = kWaitingForKey; |
| waiting_for_decryption_key_cb_.Run(); |
| return; |
| } |
| |
| if (status == Decryptor::kNeedMoreData) { |
| DVLOG(2) << "DeliverFrame() - kNeedMoreData"; |
| state_ = scoped_pending_buffer_to_decode->end_of_stream() ? kDecodeFinished |
| : kIdle; |
| base::ResetAndReturn(&decode_cb_).Run(DecodeStatus::OK); |
| return; |
| } |
| |
| DCHECK_EQ(status, Decryptor::kSuccess); |
| CHECK(frame); |
| |
| // Frame returned with kSuccess should not be an end-of-stream frame. |
| DCHECK(!frame->metadata()->IsTrue(VideoFrameMetadata::END_OF_STREAM)); |
| |
| // If color space is not set, use the color space in the |config_|. |
| if (!frame->ColorSpace().IsValid()) { |
| DVLOG(3) << "Setting color space using information in the config."; |
| frame->metadata()->SetInteger(VideoFrameMetadata::COLOR_SPACE, |
| config_.color_space()); |
| if (config_.color_space_info() != VideoColorSpace()) |
| frame->set_color_space(config_.color_space_info().ToGfxColorSpace()); |
| } |
| |
| output_cb_.Run(frame); |
| |
| if (scoped_pending_buffer_to_decode->end_of_stream()) { |
| // Set |pending_buffer_to_decode_| back as we need to keep flushing the |
| // decryptor. |
| pending_buffer_to_decode_ = std::move(scoped_pending_buffer_to_decode); |
| DecodePendingBuffer(); |
| return; |
| } |
| |
| state_ = kIdle; |
| base::ResetAndReturn(&decode_cb_).Run(DecodeStatus::OK); |
| } |
| |
| void DecryptingVideoDecoder::OnKeyAdded() { |
| DVLOG(2) << "OnKeyAdded()"; |
| DCHECK(task_runner_->BelongsToCurrentThread()); |
| |
| if (state_ == kPendingDecode) { |
| key_added_while_decode_pending_ = true; |
| return; |
| } |
| |
| if (state_ == kWaitingForKey) { |
| MEDIA_LOG(INFO, media_log_) |
| << GetDisplayName() << ": key added, resuming decode"; |
| state_ = kPendingDecode; |
| DecodePendingBuffer(); |
| } |
| } |
| |
| void DecryptingVideoDecoder::DoReset() { |
| DCHECK(init_cb_.is_null()); |
| DCHECK(decode_cb_.is_null()); |
| state_ = kIdle; |
| base::ResetAndReturn(&reset_cb_).Run(); |
| } |
| |
| } // namespace media |