| // 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_audio_decoder.h" |
| |
| #include <stdint.h> |
| |
| #include <cstdlib> |
| #include <memory> |
| |
| #include "base/bind.h" |
| #include "base/callback_helpers.h" |
| #include "base/location.h" |
| #include "base/logging.h" |
| #include "base/sequenced_task_runner.h" |
| #include "base/strings/string_number_conversions.h" |
| #include "media/base/audio_buffer.h" |
| #include "media/base/audio_decoder_config.h" |
| #include "media/base/audio_timestamp_helper.h" |
| #include "media/base/bind_to_current_loop.h" |
| #include "media/base/decoder_buffer.h" |
| #include "media/base/media_log.h" |
| #include "media/base/timestamp_constants.h" |
| |
| namespace media { |
| |
| static inline bool IsOutOfSync(const base::TimeDelta& timestamp_1, |
| const base::TimeDelta& timestamp_2) { |
| // Out of sync of 100ms would be pretty noticeable and we should keep any |
| // drift below that. |
| const int64_t kOutOfSyncThresholdInMilliseconds = 100; |
| return std::abs(timestamp_1.InMilliseconds() - timestamp_2.InMilliseconds()) > |
| kOutOfSyncThresholdInMilliseconds; |
| } |
| |
| DecryptingAudioDecoder::DecryptingAudioDecoder( |
| const scoped_refptr<base::SequencedTaskRunner>& task_runner, |
| MediaLog* media_log) |
| : task_runner_(task_runner), media_log_(media_log) {} |
| |
| bool DecryptingAudioDecoder::SupportsDecryption() const { |
| return true; |
| } |
| |
| AudioDecoderType DecryptingAudioDecoder::GetDecoderType() const { |
| return AudioDecoderType::kDecrypting; |
| } |
| |
| void DecryptingAudioDecoder::Initialize(const AudioDecoderConfig& config, |
| CdmContext* cdm_context, |
| InitCB init_cb, |
| const OutputCB& output_cb, |
| const WaitingCB& waiting_cb) { |
| DVLOG(2) << "Initialize()"; |
| DCHECK(task_runner_->RunsTasksInCurrentSequence()); |
| DCHECK(!decode_cb_); |
| DCHECK(!reset_cb_); |
| |
| init_cb_ = BindToCurrentLoop(std::move(init_cb)); |
| if (!cdm_context) { |
| // Once we have a CDM context, one should always be present. |
| DCHECK(!support_clear_content_); |
| std::move(init_cb_).Run(StatusCode::kDecoderMissingCdmForEncryptedContent); |
| return; |
| } |
| |
| if (!config.is_encrypted() && !support_clear_content_) { |
| std::move(init_cb_).Run(StatusCode::kClearContentUnsupported); |
| 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); |
| |
| DCHECK(waiting_cb); |
| waiting_cb_ = waiting_cb; |
| |
| // TODO(xhwang): We should be able to DCHECK config.IsValidConfig(). |
| if (!config.IsValidConfig()) { |
| DLOG(ERROR) << "Invalid audio stream config."; |
| std::move(init_cb_).Run(StatusCode::kDecoderUnsupportedCodec); |
| return; |
| } |
| |
| config_ = config; |
| |
| if (state_ == kUninitialized) { |
| if (!cdm_context->GetDecryptor()) { |
| DVLOG(1) << __func__ << ": no decryptor"; |
| std::move(init_cb_).Run(StatusCode::kDecoderFailedInitialization); |
| return; |
| } |
| |
| decryptor_ = cdm_context->GetDecryptor(); |
| event_cb_registration_ = cdm_context->RegisterEventCB( |
| base::BindRepeating(&DecryptingAudioDecoder::OnCdmContextEvent, |
| weak_factory_.GetWeakPtr())); |
| } else { |
| // Reinitialization (i.e. upon a config change). The new config can be |
| // encrypted or clear. |
| decryptor_->DeinitializeDecoder(Decryptor::kAudio); |
| } |
| |
| InitializeDecoder(); |
| } |
| |
| void DecryptingAudioDecoder::Decode(scoped_refptr<DecoderBuffer> buffer, |
| DecodeCB decode_cb) { |
| DVLOG(3) << "Decode()"; |
| DCHECK(task_runner_->RunsTasksInCurrentSequence()); |
| DCHECK(state_ == kIdle || state_ == kDecodeFinished) << state_; |
| DCHECK(decode_cb); |
| CHECK(!decode_cb_) << "Overlapping decodes are not supported."; |
| |
| decode_cb_ = BindToCurrentLoop(std::move(decode_cb)); |
| |
| // Return empty (end-of-stream) frames if decoding has finished. |
| if (state_ == kDecodeFinished) { |
| output_cb_.Run(AudioBuffer::CreateEOSBuffer()); |
| std::move(decode_cb_).Run(DecodeStatus::OK); |
| return; |
| } |
| |
| // Initialize the |next_output_timestamp_| to be the timestamp of the first |
| // non-EOS buffer. |
| if (timestamp_helper_->base_timestamp() == kNoTimestamp && |
| !buffer->end_of_stream()) { |
| timestamp_helper_->SetBaseTimestamp(buffer->timestamp()); |
| } |
| |
| pending_buffer_to_decode_ = std::move(buffer); |
| state_ = kPendingDecode; |
| DecodePendingBuffer(); |
| } |
| |
| void DecryptingAudioDecoder::Reset(base::OnceClosure closure) { |
| DVLOG(2) << "Reset() - state: " << state_; |
| DCHECK(task_runner_->RunsTasksInCurrentSequence()); |
| DCHECK(state_ == kIdle || state_ == kPendingDecode || |
| state_ == kWaitingForKey || state_ == kDecodeFinished) |
| << state_; |
| DCHECK(!init_cb_); // No Reset() during pending initialization. |
| DCHECK(!reset_cb_); |
| |
| reset_cb_ = BindToCurrentLoop(std::move(closure)); |
| |
| decryptor_->ResetDecoder(Decryptor::kAudio); |
| |
| // Reset() cannot complete if the read callback is still pending. |
| // Defer the resetting process in this case. The |reset_cb_| will be fired |
| // after the read callback is fired - see DecryptAndDecodeBuffer() and |
| // DeliverFrame(). |
| if (state_ == kPendingDecode) { |
| DCHECK(decode_cb_); |
| return; |
| } |
| |
| if (state_ == kWaitingForKey) { |
| DCHECK(decode_cb_); |
| pending_buffer_to_decode_.reset(); |
| std::move(decode_cb_).Run(DecodeStatus::ABORTED); |
| } |
| |
| DCHECK(!decode_cb_); |
| DoReset(); |
| } |
| |
| DecryptingAudioDecoder::~DecryptingAudioDecoder() { |
| DVLOG(2) << __func__; |
| DCHECK(task_runner_->RunsTasksInCurrentSequence()); |
| |
| if (state_ == kUninitialized) |
| return; |
| |
| if (decryptor_) { |
| decryptor_->DeinitializeDecoder(Decryptor::kAudio); |
| decryptor_ = nullptr; |
| } |
| pending_buffer_to_decode_.reset(); |
| if (init_cb_) |
| std::move(init_cb_).Run(StatusCode::kDecoderInitializeNeverCompleted); |
| if (decode_cb_) |
| std::move(decode_cb_).Run(DecodeStatus::ABORTED); |
| if (reset_cb_) |
| std::move(reset_cb_).Run(); |
| } |
| |
| void DecryptingAudioDecoder::InitializeDecoder() { |
| state_ = kPendingDecoderInit; |
| decryptor_->InitializeAudioDecoder( |
| config_, BindToCurrentLoop( |
| base::BindOnce(&DecryptingAudioDecoder::FinishInitialization, |
| weak_factory_.GetWeakPtr()))); |
| } |
| |
| void DecryptingAudioDecoder::FinishInitialization(bool success) { |
| DVLOG(2) << "FinishInitialization()"; |
| DCHECK(task_runner_->RunsTasksInCurrentSequence()); |
| DCHECK(state_ == kPendingDecoderInit) << state_; |
| DCHECK(init_cb_); |
| DCHECK(!reset_cb_); // No Reset() before initialization finished. |
| DCHECK(!decode_cb_); // No Decode() before initialization finished. |
| |
| if (!success) { |
| DVLOG(1) << __func__ << ": failed to init audio decoder on decryptor"; |
| std::move(init_cb_).Run(StatusCode::kDecoderInitializeNeverCompleted); |
| decryptor_ = nullptr; |
| event_cb_registration_.reset(); |
| state_ = kError; |
| return; |
| } |
| |
| // Success! |
| timestamp_helper_ = |
| std::make_unique<AudioTimestampHelper>(config_.samples_per_second()); |
| |
| state_ = kIdle; |
| std::move(init_cb_).Run(OkStatus()); |
| } |
| |
| void DecryptingAudioDecoder::DecodePendingBuffer() { |
| DCHECK(task_runner_->RunsTasksInCurrentSequence()); |
| DCHECK_EQ(state_, kPendingDecode) << state_; |
| |
| int buffer_size = 0; |
| if (!pending_buffer_to_decode_->end_of_stream()) { |
| buffer_size = pending_buffer_to_decode_->data_size(); |
| } |
| |
| decryptor_->DecryptAndDecodeAudio( |
| pending_buffer_to_decode_, BindToCurrentLoop(base::BindRepeating( |
| &DecryptingAudioDecoder::DeliverFrame, |
| weak_factory_.GetWeakPtr(), buffer_size))); |
| } |
| |
| void DecryptingAudioDecoder::DeliverFrame( |
| int buffer_size, |
| Decryptor::Status status, |
| const Decryptor::AudioFrames& frames) { |
| DVLOG(3) << "DeliverFrame() - status: " << status; |
| DCHECK(task_runner_->RunsTasksInCurrentSequence()); |
| DCHECK_EQ(state_, kPendingDecode) << state_; |
| DCHECK(decode_cb_); |
| DCHECK(pending_buffer_to_decode_.get()); |
| |
| 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_) { |
| std::move(decode_cb_).Run(DecodeStatus::ABORTED); |
| DoReset(); |
| return; |
| } |
| |
| DCHECK_EQ(status == Decryptor::kSuccess, !frames.empty()); |
| |
| if (status == Decryptor::kError) { |
| DVLOG(2) << "DeliverFrame() - kError"; |
| MEDIA_LOG(ERROR, media_log_) << GetDecoderType() << ": decode error"; |
| state_ = kDecodeFinished; // TODO add kError state |
| std::move(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_) << GetDecoderType() << ": " << 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_) |
| << GetDecoderType() << ": key was added, resuming decode"; |
| DecodePendingBuffer(); |
| return; |
| } |
| |
| state_ = kWaitingForKey; |
| waiting_cb_.Run(WaitingReason::kNoDecryptionKey); |
| return; |
| } |
| |
| if (status == Decryptor::kNeedMoreData) { |
| DVLOG(2) << "DeliverFrame() - kNeedMoreData"; |
| state_ = scoped_pending_buffer_to_decode->end_of_stream() ? kDecodeFinished |
| : kIdle; |
| std::move(decode_cb_).Run(DecodeStatus::OK); |
| return; |
| } |
| |
| DCHECK_EQ(status, Decryptor::kSuccess); |
| DCHECK(!frames.empty()); |
| ProcessDecodedFrames(frames); |
| |
| if (scoped_pending_buffer_to_decode->end_of_stream()) { |
| // Set |pending_buffer_to_decode_| back as we need to keep flushing the |
| // decryptor until kNeedMoreData is returned. |
| pending_buffer_to_decode_ = std::move(scoped_pending_buffer_to_decode); |
| DecodePendingBuffer(); |
| return; |
| } |
| |
| state_ = kIdle; |
| std::move(decode_cb_).Run(DecodeStatus::OK); |
| } |
| |
| void DecryptingAudioDecoder::OnCdmContextEvent(CdmContext::Event event) { |
| DCHECK(task_runner_->RunsTasksInCurrentSequence()); |
| |
| if (event != CdmContext::Event::kHasAdditionalUsableKey) |
| return; |
| |
| if (state_ == kPendingDecode) { |
| key_added_while_decode_pending_ = true; |
| return; |
| } |
| |
| if (state_ == kWaitingForKey) { |
| MEDIA_LOG(INFO, media_log_) |
| << GetDecoderType() << ": key added, resuming decode"; |
| state_ = kPendingDecode; |
| DecodePendingBuffer(); |
| } |
| } |
| |
| void DecryptingAudioDecoder::DoReset() { |
| DCHECK(!init_cb_); |
| DCHECK(!decode_cb_); |
| timestamp_helper_->SetBaseTimestamp(kNoTimestamp); |
| state_ = kIdle; |
| std::move(reset_cb_).Run(); |
| } |
| |
| void DecryptingAudioDecoder::ProcessDecodedFrames( |
| const Decryptor::AudioFrames& frames) { |
| for (auto iter = frames.begin(); iter != frames.end(); ++iter) { |
| scoped_refptr<AudioBuffer> frame = *iter; |
| |
| DCHECK(!frame->end_of_stream()) << "EOS frame returned."; |
| DCHECK_GT(frame->frame_count(), 0) << "Empty frame returned."; |
| |
| base::TimeDelta current_time = timestamp_helper_->GetTimestamp(); |
| if (IsOutOfSync(current_time, frame->timestamp())) { |
| DVLOG(1) << "Timestamp returned by the decoder (" |
| << frame->timestamp().InMilliseconds() << " ms)" |
| << " does not match the input timestamp and number of samples" |
| << " decoded (" << current_time.InMilliseconds() << " ms)."; |
| } |
| |
| frame->set_timestamp(current_time); |
| timestamp_helper_->AddFrames(frame->frame_count()); |
| |
| output_cb_.Run(frame); |
| } |
| } |
| |
| } // namespace media |