1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
  100


media / video / offloading_video_encoder.cc [blame]

// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "media/video/offloading_video_encoder.h"

#include "base/task/bind_post_task.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "base/trace_event/trace_event.h"
#include "media/base/video_frame.h"
#include "media/video/video_encoder_info.h"

namespace media {

OffloadingVideoEncoder::OffloadingVideoEncoder(
    std::unique_ptr<VideoEncoder> wrapped_encoder,
    const scoped_refptr<base::SequencedTaskRunner> work_runner,
    const scoped_refptr<base::SequencedTaskRunner> callback_runner)
    : wrapped_encoder_(std::move(wrapped_encoder)),
      work_runner_(std::move(work_runner)),
      callback_runner_(std::move(callback_runner)) {
  DCHECK(wrapped_encoder_);
  DCHECK(work_runner_);
  DCHECK(callback_runner_);
  DCHECK_NE(callback_runner_, work_runner_);

  // Tell the inner encoder not to bother wrapping callbacks into separate
  // runner tasks and call them directly.
  wrapped_encoder_->DisablePostedCallbacks();
}

OffloadingVideoEncoder::OffloadingVideoEncoder(
    std::unique_ptr<VideoEncoder> wrapped_encoder)
    : OffloadingVideoEncoder(
          std::move(wrapped_encoder),
          base::ThreadPool::CreateSequencedTaskRunner(
              {base::TaskPriority::USER_BLOCKING,
               base::WithBaseSyncPrimitives(), base::MayBlock()}),
          base::SequencedTaskRunner::GetCurrentDefault()) {}

void OffloadingVideoEncoder::Initialize(VideoCodecProfile profile,
                                        const Options& options,
                                        EncoderInfoCB info_cb,
                                        OutputCB output_cb,
                                        EncoderStatusCB done_cb) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  work_runner_->PostTask(
      FROM_HERE,
      base::BindOnce(&VideoEncoder::Initialize,
                     base::Unretained(wrapped_encoder_.get()), profile, options,
                     WrapCallback(std::move(info_cb)),
                     WrapCallback(std::move(output_cb)),
                     WrapCallback(std::move(done_cb))));
}

void OffloadingVideoEncoder::Encode(scoped_refptr<VideoFrame> frame,
                                    const EncodeOptions& encode_options,
                                    EncoderStatusCB done_cb) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  TRACE_EVENT0("media", "OffloadingVideoEncoder::Encode");
  work_runner_->PostTask(
      FROM_HERE,
      base::BindOnce(&VideoEncoder::Encode,
                     base::Unretained(wrapped_encoder_.get()), std::move(frame),
                     encode_options, WrapCallback(std::move(done_cb))));
}

void OffloadingVideoEncoder::ChangeOptions(const Options& options,
                                           OutputCB output_cb,
                                           EncoderStatusCB done_cb) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  work_runner_->PostTask(
      FROM_HERE, base::BindOnce(&VideoEncoder::ChangeOptions,
                                base::Unretained(wrapped_encoder_.get()),
                                options, WrapCallback(std::move(output_cb)),
                                WrapCallback(std::move(done_cb))));
}

void OffloadingVideoEncoder::Flush(EncoderStatusCB done_cb) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  work_runner_->PostTask(
      FROM_HERE, base::BindOnce(&VideoEncoder::Flush,
                                base::Unretained(wrapped_encoder_.get()),
                                WrapCallback(std::move(done_cb))));
}

OffloadingVideoEncoder::~OffloadingVideoEncoder() {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  work_runner_->DeleteSoon(FROM_HERE, std::move(wrapped_encoder_));
}

template <class T>
T OffloadingVideoEncoder::WrapCallback(T cb) {
  DCHECK(callback_runner_);
  return base::BindPostTask(callback_runner_, std::move(cb));
}

}  // namespace media