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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/cast_streaming/browser/frame/mirroring_decoder_buffer_factory.h"
#include <algorithm>
#include "base/logging.h"
#include "components/cast_streaming/common/public/features.h"
#include "media/base/decoder_buffer.h"
#include "media/base/media_util.h"
#include "third_party/openscreen/src/cast/streaming/encoded_frame.h"
namespace cast_streaming {
MirroringDecoderBufferFactory::MirroringDecoderBufferFactory(
int receiver_rtp_timebase,
base::TimeDelta frame_duration)
: receiver_rtp_timebase_(receiver_rtp_timebase),
frame_duration_(frame_duration) {}
MirroringDecoderBufferFactory::~MirroringDecoderBufferFactory() = default;
scoped_refptr<media::DecoderBuffer>
MirroringDecoderBufferFactory::ToDecoderBuffer(
const openscreen::cast::EncodedFrame& encoded_frame,
FrameContents& frame_contents) {
scoped_refptr<media::DecoderBuffer> decoder_buffer =
base::MakeRefCounted<media::DecoderBuffer>(frame_contents.Size());
decoder_buffer->set_duration(frame_duration_);
decoder_buffer->set_is_key_frame(
encoded_frame.dependency ==
openscreen::cast::EncodedFrame::Dependency::kKeyFrame);
base::TimeDelta playout_time = base::Microseconds(
encoded_frame.rtp_timestamp
.ToTimeSinceOrigin<std::chrono::microseconds>(receiver_rtp_timebase_)
.count());
// Some senders do not send an initial playout time of 0. To work around this,
// a playout offset is added here. This is NOT done when remoting is enabled
// because the timestamp of the first frame is used to automatically start
// playback in such cases.
if (!IsCastRemotingEnabled()) {
if (playout_offset_ == base::TimeDelta::Max()) {
playout_offset_ = playout_time;
}
playout_time -= playout_offset_;
}
decoder_buffer->set_timestamp(playout_time);
return decoder_buffer;
}
} // namespace cast_streaming
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