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// Copyright 2020 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/formats/webcodecs/webcodecs_encoded_chunk_stream_parser.h"
#include <string>
#include "base/callback.h"
#include "base/logging.h"
#include "base/notreached.h"
#include "media/base/media_log.h"
#include "media/base/media_track.h"
#include "media/base/media_tracks.h"
#include "media/base/stream_parser_buffer.h"
#include "media/base/text_track_config.h"
#include "media/base/timestamp_constants.h"
namespace {
// TODO(crbug.com/1144908): Since these must be identical to those generated
// in the SourceBuffer, consider moving these to possibly stream_parser.h.
// Meanwhile, must be kept in sync with similar constexpr in SourceBuffer
// manually.
constexpr media::StreamParser::TrackId kWebCodecsAudioTrackId = 1;
constexpr media::StreamParser::TrackId kWebCodecsVideoTrackId = 2;
} // namespace
namespace media {
WebCodecsEncodedChunkStreamParser::WebCodecsEncodedChunkStreamParser(
std::unique_ptr<AudioDecoderConfig> audio_config)
: state_(kWaitingForInit), audio_config_(std::move(audio_config)) {
DCHECK(audio_config_ && !video_config_);
}
WebCodecsEncodedChunkStreamParser::WebCodecsEncodedChunkStreamParser(
std::unique_ptr<VideoDecoderConfig> video_config)
: state_(kWaitingForInit), video_config_(std::move(video_config)) {
DCHECK(video_config_ && !audio_config_);
}
WebCodecsEncodedChunkStreamParser::~WebCodecsEncodedChunkStreamParser() =
default;
void WebCodecsEncodedChunkStreamParser::Init(
InitCB init_cb,
const NewConfigCB& config_cb,
const NewBuffersCB& new_buffers_cb,
bool /* ignore_text_tracks */,
const EncryptedMediaInitDataCB& /* ignored */,
const NewMediaSegmentCB& new_segment_cb,
const EndMediaSegmentCB& end_of_segment_cb,
MediaLog* media_log) {
DCHECK_EQ(state_, kWaitingForInit);
DCHECK(!init_cb_);
DCHECK(init_cb);
DCHECK(config_cb);
DCHECK(new_buffers_cb);
DCHECK(new_segment_cb);
DCHECK(end_of_segment_cb);
ChangeState(kWaitingForConfigEmission);
init_cb_ = std::move(init_cb);
config_cb_ = config_cb;
new_buffers_cb_ = new_buffers_cb;
new_segment_cb_ = new_segment_cb;
end_of_segment_cb_ = end_of_segment_cb;
media_log_ = media_log;
}
void WebCodecsEncodedChunkStreamParser::Flush() {
DCHECK_NE(state_, kWaitingForInit);
if (state_ == kWaitingForEncodedChunks)
ChangeState(kWaitingForConfigEmission);
}
bool WebCodecsEncodedChunkStreamParser::GetGenerateTimestampsFlag() const {
return false;
}
bool WebCodecsEncodedChunkStreamParser::Parse(const uint8_t* /* buf */,
int /* size */) {
// TODO(crbug.com/1144908): Protect against app reaching this (and similer
// inverse case in other parsers) simply by using the wrong append method on
// the SourceBuffer. Maybe a better MEDIA_LOG here would be sufficient? Or
// instead have the top-level SourceBuffer throw synchronous exception when
// attempting the wrong append method, without causing parse/decode error?
NOTREACHED(); // ProcessChunks() is the method to use instead for this
// parser.
return false;
}
bool WebCodecsEncodedChunkStreamParser::ProcessChunks(
std::unique_ptr<BufferQueue> buffer_queue) {
DCHECK_NE(state_, kWaitingForInit);
if (state_ == kError)
return false;
if (state_ == kWaitingForConfigEmission) {
// Must (still) have only one config. We'll retain ownership.
// MediaTracks::AddAudio/VideoTrack copies the config.
DCHECK((audio_config_ && !video_config_) ||
(video_config_ && !audio_config_));
auto media_tracks = std::make_unique<MediaTracks>();
if (audio_config_) {
media_tracks->AddAudioTrack(
*audio_config_, kWebCodecsAudioTrackId, MediaTrack::Kind("main"),
MediaTrack::Label(""), MediaTrack::Language(""));
} else if (video_config_) {
media_tracks->AddVideoTrack(
*video_config_, kWebCodecsVideoTrackId, MediaTrack::Kind("main"),
MediaTrack::Label(""), MediaTrack::Language(""));
}
if (!config_cb_.Run(std::move(media_tracks), TextTrackConfigMap())) {
ChangeState(kError);
return false;
}
if (init_cb_) {
InitParameters params(kInfiniteDuration);
params.liveness = StreamLiveness::kUnknown;
if (audio_config_)
params.detected_audio_track_count = 1;
if (video_config_)
params.detected_video_track_count = 1;
params.detected_text_track_count = 0;
std::move(init_cb_).Run(params);
}
ChangeState(kWaitingForEncodedChunks);
}
DCHECK_EQ(state_, kWaitingForEncodedChunks);
// All of |buffer_queue| must be of the media type (audio or video)
// corresponding to the exactly one type of decoder config we have. Otherwise,
// the caller has provided encoded chunks for the wrong kind of config.
DemuxerStream::Type expected_type =
audio_config_ ? DemuxerStream::AUDIO : DemuxerStream::VIDEO;
for (const auto& it : *buffer_queue) {
if (it->type() != expected_type) {
MEDIA_LOG(ERROR, media_log_)
<< "Incorrect EncodedChunk type (audio vs video) appended";
ChangeState(kError);
return false;
}
}
// TODO(crbug.com/1144908): Add a different new_buffers_cb type for us to use
// so that we can just std::move the buffer_queue, and avoid potential issues
// with out-of-order timestamps in the caller-provided queue that would
// otherwise cause parse failure in MergeBufferQueues with the current, legacy
// style of new_buffers_cb that depends on parsers to emit sanely time-ordered
// groups of frames from *muxed* multi-track bytestreams. FrameProcessor is
// capable of handling our buffer_queue verbatim.
BufferQueueMap buffers;
if (audio_config_)
buffers.insert(std::make_pair(kWebCodecsAudioTrackId, *buffer_queue));
else
buffers.insert(std::make_pair(kWebCodecsVideoTrackId, *buffer_queue));
new_segment_cb_.Run();
if (!new_buffers_cb_.Run(buffers))
return false;
end_of_segment_cb_.Run();
return true;
}
void WebCodecsEncodedChunkStreamParser::ChangeState(State new_state) {
DVLOG(1) << __func__ << ": " << state_ << " -> " << new_state;
state_ = new_state;
}
} // namespace media
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