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// Copyright 2014 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/decoder_stream_traits.h"
#include <limits>
#include "base/logging.h"
#include "base/metrics/histogram_macros.h"
#include "media/base/audio_buffer.h"
#include "media/base/audio_decoder.h"
#include "media/base/audio_decoder_config.h"
#include "media/base/video_decoder.h"
#include "media/base/video_frame.h"
namespace media {
// Audio decoder stream traits implementation.
// static
std::string DecoderStreamTraits<DemuxerStream::AUDIO>::ToString() {
return "audio";
}
// static
bool DecoderStreamTraits<DemuxerStream::AUDIO>::NeedsBitstreamConversion(
DecoderType* decoder) {
return decoder->NeedsBitstreamConversion();
}
// static
scoped_refptr<DecoderStreamTraits<DemuxerStream::AUDIO>::OutputType>
DecoderStreamTraits<DemuxerStream::AUDIO>::CreateEOSOutput() {
return OutputType::CreateEOSBuffer();
}
DecoderStreamTraits<DemuxerStream::AUDIO>::DecoderStreamTraits(
const scoped_refptr<MediaLog>& media_log)
: media_log_(media_log) {}
void DecoderStreamTraits<DemuxerStream::AUDIO>::ReportStatistics(
const StatisticsCB& statistics_cb,
int bytes_decoded) {
PipelineStatistics statistics;
statistics.audio_bytes_decoded = bytes_decoded;
statistics_cb.Run(statistics);
}
void DecoderStreamTraits<DemuxerStream::AUDIO>::InitializeDecoder(
DecoderType* decoder,
DemuxerStream* stream,
CdmContext* cdm_context,
const InitCB& init_cb,
const OutputCB& output_cb) {
DCHECK(stream->audio_decoder_config().IsValidConfig());
decoder->Initialize(stream->audio_decoder_config(), cdm_context, init_cb,
output_cb);
}
void DecoderStreamTraits<DemuxerStream::AUDIO>::OnStreamReset(
DemuxerStream* stream) {
DCHECK(stream);
// Stream is likely being seeked to a new timestamp, so make new validator to
// build new timestamp expectations.
audio_ts_validator_.reset(
new AudioTimestampValidator(stream->audio_decoder_config(), media_log_));
}
void DecoderStreamTraits<DemuxerStream::AUDIO>::OnDecode(
const scoped_refptr<DecoderBuffer>& buffer) {
audio_ts_validator_->CheckForTimestampGap(buffer);
}
void DecoderStreamTraits<DemuxerStream::AUDIO>::OnDecodeDone(
const scoped_refptr<OutputType>& buffer) {
audio_ts_validator_->RecordOutputDuration(buffer);
}
// Video decoder stream traits implementation.
// static
std::string DecoderStreamTraits<DemuxerStream::VIDEO>::ToString() {
return "video";
}
// static
bool DecoderStreamTraits<DemuxerStream::VIDEO>::NeedsBitstreamConversion(
DecoderType* decoder) {
return decoder->NeedsBitstreamConversion();
}
// static
scoped_refptr<DecoderStreamTraits<DemuxerStream::VIDEO>::OutputType>
DecoderStreamTraits<DemuxerStream::VIDEO>::CreateEOSOutput() {
return OutputType::CreateEOSFrame();
}
DecoderStreamTraits<DemuxerStream::VIDEO>::DecoderStreamTraits(
const scoped_refptr<MediaLog>& media_log)
// Randomly selected number of samples to keep.
: keyframe_distance_average_(16) {}
void DecoderStreamTraits<DemuxerStream::VIDEO>::ReportStatistics(
const StatisticsCB& statistics_cb,
int bytes_decoded) {
PipelineStatistics statistics;
statistics.video_bytes_decoded = bytes_decoded;
if (keyframe_distance_average_.count()) {
statistics.video_keyframe_distance_average =
keyframe_distance_average_.Average();
} else {
// Before we have enough keyframes to calculate the average distance, we
// will assume the average keyframe distance is infinitely large.
statistics.video_keyframe_distance_average = base::TimeDelta::Max();
}
statistics_cb.Run(statistics);
}
void DecoderStreamTraits<DemuxerStream::VIDEO>::InitializeDecoder(
DecoderType* decoder,
DemuxerStream* stream,
CdmContext* cdm_context,
const InitCB& init_cb,
const OutputCB& output_cb) {
DCHECK(stream->video_decoder_config().IsValidConfig());
decoder->Initialize(stream->video_decoder_config(),
stream->liveness() == DemuxerStream::LIVENESS_LIVE,
cdm_context, init_cb, output_cb);
}
void DecoderStreamTraits<DemuxerStream::VIDEO>::OnStreamReset(
DemuxerStream* stream) {
DCHECK(stream);
last_keyframe_timestamp_ = base::TimeDelta();
}
void DecoderStreamTraits<DemuxerStream::VIDEO>::OnDecode(
const scoped_refptr<DecoderBuffer>& buffer) {
if (!buffer)
return;
if (buffer->end_of_stream()) {
last_keyframe_timestamp_ = base::TimeDelta();
return;
}
if (!buffer->is_key_frame())
return;
base::TimeDelta current_frame_timestamp = buffer->timestamp();
if (last_keyframe_timestamp_.is_zero()) {
last_keyframe_timestamp_ = current_frame_timestamp;
return;
}
base::TimeDelta frame_distance =
current_frame_timestamp - last_keyframe_timestamp_;
UMA_HISTOGRAM_MEDIUM_TIMES("Media.Video.KeyFrameDistance", frame_distance);
last_keyframe_timestamp_ = current_frame_timestamp;
keyframe_distance_average_.AddSample(frame_distance);
}
} // namespace media
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