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// 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.
#ifndef MEDIA_BASE_STREAM_PARSER_BUFFER_H_
#define MEDIA_BASE_STREAM_PARSER_BUFFER_H_
#include <deque>
#include "media/base/decoder_buffer.h"
#include "media/base/demuxer_stream.h"
#include "media/base/media_export.h"
#include "media/base/stream_parser.h"
namespace media {
// Simple wrapper around base::TimeDelta that represents a decode timestamp.
// Making DecodeTimestamp a different type makes it easier to determine whether
// code is operating on presentation or decode timestamps and makes conversions
// between the two types explicit and easy to spot.
class DecodeTimestamp {
public:
DecodeTimestamp() {}
DecodeTimestamp(const DecodeTimestamp& rhs) : ts_(rhs.ts_) { }
DecodeTimestamp& operator=(const DecodeTimestamp& rhs) {
if (&rhs != this)
ts_ = rhs.ts_;
return *this;
}
// Only operators that are actually used by the code have been defined.
// Reviewers should pay close attention to the addition of new operators.
bool operator<(const DecodeTimestamp& rhs) const { return ts_ < rhs.ts_; }
bool operator>(const DecodeTimestamp& rhs) const { return ts_ > rhs.ts_; }
bool operator==(const DecodeTimestamp& rhs) const { return ts_ == rhs.ts_; }
bool operator!=(const DecodeTimestamp& rhs) const { return ts_ != rhs.ts_; }
bool operator>=(const DecodeTimestamp& rhs) const { return ts_ >= rhs.ts_; }
bool operator<=(const DecodeTimestamp& rhs) const { return ts_ <= rhs.ts_; }
base::TimeDelta operator-(const DecodeTimestamp& rhs) const {
return ts_ - rhs.ts_;
}
DecodeTimestamp& operator+=(const base::TimeDelta& rhs) {
ts_ += rhs;
return *this;
}
DecodeTimestamp& operator-=(const base::TimeDelta& rhs) {
ts_ -= rhs;
return *this;
}
DecodeTimestamp operator+(const base::TimeDelta& rhs) const {
return DecodeTimestamp(ts_ + rhs);
}
DecodeTimestamp operator-(const base::TimeDelta& rhs) const {
return DecodeTimestamp(ts_ - rhs);
}
int64 operator/(const base::TimeDelta& rhs) const {
return ts_ / rhs;
}
static DecodeTimestamp FromSecondsD(double seconds) {
return DecodeTimestamp(base::TimeDelta::FromSecondsD(seconds));
}
static DecodeTimestamp FromMilliseconds(int64 milliseconds) {
return DecodeTimestamp(base::TimeDelta::FromMilliseconds(milliseconds));
}
static DecodeTimestamp FromMicroseconds(int64 microseconds) {
return DecodeTimestamp(base::TimeDelta::FromMicroseconds(microseconds));
}
// This method is used to explicitly call out when presentation timestamps
// are being converted to a decode timestamp.
static DecodeTimestamp FromPresentationTime(base::TimeDelta timestamp) {
return DecodeTimestamp(timestamp);
}
double InSecondsF() const { return ts_.InSecondsF(); }
int64 InMilliseconds() const { return ts_.InMilliseconds(); }
int64 InMicroseconds() const { return ts_.InMicroseconds(); }
// TODO(acolwell): Remove once all the hacks are gone. This method is called
// by hacks where a decode time is being used as a presentation time.
base::TimeDelta ToPresentationTime() const { return ts_; }
private:
explicit DecodeTimestamp(base::TimeDelta timestamp) : ts_(timestamp) { }
base::TimeDelta ts_;
};
MEDIA_EXPORT extern inline DecodeTimestamp kNoDecodeTimestamp() {
return DecodeTimestamp::FromPresentationTime(kNoTimestamp());
}
class MEDIA_EXPORT StreamParserBuffer : public DecoderBuffer {
public:
// Value used to signal an invalid decoder config ID.
enum { kInvalidConfigId = -1 };
typedef DemuxerStream::Type Type;
typedef StreamParser::TrackId TrackId;
static scoped_refptr<StreamParserBuffer> CreateEOSBuffer();
static scoped_refptr<StreamParserBuffer> CopyFrom(
const uint8* data, int data_size, bool is_keyframe, Type type,
TrackId track_id);
static scoped_refptr<StreamParserBuffer> CopyFrom(
const uint8* data, int data_size,
const uint8* side_data, int side_data_size, bool is_keyframe, Type type,
TrackId track_id);
bool IsKeyframe() const { return is_keyframe_; }
// Decode timestamp. If not explicitly set, or set to kNoTimestamp(), the
// value will be taken from the normal timestamp.
DecodeTimestamp GetDecodeTimestamp() const;
void SetDecodeTimestamp(DecodeTimestamp timestamp);
// Gets/sets the ID of the decoder config associated with this buffer.
int GetConfigId() const;
void SetConfigId(int config_id);
// Returns the config ID of this buffer if it has no splice buffers or
// |index| is out of range. Otherwise returns the config ID for the
// buffer in |splice_buffers_| at position |index|.
int GetSpliceBufferConfigId(size_t index) const;
// Gets the parser's media type associated with this buffer. Value is
// meaningless for EOS buffers.
Type type() const { return type_; }
// Gets the parser's track ID associated with this buffer. Value is
// meaningless for EOS buffers.
TrackId track_id() const { return track_id_; }
// Converts this buffer to a splice buffer. |pre_splice_buffers| must not
// have any EOS buffers, must not have any splice buffers, nor must have any
// buffer with preroll.
//
// |pre_splice_buffers| will be deep copied and each copy's splice_timestamp()
// will be set to this buffer's splice_timestamp(). A copy of |this|, with a
// splice_timestamp() of kNoTimestamp(), will be added to the end of
// |splice_buffers_|.
//
// See the Audio Splice Frame Algorithm in the MSE specification for details.
typedef StreamParser::BufferQueue BufferQueue;
void ConvertToSpliceBuffer(const BufferQueue& pre_splice_buffers);
const BufferQueue& splice_buffers() const { return splice_buffers_; }
// Specifies a buffer which must be decoded prior to this one to ensure this
// buffer can be accurately decoded. The given buffer must be of the same
// type, must not be a splice buffer, must not have any discard padding, and
// must not be an end of stream buffer. |preroll| is not copied.
//
// It's expected that this preroll buffer will be discarded entirely post
// decoding. As such it's discard_padding() will be set to kInfiniteDuration.
//
// All future timestamp, decode timestamp, config id, or track id changes to
// this buffer will be applied to the preroll buffer as well.
void SetPrerollBuffer(const scoped_refptr<StreamParserBuffer>& preroll);
const scoped_refptr<StreamParserBuffer>& preroll_buffer() {
return preroll_buffer_;
}
void set_timestamp(base::TimeDelta timestamp) override;
private:
StreamParserBuffer(const uint8* data, int data_size,
const uint8* side_data, int side_data_size,
bool is_keyframe, Type type,
TrackId track_id);
~StreamParserBuffer() override;
bool is_keyframe_;
DecodeTimestamp decode_timestamp_;
int config_id_;
Type type_;
TrackId track_id_;
BufferQueue splice_buffers_;
scoped_refptr<StreamParserBuffer> preroll_buffer_;
DISALLOW_COPY_AND_ASSIGN(StreamParserBuffer);
};
} // namespace media
#endif // MEDIA_BASE_STREAM_PARSER_BUFFER_H_
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