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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.
#ifndef MEDIA_FORMATS_MP2T_ES_PARSER_H_
#define MEDIA_FORMATS_MP2T_ES_PARSER_H_
#include <stdint.h>
#include <list>
#include <memory>
#include <utility>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
#include "media/base/media_export.h"
#include "media/base/stream_parser_buffer.h"
namespace media {
class DecryptConfig;
class OffsetByteQueue;
class StreamParserBuffer;
namespace mp2t {
class MEDIA_EXPORT EsParser {
public:
using EmitBufferCB =
base::RepeatingCallback<void(scoped_refptr<StreamParserBuffer>)>;
using GetDecryptConfigCB = base::RepeatingCallback<const DecryptConfig*()>;
EsParser();
virtual ~EsParser();
// ES parsing.
// Should use kNoTimestamp when a timestamp is not valid.
bool Parse(const uint8_t* buf,
int size,
base::TimeDelta pts,
DecodeTimestamp dts);
// Flush any pending buffer.
virtual void Flush() = 0;
// Reset the state of the ES parser.
void Reset();
protected:
struct TimingDesc {
TimingDesc();
TimingDesc(DecodeTimestamp dts, base::TimeDelta pts);
DecodeTimestamp dts;
base::TimeDelta pts;
};
// Parse ES data from |es_queue_|.
// Return true when successful.
virtual bool ParseFromEsQueue() = 0;
// Reset the internal state of the ES parser.
virtual void ResetInternal() = 0;
// Get the timing descriptor with the largest byte count that is less or
// equal to |es_byte_count|.
// This timing descriptor and all the ones that come before (in stream order)
// are removed from list |timing_desc_list_|.
// If no timing descriptor is found, then the default TimingDesc is returned.
TimingDesc GetTimingDescriptor(int64_t es_byte_count);
// Bytes of the ES stream that have not been emitted yet.
std::unique_ptr<media::OffsetByteQueue> es_queue_;
private:
// Anchor some timing information into the ES queue.
// Here are two examples how this timing info is applied according to
// the MPEG-2 TS spec - ISO/IEC 13818:
// - "In the case of audio, if a PTS is present in PES packet header it shall
// refer to the first access unit commencing in the PES packet. An audio
// access unit commences in a PES packet if the first byte of the audio
// access unit is present in the PES packet."
// - "For AVC video streams conforming to one or more profiles defined
// in Annex A of Rec. ITU-T H.264 | ISO/IEC 14496-10 video, if a PTS is
// present in the PES packet header, it shall refer to the first AVC access
// unit that commences in this PES packet.
std::list<std::pair<int64_t, TimingDesc>> timing_desc_list_;
DISALLOW_COPY_AND_ASSIGN(EsParser);
};
} // namespace mp2t
} // namespace media
#endif // MEDIA_FORMATS_MP2T_ES_PARSER_H_