| // 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 COBALT_MEDIA_FORMATS_MP2T_ES_PARSER_H_ |
| #define COBALT_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 OffsetByteQueue; |
| class StreamParserBuffer; |
| |
| namespace mp2t { |
| |
| class MEDIA_EXPORT EsParser { |
| public: |
| typedef base::Callback<void(scoped_refptr<StreamParserBuffer>)> EmitBufferCB; |
| |
| 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 // COBALT_MEDIA_FORMATS_MP2T_ES_PARSER_H_ |