106 lines
3.2 KiB
C++
106 lines
3.2 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MEDIA_FORMATS_MP2T_ES_PARSER_H264_H_
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#define MEDIA_FORMATS_MP2T_ES_PARSER_H264_H_
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#include <list>
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#include <utility>
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#include "base/basictypes.h"
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#include "base/callback.h"
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#include "base/compiler_specific.h"
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#include "base/memory/scoped_ptr.h"
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#include "media/formats/mp2t/es_parser.h"
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namespace media {
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class H264ByteToUnitStreamConverter;
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class H264Parser;
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class OffsetByteQueue;
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struct H264SPS;
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} // namespace media
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namespace media {
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namespace mp2t {
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// Remark:
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// In this h264 parser, frame splitting is based on AUD nals.
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// Mpeg2 TS spec: "2.14 Carriage of Rec. ITU-T H.264 | ISO/IEC 14496-10 video"
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// "Each AVC access unit shall contain an access unit delimiter NAL Unit;"
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//
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class EsParserH264 : public EsParser {
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public:
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EsParserH264(uint32 pid,
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const NewStreamInfoCB& new_stream_info_cb,
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const EmitSampleCB& emit_sample_cb);
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virtual ~EsParserH264();
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// EsParser implementation overrides.
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virtual bool Parse(const uint8* buf, int size, int64 pts, int64 dts) OVERRIDE;
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virtual void Flush() OVERRIDE;
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virtual void Reset() OVERRIDE;
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private:
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struct TimingDesc {
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int64 dts;
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int64 pts;
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};
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// Find the AUD located at or after |*stream_pos|.
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// Return true if an AUD is found.
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// If found, |*stream_pos| corresponds to the position of the AUD start code
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// in the stream. Otherwise, |*stream_pos| corresponds to the last position
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// of the start code parser.
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bool FindAUD(int64* stream_pos);
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// Resumes the H264 ES parsing.
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// Return true if successful.
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bool ParseInternal();
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// Emit a frame whose position in the ES queue starts at |access_unit_pos|.
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// Returns true if successful, false if no PTS is available for the frame.
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bool EmitFrame(int64 access_unit_pos, int access_unit_size,
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bool is_key_frame, int pps_id);
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// Update the video decoder config based on an H264 SPS.
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// Return true if successful.
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bool UpdateVideoDecoderConfig(const H264SPS* sps);
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// Callbacks to pass the stream configuration and the frames.
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NewStreamInfoCB new_stream_info_cb_;
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EmitSampleCB emit_sample_cb_;
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// Bytes of the ES stream that have not been emitted yet.
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scoped_ptr<media::OffsetByteQueue> es_queue_;
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std::list<std::pair<int64, TimingDesc> > timing_desc_list_;
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// H264 parser state.
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// - |current_access_unit_pos_| is pointing to an annexB syncword
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// representing the first NALU of an H264 access unit.
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scoped_ptr<H264Parser> h264_parser_;
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int64 current_access_unit_pos_;
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int64 next_access_unit_pos_;
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// Filter to convert H.264 Annex B byte stream to unit stream.
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scoped_ptr<H264ByteToUnitStreamConverter> stream_converter_;
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// Last video decoder config.
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scoped_refptr<StreamInfo> last_video_decoder_config_;
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bool decoder_config_check_pending_;
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// Frame for which we do not yet have a duration.
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scoped_refptr<MediaSample> pending_sample_;
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uint64 pending_sample_duration_;
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// Indicates whether waiting for first key frame.
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bool waiting_for_key_frame_;
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};
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} // namespace mp2t
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} // namespace media
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#endif
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