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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_H264_H_
#define MEDIA_FORMATS_MP2T_ES_PARSER_H264_H_
#include <list>
#include <utility>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/time/time.h"
#include "media/base/media_export.h"
#include "media/base/video_decoder_config.h"
#include "media/formats/mp2t/es_adapter_video.h"
#include "media/formats/mp2t/es_parser.h"
namespace media {
class H264Parser;
struct H264SPS;
class OffsetByteQueue;
}
namespace media {
namespace mp2t {
// Remark:
// In this h264 parser, frame splitting is based on AUD nals.
// Mpeg2 TS spec: "2.14 Carriage of Rec. ITU-T H.264 | ISO/IEC 14496-10 video"
// "Each AVC access unit shall contain an access unit delimiter NAL Unit;"
//
class MEDIA_EXPORT EsParserH264 : NON_EXPORTED_BASE(public EsParser) {
public:
typedef base::Callback<void(const VideoDecoderConfig&)> NewVideoConfigCB;
EsParserH264(const NewVideoConfigCB& new_video_config_cb,
const EmitBufferCB& emit_buffer_cb);
virtual ~EsParserH264();
// EsParser implementation.
virtual bool Parse(const uint8* buf, int size,
base::TimeDelta pts,
base::TimeDelta dts) OVERRIDE;
virtual void Flush() OVERRIDE;
virtual void Reset() OVERRIDE;
private:
struct TimingDesc {
base::TimeDelta dts;
base::TimeDelta pts;
};
// Find the AUD located at or after |*stream_pos|.
// Return true if an AUD is found.
// If found, |*stream_pos| corresponds to the position of the AUD start code
// in the stream. Otherwise, |*stream_pos| corresponds to the last position
// of the start code parser.
bool FindAUD(int64* stream_pos);
// Resumes the H264 ES parsing.
// Return true if successful.
bool ParseInternal();
// Emit a frame whose position in the ES queue starts at |access_unit_pos|.
// Returns true if successful, false if no PTS is available for the frame.
bool EmitFrame(int64 access_unit_pos, int access_unit_size,
bool is_key_frame, int pps_id);
// Update the video decoder config based on an H264 SPS.
// Return true if successful.
bool UpdateVideoDecoderConfig(const H264SPS* sps);
EsAdapterVideo es_adapter_;
// Bytes of the ES stream that have not been emitted yet.
scoped_ptr<media::OffsetByteQueue> es_queue_;
std::list<std::pair<int64, TimingDesc> > timing_desc_list_;
// H264 parser state.
// - |current_access_unit_pos_| is pointing to an annexB syncword
// representing the first NALU of an H264 access unit.
scoped_ptr<H264Parser> h264_parser_;
int64 current_access_unit_pos_;
int64 next_access_unit_pos_;
// Last video decoder config.
VideoDecoderConfig last_video_decoder_config_;
DISALLOW_COPY_AND_ASSIGN(EsParserH264);
};
} // namespace mp2t
} // namespace media
#endif
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