media/formats/mp2t/es_parser_h264.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_FORMATS_MP2T_ES_PARSER_H264_H_
   6 #define MEDIA_FORMATS_MP2T_ES_PARSER_H264_H_
   7
   8 #include <list>
   9 #include <utility>
  10
  11 #include "base/basictypes.h"
  12 #include "base/callback.h"
  13 #include "base/compiler_specific.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/time/time.h"
  16 #include "media/base/media_export.h"
  17 #include "media/base/video_decoder_config.h"
  18 #include "media/formats/mp2t/es_adapter_video.h"
  19 #include "media/formats/mp2t/es_parser.h"
  20
  21 namespace media {
  22 class H264Parser;
  23 struct H264SPS;
  24 class OffsetByteQueue;
  25 }
  26
  27 namespace media {
  28 namespace mp2t {
  29
  30 // A few remarks:
  31 // - In this h264 parser, frame splitting is based on AUD nals.
  32 // Mpeg2 TS spec: "2.14 Carriage of Rec. ITU-T H.264 | ISO/IEC 14496-10 video"
  33 // "Each AVC access unit shall contain an access unit delimiter NAL Unit;"
  34 // - PES packets do not necessarily map to an H264 access unit although the HLS
  35 // recommendation is to use one PES for each access unit. In this parser,
  36 // we handle the general case and do not make any assumption about the access
  37 // unit organization within PES packets.
  38 //
  39 class MEDIA_EXPORT EsParserH264 : public EsParser {
  40  public:
  41   typedef base::Callback<void(const VideoDecoderConfig&)> NewVideoConfigCB;
  42
  43   EsParserH264(const NewVideoConfigCB& new_video_config_cb,
  44                const EmitBufferCB& emit_buffer_cb);
  45   ~EsParserH264() override;
  46
  47   // EsParser implementation.
  48   void Flush() override;
  49
  50  private:
  51   // EsParser implementation.
  52   bool ParseFromEsQueue() override;
  53   void ResetInternal() override;
  54
  55   // Find the AUD located at or after |*stream_pos|.
  56   // Return true if an AUD is found.
  57   // If found, |*stream_pos| corresponds to the position of the AUD start code
  58   // in the stream. Otherwise, |*stream_pos| corresponds to the last position
  59   // of the start code parser.
  60   bool FindAUD(int64* stream_pos);
  61
  62   // Emit a frame whose position in the ES queue starts at |access_unit_pos|.
  63   // Returns true if successful, false if no PTS is available for the frame.
  64   bool EmitFrame(int64 access_unit_pos, int access_unit_size,
  65                  bool is_key_frame, int pps_id);
  66
  67   // Update the video decoder config based on an H264 SPS.
  68   // Return true if successful.
  69   bool UpdateVideoDecoderConfig(const H264SPS* sps);
  70
  71   EsAdapterVideo es_adapter_;
  72
  73   // H264 parser state.
  74   // - |current_access_unit_pos_| is pointing to an annexB syncword
  75   // representing the first NALU of an H264 access unit.
  76   scoped_ptr<H264Parser> h264_parser_;
  77   int64 current_access_unit_pos_;
  78   int64 next_access_unit_pos_;
  79
  80   // Last video decoder config.
  81   VideoDecoderConfig last_video_decoder_config_;
  82
  83   DISALLOW_COPY_AND_ASSIGN(EsParserH264);
  84 };
  85
  86 }  // namespace mp2t
  87 }  // namespace media
  88
  89 #endif