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 virtual ~EsParserH264(); 46 47 // EsParser implementation. 48 virtual void Flush() OVERRIDE; 49 50 private: 51 // EsParser implementation. 52 virtual bool ParseFromEsQueue() OVERRIDE; 53 virtual 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 90