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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 <stdint.h>
#include <memory>
#include <utility>
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "media/base/media_export.h"
#include "media/base/ranges.h"
#include "media/base/video_decoder_config.h"
#include "media/formats/mp2t/es_adapter_video.h"
#include "media/formats/mp2t/es_parser.h"
#include "media/media_buildflags.h"
namespace media {
class H264Parser;
struct H264SPS;
}
namespace media {
namespace mp2t {
// A few remarks:
// - 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;"
// - PES packets do not necessarily map to an H264 access unit although the HLS
// recommendation is to use one PES for each access unit. In this parser,
// we handle the general case and do not make any assumption about the access
// unit organization within PES packets.
//
class MEDIA_EXPORT EsParserH264 : public EsParser {
public:
using NewVideoConfigCB =
base::RepeatingCallback<void(const VideoDecoderConfig&)>;
EsParserH264(NewVideoConfigCB new_video_config_cb,
EmitBufferCB emit_buffer_cb);
#if BUILDFLAG(ENABLE_HLS_SAMPLE_AES)
EsParserH264(NewVideoConfigCB new_video_config_cb,
EmitBufferCB emit_buffer_cb,
EncryptionScheme init_encryption_scheme,
const GetDecryptConfigCB& get_decrypt_config_cb);
#endif
~EsParserH264() override;
// EsParser implementation.
void Flush() override;
private:
// EsParser implementation.
bool ParseFromEsQueue() override;
void ResetInternal() override;
// 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_t* stream_pos);
// 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_t 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, EncryptionScheme scheme);
EsAdapterVideo es_adapter_;
// H264 parser state.
// - |current_access_unit_pos_| is pointing to an annexB syncword
// representing the first NALU of an H264 access unit.
std::unique_ptr<H264Parser> h264_parser_;
int64_t current_access_unit_pos_;
int64_t next_access_unit_pos_;
#if BUILDFLAG(ENABLE_HLS_SAMPLE_AES)
const EncryptionScheme init_encryption_scheme_;
// Callback to obtain the current decrypt_config.
GetDecryptConfigCB get_decrypt_config_cb_;
Ranges<int> protected_blocks_;
#endif
// Last video decoder config.
VideoDecoderConfig last_video_decoder_config_;
DISALLOW_COPY_AND_ASSIGN(EsParserH264);
};
} // namespace mp2t
} // namespace media
#endif // MEDIA_FORMATS_MP2T_ES_PARSER_H264_H_