nal.h

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#pragma once
 
#include <stdbool.h>
#include <stdint.h>
 
#include <datatype99.h>
#include <slice99.h>
 
#include <smolrtsp/priv/compiler_attrs.h>
 
#if !defined(SMOLRTSP_WITH_H264) && !defined(SMOLRTSP_WITH_H265) &&            \
    !defined(SMOLRTSP_WITH_H266)
#error "smolrtsp: at least one NAL codec must be enabled at build time."
#endif
 
#ifdef SMOLRTSP_WITH_H264
#include <smolrtsp/nal/h264.h>
#endif
#ifdef SMOLRTSP_WITH_H265
#include <smolrtsp/nal/h265.h>
#endif
#ifdef SMOLRTSP_WITH_H266
#include <smolrtsp/nal/h266.h>
#endif
 
// clang-format off
// `datatype99` is variadic but its variant list cannot contain preprocessor
// directives, so the (up to 2**3 - 1 = 7) live combinations are enumerated.
#if defined(SMOLRTSP_WITH_H264) && defined(SMOLRTSP_WITH_H265) && defined(SMOLRTSP_WITH_H266)
datatype99(
    SmolRTSP_NalHeader,
    (SmolRTSP_NalHeader_H264, SmolRTSP_H264NalHeader),
    (SmolRTSP_NalHeader_H265, SmolRTSP_H265NalHeader),
    (SmolRTSP_NalHeader_H266, SmolRTSP_H266NalHeader)
);
#elif defined(SMOLRTSP_WITH_H264) && defined(SMOLRTSP_WITH_H265)
datatype99(
    SmolRTSP_NalHeader,
    (SmolRTSP_NalHeader_H264, SmolRTSP_H264NalHeader),
    (SmolRTSP_NalHeader_H265, SmolRTSP_H265NalHeader)
);
#elif defined(SMOLRTSP_WITH_H264) && defined(SMOLRTSP_WITH_H266)
datatype99(
    SmolRTSP_NalHeader,
    (SmolRTSP_NalHeader_H264, SmolRTSP_H264NalHeader),
    (SmolRTSP_NalHeader_H266, SmolRTSP_H266NalHeader)
);
#elif defined(SMOLRTSP_WITH_H265) && defined(SMOLRTSP_WITH_H266)
datatype99(
    SmolRTSP_NalHeader,
    (SmolRTSP_NalHeader_H265, SmolRTSP_H265NalHeader),
    (SmolRTSP_NalHeader_H266, SmolRTSP_H266NalHeader)
);
#elif defined(SMOLRTSP_WITH_H264)
datatype99(
    SmolRTSP_NalHeader,
    (SmolRTSP_NalHeader_H264, SmolRTSP_H264NalHeader)
);
#elif defined(SMOLRTSP_WITH_H265)
datatype99(
    SmolRTSP_NalHeader,
    (SmolRTSP_NalHeader_H265, SmolRTSP_H265NalHeader)
);
#elif defined(SMOLRTSP_WITH_H266)
datatype99(
    SmolRTSP_NalHeader,
    (SmolRTSP_NalHeader_H266, SmolRTSP_H266NalHeader)
);
#endif
// clang-format on
 
uint8_t
SmolRTSP_NalHeader_unit_type(SmolRTSP_NalHeader self) SMOLRTSP_PRIV_MUST_USE;
 
size_t SmolRTSP_NalHeader_size(SmolRTSP_NalHeader self) SMOLRTSP_PRIV_MUST_USE;
 
size_t
SmolRTSP_NalHeader_fu_size(SmolRTSP_NalHeader self) SMOLRTSP_PRIV_MUST_USE;
 
bool SmolRTSP_NalHeader_is_vps(SmolRTSP_NalHeader self) SMOLRTSP_PRIV_MUST_USE;
 
bool SmolRTSP_NalHeader_is_sps(SmolRTSP_NalHeader self) SMOLRTSP_PRIV_MUST_USE;
 
bool SmolRTSP_NalHeader_is_pps(SmolRTSP_NalHeader self) SMOLRTSP_PRIV_MUST_USE;
 
bool SmolRTSP_NalHeader_is_coded_slice_idr(SmolRTSP_NalHeader self)
    SMOLRTSP_PRIV_MUST_USE;
 
bool SmolRTSP_NalHeader_is_coded_slice_non_idr(SmolRTSP_NalHeader self)
    SMOLRTSP_PRIV_MUST_USE;
 
void SmolRTSP_NalHeader_serialize(
    SmolRTSP_NalHeader self, uint8_t buffer[restrict]);
 
void SmolRTSP_NalHeader_write_fu_header(
    SmolRTSP_NalHeader self, uint8_t buffer[restrict], bool is_first_fragment,
    bool is_last_fragment);
 
typedef struct {
    SmolRTSP_NalHeader header;
 
    U8Slice99 payload;
} SmolRTSP_NalUnit;
 
uint8_t smolrtsp_nal_fu_header(
    bool is_first_fragment, bool is_last_fragment,
    uint8_t unit_type) SMOLRTSP_PRIV_MUST_USE;
 
typedef size_t (*SmolRTSP_NalStartCodeTester)(U8Slice99 data);
 
SmolRTSP_NalStartCodeTester
smolrtsp_determine_start_code(U8Slice99 data) SMOLRTSP_PRIV_MUST_USE;
 
size_t smolrtsp_test_start_code_3b(U8Slice99 data);
 
size_t smolrtsp_test_start_code_4b(U8Slice99 data);