mpegdescriptors.h

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// -*- Mode: c++ -*-
// Copyright (c) 2003-2004, Daniel Thor Kristjansson
#ifndef MPEG_DESCRIPTORS_H
#define MPEG_DESCRIPTORS_H
 
// C++ headers
#include <array>
#include <vector>
 
// Qt headers
#include <QMutex>
#include <QString>
 
// MythTV
#include "libmythbase/iso639.h"
#include "libmythtv/mythtvexp.h"
 
using desc_list_t = std::vector<const unsigned char *>;
 
class DescriptorID
{
  public:
    enum : std::uint8_t
    {
        // MPEG
        video_stream                = 0x02,
        audio_stream                = 0x03,
        hierarchy                   = 0x04,
        registration                = 0x05, /* implemented */
        data_stream_alignment       = 0x06,
        target_background_grid      = 0x07,
        video_window                = 0x08,
        conditional_access          = 0x09, /* implemented */
        iso_639_language            = 0x0A, /* implemented */
        system_clock                = 0x0B, /* implemented */
        multiplex_buffer_utilization= 0x0C,
        copyright                   = 0x0D,
        maximum_bitrate             = 0x0E, /* implemented */
        private_data_indicator      = 0x0F,
        smoothing_buffer            = 0x10,
        std                         = 0x11,
        ibp                         = 0x12,
        carousel_identifier         = 0x13,
        association_tag             = 0x14,
        deferred_association_tag    = 0x15,
        /*  RESERVED                = 0x16, */
        npt_reference               = 0x17,
        npt_endpoint                = 0x18,
        stream_mode                 = 0x19,
        stream_event                = 0x1A,
        mpeg4_video                 = 0x1B,
        mpeg4_audio                 = 0x1C,
        iod                         = 0x1D,
        sl                          = 0x1E,
        fmc                         = 0x1F,
        external_es_id              = 0x20,
        mux_code                    = 0x21,
        fmx_buffer_size             = 0x22,
        multiplex_buffer            = 0x23,
        content_labeling            = 0x24,
        metadata_pointer            = 0x25,
        metadata                    = 0x26,
        metadata_std                = 0x27,
        avc_video                   = 0x28, /* implemented */
        ipmp                        = 0x29,
        avc_timing_and_hrd          = 0x2A, /* partial */
        mpeg2_aac_audio             = 0x2B,
        flex_mux_timing             = 0x2C,
        hevc_video                  = 0x38,
 
        // DVB Bluebook A038 (Feb 2019) p 36-38, Table 12
        network_name                = 0x40, /* implemented */
        service_list                = 0x41, /* implemented */
        dvb_stuffing                = 0x42, /* implemented */
        satellite_delivery_system   = 0x43, /* implemented */
        cable_delivery_system       = 0x44, /* implemented */
        vbi_data                    = 0x45, /* partial */
        vbi_teletext                = 0x46, /* partial */
        bouquet_name                = 0x47, /* implemented */
        service                     = 0x48, /* implemented, toString lacking */
        country_availability        = 0x49, /* implemented */
        linkage                     = 0x4A, /* partial */
        nvod_reference              = 0x4B, /* partial */
        dvb_time_shifted_service    = 0x4C, /* partial */
        short_event                 = 0x4D, /* implemented */
        extended_event              = 0x4E, /* implemented */
        time_shifted_event          = 0x4F, /* partial */
 
        component                   = 0x50, /* implemented, toString lacking */
        mosaic                      = 0x51, /* partial */
        stream_identifier           = 0x52, /* implemented */
        ca_identifier               = 0x53, /* partial */
        content                     = 0x54, /* implemented */
        parental_rating             = 0x55, /* partial */
        teletext                    = 0x56, /* partial */
        telephone                   = 0x57, /* partial */
        local_time_offset           = 0x58,
        subtitling                  = 0x59, /* partial */
        terrestrial_delivery_system = 0x5A, /* implemented */
        multilingual_network_name   = 0x5B, /* partial */
        multilingual_bouquet_name   = 0x5C, /* partial */
        multilingual_service_name   = 0x5D, /* partial */
        multilingual_component      = 0x5E,
        private_data_specifier      = 0x5F, /* partial */
 
        service_move                = 0x60, /* partial */
        short_smoothing_buffer      = 0x61, /* partial */
        frequency_list              = 0x62, /* implemented */
        partial_transport_stream    = 0x63, /* partial */
        data_broadcast              = 0x64, /* partial */
        scrambling                  = 0x65, /* partial */
        data_broadcast_id           = 0x66, /* partial */
        transport_stream            = 0x67, /* partial */
        dsng                        = 0x68, /* partial */
        pdc                         = 0x69, /* partial */
        ac3                         = 0x6A, /* partial */
        ancillary_data              = 0x6B, /* partial */
        cell_list                   = 0x6C, /* partial */
        cell_frequency_link         = 0x6D, /* partial */
        announcement_support        = 0x6E, /* partial */
        application_signalling      = 0x6F,
 
        adaptation_field_data          = 0x70, /* partial */
        service_identifier             = 0x71,
        service_availability           = 0x72, /* partial */
        default_authority              = 0x73, /* implemented */
        related_content                = 0x74,
        tva_id                         = 0x75,
        dvb_content_identifier         = 0x76, /* partial */
        time_slice_fec_identifier      = 0x77,
        ecm_repetition_rate            = 0x78,
        s2_satellite_delivery_system   = 0x79, /* partial */
        eac3                           = 0x7A,
        dts                            = 0x7B,
        aac                            = 0x7C,
        xait_location                  = 0x7D,
        fta_content_management         = 0x7E,
        extension                      = 0x7F,
 
        // DVB Bluebook A038 (Feb 2019) p 94, Table 109
        //
        // Extension descriptors
        image_icon                     = 0x00,
        t2_delivery_system             = 0x04,
        sh_delivery_system             = 0x05,
        supplementary_audio            = 0x06,
        network_change_notify          = 0x07,
        message                        = 0x08,
        target_region                  = 0x09,
        target_region_name             = 0x0A,
        service_relocated              = 0x0B,
        xait_pid                       = 0x0C,
        c2_delivery_system             = 0x0D,
        uri_linkage                    = 0x13,
        ci_ancillary_data              = 0x14,
        c2_bundle_delivery_system      = 0x16,
        s2x_satellite_delivery_system  = 0x17,
 
        // ATSC
        atsc_stuffing               = 0x80,
        ac3_audio_stream            = 0x81, /* partial */
        atsc_program_identifier     = 0x85,
        caption_service             = 0x86, /* implemented */
        content_advisory            = 0x87,
        atsc_ca_descriptor          = 0x88,
        atsc_descriptor_tag         = 0x89,
 
        // SCTE
        scte_frame_rate             = 0x82, /* implemented, also ATSC */
        scte_extended_video         = 0x83, /* implemented, also ATSC */
        scte_component_name         = 0x84, /* implemented, also ATSC */
        scte_cue_identifier         = 0x8A, /* implemented */
        scte_frequency_spec         = 0x90, /* implemented */
        scte_modulation_params      = 0x91, /* implemented */
        scte_transport_stream_id    = 0x92, /* implemented */
        scte_revision_detection     = 0x93, /* implemented */
 
        // ATSC
        extended_channel_name       = 0xA0, /* implemented */
        service_location            = 0xA1,
        atsc_time_shifted_service   = 0xA2,
        component_name              = 0xA3, /* implemented */
        atsc_data_service           = 0xA4,
        atsc_pid_count              = 0xA5,
        atsc_download               = 0xA6,
        multiprotocol_encapsulation = 0xA7,
        dcc_departing_request       = 0xA8,
        dcc_arriving_request        = 0xA9,
        drm_control                 = 0xAA,
        atsc_genre                  = 0xAB,
        atsc_private_information    = 0xAD,
 
        atsc_content_identifier     = 0xB6, /* partial */
    };
};
 
class PrivateDescriptorID
{
  public:
    enum : std::uint8_t
    {
        // These can conflict and should only be used
        // on these specific networks.
 
        // Private -- UK and NL
        dvb_logical_channel_descriptor = 0x83, /* implemented */
        dvb_simulcast_channel_descriptor = 0x88, /* implemented */
 
        // Private -- NL Casema
        casema_video_on_demand         = 0x87,
        ziggo_package_descriptor       = 0xd4,
 
        // Private -- Dish Network
        dish_event_rights              = 0x87,
        dish_event_mpaa                = 0x89, /* implemented */
        dish_event_name                = 0x91, /* implemented */
        dish_event_description         = 0x92, /* implemented */
        dish_event_properties          = 0x94, /* implemented */
        dish_event_vchip               = 0x95, /* implemented */
        dish_event_tags                = 0x96, /* implemented */
 
        // Private -- SES
        nordig_content_protection      = 0xA0,
 
        // Private -- CH UPC Cablecom
        upc_event_episode_title        = 0xA7,
 
        // Private -- Sky Astra-2 28.2E and other Sky satellites
        sky_lcn_table                  = 0xb1,  /* implemented */
 
        // Private -- FreeSat Astra-2 28.2E
        freesat_lcn_table              = 0xd3,  /* implemented */
        freesat_region_table           = 0xd4,  /* implemented */
        freesat_chan_cat_mapping       = 0xd5,  /* todo */
        freesat_d6_table               = 0xd6,  /* unknown */
        freesat_d7_table               = 0xd7,  /* unknown */
        freesat_category_table         = 0xd8,  /* todo */
        freesat_callsign               = 0xd9,  /* partial */
 
        // Private -- premiere.de
        premiere_content_order         = 0xF0,
        premiere_parental_information  = 0xF1,
        premiere_content_transmission  = 0xF2,
 
        // Private -- OpenTV
        opentv_titles_1                = 0xA0,
        opentv_titles_2                = 0xA1,
        opentv_titles_3                = 0xA2,
        opentv_titles_4                = 0xA3,
        opentv_summaries_1             = 0xA8,
        opentv_summaries_2             = 0xA9,
        opentv_summaries_3             = 0xAA,
        opentv_summaries_4             = 0xAB,
        opentv_channel_list            = 0xB1, /* sky_lcn_table */
 
        // Private -- CI Plus LPP
        ci_protection_descriptor       = 0xce,
    };
};
 
/*
 * Private_Data_Specifier_ID from http://www.dvbservices.com/identifiers/private_data_spec_id
 */
class PrivateDataSpecifierID
{
  public:
    enum
    {
        SES    = 0x00000001,    // Société Européenne des Satellites
        BSB1   = 0x00000002,    // UK Sky (Astra 28.2E), Sky New Zealand (Optus D1 160E0)
        CASEMA = 0x00000016,    // NL Casema
        EACEM  = 0x00000028,    // NL Ziggo
        NORDIG = 0x00000029,    // EU Nordig
        CIPLUS = 0x00000040,    // CI Plus LPP
        ORS    = 0x000001B0,    // ORS comm GmbH & Co KG
        UPC1   = 0x00000600,    // UPC Cablecom
        ITC    = 0x0000233A,    // Independent Television Commission
        IRDETO = 0x00362275,    // Irdeto
        FSAT   = 0x46534154,    // UK BBC FreeSat on Astra 28.2E
        OTV    = 0x4f545600,    // OpenTV
    };
};
 
/*
 * Original_Network_ID from http://www.dvbservices.com/identifiers/original_network_id
 */
class OriginalNetworkID
{
  public:
    enum : std::uint16_t
    {
        SES2     = 0x0002,      // Société Européenne des Satellites
        BBC      = 0x003B,      // BBC / Freesat
        TELENOR  = 0x0046,      // Telenor Norway
        PREMIERE = 0x0085,      // Sky Deutschland Fernsehen GmbH & Co. KG
        SKYNZ    = 0x00A9,      // Sky New Zealand / Sky Network Television Ltd (NDS)
        MCA      = 0x1800,      // Not defined in DVB-SI Original Network ID tables
        NOZEMA   = 0x2210,      // Netherlands Digital Terrestrial Television
    };
};
 
class MTV_PUBLIC MPEGDescriptor
{
  public:
    operator const unsigned char*() const { return m_data; }
 
    explicit MPEGDescriptor(const unsigned char *data, int len = 300) : m_data(data)
    {
        if ((len < 2) || (int(DescriptorLength()) + 2) > len)
            m_data = nullptr;
    }
    explicit MPEGDescriptor(const std::vector<uint8_t> &data) : m_data(data.data())
    {
        if ((data.size() < 2) ||
            ((static_cast<size_t>(DescriptorLength()) + 2) > data.size()))
            m_data = nullptr;
    }
    MPEGDescriptor(const unsigned char *data,
                   int len, uint tag) : m_data(data)
    {
        if ((len < 2) || ((int(DescriptorLength()) + 2) > len)
            || (DescriptorTag() != tag))
            m_data = nullptr;
    }
    MPEGDescriptor(const std::vector<uint8_t> &data, uint tag) : m_data(data.data())
    {
        if ((data.size() < 2) ||
            ((static_cast<size_t>(DescriptorLength()) + 2) > data.size())
            || (DescriptorTag() != tag))
            m_data = nullptr;
    }
    MPEGDescriptor(const unsigned char *data,
                   int len, uint tag, uint req_desc_len) : m_data(data)
    {
        if ((len < 2) || ((int(DescriptorLength()) + 2) > len)
            || (DescriptorTag() != tag)
            || (DescriptorLength() != req_desc_len))
            m_data = nullptr;
    }
    virtual ~MPEGDescriptor() = default;
 
    bool IsValid(void) const { return m_data; }
    uint size(void) const { return DescriptorLength() + 2; }
 
    uint DescriptorTag(void) const { return m_data[0]; }
    uint DescriptorLength(void) const { return m_data[1]; }
    uint DescriptorTagExtension(void) const { return m_data[2]; }
    QString DescriptorTagString(void) const;
 
    virtual QString toString(void) const;
    virtual QString toStringPD(uint priv_dsid) const;
    virtual QString toStringXML(uint indent_level) const;
    
    static desc_list_t Parse(const unsigned char *data, uint len);
    static desc_list_t ParseAndExclude(const unsigned char *data, uint len,
                                       int excluded_descid);
    static desc_list_t ParseOnlyInclude(const unsigned char *data, uint len,
                                        int excluded_descid);
 
    static const unsigned char *Find(const desc_list_t &parsed, uint desc_tag);
    static const unsigned char *FindExtension(const desc_list_t &parsed, uint desc_tag);
    static desc_list_t FindAll(const desc_list_t &parsed, uint desc_tag);
 
    static const unsigned char *FindBestMatch(
        const desc_list_t &parsed, uint desc_tag, QMap<uint,uint> &langPref);
    static desc_list_t FindBestMatches(
        const desc_list_t &parsed, uint desc_tag, QMap<uint,uint> &langPref);
 
  protected:
    const unsigned char *m_data;
 
  public:
    QString hexdump(void) const;
    QString descrDump(const QString &name) const;
};
 
// ISO 13181-1:2019 page 75
class VideoStreamDescriptor : public MPEGDescriptor
{
  public:
    explicit VideoStreamDescriptor(const unsigned char *data, int len = 300) :
        MPEGDescriptor(data, len, DescriptorID::video_stream) { }
    //       Name             bits  loc  expected value
    // descriptor_tag           8   0.0       0x02
    // descriptor_length        8   1.0
    // multiple_frame_rate_flag 1   2.0
    bool MultipleFrameRateFlag(void) const { return (m_data[2] & 0x80) != 0; }
    // frame_rate_code          4   2.1
    uint FrameRateCode(void) const { return (m_data[2]>>3) & 0x0F; }
    // MPEG_1_only_flag         1   2.5
    bool MPEG1OnlyFlag(void) const { return (m_data[2] & 0x04) != 0; }
    // constrained_parameterflag 1   2.6
    bool ConstrainedParameterFlag(void) const { return (m_data[2] & 0x02) != 0; }
    // still_picture_flag        1   2.7
    bool StillPictureFlag(void) const { return (m_data[2] & 0x01) != 0; }
    // profile_and_level_indication 8   3.0
    uint ProfileAndLevelIndication(void) const { return MPEG1OnlyFlag() ? 0 : m_data[3]; }
    // chroma_format                2   4.0
    uint ChromaFormat(void) const { return MPEG1OnlyFlag() ? 0 : (m_data[4] >> 6) & 0x03; }
    // frame_rate_extension_flag    1   4.2
    bool FrameRateExtensionFlag(void) const { return MPEG1OnlyFlag() ? false : (m_data[4] & 0x20) != 0; }
 
    QString toString() const override; // MPEGDescriptor
};
 
// ISO 13181-1:2019 page 77
class AudioStreamDescriptor : public MPEGDescriptor
{
  public:
    explicit AudioStreamDescriptor(const unsigned char *data, int len = 300) :
        MPEGDescriptor(data, len, DescriptorID::audio_stream) { }
    //       Name             bits  loc  expected value
    // descriptor_tag           8   0.0       0x03
    // descriptor_length        8   1.0
    // free_format_flag         1   2.0
    bool FreeFormatFlag(void) const { return (m_data[2] & 0x80) != 0; }
    // ID                       1   2.1
    bool ID(void) const { return (m_data[2] & 0x40) != 0; }
    // layer                    2   2.2
    uint Layer(void) const { return (m_data[2] >> 4) & 0x03; }
    // variable_rate_audio_indicator 1   2.4
    bool VariableRateAudioIndicator(void) const { return (m_data[2] & 0x08) != 0; }
    // reserved                      3   2.5
 
    QString toString() const override; // MPEGDescriptor
};
 
// a_52a.pdf p119, Table A1
class RegistrationDescriptor : public MPEGDescriptor
{
  public:
    explicit RegistrationDescriptor(const unsigned char *data, int len = 300) :
        MPEGDescriptor(data, len, DescriptorID::registration)
    {
        // The HD-PVR outputs a registration descriptor with a length
        // of 8 rather than 4, so we accept any length >= 4, not just 4.
        if (IsValid() && DescriptorLength() < 4)
            m_data = nullptr;
    }
 
    uint FormatIdentifier(void) const
        { return (m_data[2]<<24) | (m_data[3]<<16) | (m_data[4]<<8) | m_data[5]; }
    QString FormatIdentifierString(void) const
    {
        return QString("") + QChar(m_data[2]) + QChar(m_data[3]) +
            QChar(m_data[4]) + QChar(m_data[5]);
    }
    QString toString() const override; // MPEGDescriptor
 
  private:
    static void InitializeDescriptionMap(void);
    static QString GetDescription(const QString &fmt);
 
  private:
    static QMutex                description_map_lock;
    static bool                  description_map_initialized;
    static QMap<QString,QString> description_map;
};
 
// ISO 13181-1:2019 page 79
class DataStreamAlignmentDescriptor : public MPEGDescriptor
{
  public:
    explicit DataStreamAlignmentDescriptor(const unsigned char *data, int len = 300) :
        MPEGDescriptor(data, len, DescriptorID::data_stream_alignment) { }
    //       Name             bits  loc  expected value
    // descriptor_tag           8   0.0       0x06
    // descriptor_length        8   1.0
    // alignment_type           2   2.0
    uint AlignmentType(void) const { return m_data[2]; }
 
    QString toString() const override; // MPEGDescriptor
};
 
class ConditionalAccessDescriptor : public MPEGDescriptor
{
  public:
    explicit ConditionalAccessDescriptor(const unsigned char *data, int len = 300) :
        MPEGDescriptor(data, len, DescriptorID::conditional_access) { }
 
    uint SystemID(void) const { return  m_data[2] << 8 | m_data[3]; }
    uint PID(void) const      { return (m_data[4] & 0x1F) << 8 | m_data[5]; }
    uint DataSize(void) const { return DescriptorLength() - 4; }
    const unsigned char *Data(void) const { return &m_data[6]; }
    QString toString() const override; // MPEGDescriptor
};
 
class ISO639LanguageDescriptor : public MPEGDescriptor
{
  public:
    explicit ISO639LanguageDescriptor(const unsigned char *data, int len = 300) :
        MPEGDescriptor(data, len, DescriptorID::iso_639_language) { }
 
    const unsigned char* CodeRaw() const { return &m_data[2]; }
    uint AudioType() const { return m_data[5]; }
 
    int LanguageKey(void) const
        { return iso639_str3_to_key(&m_data[2]); }
    QString LanguageString(void) const
        { return iso639_key_to_str3(LanguageKey()); }
    int CanonicalLanguageKey(void) const
        { return iso639_key_to_canonical_key(LanguageKey()); }
    QString CanonicalLanguageString(void) const
        { return iso639_key_to_str3(CanonicalLanguageKey()); }
    
    QString toString() const override; // MPEGDescriptor
};
 
// ISO 13181-1:2019 page 84
class SystemClockDescriptor : public MPEGDescriptor
{
  public:
    explicit SystemClockDescriptor(const unsigned char *data, int len = 300) :
        MPEGDescriptor(data, len, DescriptorID::system_clock) { }
    //       Name             bits  loc  expected value
    // descriptor_tag           8   0.0       0x0B
    // descriptor_length        8   1.0
    // external_clock_reference_indicator   2   2.0
    bool ExternalClockReferenceIndicator(void) const { return ( m_data[2]&0x80 ) != 0; }
    // reserved                 1   2.1
    // clock_accuracy_integer   6   2.2
    uint ClockAccuracyInteger(void) const { return m_data[2]&0x3F; }
    // clock_accuracy_exponent  3   3.0
    uint ClockAccuracyExponent(void) const { return m_data[3]>>5; }
    // reserved                 5   3.3
 
    QString toString() const override; // MPEGDescriptor
};
 
// ISO 13181-1:2019 page 86
class MaximumBitrateDescriptor : public MPEGDescriptor
{
  public:
    explicit MaximumBitrateDescriptor(const unsigned char *data, int len = 300) :
        MPEGDescriptor(data, len, DescriptorID::maximum_bitrate) { }
    //       Name             bits  loc  expected value
    // descriptor_tag           8   0.0       0x0E
    // descriptor_length        8   1.0       0x03
    // reserved                 2   2.0
    // maximum_bitrate         22   2.2
    uint MaximumBitrate(void) const
        { return (m_data[2] & 0x3f) << 16 | m_data[3]<<8 | m_data[4]; }
    QString toString() const override; // MPEGDescriptor
};
 
// ISO/IEC 13818-1:2019 (E) p87
class SmoothingBufferDescriptor : public MPEGDescriptor
{
  public:
    explicit SmoothingBufferDescriptor(const unsigned char *data, int len = 300) :
        MPEGDescriptor(data, len, DescriptorID::smoothing_buffer) { }
    //       Name             bits  loc  expected value
    // descriptor_tag           8   0.0       0x10
    // descriptor_length        8   1.0       0x06
 
    // reserved                 2   2.0
    // sb_leak_rate            22   2.2
    uint SBLeakRate(void) const
        { return (m_data[2] & 0x3f) << 16 | m_data[3]<<8 | m_data[4]; }
    // reserved                 2   5.0
    // sb_size                  2   5.2
    uint SBSize(void) const
        { return (m_data[5] & 0x3f) << 16 | m_data[6]<<8 | m_data[7]; }
    QString toString(void) const override; // MPEGDescriptor
};
 
class AVCVideoDescriptor : public MPEGDescriptor
{
  public:
    explicit AVCVideoDescriptor(const unsigned char *data, int len = 300) :
        MPEGDescriptor(data, len, DescriptorID::avc_video) { }
    //       Name             bits  loc  expected value
    // descriptor_tag           8   0.0       0x28
    // descriptor_length        8   1.0
    // profile_idc              8   2.0
    uint ProfileIDC(void)         const { return m_data[2]; }
    // constraint_set0_flag     1   3.0
    bool ConstraintSet0(void)     const { return ( m_data[3]&0x80 ) != 0; }
    // constraint_set1_flag     1   3.1
    bool ConstraintSet1(void)     const { return ( m_data[3]&0x40 ) != 0; }
    // constraint_set2_flag     1   3.2
    bool ConstraintSet2(void)     const { return ( m_data[3]&0x20 ) != 0; }
    // AVC_compatible_flags     5   3.3
    uint AVCCompatible(void)      const { return m_data[3]&0x1f; }
    // level_idc                8   4.0
    uint LevelIDC(void)           const { return m_data[4]; }
    // AVC_still_present        1   5.0
    bool AVCStill(void)           const { return ( m_data[5]&0x80 ) != 0; }
    // AVC_24_hour_picture_flag 1   5.1
    bool AVC24HourPicture(void)   const { return ( m_data[5]&0x40 ) != 0; }
    bool FramePackingSEINotPresentFlag(void)
                                  const { return ( m_data[5]&0x20 ) != 0; }
    // reserved 6 bslbf
    QString toString() const override; // MPEGDescriptor
};
 
class AVCTimingAndHRDDescriptor : public MPEGDescriptor
{
  public:
    explicit AVCTimingAndHRDDescriptor(const unsigned char *data, int len = 300) :
        MPEGDescriptor(data, len, DescriptorID::avc_timing_and_hrd) { }
    //       Name             bits  loc  expected value
    // descriptor_tag           8   0.0       0x
    // descriptor_length        8   1.0
    // hrd_management_valid     1   2.0
    bool HRDManagementValid(void)      const { return ( m_data[2]&0x80 ) != 0; }
    // reserved                 6   2.1
    // picture_and_timing_info_present 1 2.7
    bool HasPictureAndTimingInfo(void) const { return (m_data[2]&0x01) != 0;}
    // if (picture_and_timing_info_present) {
    //   90kHz_flag             1   3.0
    //   reserved               7   3.1
    //   if (90kHz_flag == '0') {
    //     N                   32   4.0 uimsbf
    //     K                   32   8.0 uimsbf
    //   }
    //   num_units_in_tick     32 (90khz)?4.0:12.0 uimsbf
    // }
    // fixed_frame_rate_flag    1 (pict_info)?((90khz)?8.0:16.0):3.0
    // temporal_poc_flag        1 (pict_info)?((90khz)?8.1:16.1):3.1
    // picture_to_display_conversion_flag 1 (pict_info)?((90khz)?8.2:16.2):3.2
    // reserved 5 bslbf
};
 
class HEVCVideoDescriptor : public MPEGDescriptor
{
  public:
    explicit HEVCVideoDescriptor(const unsigned char *data, int len = 300) :
        MPEGDescriptor(data, len, DescriptorID::hevc_video) { }
    //       Name                      bits  loc  expected value
    // descriptor_tag                    8   0.0       0x38
    // descriptor_length                 8   1.0
 
    // the encoding of the following is specified in Rec. ITU-T H.265 | ISO/IEC 23008-2
    // profile_space                     2   2.0
    uint ProfileSpace(void)       const { return (m_data[2]&0xC0) >> 6; }
    // tier_flag                         1   2.2
    bool Tier(void)               const { return (m_data[2]&0x20) != 0; }
    // profile_idc                       5   2.3
    uint ProfileIDC(void)         const { return m_data[2]&0x1F; }
    // profile_compatibility_indication 32   3.0
    // progressive_source_flag           1   7.0
    // interlaced_source_flag            1   7.1
    // non_packed_constraint_flag        1   7.2
    // frame_only_constraint_flag        1   7.3
    // reserved_zero_44bits             44   7.4
    // level_idc                         8  13.0
 
    // temporal_layer_subset_flag        1  14.0
    // HEVC_still_present_flag           1  14.1
    // HEVC_24hr_picture_present_flag    1  14.2
    // reserved                          5  14.3
 
    // if temporal_layer_subset_flag == true and
    // descriptor_length == 17 instead of 15 then
    // reserved                          5  15.0
    // temporal_id_min                   3  15.5
    // reserved                          5  16.0
    // temporal_id_max                   3  16.5
 
    QString toString() const override; // MPEGDescriptor
};
 
// class HEVCTimingAndHRDDescriptor : public MPEGDescriptor
// {
//     explicit HEVCTimingAndHRDDescriptor(const unsigned char *data, int len = 300) :
//         MPEGDescriptor(data, len, DescriptorID::hevc_timing_and_hrd) { }
//     //       Name                      bits  loc  expected value
//     // descriptor_tag                    8   0.0       0x38
//     // descriptor_length                 8   1.0
// };
 
#endif // MPEG_DESCRIPTORS_H