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update readme

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This commit is contained in:
winlin 2017-02-03 14:57:28 +08:00
parent ac7ee10b60
commit e8eb050bf2
5 changed files with 162 additions and 15 deletions
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54
trunk/src/kernel/srs_kernel_mp4.hpp
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@ -81,9 +81,18 @@ enum SrsMp4BoxType
SrsMp4BoxTypeMP4A = 0x6d703461, // 'mp4a'
SrsMp4BoxTypeESDS = 0x65736473, // 'esds'
SrsMp4BoxTypeUDTA = 0x75647461, // 'udta'
};
/**
* 8.4.3.3 Semantics
* ISO_IEC_14496-12-base-format-2012.pdf, page 37
*/
enum SrsMp4HandlerType
{
SrsMp4HandlerTypeForbidden = 0x00,
SrsMp4BoxTypeVIDE = 0x76696465, // 'vide'
SrsMp4BoxTypeSOUN = 0x736f756e, // 'soun'
SrsMp4HandlerTypeVIDE = 0x76696465, // 'vide'
SrsMp4HandlerTypeSOUN = 0x736f756e, // 'soun'
};
/**
@ -121,7 +130,7 @@ public:
SrsMp4BoxType type;
// For box 'uuid'.
uint8_t* usertype;
private:
protected:
std::vector<SrsMp4Box*> boxes;
private:
// The position at buffer to start demux the box.
@ -138,6 +147,9 @@ public:
virtual bool is_ftyp();
virtual bool is_moov();
virtual bool is_mdat();
// Get the contained box of specific type.
// @return The first matched box.
virtual SrsMp4Box* get(SrsMp4BoxType bt);
/**
* Discovery the box from buffer.
* @param ppbox Output the discoveried box, which user must free it.
@ -252,6 +264,9 @@ protected:
virtual int decode_header(SrsBuffer* buf);
};
class SrsMp4TrackBox;
class SrsMp4MovieHeaderBox;
/**
* 8.2.1 Movie Box (moov)
* ISO_IEC_14496-12-base-format-2012.pdf, page 30
@ -263,6 +278,13 @@ class SrsMp4MovieBox : public SrsMp4Box
public:
SrsMp4MovieBox();
virtual ~SrsMp4MovieBox();
public:
// Get the header of moov.
virtual SrsMp4MovieHeaderBox* mvhd();
// Get the first video track.
virtual SrsMp4TrackBox* video();
// Get the first audio track.
virtual SrsMp4TrackBox* audio();
protected:
virtual int nb_header();
virtual int encode_header(SrsBuffer* buf);
@ -282,6 +304,7 @@ public:
// an integer that declares the most recent time the presentation was modified (in
// seconds since midnight, Jan. 1, 1904, in UTC time)
uint64_t modification_time;
private:
// an integer that specifies the time-scale for the entire presentation; this is the number of
// time units that pass in one second. For example, a time coordinate system that measures time in
// sixtieths of a second has a time scale of 60.
@ -289,7 +312,7 @@ public:
// an integer that declares length of the presentation (in the indicated timescale). This property
// is derived from the presentation’s tracks: the value of this field corresponds to the duration of the
// longest track in the presentation. If the duration cannot be determined then duration is set to all 1s.
uint64_t duration;
uint64_t duration_in_tbn;
public:
// a fixed point 16.16 number that indicates the preferred rate to play the presentation; 1.0
// (0x00010000) is normal forward playback
@ -309,12 +332,23 @@ public:
public:
SrsMp4MovieHeaderBox();
virtual ~SrsMp4MovieHeaderBox();
public:
// Get the duration in ms.
virtual uint64_t duration();
protected:
virtual int nb_header();
virtual int encode_header(SrsBuffer* buf);
virtual int decode_header(SrsBuffer* buf);
};
// The type of track, maybe combine of types.
enum SrsMp4TrackType
{
SrsMp4TrackTypeForbidden = 0x00,
SrsMp4TrackTypeAudio = 0x01,
SrsMp4TrackTypeVideo = 0x02,
};
/**
* 8.3.1 Track Box (trak)
* ISO_IEC_14496-12-base-format-2012.pdf, page 32
@ -327,6 +361,11 @@ class SrsMp4TrackBox : public SrsMp4Box
public:
SrsMp4TrackBox();
virtual ~SrsMp4TrackBox();
public:
// Get the type of track, maybe combine of track type,
// for example, it maybe Audio|Video when contains both.
// Generally, only single type, no combination.
virtual SrsMp4TrackType track_type();
};
/**
@ -458,6 +497,11 @@ class SrsMp4MediaBox : public SrsMp4Box
public:
SrsMp4MediaBox();
virtual ~SrsMp4MediaBox();
public:
// Get the type of track, maybe combine of track type,
// for example, it maybe Audio|Video when contains both.
// Generally, only single type, no combination.
virtual SrsMp4TrackType track_type();
};
/**
@ -521,7 +565,7 @@ public:
// an integer containing one of the following values, or a value from a derived specification:
// ‘vide’, Video track
// ‘soun’, Audio track
uint32_t handler_type;
SrsMp4HandlerType handler_type;
uint32_t reserved[3];
// a null-terminated string in UTF-8 characters which gives a human-readable name for the track
// type (for debugging and inspection purposes).