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Add RTP header fields for the full frame length and offset.

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This also adds RTPCapabilities and a header field to tell the receiver
about capabilities used in encoding this frame. It is intended to contain
settings relevant to the current frame being sent.
This commit is contained in:
iphydf 2018-01-29 16:05:12 +00:00
parent 6f6c4dc2bd
commit 623e9ac331
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GPG Key ID: 3855DBA2D74403C9
1 changed files with 50 additions and 5 deletions
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55
toxav/rtp.h
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@ -32,7 +32,19 @@
*/
enum {
rtp_TypeAudio = 192,
rtp_TypeVideo,
rtp_TypeVideo = 193,
};
/**
* A bit mask (up to 32 bits) specifying features of the current frame affecting
* the behaviour of the decoder.
*/
enum RTPCapabilities {
/**
* Support frames larger than 64KiB. The full 32 bit length and offset are
* set in \ref RTPHeader::data_length_full and \ref RTPHeader::offset_full.
*/
RTP_LARGE_FRAME = 1 << 0,
};
struct RTPHeader {
@ -58,11 +70,44 @@ struct RTPHeader {
uint16_t sequnum;
uint32_t timestamp;
uint32_t ssrc;
uint32_t csrc[16];
/* Non-standard TOX-specific fields */
uint16_t offset_lower;/* Data offset of the current part */
uint16_t data_length_lower; /* Total message length */
/* Non-standard Tox-specific fields */
/**
* Bit mask of \ref RTPCapabilities setting features for the current frame.
*/
uint32_t capabilities;
/**
* The full 32 bit data offset of the current data chunk. The \ref
* offset_lower data member contains the lower 16 bits of this value. For
* frames smaller than 64KiB, \ref offset_full and \ref offset_lower are
* equal.
*/
uint32_t offset_full;
/**
* The full 32 bit payload length without header and packet id.
*/
uint32_t data_length_full;
/**
* Only the receiver uses this field (why do we have this?).
*/
uint32_t received_length_full;
/**
* Unused fields. If you want to add more information to this header, remove
* one csrc and add the appropriate number of fields in its place.
*/
uint32_t csrc[12];
/**
* Data offset of the current part (lower bits).
*/
uint16_t offset_lower;
/**
* Total message length (lower bits).
*/
uint16_t data_length_lower;
} __attribute__((packed));
/* Check alignment */