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https://gitlab.freedesktop.org/pipewire/pipewire
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add continuation packet
Add continuation type packet that would make it possible to send commands using a piece of shared memory.
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@ -55,18 +55,27 @@ Wire
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Fixed header
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<version> : 4 bytes : total message length
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<version> : 4 bytes : message version
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<length> : 4 bytes : total message length
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Followed by 1 or more type-length-data sections
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<type> : 1 byte
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<length> : variable length, 7 bits, hight bit is continuation marker
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<length> : variable length, 7 bits, high bit is continuation marker
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<data> : <length> bytes, see below for contents based on <type>
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Types:
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1: header
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1: continuation section
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Rest of the commands can be found in the shared memory region at
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@offset and @size. A shared memory region is negotiated when the client
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connects to the server.
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<offset> : 8 bytes : offset
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<size> : 8 bytes : size
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2: header
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Header for payload
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@ -75,27 +84,33 @@ Types:
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<pts> : 8 bytes : presentation time
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<dts-offset> : 8 bytes : dts-offset
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2: fd-payload section
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3: fd-payload section
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Used to send a buffer between client and server.
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Used to send a block of data between client and server. The type of fd and
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the possible operations on it are negotiated when the client connects.
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<id> : 4 bytes : id of the fd-payload
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<offset> : 8 bytes : offset
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<size> : 8 bytes : size
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<fd-index> : 4 bytes : index of fd
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3: release fd-payload
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4: release fd-payload
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Release a fd-payload with <id>
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<id> : 4 bytes : the id number of the released fd-payload
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4: format change
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5: format change
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Perform an in-band format change. The following data blocks will be in this
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new format.
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<format-id> : 1 byte : format id
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<format> : 0-terminated : contains serialized format
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5: property changes
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6: property changes
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Notify a property change.
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<key> : 0-terminated : key
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<value> : 0-terminated : value
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@ -56,6 +56,8 @@ gpointer pinos_buffer_steal (PinosBuffer *buffer,
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/**
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* PinosPacketType:
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* @PINOS_PACKET_TYPE_INVALID: invalid packet type, ignore
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* @PINOS_PACKET_TYPE_CONTINUATION: continuation packet, used internally to send
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* commands using a shared memory region.
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* @PINOS_PACKET_TYPE_HEADER: common packet header
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* @PINOS_PACKET_TYPE_FD_PAYLOAD: packet contains fd-payload. An fd-payload contains
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* the media data as a file descriptor
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@ -69,11 +71,12 @@ gpointer pinos_buffer_steal (PinosBuffer *buffer,
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typedef enum {
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PINOS_PACKET_TYPE_INVALID = 0,
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PINOS_PACKET_TYPE_HEADER = 1,
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PINOS_PACKET_TYPE_FD_PAYLOAD = 2,
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PINOS_PACKET_TYPE_RELEASE_FD_PAYLOAD = 3,
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PINOS_PACKET_TYPE_FORMAT_CHANGE = 4,
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PINOS_PACKET_TYPE_PROPERTY_CHANGE = 5,
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PINOS_PACKET_TYPE_CONTINUATION = 1,
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PINOS_PACKET_TYPE_HEADER = 2,
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PINOS_PACKET_TYPE_FD_PAYLOAD = 3,
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PINOS_PACKET_TYPE_RELEASE_FD_PAYLOAD = 4,
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PINOS_PACKET_TYPE_FORMAT_CHANGE = 5,
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PINOS_PACKET_TYPE_PROPERTY_CHANGE = 6,
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} PinosPacketType;
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