182 lines
5.4 KiB
Plaintext
182 lines
5.4 KiB
Plaintext
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Overview
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========
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This is a rdesktop specific extension to the RDPSND protocol to
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support recording.
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The basic protocol is the same as RDPSND (described in rdpsnd.txt),
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but with a bunch of new opcodes.
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A client indicates to the server that it can support recording by
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setting bit 24 (0x00800000) in "Flags" in RDPSND_NEGOTIATE.
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New opcodes
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0x27 RDPSND_REC_NEGOTIATE
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0x28 RDPSND_REC_START
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0x29 RDPSND_REC_STOP
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0x2A RDPSND_REC_DATA
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0x2B RDPSND_REC_SET_VOLUME
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Opcodes
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=======
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The following is a list of the new opcodes and their payload.
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RDPSND_REC_NEGOTIATE
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--------------------
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Sent immediatly after RDPSND_NEGOTIATE when the client indicates that
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it supports recording. Allows the server to determine the
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capabilities of the client.
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The client should reply with an identical packet, with the relevant
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fields filled in, and a filtered list of formats (based on what the
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client supports).
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Flags |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Left channel | Right channel |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Format count | Version |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| ... |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Format tag | Channels |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Frames per sec. |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Bytes per sec. |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Block align | Bits per sample |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Extra size | Extra data ... |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| ... |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Flags
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Flags for capabilities. Currently unused.
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Left channel
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Initial volume for left channel. Reserved when sent from server.
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Right channel
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Initial volume for right channel. Reserved when sent from server.
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Format count
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Number of format structures following the header.
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Version
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Version of the RDPSND record protocol. Current version is 1.
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Format tag
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Audio format type as registered at Microsoft.
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Channels
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Number of channels per frame.
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Frames per sec.
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Frames per second in Hz.
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Bytes per sec.
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Number of bytes per second. Should be the product of
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"Frames per sec." and "Block align".
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Block align
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The size of each frame. Note that not all bytes may contain
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useful data.
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Bits per sample
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Number of bits per sample. Commonly 8 or 16.
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Extra size
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Number of bytes of extra information following this format
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description.
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Extra data
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Optional extra format data. Contents specific to each format
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type.
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RDPSND_REC_START
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----------------
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Sent from the server to tell the client to start recording.
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Format index | |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Format index
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Waveform data format in the form of an index to the previously
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negotiated format list.
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RDPSND_REC_STOP
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---------------
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Tells the client to stop sending record data. Must be sent before a
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new RDPSND_REC_START is sent.
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No payload and no response.
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RDPSND_REC_DATA
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---------------
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Chunk of recorded data. The client is free to choose how much data
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should be queued up before a packet is sent. The payload must not
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exceed 32768 bytes though.
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No response.
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Waveform data |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| ... |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Waveform data
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Binary waveform data in the format specified by the format index.
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Size defined by the packet boundary.
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RDPSND_REC_SET_VOLUME
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---------------------
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Request from the server to the client to change the input volume.
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No response.
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Left channel | Right channel |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Left channel
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Volume of left channel in the range [0, 65535].
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Right channel
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Volume of right channel in the range [0, 65535].
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