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Overview |
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======== |
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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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|
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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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|
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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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|
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New opcodes |
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|
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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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|
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Opcodes |
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======= |
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|
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The following is a list of the new opcodes and their payload. |
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|
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RDPSND_REC_NEGOTIATE |
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-------------------- |
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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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|
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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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|
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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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|
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Flags |
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|
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Flags for capabilities. Currently unused. |
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|
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Left channel |
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|
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Initial volume for left channel. Reserved when sent from server. |
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|
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Right channel |
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|
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Initial volume for right channel. Reserved when sent from server. |
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|
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Format count |
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|
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Number of format structures following the header. |
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|
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Version |
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|
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Version of the RDPSND record protocol. Current version is 1. |
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|
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Format tag |
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|
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Audio format type as registered at Microsoft. |
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|
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Channels |
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|
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Number of channels per frame. |
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|
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Frames per sec. |
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|
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Frames per second in Hz. |
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|
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Bytes per sec. |
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|
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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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|
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Block align |
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|
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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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|
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Bits per sample |
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|
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Number of bits per sample. Commonly 8 or 16. |
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|
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Extra size |
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|
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Number of bytes of extra information following this format |
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description. |
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|
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Extra data |
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|
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Optional extra format data. Contents specific to each format |
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type. |
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|
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RDPSND_REC_START |
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---------------- |
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|
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Sent from the server to tell the client to start recording. |
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|
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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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|
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Format index |
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|
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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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|
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RDPSND_REC_STOP |
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--------------- |
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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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|
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No payload and no response. |
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|
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RDPSND_REC_DATA |
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--------------- |
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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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|
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No response. |
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|
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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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|
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Waveform data |
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|
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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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|
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RDPSND_REC_SET_VOLUME |
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--------------------- |
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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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|
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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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|
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Left channel |
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|
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Volume of left channel in the range [0, 65535]. |
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|
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Right channel |
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|
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Volume of right channel in the range [0, 65535]. |
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