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-rw-r--r--drivers/ieee1394/amdtp.h84
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diff --git a/drivers/ieee1394/amdtp.h b/drivers/ieee1394/amdtp.h
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index 531f28e3ab5..00000000000
--- a/drivers/ieee1394/amdtp.h
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-/* -*- c-basic-offset: 8 -*- */
-
-#ifndef __AMDTP_H
-#define __AMDTP_H
-
-#include <asm/types.h>
-#include "ieee1394-ioctl.h"
-
-/* The userspace interface for the Audio & Music Data Transmission
- * Protocol driver is really simple. First, open /dev/amdtp, use the
- * ioctl to configure format, rate, dimension and either plug or
- * channel, then start writing samples.
- *
- * The formats supported by the driver are listed below.
- * AMDTP_FORMAT_RAW corresponds to the AM824 raw format, which can
- * carry any number of channels, so use this if you're streaming
- * multichannel audio. The AMDTP_FORMAT_IEC958_PCM corresponds to the
- * AM824 IEC958 encapsulation without the IEC958 data bit set, using
- * AMDTP_FORMAT_IEC958_AC3 will transmit the samples with the data bit
- * set, suitable for transmitting compressed AC-3 audio.
- *
- * The rate field specifies the transmission rate; supported values
- * are 32000, 44100, 48000, 88200, 96000, 176400 and 192000.
- *
- * The dimension field specifies the dimension of the signal, that is,
- * the number of audio channels. Only AMDTP_FORMAT_RAW supports
- * settings greater than 2.
- *
- * The mode field specifies which transmission mode to use. The AMDTP
- * specifies two different transmission modes: blocking and
- * non-blocking. The blocking transmission mode always send a fixed
- * number of samples, typically 8, 16 or 32. To exactly match the
- * transmission rate, the driver alternates between sending empty and
- * non-empty packets. In non-blocking mode, the driver transmits as
- * small packets as possible. For example, for a transmission rate of
- * 44100Hz, the driver should send 5 41/80 samples in every cycle, but
- * this is not possible so instead the driver alternates between
- * sending 5 and 6 samples.
- *
- * The last thing to specify is either the isochronous channel to use
- * or the output plug to connect to. If you know what channel the
- * destination device will listen on, you can specify the channel
- * directly and use the AMDTP_IOC_CHANNEL ioctl. However, if the
- * destination device chooses the channel and uses the IEC61883-1 plug
- * mechanism, you can specify an output plug to connect to. The
- * driver will pick up the channel number from the plug once the
- * destination device locks the output plug control register. In this
- * case set the plug field and use the AMDTP_IOC_PLUG ioctl.
- *
- * Having configured the interface, the driver now accepts writes of
- * regular 16 bit signed little endian samples, with the channels
- * interleaved. For example, 4 channels would look like:
- *
- * | sample 0 | sample 1 ...
- * | ch. 0 | ch. 1 | ch. 2 | ch. 3 | ch. 0 | ...
- * | lsb | msb | lsb | msb | lsb | msb | lsb | msb | lsb | msb | ...
- *
- */
-
-enum {
- AMDTP_FORMAT_RAW,
- AMDTP_FORMAT_IEC958_PCM,
- AMDTP_FORMAT_IEC958_AC3
-};
-
-enum {
- AMDTP_MODE_BLOCKING,
- AMDTP_MODE_NON_BLOCKING,
-};
-
-enum {
- AMDTP_INPUT_LE16,
- AMDTP_INPUT_BE16,
-};
-
-struct amdtp_ioctl {
- __u32 format;
- __u32 rate;
- __u32 dimension;
- __u32 mode;
- union { __u32 channel; __u32 plug; } u;
-};
-
-#endif /* __AMDTP_H */