ALSA: dice: support dual-wire stream format at 192 kHz
Change the AMDTP streaming code to handle the non-standard stream format
that DICE devices use at sample rates greater than 96 kHz.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/sound/firewire/amdtp.h b/sound/firewire/amdtp.h
index 28b1bf5..f3d03dd 100644
--- a/sound/firewire/amdtp.h
+++ b/sound/firewire/amdtp.h
@@ -15,10 +15,15 @@
* @CIP_BLOCKING: In blocking mode, each packet contains either zero or
* SYT_INTERVAL samples, with these two types alternating so that
* the overall sample rate comes out right.
+ * @CIP_HI_DUALWIRE: At rates above 96 kHz, pretend that the stream runs
+ * at half the actual sample rate with twice the number of channels;
+ * two samples of a channel are stored consecutively in the packet.
+ * Requires blocking mode and SYT_INTERVAL-aligned PCM buffer size.
*/
enum cip_out_flags {
CIP_NONBLOCKING = 0x00,
CIP_BLOCKING = 0x01,
+ CIP_HI_DUALWIRE = 0x02,
};
/**
@@ -32,6 +37,7 @@
CIP_SFC_96000 = 4,
CIP_SFC_176400 = 5,
CIP_SFC_192000 = 6,
+ CIP_SFC_COUNT
};
#define AMDTP_OUT_PCM_FORMAT_BITS (SNDRV_PCM_FMTBIT_S16 | \
@@ -48,6 +54,7 @@
struct mutex mutex;
enum cip_sfc sfc;
+ bool dual_wire;
unsigned int data_block_quadlets;
unsigned int pcm_channels;
unsigned int midi_ports;
@@ -80,7 +87,10 @@
enum cip_out_flags flags);
void amdtp_out_stream_destroy(struct amdtp_out_stream *s);
-void amdtp_out_stream_set_rate(struct amdtp_out_stream *s, unsigned int rate);
+void amdtp_out_stream_set_parameters(struct amdtp_out_stream *s,
+ unsigned int rate,
+ unsigned int pcm_channels,
+ unsigned int midi_ports);
unsigned int amdtp_out_stream_get_max_payload(struct amdtp_out_stream *s);
int amdtp_out_stream_start(struct amdtp_out_stream *s, int channel, int speed);
@@ -93,39 +103,14 @@
unsigned long amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s);
void amdtp_out_stream_pcm_abort(struct amdtp_out_stream *s);
+extern unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
+
static inline bool amdtp_out_stream_running(struct amdtp_out_stream *s)
{
return !IS_ERR(s->context);
}
/**
- * amdtp_out_stream_set_pcm - configure format of PCM samples
- * @s: the AMDTP output stream to be configured
- * @pcm_channels: the number of PCM samples in each data block, to be encoded
- * as AM824 multi-bit linear audio
- *
- * This function must not be called while the stream is running.
- */
-static inline void amdtp_out_stream_set_pcm(struct amdtp_out_stream *s,
- unsigned int pcm_channels)
-{
- s->pcm_channels = pcm_channels;
-}
-
-/**
- * amdtp_out_stream_set_midi - configure format of MIDI data
- * @s: the AMDTP output stream to be configured
- * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels)
- *
- * This function must not be called while the stream is running.
- */
-static inline void amdtp_out_stream_set_midi(struct amdtp_out_stream *s,
- unsigned int midi_ports)
-{
- s->midi_ports = midi_ports;
-}
-
-/**
* amdtp_out_streaming_error - check for streaming error
* @s: the AMDTP output stream
*