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ALSA: firewire-lib: Add support for channel mapping

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Some devices arrange the position of PCM/MIDI data channel in AMDTP packet.
This commit allows drivers to set channel mapping.

To be simple, the mapping table is an array with fixed length. Then the number
of channels for PCM is restricted by 64 channels.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto
2014-04-25 22:44:50 +09:00
committed by Takashi Iwai
parent 7b3b0d8583
commit 77d2a8a4f6
2 changed files with 79 additions and 47 deletions
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8
sound/firewire/amdtp.h
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@@ -50,6 +50,12 @@ enum cip_sfc {
SNDRV_PCM_FMTBIT_S32)
/*
* This module supports maximum 64 PCM channels for one PCM stream
* This is for our convenience.
*/
#define AMDTP_MAX_CHANNELS_FOR_PCM 64
/*
* AMDTP packet can include channels for MIDI conformant data.
* Each MIDI conformant data channel includes 8 MPX-MIDI data stream.
@@ -85,6 +91,8 @@ struct amdtp_stream {
void (*transfer_samples)(struct amdtp_stream *s,
struct snd_pcm_substream *pcm,
__be32 *buffer, unsigned int frames);
u8 pcm_positions[AMDTP_MAX_CHANNELS_FOR_PCM];
u8 midi_position;
unsigned int syt_interval;
unsigned int transfer_delay;