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| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2017-06-08 09:11:03 +0900 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2017-06-08 09:15:44 +0200 |
| commit | 55799c5ab99e8762e58c387e39f9fa36e8f14158 (patch) | |
| tree | 77cfa81930583eeeec15f0ef783b1d9be9475986 /sound/firewire/amdtp-stream.c | |
| parent | c6706de0ce8bc8cd1e336b8cf0acabf1adedba6c (diff) | |
| download | lwn-55799c5ab99e8762e58c387e39f9fa36e8f14158.tar.gz lwn-55799c5ab99e8762e58c387e39f9fa36e8f14158.zip | |
ALSA: firewire: arrange common PCM info/constraints for AMDTP engine applications
In ALSA firewire stack, 8 drivers uses IEC 61883-1/6 engine for data
transmission. They have common PCM info/constraints and duplicated codes.
This commit unifies the codes into fireiwre-lib.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/amdtp-stream.c')
| -rw-r--r-- | sound/firewire/amdtp-stream.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c index 4316d9db404d..9678bc75dc5b 100644 --- a/sound/firewire/amdtp-stream.c +++ b/sound/firewire/amdtp-stream.c @@ -148,8 +148,27 @@ EXPORT_SYMBOL(amdtp_rate_table); int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s, struct snd_pcm_runtime *runtime) { + struct snd_pcm_hardware *hw = &runtime->hw; int err; + hw->info = SNDRV_PCM_INFO_BATCH | + SNDRV_PCM_INFO_BLOCK_TRANSFER | + SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_JOINT_DUPLEX | + SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID; + + /* SNDRV_PCM_INFO_BATCH */ + hw->periods_min = 2; + hw->periods_max = UINT_MAX; + + /* bytes for a frame */ + hw->period_bytes_min = 4 * hw->channels_max; + + /* Just to prevent from allocating much pages. */ + hw->period_bytes_max = hw->period_bytes_min * 2048; + hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min; + /* * Currently firewire-lib processes 16 packets in one software * interrupt callback. This equals to 2msec but actually the |