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authorClemens Ladisch <clemens@ladisch.de>2009-01-26 02:08:34 -0500
committerTakashi Iwai <tiwai@suse.de>2009-01-26 11:05:02 -0500
commitb7eb4a06e9980973755b7e95a6d97fb8decbf8fd (patch)
treea2d43ef6f4f4448b9659c9a9538acfe2e5fec06d /sound/usb
parent8693290b9038f32b6b9bafd97b7e18465d62655b (diff)
sound: usb-audio: use normal number of frames for no-data URBs
When sending a silence URB (before playback has started, or when it is paused), use the number of frames that would be normally sent instead of a single frame so that the rate at which completion interrupts arrive is consistent. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/usbaudio.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index c709b9563226..417d557ed641 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -525,7 +525,7 @@ static int snd_usb_audio_next_packet_size(struct snd_usb_substream *subs)
525/* 525/*
526 * Prepare urb for streaming before playback starts or when paused. 526 * Prepare urb for streaming before playback starts or when paused.
527 * 527 *
528 * We don't have any data, so we send a frame of silence. 528 * We don't have any data, so we send silence.
529 */ 529 */
530static int prepare_nodata_playback_urb(struct snd_usb_substream *subs, 530static int prepare_nodata_playback_urb(struct snd_usb_substream *subs,
531 struct snd_pcm_runtime *runtime, 531 struct snd_pcm_runtime *runtime,
@@ -537,13 +537,13 @@ static int prepare_nodata_playback_urb(struct snd_usb_substream *subs,
537 537
538 offs = 0; 538 offs = 0;
539 urb->dev = ctx->subs->dev; 539 urb->dev = ctx->subs->dev;
540 urb->number_of_packets = subs->packs_per_ms; 540 for (i = 0; i < ctx->packets; ++i) {
541 for (i = 0; i < subs->packs_per_ms; ++i) {
542 counts = snd_usb_audio_next_packet_size(subs); 541 counts = snd_usb_audio_next_packet_size(subs);
543 urb->iso_frame_desc[i].offset = offs * stride; 542 urb->iso_frame_desc[i].offset = offs * stride;
544 urb->iso_frame_desc[i].length = counts * stride; 543 urb->iso_frame_desc[i].length = counts * stride;
545 offs += counts; 544 offs += counts;
546 } 545 }
546 urb->number_of_packets = ctx->packets;
547 urb->transfer_buffer_length = offs * stride; 547 urb->transfer_buffer_length = offs * stride;
548 memset(urb->transfer_buffer, 548 memset(urb->transfer_buffer,
549 subs->cur_audiofmt->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0, 549 subs->cur_audiofmt->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0,