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-rw-r--r--sound/usb/usbaudio.c76
1 files changed, 37 insertions, 39 deletions
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 286fa14..8fcb5d5 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -173,7 +173,7 @@ struct snd_usb_substream {
unsigned int running: 1; /* running status */
- unsigned int hwptr_done; /* processed frame position in the buffer */
+ unsigned int hwptr_done; /* processed byte position in the buffer */
unsigned int transfer_done; /* processed frames since last period update */
unsigned long active_mask; /* bitmask of active urbs */
unsigned long unlink_mask; /* bitmask of unlinked urbs */
@@ -342,7 +342,7 @@ static int retire_capture_urb(struct snd_usb_substream *subs,
unsigned long flags;
unsigned char *cp;
int i;
- unsigned int stride, len, oldptr;
+ unsigned int stride, frames, bytes, oldptr;
int period_elapsed = 0;
stride = runtime->frame_bits >> 3;
@@ -353,29 +353,28 @@ static int retire_capture_urb(struct snd_usb_substream *subs,
snd_printd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
// continue;
}
- len = urb->iso_frame_desc[i].actual_length / stride;
- if (! len)
- continue;
+ frames = urb->iso_frame_desc[i].actual_length / stride;
+ bytes = frames * stride;
/* update the current pointer */
spin_lock_irqsave(&subs->lock, flags);
oldptr = subs->hwptr_done;
- subs->hwptr_done += len;
- if (subs->hwptr_done >= runtime->buffer_size)
- subs->hwptr_done -= runtime->buffer_size;
- subs->transfer_done += len;
+ subs->hwptr_done += bytes;
+ if (subs->hwptr_done >= runtime->buffer_size * stride)
+ subs->hwptr_done -= runtime->buffer_size * stride;
+ subs->transfer_done += frames;
if (subs->transfer_done >= runtime->period_size) {
subs->transfer_done -= runtime->period_size;
period_elapsed = 1;
}
spin_unlock_irqrestore(&subs->lock, flags);
/* copy a data chunk */
- if (oldptr + len > runtime->buffer_size) {
- unsigned int cnt = runtime->buffer_size - oldptr;
- unsigned int blen = cnt * stride;
- memcpy(runtime->dma_area + oldptr * stride, cp, blen);
- memcpy(runtime->dma_area, cp + blen, len * stride - blen);
+ if (oldptr + bytes > runtime->buffer_size * stride) {
+ unsigned int bytes1 =
+ runtime->buffer_size * stride - oldptr;
+ memcpy(runtime->dma_area + oldptr, cp, bytes1);
+ memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
} else {
- memcpy(runtime->dma_area + oldptr * stride, cp, len * stride);
+ memcpy(runtime->dma_area + oldptr, cp, bytes);
}
}
if (period_elapsed)
@@ -562,24 +561,24 @@ static int prepare_playback_urb(struct snd_usb_substream *subs,
struct snd_pcm_runtime *runtime,
struct urb *urb)
{
- int i, stride, offs;
- unsigned int counts;
+ int i, stride;
+ unsigned int counts, frames, bytes;
unsigned long flags;
int period_elapsed = 0;
struct snd_urb_ctx *ctx = urb->context;
stride = runtime->frame_bits >> 3;
- offs = 0;
+ frames = 0;
urb->dev = ctx->subs->dev; /* we need to set this at each time */
urb->number_of_packets = 0;
spin_lock_irqsave(&subs->lock, flags);
for (i = 0; i < ctx->packets; i++) {
counts = snd_usb_audio_next_packet_size(subs);
/* set up descriptor */
- urb->iso_frame_desc[i].offset = offs * stride;
+ urb->iso_frame_desc[i].offset = frames * stride;
urb->iso_frame_desc[i].length = counts * stride;
- offs += counts;
+ frames += counts;
urb->number_of_packets++;
subs->transfer_done += counts;
if (subs->transfer_done >= runtime->period_size) {
@@ -589,7 +588,7 @@ static int prepare_playback_urb(struct snd_usb_substream *subs,
if (subs->transfer_done > 0) {
/* FIXME: fill-max mode is not
* supported yet */
- offs -= subs->transfer_done;
+ frames -= subs->transfer_done;
counts -= subs->transfer_done;
urb->iso_frame_desc[i].length =
counts * stride;
@@ -599,7 +598,7 @@ static int prepare_playback_urb(struct snd_usb_substream *subs,
if (i < ctx->packets) {
/* add a transfer delimiter */
urb->iso_frame_desc[i].offset =
- offs * stride;
+ frames * stride;
urb->iso_frame_desc[i].length = 0;
urb->number_of_packets++;
}
@@ -609,26 +608,25 @@ static int prepare_playback_urb(struct snd_usb_substream *subs,
if (period_elapsed) /* finish at the period boundary */
break;
}
- if (subs->hwptr_done + offs > runtime->buffer_size) {
+ bytes = frames * stride;
+ if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
/* err, the transferred area goes over buffer boundary. */
- unsigned int len = runtime->buffer_size - subs->hwptr_done;
+ unsigned int bytes1 =
+ runtime->buffer_size * stride - subs->hwptr_done;
memcpy(urb->transfer_buffer,
- runtime->dma_area + subs->hwptr_done * stride,
- len * stride);
- memcpy(urb->transfer_buffer + len * stride,
- runtime->dma_area,
- (offs - len) * stride);
+ runtime->dma_area + subs->hwptr_done, bytes1);
+ memcpy(urb->transfer_buffer + bytes1,
+ runtime->dma_area, bytes - bytes1);
} else {
memcpy(urb->transfer_buffer,
- runtime->dma_area + subs->hwptr_done * stride,
- offs * stride);
+ runtime->dma_area + subs->hwptr_done, bytes);
}
- subs->hwptr_done += offs;
- if (subs->hwptr_done >= runtime->buffer_size)
- subs->hwptr_done -= runtime->buffer_size;
- runtime->delay += offs;
+ subs->hwptr_done += bytes;
+ if (subs->hwptr_done >= runtime->buffer_size * stride)
+ subs->hwptr_done -= runtime->buffer_size * stride;
+ runtime->delay += frames;
spin_unlock_irqrestore(&subs->lock, flags);
- urb->transfer_buffer_length = offs * stride;
+ urb->transfer_buffer_length = bytes;
if (period_elapsed)
snd_pcm_period_elapsed(subs->pcm_substream);
return 0;
@@ -901,18 +899,18 @@ static int wait_clear_urbs(struct snd_usb_substream *subs)
/*
- * return the current pcm pointer. just return the hwptr_done value.
+ * return the current pcm pointer. just based on the hwptr_done value.
*/
static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_usb_substream *subs;
- snd_pcm_uframes_t hwptr_done;
+ unsigned int hwptr_done;
subs = (struct snd_usb_substream *)substream->runtime->private_data;
spin_lock(&subs->lock);
hwptr_done = subs->hwptr_done;
spin_unlock(&subs->lock);
- return hwptr_done;
+ return hwptr_done / (substream->runtime->frame_bits >> 3);
}
generated by cgit v1.1 at 2024-12-26 12:55:00 +0000