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-rw-r--r--sound/usb/card.h7
-rw-r--r--sound/usb/endpoint.c9
-rw-r--r--sound/usb/pcm.c87
3 files changed, 92 insertions, 11 deletions
diff --git a/sound/usb/card.h b/sound/usb/card.h
index d32ea411545a..ac55477ce6dd 100644
--- a/sound/usb/card.h
+++ b/sound/usb/card.h
@@ -28,6 +28,7 @@ struct audioformat {
unsigned int *rate_table; /* rate table */
unsigned char clock; /* associated clock */
struct snd_pcm_chmap_elem *chmap; /* (optional) channel map */
+ bool dsd_dop; /* add DOP headers in case of DSD samples */
};
struct snd_usb_substream;
@@ -139,6 +140,12 @@ struct snd_usb_substream {
int last_frame_number; /* stored frame number */
int last_delay; /* stored delay */
+
+ struct {
+ int marker;
+ int channel;
+ int byte_idx;
+ } dsd_dop;
};
struct snd_usb_stream {
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 7e9c55a73540..32d0b41a1ff6 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -578,6 +578,15 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,
int is_playback = usb_pipeout(ep->pipe);
int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels;
+ if (pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) {
+ /*
+ * When operating in DSD DOP mode, the size of a sample frame
+ * in hardware differs from the actual physical format width
+ * because we need to make room for the DOP markers.
+ */
+ frame_bits += channels << 3;
+ }
+
ep->datainterval = fmt->datainterval;
ep->stride = frame_bits >> 3;
ep->silence_value = pcm_format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0;
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 099c0fe0d1e1..4cd917cf058e 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -1120,6 +1120,12 @@ static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
runtime->private_data = subs;
subs->pcm_substream = substream;
/* runtime PM is also done there */
+
+ /* initialize DSD/DOP context */
+ subs->dsd_dop.byte_idx = 0;
+ subs->dsd_dop.channel = 0;
+ subs->dsd_dop.marker = 1;
+
return setup_hw_info(runtime, subs);
}
@@ -1214,6 +1220,56 @@ static void retire_capture_urb(struct snd_usb_substream *subs,
snd_pcm_period_elapsed(subs->pcm_substream);
}
+static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
+ struct urb *urb, unsigned int bytes)
+{
+ struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
+ unsigned int stride = runtime->frame_bits >> 3;
+ unsigned int dst_idx = 0;
+ unsigned int src_idx = subs->hwptr_done;
+ unsigned int wrap = runtime->buffer_size * stride;
+ u8 *dst = urb->transfer_buffer;
+ u8 *src = runtime->dma_area;
+ u8 marker[] = { 0x05, 0xfa };
+
+ /*
+ * The DSP DOP format defines a way to transport DSD samples over
+ * normal PCM data endpoints. It requires stuffing of marker bytes
+ * (0x05 and 0xfa, alternating per sample frame), and then expects
+ * 2 additional bytes of actual payload. The whole frame is stored
+ * LSB.
+ *
+ * Hence, for a stereo transport, the buffer layout looks like this,
+ * where L refers to left channel samples and R to right.
+ *
+ * L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
+ * L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
+ * .....
+ *
+ */
+
+ while (bytes--) {
+ if (++subs->dsd_dop.byte_idx == 3) {
+ /* frame boundary? */
+ dst[dst_idx++] = marker[subs->dsd_dop.marker];
+ src_idx += 2;
+ subs->dsd_dop.byte_idx = 0;
+
+ if (++subs->dsd_dop.channel % runtime->channels == 0) {
+ /* alternate the marker */
+ subs->dsd_dop.marker++;
+ subs->dsd_dop.marker %= ARRAY_SIZE(marker);
+ subs->dsd_dop.channel = 0;
+ }
+ } else {
+ /* stuff the DSD payload */
+ int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
+ dst[dst_idx++] = src[idx];
+ subs->hwptr_done++;
+ }
+ }
+}
+
static void prepare_playback_urb(struct snd_usb_substream *subs,
struct urb *urb)
{
@@ -1270,19 +1326,28 @@ static void prepare_playback_urb(struct snd_usb_substream *subs,
break;
}
bytes = frames * ep->stride;
- if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
- /* err, the transferred area goes over buffer boundary. */
- unsigned int bytes1 =
- runtime->buffer_size * stride - subs->hwptr_done;
- memcpy(urb->transfer_buffer,
- runtime->dma_area + subs->hwptr_done, bytes1);
- memcpy(urb->transfer_buffer + bytes1,
- runtime->dma_area, bytes - bytes1);
+
+ if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
+ subs->cur_audiofmt->dsd_dop)) {
+ fill_playback_urb_dsd_dop(subs, urb, bytes);
} else {
- memcpy(urb->transfer_buffer,
- runtime->dma_area + subs->hwptr_done, bytes);
+ /* usual PCM */
+ if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
+ /* err, the transferred area goes over buffer boundary. */
+ unsigned int bytes1 =
+ runtime->buffer_size * stride - subs->hwptr_done;
+ memcpy(urb->transfer_buffer,
+ 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, bytes);
+ }
+
+ subs->hwptr_done += bytes;
}
- subs->hwptr_done += bytes;
+
if (subs->hwptr_done >= runtime->buffer_size * stride)
subs->hwptr_done -= runtime->buffer_size * stride;