ALSA: improve buffer size computations for USB PCM audio
This patch changes the way URBs are allocated and their sizes are determined for PCM playback in the snd-usb-audio driver. Currently the driver allocates too few URBs for endpoints that don't use implicit sync, making underruns more likely to occur. This may be a holdover from before I/O delays could be measured accurately; in any case, it is no longer necessary. The patch allocates as many URBs as possible, subject to four limitations: The total number of URBs for the endpoint is not allowed to exceed MAX_URBS (which the patch increases from 8 to 12). The total number of packets per URB is not allowed to exceed MAX_PACKS (or MAX_PACKS_HS for high-speed devices), which is decreased from 20 to 6. The total duration of queued data is not allowed to exceed MAX_QUEUE, which is decreased from 24 ms to 18 ms. The total number of ALSA frames in the output queue is not allowed to exceed the ALSA buffer size. The last requirement is the hardest to implement. Currently the number of URBs needed to fill a buffer cannot be determined in advance, because a buffer contains a fixed number of frames whereas the number of frames in an URB varies to match shifts in the device's clock rate. To solve this problem, the patch changes the logic for deciding how many packets an URB should contain. Rather than using as many as possible without exceeding an ALSA period boundary, now the driver uses only as many packets as needed to transfer a predetermined number of frames. As a result, unless the device's clock has an exceedingly variable rate, the number of URBs making up each period (and hence each buffer) will remain constant. The overall effect of the patch is that playback works better in low-latency settings. The user can still specify values for frames/period and periods/buffer that exceed the capabilities of the hardware, of course. But for values that are within those capabilities, the performance will be improved. For example, testing shows that a high-speed device can handle 32 frames/period and 3 periods/buffer at 48 KHz, whereas the current driver starts to get glitchy at 64 frames/period and 2 periods/buffer. A side effect of these changes is that the "nrpacks" module parameter is no longer used. The patch removes it. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: Clemens Ladisch <clemens@ladisch.de> Tested-by: Daniel Mack <zonque@gmail.com> Tested-by: Eldad Zack <eldad@fogrefinery.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
parent
e8bc99425e
commit
976b6c064a
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@ -79,7 +79,6 @@ static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;/* Enable this card *
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/* Vendor/product IDs for this card */
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/* Vendor/product IDs for this card */
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static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
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static int vid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
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static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
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static int pid[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = -1 };
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static int nrpacks = 8; /* max. number of packets per urb */
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static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
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static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
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static bool ignore_ctl_error;
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static bool ignore_ctl_error;
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static bool autoclock = true;
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static bool autoclock = true;
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@ -94,8 +93,6 @@ module_param_array(vid, int, NULL, 0444);
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MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
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MODULE_PARM_DESC(vid, "Vendor ID for the USB audio device.");
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module_param_array(pid, int, NULL, 0444);
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module_param_array(pid, int, NULL, 0444);
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MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
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MODULE_PARM_DESC(pid, "Product ID for the USB audio device.");
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module_param(nrpacks, int, 0644);
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MODULE_PARM_DESC(nrpacks, "Max. number of packets per URB.");
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module_param_array(device_setup, int, NULL, 0444);
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module_param_array(device_setup, int, NULL, 0444);
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MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
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MODULE_PARM_DESC(device_setup, "Specific device setup (if needed).");
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module_param(ignore_ctl_error, bool, 0444);
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module_param(ignore_ctl_error, bool, 0444);
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@ -374,7 +371,6 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx,
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chip->dev = dev;
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chip->dev = dev;
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chip->card = card;
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chip->card = card;
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chip->setup = device_setup[idx];
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chip->setup = device_setup[idx];
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chip->nrpacks = nrpacks;
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chip->autoclock = autoclock;
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chip->autoclock = autoclock;
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chip->probing = 1;
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chip->probing = 1;
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@ -756,10 +752,6 @@ static struct usb_driver usb_audio_driver = {
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static int __init snd_usb_audio_init(void)
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static int __init snd_usb_audio_init(void)
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{
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{
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if (nrpacks < 1 || nrpacks > MAX_PACKS) {
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printk(KERN_WARNING "invalid nrpacks value.\n");
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return -EINVAL;
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}
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return usb_register(&usb_audio_driver);
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return usb_register(&usb_audio_driver);
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}
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}
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@ -2,11 +2,11 @@
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#define __USBAUDIO_CARD_H
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#define __USBAUDIO_CARD_H
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#define MAX_NR_RATES 1024
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#define MAX_NR_RATES 1024
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#define MAX_PACKS 20
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#define MAX_PACKS 6 /* per URB */
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#define MAX_PACKS_HS (MAX_PACKS * 8) /* in high speed mode */
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#define MAX_PACKS_HS (MAX_PACKS * 8) /* in high speed mode */
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#define MAX_URBS 8
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#define MAX_URBS 12
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#define SYNC_URBS 4 /* always four urbs for sync */
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#define SYNC_URBS 4 /* always four urbs for sync */
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#define MAX_QUEUE 24 /* try not to exceed this queue length, in ms */
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#define MAX_QUEUE 18 /* try not to exceed this queue length, in ms */
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struct audioformat {
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struct audioformat {
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struct list_head list;
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struct list_head list;
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@ -87,6 +87,7 @@ struct snd_usb_endpoint {
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unsigned int phase; /* phase accumulator */
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unsigned int phase; /* phase accumulator */
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unsigned int maxpacksize; /* max packet size in bytes */
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unsigned int maxpacksize; /* max packet size in bytes */
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unsigned int maxframesize; /* max packet size in frames */
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unsigned int maxframesize; /* max packet size in frames */
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unsigned int max_urb_frames; /* max URB size in frames */
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unsigned int curpacksize; /* current packet size in bytes (for capture) */
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unsigned int curpacksize; /* current packet size in bytes (for capture) */
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unsigned int curframesize; /* current packet size in frames (for capture) */
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unsigned int curframesize; /* current packet size in frames (for capture) */
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unsigned int syncmaxsize; /* sync endpoint packet size */
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unsigned int syncmaxsize; /* sync endpoint packet size */
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@ -116,6 +117,8 @@ struct snd_usb_substream {
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unsigned int channels_max; /* max channels in the all audiofmts */
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unsigned int channels_max; /* max channels in the all audiofmts */
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unsigned int cur_rate; /* current rate (for hw_params callback) */
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unsigned int cur_rate; /* current rate (for hw_params callback) */
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unsigned int period_bytes; /* current period bytes (for hw_params callback) */
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unsigned int period_bytes; /* current period bytes (for hw_params callback) */
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unsigned int period_frames; /* current frames per period */
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unsigned int buffer_periods; /* current periods per buffer */
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unsigned int altset_idx; /* USB data format: index of alternate setting */
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unsigned int altset_idx; /* USB data format: index of alternate setting */
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unsigned int txfr_quirk:1; /* allow sub-frame alignment */
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unsigned int txfr_quirk:1; /* allow sub-frame alignment */
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unsigned int fmt_type; /* USB audio format type (1-3) */
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unsigned int fmt_type; /* USB audio format type (1-3) */
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@ -125,6 +128,7 @@ struct snd_usb_substream {
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unsigned int hwptr_done; /* processed byte position in the buffer */
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unsigned int hwptr_done; /* processed byte position in the buffer */
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unsigned int transfer_done; /* processed frames since last period update */
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unsigned int transfer_done; /* processed frames since last period update */
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unsigned int frame_limit; /* limits number of packets in URB */
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/* data and sync endpoints for this stream */
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/* data and sync endpoints for this stream */
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unsigned int ep_num; /* the endpoint number */
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unsigned int ep_num; /* the endpoint number */
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@ -574,11 +574,14 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,
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snd_pcm_format_t pcm_format,
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snd_pcm_format_t pcm_format,
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unsigned int channels,
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unsigned int channels,
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unsigned int period_bytes,
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unsigned int period_bytes,
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unsigned int frames_per_period,
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unsigned int periods_per_buffer,
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struct audioformat *fmt,
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struct audioformat *fmt,
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struct snd_usb_endpoint *sync_ep)
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struct snd_usb_endpoint *sync_ep)
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{
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{
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unsigned int maxsize, i, urb_packs, total_packs, packs_per_ms;
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unsigned int maxsize, minsize, packs_per_ms, max_packs_per_urb;
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int is_playback = usb_pipeout(ep->pipe);
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unsigned int max_packs_per_period, urbs_per_period, urb_packs;
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unsigned int max_urbs, i;
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int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels;
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int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels;
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if (pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) {
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if (pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) {
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@ -611,58 +614,67 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,
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else
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else
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ep->curpacksize = maxsize;
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ep->curpacksize = maxsize;
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if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL)
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if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) {
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packs_per_ms = 8 >> ep->datainterval;
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packs_per_ms = 8 >> ep->datainterval;
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else
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max_packs_per_urb = MAX_PACKS_HS;
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packs_per_ms = 1;
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if (is_playback && !snd_usb_endpoint_implicit_feedback_sink(ep)) {
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urb_packs = max(ep->chip->nrpacks, 1);
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urb_packs = min(urb_packs, (unsigned int) MAX_PACKS);
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} else {
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} else {
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urb_packs = 1;
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packs_per_ms = 1;
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max_packs_per_urb = MAX_PACKS;
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}
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}
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urb_packs *= packs_per_ms;
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if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep))
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if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep))
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urb_packs = min(urb_packs, 1U << sync_ep->syncinterval);
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max_packs_per_urb = min(max_packs_per_urb,
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1U << sync_ep->syncinterval);
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max_packs_per_urb = max(1u, max_packs_per_urb >> ep->datainterval);
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/* decide how many packets to be used */
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/*
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if (is_playback && !snd_usb_endpoint_implicit_feedback_sink(ep)) {
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* Capture endpoints need to use small URBs because there's no way
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unsigned int minsize, maxpacks;
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* to tell in advance where the next period will end, and we don't
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* want the next URB to complete much after the period ends.
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*
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* Playback endpoints with implicit sync much use the same parameters
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* as their corresponding capture endpoint.
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*/
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if (usb_pipein(ep->pipe) ||
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snd_usb_endpoint_implicit_feedback_sink(ep)) {
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/* make capture URBs <= 1 ms and smaller than a period */
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urb_packs = min(max_packs_per_urb, packs_per_ms);
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while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
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urb_packs >>= 1;
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ep->nurbs = MAX_URBS;
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/*
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* Playback endpoints without implicit sync are adjusted so that
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* a period fits as evenly as possible in the smallest number of
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* URBs. The total number of URBs is adjusted to the size of the
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* ALSA buffer, subject to the MAX_URBS and MAX_QUEUE limits.
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*/
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} else {
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/* determine how small a packet can be */
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/* determine how small a packet can be */
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minsize = (ep->freqn >> (16 - ep->datainterval))
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minsize = (ep->freqn >> (16 - ep->datainterval)) *
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* (frame_bits >> 3);
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(frame_bits >> 3);
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/* with sync from device, assume it can be 12% lower */
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/* with sync from device, assume it can be 12% lower */
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if (sync_ep)
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if (sync_ep)
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minsize -= minsize >> 3;
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minsize -= minsize >> 3;
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minsize = max(minsize, 1u);
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minsize = max(minsize, 1u);
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total_packs = (period_bytes + minsize - 1) / minsize;
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/* we need at least two URBs for queueing */
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if (total_packs < 2) {
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total_packs = 2;
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} else {
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/* and we don't want too long a queue either */
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maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2);
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total_packs = min(total_packs, maxpacks);
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}
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} else {
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while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
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urb_packs >>= 1;
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total_packs = MAX_URBS * urb_packs;
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}
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ep->nurbs = (total_packs + urb_packs - 1) / urb_packs;
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/* how many packets will contain an entire ALSA period? */
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if (ep->nurbs > MAX_URBS) {
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max_packs_per_period = DIV_ROUND_UP(period_bytes, minsize);
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/* too much... */
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ep->nurbs = MAX_URBS;
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/* how many URBs will contain a period? */
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total_packs = MAX_URBS * urb_packs;
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urbs_per_period = DIV_ROUND_UP(max_packs_per_period,
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} else if (ep->nurbs < 2) {
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max_packs_per_urb);
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/* too little - we need at least two packets
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/* how many packets are needed in each URB? */
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* to ensure contiguous playback/capture
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urb_packs = DIV_ROUND_UP(max_packs_per_period, urbs_per_period);
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*/
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ep->nurbs = 2;
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/* limit the number of frames in a single URB */
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ep->max_urb_frames = DIV_ROUND_UP(frames_per_period,
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urbs_per_period);
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/* try to use enough URBs to contain an entire ALSA buffer */
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max_urbs = min((unsigned) MAX_URBS,
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MAX_QUEUE * packs_per_ms / urb_packs);
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ep->nurbs = min(max_urbs, urbs_per_period * periods_per_buffer);
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}
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}
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/* allocate and initialize data urbs */
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/* allocate and initialize data urbs */
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struct snd_urb_ctx *u = &ep->urb[i];
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struct snd_urb_ctx *u = &ep->urb[i];
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u->index = i;
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u->index = i;
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u->ep = ep;
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u->ep = ep;
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u->packets = (i + 1) * total_packs / ep->nurbs
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u->packets = urb_packs;
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- i * total_packs / ep->nurbs;
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u->buffer_size = maxsize * u->packets;
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u->buffer_size = maxsize * u->packets;
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if (fmt->fmt_type == UAC_FORMAT_TYPE_II)
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if (fmt->fmt_type == UAC_FORMAT_TYPE_II)
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* @pcm_format: the audio fomat.
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* @pcm_format: the audio fomat.
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* @channels: the number of audio channels.
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* @channels: the number of audio channels.
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* @period_bytes: the number of bytes in one alsa period.
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* @period_bytes: the number of bytes in one alsa period.
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* @period_frames: the number of frames in one alsa period.
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* @buffer_periods: the number of periods in one alsa buffer.
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* @rate: the frame rate.
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* @rate: the frame rate.
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* @fmt: the USB audio format information
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* @fmt: the USB audio format information
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* @sync_ep: the sync endpoint to use, if any
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* @sync_ep: the sync endpoint to use, if any
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snd_pcm_format_t pcm_format,
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snd_pcm_format_t pcm_format,
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unsigned int channels,
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unsigned int channels,
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unsigned int period_bytes,
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unsigned int period_bytes,
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unsigned int period_frames,
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unsigned int buffer_periods,
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unsigned int rate,
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unsigned int rate,
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struct audioformat *fmt,
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struct audioformat *fmt,
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struct snd_usb_endpoint *sync_ep)
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struct snd_usb_endpoint *sync_ep)
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@ -793,7 +808,8 @@ int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
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switch (ep->type) {
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switch (ep->type) {
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case SND_USB_ENDPOINT_TYPE_DATA:
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case SND_USB_ENDPOINT_TYPE_DATA:
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err = data_ep_set_params(ep, pcm_format, channels,
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err = data_ep_set_params(ep, pcm_format, channels,
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period_bytes, fmt, sync_ep);
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period_bytes, period_frames,
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buffer_periods, fmt, sync_ep);
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break;
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break;
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case SND_USB_ENDPOINT_TYPE_SYNC:
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case SND_USB_ENDPOINT_TYPE_SYNC:
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err = sync_ep_set_params(ep, fmt);
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err = sync_ep_set_params(ep, fmt);
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@ -12,6 +12,8 @@ int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
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snd_pcm_format_t pcm_format,
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snd_pcm_format_t pcm_format,
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unsigned int channels,
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unsigned int channels,
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unsigned int period_bytes,
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unsigned int period_bytes,
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unsigned int period_frames,
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unsigned int buffer_periods,
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unsigned int rate,
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unsigned int rate,
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struct audioformat *fmt,
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struct audioformat *fmt,
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struct snd_usb_endpoint *sync_ep);
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struct snd_usb_endpoint *sync_ep);
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@ -595,6 +595,7 @@ static int configure_sync_endpoint(struct snd_usb_substream *subs)
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subs->pcm_format,
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subs->pcm_format,
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subs->channels,
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subs->channels,
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subs->period_bytes,
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subs->period_bytes,
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0, 0,
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subs->cur_rate,
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subs->cur_rate,
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subs->cur_audiofmt,
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subs->cur_audiofmt,
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NULL);
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NULL);
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@ -631,6 +632,7 @@ static int configure_sync_endpoint(struct snd_usb_substream *subs)
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subs->pcm_format,
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subs->pcm_format,
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sync_fp->channels,
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sync_fp->channels,
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sync_period_bytes,
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sync_period_bytes,
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0, 0,
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subs->cur_rate,
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subs->cur_rate,
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sync_fp,
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sync_fp,
|
||||||
NULL);
|
NULL);
|
||||||
|
@ -653,6 +655,8 @@ static int configure_endpoint(struct snd_usb_substream *subs)
|
||||||
subs->pcm_format,
|
subs->pcm_format,
|
||||||
subs->channels,
|
subs->channels,
|
||||||
subs->period_bytes,
|
subs->period_bytes,
|
||||||
|
subs->period_frames,
|
||||||
|
subs->buffer_periods,
|
||||||
subs->cur_rate,
|
subs->cur_rate,
|
||||||
subs->cur_audiofmt,
|
subs->cur_audiofmt,
|
||||||
subs->sync_endpoint);
|
subs->sync_endpoint);
|
||||||
|
@ -689,6 +693,8 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream,
|
||||||
|
|
||||||
subs->pcm_format = params_format(hw_params);
|
subs->pcm_format = params_format(hw_params);
|
||||||
subs->period_bytes = params_period_bytes(hw_params);
|
subs->period_bytes = params_period_bytes(hw_params);
|
||||||
|
subs->period_frames = params_period_size(hw_params);
|
||||||
|
subs->buffer_periods = params_periods(hw_params);
|
||||||
subs->channels = params_channels(hw_params);
|
subs->channels = params_channels(hw_params);
|
||||||
subs->cur_rate = params_rate(hw_params);
|
subs->cur_rate = params_rate(hw_params);
|
||||||
|
|
||||||
|
@ -1363,6 +1369,7 @@ static void prepare_playback_urb(struct snd_usb_substream *subs,
|
||||||
frames = 0;
|
frames = 0;
|
||||||
urb->number_of_packets = 0;
|
urb->number_of_packets = 0;
|
||||||
spin_lock_irqsave(&subs->lock, flags);
|
spin_lock_irqsave(&subs->lock, flags);
|
||||||
|
subs->frame_limit += ep->max_urb_frames;
|
||||||
for (i = 0; i < ctx->packets; i++) {
|
for (i = 0; i < ctx->packets; i++) {
|
||||||
if (ctx->packet_size[i])
|
if (ctx->packet_size[i])
|
||||||
counts = ctx->packet_size[i];
|
counts = ctx->packet_size[i];
|
||||||
|
@ -1377,6 +1384,7 @@ static void prepare_playback_urb(struct snd_usb_substream *subs,
|
||||||
subs->transfer_done += counts;
|
subs->transfer_done += counts;
|
||||||
if (subs->transfer_done >= runtime->period_size) {
|
if (subs->transfer_done >= runtime->period_size) {
|
||||||
subs->transfer_done -= runtime->period_size;
|
subs->transfer_done -= runtime->period_size;
|
||||||
|
subs->frame_limit = 0;
|
||||||
period_elapsed = 1;
|
period_elapsed = 1;
|
||||||
if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
|
if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
|
||||||
if (subs->transfer_done > 0) {
|
if (subs->transfer_done > 0) {
|
||||||
|
@ -1399,8 +1407,10 @@ static void prepare_playback_urb(struct snd_usb_substream *subs,
|
||||||
break;
|
break;
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
if (period_elapsed &&
|
/* finish at the period boundary or after enough frames */
|
||||||
!snd_usb_endpoint_implicit_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
|
if ((period_elapsed ||
|
||||||
|
subs->transfer_done >= subs->frame_limit) &&
|
||||||
|
!snd_usb_endpoint_implicit_feedback_sink(ep))
|
||||||
break;
|
break;
|
||||||
}
|
}
|
||||||
bytes = frames * ep->stride;
|
bytes = frames * ep->stride;
|
||||||
|
|
|
@ -55,7 +55,6 @@ struct snd_usb_audio {
|
||||||
struct list_head mixer_list; /* list of mixer interfaces */
|
struct list_head mixer_list; /* list of mixer interfaces */
|
||||||
|
|
||||||
int setup; /* from the 'device_setup' module param */
|
int setup; /* from the 'device_setup' module param */
|
||||||
int nrpacks; /* from the 'nrpacks' module param */
|
|
||||||
bool autoclock; /* from the 'autoclock' module param */
|
bool autoclock; /* from the 'autoclock' module param */
|
||||||
|
|
||||||
struct usb_host_interface *ctrl_intf; /* the audio control interface */
|
struct usb_host_interface *ctrl_intf; /* the audio control interface */
|
||||||
|
|
Loading…
Reference in a new issue