diff options
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/usb/card.h | 2 | ||||
| -rw-r--r-- | sound/usb/pcm.c | 134 |
2 files changed, 76 insertions, 60 deletions
diff --git a/sound/usb/card.h b/sound/usb/card.h index 23b6f23..6cc883c 100644 --- a/sound/usb/card.h +++ b/sound/usb/card.h @@ -107,6 +107,8 @@ struct snd_usb_substream { int interface; /* current interface */ int endpoint; /* assigned endpoint */ struct audioformat *cur_audiofmt; /* current audioformat pointer (for hw_params callback) */ + snd_pcm_format_t pcm_format; /* current audio format (for hw_params callback) */ + unsigned int channels; /* current number of channels (for hw_params callback) */ unsigned int cur_rate; /* current rate (for hw_params callback) */ unsigned int period_bytes; /* current period bytes (for hw_params callback) */ unsigned int altset_idx; /* USB data format: index of alternate setting */ diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index 62ab4fd..ae783d4 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -82,8 +82,7 @@ static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream /* * find a matching audio format */ -static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned int format, - unsigned int rate, unsigned int channels) +static struct audioformat *find_format(struct snd_usb_substream *subs) { struct list_head *p; struct audioformat *found = NULL; @@ -92,16 +91,17 @@ static struct audioformat *find_format(struct snd_usb_substream *subs, unsigned list_for_each(p, &subs->fmt_list) { struct audioformat *fp; fp = list_entry(p, struct audioformat, list); - if (!(fp->formats & (1uLL << format))) + if (!(fp->formats & (1uLL << subs->pcm_format))) continue; - if (fp->channels != channels) + if (fp->channels != subs->channels) continue; - if (rate < fp->rate_min || rate > fp->rate_max) + if (subs->cur_rate < fp->rate_min || + subs->cur_rate > fp->rate_max) continue; if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) { unsigned int i; for (i = 0; i < fp->nr_rates; i++) - if (fp->rate_table[i] == rate) + if (fp->rate_table[i] == subs->cur_rate) break; if (i >= fp->nr_rates) continue; @@ -436,6 +436,42 @@ add_sync_ep: } /* + * configure endpoint params + * + * called during initial setup and upon resume + */ +static int configure_endpoint(struct snd_usb_substream *subs) +{ + int ret; + + mutex_lock(&subs->stream->chip->shutdown_mutex); + /* format changed */ + stop_endpoints(subs, 0, 0, 0); + ret = snd_usb_endpoint_set_params(subs->data_endpoint, + subs->pcm_format, + subs->channels, + subs->period_bytes, + subs->cur_rate, + subs->cur_audiofmt, + subs->sync_endpoint); + if (ret < 0) + goto unlock; + + if (subs->sync_endpoint) + ret = snd_usb_endpoint_set_params(subs->data_endpoint, + subs->pcm_format, + subs->channels, + subs->period_bytes, + subs->cur_rate, + subs->cur_audiofmt, + NULL); + +unlock: + mutex_unlock(&subs->stream->chip->shutdown_mutex); + return ret; +} + +/* * hw_params callback * * allocate a buffer and set the given audio format. @@ -450,75 +486,32 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream, { struct snd_usb_substream *subs = substream->runtime->private_data; struct audioformat *fmt; - unsigned int channels, rate, format; - int ret, changed; + int ret; ret = snd_pcm_lib_alloc_vmalloc_buffer(substream, params_buffer_bytes(hw_params)); if (ret < 0) return ret; - format = params_format(hw_params); - rate = params_rate(hw_params); - channels = params_channels(hw_params); - fmt = find_format(subs, format, rate, channels); + subs->pcm_format = params_format(hw_params); + subs->period_bytes = params_period_bytes(hw_params); + subs->channels = params_channels(hw_params); + subs->cur_rate = params_rate(hw_params); + + fmt = find_format(subs); if (!fmt) { snd_printd(KERN_DEBUG "cannot set format: format = %#x, rate = %d, channels = %d\n", - format, rate, channels); + subs->pcm_format, subs->cur_rate, subs->channels); return -EINVAL; } - changed = subs->cur_audiofmt != fmt || - subs->period_bytes != params_period_bytes(hw_params) || - subs->cur_rate != rate; if ((ret = set_format(subs, fmt)) < 0) return ret; - if (subs->cur_rate != rate) { - struct usb_host_interface *alts; - struct usb_interface *iface; - iface = usb_ifnum_to_if(subs->dev, fmt->iface); - alts = &iface->altsetting[fmt->altset_idx]; - ret = snd_usb_init_sample_rate(subs->stream->chip, fmt->iface, alts, fmt, rate); - if (ret < 0) - return ret; - subs->cur_rate = rate; - } - - if (changed) { - subs->period_bytes = params_period_bytes(hw_params); + subs->interface = fmt->iface; + subs->altset_idx = fmt->altset_idx; - mutex_lock(&subs->stream->chip->shutdown_mutex); - /* format changed */ - stop_endpoints(subs, 0, 0, 0); - ret = snd_usb_endpoint_set_params(subs->data_endpoint, - format, - channels, - subs->period_bytes, - rate, - fmt, - subs->sync_endpoint); - if (ret < 0) - goto unlock; - - if (subs->sync_endpoint) - ret = snd_usb_endpoint_set_params(subs->data_endpoint, - format, - channels, - subs->period_bytes, - rate, - fmt, - NULL); -unlock: - mutex_unlock(&subs->stream->chip->shutdown_mutex); - } - - if (ret == 0) { - subs->interface = fmt->iface; - subs->altset_idx = fmt->altset_idx; - } - - return ret; + return 0; } /* @@ -549,6 +542,9 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct snd_usb_substream *subs = runtime->private_data; + struct usb_host_interface *alts; + struct usb_interface *iface; + int ret; if (! subs->cur_audiofmt) { snd_printk(KERN_ERR "usbaudio: no format is specified!\n"); @@ -558,6 +554,24 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream) if (snd_BUG_ON(!subs->data_endpoint)) return -EIO; + ret = set_format(subs, subs->cur_audiofmt); + if (ret < 0) + return ret; + + iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface); + alts = &iface->altsetting[subs->cur_audiofmt->altset_idx]; + ret = snd_usb_init_sample_rate(subs->stream->chip, + subs->cur_audiofmt->iface, + alts, + subs->cur_audiofmt, + subs->cur_rate); + if (ret < 0) + return ret; + + ret = configure_endpoint(subs); + if (ret < 0) + return ret; + /* some unit conversions in runtime */ subs->data_endpoint->maxframesize = bytes_to_frames(runtime, subs->data_endpoint->maxpacksize); |
