diff options
| -rw-r--r-- | drivers/usb/gadget/function/f_uac2.c | 5 | ||||
| -rw-r--r-- | drivers/usb/gadget/function/u_audio.c | 96 |
2 files changed, 75 insertions, 26 deletions
diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c index dc5365c51f1e..f8923425b079 100644 --- a/drivers/usb/gadget/function/f_uac2.c +++ b/drivers/usb/gadget/function/f_uac2.c @@ -674,8 +674,9 @@ static int set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts, ssize = uac2_opts->c_ssize; } - if (!is_playback && (uac2_opts->c_sync == USB_ENDPOINT_SYNC_ASYNC)) { - // Win10 requires max packet size + 1 frame + if (is_playback || (uac2_opts->c_sync == USB_ENDPOINT_SYNC_ASYNC)) { + // playback is always async, capture only when configured + // Win10 requires max packet size + 1 frame srate = srate * (1000 + uac2_opts->fb_max) / 1000; // updated srate is always bigger, therefore DIV_ROUND_UP always yields +1 max_size_bw = num_channels(chmask) * ssize * diff --git a/drivers/usb/gadget/function/u_audio.c b/drivers/usb/gadget/function/u_audio.c index ad16163b5ff8..c46400be5464 100644 --- a/drivers/usb/gadget/function/u_audio.c +++ b/drivers/usb/gadget/function/u_audio.c @@ -29,6 +29,7 @@ enum { UAC_FBACK_CTRL, + UAC_P_PITCH_CTRL, UAC_MUTE_CTRL, UAC_VOLUME_CTRL, }; @@ -74,13 +75,9 @@ struct snd_uac_chip { struct snd_card *card; struct snd_pcm *pcm; - /* timekeeping for the playback endpoint */ - unsigned int p_interval; - unsigned int p_residue; - /* pre-calculated values for playback iso completion */ - unsigned int p_pktsize; - unsigned int p_pktsize_residue; + unsigned long long p_interval_mil; + unsigned long long p_residue_mil; unsigned int p_framesize; }; @@ -153,6 +150,11 @@ static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req) struct snd_pcm_runtime *runtime; struct uac_rtd_params *prm = req->context; struct snd_uac_chip *uac = prm->uac; + struct g_audio *audio_dev = uac->audio_dev; + struct uac_params *params = &audio_dev->params; + unsigned int frames, p_pktsize; + unsigned long long pitched_rate_mil, p_pktsize_residue_mil, + residue_frames_mil, div_result; /* i/f shutting down */ if (!prm->ep_enabled) { @@ -192,19 +194,42 @@ static void u_audio_iso_complete(struct usb_ep *ep, struct usb_request *req) * If there is a residue from this division, add it to the * residue accumulator. */ - req->length = uac->p_pktsize; - uac->p_residue += uac->p_pktsize_residue; + pitched_rate_mil = (unsigned long long) + params->p_srate * prm->pitch; + div_result = pitched_rate_mil; + do_div(div_result, uac->p_interval_mil); + frames = (unsigned int) div_result; + + pr_debug("p_srate %d, pitch %d, interval_mil %llu, frames %d\n", + params->p_srate, prm->pitch, uac->p_interval_mil, frames); + + p_pktsize = min_t(unsigned int, + uac->p_framesize * frames, + ep->maxpacket); + + if (p_pktsize < ep->maxpacket) { + residue_frames_mil = pitched_rate_mil - frames * uac->p_interval_mil; + p_pktsize_residue_mil = uac->p_framesize * residue_frames_mil; + } else + p_pktsize_residue_mil = 0; + + req->length = p_pktsize; + uac->p_residue_mil += p_pktsize_residue_mil; /* - * Whenever there are more bytes in the accumulator than we + * Whenever there are more bytes in the accumulator p_residue_mil than we * need to add one more sample frame, increase this packet's * size and decrease the accumulator. */ - if (uac->p_residue / uac->p_interval >= uac->p_framesize) { + div_result = uac->p_residue_mil; + do_div(div_result, uac->p_interval_mil); + if ((unsigned int) div_result >= uac->p_framesize) { req->length += uac->p_framesize; - uac->p_residue -= uac->p_framesize * - uac->p_interval; + uac->p_residue_mil -= uac->p_framesize * + uac->p_interval_mil; + pr_debug("increased req length to %d\n", req->length); } + pr_debug("remains uac->p_residue_mil %llu\n", uac->p_residue_mil); req->actual = req->length; } @@ -371,7 +396,7 @@ static int uac_pcm_open(struct snd_pcm_substream *substream) c_srate = params->c_srate; p_chmask = params->p_chmask; c_chmask = params->c_chmask; - uac->p_residue = 0; + uac->p_residue_mil = 0; runtime->hw = uac_pcm_hardware; @@ -566,12 +591,17 @@ int u_audio_start_playback(struct g_audio *audio_dev) unsigned int factor; const struct usb_endpoint_descriptor *ep_desc; int req_len, i; + unsigned int p_interval, p_pktsize; ep = audio_dev->in_ep; prm = &uac->p_prm; config_ep_by_speed(gadget, &audio_dev->func, ep); ep_desc = ep->desc; + /* + * Always start with original frequency + */ + prm->pitch = 1000000; /* pre-calculate the playback endpoint's interval */ if (gadget->speed == USB_SPEED_FULL) @@ -582,20 +612,15 @@ int u_audio_start_playback(struct g_audio *audio_dev) /* pre-compute some values for iso_complete() */ uac->p_framesize = params->p_ssize * num_channels(params->p_chmask); - uac->p_interval = factor / (1 << (ep_desc->bInterval - 1)); - uac->p_pktsize = min_t(unsigned int, + p_interval = factor / (1 << (ep_desc->bInterval - 1)); + uac->p_interval_mil = (unsigned long long) p_interval * 1000000; + p_pktsize = min_t(unsigned int, uac->p_framesize * - (params->p_srate / uac->p_interval), + (params->p_srate / p_interval), ep->maxpacket); - if (uac->p_pktsize < ep->maxpacket) - uac->p_pktsize_residue = uac->p_framesize * - (params->p_srate % uac->p_interval); - else - uac->p_pktsize_residue = 0; - - req_len = uac->p_pktsize; - uac->p_residue = 0; + req_len = p_pktsize; + uac->p_residue_mil = 0; prm->ep_enabled = true; usb_ep_enable(ep); @@ -925,6 +950,13 @@ static struct snd_kcontrol_new u_audio_controls[] = { .get = u_audio_pitch_get, .put = u_audio_pitch_put, }, + [UAC_P_PITCH_CTRL] { + .iface = SNDRV_CTL_ELEM_IFACE_PCM, + .name = "Playback Pitch 1000000", + .info = u_audio_pitch_info, + .get = u_audio_pitch_get, + .put = u_audio_pitch_put, + }, [UAC_MUTE_CTRL] { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "", /* will be filled later */ @@ -1062,6 +1094,22 @@ int g_audio_setup(struct g_audio *g_audio, const char *pcm_name, goto snd_fail; } + if (p_chmask) { + kctl = snd_ctl_new1(&u_audio_controls[UAC_P_PITCH_CTRL], + &uac->p_prm); + if (!kctl) { + err = -ENOMEM; + goto snd_fail; + } + + kctl->id.device = pcm->device; + kctl->id.subdevice = 0; + + err = snd_ctl_add(card, kctl); + if (err < 0) + goto snd_fail; + } + for (i = 0; i <= SNDRV_PCM_STREAM_LAST; i++) { struct uac_rtd_params *prm; struct uac_fu_params *fu; |