ALSA: usb: stream: refactor uac3 audio interface parsing
Offload snd_usb_parse_audio_interface() function which became quite long after adding UAC3 spec support. Move class-specific parts of uac3 parsing to separate function which now produce audioformat structure that is ready to be fed to snd_usb_add_audio_stream(). Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Ruslan Bilovol
Takashi Iwai
parent
68faa86364
commit
eda553f432
1 changed files with 146 additions and 143 deletions
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@ -807,19 +807,154 @@ snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
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return fp;
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}
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static struct audioformat *
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snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,
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struct usb_host_interface *alts,
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int iface_no, int altset_idx,
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int altno, int stream)
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{
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struct usb_device *dev = chip->dev;
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struct uac3_input_terminal_descriptor *input_term;
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struct uac3_output_terminal_descriptor *output_term;
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struct uac3_cluster_header_descriptor *cluster;
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struct uac3_as_header_descriptor *as;
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struct uac3_hc_descriptor_header hc_header;
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struct snd_pcm_chmap_elem *chmap;
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unsigned int num_channels;
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struct audioformat *fp;
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u16 cluster_id, wLength;
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int clock = 0;
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int err;
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as = snd_usb_find_csint_desc(alts->extra, alts->extralen,
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NULL, UAC_AS_GENERAL);
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if (!as) {
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dev_err(&dev->dev,
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"%u:%d : UAC_AS_GENERAL descriptor not found\n",
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iface_no, altno);
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return NULL;
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}
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if (as->bLength < sizeof(*as)) {
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dev_err(&dev->dev,
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"%u:%d : invalid UAC_AS_GENERAL desc\n",
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iface_no, altno);
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return NULL;
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}
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cluster_id = le16_to_cpu(as->wClusterDescrID);
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if (!cluster_id) {
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dev_err(&dev->dev,
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"%u:%d : no cluster descriptor\n",
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iface_no, altno);
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return NULL;
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}
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/*
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* Get number of channels and channel map through
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* High Capability Cluster Descriptor
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*
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* First step: get High Capability header and
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* read size of Cluster Descriptor
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*/
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err = snd_usb_ctl_msg(chip->dev,
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usb_rcvctrlpipe(chip->dev, 0),
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UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
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USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
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cluster_id,
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snd_usb_ctrl_intf(chip),
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&hc_header, sizeof(hc_header));
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if (err < 0)
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return ERR_PTR(err);
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else if (err != sizeof(hc_header)) {
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dev_err(&dev->dev,
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"%u:%d : can't get High Capability descriptor\n",
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iface_no, altno);
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return ERR_PTR(-EIO);
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}
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/*
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* Second step: allocate needed amount of memory
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* and request Cluster Descriptor
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*/
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wLength = le16_to_cpu(hc_header.wLength);
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cluster = kzalloc(wLength, GFP_KERNEL);
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if (!cluster)
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return ERR_PTR(-ENOMEM);
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err = snd_usb_ctl_msg(chip->dev,
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usb_rcvctrlpipe(chip->dev, 0),
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UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
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USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
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cluster_id,
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snd_usb_ctrl_intf(chip),
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cluster, wLength);
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if (err < 0) {
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kfree(cluster);
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return ERR_PTR(err);
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} else if (err != wLength) {
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dev_err(&dev->dev,
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"%u:%d : can't get Cluster Descriptor\n",
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iface_no, altno);
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kfree(cluster);
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return ERR_PTR(-EIO);
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}
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num_channels = cluster->bNrChannels;
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chmap = convert_chmap_v3(cluster);
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kfree(cluster);
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/*
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* lookup the terminal associated to this interface
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* to extract the clock
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*/
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input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
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as->bTerminalLink);
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if (input_term) {
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clock = input_term->bCSourceID;
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goto found_clock;
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}
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output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
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as->bTerminalLink);
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if (output_term) {
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clock = output_term->bCSourceID;
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goto found_clock;
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}
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dev_err(&dev->dev, "%u:%d : bogus bTerminalLink %d\n",
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iface_no, altno, as->bTerminalLink);
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return NULL;
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found_clock:
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fp = audio_format_alloc_init(chip, alts, UAC_VERSION_3, iface_no,
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altset_idx, altno, num_channels, clock);
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if (!fp)
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return ERR_PTR(-ENOMEM);
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fp->attributes = parse_uac_endpoint_attributes(chip, alts,
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UAC_VERSION_3,
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iface_no);
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fp->chmap = chmap;
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/* ok, let's parse further... */
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if (snd_usb_parse_audio_format_v3(chip, fp, as, stream) < 0) {
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kfree(fp->rate_table);
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kfree(fp);
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return NULL;
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}
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return fp;
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}
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int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
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{
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struct usb_device *dev;
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struct usb_interface *iface;
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struct usb_host_interface *alts;
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struct usb_interface_descriptor *altsd;
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struct uac3_as_header_descriptor *as = NULL;
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int i, altno, err, stream;
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u64 format = 0;
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unsigned int num_channels = 0;
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struct audioformat *fp = NULL;
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int num, protocol, clock = 0;
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struct snd_pcm_chmap_elem *chmap_v3 = NULL;
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int num, protocol;
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dev = chip->dev;
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@ -900,149 +1035,17 @@ int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
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stream, bm_quirk);
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break;
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}
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case UAC_VERSION_3: {
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struct uac3_input_terminal_descriptor *input_term;
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struct uac3_output_terminal_descriptor *output_term;
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struct uac3_cluster_header_descriptor *cluster;
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struct uac3_hc_descriptor_header hc_header;
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u16 cluster_id, wLength;
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as = snd_usb_find_csint_desc(alts->extra,
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alts->extralen,
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NULL, UAC_AS_GENERAL);
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if (!as) {
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dev_err(&dev->dev,
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"%u:%d : UAC_AS_GENERAL descriptor not found\n",
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iface_no, altno);
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continue;
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}
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if (as->bLength < sizeof(*as)) {
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dev_err(&dev->dev,
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"%u:%d : invalid UAC_AS_GENERAL desc\n",
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iface_no, altno);
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continue;
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}
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cluster_id = le16_to_cpu(as->wClusterDescrID);
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if (!cluster_id) {
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dev_err(&dev->dev,
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"%u:%d : no cluster descriptor\n",
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iface_no, altno);
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continue;
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}
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/*
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* Get number of channels and channel map through
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* High Capability Cluster Descriptor
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*
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* First step: get High Capability header and
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* read size of Cluster Descriptor
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*/
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err = snd_usb_ctl_msg(chip->dev,
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usb_rcvctrlpipe(chip->dev, 0),
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UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
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USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
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cluster_id,
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snd_usb_ctrl_intf(chip),
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&hc_header, sizeof(hc_header));
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if (err < 0)
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return err;
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else if (err != sizeof(hc_header)) {
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dev_err(&dev->dev,
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"%u:%d : can't get High Capability descriptor\n",
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iface_no, altno);
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return -EIO;
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}
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/*
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* Second step: allocate needed amount of memory
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* and request Cluster Descriptor
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*/
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wLength = le16_to_cpu(hc_header.wLength);
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cluster = kzalloc(wLength, GFP_KERNEL);
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if (!cluster)
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return -ENOMEM;
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err = snd_usb_ctl_msg(chip->dev,
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usb_rcvctrlpipe(chip->dev, 0),
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UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
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USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
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cluster_id,
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snd_usb_ctrl_intf(chip),
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cluster, wLength);
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if (err < 0) {
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kfree(cluster);
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return err;
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} else if (err != wLength) {
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dev_err(&dev->dev,
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"%u:%d : can't get Cluster Descriptor\n",
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iface_no, altno);
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kfree(cluster);
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return -EIO;
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}
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num_channels = cluster->bNrChannels;
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chmap_v3 = convert_chmap_v3(cluster);
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kfree(cluster);
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format = le64_to_cpu(as->bmFormats);
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/* lookup the terminal associated to this interface
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* to extract the clock */
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input_term = snd_usb_find_input_terminal_descriptor(
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chip->ctrl_intf,
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as->bTerminalLink);
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if (input_term) {
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clock = input_term->bCSourceID;
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break;
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}
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output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
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as->bTerminalLink);
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if (output_term) {
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clock = output_term->bCSourceID;
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break;
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}
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dev_err(&dev->dev,
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"%u:%d : bogus bTerminalLink %d\n",
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iface_no, altno, as->bTerminalLink);
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continue;
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}
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case UAC_VERSION_3:
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fp = snd_usb_get_audioformat_uac3(chip, alts,
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iface_no, i, altno, stream);
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break;
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}
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if (protocol == UAC_VERSION_1 || protocol == UAC_VERSION_2) {
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if (!fp)
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continue;
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else if (IS_ERR(fp))
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return PTR_ERR(fp);
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goto skip_uac3;
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}
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fp = audio_format_alloc_init(chip, alts, protocol, iface_no, i,
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altno, num_channels, clock);
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if (!fp)
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return -ENOMEM;
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fp->attributes = parse_uac_endpoint_attributes(chip, alts,
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protocol,
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iface_no);
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fp->chmap = chmap_v3;
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/* ok, let's parse further... */
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if (snd_usb_parse_audio_format_v3(chip, fp, as,
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stream) < 0) {
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kfree(fp->rate_table);
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kfree(fp);
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fp = NULL;
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continue;
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}
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else if (IS_ERR(fp))
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return PTR_ERR(fp);
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skip_uac3:
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dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
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err = snd_usb_add_audio_stream(chip, stream, fp);
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if (err < 0) {
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