btmon: Add support for decoding Basic Audio Annoucements

This adds support for decoding Basic Audio Announcements as shown
on:

Basic Audio Profile / Profile Specification
Page 36 of 146

Table 3.15: Format of BASE used in Basic Audio Announcements

< HCI Command: LE Set Periodic Advertising Data (0x08|0x003f) plen 36
        Handle: 0
        Operation: Complete ext advertising data (0x03)
        Data length: 0x21
        Service Data: Basic Audio Announcement (0x1851)
          Presetation Delay: 40000
          Number of Subgroups: 1
            Subgroup #0:
            Number of BIS(s): 1
            Codec: Reserved (0x06)
            Codec Specific Configuration: 010101020403010000020428
            Metadata: 020202
              BIS #0:
              Index: 1
              Codec Specific Configuration:

Signed-off-by: Manika Shrivastava <manika.sh@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>

diff --git a/monitor/bt.h b/monitor/bt.h
index 6a4e160..f9a17f4 100755 (executable)
--- a/monitor/bt.h
+++ b/monitor/bt.h
@@ -3516,6 +3516,34 @@ struct bt_hci_evt_le_per_sync_established {
        uint8_t  clock_accuracy;
 } __attribute__ ((packed));
 
+struct bt_hci_le_pa_base_codec {
+       uint8_t  id;
+       uint16_t cid;
+       uint16_t vid;
+} __attribute__ ((packed));
+
+struct bt_hci_lv_data {
+       uint8_t  len;
+       uint8_t  data[];
+} __attribute__ ((packed));
+
+struct bt_hci_le_pa_base_bis {
+       uint8_t  index;
+       struct bt_hci_lv_data codec_cfg[];
+} __attribute__ ((packed));
+
+struct bt_hci_le_pa_base_subgroup {
+       uint8_t  num_bis;
+       struct bt_hci_le_pa_base_codec codec;
+       uint8_t  data[];
+} __attribute__ ((packed));
+
+struct bt_hci_le_pa_base_data {
+       uint8_t  pd[3];
+       uint8_t  num_subgroups;
+       struct bt_hci_le_pa_base_subgroup subgroups[];
+} __attribute__ ((packed));
+
 #define BT_HCI_EVT_LE_PA_REPORT                        0x0f
 struct bt_hci_le_pa_report {
        uint16_t handle;

diff --git a/monitor/packet.c b/monitor/packet.c
index 619553e..61a5df3 100755 (executable)
--- a/monitor/packet.c
+++ b/monitor/packet.c
@@ -3300,6 +3300,111 @@ static void print_uuid128_list(const char *label, const void *data,
        }
 }
 
+static void *iov_pull(struct iovec *iov, size_t len)
+{
+       void *data;
+
+       if (iov->iov_len < len)
+               return NULL;
+
+       data = iov->iov_base;
+       iov->iov_base += len;
+       iov->iov_len -= len;
+
+       return data;
+}
+
+static void print_base_annoucement(const uint8_t *data, uint8_t data_len)
+{
+       struct iovec iov;
+       struct bt_hci_le_pa_base_data *base_data;
+       uint8_t i;
+
+       iov.iov_base = (void *) data;
+       iov.iov_len = data_len;
+
+       base_data = iov_pull(&iov, sizeof(*base_data));
+       if (!base_data)
+               goto done;
+
+       /* Level 1 - BASE */
+       print_field("  Presetation Delay: %u", get_le24(base_data->pd));
+       print_field("  Number of Subgroups: %u", base_data->num_subgroups);
+
+       /* Level 2 - Subgroups*/
+       for (i = 0; i < base_data->num_subgroups; i++) {
+               struct bt_hci_le_pa_base_subgroup *subgroup;
+               struct bt_hci_lv_data *codec_cfg;
+               struct bt_hci_lv_data *metadata;
+               uint8_t j;
+
+               print_field("    Subgroup #%u:", i);
+
+               subgroup = iov_pull(&iov, sizeof(*subgroup));
+               if (!subgroup)
+                       goto done;
+
+               print_field("    Number of BIS(s): %u", subgroup->num_bis);
+               print_codec_id("    Codec", subgroup->codec.id);
+
+               if (subgroup->codec.id == 0xff) {
+                       uint16_t id;
+
+                       id = le16_to_cpu(subgroup->codec.vid);
+                       print_field("    Codec Company ID: %s (0x%04x)",
+                                               bt_compidtostr(id), id);
+                       print_field("    Codec Vendor ID: 0x%04x",
+                                               subgroup->codec.vid);
+               }
+
+               codec_cfg = iov_pull(&iov, sizeof(*codec_cfg));
+               if (!codec_cfg)
+                       goto done;
+
+               if (!iov_pull(&iov, codec_cfg->len))
+                       goto done;
+
+               print_hex_field("    Codec Specific Configuration",
+                                       codec_cfg->data, codec_cfg->len);
+
+               metadata = iov_pull(&iov, sizeof(*metadata));
+               if (!metadata)
+                       goto done;
+
+               if (!iov_pull(&iov, metadata->len))
+                       goto done;
+
+               print_hex_field("    Metadata", metadata->data, metadata->len);
+
+               /* Level 3 - BIS(s)*/
+               for (j = 0; j < subgroup->num_bis; j++) {
+                       struct bt_hci_le_pa_base_bis *bis;
+
+                       print_field("      BIS #%u:", j);
+
+                       bis = iov_pull(&iov, sizeof(*bis));
+                       if (!bis)
+                               goto done;
+
+                       print_field("      Index: %u", bis->index);
+
+                       codec_cfg = iov_pull(&iov, sizeof(*codec_cfg));
+                       if (!codec_cfg)
+                               goto done;
+
+                       if (!iov_pull(&iov, codec_cfg->len))
+                               goto done;
+
+                       print_hex_field("      Codec Specific Configuration",
+                                       codec_cfg->data, codec_cfg->len);
+               }
+       }
+
+done:
+       if (iov.iov_len)
+               print_hex_field("  Data", iov.iov_base, iov.iov_len);
+}
+
 static void print_broadcast_annoucement(const uint8_t *data, uint8_t data_len)
 {
        uint32_t bid;
@@ -3317,6 +3422,7 @@ static const struct service_data_decoder {
        uint16_t uuid;
        void (*func)(const uint8_t *data, uint8_t data_len);
 } service_data_decoders[] = {
+       { 0x1851, print_base_annoucement },
        { 0x1852, print_broadcast_annoucement }
 };