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From: Andrei Istodorescu <andrei.istodorescu@nxp.com>
To: luiz.dentz@gmail.com
Cc: andrei.istodorescu@nxp.com,
	iulia.tanasescu@nxp.com,
	linux-bluetooth@vger.kernel.org,
	mihai-octavian.urzica@nxp.com,
	silviu.barbulescu@nxp.com,
	vlad.pruteanu@nxp.com
Subject: Re: [PATCH BlueZ v4 1/2] shared/bap: Add API to add an observed BIS
Date: Wed, 28 Feb 2024 17:12:27 +0200
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Hi Luiz,

I have fixed all the comments excepting one. Please see inline.

> -----Original Message-----
> From: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
> Sent: Tuesday, February 27, 2024 4:39 PM
> To: Andrei Istodorescu <andrei.istodorescu@nxp.com>
> Cc: linux-bluetooth@vger.kernel.org; Mihai-Octavian Urzica <mihai-
> octavian.urzica@nxp.com>; Silviu Florian Barbulescu
> <silviu.barbulescu@nxp.com>; Vlad Pruteanu <vlad.pruteanu@nxp.com>;
> Iulia Tanasescu <iulia.tanasescu@nxp.com>
> Subject: Re: [PATCH BlueZ v4 1/2] shared/bap: Add API to add an
> observed BIS
> 
> Caution: This is an external email. Please take care when clicking links or
> opening attachments. When in doubt, report the message using the 'Report
> this email' button
> 
> 
> Hi Andrei,
> 
> On Fri, Feb 23, 2024 at 10:34 AM Andrei Istodorescu
> <andrei.istodorescu@nxp.com> wrote:
> >
> > Add API to add a PAC for each observed BIS that is supported by the
> > local PACS data.
> > Each BIS observed capabilities LTV is compared to the local
> > capabilities and when we have a full LTVs match a PAC record is created for
> that BIS.
> > Also a MediaEndpoint is registered over DBUS and the stream can be
> > enabled using the SetConfiguration DBUS call.
> > ---
> >  src/shared/bap.c | 304
> > ++++++++++++++++++++++++++++++++++++++++++++---
> >  src/shared/bap.h |  13 +-
> >  2 files changed, 302 insertions(+), 15 deletions(-)
> >
> > diff --git a/src/shared/bap.c b/src/shared/bap.c index
> > f5fc1402701c..853919111835 100644
> > --- a/src/shared/bap.c
> > +++ b/src/shared/bap.c
> > @@ -48,6 +48,15 @@
> >
> >  #define BAP_PROCESS_TIMEOUT 10
> >
> > +#define BAP_FREQ_LTV_TYPE 1
> > +#define BAP_DURATION_LTV_TYPE 2
> > +#define BAP_CHANNEL_ALLOCATION_LTV_TYPE 3 #define
> > +BAP_FRAME_LEN_LTV_TYPE 4 #define
> CODEC_SPECIFIC_CONFIGURATION_MASK (\
> > +               (1<<BAP_FREQ_LTV_TYPE)|\
> > +               (1<<BAP_DURATION_LTV_TYPE)|\
> > +               (1<<BAP_FRAME_LEN_LTV_TYPE))
> > +
> >  struct bt_bap_pac_changed {
> >         unsigned int id;
> >         bt_bap_pac_func_t added;
> > @@ -1692,11 +1701,8 @@ static unsigned int bap_bcast_config(struct
> bt_bap_stream *stream,
> >                                      bt_bap_stream_func_t func, void
> > *user_data)  {
> >         stream->qos = *qos;
> > -       if (stream->lpac->type == BT_BAP_BCAST_SINK) {
> > -               if (data)
> > -                       stream_config(stream, data, NULL);
> > -               stream_set_state(stream, BT_BAP_STREAM_STATE_CONFIG);
> > -       }
> > +       stream->lpac->ops->config(stream, stream->cc, &stream->qos,
> > +                       ep_config_cb, stream->lpac->user_data);
> >
> >         return 1;
> >  }
> > @@ -3302,6 +3308,13 @@ static void bap_add_broadcast_source(struct
> > bt_bap_pac *pac)  static void bap_add_broadcast_sink(struct bt_bap_pac
> > *pac)  {
> >         queue_push_tail(pac->bdb->broadcast_sinks, pac);
> > +
> > +       /* Update local PACS for broadcast sink also, when registering an
> > +        * endpoint
> > +        */
> > +       pacs_add_sink_location(pac->bdb->pacs, pac->qos.location);
> > +       pacs_add_sink_supported_context(pac->bdb->pacs,
> > +                       pac->qos.supported_context);
> >  }
> >
> >  static void notify_pac_added(void *data, void *user_data) @@ -3453,6
> > +3466,16 @@ struct bt_bap_pac_qos *bt_bap_pac_get_qos(struct
> bt_bap_pac *pac)
> >         return &pac->qos;
> >  }
> >
> > +struct iovec *bt_bap_pac_get_data(struct bt_bap_pac *pac) {
> > +       return pac->data;
> > +}
> > +
> > +struct iovec *bt_bap_pac_get_metadata(struct bt_bap_pac *pac) {
> > +       return pac->metadata;
> > +}
> > +
> >  uint8_t bt_bap_stream_get_type(struct bt_bap_stream *stream)  {
> >         if (!stream)
> > @@ -5253,10 +5276,6 @@ bool bt_bap_stream_set_user_data(struct
> > bt_bap_stream *stream, void *user_data)
> >
> >         stream->user_data = user_data;
> >
> > -       if (bt_bap_stream_get_type(stream) ==
> BT_BAP_STREAM_TYPE_BCAST)
> > -               stream->lpac->ops->config(stream, stream->cc, &stream->qos,
> > -                                       ep_config_cb, stream->lpac->user_data);
> > -
> >         return true;
> >  }
> >
> > @@ -5892,8 +5911,9 @@ static void add_new_subgroup(struct bt_base
> > *base,
> >
> >  struct bt_ltv_match {
> >         uint8_t l;
> > -       uint8_t *v;
> > +       void *data;
> >         bool found;
> > +       uint32_t data32;
> >  };
> >
> >  struct bt_ltv_search {
> > @@ -5912,7 +5932,7 @@ static void match_ltv(size_t i, uint8_t l, uint8_t t,
> uint8_t *v,
> >         if (ltv_match->l != l)
> >                 return;
> >
> > -       if (!memcmp(v, ltv_match->v, l))
> > +       if (!memcmp(v, ltv_match->data, l))
> >                 ltv_match->found = true;  }
> >
> > @@ -5924,7 +5944,7 @@ static void search_ltv(size_t i, uint8_t l,
> > uint8_t t, uint8_t *v,
> >
> >         ltv_match.found = false;
> >         ltv_match.l = l;
> > -       ltv_match.v = v;
> > +       ltv_match.data = v;
> >
> >         util_ltv_foreach(ltv_search->iov->iov_base,
> >                         ltv_search->iov->iov_len, &t, @@ -5965,8
> > +5985,10 @@ static bool compare_ltv(struct iovec *iov1,  }
> >
> >  struct bt_ltv_extract {
> > -       struct iovec *result;
> >         struct iovec *src;
> > +       void *value;
> > +       uint8_t len;
> > +       struct iovec *result;
> >  };
> >
> >  static void extract_ltv(size_t i, uint8_t l, uint8_t t, uint8_t *v,
> > @@ -5978,7 +6000,7 @@ static void extract_ltv(size_t i, uint8_t l,
> > uint8_t t, uint8_t *v,
> >
> >         ltv_match.found = false;
> >         ltv_match.l = l;
> > -       ltv_match.v = v;
> > +       ltv_match.data = v;
> >
> >         /* Search each BIS caps ltv in subgroup caps
> >          * to extract the one that are BIS specific @@ -6111,3
> > +6133,257 @@ struct iovec *bt_bap_stream_get_base(struct
> bt_bap_stream
> > *stream)
> >
> >         return base_iov;
> >  }
> > +
> > +static void bap_sink_get_allocation(size_t i, uint8_t l, uint8_t t,
> > +               uint8_t *v, void *user_data) {
> > +       uint32_t location32;
> > +
> > +       if (!v)
> > +               return;
> > +
> > +       memcpy(&location32, v, l);
> > +       *((uint32_t *)user_data) = le32_to_cpu(location32); }
> > +
> > +/*
> > + * This function compares PAC Codec Specific Capabilities, with the
> > +Codec
> > + * Specific Configuration LTVs received in the BASE of the BAP
> > +Source. The
> > + * result is accumulated in data32 which is a bitmask of types.
> > + */
> > +static void check_pac_caps_ltv(size_t i, uint8_t l, uint8_t t, uint8_t *v,
> > +                                       void *user_data) {
> > +       struct bt_ltv_match *compare_data = user_data;
> > +       uint8_t *bis_v = compare_data->data;
> > +
> > +       switch (t) {
> > +       case BAP_FREQ_LTV_TYPE:
> > +       {
> > +               uint16_t mask = *((uint16_t *)v);
> > +
> > +               mask = le16_to_cpu(mask);
> > +               if (mask & (1 << (bis_v[0] - 1)))
> > +                       compare_data->data32 |= 1<<t;
> > +       }
> > +       break;
> > +       case BAP_DURATION_LTV_TYPE:
> > +               if ((v[0]) & (1 << bis_v[0]))
> > +                       compare_data->data32 |= 1<<t;
> > +               break;
> > +       case BAP_FRAME_LEN_LTV_TYPE:
> > +       {
> > +               uint16_t min = *((uint16_t *)v);
> > +               uint16_t max = *((uint16_t *)(&v[2]));
> > +               uint16_t frame_len = *((uint16_t *)bis_v);
> > +
> > +               min = le16_to_cpu(min);
> > +               max = le16_to_cpu(max);
> > +               frame_len = le16_to_cpu(frame_len);
> > +               if ((frame_len >= min) &&
> > +                               (frame_len <= max))
> > +                       compare_data->data32 |= 1<<t;
> > +       }
> 
> Don't create new scopes inside a switch statement, that makes it hard to
> follow the code, if you really think that would help have a helper function to
> check each field.
> 
> > +       break;
> > +       }
> > +}
> > +
> > +static void check_source_ltv(size_t i, uint8_t l, uint8_t t, uint8_t *v,
> > +                                       void *user_data) {
> > +       struct bt_ltv_match *local_data = user_data;
> > +       struct iovec *pac_caps = local_data->data;
> > +       struct bt_ltv_match compare_data;
> > +
> > +       compare_data.data = v;
> > +
> > +       /* Search inside local PAC's caps for LTV of type t */
> > +       util_ltv_foreach(pac_caps->iov_base, pac_caps->iov_len, &t,
> > +                                       check_pac_caps_ltv,
> > + &compare_data);
> > +
> > +       local_data->data32 |= compare_data.data32; }
> > +
> > +static void bap_sink_check_level3_ltv(size_t i, uint8_t l, uint8_t t,
> > +               uint8_t *v, void *user_data) {
> > +       struct bt_ltv_extract *merge_data = user_data;
> > +
> > +       merge_data->value = v;
> > +       merge_data->len = l;
> > +}
> > +
> > +static void bap_push_ltv(struct iovec *output, uint8_t l, uint8_t t,
> > +void *v) {
> > +       l++;
> > +       iov_append(output, 1, &l);
> > +       iov_append(output, 1, &t);
> > +       iov_append(output, l - 1, v);
> > +}
> 
> Perhaps we should create a helper function to do this sort of thing, maybe
> util_ltv_push?
> 
> > +static void bap_sink_check_level2_ltv(size_t i, uint8_t l, uint8_t t,
> > +               uint8_t *v, void *user_data) {
> > +       struct bt_ltv_extract *merge_data = user_data;
> > +
> > +       merge_data->value = NULL;
> > +       util_ltv_foreach(merge_data->src->iov_base,
> > +                       merge_data->src->iov_len,
> > +                       &t,
> > +                       bap_sink_check_level3_ltv, user_data);
> > +
> > +       /* If the LTV at level 2 was found at level 3 add the one from level 3,
> > +        * otherwise add the one at level 2
> > +        */
> > +       if (merge_data->value)
> > +               bap_push_ltv(merge_data->result, merge_data->len,
> > +                               t, merge_data->value);
> > +       else
> > +               bap_push_ltv(merge_data->result, l, t, v); }
> > +
> > +static void check_local_pac(void *data, void *user_data) {
> > +       struct bt_ltv_match *compare_data = user_data;
> > +       struct iovec *bis_data = (struct iovec *)compare_data->data;
> > +       const struct bt_bap_pac *pac = data;
> > +
> > +       /* Keep searching for a matching PAC if one wasn't found
> > +        * in previous PAC element
> > +        */
> > +       if (compare_data->found == false) {
> > +               struct bt_ltv_match bis_compare_data = {
> > +                               .data = pac->data,
> > +                               .data32 = 0, /* LTVs bitmask result */
> > +                               .found = false
> > +               };
> > +
> > +               /* loop each BIS LTV */
> > +               util_ltv_foreach(bis_data->iov_base, bis_data->iov_len, NULL,
> > +                               check_source_ltv, &bis_compare_data);
> > +
> > +               /* We have a match if all selected LTVs have a match */
> > +               if ((bis_compare_data.data32 &
> > +                       CODEC_SPECIFIC_CONFIGURATION_MASK) ==
> > +                       CODEC_SPECIFIC_CONFIGURATION_MASK)
> > +                       compare_data->found = true;
> > +       }
> > +}
> > +
> > +static void bap_sink_match_allocation(size_t i, uint8_t l, uint8_t t,
> > +               uint8_t *v, void *user_data) {
> > +       struct bt_ltv_match *data = user_data;
> > +       uint32_t location32;
> > +
> > +       if (!v)
> > +               return;
> > +
> > +       memcpy(&location32, v, l);
> > +       location32 = le32_to_cpu(location32);
> > +
> > +       /* If all the bits in the received bitmask are found in
> > +        * the local bitmask then we have a match
> > +        */
> > +       if ((location32 & data->data32) == location32)
> > +               data->found = true;
> > +       else
> > +               data->found = false;
> > +}
> > +
> > +static bool bap_check_bis(struct bt_bap_db *ldb, struct iovec
> > +*bis_data) {
> > +       struct bt_ltv_match compare_data = {};
> > +
> > +       /* Check channel allocation against the PACS location.
> > +        * If we don't have a location set we can accept any BIS location.
> > +        * If the BIS doesn't have a location set we also accept it
> > +        */
> > +       compare_data.found = true;
> > +
> > +       if (ldb->pacs->sink_loc_value) {
> > +               uint8_t type = BAP_CHANNEL_ALLOCATION_LTV_TYPE;
> > +
> > +               compare_data.data32 = ldb->pacs->sink_loc_value;
> > +               util_ltv_foreach(bis_data->iov_base, bis_data->iov_len, &type,
> > +                               bap_sink_match_allocation, &compare_data);
> > +       }
> > +
> > +       /* Check remaining LTVs against the PACs list */
> > +       if (compare_data.found) {
> > +               compare_data.data = bis_data;
> > +               compare_data.found = false;
> > +               queue_foreach(ldb->broadcast_sinks, check_local_pac,
> > +                               &compare_data);
> > +       }
> > +
> > +       return compare_data.found;
> > +}
> > +
> > +void bt_bap_add_bis(struct bt_bap *bap, uint8_t bis_index,
> > +               struct bt_bap_codec *codec,
> > +               struct iovec *l2_caps,
> > +               struct iovec *l3_caps,
> > +               struct iovec *meta)
> > +{
> > +       struct bt_bap_pac *pac_source_bis;
> > +       struct bt_bap_endpoint *ep;
> > +       int err = 0;
> > +       struct bt_bap_pac_qos bis_qos = {0};
> > +       uint8_t type = 0;
> > +       struct bt_ltv_extract merge_data = {0};
> > +
> > +       merge_data.src = l3_caps;
> > +       merge_data.result = new0(struct iovec, 1);
> > +
> > +       /* Create a Codec Specific Configuration with LTVs at level 2 (subgroup)
> > +        * overwritten by LTVs at level 3 (BIS)
> > +        */
> > +       util_ltv_foreach(l2_caps->iov_base,
> > +                       l2_caps->iov_len,
> > +                       NULL,
> > +                       bap_sink_check_level2_ltv, &merge_data);
> > +
> > +       /* Check each BIS Codec Specific Configuration LTVs against our Codec
> > +        * Specific Capabilities and if the BIS matches create a PAC with it
> > +        */
> > +       if (bap_check_bis(bap->ldb, merge_data.result) == false)
> > +               goto cleanup;
> > +
> > +       DBG(bap, "Matching BIS %i", bis_index);
> > +
> > +       /* Create a QoS structure based on the received BIS information to
> > +        * specify the desired channel for this BIS/PAC
> > +        */
> > +       type = BAP_CHANNEL_ALLOCATION_LTV_TYPE;
> > +       util_ltv_foreach(merge_data.result->iov_base,
> > +                       merge_data.result->iov_len, &type,
> > +                       bap_sink_get_allocation, &bis_qos.location);
> 
> Isn't it better to parse this inline with the use of util_iov_pull_*?
> If you don't want to change the iovec passed, which shall be made a const if
> that is intention, then just create a dup and parse it.
merge_data.result is the concatenated list for Capabilities LTVs. We need to 
extract the value for the Allocation LTV so that we pass it to the stream qos.
I used util_ltv_foreach to easily access the ltv. Do you see another way? 
Maybe I didn't understand your comment.

> 
> > +       /* Create a remote PAC */
> > +       pac_source_bis = bap_pac_new(bap->rdb, NULL,
> > +                               BT_BAP_BCAST_SOURCE, codec, &bis_qos,
> > +                               merge_data.result, meta);
> > +
> > +       err = asprintf(&pac_source_bis->name, "%d", bis_index);
> > +
> > +       if (err < 0) {
> > +               DBG(bap, "error in asprintf");
> > +               goto cleanup;
> > +       }
> > +
> > +       /* Add remote source endpoint */
> > +       if (!bap->rdb->broadcast_sources)
> > +               bap->rdb->broadcast_sources = queue_new();
> > +       queue_push_tail(bap->rdb->broadcast_sources, pac_source_bis);
> > +
> > +       queue_foreach(bap->pac_cbs, notify_pac_added, pac_source_bis);
> > +       /* Push remote endpoint with direction sink */
> > +       ep = bap_endpoint_new_broadcast(bap->rdb, BT_BAP_BCAST_SINK);
> > +
> > +       if (ep)
> > +               queue_push_tail(bap->remote_eps, ep);
> > +
> > +cleanup:
> > +       util_iov_free(merge_data.result, 1); }
> > diff --git a/src/shared/bap.h b/src/shared/bap.h index
> > 2c3550921f07..b2826719f84f 100644
> > --- a/src/shared/bap.h
> > +++ b/src/shared/bap.h
> > @@ -4,7 +4,7 @@
> >   *  BlueZ - Bluetooth protocol stack for Linux
> >   *
> >   *  Copyright (C) 2022  Intel Corporation. All rights reserved.
> > - *  Copyright 2023 NXP
> > + *  Copyright 2023-2024 NXP
> >   *
> >   */
> >
> > @@ -175,6 +175,10 @@ uint16_t bt_bap_pac_get_context(struct
> bt_bap_pac
> > *pac);
> >
> >  struct bt_bap_pac_qos *bt_bap_pac_get_qos(struct bt_bap_pac *pac);
> >
> > +struct iovec *bt_bap_pac_get_data(struct bt_bap_pac *pac);
> > +
> > +struct iovec *bt_bap_pac_get_metadata(struct bt_bap_pac *pac);
> 
> Have these 2 functions above in a separate patch.
> 
> >  uint8_t bt_bap_stream_get_type(struct bt_bap_stream *stream);
> >
> >  struct bt_bap_stream *bt_bap_pac_get_stream(struct bt_bap_pac *pac);
> > @@ -323,3 +327,10 @@ void bt_bap_update_bcast_source(struct
> bt_bap_pac
> > *pac,  bool bt_bap_pac_bcast_is_local(struct bt_bap *bap, struct
> > bt_bap_pac *pac);
> >
> >  struct iovec *bt_bap_stream_get_base(struct bt_bap_stream *stream);
> > +
> > +void bt_bap_add_bis(struct bt_bap *bap, uint8_t bis_index,
> > +               struct bt_bap_codec *codec,
> > +               struct iovec *l2_caps,
> > +               struct iovec *l3_caps,
> > +               struct iovec *meta);
> > +
> > --
> > 2.40.1
> >
> 
> 
> --
> Luiz Augusto von Dentz

Regards,
Andrei