bluez5: add ldac codec

spa/meson.build

@@ -28,6 +28,7 @@ if get_option('spa-plugins')
   if get_option('bluez5')
     bluez_dep = dependency('bluez', version : '>= 4.101')
     sbc_dep = dependency('sbc')
+    ldac_dep = dependency('ldacBT-enc', required : false)
   endif
   if get_option('ffmpeg')
     avcodec_dep = dependency('libavcodec')

spa/plugins/bluez5/a2dp-codec-ldac.c

+/* Spa A2DP LDAC codec
+ *
+ * Copyright © 2020 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <unistd.h>
+#include <stddef.h>
+#include <errno.h>
+#include <arpa/inet.h>
+
+#include <spa/param/audio/format.h>
+
+#include <ldacBT.h>
+
+#include "defs.h"
+#include "rtp.h"
+#include "a2dp-codecs.h"
+
+#define MAX_FRAME_COUNT 16
+
+struct impl {
+	HANDLE_LDAC_BT ldac;
+
+	struct rtp_header *header;
+	struct rtp_payload *payload;
+
+	int mtu;
+	int eqmid;
+	int channel_mode;
+	int frequency;
+	int fmt;
+	int lsu;
+	int codesize;
+	int frame_length;
+};
+
+static int codec_fill_caps(uint32_t flags, uint8_t caps[A2DP_MAX_CAPS_SIZE])
+{
+	const a2dp_ldac_t a2dp_ldac = {
+		.info.vendor_id = LDAC_VENDOR_ID,
+		.info.codec_id = LDAC_CODEC_ID,
+		.frequency = LDACBT_SAMPLING_FREQ_044100 |
+			LDACBT_SAMPLING_FREQ_048000 |
+			LDACBT_SAMPLING_FREQ_088200 |
+			LDACBT_SAMPLING_FREQ_096000 |
+			LDACBT_SAMPLING_FREQ_176400 |
+			LDACBT_SAMPLING_FREQ_192000,
+		.channel_mode = LDACBT_CHANNEL_MODE_MONO |
+			LDACBT_CHANNEL_MODE_DUAL_CHANNEL |
+			LDACBT_CHANNEL_MODE_STEREO,
+	};
+	memcpy(caps, &a2dp_ldac, sizeof(a2dp_ldac));
+	return sizeof(a2dp_ldac);
+}
+
+static int codec_select_config(uint32_t flags, const void *caps, size_t caps_size,
+			const struct spa_audio_info *info, uint8_t config[A2DP_MAX_CAPS_SIZE])
+{
+	a2dp_ldac_t conf;
+
+        if (caps_size < sizeof(conf))
+                return -EINVAL;
+
+	memcpy(&conf, caps, sizeof(conf));
+	conf.info.vendor_id = LDAC_VENDOR_ID;
+	conf.info.codec_id = LDAC_CODEC_ID;
+
+	if (conf.frequency & LDACBT_SAMPLING_FREQ_044100)
+		conf.frequency = LDACBT_SAMPLING_FREQ_044100;
+	if (conf.frequency & LDACBT_SAMPLING_FREQ_048000)
+		conf.frequency = LDACBT_SAMPLING_FREQ_048000;
+	if (conf.frequency & LDACBT_SAMPLING_FREQ_088200)
+		conf.frequency = LDACBT_SAMPLING_FREQ_088200;
+	if (conf.frequency & LDACBT_SAMPLING_FREQ_096000)
+		conf.frequency = LDACBT_SAMPLING_FREQ_096000;
+	if (conf.frequency & LDACBT_SAMPLING_FREQ_176400)
+		conf.frequency = LDACBT_SAMPLING_FREQ_176400;
+	if (conf.frequency & LDACBT_SAMPLING_FREQ_192000)
+		conf.frequency = LDACBT_SAMPLING_FREQ_192000;
+	else
+		return -ENOTSUP;
+
+	if (conf.channel_mode & LDACBT_CHANNEL_MODE_STEREO)
+		conf.channel_mode = LDACBT_CHANNEL_MODE_STEREO;
+        else if (conf.channel_mode & LDACBT_CHANNEL_MODE_DUAL_CHANNEL)
+		conf.channel_mode = LDACBT_CHANNEL_MODE_DUAL_CHANNEL;
+        else if (conf.channel_mode & LDACBT_CHANNEL_MODE_MONO)
+		conf.channel_mode = LDACBT_CHANNEL_MODE_MONO;
+	else
+		return -ENOTSUP;
+
+	memcpy(config, &conf, sizeof(conf));
+
+        return sizeof(conf);
+}
+
+static int codec_reduce_bitpool(void *data)
+{
+	struct impl *this = data;
+	return ldacBT_alter_eqmid_priority(this->ldac, LDACBT_EQMID_INC_CONNECTION);
+}
+
+static int codec_increase_bitpool(void *data)
+{
+	struct impl *this = data;
+	return ldacBT_alter_eqmid_priority(this->ldac, LDACBT_EQMID_INC_QUALITY);
+}
+
+static int codec_get_num_blocks(void *data, size_t mtu)
+{
+	struct impl *this = data;
+	size_t rtp_size = sizeof(struct rtp_header) + sizeof(struct rtp_payload);
+	size_t frame_count = (mtu - rtp_size) / this->frame_length;
+
+	/* frame_count is only 4 bit number */
+	if (frame_count > 15)
+		frame_count = 15;
+	return frame_count;
+}
+
+static int codec_get_block_size(void *data)
+{
+	struct impl *this = data;
+	return this->codesize;
+}
+
+static void *codec_init(uint32_t flags, void *config, size_t config_len, struct spa_audio_info *info)
+{
+	struct impl *this;
+	a2dp_ldac_t *conf = config;
+	int res;
+
+	this = calloc(1, sizeof(struct impl));
+	if (this == NULL)
+		goto error_errno;
+
+	this->ldac = ldacBT_get_handle();
+	if (this->ldac == NULL)
+		goto error_errno;
+
+	this->eqmid = LDACBT_EQMID_SQ;
+
+	spa_zero(*info);
+	info->media_type = SPA_MEDIA_TYPE_audio;
+	info->media_subtype = SPA_MEDIA_SUBTYPE_raw;
+	info->info.raw.format = SPA_AUDIO_FORMAT_S16;
+	this->fmt = LDACBT_SMPL_FMT_S16;
+
+	switch(conf->frequency) {
+	case LDACBT_SAMPLING_FREQ_044100:
+		info->info.raw.rate = 44100;
+		this->lsu = 128;
+		break;
+	case LDACBT_SAMPLING_FREQ_048000:
+		info->info.raw.rate = 48000;
+		this->lsu = 128;
+		break;
+	case LDACBT_SAMPLING_FREQ_088200:
+		info->info.raw.rate = 88200;
+		this->lsu = 256;
+		break;
+	case LDACBT_SAMPLING_FREQ_096000:
+		info->info.raw.rate = 96000;
+		this->lsu = 256;
+		break;
+	case LDACBT_SAMPLING_FREQ_176400:
+		info->info.raw.rate = 176400;
+		this->lsu = 512;
+		break;
+	case LDACBT_SAMPLING_FREQ_192000:
+		info->info.raw.rate = 192000;
+		this->lsu = 512;
+		break;
+	default:
+		res = -EINVAL;
+		goto error;
+	}
+	this->frequency = info->info.raw.rate;
+
+	switch(conf->channel_mode) {
+	case LDACBT_CHANNEL_MODE_STEREO:
+		info->info.raw.channels = 2;
+		break;
+	case LDACBT_CHANNEL_MODE_DUAL_CHANNEL:
+		info->info.raw.channels = 2;
+		break;
+	case LDACBT_CHANNEL_MODE_MONO:
+		info->info.raw.channels = 1;
+		break;
+	default:
+		res = -EINVAL;
+		goto error;
+	}
+	this->channel_mode = conf->channel_mode;
+
+	switch (this->eqmid) {
+	case LDACBT_EQMID_HQ:
+		this->frame_length = 330;
+		break;
+	case LDACBT_EQMID_SQ:
+		this->frame_length = 220;
+		break;
+	case LDACBT_EQMID_MQ:
+		this->frame_length = 110;
+		break;
+	default:
+		res = -EINVAL;
+		goto error;
+	}
+
+	res = ldacBT_init_handle_encode(this->ldac,
+			this->mtu,
+			this->eqmid,
+			this->channel_mode,
+			this->fmt,
+			this->frequency);
+	if (res < 0)
+		goto error;
+
+	this->codesize = this->lsu * info->info.raw.channels * 2;
+
+	return this;
+
+error_errno:
+	res = -errno;
+error:
+	free(this);
+	errno = -res;
+	return NULL;
+}
+
+static void codec_deinit(void *data)
+{
+	struct impl *this = data;
+	if (this->ldac)
+		ldacBT_free_handle(this->ldac);
+	free(this);
+}
+
+static int codec_start_encode (void *data,
+		void *dst, size_t dst_size, uint16_t seqnum, uint32_t timestamp)
+{
+	struct impl *this = data;
+
+	this->header = (struct rtp_header *)dst;
+	this->payload = SPA_MEMBER(dst, sizeof(struct rtp_header), struct rtp_payload);
+	memset(this->header, 0, sizeof(struct rtp_header)+sizeof(struct rtp_payload));
+
+	this->payload->frame_count = 0;
+	this->header->v = 2;
+	this->header->pt = 1;
+	this->header->sequence_number = htons(seqnum);
+	this->header->timestamp = htonl(timestamp);
+	this->header->ssrc = htonl(1);
+	return sizeof(struct rtp_header) + sizeof(struct rtp_payload);
+}
+
+static int codec_encode(void *data,
+		const void *src, size_t src_size,
+		void *dst, size_t dst_size,
+		size_t *dst_out)
+{
+	struct impl *this = data;
+	int res, src_used, dst_used, frame_num = 0;
+
+	src_used = src_size;
+	dst_used = dst_size;
+
+	res = ldacBT_encode(this->ldac, (void*)src, &src_used, dst, &dst_used, &frame_num);
+	if (res < 0)
+		return -EINVAL;
+
+	*dst_out = dst_used;
+
+	this->payload->frame_count += frame_num;
+
+	return src_used;
+}
+
+struct a2dp_codec a2dp_codec_ldac = {
+	.id = {.codec_id = A2DP_CODEC_VENDOR,
+		.vendor_id = LDAC_VENDOR_ID,
+		.vendor_codec_id = LDAC_CODEC_ID },
+	.name = "ldac",
+	.description = "LDAC",
+	.fill_caps = codec_fill_caps,
+	.select_config = codec_select_config,
+	.init = codec_init,
+	.deinit = codec_deinit,
+	.get_block_size = codec_get_block_size,
+	.get_num_blocks = codec_get_num_blocks,
+	.start_encode = codec_start_encode,
+	.encode = codec_encode,
+	.reduce_bitpool = codec_reduce_bitpool,
+	.increase_bitpool = codec_increase_bitpool,
+};

spa/plugins/bluez5/a2dp-codecs.c

@@ -69,6 +69,9 @@ const a2dp_aptx_t bluez_a2dp_aptx = {
 #endif
 
 extern struct a2dp_codec a2dp_codec_sbc;
+#if ENABLE_LDAC
+extern struct a2dp_codec a2dp_codec_ldac;
+#endif
 #if ENABLE_AAC
 extern struct a2dp_codec a2dp_codec_aac;
 #endif
@@ -81,6 +84,9 @@ extern struct a2dp_codec a2dp_codec_aptx;
 
 const struct a2dp_codec *a2dp_codec_list[] = {
 	&a2dp_codec_sbc,
+#if ENABLE_LDAC
+	&a2dp_codec_ldac,
+#endif
 #if ENABLE_AAC
 	&a2dp_codec_aac,
 #endif

spa/plugins/bluez5/a2dp-codecs.h

@@ -176,6 +176,12 @@ typedef struct {
 	uint16_t codec_id;
 } __attribute__ ((packed)) a2dp_vendor_codec_t;
 
+typedef struct {
+	a2dp_vendor_codec_t info;
+	uint8_t frequency;
+	uint8_t channel_mode;
+} __attribute__ ((packed)) a2dp_ldac_t;
+
 #if __BYTE_ORDER == __LITTLE_ENDIAN
 
 typedef struct {
@@ -216,11 +222,6 @@ typedef struct {
 	uint8_t frequency:4;
 } __attribute__ ((packed)) a2dp_aptx_t;
 
-typedef struct {
-	a2dp_vendor_codec_t info;
-	uint8_t unknown[2];
-} __attribute__ ((packed)) a2dp_ldac_t;
-
 #elif __BYTE_ORDER == __BIG_ENDIAN
 
 typedef struct {
@@ -268,14 +269,6 @@ typedef struct {
 	uint32_t rfa;
 } __attribute__ ((packed)) a2dp_aptx_hd_t;
 
-typedef struct {
-	a2dp_vendor_codec_t info;
-	uint8_t rfa1:2;
-	uint8_t frequency:6;
-	uint8_t rfa2:5;
-	uint8_t channel_mode:3;
-} __attribute__ ((packed)) a2dp_ldac_t;
-
 
 #else
 #error "Unknown byte order"

spa/plugins/bluez5/bluez5-dbus.c

@@ -1331,6 +1331,7 @@ static DBusHandlerResult object_manager_handler(DBusConnection *c, DBusMessage *
 			if (caps_size < 0)
 				continue;
 
+			spa_log_info(monitor->log, "register A2DP codec %s", a2dp_codecs[i]->name);
 			endpoint = spa_aprintf("%s/%s", A2DP_SINK_ENDPOINT, codec->name);
 			append_a2dp_object(&array, endpoint, SPA_BT_UUID_A2DP_SINK, codec_id, caps, caps_size);
 			free(endpoint);

spa/plugins/bluez5/meson.build

@@ -10,6 +10,15 @@ bluez5_sources = ['plugin.c',
 		  'bluez5-device.c',
 		  'bluez5-dbus.c']
 
+bluez5_args = [ '-D_GNU_SOURCE' ]
+bluez5_deps = [ dbus_dep, sbc_dep, bluez_dep ]
+
+if ldac_dep.found()
+  bluez5_sources += [ 'a2dp-codec-ldac.c' ]
+  bluez5_args += [ '-DENABLE_LDAC' ]
+  bluez5_deps += ldac_dep
+endif
+
 if get_option('bluez5-backend-native')
   bluez5_sources += ['backend-hsp-native.c']
 endif
@@ -25,7 +34,7 @@ endif
 bluez5lib = shared_library('spa-bluez5',
 	bluez5_sources,
 	include_directories : [ spa_inc, configinc ],
-	c_args : [ '-D_GNU_SOURCE' ],
-	dependencies : [ dbus_dep, sbc_dep, bluez_dep ],
+	c_args : bluez5_args,
+	dependencies : bluez5_deps,
 	install : true,
         install_dir : join_paths(spa_plugindir, 'bluez5'))

[tinywrkb]

Is it this https://github.com/EHfive/ldacBT ?

[Wim Taymans]

yes, looks like it. it's the one in fedora, so..

[tinywrkb]

Thanks, I updated the maintainer of the pipewire-git AUR package so this will be updated on Arch Linux.