1 files changed, 790 insertions, 0 deletions

diff --git a/spa/plugins/bluez5/a2dp-codec-lc3plus.c b/spa/plugins/bluez5/a2dp-codec-lc3plus.c
new file mode 100644
index 0000000..2896624
--- /dev/null
+++ b/spa/plugins/bluez5/a2dp-codec-lc3plus.c
@@ -0,0 +1,790 @@
+/* Spa A2DP LC3plus HR codec
+ *
+ * Copyright © 2020 Wim Taymans
+ * Copyright © 2022 Pauli Virtanen
+ *
+ * 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>
+#if __BYTE_ORDER != __LITTLE_ENDIAN
+#include <byteswap.h>
+#endif
+
+#include <spa/param/audio/format.h>
+#include <spa/param/audio/format-utils.h>
+
+#ifdef HAVE_LC3PLUS_H
+#include <lc3plus.h>
+#else
+#include <lc3.h>
+#endif
+
+#include "rtp.h"
+#include "media-codecs.h"
+
+#define BITRATE_MIN 96000
+#define BITRATE_MAX 512000
+#define BITRATE_DEFAULT 160000
+
+struct dec_data {
+	int frame_size;
+	int fragment_size;
+	int fragment_count;
+	uint8_t fragment[LC3PLUS_MAX_BYTES];
+};
+
+struct enc_data {
+	struct rtp_header *header;
+	struct rtp_payload *payload;
+
+	int samples;
+	int codesize;
+
+	int packet_size;
+	int fragment_size;
+	int fragment_count;
+	void *fragment;
+
+	int bitrate;
+	int next_bitrate;
+};
+
+struct impl {
+	LC3PLUS_Enc *enc;
+	LC3PLUS_Dec *dec;
+
+	int mtu;
+	int samplerate;
+	int channels;
+	int frame_dms;
+	int bitrate;
+
+	struct dec_data d;
+	struct enc_data e;
+
+	int32_t buf[2][LC3PLUS_MAX_SAMPLES];
+};
+
+static int codec_fill_caps(const struct media_codec *codec, uint32_t flags,
+		uint8_t caps[A2DP_MAX_CAPS_SIZE])
+{
+	const a2dp_lc3plus_hr_t a2dp_lc3plus_hr = {
+		.info = codec->vendor,
+		LC3PLUS_HR_INIT_FRAME_DURATION(LC3PLUS_HR_FRAME_DURATION_10MS
+				| LC3PLUS_HR_FRAME_DURATION_5MS
+				| LC3PLUS_HR_FRAME_DURATION_2_5MS)
+		.channels = LC3PLUS_HR_CHANNELS_1 | LC3PLUS_HR_CHANNELS_2,
+		LC3PLUS_HR_INIT_FREQUENCY(LC3PLUS_HR_SAMPLING_FREQ_48000
+				| (lc3plus_samplerate_supported(96000) ? LC3PLUS_HR_SAMPLING_FREQ_96000 : 0))
+	};
+	memcpy(caps, &a2dp_lc3plus_hr, sizeof(a2dp_lc3plus_hr));
+	return sizeof(a2dp_lc3plus_hr);
+}
+
+static int codec_select_config(const struct media_codec *codec, uint32_t flags,
+		const void *caps, size_t caps_size,
+		const struct media_codec_audio_info *info,
+		const struct spa_dict *settings, uint8_t config[A2DP_MAX_CAPS_SIZE])
+{
+	a2dp_lc3plus_hr_t conf;
+
+	if (caps_size < sizeof(conf))
+		return -EINVAL;
+
+	memcpy(&conf, caps, sizeof(conf));
+
+	if (codec->vendor.vendor_id != conf.info.vendor_id ||
+	    codec->vendor.codec_id != conf.info.codec_id)
+		return -ENOTSUP;
+
+	if ((LC3PLUS_HR_GET_FREQUENCY(conf) & LC3PLUS_HR_SAMPLING_FREQ_48000)
+			&& lc3plus_samplerate_supported(48000))
+		LC3PLUS_HR_SET_FREQUENCY(conf, LC3PLUS_HR_SAMPLING_FREQ_48000);
+	else if ((LC3PLUS_HR_GET_FREQUENCY(conf) & LC3PLUS_HR_SAMPLING_FREQ_96000)
+			&& lc3plus_samplerate_supported(96000))
+		LC3PLUS_HR_SET_FREQUENCY(conf, LC3PLUS_HR_SAMPLING_FREQ_96000);
+	else
+		return -ENOTSUP;
+
+	if ((conf.channels & LC3PLUS_HR_CHANNELS_2) &&
+			lc3plus_channels_supported(2))
+		conf.channels = LC3PLUS_HR_CHANNELS_2;
+	else if ((conf.channels & LC3PLUS_HR_CHANNELS_1) &&
+			lc3plus_channels_supported(1))
+		conf.channels = LC3PLUS_HR_CHANNELS_1;
+	else
+		return -ENOTSUP;
+
+	if (LC3PLUS_HR_GET_FRAME_DURATION(conf) & LC3PLUS_HR_FRAME_DURATION_10MS)
+		LC3PLUS_HR_SET_FRAME_DURATION(conf, LC3PLUS_HR_FRAME_DURATION_10MS);
+	else if (LC3PLUS_HR_GET_FRAME_DURATION(conf) & LC3PLUS_HR_FRAME_DURATION_5MS)
+		LC3PLUS_HR_SET_FRAME_DURATION(conf, LC3PLUS_HR_FRAME_DURATION_5MS);
+	else if (LC3PLUS_HR_GET_FRAME_DURATION(conf) & LC3PLUS_HR_FRAME_DURATION_2_5MS)
+		LC3PLUS_HR_SET_FRAME_DURATION(conf, LC3PLUS_HR_FRAME_DURATION_2_5MS);
+	else
+		return -ENOTSUP;
+
+	memcpy(config, &conf, sizeof(conf));
+
+	return sizeof(conf);
+}
+
+static int codec_caps_preference_cmp(const struct media_codec *codec, uint32_t flags, const void *caps1, size_t caps1_size,
+		const void *caps2, size_t caps2_size, const struct media_codec_audio_info *info, const struct spa_dict *global_settings)
+{
+	a2dp_lc3plus_hr_t conf1, conf2;
+	a2dp_lc3plus_hr_t *conf;
+	int res1, res2;
+	int a, b;
+
+	/* Order selected configurations by preference */
+	res1 = codec->select_config(codec, 0, caps1, caps1_size, info, NULL, (uint8_t *)&conf1);
+	res2 = codec->select_config(codec, 0, caps2, caps2_size, info , NULL, (uint8_t *)&conf2);
+
+#define PREFER_EXPR(expr)			\
+		do {				\
+			conf = &conf1; 		\
+			a = (expr);		\
+			conf = &conf2;		\
+			b = (expr);		\
+			if (a != b)		\
+				return b - a;	\
+		} while (0)
+
+#define PREFER_BOOL(expr)	PREFER_EXPR((expr) ? 1 : 0)
+
+	/* Prefer valid */
+	a = (res1 > 0 && (size_t)res1 == sizeof(a2dp_lc3plus_hr_t)) ? 1 : 0;
+	b = (res2 > 0 && (size_t)res2 == sizeof(a2dp_lc3plus_hr_t)) ? 1 : 0;
+	if (!a || !b)
+		return b - a;
+
+	PREFER_BOOL(conf->channels & LC3PLUS_HR_CHANNELS_2);
+	PREFER_BOOL(LC3PLUS_HR_GET_FREQUENCY(*conf) & (LC3PLUS_HR_SAMPLING_FREQ_48000 | LC3PLUS_HR_SAMPLING_FREQ_96000));
+	PREFER_BOOL(LC3PLUS_HR_GET_FREQUENCY(*conf) & LC3PLUS_HR_SAMPLING_FREQ_48000);
+
+	return 0;
+
+#undef PREFER_EXPR
+#undef PREFER_BOOL
+}
+
+static int codec_enum_config(const struct media_codec *codec, uint32_t flags,
+		const void *caps, size_t caps_size, uint32_t id, uint32_t idx,
+		struct spa_pod_builder *b, struct spa_pod **param)
+{
+	a2dp_lc3plus_hr_t conf;
+	struct spa_pod_frame f[2];
+	struct spa_pod_choice *choice;
+	uint32_t position[SPA_AUDIO_MAX_CHANNELS];
+	uint32_t i = 0;
+
+	if (caps_size < sizeof(conf))
+		return -EINVAL;
+
+	memcpy(&conf, caps, sizeof(conf));
+
+	if (idx > 0)
+		return 0;
+
+	spa_pod_builder_push_object(b, &f[0], SPA_TYPE_OBJECT_Format, id);
+	spa_pod_builder_add(b,
+			SPA_FORMAT_mediaType,      SPA_POD_Id(SPA_MEDIA_TYPE_audio),
+			SPA_FORMAT_mediaSubtype,   SPA_POD_Id(SPA_MEDIA_SUBTYPE_raw),
+			SPA_FORMAT_AUDIO_format,   SPA_POD_Id(SPA_AUDIO_FORMAT_S24_32),
+			0);
+	spa_pod_builder_prop(b, SPA_FORMAT_AUDIO_rate, 0);
+
+	spa_pod_builder_push_choice(b, &f[1], SPA_CHOICE_None, 0);
+	choice = (struct spa_pod_choice*)spa_pod_builder_frame(b, &f[1]);
+	i = 0;
+	if ((LC3PLUS_HR_GET_FREQUENCY(conf) & LC3PLUS_HR_SAMPLING_FREQ_96000) &&
+			lc3plus_samplerate_supported(96000)) {
+		if (i++ == 0)
+			spa_pod_builder_int(b, 96000);
+		spa_pod_builder_int(b, 96000);
+	}
+	if ((LC3PLUS_HR_GET_FREQUENCY(conf) & LC3PLUS_HR_SAMPLING_FREQ_48000) &&
+			lc3plus_samplerate_supported(48000)) {
+		if (i++ == 0)
+			spa_pod_builder_int(b, 48000);
+		spa_pod_builder_int(b, 48000);
+	}
+	if (i == 0)
+		return -EINVAL;
+	if (i > 1)
+		choice->body.type = SPA_CHOICE_Enum;
+	spa_pod_builder_pop(b, &f[1]);
+
+	if ((conf.channels & (LC3PLUS_HR_CHANNELS_2 | LC3PLUS_HR_CHANNELS_1)) &&
+			lc3plus_channels_supported(2) && lc3plus_channels_supported(1)) {
+		spa_pod_builder_add(b,
+				SPA_FORMAT_AUDIO_channels, SPA_POD_CHOICE_RANGE_Int(2, 1, 2),
+				0);
+	} else if ((conf.channels & LC3PLUS_HR_CHANNELS_2) && lc3plus_channels_supported(2)) {
+		position[0] = SPA_AUDIO_CHANNEL_FL;
+		position[1] = SPA_AUDIO_CHANNEL_FR;
+		spa_pod_builder_add(b,
+				SPA_FORMAT_AUDIO_channels, SPA_POD_Int(2),
+				SPA_FORMAT_AUDIO_position, SPA_POD_Array(sizeof(uint32_t),
+					SPA_TYPE_Id, 2, position),
+				0);
+	} else if ((conf.channels & LC3PLUS_HR_CHANNELS_1) && lc3plus_channels_supported(1)) {
+		position[0] = SPA_AUDIO_CHANNEL_MONO;
+		spa_pod_builder_add(b,
+				SPA_FORMAT_AUDIO_channels, SPA_POD_Int(1),
+				SPA_FORMAT_AUDIO_position, SPA_POD_Array(sizeof(uint32_t),
+					SPA_TYPE_Id, 1, position),
+				0);
+	}
+
+	*param = spa_pod_builder_pop(b, &f[0]);
+	return *param == NULL ? -EIO : 1;
+}
+
+static int codec_validate_config(const struct media_codec *codec, uint32_t flags,
+			const void *caps, size_t caps_size,
+			struct spa_audio_info *info)
+{
+	const a2dp_lc3plus_hr_t *conf;
+
+	if (caps == NULL || caps_size < sizeof(*conf))
+		return -EINVAL;
+
+	conf = caps;
+
+	spa_zero(*info);
+	info->media_type = SPA_MEDIA_TYPE_audio;
+	info->media_subtype = SPA_MEDIA_SUBTYPE_raw;
+	info->info.raw.format = SPA_AUDIO_FORMAT_S24_32;
+
+	switch (LC3PLUS_HR_GET_FREQUENCY(*conf)) {
+	case LC3PLUS_HR_SAMPLING_FREQ_96000:
+		if (!lc3plus_samplerate_supported(96000))
+			return -EINVAL;
+		info->info.raw.rate = 96000;
+		break;
+	case LC3PLUS_HR_SAMPLING_FREQ_48000:
+		if (!lc3plus_samplerate_supported(48000))
+			return -EINVAL;
+		info->info.raw.rate = 48000;
+		break;
+	default:
+		return -EINVAL;
+        }
+
+	switch (conf->channels) {
+	case LC3PLUS_HR_CHANNELS_2:
+		if (!lc3plus_channels_supported(2))
+			return -EINVAL;
+		info->info.raw.channels = 2;
+		info->info.raw.position[0] = SPA_AUDIO_CHANNEL_FL;
+		info->info.raw.position[1] = SPA_AUDIO_CHANNEL_FR;
+		break;
+	case LC3PLUS_HR_CHANNELS_1:
+		if (!lc3plus_channels_supported(1))
+			return -EINVAL;
+		info->info.raw.channels = 1;
+		info->info.raw.position[0] = SPA_AUDIO_CHANNEL_MONO;
+                break;
+	default:
+		return -EINVAL;
+        }
+
+	switch (LC3PLUS_HR_GET_FRAME_DURATION(*conf)) {
+	case LC3PLUS_HR_FRAME_DURATION_10MS:
+	case LC3PLUS_HR_FRAME_DURATION_5MS:
+	case LC3PLUS_HR_FRAME_DURATION_2_5MS:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static size_t ceildiv(size_t v, size_t divisor)
+{
+	if (v % divisor == 0)
+		return v / divisor;
+	else
+		return v / divisor + 1;
+}
+
+static bool check_mtu_vs_frame_dms(struct impl *this)
+{
+	/* Only 10ms frames can be fragmented (max 0xf fragments);
+	 * others must fit in single MTU */
+	size_t header_size = sizeof(struct rtp_header) + sizeof(struct rtp_payload);
+	size_t max_fragments = (this->frame_dms == 100) ? 0xf : 1;
+	size_t payload_size = lc3plus_enc_get_num_bytes(this->enc);
+	return (size_t)this->mtu >= header_size + ceildiv(payload_size, max_fragments);
+}
+
+static void *codec_init(const struct media_codec *codec, uint32_t flags,
+		void *config, size_t config_len, const struct spa_audio_info *info,
+		void *props, size_t mtu)
+{
+	a2dp_lc3plus_hr_t *conf = config;
+	struct impl *this = NULL;
+	struct spa_audio_info config_info;
+	int size;
+	int res;
+
+	if (info->media_type != SPA_MEDIA_TYPE_audio ||
+	    info->media_subtype != SPA_MEDIA_SUBTYPE_raw ||
+	    info->info.raw.format != SPA_AUDIO_FORMAT_S24_32) {
+		res = -EINVAL;
+		goto error;
+	}
+
+	if ((this = calloc(1, sizeof(struct impl))) == NULL)
+		goto error_errno;
+
+	if ((res = codec_validate_config(codec, flags, config, config_len, &config_info)) < 0)
+		goto error;
+
+	this->mtu = mtu;
+	this->samplerate = config_info.info.raw.rate;
+	this->channels = config_info.info.raw.channels;
+	this->bitrate = BITRATE_DEFAULT * this->channels;
+
+	switch (LC3PLUS_HR_GET_FRAME_DURATION(*conf)) {
+	case LC3PLUS_HR_FRAME_DURATION_10MS:
+		this->frame_dms = 100;
+		break;
+	case LC3PLUS_HR_FRAME_DURATION_5MS:
+		this->frame_dms = 50;
+		break;
+	case LC3PLUS_HR_FRAME_DURATION_2_5MS:
+		this->frame_dms = 25;
+		break;
+	default:
+		res = -EINVAL;
+		goto error;
+	}
+
+	if ((size = lc3plus_enc_get_size(this->samplerate, this->channels)) == 0) {
+		res = -EIO;
+		goto error;
+	}
+	if ((this->enc = calloc(1, size)) == NULL)
+		goto error_errno;
+	if (lc3plus_enc_init(this->enc, this->samplerate, this->channels) != LC3PLUS_OK) {
+		res = -EINVAL;
+		goto error;
+	}
+	if (lc3plus_enc_set_frame_ms(this->enc, this->frame_dms/10.0f) != LC3PLUS_OK) {
+		res = -EINVAL;
+		goto error;
+	}
+	if (lc3plus_enc_set_hrmode(this->enc, 1) != LC3PLUS_OK) {
+		res = -EINVAL;
+		goto error;
+	}
+	while (1) {
+		/* Find a valid bitrate */
+		if (lc3plus_enc_set_bitrate(this->enc, this->bitrate) != LC3PLUS_OK) {
+			res = -EINVAL;
+			goto error;
+		}
+		if (check_mtu_vs_frame_dms(this))
+			break;
+		this->bitrate = this->bitrate * 3/4;
+	}
+
+	if ((size = lc3plus_dec_get_size(this->samplerate, this->channels)) == 0) {
+		res = -EINVAL;
+		goto error;
+	}
+	if ((this->dec = calloc(1, size)) == NULL)
+		goto error_errno;
+	if (lc3plus_dec_init(this->dec, this->samplerate, this->channels, LC3PLUS_PLC_ADVANCED) != LC3PLUS_OK) {
+		res = -EINVAL;
+		goto error;
+	}
+	if (lc3plus_dec_set_frame_ms(this->dec, this->frame_dms/10.0f) != LC3PLUS_OK) {
+		res = -EINVAL;
+		goto error;
+	}
+	if (lc3plus_dec_set_hrmode(this->dec, 1) != LC3PLUS_OK) {
+		res = -EINVAL;
+		goto error;
+	}
+
+	this->e.samples = lc3plus_enc_get_input_samples(this->enc);
+	this->e.codesize = this->e.samples * this->channels * sizeof(int32_t);
+
+	spa_assert(this->e.samples <= LC3PLUS_MAX_SAMPLES);
+
+	this->e.bitrate = this->bitrate;
+	this->e.next_bitrate = this->bitrate;
+
+	return this;
+
+error_errno:
+	res = -errno;
+	goto error;
+
+error:
+	if (this && this->enc)
+		lc3plus_enc_free_memory(this->enc);
+	if (this && this->dec)
+		lc3plus_dec_free_memory(this->dec);
+	free(this);
+	errno = -res;
+	return NULL;
+}
+
+static void codec_deinit(void *data)
+{
+	struct impl *this = data;
+	lc3plus_enc_free_memory(this->enc);
+	lc3plus_dec_free_memory(this->dec);
+	free(this);
+}
+
+static int codec_get_block_size(void *data)
+{
+	struct impl *this = data;
+	return this->e.codesize;
+}
+
+static int codec_abr_process (void *data, size_t unsent)
+{
+	return -ENOTSUP;
+}
+
+static int codec_update_bitrate(struct impl *this)
+{
+	this->e.next_bitrate = SPA_CLAMP(this->e.next_bitrate,
+			BITRATE_MIN * this->channels, BITRATE_MAX * this->channels);
+
+	if (this->e.next_bitrate == this->e.bitrate)
+		return 0;
+
+	this->e.bitrate = this->e.next_bitrate;
+
+	if (lc3plus_enc_set_bitrate(this->enc, this->e.bitrate) != LC3PLUS_OK ||
+			!check_mtu_vs_frame_dms(this)) {
+		lc3plus_enc_set_bitrate(this->enc, this->bitrate);
+		return -EINVAL;
+	}
+
+	this->bitrate = this->e.bitrate;
+
+	return 0;
+}
+
+static int codec_start_encode (void *data,
+		void *dst, size_t dst_size, uint16_t seqnum, uint32_t timestamp)
+{
+	struct impl *this = data;
+	size_t header_size = sizeof(struct rtp_header) + sizeof(struct rtp_payload);
+
+	if (dst_size <= header_size)
+		return -EINVAL;
+
+	codec_update_bitrate(this);
+
+	this->e.header = (struct rtp_header *)dst;
+	this->e.payload = SPA_PTROFF(dst, sizeof(struct rtp_header), struct rtp_payload);
+	memset(dst, 0, header_size);
+
+	this->e.payload->frame_count = 0;
+	this->e.header->v = 2;
+	this->e.header->pt = 96;
+	this->e.header->sequence_number = htons(seqnum);
+	this->e.header->timestamp = htonl(timestamp);
+	this->e.header->ssrc = htonl(1);
+
+	this->e.packet_size = header_size;
+	return this->e.packet_size;
+}
+
+static void deinterleave_32_c2(int32_t * SPA_RESTRICT * SPA_RESTRICT dst, const int32_t * SPA_RESTRICT src, size_t n_samples)
+{
+	/* We'll trust the compiler to optimize this */
+	const size_t n_channels = 2;
+	size_t i, j;
+	for (j = 0; j < n_samples; ++j)
+		for (i = 0; i < n_channels; ++i)
+			dst[i][j] = *src++;
+}
+
+static void interleave_32_c2(int32_t * SPA_RESTRICT dst, const int32_t * SPA_RESTRICT * SPA_RESTRICT src, size_t n_samples)
+{
+	const size_t n_channels = 2;
+	size_t i, j;
+	for (j = 0; j < n_samples; ++j)
+		for (i = 0; i < n_channels; ++i)
+			*dst++ = src[i][j];
+}
+
+static int codec_encode(void *data,
+		const void *src, size_t src_size,
+		void *dst, size_t dst_size,
+		size_t *dst_out, int *need_flush)
+{
+	struct impl *this = data;
+	int frame_bytes;
+	LC3PLUS_Error res;
+	int size, processed;
+	int header_size = sizeof(struct rtp_header) + sizeof(struct rtp_payload);
+	int32_t *inputs[2];
+
+	if (src == NULL) {
+		/* Produce fragment packets.
+		 *
+		 * We assume the caller gives the same buffer here as in the previous
+		 * calls to encode(), without changes in the buffer content.
+		 */
+		if (this->e.fragment == NULL ||
+				this->e.fragment_count <= 1 ||
+				this->e.fragment < dst ||
+				SPA_PTROFF(this->e.fragment, this->e.fragment_size, void) > SPA_PTROFF(dst, dst_size, void)) {
+			this->e.fragment = NULL;
+			return -EINVAL;
+		}
+
+		size = SPA_MIN(this->mtu - header_size, this->e.fragment_size);
+		memmove(dst, this->e.fragment, size);
+		*dst_out = size;
+
+		this->e.payload->is_fragmented = 1;
+		this->e.payload->frame_count = --this->e.fragment_count;
+		this->e.payload->is_last_fragment = (this->e.fragment_count == 1);
+
+		if (this->e.fragment_size > size && this->e.fragment_count > 1) {
+			this->e.fragment = SPA_PTROFF(this->e.fragment, size, void);
+			this->e.fragment_size -= size;
+			*need_flush = NEED_FLUSH_FRAGMENT;
+		} else {
+			this->e.fragment = NULL;
+			*need_flush = NEED_FLUSH_ALL;
+		}
+		return 0;
+	}
+
+	frame_bytes = lc3plus_enc_get_num_bytes(this->enc);
+	processed = 0;
+
+	if (src_size < (size_t)this->e.codesize)
+		goto done;
+	if (dst_size < (size_t)frame_bytes)
+		goto done;
+	if (this->e.payload->frame_count > 0 &&
+			this->e.packet_size + frame_bytes > this->mtu)
+		goto done;
+
+	if (this->channels == 1) {
+		inputs[0] = (int32_t *)src;
+		res = lc3plus_enc24(this->enc, inputs, dst, &size);
+	} else {
+		inputs[0] = this->buf[0];
+		inputs[1] = this->buf[1];
+		deinterleave_32_c2(inputs, src, this->e.samples);
+		res = lc3plus_enc24(this->enc, inputs, dst, &size);
+	}
+	if (SPA_UNLIKELY(res != LC3PLUS_OK))
+		return -EINVAL;
+	*dst_out = size;
+
+	processed += this->e.codesize;
+	this->e.packet_size += size;
+	this->e.payload->frame_count++;
+
+done:
+	if (this->e.payload->frame_count == 0)
+		return processed;
+	if (this->e.payload->frame_count < 0xf &&
+			this->frame_dms * (this->e.payload->frame_count + 1) < 200 &&
+			this->e.packet_size + frame_bytes <= this->mtu)
+		return processed;  /* add another frame */
+
+	if (this->e.packet_size > this->mtu) {
+		/* Fragment packet */
+		spa_assert(this->e.payload->frame_count == 1);
+		spa_assert(this->frame_dms == 100);
+
+		this->e.fragment_count = ceildiv(this->e.packet_size - header_size,
+				this->mtu - header_size);
+
+		this->e.payload->is_fragmented = 1;
+		this->e.payload->is_first_fragment = 1;
+		this->e.payload->frame_count = this->e.fragment_count;
+
+		this->e.fragment_size = this->e.packet_size - this->mtu;
+		this->e.fragment = SPA_PTROFF(dst, *dst_out - this->e.fragment_size, void);
+		*need_flush = NEED_FLUSH_FRAGMENT;
+
+		/*
+		 * We keep the rest of the encoded frame in the same buffer, and rely
+		 * that the caller won't overwrite it before the next call to encode()
+		 */
+		*dst_out = SPA_PTRDIFF(this->e.fragment, dst);
+	} else {
+		*need_flush = NEED_FLUSH_ALL;
+	}
+
+	return processed;
+}
+
+static SPA_UNUSED int codec_start_decode (void *data,
+		const void *src, size_t src_size, uint16_t *seqnum, uint32_t *timestamp)
+{
+	struct impl *this = data;
+	const struct rtp_header *header = src;
+	const struct rtp_payload *payload = SPA_PTROFF(src, sizeof(struct rtp_header), void);
+	size_t header_size = sizeof(struct rtp_header) + sizeof(struct rtp_payload);
+
+	spa_return_val_if_fail (src_size > header_size, -EINVAL);
+
+	if (seqnum)
+		*seqnum = ntohs(header->sequence_number);
+	if (timestamp)
+		*timestamp = ntohl(header->timestamp);
+
+	if (payload->is_fragmented) {
+		if (payload->is_first_fragment) {
+			this->d.fragment_size = 0;
+		} else if (payload->frame_count + 1 != this->d.fragment_count ||
+				(payload->frame_count == 1 && !payload->is_last_fragment)){
+			/* Fragments not in right order: drop packet */
+			return -EINVAL;
+		}
+		this->d.fragment_count = payload->frame_count;
+		this->d.frame_size = src_size - header_size;
+	} else {
+		if (payload->frame_count <= 0)
+			return -EINVAL;
+		this->d.fragment_count = 0;
+		this->d.frame_size = (src_size - header_size) / payload->frame_count;
+		if (this->d.frame_size <= 0)
+			return -EINVAL;
+	}
+
+	return header_size;
+}
+
+static SPA_UNUSED int codec_decode(void *data,
+		const void *src, size_t src_size,
+		void *dst, size_t dst_size,
+		size_t *dst_out)
+{
+	struct impl *this = data;
+	LC3PLUS_Error res;
+	int32_t *outputs[2];
+	int consumed;
+	int samples;
+
+	if (this->d.fragment_count > 0) {
+		/* Fragmented frame */
+		size_t avail;
+		avail = SPA_MIN(sizeof(this->d.fragment) - this->d.fragment_size, src_size);
+		memcpy(SPA_PTROFF(this->d.fragment, this->d.fragment_size, void), src, avail);
+
+		this->d.fragment_size += avail;
+		consumed = src_size;
+
+		if (this->d.fragment_count > 1) {
+			/* More fragments to come */
+			*dst_out = 0;
+			return consumed;
+		}
+
+		src = this->d.fragment;
+		src_size = this->d.fragment_size;
+
+		this->d.fragment_count = 0;
+		this->d.fragment_size = 0;
+	} else {
+		src_size = SPA_MIN((size_t)this->d.frame_size, src_size);
+		consumed = src_size;
+	}
+
+	samples = lc3plus_dec_get_output_samples(this->dec);
+	*dst_out = samples * this->channels * sizeof(int32_t);
+	if (dst_size < *dst_out)
+		return -EINVAL;
+
+	if (this->channels == 1) {
+		outputs[0] = (int32_t *)dst;
+		res = lc3plus_dec24(this->dec, (void *)src, src_size, outputs, 0);
+	} else {
+		outputs[0] = this->buf[0];
+		outputs[1] = this->buf[1];
+		res = lc3plus_dec24(this->dec, (void *)src, src_size, outputs, 0);
+		interleave_32_c2(dst, (const int32_t**)outputs, samples);
+	}
+	if (SPA_UNLIKELY(res != LC3PLUS_OK && res != LC3PLUS_DECODE_ERROR))
+		return -EINVAL;
+
+	return consumed;
+}
+
+static int codec_reduce_bitpool(void *data)
+{
+	struct impl *this = data;
+	this->e.next_bitrate = SPA_CLAMP(this->bitrate * 3 / 4,
+			BITRATE_MIN * this->channels, BITRATE_MAX * this->channels);
+	return this->e.next_bitrate;
+}
+
+static int codec_increase_bitpool(void *data)
+{
+	struct impl *this = data;
+	this->e.next_bitrate = SPA_CLAMP(this->bitrate * 5 / 4,
+			BITRATE_MIN * this->channels, BITRATE_MAX * this->channels);
+	return this->e.next_bitrate;
+}
+
+const struct media_codec a2dp_codec_lc3plus_hr = {
+	.id = SPA_BLUETOOTH_AUDIO_CODEC_LC3PLUS_HR,
+	.name = "lc3plus_hr",
+	.codec_id = A2DP_CODEC_VENDOR,
+	.vendor = { .vendor_id = LC3PLUS_HR_VENDOR_ID,
+		.codec_id = LC3PLUS_HR_CODEC_ID },
+	.description = "LC3plus HR",
+	.fill_caps = codec_fill_caps,
+	.select_config = codec_select_config,
+	.enum_config = codec_enum_config,
+	.validate_config = codec_validate_config,
+	.caps_preference_cmp = codec_caps_preference_cmp,
+	.init = codec_init,
+	.deinit = codec_deinit,
+	.get_block_size = codec_get_block_size,
+	.abr_process = codec_abr_process,
+	.start_encode = codec_start_encode,
+	.encode = codec_encode,
+	.start_decode = codec_start_decode,
+	.decode = codec_decode,
+	.reduce_bitpool = codec_reduce_bitpool,
+	.increase_bitpool = codec_increase_bitpool
+};
+
+MEDIA_CODEC_EXPORT_DEF(
+	"lc3plus",
+	&a2dp_codec_lc3plus_hr
+);