This patch provides support for aptX and aptX HD codecs in bluetooth A2DP profile. It uses open source LGPLv2.1+ licensed libopenaptx library which can be found at https://github.com/pali/libopenaptx. aptX for s24 stereo samples provides fixed 6:1 compression ratio and bitrate 352.8 kbit/s, aptX HD provides fixed 4:1 compression ratio and bitrate 529.2 kbit/s. According to soundexpert research, aptX codec used in bluetooth A2DP is no better than SBC High Quality settings. And you cannot hear difference between aptX and SBC High Quality, aptX is just a copper-less overpriced audio cable. aptX HD is high-bitrate version of aptX. It has clearly noticeable increase in sound quality (not dramatic though taking into account the increase in bitrate). http://soundexpert.org/news/-/blogs/audio-quality-of-bluetooth-aptx --- configure.ac | 36 +++ src/Makefile.am | 6 + src/modules/bluetooth/a2dp-codec-aptx.c | 400 ++++++++++++++++++++++++++++++++ src/modules/bluetooth/a2dp-codec-util.c | 8 + 4 files changed, 450 insertions(+) create mode 100644 src/modules/bluetooth/a2dp-codec-aptx.c diff --git a/configure.ac b/configure.ac index b44ed1595..de63d7aa7 100644 --- a/configure.ac +++ b/configure.ac @@ -1106,6 +1106,40 @@ AC_SUBST(HAVE_BLUEZ_5_NATIVE_HEADSET) AM_CONDITIONAL([HAVE_BLUEZ_5_NATIVE_HEADSET], [test "x$HAVE_BLUEZ_5_NATIVE_HEADSET" = x1]) AS_IF([test "x$HAVE_BLUEZ_5_NATIVE_HEADSET" = "x1"], AC_DEFINE([HAVE_BLUEZ_5_NATIVE_HEADSET], 1, [Bluez 5 native headset backend enabled])) +#### Bluetooth A2DP aptX codec (optional) ### + +AC_ARG_ENABLE([aptx], + AS_HELP_STRING([--disable-aptx],[Disable optional bluetooth A2DP aptX and aptX HD codecs support (via libopenaptx)])) +AC_ARG_VAR([OPENAPTX_CPPFLAGS], [C preprocessor flags for openaptx]) +AC_ARG_VAR([OPENAPTX_LDFLAGS], [linker flags for openaptx]) + +CPPFLAGS_SAVE="$CPPFLAGS" +LDFLAGS_SAVE="$LDFLAGS" +LIBS_SAVE="$LIBS" + +CPPFLAGS="$CPPFLAGS $OPENAPTX_CPPFLAGS" +LDFLAGS="$LDFLAGS $OPENAPTX_LDFLAGS" + +AS_IF([test "x$HAVE_BLUEZ_5" = "x1" && test "x$enable_aptx" != "xno"], + [AC_CHECK_HEADER([openaptx.h], + [AC_SEARCH_LIBS([aptx_init], [openaptx], + [HAVE_OPENAPTX=1; AS_IF([test "x$ac_cv_search_aptx_init" != "xnone required"], [OPENAPTX_LDFLAGS="$OPENAPTX_LDFLAGS $ac_cv_search_aptx_init"])], + [HAVE_OPENAPTX=0])], + [HAVE_OPENAPTX=0])]) + +CPPFLAGS="$CPPFLAGS_SAVE" +LDFLAGS="$LDFLAGS_SAVE" +LIBS="$LIBS_SAVE" + +AS_IF([test "x$HAVE_BLUEZ_5" = "x1" && test "x$enable_aptx" = "xyes" && test "x$HAVE_OPENAPTX" = "x0"], + [AC_MSG_ERROR([*** libopenaptx from https://github.com/pali/libopenaptx not found])]) + +AC_SUBST(OPENAPTX_CPPFLAGS) +AC_SUBST(OPENAPTX_LDFLAGS) +AC_SUBST(HAVE_OPENAPTX) +AM_CONDITIONAL([HAVE_OPENAPTX], [test "x$HAVE_OPENAPTX" = "x1"]) +AS_IF([test "x$HAVE_OPENAPTX" = "x1"], AC_DEFINE([HAVE_OPENAPTX], 1, [Have openaptx codec library])) + #### UDEV support (optional) #### AC_ARG_ENABLE([udev], @@ -1591,6 +1625,7 @@ AS_IF([test "x$HAVE_SYSTEMD_JOURNAL" = "x1"], ENABLE_SYSTEMD_JOURNAL=yes, ENABLE AS_IF([test "x$HAVE_BLUEZ_5" = "x1"], ENABLE_BLUEZ_5=yes, ENABLE_BLUEZ_5=no) AS_IF([test "x$HAVE_BLUEZ_5_OFONO_HEADSET" = "x1"], ENABLE_BLUEZ_5_OFONO_HEADSET=yes, ENABLE_BLUEZ_5_OFONO_HEADSET=no) AS_IF([test "x$HAVE_BLUEZ_5_NATIVE_HEADSET" = "x1"], ENABLE_BLUEZ_5_NATIVE_HEADSET=yes, ENABLE_BLUEZ_5_NATIVE_HEADSET=no) +AS_IF([test "x$HAVE_OPENAPTX" = "x1"], ENABLE_APTX=yes, ENABLE_APTX=no) AS_IF([test "x$HAVE_HAL_COMPAT" = "x1"], ENABLE_HAL_COMPAT=yes, ENABLE_HAL_COMPAT=no) AS_IF([test "x$HAVE_TCPWRAP" = "x1"], ENABLE_TCPWRAP=yes, ENABLE_TCPWRAP=no) AS_IF([test "x$HAVE_LIBSAMPLERATE" = "x1"], ENABLE_LIBSAMPLERATE="yes (DEPRECATED)", ENABLE_LIBSAMPLERATE=no) @@ -1649,6 +1684,7 @@ echo " Enable BlueZ 5: ${ENABLE_BLUEZ_5} Enable ofono headsets: ${ENABLE_BLUEZ_5_OFONO_HEADSET} Enable native headsets: ${ENABLE_BLUEZ_5_NATIVE_HEADSET} + Enable aptX+aptXHD codecs: ${ENABLE_APTX} Enable udev: ${ENABLE_UDEV} Enable HAL->udev compat: ${ENABLE_HAL_COMPAT} Enable systemd diff --git a/src/Makefile.am b/src/Makefile.am index 5ef870e32..a303578bb 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -2154,6 +2154,12 @@ libbluez5_util_la_SOURCES += modules/bluetooth/a2dp-codec-sbc.c libbluez5_util_la_LIBADD += $(SBC_LIBS) libbluez5_util_la_CFLAGS += $(SBC_CFLAGS) +if HAVE_OPENAPTX +libbluez5_util_la_SOURCES += modules/bluetooth/a2dp-codec-aptx.c +libbluez5_util_la_CPPFLAGS += $(OPENAPTX_CPPFLAGS) +libbluez5_util_la_LDFLAGS += $(OPENAPTX_LDFLAGS) +endif + module_bluez5_discover_la_SOURCES = modules/bluetooth/module-bluez5-discover.c module_bluez5_discover_la_LDFLAGS = $(MODULE_LDFLAGS) module_bluez5_discover_la_LIBADD = $(MODULE_LIBADD) $(DBUS_LIBS) libbluez5-util.la diff --git a/src/modules/bluetooth/a2dp-codec-aptx.c b/src/modules/bluetooth/a2dp-codec-aptx.c new file mode 100644 index 000000000..e4d7b997a --- /dev/null +++ b/src/modules/bluetooth/a2dp-codec-aptx.c @@ -0,0 +1,400 @@ +/*** + This file is part of PulseAudio. + + Copyright 2018-2019 Pali Rohár <pali.rohar@xxxxxxxxx> + + PulseAudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + PulseAudio is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>. +***/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <pulsecore/log.h> +#include <pulsecore/macro.h> +#include <pulsecore/once.h> +#include <pulse/sample.h> + +#include <openaptx.h> + +#include "a2dp-codecs.h" +#include "a2dp-codec-api.h" + +static bool can_accept_capabilities_common(const a2dp_aptx_t *capabilities, uint32_t vendor_id, uint16_t codec_id) { + if (!(capabilities->frequency & (APTX_SAMPLING_FREQ_16000 | APTX_SAMPLING_FREQ_32000 | + APTX_SAMPLING_FREQ_44100 | APTX_SAMPLING_FREQ_48000))) + return false; + + if (A2DP_GET_VENDOR_ID(capabilities->info) != vendor_id || A2DP_GET_CODEC_ID(capabilities->info) != codec_id) + return false; + + if (!(capabilities->channel_mode & APTX_CHANNEL_MODE_STEREO)) + return false; + + return true; +} + +static bool can_accept_capabilities(const uint8_t *capabilities_buffer, uint8_t capabilities_size, bool for_encoding) { + const a2dp_aptx_t *capabilities = (const a2dp_aptx_t *) capabilities_buffer; + + if (capabilities_size != sizeof(*capabilities)) + return false; + + return can_accept_capabilities_common(capabilities, APTX_VENDOR_ID, APTX_CODEC_ID); +} + +static bool can_accept_capabilities_hd(const uint8_t *capabilities_buffer, uint8_t capabilities_size, bool for_encoding) { + const a2dp_aptx_hd_t *capabilities = (const a2dp_aptx_hd_t *) capabilities_buffer; + + if (capabilities_size != sizeof(*capabilities)) + return false; + + return can_accept_capabilities_common(&capabilities->aptx, APTX_HD_VENDOR_ID, APTX_HD_CODEC_ID); +} + +static const char *choose_remote_endpoint_common(bool (*can_accept_capabilities_func)(const uint8_t *, uint8_t, bool), const pa_hashmap *capabilities_hashmap, bool for_encoding) { + const pa_a2dp_codec_capabilities *a2dp_capabilities; + const char *key; + void *state; + + /* There is no preference, just choose random valid entry */ + PA_HASHMAP_FOREACH_KV(key, a2dp_capabilities, capabilities_hashmap, state) { + if (can_accept_capabilities_func(a2dp_capabilities->buffer, a2dp_capabilities->size, for_encoding)) + return key; + } + + return NULL; +} + +static const char *choose_remote_endpoint(const pa_hashmap *capabilities_hashmap, const pa_sample_spec *default_sample_spec, bool for_encoding) { + return choose_remote_endpoint_common(can_accept_capabilities, capabilities_hashmap, for_encoding); +} + +static const char *choose_remote_endpoint_hd(const pa_hashmap *capabilities_hashmap, const pa_sample_spec *default_sample_spec, bool for_encoding) { + return choose_remote_endpoint_common(can_accept_capabilities_hd, capabilities_hashmap, for_encoding); +} + +static void fill_capabilities_common(a2dp_aptx_t *capabilities, uint32_t vendor_id, uint16_t codec_id) { + capabilities->info = A2DP_SET_VENDOR_ID_CODEC_ID(vendor_id, codec_id); + capabilities->channel_mode = APTX_CHANNEL_MODE_STEREO; + capabilities->frequency = APTX_SAMPLING_FREQ_16000 | APTX_SAMPLING_FREQ_32000 | + APTX_SAMPLING_FREQ_44100 | APTX_SAMPLING_FREQ_48000; +} + +static uint8_t fill_capabilities(uint8_t capabilities_buffer[MAX_A2DP_CAPS_SIZE]) { + a2dp_aptx_t *capabilities = (a2dp_aptx_t *) capabilities_buffer; + + pa_zero(*capabilities); + fill_capabilities_common(capabilities, APTX_VENDOR_ID, APTX_CODEC_ID); + return sizeof(*capabilities); +} + +static uint8_t fill_capabilities_hd(uint8_t capabilities_buffer[MAX_A2DP_CAPS_SIZE]) { + a2dp_aptx_hd_t *capabilities = (a2dp_aptx_hd_t *) capabilities_buffer; + + pa_zero(*capabilities); + fill_capabilities_common(&capabilities->aptx, APTX_HD_VENDOR_ID, APTX_HD_CODEC_ID); + return sizeof(*capabilities); +} + +static bool is_configuration_valid_common(const a2dp_aptx_t *config, uint32_t vendor_id, uint16_t codec_id) { + if (A2DP_GET_VENDOR_ID(config->info) != vendor_id || A2DP_GET_CODEC_ID(config->info) != codec_id) { + pa_log_error("Invalid vendor codec information in configuration"); + return false; + } + + if (config->frequency != APTX_SAMPLING_FREQ_16000 && config->frequency != APTX_SAMPLING_FREQ_32000 && + config->frequency != APTX_SAMPLING_FREQ_44100 && config->frequency != APTX_SAMPLING_FREQ_48000) { + pa_log_error("Invalid sampling frequency in configuration"); + return false; + } + + if (config->channel_mode != APTX_CHANNEL_MODE_STEREO) { + pa_log_error("Invalid channel mode in configuration"); + return false; + } + + return true; +} + +static bool is_configuration_valid(const uint8_t *config_buffer, uint8_t config_size) { + const a2dp_aptx_t *config = (const a2dp_aptx_t *) config_buffer; + + if (config_size != sizeof(*config)) { + pa_log_error("Invalid size of config buffer"); + return false; + } + + return is_configuration_valid_common(config, APTX_VENDOR_ID, APTX_CODEC_ID); +} + +static bool is_configuration_valid_hd(const uint8_t *config_buffer, uint8_t config_size) { + const a2dp_aptx_hd_t *config = (const a2dp_aptx_hd_t *) config_buffer; + + if (config_size != sizeof(*config)) { + pa_log_error("Invalid size of config buffer"); + return false; + } + + return is_configuration_valid_common(&config->aptx, APTX_HD_VENDOR_ID, APTX_HD_CODEC_ID); +} + +static bool fill_preferred_configuration_common(const pa_sample_spec *default_sample_spec, const a2dp_aptx_t *capabilities, a2dp_aptx_t *config, uint32_t vendor_id, uint16_t codec_id) { + int i; + + static const struct { + uint32_t rate; + uint8_t cap; + } freq_table[] = { + { 16000U, APTX_SAMPLING_FREQ_16000 }, + { 32000U, APTX_SAMPLING_FREQ_32000 }, + { 44100U, APTX_SAMPLING_FREQ_44100 }, + { 48000U, APTX_SAMPLING_FREQ_48000 } + }; + + if (A2DP_GET_VENDOR_ID(capabilities->info) != vendor_id || A2DP_GET_CODEC_ID(capabilities->info) != codec_id) { + pa_log_error("No supported vendor codec information"); + return false; + } + + config->info = A2DP_SET_VENDOR_ID_CODEC_ID(vendor_id, codec_id); + + if (!(capabilities->channel_mode & APTX_CHANNEL_MODE_STEREO)) { + pa_log_error("No supported channel modes"); + return false; + } + + config->channel_mode = APTX_CHANNEL_MODE_STEREO; + + /* Find the lowest freq that is at least as high as the requested sampling rate */ + for (i = 0; (unsigned) i < PA_ELEMENTSOF(freq_table); i++) { + if (freq_table[i].rate >= default_sample_spec->rate && (capabilities->frequency & freq_table[i].cap)) { + config->frequency = freq_table[i].cap; + break; + } + } + + if ((unsigned) i == PA_ELEMENTSOF(freq_table)) { + for (--i; i >= 0; i--) { + if (capabilities->frequency & freq_table[i].cap) { + config->frequency = freq_table[i].cap; + break; + } + } + + if (i < 0) { + pa_log_error("Not suitable sample rate"); + return false; + } + } + + return true; +} + +static uint8_t fill_preferred_configuration(const pa_sample_spec *default_sample_spec, const uint8_t *capabilities_buffer, uint8_t capabilities_size, uint8_t config_buffer[MAX_A2DP_CAPS_SIZE]) { + a2dp_aptx_t *config = (a2dp_aptx_t *) config_buffer; + const a2dp_aptx_t *capabilities = (const a2dp_aptx_t *) capabilities_buffer; + + if (capabilities_size != sizeof(*capabilities)) { + pa_log_error("Invalid size of capabilities buffer"); + return 0; + } + + pa_zero(*config); + + if (!fill_preferred_configuration_common(default_sample_spec, capabilities, config, APTX_VENDOR_ID, APTX_CODEC_ID)) + return 0; + + return sizeof(*config); +} + +static uint8_t fill_preferred_configuration_hd(const pa_sample_spec *default_sample_spec, const uint8_t *capabilities_buffer, uint8_t capabilities_size, uint8_t config_buffer[MAX_A2DP_CAPS_SIZE]) { + a2dp_aptx_hd_t *config = (a2dp_aptx_hd_t *) config_buffer; + const a2dp_aptx_hd_t *capabilities = (const a2dp_aptx_hd_t *) capabilities_buffer; + + if (capabilities_size != sizeof(*capabilities)) { + pa_log_error("Invalid size of capabilities buffer"); + return 0; + } + + pa_zero(*config); + + if (!fill_preferred_configuration_common(default_sample_spec, &capabilities->aptx, &config->aptx, APTX_HD_VENDOR_ID, APTX_HD_CODEC_ID)) + return 0; + + return sizeof(*config); +} + +static void *init_common(const a2dp_aptx_t *config, pa_sample_spec *sample_spec, int hd) { + struct aptx_context *aptx_c; + + aptx_c = aptx_init(hd); + if (!aptx_c) { + pa_log_error("libopenaptx initialization failed"); + return NULL; + } + + sample_spec->format = PA_SAMPLE_S24LE; + + switch (config->frequency) { + case APTX_SAMPLING_FREQ_16000: + sample_spec->rate = 16000U; + break; + case APTX_SAMPLING_FREQ_32000: + sample_spec->rate = 32000U; + break; + case APTX_SAMPLING_FREQ_44100: + sample_spec->rate = 44100U; + break; + case APTX_SAMPLING_FREQ_48000: + sample_spec->rate = 48000U; + break; + default: + pa_assert_not_reached(); + } + + switch (config->channel_mode) { + case APTX_CHANNEL_MODE_STEREO: + sample_spec->channels = 2; + break; + default: + pa_assert_not_reached(); + } + + PA_ONCE_BEGIN { +#if OPENAPTX_MAJOR == 0 && OPENAPTX_MINOR == 0 && OPENAPTX_PATCH == 0 + /* libopenaptx version 0.0.0 does not export version global variables */ + const int aptx_major = OPENAPTX_MAJOR; + const int aptx_minor = OPENAPTX_MINOR; + const int aptx_patch = OPENAPTX_PATCH; +#endif + pa_log_debug("Using aptX codec implementation: libopenaptx %d.%d.%d from https://github.com/pali/libopenaptx";, aptx_major, aptx_minor, aptx_patch); + } PA_ONCE_END; + + return aptx_c; +} + +static void *init(bool for_encoding, bool for_backchannel, const uint8_t *config_buffer, uint8_t config_size, pa_sample_spec *sample_spec) { + const a2dp_aptx_t *config = (const a2dp_aptx_t *) config_buffer; + + pa_assert(config_size == sizeof(*config)); + pa_assert(!for_backchannel); + + return init_common(config, sample_spec, 0); +} + +static void *init_hd(bool for_encoding, bool for_backchannel, const uint8_t *config_buffer, uint8_t config_size, pa_sample_spec *sample_spec) { + const a2dp_aptx_hd_t *config = (const a2dp_aptx_hd_t *) config_buffer; + + pa_assert(config_size == sizeof(*config)); + pa_assert(!for_backchannel); + + return init_common(&config->aptx, sample_spec, 1); +} + +static void deinit(void *codec_info) { + struct aptx_context *aptx_c = (struct aptx_context *) codec_info; + + aptx_finish(aptx_c); +} + +static void reset(void *codec_info) { + struct aptx_context *aptx_c = (struct aptx_context *) codec_info; + + aptx_reset(aptx_c); +} + +static void get_buffer_size(void *codec_info, size_t link_mtu, size_t *decoded_buffer_size, size_t *encoded_buffer_size) { + /* aptX compression ratio is 6:1 and we need to process 4 aptX bytes at once */ + *encoded_buffer_size = (link_mtu/4) * 4; + *decoded_buffer_size = *encoded_buffer_size * 6; +} + +static void get_buffer_size_hd(void *codec_info, size_t link_mtu, size_t *decoded_buffer_size, size_t *encoded_buffer_size) { + /* aptX HD compression ratio is 4:1 and we need to process 4 aptX HD bytes at once */ + *encoded_buffer_size = (link_mtu/4) * 4; + *decoded_buffer_size = *encoded_buffer_size * 4; +} + +static int reduce_encoder_bitrate(void *codec_info) { + return -1; +} + +static size_t encode_buffer(void *codec_info, uint32_t timestamp, const uint8_t *input_buffer, size_t input_size, uint8_t *output_buffer, size_t output_size, size_t *processed) { + struct aptx_context *aptx_c = (struct aptx_context *) codec_info; + size_t written; + + *processed = aptx_encode(aptx_c, input_buffer, input_size, output_buffer, output_size, &written); + if (PA_UNLIKELY(*processed == 0 || *processed != input_size)) + pa_log_error("aptX encoding error"); + + return written; +} + +static size_t decode_buffer(void *codec_info, const uint8_t *input_buffer, size_t input_size, uint8_t *output_buffer, size_t output_size, size_t *processed) { + struct aptx_context *aptx_c = (struct aptx_context *) codec_info; + size_t written; + + *processed = aptx_decode(aptx_c, input_buffer, input_size, output_buffer, output_size, &written); + + /* Due to aptX latency, aptx_decode starts filling output buffer after 90 input samples. + * If input buffer contains less than 90 samples, aptx_decode returns zero (=no output) + * but set *processed to non zero as input samples were processed. So not check for + * return value of aptx_decode, zero is valid. Decoding error is indicating by fact that + * not all input samples were processed. */ + if (PA_UNLIKELY(*processed != input_size)) + pa_log_error("aptX decoding error"); + + return written; +} + +const pa_a2dp_codec pa_a2dp_codec_aptx = { + .name = "aptx", + .description = "aptX", + .id = { A2DP_CODEC_VENDOR, APTX_VENDOR_ID, APTX_CODEC_ID }, + .support_backchannel = false, + .can_accept_capabilities = can_accept_capabilities, + .choose_remote_endpoint = choose_remote_endpoint, + .fill_capabilities = fill_capabilities, + .is_configuration_valid = is_configuration_valid, + .fill_preferred_configuration = fill_preferred_configuration, + .init = init, + .deinit = deinit, + .reset = reset, + .get_read_buffer_size = get_buffer_size, + .get_write_buffer_size = get_buffer_size, + .reduce_encoder_bitrate = reduce_encoder_bitrate, + .encode_buffer = encode_buffer, + .decode_buffer = decode_buffer, +}; + +const pa_a2dp_codec pa_a2dp_codec_aptx_hd = { + .name = "aptx_hd", + .description = "aptX HD", + .id = { A2DP_CODEC_VENDOR, APTX_HD_VENDOR_ID, APTX_HD_CODEC_ID }, + .support_backchannel = false, + .can_accept_capabilities = can_accept_capabilities_hd, + .choose_remote_endpoint = choose_remote_endpoint_hd, + .fill_capabilities = fill_capabilities_hd, + .is_configuration_valid = is_configuration_valid_hd, + .fill_preferred_configuration = fill_preferred_configuration_hd, + .init = init_hd, + .deinit = deinit, + .reset = reset, + .get_read_buffer_size = get_buffer_size_hd, + .get_write_buffer_size = get_buffer_size_hd, + .reduce_encoder_bitrate = reduce_encoder_bitrate, + .encode_buffer = encode_buffer, + .decode_buffer = decode_buffer, +}; diff --git a/src/modules/bluetooth/a2dp-codec-util.c b/src/modules/bluetooth/a2dp-codec-util.c index 94d01e7bd..363fcc387 100644 --- a/src/modules/bluetooth/a2dp-codec-util.c +++ b/src/modules/bluetooth/a2dp-codec-util.c @@ -27,11 +27,19 @@ #include "a2dp-codec-util.h" extern const pa_a2dp_codec pa_a2dp_codec_sbc; +#ifdef HAVE_OPENAPTX +extern const pa_a2dp_codec pa_a2dp_codec_aptx; +extern const pa_a2dp_codec pa_a2dp_codec_aptx_hd; +#endif /* This is list of supported codecs. Their order is important. * Codec with higher index has higher priority. */ const pa_a2dp_codec *pa_a2dp_codecs[] = { &pa_a2dp_codec_sbc, +#ifdef HAVE_OPENAPTX + &pa_a2dp_codec_aptx, + &pa_a2dp_codec_aptx_hd, +#endif }; unsigned int pa_bluetooth_a2dp_codec_count(void) { -- 2.11.0 _______________________________________________ pulseaudio-discuss mailing list pulseaudio-discuss@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss
