mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
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90b62ba2b3
Support the low-latency variant of the aptx codec. The magic mostly seems to be on the device side, since the stream is the same as standard aptx, but latency is smaller even if stream/packet sizes are the same. Sound output latency is noticeably less than with the standard aptx. Tested on Sennheiser HD 250 / Avantree Aria Pro. The codec in principle also supports bidirectional duplex streams, but that is not implemented here.
162 lines
3.3 KiB
C
162 lines
3.3 KiB
C
/*
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* BlueALSA - bluez-a2dp.c
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* Copyright (c) 2016-2017 Arkadiusz Bokowy
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*
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* This file is a part of bluez-alsa.
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*
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* This project is licensed under the terms of the MIT license.
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*
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*/
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#include "a2dp-codecs.h"
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int a2dp_codec_select_config(const struct a2dp_codec_config configs[], size_t n,
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uint32_t cap, int preferred_value)
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{
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size_t i;
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int *scores, res;
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unsigned int max_priority;
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if (n == 0)
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return -EINVAL;
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scores = calloc(n, sizeof(int));
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if (scores == NULL)
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return -errno;
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max_priority = configs[0].priority;
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for (i = 1; i < n; ++i) {
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if (configs[i].priority > max_priority)
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max_priority = configs[i].priority;
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}
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for (i = 0; i < n; ++i) {
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if (!(configs[i].config & cap)) {
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scores[i] = -1;
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continue;
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}
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if (configs[i].value == preferred_value)
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scores[i] = 100 * (max_priority + 1);
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else if (configs[i].value > preferred_value)
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scores[i] = 10 * (max_priority + 1);
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else
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scores[i] = 1;
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scores[i] *= configs[i].priority + 1;
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}
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res = 0;
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for (i = 1; i < n; ++i) {
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if (scores[i] > scores[res])
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res = i;
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}
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if (scores[res] < 0)
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res = -EINVAL;
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free(scores);
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return res;
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}
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bool a2dp_codec_check_caps(const struct a2dp_codec *codec, unsigned int codec_id,
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const void *caps, size_t caps_size,
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const struct a2dp_codec_audio_info *info)
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{
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uint8_t config[A2DP_MAX_CAPS_SIZE];
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int res;
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if (codec_id != codec->codec_id)
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return false;
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if (caps == NULL)
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return false;
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res = codec->select_config(codec, 0, caps, caps_size, info, NULL, config);
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if (res < 0)
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return false;
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return ((size_t)res == caps_size);
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}
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#if ENABLE_MP3
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const a2dp_mpeg_t bluez_a2dp_mpeg = {
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.layer =
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MPEG_LAYER_MP1 |
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MPEG_LAYER_MP2 |
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MPEG_LAYER_MP3,
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.crc = 1,
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.channel_mode =
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MPEG_CHANNEL_MODE_MONO |
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MPEG_CHANNEL_MODE_DUAL_CHANNEL |
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MPEG_CHANNEL_MODE_STEREO |
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MPEG_CHANNEL_MODE_JOINT_STEREO,
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.mpf = 1,
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.frequency =
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MPEG_SAMPLING_FREQ_16000 |
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MPEG_SAMPLING_FREQ_22050 |
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MPEG_SAMPLING_FREQ_24000 |
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MPEG_SAMPLING_FREQ_32000 |
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MPEG_SAMPLING_FREQ_44100 |
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MPEG_SAMPLING_FREQ_48000,
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.bitrate =
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MPEG_BIT_RATE_VBR |
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MPEG_BIT_RATE_320000 |
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MPEG_BIT_RATE_256000 |
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MPEG_BIT_RATE_224000 |
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MPEG_BIT_RATE_192000 |
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MPEG_BIT_RATE_160000 |
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MPEG_BIT_RATE_128000 |
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MPEG_BIT_RATE_112000 |
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MPEG_BIT_RATE_96000 |
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MPEG_BIT_RATE_80000 |
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MPEG_BIT_RATE_64000 |
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MPEG_BIT_RATE_56000 |
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MPEG_BIT_RATE_48000 |
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MPEG_BIT_RATE_40000 |
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MPEG_BIT_RATE_32000 |
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MPEG_BIT_RATE_FREE,
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};
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#endif
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extern struct a2dp_codec a2dp_codec_sbc;
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extern struct a2dp_codec a2dp_codec_sbc_xq;
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#if ENABLE_LDAC
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extern struct a2dp_codec a2dp_codec_ldac;
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#endif
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#if ENABLE_AAC
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extern struct a2dp_codec a2dp_codec_aac;
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#endif
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#if ENABLE_MP3
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extern struct a2dp_codec a2dp_codec_mpeg;
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#endif
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#if ENABLE_APTX
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extern struct a2dp_codec a2dp_codec_aptx;
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extern struct a2dp_codec a2dp_codec_aptx_hd;
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extern struct a2dp_codec a2dp_codec_aptx_ll_0;
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extern struct a2dp_codec a2dp_codec_aptx_ll_1;
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#endif
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static const struct a2dp_codec * const a2dp_codec_list[] = {
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#if ENABLE_LDAC
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&a2dp_codec_ldac,
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#endif
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#if ENABLE_APTX
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&a2dp_codec_aptx_hd,
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&a2dp_codec_aptx,
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#endif
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#if ENABLE_AAC
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&a2dp_codec_aac,
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#endif
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#if ENABLE_MP3
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&a2dp_codec_mpeg,
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#endif
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&a2dp_codec_sbc,
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&a2dp_codec_sbc_xq,
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#if ENABLE_APTX
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&a2dp_codec_aptx_ll_0,
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&a2dp_codec_aptx_ll_1,
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#endif
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NULL
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};
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const struct a2dp_codec * const * const a2dp_codecs = a2dp_codec_list;
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