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bluetooth: Add a generic GStreamer codec module

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This adds a generic gstreamer codec module based on which other
bluetooth codecs viz. aptX, aptX-HD, LDAC and AAC can be supported.

The GStreamer codec plugins used here themselves depend on the native
codec implementation.

aptX/aptX-HD -> libopenaptx
LDAC         -> libldac
AAC          -> Fraunhofer FDK AAC

Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/440>
This commit is contained in:
Sanchayan Maity 2020-10-27 16:58:21 +05:30
parent 3447335da9
commit a407e9aafa
5 changed files with 828 additions and 1 deletions
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60
src/modules/bluetooth/a2dp-codec-gst.h Normal file
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/***
This file is part of PulseAudio.
Copyright (C) 2020 Asymptotic <sanchayan@asymptotic.io>
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/>.
***/
#include <gst/gst.h>
#include <gst/app/gstappsrc.h>
#include <gst/app/gstappsink.h>
#include <gst/base/gstadapter.h>
#include <pulsecore/fdsem.h>
enum a2dp_codec_type {
AAC = 0,
APTX,
APTX_HD,
LDAC_EQMID_HQ,
LDAC_EQMID_SQ,
LDAC_EQMID_MQ
};
struct gst_info {
pa_sample_spec *ss;
enum a2dp_codec_type codec_type;
union {
const a2dp_aac_t *aac_config;
const a2dp_aptx_t *aptx_config;
const a2dp_aptx_hd_t *aptx_hd_config;
const a2dp_ldac_t *ldac_config;
} a2dp_codec_t;
GstElement *gst_enc, *gst_dec;
GstElement *enc_src, *enc_sink;
GstElement *dec_src, *dec_sink;
GstElement *enc_pipeline, *dec_pipeline;
GstAdapter *enc_adapter, *dec_adapter;
pa_fdsem *enc_fdsem;
pa_fdsem *dec_fdsem;
uint16_t seq_num;
};
void *gst_codec_init(enum a2dp_codec_type codec_type, const uint8_t *config_buffer, uint8_t config_size, pa_sample_spec *ss);
size_t gst_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);
size_t gst_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);
void gst_codec_deinit(void *codec_info);