/*
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* Copyright 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "a2dp_vendor_aptx_hd_encoder"
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#include "a2dp_vendor_aptx_hd_encoder.h"
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#include <dlfcn.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <string.h>
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#include "a2dp_vendor.h"
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#include "a2dp_vendor_aptx_hd.h"
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#include "bt_common.h"
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#include "common/time_util.h"
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#include "osi/include/log.h"
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#include "osi/include/osi.h"
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//
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// Encoder for aptX-HD Source Codec
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//
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//
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// The aptX-HD encoder shared library, and the functions to use
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//
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static const char* APTX_HD_ENCODER_LIB_NAME = "libaptXHD_encoder.so";
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static void* aptx_hd_encoder_lib_handle = NULL;
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static const char* APTX_HD_ENCODER_INIT_NAME = "aptxhdbtenc_init";
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typedef int (*tAPTX_HD_ENCODER_INIT)(void* state, short endian);
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static const char* APTX_HD_ENCODER_ENCODE_STEREO_NAME =
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"aptxhdbtenc_encodestereo";
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typedef int (*tAPTX_HD_ENCODER_ENCODE_STEREO)(void* state, void* pcmL,
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void* pcmR, void* buffer);
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static const char* APTX_HD_ENCODER_SIZEOF_PARAMS_NAME = "SizeofAptxhdbtenc";
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typedef int (*tAPTX_HD_ENCODER_SIZEOF_PARAMS)(void);
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static tAPTX_HD_ENCODER_INIT aptx_hd_encoder_init_func;
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static tAPTX_HD_ENCODER_ENCODE_STEREO aptx_hd_encoder_encode_stereo_func;
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static tAPTX_HD_ENCODER_SIZEOF_PARAMS aptx_hd_encoder_sizeof_params_func;
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// offset
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#if (BTA_AV_CO_CP_SCMS_T == TRUE)
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#define A2DP_APTX_HD_OFFSET (AVDT_MEDIA_OFFSET + 1)
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#else
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#define A2DP_APTX_HD_OFFSET AVDT_MEDIA_OFFSET
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#endif
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#define A2DP_APTX_HD_MAX_PCM_BYTES_PER_READ 4096
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typedef struct {
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uint64_t sleep_time_ns;
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uint32_t pcm_reads;
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uint32_t pcm_bytes_per_read;
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uint32_t aptx_hd_bytes;
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uint32_t frame_size_counter;
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} tAPTX_HD_FRAMING_PARAMS;
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typedef struct {
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uint64_t session_start_us;
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size_t media_read_total_expected_packets;
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size_t media_read_total_expected_reads_count;
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size_t media_read_total_expected_read_bytes;
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size_t media_read_total_dropped_packets;
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size_t media_read_total_actual_reads_count;
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size_t media_read_total_actual_read_bytes;
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} a2dp_aptx_hd_encoder_stats_t;
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typedef struct {
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a2dp_source_read_callback_t read_callback;
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a2dp_source_enqueue_callback_t enqueue_callback;
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bool use_SCMS_T;
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bool is_peer_edr; // True if the peer device supports EDR
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bool peer_supports_3mbps; // True if the peer device supports 3Mbps EDR
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uint16_t peer_mtu; // MTU of the A2DP peer
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uint32_t timestamp; // Timestamp for the A2DP frames
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tA2DP_FEEDING_PARAMS feeding_params;
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tAPTX_HD_FRAMING_PARAMS framing_params;
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void* aptx_hd_encoder_state;
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a2dp_aptx_hd_encoder_stats_t stats;
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} tA2DP_APTX_HD_ENCODER_CB;
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static tA2DP_APTX_HD_ENCODER_CB a2dp_aptx_hd_encoder_cb;
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static void a2dp_vendor_aptx_hd_encoder_update(
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uint16_t peer_mtu, A2dpCodecConfig* a2dp_codec_config,
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bool* p_restart_input, bool* p_restart_output, bool* p_config_updated);
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static void aptx_hd_init_framing_params(
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tAPTX_HD_FRAMING_PARAMS* framing_params);
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static void aptx_hd_update_framing_params(
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tAPTX_HD_FRAMING_PARAMS* framing_params);
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static size_t aptx_hd_encode_24bit(tAPTX_HD_FRAMING_PARAMS* framing_params,
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size_t* data_out_index, uint32_t* data32_in,
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uint8_t* data_out);
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bool A2DP_VendorLoadEncoderAptxHd(void) {
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if (aptx_hd_encoder_lib_handle != NULL) return true; // Already loaded
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// Open the encoder library
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aptx_hd_encoder_lib_handle = dlopen(APTX_HD_ENCODER_LIB_NAME, RTLD_NOW);
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if (aptx_hd_encoder_lib_handle == NULL) {
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LOG_ERROR(LOG_TAG, "%s: cannot open aptX-HD encoder library %s: %s",
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__func__, APTX_HD_ENCODER_LIB_NAME, dlerror());
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return false;
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}
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aptx_hd_encoder_init_func = (tAPTX_HD_ENCODER_INIT)dlsym(
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aptx_hd_encoder_lib_handle, APTX_HD_ENCODER_INIT_NAME);
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if (aptx_hd_encoder_init_func == NULL) {
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LOG_ERROR(LOG_TAG,
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"%s: cannot find function '%s' in the encoder library: %s",
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__func__, APTX_HD_ENCODER_INIT_NAME, dlerror());
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A2DP_VendorUnloadEncoderAptxHd();
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return false;
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}
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aptx_hd_encoder_encode_stereo_func = (tAPTX_HD_ENCODER_ENCODE_STEREO)dlsym(
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aptx_hd_encoder_lib_handle, APTX_HD_ENCODER_ENCODE_STEREO_NAME);
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if (aptx_hd_encoder_encode_stereo_func == NULL) {
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LOG_ERROR(LOG_TAG,
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"%s: cannot find function '%s' in the encoder library: %s",
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__func__, APTX_HD_ENCODER_ENCODE_STEREO_NAME, dlerror());
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A2DP_VendorUnloadEncoderAptxHd();
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return false;
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}
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aptx_hd_encoder_sizeof_params_func = (tAPTX_HD_ENCODER_SIZEOF_PARAMS)dlsym(
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aptx_hd_encoder_lib_handle, APTX_HD_ENCODER_SIZEOF_PARAMS_NAME);
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if (aptx_hd_encoder_sizeof_params_func == NULL) {
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LOG_ERROR(LOG_TAG,
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"%s: cannot find function '%s' in the encoder library: %s",
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__func__, APTX_HD_ENCODER_SIZEOF_PARAMS_NAME, dlerror());
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A2DP_VendorUnloadEncoderAptxHd();
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return false;
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}
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return true;
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}
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void A2DP_VendorUnloadEncoderAptxHd(void) {
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aptx_hd_encoder_init_func = NULL;
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aptx_hd_encoder_encode_stereo_func = NULL;
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aptx_hd_encoder_sizeof_params_func = NULL;
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if (aptx_hd_encoder_lib_handle != NULL) {
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dlclose(aptx_hd_encoder_lib_handle);
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aptx_hd_encoder_lib_handle = NULL;
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}
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}
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void a2dp_vendor_aptx_hd_encoder_init(
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const tA2DP_ENCODER_INIT_PEER_PARAMS* p_peer_params,
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A2dpCodecConfig* a2dp_codec_config,
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a2dp_source_read_callback_t read_callback,
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a2dp_source_enqueue_callback_t enqueue_callback) {
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memset(&a2dp_aptx_hd_encoder_cb, 0, sizeof(a2dp_aptx_hd_encoder_cb));
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a2dp_aptx_hd_encoder_cb.stats.session_start_us =
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bluetooth::common::time_get_os_boottime_us();
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a2dp_aptx_hd_encoder_cb.read_callback = read_callback;
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a2dp_aptx_hd_encoder_cb.enqueue_callback = enqueue_callback;
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a2dp_aptx_hd_encoder_cb.is_peer_edr = p_peer_params->is_peer_edr;
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a2dp_aptx_hd_encoder_cb.peer_supports_3mbps =
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p_peer_params->peer_supports_3mbps;
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a2dp_aptx_hd_encoder_cb.peer_mtu = p_peer_params->peer_mtu;
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a2dp_aptx_hd_encoder_cb.timestamp = 0;
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/* aptX-HD encoder config */
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a2dp_aptx_hd_encoder_cb.use_SCMS_T = false; // TODO: should be a parameter
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#if (BTA_AV_CO_CP_SCMS_T == TRUE)
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a2dp_aptx_hd_encoder_cb.use_SCMS_T = true;
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#endif
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a2dp_aptx_hd_encoder_cb.aptx_hd_encoder_state =
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osi_malloc(aptx_hd_encoder_sizeof_params_func());
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if (a2dp_aptx_hd_encoder_cb.aptx_hd_encoder_state != NULL) {
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aptx_hd_encoder_init_func(a2dp_aptx_hd_encoder_cb.aptx_hd_encoder_state, 0);
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} else {
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LOG_ERROR(LOG_TAG, "%s: Cannot allocate aptX-HD encoder state", __func__);
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// TODO: Return an error?
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}
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// NOTE: Ignore the restart_input / restart_output flags - this initization
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// happens when the connection is (re)started.
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bool restart_input = false;
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bool restart_output = false;
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bool config_updated = false;
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a2dp_vendor_aptx_hd_encoder_update(a2dp_aptx_hd_encoder_cb.peer_mtu,
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a2dp_codec_config, &restart_input,
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&restart_output, &config_updated);
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}
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bool A2dpCodecConfigAptxHd::updateEncoderUserConfig(
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const tA2DP_ENCODER_INIT_PEER_PARAMS* p_peer_params, bool* p_restart_input,
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bool* p_restart_output, bool* p_config_updated) {
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a2dp_aptx_hd_encoder_cb.is_peer_edr = p_peer_params->is_peer_edr;
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a2dp_aptx_hd_encoder_cb.peer_supports_3mbps =
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p_peer_params->peer_supports_3mbps;
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a2dp_aptx_hd_encoder_cb.peer_mtu = p_peer_params->peer_mtu;
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a2dp_aptx_hd_encoder_cb.timestamp = 0;
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if (a2dp_aptx_hd_encoder_cb.peer_mtu == 0) {
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LOG_ERROR(LOG_TAG,
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"%s: Cannot update the codec encoder for %s: "
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"invalid peer MTU",
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__func__, name().c_str());
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return false;
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}
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a2dp_vendor_aptx_hd_encoder_update(a2dp_aptx_hd_encoder_cb.peer_mtu, this,
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p_restart_input, p_restart_output,
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p_config_updated);
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return true;
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}
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// Update the A2DP aptX-HD encoder.
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// |peer_mtu| is the peer MTU.
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// |a2dp_codec_config| is the A2DP codec to use for the update.
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static void a2dp_vendor_aptx_hd_encoder_update(
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uint16_t peer_mtu, A2dpCodecConfig* a2dp_codec_config,
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bool* p_restart_input, bool* p_restart_output, bool* p_config_updated) {
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uint8_t codec_info[AVDT_CODEC_SIZE];
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*p_restart_input = false;
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*p_restart_output = false;
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*p_config_updated = false;
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if (!a2dp_codec_config->copyOutOtaCodecConfig(codec_info)) {
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LOG_ERROR(LOG_TAG,
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"%s: Cannot update the codec encoder for %s: "
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"invalid codec config",
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__func__, a2dp_codec_config->name().c_str());
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return;
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}
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const uint8_t* p_codec_info = codec_info;
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// The feeding parameters
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tA2DP_FEEDING_PARAMS* p_feeding_params =
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&a2dp_aptx_hd_encoder_cb.feeding_params;
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p_feeding_params->sample_rate =
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A2DP_VendorGetTrackSampleRateAptxHd(p_codec_info);
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p_feeding_params->bits_per_sample =
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a2dp_codec_config->getAudioBitsPerSample();
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p_feeding_params->channel_count =
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A2DP_VendorGetTrackChannelCountAptxHd(p_codec_info);
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LOG_DEBUG(LOG_TAG, "%s: sample_rate=%u bits_per_sample=%u channel_count=%u",
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__func__, p_feeding_params->sample_rate,
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p_feeding_params->bits_per_sample, p_feeding_params->channel_count);
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a2dp_vendor_aptx_hd_feeding_reset();
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}
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void a2dp_vendor_aptx_hd_encoder_cleanup(void) {
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osi_free(a2dp_aptx_hd_encoder_cb.aptx_hd_encoder_state);
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memset(&a2dp_aptx_hd_encoder_cb, 0, sizeof(a2dp_aptx_hd_encoder_cb));
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}
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//
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// Initialize the framing parameters, and set those that don't change
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// while streaming (e.g., 'sleep_time_ns').
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//
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static void aptx_hd_init_framing_params(
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tAPTX_HD_FRAMING_PARAMS* framing_params) {
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framing_params->sleep_time_ns = 0;
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framing_params->pcm_reads = 0;
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framing_params->pcm_bytes_per_read = 0;
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framing_params->aptx_hd_bytes = 0;
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framing_params->frame_size_counter = 0;
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framing_params->sleep_time_ns = 9000000;
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LOG_DEBUG(LOG_TAG, "%s: sleep_time_ns = %" PRIu64, __func__,
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framing_params->sleep_time_ns);
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}
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//
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// Set frame size and transmission interval needed to stream the required
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// sample rate using 2-DH5 packets for aptX and 2-DH3 packets for aptX-LL.
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// With SCMS-T enabled we need to reserve room for extra headers added later.
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// Packets are always sent at equals time intervals but to achieve the
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// required sample rate, the frame size needs to change on occasion.
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//
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// Also need to specify how many of the required PCM samples are read at a
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// time:
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// aptx_bytes = pcm_reads * pcm_bytes_per_read / 4
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// and
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// number of aptX samples produced = pcm_bytes_per_read / 16
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//
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static void aptx_hd_update_framing_params(
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tAPTX_HD_FRAMING_PARAMS* framing_params) {
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if (a2dp_aptx_hd_encoder_cb.feeding_params.sample_rate == 48000) {
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framing_params->aptx_hd_bytes = 648;
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framing_params->pcm_bytes_per_read = 24;
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framing_params->pcm_reads = 108;
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} else {
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// Assume the sample rate is 44100
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//
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// Total of 80 iterations:
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// - Iteration 80: packet size 648, with 108 reads of 24 PCM bytes
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// - Iterations 20, 40, 60: packet size 612, with 102 reads of 24 PCM bytes
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// - All other iterations: packet size 594, with 99 reads of 24 PCM bytes
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//
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if (framing_params->frame_size_counter + 1 == 80) {
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framing_params->aptx_hd_bytes = 648;
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framing_params->pcm_bytes_per_read = 24;
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framing_params->pcm_reads = 108;
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} else if (((framing_params->frame_size_counter + 1) % 20) == 0) {
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framing_params->aptx_hd_bytes = 612;
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framing_params->pcm_bytes_per_read = 24;
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framing_params->pcm_reads = 102;
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} else {
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framing_params->aptx_hd_bytes = 594;
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framing_params->pcm_bytes_per_read = 24;
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framing_params->pcm_reads = 99;
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}
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framing_params->frame_size_counter++;
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if (framing_params->frame_size_counter == 80)
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framing_params->frame_size_counter = 0;
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}
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LOG_VERBOSE(LOG_TAG,
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"%s: sleep_time_ns = %" PRIu64
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" aptx_hd_bytes = %u "
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"pcm_bytes_per_read = %u pcm_reads = %u frame_size_counter = %u",
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__func__, framing_params->sleep_time_ns,
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framing_params->aptx_hd_bytes, framing_params->pcm_bytes_per_read,
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framing_params->pcm_reads, framing_params->frame_size_counter);
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}
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void a2dp_vendor_aptx_hd_feeding_reset(void) {
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aptx_hd_init_framing_params(&a2dp_aptx_hd_encoder_cb.framing_params);
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}
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void a2dp_vendor_aptx_hd_feeding_flush(void) {
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aptx_hd_init_framing_params(&a2dp_aptx_hd_encoder_cb.framing_params);
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}
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uint64_t a2dp_vendor_aptx_hd_get_encoder_interval_ms(void) {
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return a2dp_aptx_hd_encoder_cb.framing_params.sleep_time_ns / (1000 * 1000);
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}
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void a2dp_vendor_aptx_hd_send_frames(uint64_t timestamp_us) {
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tAPTX_HD_FRAMING_PARAMS* framing_params =
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&a2dp_aptx_hd_encoder_cb.framing_params;
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// Prepare the packet to send
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BT_HDR* p_buf = (BT_HDR*)osi_malloc(BT_DEFAULT_BUFFER_SIZE);
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p_buf->offset = A2DP_APTX_HD_OFFSET;
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p_buf->len = 0;
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p_buf->layer_specific = 0;
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uint8_t* encoded_ptr = (uint8_t*)(p_buf + 1);
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encoded_ptr += p_buf->offset;
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aptx_hd_update_framing_params(framing_params);
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//
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// Read the PCM data and encode it
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//
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uint32_t
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read_buffer32[A2DP_APTX_HD_MAX_PCM_BYTES_PER_READ / sizeof(uint32_t)];
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uint32_t expected_read_bytes =
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framing_params->pcm_reads * framing_params->pcm_bytes_per_read;
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size_t encoded_ptr_index = 0;
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size_t pcm_bytes_encoded = 0;
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uint32_t bytes_read = 0;
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a2dp_aptx_hd_encoder_cb.stats.media_read_total_expected_packets++;
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a2dp_aptx_hd_encoder_cb.stats.media_read_total_expected_reads_count++;
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a2dp_aptx_hd_encoder_cb.stats.media_read_total_expected_read_bytes +=
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expected_read_bytes;
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LOG_VERBOSE(LOG_TAG, "%s: PCM read of size %u", __func__,
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expected_read_bytes);
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bytes_read = a2dp_aptx_hd_encoder_cb.read_callback((uint8_t*)read_buffer32,
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expected_read_bytes);
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a2dp_aptx_hd_encoder_cb.stats.media_read_total_actual_read_bytes +=
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bytes_read;
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if (bytes_read < expected_read_bytes) {
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LOG_WARN(LOG_TAG,
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"%s: underflow at PCM reading: read %u bytes instead of %u",
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__func__, bytes_read, expected_read_bytes);
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a2dp_aptx_hd_encoder_cb.stats.media_read_total_dropped_packets++;
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osi_free(p_buf);
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return;
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}
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a2dp_aptx_hd_encoder_cb.stats.media_read_total_actual_reads_count++;
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for (uint32_t reads = 0, offset = 0; reads < framing_params->pcm_reads;
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reads++, offset +=
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framing_params->pcm_bytes_per_read / sizeof(uint32_t)) {
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pcm_bytes_encoded +=
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aptx_hd_encode_24bit(framing_params, &encoded_ptr_index,
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read_buffer32 + offset, encoded_ptr);
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}
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// Compute the number of encoded bytes
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const int COMPRESSION_RATIO = 4;
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size_t encoded_bytes = pcm_bytes_encoded / COMPRESSION_RATIO;
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p_buf->len += encoded_bytes;
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LOG_VERBOSE(LOG_TAG, "%s: encoded %zu PCM bytes to %zu", __func__,
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pcm_bytes_encoded, encoded_bytes);
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// Update the RTP timestamp
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*((uint32_t*)(p_buf + 1)) = a2dp_aptx_hd_encoder_cb.timestamp;
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const uint8_t BYTES_PER_FRAME = 3;
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uint32_t rtp_timestamp =
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(pcm_bytes_encoded /
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a2dp_aptx_hd_encoder_cb.feeding_params.channel_count) /
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BYTES_PER_FRAME;
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a2dp_aptx_hd_encoder_cb.timestamp += rtp_timestamp;
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if (p_buf->len > 0) {
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a2dp_aptx_hd_encoder_cb.enqueue_callback(p_buf, 1, bytes_read);
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} else {
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a2dp_aptx_hd_encoder_cb.stats.media_read_total_dropped_packets++;
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osi_free(p_buf);
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}
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}
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static size_t aptx_hd_encode_24bit(tAPTX_HD_FRAMING_PARAMS* framing_params,
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size_t* data_out_index, uint32_t* data32_in,
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uint8_t* data_out) {
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size_t pcm_bytes_encoded = 0;
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const uint8_t* p = (const uint8_t*)(data32_in);
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for (size_t aptx_hd_samples = 0;
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aptx_hd_samples < framing_params->pcm_bytes_per_read / 24;
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aptx_hd_samples++) {
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uint32_t pcmL[4];
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uint32_t pcmR[4];
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uint32_t encoded_sample[2];
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// Expand from AUDIO_FORMAT_PCM_24_BIT_PACKED data (3 bytes per sample)
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// into AUDIO_FORMAT_PCM_8_24_BIT (4 bytes per sample).
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for (size_t i = 0; i < 4; i++) {
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pcmL[i] = ((p[0] << 0) | (p[1] << 8) | (((int8_t)p[2]) << 16));
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p += 3;
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pcmR[i] = ((p[0] << 0) | (p[1] << 8) | (((int8_t)p[2]) << 16));
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p += 3;
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}
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aptx_hd_encoder_encode_stereo_func(
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a2dp_aptx_hd_encoder_cb.aptx_hd_encoder_state, &pcmL, &pcmR,
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&encoded_sample);
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uint8_t* encoded_ptr = (uint8_t*)&encoded_sample[0];
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data_out[*data_out_index + 0] = *(encoded_ptr + 2);
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data_out[*data_out_index + 1] = *(encoded_ptr + 1);
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data_out[*data_out_index + 2] = *(encoded_ptr + 0);
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data_out[*data_out_index + 3] = *(encoded_ptr + 6);
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data_out[*data_out_index + 4] = *(encoded_ptr + 5);
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data_out[*data_out_index + 5] = *(encoded_ptr + 4);
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pcm_bytes_encoded += 24;
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*data_out_index += 6;
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}
|
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return pcm_bytes_encoded;
|
}
|
|
uint64_t A2dpCodecConfigAptxHd::encoderIntervalMs() const {
|
return a2dp_vendor_aptx_hd_get_encoder_interval_ms();
|
}
|
|
int A2dpCodecConfigAptxHd::getEffectiveMtu() const {
|
return a2dp_aptx_hd_encoder_cb.peer_mtu;
|
}
|
|
void A2dpCodecConfigAptxHd::debug_codec_dump(int fd) {
|
a2dp_aptx_hd_encoder_stats_t* stats = &a2dp_aptx_hd_encoder_cb.stats;
|
|
A2dpCodecConfig::debug_codec_dump(fd);
|
|
dprintf(fd,
|
" Packet counts (expected/dropped) : %zu / "
|
"%zu\n",
|
stats->media_read_total_expected_packets,
|
stats->media_read_total_dropped_packets);
|
|
dprintf(fd,
|
" PCM read counts (expected/actual) : %zu / "
|
"%zu\n",
|
stats->media_read_total_expected_reads_count,
|
stats->media_read_total_actual_reads_count);
|
|
dprintf(fd,
|
" PCM read bytes (expected/actual) : %zu / "
|
"%zu\n",
|
stats->media_read_total_expected_read_bytes,
|
stats->media_read_total_actual_read_bytes);
|
}
|
