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PL286/system/bt/stack/a2dp/a2dp_aac_encoder.cc

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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "a2dp_aac_encoder"
#include "a2dp_aac_encoder.h"
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include <aacenc_lib.h>
#include <base/logging.h>
#include "a2dp_aac.h"
#include "bt_common.h"
#include "osi/include/log.h"
#include "osi/include/osi.h"
//
// Encoder for AAC Source Codec
//
// A2DP AAC encoder interval in milliseconds
#define A2DP_AAC_ENCODER_INTERVAL_MS 20
/*
* 2DH5 payload size of:
* 679 bytes - (4 bytes L2CAP Header + 12 bytes AVDTP Header)
*/
#define MAX_2MBPS_AVDTP_MTU 663
// offset
#if (BTA_AV_CO_CP_SCMS_T == TRUE)
#define A2DP_AAC_OFFSET (AVDT_MEDIA_OFFSET + 1)
#else
#define A2DP_AAC_OFFSET AVDT_MEDIA_OFFSET
#endif
typedef struct {
uint32_t sample_rate;
uint8_t channel_mode;
uint8_t bits_per_sample;
uint32_t frame_length; // Samples per channel in a frame
uint8_t input_channels_n; // Number of channels
int max_encoded_buffer_bytes; // Max encoded bytes per frame
} tA2DP_AAC_ENCODER_PARAMS;
typedef struct {
uint32_t counter;
uint32_t bytes_per_tick; /* pcm bytes read each media task tick */
uint64_t last_frame_us;
} tA2DP_AAC_FEEDING_STATE;
typedef struct {
uint64_t session_start_us;
size_t media_read_total_expected_packets;
size_t media_read_total_expected_reads_count;
size_t media_read_total_expected_read_bytes;
size_t media_read_total_dropped_packets;
size_t media_read_total_actual_reads_count;
size_t media_read_total_actual_read_bytes;
} a2dp_aac_encoder_stats_t;
typedef struct {
a2dp_source_read_callback_t read_callback;
a2dp_source_enqueue_callback_t enqueue_callback;
uint16_t TxAaMtuSize;
bool use_SCMS_T;
bool is_peer_edr; // True if the peer device supports EDR
bool peer_supports_3mbps; // True if the peer device supports 3Mbps EDR
uint16_t peer_mtu; // MTU of the A2DP peer
uint32_t timestamp; // Timestamp for the A2DP frames
HANDLE_AACENCODER aac_handle;
bool has_aac_handle; // True if aac_handle is valid
tA2DP_FEEDING_PARAMS feeding_params;
tA2DP_AAC_ENCODER_PARAMS aac_encoder_params;
tA2DP_AAC_FEEDING_STATE aac_feeding_state;
a2dp_aac_encoder_stats_t stats;
} tA2DP_AAC_ENCODER_CB;
static tA2DP_AAC_ENCODER_CB a2dp_aac_encoder_cb;
static void a2dp_aac_encoder_update(uint16_t peer_mtu,
A2dpCodecConfig* a2dp_codec_config,
bool* p_restart_input,
bool* p_restart_output,
bool* p_config_updated);
static void a2dp_aac_get_num_frame_iteration(uint8_t* num_of_iterations,
uint8_t* num_of_frames,
uint64_t timestamp_us);
static void a2dp_aac_encode_frames(uint8_t nb_frame);
static bool a2dp_aac_read_feeding(uint8_t* read_buffer);
bool A2DP_LoadEncoderAac(void) {
// Nothing to do - the library is statically linked
return true;
}
void A2DP_UnloadEncoderAac(void) {
// Nothing to do - the library is statically linked
if (a2dp_aac_encoder_cb.has_aac_handle)
aacEncClose(&a2dp_aac_encoder_cb.aac_handle);
memset(&a2dp_aac_encoder_cb, 0, sizeof(a2dp_aac_encoder_cb));
}
void a2dp_aac_encoder_init(const tA2DP_ENCODER_INIT_PEER_PARAMS* p_peer_params,
A2dpCodecConfig* a2dp_codec_config,
a2dp_source_read_callback_t read_callback,
a2dp_source_enqueue_callback_t enqueue_callback) {
if (a2dp_aac_encoder_cb.has_aac_handle)
aacEncClose(&a2dp_aac_encoder_cb.aac_handle);
memset(&a2dp_aac_encoder_cb, 0, sizeof(a2dp_aac_encoder_cb));
a2dp_aac_encoder_cb.stats.session_start_us = time_get_os_boottime_us();
a2dp_aac_encoder_cb.read_callback = read_callback;
a2dp_aac_encoder_cb.enqueue_callback = enqueue_callback;
a2dp_aac_encoder_cb.is_peer_edr = p_peer_params->is_peer_edr;
a2dp_aac_encoder_cb.peer_supports_3mbps = p_peer_params->peer_supports_3mbps;
a2dp_aac_encoder_cb.peer_mtu = p_peer_params->peer_mtu;
a2dp_aac_encoder_cb.timestamp = 0;
a2dp_aac_encoder_cb.use_SCMS_T = false; // TODO: should be a parameter
#if (BTA_AV_CO_CP_SCMS_T == TRUE)
a2dp_aac_encoder_cb.use_SCMS_T = true;
#endif
// NOTE: Ignore the restart_input / restart_output flags - this initization
// happens when the connection is (re)started.
bool restart_input = false;
bool restart_output = false;
bool config_updated = false;
a2dp_aac_encoder_update(a2dp_aac_encoder_cb.peer_mtu, a2dp_codec_config,
&restart_input, &restart_output, &config_updated);
}
bool A2dpCodecConfigAac::updateEncoderUserConfig(
const tA2DP_ENCODER_INIT_PEER_PARAMS* p_peer_params, bool* p_restart_input,
bool* p_restart_output, bool* p_config_updated) {
a2dp_aac_encoder_cb.is_peer_edr = p_peer_params->is_peer_edr;
a2dp_aac_encoder_cb.peer_supports_3mbps = p_peer_params->peer_supports_3mbps;
a2dp_aac_encoder_cb.peer_mtu = p_peer_params->peer_mtu;
a2dp_aac_encoder_cb.timestamp = 0;
if (a2dp_aac_encoder_cb.peer_mtu == 0) {
LOG_ERROR(LOG_TAG,
"%s: Cannot update the codec encoder for %s: "
"invalid peer MTU",
__func__, name().c_str());
return false;
}
a2dp_aac_encoder_update(a2dp_aac_encoder_cb.peer_mtu, this, p_restart_input,
p_restart_output, p_config_updated);
return true;
}
// Update the A2DP AAC encoder.
// |peer_mtu| is the peer MTU.
// |a2dp_codec_config| is the A2DP codec to use for the update.
static void a2dp_aac_encoder_update(uint16_t peer_mtu,
A2dpCodecConfig* a2dp_codec_config,
bool* p_restart_input,
bool* p_restart_output,
bool* p_config_updated) {
tA2DP_AAC_ENCODER_PARAMS* p_encoder_params =
&a2dp_aac_encoder_cb.aac_encoder_params;
uint8_t codec_info[AVDT_CODEC_SIZE];
AACENC_ERROR aac_error;
int aac_param_value, aac_sampling_freq, aac_peak_bit_rate;
*p_restart_input = false;
*p_restart_output = false;
*p_config_updated = false;
if (!a2dp_aac_encoder_cb.has_aac_handle) {
AACENC_ERROR aac_error = aacEncOpen(&a2dp_aac_encoder_cb.aac_handle, 0,
2 /* max 2 channels: stereo */);
if (aac_error != AACENC_OK) {
LOG_ERROR(LOG_TAG, "%s: Cannot open AAC encoder handle: AAC error 0x%x",
__func__, aac_error);
return; // TODO: Return an error?
}
a2dp_aac_encoder_cb.has_aac_handle = true;
}
if (!a2dp_codec_config->copyOutOtaCodecConfig(codec_info)) {
LOG_ERROR(LOG_TAG,
"%s: Cannot update the codec encoder for %s: "
"invalid codec config",
__func__, a2dp_codec_config->name().c_str());
return;
}
const uint8_t* p_codec_info = codec_info;
// The feeding parameters
tA2DP_FEEDING_PARAMS* p_feeding_params = &a2dp_aac_encoder_cb.feeding_params;
p_feeding_params->sample_rate = A2DP_GetTrackSampleRateAac(p_codec_info);
p_feeding_params->bits_per_sample =
a2dp_codec_config->getAudioBitsPerSample();
p_feeding_params->channel_count = A2DP_GetTrackChannelCountAac(p_codec_info);
LOG_DEBUG(LOG_TAG, "%s: sample_rate=%u bits_per_sample=%u channel_count=%u",
__func__, p_feeding_params->sample_rate,
p_feeding_params->bits_per_sample, p_feeding_params->channel_count);
// The codec parameters
p_encoder_params->sample_rate =
a2dp_aac_encoder_cb.feeding_params.sample_rate;
p_encoder_params->channel_mode = A2DP_GetChannelModeCodeAac(p_codec_info);
LOG_VERBOSE(LOG_TAG, "%s: original AVDTP MTU size: %d", __func__,
a2dp_aac_encoder_cb.TxAaMtuSize);
if (a2dp_aac_encoder_cb.is_peer_edr &&
!a2dp_aac_encoder_cb.peer_supports_3mbps) {
// This condition would be satisfied only if the remote device is
// EDR and supports only 2 Mbps, but the effective AVDTP MTU size
// exceeds the 2DH5 packet size.
LOG_VERBOSE(LOG_TAG,
"%s: The remote device is EDR but does not support 3 Mbps",
__func__);
if (peer_mtu > MAX_2MBPS_AVDTP_MTU) {
LOG_WARN(LOG_TAG, "%s: Restricting AVDTP MTU size from %d to %d",
__func__, peer_mtu, MAX_2MBPS_AVDTP_MTU);
peer_mtu = MAX_2MBPS_AVDTP_MTU;
}
}
uint16_t mtu_size = BT_DEFAULT_BUFFER_SIZE - A2DP_AAC_OFFSET - sizeof(BT_HDR);
if (mtu_size < peer_mtu) {
a2dp_aac_encoder_cb.TxAaMtuSize = mtu_size;
} else {
a2dp_aac_encoder_cb.TxAaMtuSize = peer_mtu;
}
LOG_DEBUG(LOG_TAG, "%s: MTU=%d, peer_mtu=%d", __func__,
a2dp_aac_encoder_cb.TxAaMtuSize, peer_mtu);
LOG_DEBUG(LOG_TAG, "%s: sample_rate: %d channel_mode: %d ", __func__,
p_encoder_params->sample_rate, p_encoder_params->channel_mode);
// Set the encoder's parameters: Audio Object Type - MANDATORY
// A2DP_AAC_OBJECT_TYPE_MPEG2_LC -> AOT_AAC_LC
// A2DP_AAC_OBJECT_TYPE_MPEG4_LC -> AOT_AAC_LC
// A2DP_AAC_OBJECT_TYPE_MPEG4_LTP -> AOT_AAC_LTP
// A2DP_AAC_OBJECT_TYPE_MPEG4_SCALABLE -> AOT_AAC_SCAL
aac_param_value = AOT_AAC_LC;
int object_type = A2DP_GetObjectTypeCodeAac(p_codec_info);
switch (object_type) {
case A2DP_AAC_OBJECT_TYPE_MPEG2_LC:
aac_param_value = AOT_AAC_LC;
break;
case A2DP_AAC_OBJECT_TYPE_MPEG4_LC:
aac_param_value = AOT_AAC_LC;
break;
case A2DP_AAC_OBJECT_TYPE_MPEG4_LTP:
aac_param_value = AOT_AAC_LTP;
break;
case A2DP_AAC_OBJECT_TYPE_MPEG4_SCALABLE:
aac_param_value = AOT_AAC_SCAL;
break;
default:
LOG_ERROR(LOG_TAG,
"%s: Cannot set AAC parameter AACENC_AOT: "
"invalid object type %d",
__func__, object_type);
return; // TODO: Return an error?
}
aac_error = aacEncoder_SetParam(a2dp_aac_encoder_cb.aac_handle, AACENC_AOT,
aac_param_value);
if (aac_error != AACENC_OK) {
LOG_ERROR(LOG_TAG,
"%s: Cannot set AAC parameter AACENC_AOT to %d: "
"AAC error 0x%x",
__func__, aac_param_value, aac_error);
return; // TODO: Return an error?
}
// Set the encoder's parameters: audioMuxVersion
aac_param_value = 2; // audioMuxVersion = "2"
aac_error = aacEncoder_SetParam(a2dp_aac_encoder_cb.aac_handle,
AACENC_AUDIOMUXVER, aac_param_value);
if (aac_error != AACENC_OK) {
LOG_ERROR(LOG_TAG,
"%s: Cannot set AAC parameter AACENC_AUDIOMUXVER to %d: "
"AAC error 0x%x",
__func__, aac_param_value, aac_error);
return; // TODO: Return an error?
}
// Set the encoder's parameters: Signaling mode of the extension AOT
aac_param_value = 1; // Signaling mode of the extension AOT = 1
aac_error = aacEncoder_SetParam(a2dp_aac_encoder_cb.aac_handle,
AACENC_SIGNALING_MODE, aac_param_value);
if (aac_error != AACENC_OK) {
LOG_ERROR(LOG_TAG,
"%s: Cannot set AAC parameter AACENC_SIGNALING_MODE to %d: "
"AAC error 0x%x",
__func__, aac_param_value, aac_error);
return; // TODO: Return an error?
}
// Set the encoder's parameters: Sample Rate - MANDATORY
aac_param_value = A2DP_GetTrackSampleRateAac(p_codec_info);
aac_error = aacEncoder_SetParam(a2dp_aac_encoder_cb.aac_handle,
AACENC_SAMPLERATE, aac_param_value);
if (aac_error != AACENC_OK) {
LOG_ERROR(LOG_TAG,
"%s: Cannot set AAC parameter AACENC_SAMPLERATE to %d: "
"AAC error 0x%x",
__func__, aac_param_value, aac_error);
return; // TODO: Return an error?
}
aac_sampling_freq = aac_param_value; // Save for extra usage below
// Set the encoder's parameters: Bit Rate - MANDATORY
aac_param_value = A2DP_GetBitRateAac(p_codec_info);
// Calculate the bit rate from MTU and sampling frequency
aac_peak_bit_rate =
A2DP_ComputeMaxBitRateAac(p_codec_info, a2dp_aac_encoder_cb.TxAaMtuSize);
aac_param_value = std::min(aac_param_value, aac_peak_bit_rate);
LOG_DEBUG(LOG_TAG, "%s: MTU = %d Sampling Frequency = %d Bit Rate = %d",
__func__, a2dp_aac_encoder_cb.TxAaMtuSize, aac_sampling_freq,
aac_param_value);
if (aac_param_value == -1) {
LOG_ERROR(LOG_TAG,
"%s: Cannot set AAC parameter AACENC_BITRATE: "
"invalid codec bit rate",
__func__);
return; // TODO: Return an error?
}
aac_error = aacEncoder_SetParam(a2dp_aac_encoder_cb.aac_handle,
AACENC_BITRATE, aac_param_value);
if (aac_error != AACENC_OK) {
LOG_ERROR(LOG_TAG,
"%s: Cannot set AAC parameter AACENC_BITRATE to %d: "
"AAC error 0x%x",
__func__, aac_param_value, aac_error);
return; // TODO: Return an error?
}
// Set the encoder's parameters: PEAK Bit Rate
aac_error = aacEncoder_SetParam(a2dp_aac_encoder_cb.aac_handle,
AACENC_PEAK_BITRATE, aac_peak_bit_rate);
if (aac_error != AACENC_OK) {
LOG_ERROR(LOG_TAG,
"%s: Cannot set AAC parameter AACENC_PEAK_BITRATE to %d: "
"AAC error 0x%x",
__func__, aac_peak_bit_rate, aac_error);
return; // TODO: Return an error?
}
// Set the encoder's parameters: Channel Mode - MANDATORY
if (A2DP_GetTrackChannelCountAac(p_codec_info) == 1) {
aac_param_value = MODE_1; // Mono
} else {
aac_param_value = MODE_2; // Stereo
}
aac_error = aacEncoder_SetParam(a2dp_aac_encoder_cb.aac_handle,
AACENC_CHANNELMODE, aac_param_value);
if (aac_error != AACENC_OK) {
LOG_ERROR(LOG_TAG,
"%s: Cannot set AAC parameter AACENC_CHANNELMODE to %d: "
"AAC error 0x%x",
__func__, aac_param_value, aac_error);
return; // TODO: Return an error?
}
// Set the encoder's parameters: Transport Type
aac_param_value = TT_MP4_LATM_MCP1; // muxConfigPresent = 1
aac_error = aacEncoder_SetParam(a2dp_aac_encoder_cb.aac_handle,
AACENC_TRANSMUX, aac_param_value);
if (aac_error != AACENC_OK) {
LOG_ERROR(LOG_TAG,
"%s: Cannot set AAC parameter AACENC_TRANSMUX to %d: "
"AAC error 0x%x",
__func__, aac_param_value, aac_error);
return; // TODO: Return an error?
}
// Set the encoder's parameters: Header Period
aac_param_value = 1;
aac_error = aacEncoder_SetParam(a2dp_aac_encoder_cb.aac_handle,
AACENC_HEADER_PERIOD, aac_param_value);
if (aac_error != AACENC_OK) {
LOG_ERROR(LOG_TAG,
"%s: Cannot set AAC parameter AACENC_HEADER_PERIOD to %d: "
"AAC error 0x%x",
__func__, aac_param_value, aac_error);
return; // TODO: Return an error?
}
// Set the encoder's parameters: Variable Bit Rate Support
aac_param_value = A2DP_GetVariableBitRateSupportAac(p_codec_info);
if (aac_param_value == -1) {
LOG_ERROR(LOG_TAG,
"%s: Cannot set AAC parameter AACENC_BITRATEMODE: "
"invalid codec bit rate mode",
__func__);
return; // TODO: Return an error?
}
aac_error = aacEncoder_SetParam(a2dp_aac_encoder_cb.aac_handle,
AACENC_BITRATEMODE, aac_param_value);
if (aac_error != AACENC_OK) {
LOG_ERROR(LOG_TAG,
"%s: Cannot set AAC parameter AACENC_BITRATEMODE to %d: "
"AAC error 0x%x",
__func__, aac_param_value, aac_error);
return; // TODO: Return an error?
}
// Mark the end of setting the encoder's parameters
aac_error =
aacEncEncode(a2dp_aac_encoder_cb.aac_handle, NULL, NULL, NULL, NULL);
if (aac_error != AACENC_OK) {
LOG_ERROR(LOG_TAG,
"%s: Cannot complete setting the AAC parameters: AAC error 0x%x",
__func__, aac_error);
return; // TODO: Return an error?
}
// Retrieve the encoder info so we can save the frame length
AACENC_InfoStruct aac_info;
aac_error = aacEncInfo(a2dp_aac_encoder_cb.aac_handle, &aac_info);
if (aac_error != AACENC_OK) {
LOG_ERROR(LOG_TAG,
"%s: Cannot retrieve the AAC encoder info: AAC error 0x%x",
__func__, aac_error);
return; // TODO: Return an error?
}
p_encoder_params->frame_length = aac_info.frameLength;
p_encoder_params->input_channels_n = aac_info.inputChannels;
p_encoder_params->max_encoded_buffer_bytes = aac_info.maxOutBufBytes;
LOG_DEBUG(LOG_TAG,
"%s: AAC frame_length = %u input_channels_n = %u "
"max_encoded_buffer_bytes = %d",
__func__, p_encoder_params->frame_length,
p_encoder_params->input_channels_n,
p_encoder_params->max_encoded_buffer_bytes);
}
void a2dp_aac_encoder_cleanup(void) {
if (a2dp_aac_encoder_cb.has_aac_handle)
aacEncClose(&a2dp_aac_encoder_cb.aac_handle);
memset(&a2dp_aac_encoder_cb, 0, sizeof(a2dp_aac_encoder_cb));
}
void a2dp_aac_feeding_reset(void) {
/* By default, just clear the entire state */
memset(&a2dp_aac_encoder_cb.aac_feeding_state, 0,
sizeof(a2dp_aac_encoder_cb.aac_feeding_state));
a2dp_aac_encoder_cb.aac_feeding_state.bytes_per_tick =
(a2dp_aac_encoder_cb.feeding_params.sample_rate *
a2dp_aac_encoder_cb.feeding_params.bits_per_sample / 8 *
a2dp_aac_encoder_cb.feeding_params.channel_count *
A2DP_AAC_ENCODER_INTERVAL_MS) /
1000;
LOG_DEBUG(LOG_TAG, "%s: PCM bytes per tick %u", __func__,
a2dp_aac_encoder_cb.aac_feeding_state.bytes_per_tick);
}
void a2dp_aac_feeding_flush(void) {
a2dp_aac_encoder_cb.aac_feeding_state.counter = 0;
}
period_ms_t a2dp_aac_get_encoder_interval_ms(void) {
return A2DP_AAC_ENCODER_INTERVAL_MS;
}
void a2dp_aac_send_frames(uint64_t timestamp_us) {
uint8_t nb_frame = 0;
uint8_t nb_iterations = 0;
a2dp_aac_get_num_frame_iteration(&nb_iterations, &nb_frame, timestamp_us);
LOG_VERBOSE(LOG_TAG, "%s: Sending %d frames per iteration, %d iterations",
__func__, nb_frame, nb_iterations);
if (nb_frame == 0) return;
for (uint8_t counter = 0; counter < nb_iterations; counter++) {
// Transcode frame and enqueue
a2dp_aac_encode_frames(nb_frame);
}
}
// Obtains the number of frames to send and number of iterations
// to be used. |num_of_iterations| and |num_of_frames| parameters
// are used as output param for returning the respective values.
static void a2dp_aac_get_num_frame_iteration(uint8_t* num_of_iterations,
uint8_t* num_of_frames,
uint64_t timestamp_us) {
uint32_t result = 0;
uint8_t nof = 0;
uint8_t noi = 1;
uint32_t pcm_bytes_per_frame =
a2dp_aac_encoder_cb.aac_encoder_params.frame_length *
a2dp_aac_encoder_cb.feeding_params.channel_count *
a2dp_aac_encoder_cb.feeding_params.bits_per_sample / 8;
LOG_VERBOSE(LOG_TAG, "%s: pcm_bytes_per_frame %u", __func__,
pcm_bytes_per_frame);
uint32_t us_this_tick = A2DP_AAC_ENCODER_INTERVAL_MS * 1000;
uint64_t now_us = timestamp_us;
if (a2dp_aac_encoder_cb.aac_feeding_state.last_frame_us != 0)
us_this_tick =
(now_us - a2dp_aac_encoder_cb.aac_feeding_state.last_frame_us);
a2dp_aac_encoder_cb.aac_feeding_state.last_frame_us = now_us;
a2dp_aac_encoder_cb.aac_feeding_state.counter +=
a2dp_aac_encoder_cb.aac_feeding_state.bytes_per_tick * us_this_tick /
(A2DP_AAC_ENCODER_INTERVAL_MS * 1000);
result = a2dp_aac_encoder_cb.aac_feeding_state.counter / pcm_bytes_per_frame;
a2dp_aac_encoder_cb.aac_feeding_state.counter -= result * pcm_bytes_per_frame;
nof = result;
LOG_VERBOSE(LOG_TAG, "%s: effective num of frames %u, iterations %u",
__func__, nof, noi);
*num_of_frames = nof;
*num_of_iterations = noi;
}
static void a2dp_aac_encode_frames(uint8_t nb_frame) {
tA2DP_AAC_ENCODER_PARAMS* p_encoder_params =
&a2dp_aac_encoder_cb.aac_encoder_params;
tA2DP_FEEDING_PARAMS* p_feeding_params = &a2dp_aac_encoder_cb.feeding_params;
uint8_t remain_nb_frame = nb_frame;
uint8_t read_buffer[BT_DEFAULT_BUFFER_SIZE];
int pcm_bytes_per_frame = p_encoder_params->frame_length *
p_feeding_params->channel_count *
p_feeding_params->bits_per_sample / 8;
CHECK(pcm_bytes_per_frame <= static_cast<int>(sizeof(read_buffer)));
// Setup the input buffer
AACENC_BufDesc in_buf_desc;
void* in_buf_vector[1] = {nullptr};
int in_buf_identifiers[1] = {IN_AUDIO_DATA};
int in_buf_sizes[1] = {pcm_bytes_per_frame};
int in_buf_element_sizes[1] = {p_feeding_params->bits_per_sample / 8};
in_buf_desc.numBufs = 1;
in_buf_desc.bufs = in_buf_vector;
in_buf_desc.bufferIdentifiers = in_buf_identifiers;
in_buf_desc.bufSizes = in_buf_sizes;
in_buf_desc.bufElSizes = in_buf_element_sizes;
// Setup the output buffer (partially)
AACENC_BufDesc out_buf_desc;
void* out_buf_vector[1] = {nullptr};
int out_buf_identifiers[1] = {OUT_BITSTREAM_DATA};
int out_buf_sizes[1] = {p_encoder_params->max_encoded_buffer_bytes};
// NOTE: out_buf_element_sizes below is probably unused by the encoder
int out_buf_element_sizes[1] = {p_feeding_params->bits_per_sample / 8};
out_buf_desc.numBufs = 1;
out_buf_desc.bufs = out_buf_vector;
out_buf_desc.bufferIdentifiers = out_buf_identifiers;
out_buf_desc.bufSizes = out_buf_sizes;
out_buf_desc.bufElSizes = out_buf_element_sizes;
CHECK(p_encoder_params->max_encoded_buffer_bytes <=
static_cast<int>(BT_DEFAULT_BUFFER_SIZE - sizeof(BT_HDR)));
AACENC_InArgs aac_in_args;
aac_in_args.numInSamples =
p_encoder_params->frame_length * p_feeding_params->channel_count;
aac_in_args.numAncBytes = 0;
AACENC_OutArgs aac_out_args = {
.numOutBytes = 0, .numInSamples = 0, .numAncBytes = 0};
uint32_t count;
int written = 0;
while (nb_frame) {
BT_HDR* p_buf = (BT_HDR*)osi_malloc(BT_DEFAULT_BUFFER_SIZE);
p_buf->offset = A2DP_AAC_OFFSET;
p_buf->len = 0;
p_buf->layer_specific = 0;
a2dp_aac_encoder_cb.stats.media_read_total_expected_packets++;
count = 0;
do {
//
// Read the PCM data and encode it
//
if (a2dp_aac_read_feeding(read_buffer)) {
uint8_t* packet = (uint8_t*)(p_buf + 1) + p_buf->offset + p_buf->len;
if (!a2dp_aac_encoder_cb.has_aac_handle) {
LOG_ERROR(LOG_TAG, "%s: invalid AAC handle", __func__);
a2dp_aac_encoder_cb.stats.media_read_total_dropped_packets++;
osi_free(p_buf);
return;
}
in_buf_vector[0] = read_buffer;
out_buf_vector[0] = packet + count;
AACENC_ERROR aac_error =
aacEncEncode(a2dp_aac_encoder_cb.aac_handle, &in_buf_desc,
&out_buf_desc, &aac_in_args, &aac_out_args);
if (aac_error != AACENC_OK) {
LOG_ERROR(LOG_TAG, "%s: AAC encoding error: 0x%x", __func__,
aac_error);
a2dp_aac_encoder_cb.stats.media_read_total_dropped_packets++;
osi_free(p_buf);
return;
}
written = aac_out_args.numOutBytes;
count += written;
p_buf->len += written;
nb_frame--;
p_buf->layer_specific++; // added a frame to the buffer
} else {
LOG_WARN(LOG_TAG, "%s: underflow %d", __func__, nb_frame);
a2dp_aac_encoder_cb.aac_feeding_state.counter +=
nb_frame * p_encoder_params->frame_length *
p_feeding_params->channel_count *
p_feeding_params->bits_per_sample / 8;
// no more pcm to read
nb_frame = 0;
}
} while ((written == 0) && nb_frame);
// NOTE: We don't check whether the packet will fit in the MTU,
// because AAC doesn't give us control over the encoded frame size.
// If the packet is larger than the MTU, it will be fragmented before
// transmission.
if (p_buf->len) {
/*
* Timestamp of the media packet header represent the TS of the
* first frame, i.e the timestamp before including this frame.
*/
*((uint32_t*)(p_buf + 1)) = a2dp_aac_encoder_cb.timestamp;
a2dp_aac_encoder_cb.timestamp +=
p_buf->layer_specific * p_encoder_params->frame_length;
uint8_t done_nb_frame = remain_nb_frame - nb_frame;
remain_nb_frame = nb_frame;
if (!a2dp_aac_encoder_cb.enqueue_callback(p_buf, done_nb_frame)) return;
} else {
a2dp_aac_encoder_cb.stats.media_read_total_dropped_packets++;
osi_free(p_buf);
}
}
}
static bool a2dp_aac_read_feeding(uint8_t* read_buffer) {
uint32_t read_size = a2dp_aac_encoder_cb.aac_encoder_params.frame_length *
a2dp_aac_encoder_cb.feeding_params.channel_count *
a2dp_aac_encoder_cb.feeding_params.bits_per_sample / 8;
a2dp_aac_encoder_cb.stats.media_read_total_expected_reads_count++;
a2dp_aac_encoder_cb.stats.media_read_total_expected_read_bytes += read_size;
/* Read Data from UIPC channel */
uint32_t nb_byte_read =
a2dp_aac_encoder_cb.read_callback(read_buffer, read_size);
a2dp_aac_encoder_cb.stats.media_read_total_actual_read_bytes += nb_byte_read;
if (nb_byte_read < read_size) {
if (nb_byte_read == 0) return false;
/* Fill the unfilled part of the read buffer with silence (0) */
memset(((uint8_t*)read_buffer) + nb_byte_read, 0, read_size - nb_byte_read);
nb_byte_read = read_size;
}
a2dp_aac_encoder_cb.stats.media_read_total_actual_reads_count++;
return true;
}
period_ms_t A2dpCodecConfigAac::encoderIntervalMs() const {
return a2dp_aac_get_encoder_interval_ms();
}
void A2dpCodecConfigAac::debug_codec_dump(int fd) {
a2dp_aac_encoder_stats_t* stats = &a2dp_aac_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);
}