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Commit f2618ff5 authored by Cheney Ni's avatar Cheney Ni Committed by Automerger Merge Worker
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A2DP: Enable AAC VBR for A2DP source feature am: 2c5ae4fb 

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/bt/+/11929819

Change-Id: Ie88a10b9a8778af5488d81bb85c9c6b19f54021a
parents b10393fb 2c5ae4fb

system/stack/a2dp/a2dp_aac.cc

+34 −1
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ 
#include "bt_utils.h"

#include "osi/include/log.h"

#include "osi/include/osi.h"

#include "osi/include/properties.h"



#define A2DP_AAC_DEFAULT_BITRATE 320000  // 320 kbps

#define A2DP_AAC_MIN_BITRATE 64000       // 64 kbps
@@ -50,8 +51,11 @@ typedef struct { 
  btav_a2dp_codec_bits_per_sample_t bits_per_sample;

} tA2DP_AAC_CIE;



static bool aac_source_caps_configured = false;

static tA2DP_AAC_CIE a2dp_aac_source_caps = {};



/* AAC Source codec capabilities */

static const tA2DP_AAC_CIE a2dp_aac_source_caps = {

static const tA2DP_AAC_CIE a2dp_aac_cbr_source_caps = {

    // objectType

    A2DP_AAC_OBJECT_TYPE_MPEG2_LC,

    // sampleRate
@@ -66,6 +70,22 @@ static const tA2DP_AAC_CIE a2dp_aac_source_caps = { 
    // bits_per_sample

    BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16};



/* AAC Source codec capabilities */

static const tA2DP_AAC_CIE a2dp_aac_vbr_source_caps = {

    // objectType

    A2DP_AAC_OBJECT_TYPE_MPEG2_LC,

    // sampleRate

    // TODO: AAC 48.0kHz sampling rate should be added back - see b/62301376

    A2DP_AAC_SAMPLING_FREQ_44100,

    // channelMode

    A2DP_AAC_CHANNEL_MODE_STEREO,

    // variableBitRateSupport

    A2DP_AAC_VARIABLE_BIT_RATE_ENABLED,

    // bitRate

    A2DP_AAC_DEFAULT_BITRATE,

    // bits_per_sample

    BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16};



/* AAC Sink codec capabilities */

static const tA2DP_AAC_CIE a2dp_aac_sink_caps = {

    // objectType
@@ -708,7 +728,19 @@ const char* A2DP_CodecIndexStrAac(void) { return "AAC"; } 


const char* A2DP_CodecIndexStrAacSink(void) { return "AAC SINK"; }



void aac_source_caps_initialize() {

  if (aac_source_caps_configured) {

    return;

  }

  a2dp_aac_source_caps =

      osi_property_get_bool("persist.bluetooth.a2dp_aac.vbr_supported", false)

          ? a2dp_aac_vbr_source_caps

          : a2dp_aac_cbr_source_caps;

  aac_source_caps_configured = true;

}



bool A2DP_InitCodecConfigAac(AvdtpSepConfig* p_cfg) {

  aac_source_caps_initialize();

  if (A2DP_BuildInfoAac(AVDT_MEDIA_TYPE_AUDIO, &a2dp_aac_source_caps,

                        p_cfg->codec_info) != A2DP_SUCCESS) {

    return false;
@@ -754,6 +786,7 @@ A2dpCodecConfigAacSource::A2dpCodecConfigAacSource( 
    btav_a2dp_codec_priority_t codec_priority)

    : A2dpCodecConfigAacBase(BTAV_A2DP_CODEC_INDEX_SOURCE_AAC,

                             A2DP_CodecIndexStrAac(), codec_priority, true) {

  aac_source_caps_initialize();

  // Compute the local capability

  if (a2dp_aac_source_caps.sampleRate & A2DP_AAC_SAMPLING_FREQ_44100) {

    codec_local_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_44100;