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Commit 2acd1fc0 authored by Cheney Ni's avatar Cheney Ni Committed by Automerger Merge Worker
Browse files

A2DP: Use codec_specific_1 to report AAC bitrate mode to upper layer am: f34ea79c 

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/bt/+/11746684

Change-Id: Ie370beaf8f14156bd422d21536e182c5ecd0ab63
parents f2618ff5 f34ea79c

system/stack/a2dp/a2dp_aac.cc

+57 −7
Original line number Diff line number Diff line
@@ -1069,6 +1069,14 @@ bool A2dpCodecConfigAacBase::setCodecConfig(const uint8_t* p_peer_codec_info, 
  result_config_cie.variableBitRateSupport =

      p_a2dp_aac_caps->variableBitRateSupport &

      peer_info_cie.variableBitRateSupport;

  if (result_config_cie.variableBitRateSupport !=

      A2DP_AAC_VARIABLE_BIT_RATE_DISABLED) {

    codec_config_.codec_specific_1 =

        static_cast<int64_t>(AacEncoderBitrateMode::AACENC_BR_MODE_VBR_5);

  } else {

    codec_config_.codec_specific_1 =

        static_cast<int64_t>(AacEncoderBitrateMode::AACENC_BR_MODE_CBR);

  }



  // Set the bit rate as follows:

  // 1. If the remote device reports a bogus bit rate
@@ -1341,16 +1349,41 @@ bool A2dpCodecConfigAacBase::setCodecConfig(const uint8_t* p_peer_codec_info, 
    goto fail;

  }



  if (A2DP_BuildInfoAac(AVDT_MEDIA_TYPE_AUDIO, &result_config_cie,

                        p_result_codec_config) != A2DP_SUCCESS) {

    goto fail;

  }



  //

  // Copy the codec-specific fields if they are not zero

  //

  if (codec_user_config_.codec_specific_1 != 0)

  if (codec_user_config_.codec_specific_1 != 0) {

    if (result_config_cie.variableBitRateSupport !=

        A2DP_AAC_VARIABLE_BIT_RATE_DISABLED) {

      auto user_bitrate_mode = codec_user_config_.codec_specific_1;

      switch (static_cast<AacEncoderBitrateMode>(user_bitrate_mode)) {

        case AacEncoderBitrateMode::AACENC_BR_MODE_VBR_C:

          // VBR is supported, and is disabled by the user preference

          result_config_cie.variableBitRateSupport =

              A2DP_AAC_VARIABLE_BIT_RATE_DISABLED;

          [[fallthrough]];

        case AacEncoderBitrateMode::AACENC_BR_MODE_VBR_1:

          [[fallthrough]];

        case AacEncoderBitrateMode::AACENC_BR_MODE_VBR_2:

          [[fallthrough]];

        case AacEncoderBitrateMode::AACENC_BR_MODE_VBR_3:

          [[fallthrough]];

        case AacEncoderBitrateMode::AACENC_BR_MODE_VBR_4:

          [[fallthrough]];

        case AacEncoderBitrateMode::AACENC_BR_MODE_VBR_5:

          codec_config_.codec_specific_1 = codec_user_config_.codec_specific_1;

          break;

        default:

          codec_config_.codec_specific_1 =

              static_cast<int64_t>(AacEncoderBitrateMode::AACENC_BR_MODE_VBR_5);

      }

    } else {

      // It is no needed to check the user preference when Variable Bitrate

      // unsupported by one of source or sink

      codec_config_.codec_specific_1 =

          static_cast<int64_t>(AacEncoderBitrateMode::AACENC_BR_MODE_CBR);

    }

  }

  if (codec_user_config_.codec_specific_2 != 0)

    codec_config_.codec_specific_2 = codec_user_config_.codec_specific_2;

  if (codec_user_config_.codec_specific_3 != 0)
@@ -1358,6 +1391,11 @@ bool A2dpCodecConfigAacBase::setCodecConfig(const uint8_t* p_peer_codec_info, 
  if (codec_user_config_.codec_specific_4 != 0)

    codec_config_.codec_specific_4 = codec_user_config_.codec_specific_4;



  if (A2DP_BuildInfoAac(AVDT_MEDIA_TYPE_AUDIO, &result_config_cie,

                        p_result_codec_config) != A2DP_SUCCESS) {

    goto fail;

  }



  // Create a local copy of the peer codec capability/config, and the

  // result codec config.

  if (is_capability) {
@@ -1394,6 +1432,7 @@ bool A2dpCodecConfigAacBase::setPeerCodecCapabilities( 
  tA2DP_AAC_CIE peer_info_cie;

  uint8_t channelMode;

  uint16_t sampleRate;

  uint8_t variableBitRateSupport;

  const tA2DP_AAC_CIE* p_a2dp_aac_caps =

      (is_source_) ? &a2dp_aac_source_caps : &a2dp_aac_sink_caps;
@@ -1446,6 +1485,17 @@ bool A2dpCodecConfigAacBase::setPeerCodecCapabilities( 
        BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO;

  }



  // Compute the selectable capability - variable bitrate mode

  variableBitRateSupport = p_a2dp_aac_caps->variableBitRateSupport &

                           peer_info_cie.variableBitRateSupport;

  if (variableBitRateSupport != A2DP_AAC_VARIABLE_BIT_RATE_DISABLED) {

    codec_selectable_capability_.codec_specific_1 =

        static_cast<int64_t>(AacEncoderBitrateMode::AACENC_BR_MODE_VBR_5);

  } else {

    codec_selectable_capability_.codec_specific_1 =

        static_cast<int64_t>(AacEncoderBitrateMode::AACENC_BR_MODE_CBR);

  }



  status = A2DP_BuildInfoAac(AVDT_MEDIA_TYPE_AUDIO, &peer_info_cie,

                             ota_codec_peer_capability_);

  CHECK(status == A2DP_SUCCESS);

system/stack/a2dp/a2dp_aac_encoder.cc

+30 −0
Original line number Diff line number Diff line
@@ -414,7 +414,29 @@ static void a2dp_aac_encoder_update(uint16_t peer_mtu, 
              "invalid codec bit rate mode",

              __func__);

    return;  // TODO: Return an error?

  } else if (aac_param_value == A2DP_AAC_VARIABLE_BIT_RATE_ENABLED) {

    // VBR has 5 modes defined in external/aac/libAACenc/src/aacenc.h

    // A2DP_AAC_VARIABLE_BIT_RATE_DISABLED is equal to AACENC_BR_MODE_CBR

    auto bitrate_mode = a2dp_codec_config->getCodecConfig().codec_specific_1;

    switch (static_cast<AacEncoderBitrateMode>(bitrate_mode)) {

      case AacEncoderBitrateMode::AACENC_BR_MODE_VBR_1:

        [[fallthrough]];

      case AacEncoderBitrateMode::AACENC_BR_MODE_VBR_2:

        [[fallthrough]];

      case AacEncoderBitrateMode::AACENC_BR_MODE_VBR_3:

        [[fallthrough]];

      case AacEncoderBitrateMode::AACENC_BR_MODE_VBR_4:

        [[fallthrough]];

      case AacEncoderBitrateMode::AACENC_BR_MODE_VBR_5:

        break;

      default:

        bitrate_mode =

            static_cast<int64_t>(AacEncoderBitrateMode::AACENC_BR_MODE_VBR_5);

    }

    aac_param_value =

        static_cast<uint8_t>(bitrate_mode) & ~A2DP_AAC_VARIABLE_BIT_RATE_MASK;

  }

  LOG_INFO(LOG_TAG, "%s: AACENC_BITRATEMODE: %d", __func__, aac_param_value);

  aac_error = aacEncoder_SetParam(a2dp_aac_encoder_cb.aac_handle,

                                  AACENC_BITRATEMODE, aac_param_value);

  if (aac_error != AACENC_OK) {
@@ -740,6 +762,14 @@ void A2dpCodecConfigAacSource::debug_codec_dump(int fd) { 


  A2dpCodecConfig::debug_codec_dump(fd);



  auto codec_specific_1 = getCodecConfig().codec_specific_1;

  dprintf(

      fd,

      "  AAC bitrate mode                                        : %s "

      "(0x%" PRIx64 ")\n",

      ((codec_specific_1 & ~A2DP_AAC_VARIABLE_BIT_RATE_MASK) == 0 ? "Constant"

                                                                  : "Variable"),

      codec_specific_1);

  dprintf(fd,

          "  Packet counts (expected/dropped)                        : %zu / "

          "%zu\n",

system/stack/include/a2dp_aac_encoder.h

+21 −0
Original line number Diff line number Diff line
@@ -21,8 +21,29 @@ 
#ifndef A2DP_AAC_ENCODER_H

#define A2DP_AAC_ENCODER_H



#include "a2dp_aac_constants.h"

#include "a2dp_codec_api.h"



// Is used in btav_a2dp_codec_config_t.codec_specific_1 when codec is AAC

enum class AacEncoderBitrateMode : int64_t {

  // Variable bitrate mode unsupported when used in a codec report, and upper

  // layer can use this value as system default (keep current settings)

  AACENC_BR_MODE_CBR = A2DP_AAC_VARIABLE_BIT_RATE_DISABLED,

  // Constant bitrate mode when Variable bitrate mode is supported. This can

  // also be used to disable Variable bitrate mode by upper layer

  AACENC_BR_MODE_VBR_C = (A2DP_AAC_VARIABLE_BIT_RATE_ENABLED | 0x00),

  // Variable bitrate mode (very low bitrate for software encoding).

  AACENC_BR_MODE_VBR_1 = (A2DP_AAC_VARIABLE_BIT_RATE_ENABLED | 0x01),

  // Variable bitrate mode (low bitrate for software encoding).

  AACENC_BR_MODE_VBR_2 = (A2DP_AAC_VARIABLE_BIT_RATE_ENABLED | 0x02),

  // Variable bitrate mode (medium bitrate for software encoding).

  AACENC_BR_MODE_VBR_3 = (A2DP_AAC_VARIABLE_BIT_RATE_ENABLED | 0x03),

  // Variable bitrate mode (high bitrate for software encoding).

  AACENC_BR_MODE_VBR_4 = (A2DP_AAC_VARIABLE_BIT_RATE_ENABLED | 0x04),

  // Variable bitrate mode (very high bitrate for software encoding).

  AACENC_BR_MODE_VBR_5 = (A2DP_AAC_VARIABLE_BIT_RATE_ENABLED | 0x05),

};



// Loads the A2DP AAC encoder.

// Return true on success, otherwise false.

bool A2DP_LoadEncoderAac(void);