1 /* 2 * Copyright 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 // 18 // Interface to the A2DP AAC Encoder 19 // 20 21 #ifndef A2DP_AAC_ENCODER_H 22 #define A2DP_AAC_ENCODER_H 23 24 #include "a2dp_aac_constants.h" 25 #include "a2dp_codec_api.h" 26 27 // Is used in btav_a2dp_codec_config_t.codec_specific_1 when codec is AAC 28 enum class AacEncoderBitrateMode : int64_t { 29 // Variable bitrate mode unsupported when used in a codec report, and upper 30 // layer can use this value as system default (keep current settings) 31 AACENC_BR_MODE_CBR = A2DP_AAC_VARIABLE_BIT_RATE_DISABLED, 32 // Constant bitrate mode when Variable bitrate mode is supported. This can 33 // also be used to disable Variable bitrate mode by upper layer 34 AACENC_BR_MODE_VBR_C = (A2DP_AAC_VARIABLE_BIT_RATE_ENABLED | 0x00), 35 // Variable bitrate mode (very low bitrate for software encoding). 36 AACENC_BR_MODE_VBR_1 = (A2DP_AAC_VARIABLE_BIT_RATE_ENABLED | 0x01), 37 // Variable bitrate mode (low bitrate for software encoding). 38 AACENC_BR_MODE_VBR_2 = (A2DP_AAC_VARIABLE_BIT_RATE_ENABLED | 0x02), 39 // Variable bitrate mode (medium bitrate for software encoding). 40 AACENC_BR_MODE_VBR_3 = (A2DP_AAC_VARIABLE_BIT_RATE_ENABLED | 0x03), 41 // Variable bitrate mode (high bitrate for software encoding). 42 AACENC_BR_MODE_VBR_4 = (A2DP_AAC_VARIABLE_BIT_RATE_ENABLED | 0x04), 43 // Variable bitrate mode (very high bitrate for software encoding). 44 AACENC_BR_MODE_VBR_5 = (A2DP_AAC_VARIABLE_BIT_RATE_ENABLED | 0x05), 45 }; 46 47 // Loads the A2DP AAC encoder. 48 // Return true on success, otherwise false. 49 bool A2DP_LoadEncoderAac(void); 50 51 // Unloads the A2DP AAC encoder. 52 void A2DP_UnloadEncoderAac(void); 53 54 // Initialize the A2DP AAC encoder. 55 // |p_peer_params| contains the A2DP peer information 56 // The current A2DP codec config is in |a2dp_codec_config|. 57 // |read_callback| is the callback for reading the input audio data. 58 // |enqueue_callback| is the callback for enqueueing the encoded audio data. 59 void a2dp_aac_encoder_init(const tA2DP_ENCODER_INIT_PEER_PARAMS* p_peer_params, 60 A2dpCodecConfig* a2dp_codec_config, 61 a2dp_source_read_callback_t read_callback, 62 a2dp_source_enqueue_callback_t enqueue_callback); 63 64 // Cleanup the A2DP AAC encoder. 65 void a2dp_aac_encoder_cleanup(void); 66 67 // Reset the feeding for the A2DP AAC encoder. 68 void a2dp_aac_feeding_reset(void); 69 70 // Flush the feeding for the A2DP AAC encoder. 71 void a2dp_aac_feeding_flush(void); 72 73 // Get the A2DP AAC encoder interval (in milliseconds). 74 uint64_t a2dp_aac_get_encoder_interval_ms(void); 75 76 // Prepare and send A2DP AAC encoded frames. 77 // |timestamp_us| is the current timestamp (in microseconds). 78 void a2dp_aac_send_frames(uint64_t timestamp_us); 79 80 #endif // A2DP_AAC_ENCODER_H 81