1/* 2 * Copyright (C) 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#define LOG_TAG "a2dp_sbc_decoder" 18 19#include "a2dp_sbc_decoder.h" 20 21#include <base/logging.h> 22 23#include "embdrv/sbc/decoder/include/oi_codec_sbc.h" 24#include "embdrv/sbc/decoder/include/oi_status.h" 25#include "osi/include/log.h" 26 27typedef struct { 28 OI_CODEC_SBC_DECODER_CONTEXT decoder_context; 29 uint32_t context_data[CODEC_DATA_WORDS(2, SBC_CODEC_FAST_FILTER_BUFFERS)]; 30 int16_t decode_buf[15 * SBC_MAX_SAMPLES_PER_FRAME * SBC_MAX_CHANNELS]; 31 decoded_data_callback_t decode_callback; 32} tA2DP_SBC_DECODER_CB; 33 34static tA2DP_SBC_DECODER_CB a2dp_sbc_decoder_cb; 35 36bool A2DP_LoadDecoderSbc(void) { 37 // Nothing to do - the library is statically linked 38 return true; 39} 40 41void A2DP_UnloadDecoderSbc(void) { a2dp_sbc_decoder_cleanup(); } 42 43bool a2dp_sbc_decoder_init(decoded_data_callback_t decode_callback) { 44 OI_STATUS status = OI_CODEC_SBC_DecoderReset( 45 &a2dp_sbc_decoder_cb.decoder_context, a2dp_sbc_decoder_cb.context_data, 46 sizeof(a2dp_sbc_decoder_cb.context_data), 2, 2, false); 47 if (!OI_SUCCESS(status)) { 48 LOG_ERROR(LOG_TAG, 49 "%s: OI_CODEC_SBC_DecoderReset failed with error code %d", 50 __func__, status); 51 return false; 52 } 53 54 a2dp_sbc_decoder_cb.decode_callback = decode_callback; 55 return true; 56} 57 58void a2dp_sbc_decoder_cleanup(void) { 59 // Do nothing. 60} 61 62bool a2dp_sbc_decoder_decode_packet(BT_HDR* p_buf) { 63 uint8_t* data = p_buf->data + p_buf->offset; 64 size_t data_size = p_buf->len; 65 66 if (data_size == 0) { 67 LOG_ERROR(LOG_TAG, "%s: Empty packet", __func__); 68 return false; 69 } 70 size_t num_frames = data[0] & 0xf; 71 data += 1; 72 data_size -= 1; 73 74 const OI_BYTE* oi_data = data; 75 uint32_t oi_size = data_size; 76 size_t out_avail = sizeof(a2dp_sbc_decoder_cb.decode_buf); 77 int16_t* out_ptr = a2dp_sbc_decoder_cb.decode_buf; 78 79 for (size_t i = 0; i < num_frames; ++i) { 80 uint32_t out_size = out_avail; 81 OI_STATUS status = 82 OI_CODEC_SBC_DecodeFrame(&a2dp_sbc_decoder_cb.decoder_context, &oi_data, 83 &oi_size, out_ptr, &out_size); 84 if (!OI_SUCCESS(status)) { 85 LOG_ERROR(LOG_TAG, "%s: Decoding failure: %d", __func__, status); 86 return false; 87 } 88 out_avail -= out_size; 89 out_ptr += out_size / sizeof(*out_ptr); 90 } 91 92 size_t out_used = 93 (out_ptr - a2dp_sbc_decoder_cb.decode_buf) * sizeof(*out_ptr); 94 a2dp_sbc_decoder_cb.decode_callback( 95 reinterpret_cast<uint8_t*>(a2dp_sbc_decoder_cb.decode_buf), out_used); 96 return true; 97} 98