62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
// Copyright 2019 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <array>
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#include "adts.h"
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constexpr std::array<u32, 16> freq_table = {96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050,
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16000, 12000, 11025, 8000, 7350, 0, 0, 0};
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constexpr std::array<u8, 8> channel_table = {0, 1, 2, 3, 4, 5, 6, 8};
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ADTSData ParseADTS(const char* buffer) {
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u32 tmp = 0;
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ADTSData out;
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// sync word 0xfff
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tmp = (buffer[0] << 8) | (buffer[1] & 0xf0);
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if ((tmp & 0xffff) != 0xfff0) {
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out.length = 0;
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return out;
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}
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out.MPEG2 = (buffer[1] >> 3) & 0x1;
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// bit 17 to 18
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out.profile = (buffer[2] >> 6) + 1;
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// bit 19 to 22
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tmp = (buffer[2] >> 2) & 0xf;
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out.samplerate_idx = tmp;
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out.samplerate = (tmp > 15) ? 0 : freq_table[tmp];
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// bit 24 to 26
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tmp = ((buffer[2] & 0x1) << 2) | ((buffer[3] >> 6) & 0x3);
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out.channel_idx = tmp;
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out.channels = (tmp > 7) ? 0 : channel_table[tmp];
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// bit 55 to 56
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out.framecount = (buffer[6] & 0x3) + 1;
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// bit 31 to 43
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tmp = (buffer[3] & 0x3) << 11;
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tmp |= (buffer[4] << 3) & 0x7f8;
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tmp |= (buffer[5] >> 5) & 0x7;
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out.length = tmp;
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return out;
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}
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// last two bytes of MF AAC decoder user data
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// Audio object type (5 bits)
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// Sample rate profile (4 bits)
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// Channel configuration profile (4 bits)
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// Frame length flag (1 bit)
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// Depends on core coder (1 bit)
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// Extension flag (1 bit)
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u16 MFGetAACTag(const ADTSData& input) {
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u16 tag = 0;
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tag |= input.profile << 11;
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tag |= input.samplerate_idx << 7;
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tag |= input.channel_idx << 3;
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return tag;
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}
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