kopia lustrzana https://github.com/ogre/habdec
100 wiersze
3.3 KiB
JavaScript
100 wiersze
3.3 KiB
JavaScript
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function DecodeSpectrum(i_buffer, i_offset)
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{
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var header =
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{
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header_size_ : 0, // int32_t
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noise_floor_ : 0, // float
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noise_variance_ : 0, // float
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sampling_rate_: 0, // float
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shift_ : 0, // float
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peak_left_ : 0, // int32_t
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peak_right_ : 0, // int32_t
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peak_left_valid_ : 0, // int32_t
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peak_right_valid_ : 0, // int32_t
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min_ : 0, // float
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max_ : 0, // float
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type_size_ : 0, // int32_t. value:s 1/2/4 for uint8 uint16 float32
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size_ : 0 // int32_t
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};
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var dv = new DataView(i_buffer, i_offset);
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var offset = 0;
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header.header_size_ = dv.getInt32 (offset, true); offset += 4;
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header.noise_floor_ = dv.getFloat32 (offset, true); offset += 4;
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header.noise_variance_ = dv.getFloat32 (offset, true); offset += 4;
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header.sampling_rate_= dv.getFloat32 (offset, true); offset += 4;
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header.shift_ = dv.getFloat32 (offset, true); offset += 4;
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header.peak_left_ = dv.getInt32 (offset, true); offset += 4;
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header.peak_right_ = dv.getInt32 (offset, true); offset += 4;
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header.peak_left_valid_= dv.getInt32 (offset, true); offset += 4;
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header.peak_right_valid_= dv.getInt32 (offset, true); offset += 4;
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header.min_ = dv.getFloat32 (offset, true); offset += 4;
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header.max_ = dv.getFloat32 (offset, true); offset += 4;
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header.type_size_ = dv.getInt32 (offset, true); offset += 4;
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header.size_ = dv.getInt32 (offset, true); offset += 4;
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// add data
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if(header.type_size_ == 1) // 8 bit char
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header.values_ = new Uint8Array( i_buffer, offset, header.size_);
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else if(header.type_size_ == 2) // uint16_t
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header.values_ = new Uint16Array( i_buffer, offset, header.size_);
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else if(header.type_size_ == 4) // 32float
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header.values_ = new Float32Array( i_buffer, offset, header.size_);
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return header;
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}
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function DecodeDemod(i_buffer, i_offset)
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{
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var header =
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{
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header_size_ : 0, // int32_t
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min_ : 0, // float
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max_ : 0, // float
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type_size_ : 0, // int32_t. value:s 1/2/4 for uint8 uint16 float32
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size_ : 0 // int32_t
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};
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var dv = new DataView(i_buffer, i_offset);
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var offset = 0;
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header.header_size_ = dv.getInt32 (offset, true); offset += 4;
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header.min_ = dv.getFloat32 (offset, true); offset += 4;
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header.max_ = dv.getFloat32 (offset, true); offset += 4;
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header.type_size_ = dv.getInt32 (offset, true); offset += 4;
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header.size_ = dv.getInt32 (offset, true); offset += 4;
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// add data
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if(header.type_size_ == 1) // 8 bit char
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header.values_ = new Uint8Array( i_buffer, offset, header.size_);
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else if(header.type_size_ == 2) // uint16_t
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header.values_ = new Uint16Array( i_buffer, offset, header.size_);
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else if(header.type_size_ == 4) // 32float
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header.values_ = new Float32Array( i_buffer, offset, header.size_);
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return header;
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}
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function DecodeJpegBase64(i_buffer, i_offset)
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{
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var dv = new DataView(i_buffer, i_offset);
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var offset = 0;
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var callsign_size = dv.getInt32(offset, true); offset += 4;
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var image_id = dv.getInt32(offset, true); offset += 4;
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offset += 4; // why ?
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var callsing_data = new Uint8Array( i_buffer, offset, callsign_size); offset += callsign_size;
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var callsing_str = new TextDecoder("utf-8").decode(callsing_data);
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// rest is JPEG data
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var jpeg_data = new Uint8Array( i_buffer, offset );
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var jpeg_str = new TextDecoder("utf-8").decode(jpeg_data);
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return [callsing_str, image_id, jpeg_str];
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}
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