52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
#include "riff-acm.h"
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int wave_format_load(const uint8_t* data, int bytes, struct wave_format_t* wav)
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{
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if (bytes < 18)
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return -1;
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// little endian
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wav->wFormatTag = data[0] | ((uint16_t)data[1] << 8);
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wav->nChannels = data[2] | ((uint16_t)data[3] << 8);
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wav->nSamplesPerSec = ((uint32_t)data[4] << 0) | ((uint32_t)data[5] << 8) | ((uint32_t)data[6] << 16) | ((uint32_t)data[7] << 24);
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wav->nAvgBytesPerSec = ((uint32_t)data[8] << 0) | ((uint32_t)data[9] << 8) | ((uint32_t)data[10] << 16) | ((uint32_t)data[11] << 24);
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wav->nBlockAlign = data[12] | ((uint16_t)data[13] << 8);
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wav->wBitsPerSample = data[14] | ((uint16_t)data[15] << 8);
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wav->cbSize = data[16] | ((uint16_t)data[17] << 8);
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if (18 + wav->cbSize > bytes)
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return -1;
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return 18 + wav->cbSize;
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}
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int wave_format_save(const struct wave_format_t* wav, uint8_t* data, int bytes)
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{
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if (bytes < wav->cbSize)
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return -1;
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// little endian
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data[0] = (uint8_t)wav->wFormatTag;
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data[1] = (uint8_t)(wav->wFormatTag >> 8);
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data[2] = (uint8_t)wav->nChannels;
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data[3] = (uint8_t)(wav->nChannels >> 8);
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data[4] = (uint8_t)wav->nSamplesPerSec;
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data[5] = (uint8_t)(wav->nSamplesPerSec >> 8);
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data[6] = (uint8_t)(wav->nSamplesPerSec >> 16);
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data[7] = (uint8_t)(wav->nSamplesPerSec >> 24);
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data[8] = (uint8_t)wav->nAvgBytesPerSec;
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data[9] = (uint8_t)(wav->nAvgBytesPerSec >> 8);
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data[10] = (uint8_t)(wav->nAvgBytesPerSec >> 16);
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data[11] = (uint8_t)(wav->nAvgBytesPerSec >> 24);
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data[12] = (uint8_t)wav->nBlockAlign;
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data[13] = (uint8_t)(wav->nBlockAlign >> 8);
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data[14] = (uint8_t)wav->wBitsPerSample;
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data[15] = (uint8_t)(wav->wBitsPerSample >> 8);
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data[16] = (uint8_t)wav->cbSize;
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data[17] = (uint8_t)(wav->cbSize >> 8);
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//if(wav->cbSize > 0)
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// memcpy(data + 18, wav->extra, wav->cbSize);
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return wav->cbSize + 18;
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}
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