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- /*
- misc_wav.c
- Copyright (c) 2004 NoisyB
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with this library; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <math.h>
- #include "misc.h"
- #include "misc_wav.h"
- #ifndef M_PI
- #define M_PI 3.1415926535
- #endif
- // TODO: replace ceil(), floor() and sin()
- #if 0
- unsigned char wav_header[3][80] = {
- {
- 'R', 'I', 'F', 'F', 0x80, 0x80, 0x80, 0x80, // RIFF TAG
- 'W', 'A', 'V', 'E', // WAV TAG
- 'f', 'm', 't', ' ', 0x10, 0, 0, 0, // FMT TAG
- 1, 0, // format (WAVE_FORMAT_PCM)
- 1, 0, // CHANNELS
- 0x22, 0x56, 0, 0, // SamplesPerSec
- 0x22, 0x56, 0, 0, // BytesPerSec
- 1, 0, // Block align
- 8, 0, // Bits per sample
- 'd', 'a', 't', 'a', 0, 0, 0, 0, '\0' // DATA TAG
- },
- {
- 'R', 'I', 'F', 'F', 0x80, 0x80, 0x80, 0x80, // RIFF TAG
- 'W', 'A', 'V', 'E', // WAV TAG
- 'f', 'm', 't', ' ', 0x10, 0, 0, 0, // FMT TAG
- 1, 0, // format (WAVE_FORMAT_PCM)
- 1, 0, // CHANNELS
- 0x44, 0xac, 0, 0, // SamplesPerSec
- 0x44, 0xac, 0, 0, // BytesPerSec
- 1, 0, // Block align
- 8, 0, // Bits per sample
- 'd', 'a', 't', 'a', 0, 0, 0, 0, '\0' // DATA TAG
- },
- {
- 'R', 'I', 'F', 'F', 0x80, 0x80, 0x80, 0x80, // RIFF TAG
- 'W', 'A', 'V', 'E', // WAV TAG
- 'f', 'm', 't', ' ', 0x10, 0, 0, 0, // FMT TAG
- 1, 0, // format (WAVE_FORMAT_PCM)
- 2, 0, // CHANNELS
- 0x44, 0xac, 0, 0, // SamplesPerSec
- 0x10, 0xb1, 2, 0, // BytesPerSec
- 4, 0, // Block align
- 0x10, 0, // Bits per sample
- 'd', 'a', 't', 'a', 0, 0, 0, 0, '\0' // DATA TAG
- }
- };
- #endif
- typedef struct
- {
- uint8_t magic[4]; // 'RIFF'
- uint32_t total_length; // length of file minus the 8 byte riff header
- uint8_t type[4]; // 'WAVE'
- uint8_t fmt[4]; // 'fmt '
- uint32_t header_length; // length of format chunk minus 8 byte header
- uint16_t format; // identifies WAVE_FORMAT_PCM
- uint16_t channels;
- uint32_t freq; // samples per second per channel
- uint32_t bytespersecond;
- uint16_t blockalign; // basic block size
- uint16_t bitspersample;
- // PCM formats then go straight to the data chunk
- uint8_t data[4]; // 'data'
- uint32_t data_length; // length of data chunk minus 8 byte header
- } st_wav_header_t;
- int
- misc_wav_write_header (FILE *fh, int channels, int freq,
- int bytespersecond, int blockalign,
- int bitspersample, int data_length)
- {
- st_wav_header_t wav_header;
- memset (&wav_header, 0, sizeof (st_wav_header_t));
- strncpy ((char *) wav_header.magic, "RIFF", 4);
- wav_header.total_length = me2le_32 (data_length + sizeof (st_wav_header_t) - 8);
- strncpy ((char *) wav_header.type, "WAVE", 4);
- strncpy ((char *) wav_header.fmt, "fmt ", 4);
- wav_header.header_length = me2le_32 (16); // always 16
- wav_header.format = me2le_16 (1); // WAVE_FORMAT_PCM == default
- wav_header.channels = (uint16_t) me2le_16 (channels);
- wav_header.freq = me2le_32 (freq);
- wav_header.bytespersecond = me2le_32 (bytespersecond);
- wav_header.blockalign = (uint16_t) me2le_16 (blockalign);
- wav_header.bitspersample = (uint16_t) me2le_16 (bitspersample);
- strncpy ((char *) wav_header.data, "data", 4);
- wav_header.data_length = me2le_32 (data_length);
- return fwrite (&wav_header, 1, sizeof (st_wav_header_t), fh);
- }
- void
- misc_wav_generator (unsigned char *bit, int bitLength, float volume, int wavType)
- {
- int i;
- #ifndef USE_LIBMATH
- (void) wavType;
- #else
- if (wavType == SQUARE_WAVE)
- #endif // USE_LIBMATH
- {
- int halfBitLength = (int) (floor ((float) bitLength) / 2.0);
- int isOdd = (int) (ceil ((float) bitLength / 2.0) - halfBitLength);
- for (i = 0; i < halfBitLength; i++)
- bit[i] = (unsigned char) floor (0xfc * volume);
- if (isOdd)
- bit[i++] = 0x80;
- for (; i < bitLength; i++)
- bit[i] = (unsigned char) floor (0x06 * volume);
- }
- #ifdef USE_LIBMATH
- else // SINE_WAV
- for (i = 0; i < bitLength; i++)
- bit[i] = (unsigned char) floor
- (((sin ((((double) 2 * (double) M_PI) / (double) bitLength) * (double) i) * volume + 1) * 128));
- #endif // USE_LIBMATH
- }
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