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/* snes_spc 0.9.0. http://www.slack.net/~ant/ */
#include "wave_writer.h"
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#ifdef _WIN32
#include <windows.h>
#endif
/* Copyright (C) 2003-2007 Shay Green. This module 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
module 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 module; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
enum { buf_size = 32768 * 2 };
enum { header_size = 0x2C };
typedef short sample_t;
struct Context
{
unsigned char *m_buf;
FILE *m_file;
long m_sample_count;
long m_sample_rate;
long m_buf_pos;
int m_chan_count;
};
static struct Context *g_wwContext = NULL;
static void exit_with_error(const char *str)
{
fprintf(stderr, "WAVE Writer Error: %s\n", str);
fflush(stderr);
}
int wave_open(long sample_rate, const char *filename)
{
g_wwContext = ctx_wave_open(sample_rate, filename);
return g_wwContext ? 0 : -1;
}
void wave_enable_stereo(void)
{
ctx_wave_enable_stereo(g_wwContext);
}
void wave_write(short const *in, long remain)
{
ctx_wave_write(g_wwContext, in, remain);
}
long wave_sample_count(void)
{
return ctx_wave_sample_count(g_wwContext);
}
void wave_close(void)
{
ctx_wave_close(g_wwContext);
}
static void set_le32(void *p, unsigned long n)
{
((unsigned char *) p) [0] = (unsigned char) n & (0xFF);
((unsigned char *) p) [1] = (unsigned char)(n >> 8) & (0xFF);
((unsigned char *) p) [2] = (unsigned char)(n >> 16) & (0xFF);
((unsigned char *) p) [3] = (unsigned char)(n >> 24) & (0xFF);
}
void *ctx_wave_open(long sample_rate, const char *filename)
{
struct Context *ctx = (struct Context*)malloc(sizeof(struct Context));
if(!ctx)
{
exit_with_error("Out of memory");
return NULL;
}
ctx->m_sample_count = 0;
ctx->m_sample_rate = sample_rate;
ctx->m_buf_pos = header_size;
ctx->m_chan_count = 1;
ctx->m_buf = (unsigned char *) malloc(buf_size);
if(!ctx->m_buf)
{
exit_with_error("Out of memory");
free(ctx);
return NULL;
}
#if !defined(_WIN32) || defined(__WATCOMC__)
ctx->m_file = fopen(filename, "wb");
#else
wchar_t widePath[MAX_PATH];
int size = MultiByteToWideChar(CP_UTF8, 0, filename, strlen(filename), widePath, MAX_PATH);
widePath[size] = '\0';
ctx->m_file = _wfopen(widePath, L"wb");
#endif
if(!ctx->m_file)
{
exit_with_error("Couldn't open WAVE file for writing");
free(ctx);
return NULL;
}
setvbuf(ctx->m_file, 0, _IOFBF, 32 * 1024L);
return ctx;
}
void ctx_wave_enable_stereo(void *ctx)
{
struct Context *wWriter = (struct Context *)ctx;
wWriter->m_chan_count = 2;
}
static void flush_(struct Context *ctx)
{
if(ctx->m_buf_pos && !fwrite(ctx->m_buf, (size_t)ctx->m_buf_pos, 1, ctx->m_file))
exit_with_error("Couldn't write WAVE data");
ctx->m_buf_pos = 0;
}
void ctx_wave_write(void *ctx, const short *in, long remain)
{
struct Context *wWriter = (struct Context *)ctx;
wWriter->m_sample_count += remain;
while(remain)
{
if(wWriter->m_buf_pos >= buf_size)
flush_(wWriter);
{
unsigned char *p = &wWriter->m_buf [wWriter->m_buf_pos];
long n = (buf_size - (unsigned long)wWriter->m_buf_pos) / sizeof(sample_t);
if(n > remain)
n = remain;
remain -= n;
/* convert to LSB first format */
while(n--)
{
int s = *in++;
*p++ = (unsigned char) s & (0x00FF);
*p++ = (unsigned char)(s >> 8) & (0x00FF);
}
wWriter->m_buf_pos = p - wWriter->m_buf;
assert(wWriter->m_buf_pos <= buf_size);
}
}
}
long ctx_wave_sample_count(void *ctx)
{
struct Context *wWriter = (struct Context *)ctx;
return wWriter->m_sample_count;
}
void ctx_wave_close(void *ctx)
{
struct Context *wWriter = (struct Context *)ctx;
if(!wWriter)
return;
if(wWriter->m_file)
{
/* generate header */
unsigned char h [header_size] =
{
'R', 'I', 'F', 'F',
0, 0, 0, 0, /* length of rest of file */
'W', 'A', 'V', 'E',
'f', 'm', 't', ' ',
0x10, 0, 0, 0, /* size of fmt chunk */
1, 0, /* uncompressed format */
0, 0, /* channel count */
0, 0, 0, 0, /* sample rate */
0, 0, 0, 0, /* bytes per second */
0, 0, /* bytes per sample frame */
16, 0, /* bits per sample */
'd', 'a', 't', 'a',
0, 0, 0, 0, /* size of sample data */
/* ... */ /* sample data */
};
long ds = wWriter->m_sample_count * (long)sizeof(sample_t);
int frame_size = wWriter->m_chan_count * (long)sizeof(sample_t);
set_le32(h + 0x04, header_size - 8 + ds);
h [0x16] = (unsigned char)wWriter->m_chan_count;
set_le32(h + 0x18, (unsigned long)wWriter->m_sample_rate);
set_le32(h + 0x1C, (unsigned long)wWriter->m_sample_rate * (unsigned long)frame_size);
h [0x20] = (unsigned char)frame_size;
set_le32(h + 0x28, (unsigned long)ds);
flush_(wWriter);
/* write header */
fseek(wWriter->m_file, 0, SEEK_SET);
fwrite(h, header_size, 1, wWriter->m_file);
fclose(wWriter->m_file);
wWriter->m_file = 0;
free(wWriter->m_buf);
wWriter->m_buf = 0;
}
free(wWriter);
}
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