static void sdk_draw_utils_rgb24_to_gray8(
unsigned char r,
unsigned char g,
unsigned char b,
unsigned char *gray)
{
float grayf;
grayf = (0.299f * (float)r + 0.587f * (float)g + 0.114f * (float)b);
*gray = CLIP8(grayf);
}
static void sdk_draw_utils_rgb24_to_yuv24(
unsigned char r,
unsigned char g,
unsigned char b,
unsigned char *y,
unsigned char *u,
unsigned char *v)
{
float yf;
float uf;
float vf;
yf = ( 0.2990f * (float)r) + ( 0.5870f * (float)g) + ( 0.1140f * (float)b);
uf = (-0.1687f * (float)r) + (-0.3313f * (float)g) + ( 0.5000f * (float)b) + 128.0f;
vf = ( 0.5000f * (float)r) + (-0.4187f * (float)g) + (-0.0813f * (float)b) + 128.0f;
*y = CLIP8(yf);
*u = CLIP8(uf);
*v = CLIP8(vf);
}
static int ws_snd_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
// WSSNDContext *c = avctx->priv_data;
int in_size, out_size;
int sample = 0;
int i;
short *samples = data;
if (!buf_size)
return 0;
out_size = AV_RL16(&buf[0]);
*data_size = out_size * 2;
in_size = AV_RL16(&buf[2]);
buf += 4;
if (out_size > *data_size) {
av_log(avctx, AV_LOG_ERROR, "Frame is too large to fit in buffer\n");
return -1;
}
if (in_size > buf_size) {
av_log(avctx, AV_LOG_ERROR, "Frame data is larger than input buffer\n");
return -1;
}
if (in_size == out_size) {
for (i = 0; i < out_size; i++)
*samples++ = (*buf++ - 0x80) << 8;
return buf_size;
}
while (out_size > 0) {
int code;
uint8_t count;
code = (*buf) >> 6;
count = (*buf) & 0x3F;
buf++;
switch(code) {
case 0: /* ADPCM 2-bit */
for (count++; count > 0; count--) {
code = *buf++;
sample += ws_adpcm_2bit[code & 0x3];
CLIP8(sample);
*samples++ = sample << 8;
sample += ws_adpcm_2bit[(code >> 2) & 0x3];
CLIP8(sample);
*samples++ = sample << 8;
sample += ws_adpcm_2bit[(code >> 4) & 0x3];
CLIP8(sample);
*samples++ = sample << 8;
sample += ws_adpcm_2bit[(code >> 6) & 0x3];
CLIP8(sample);
*samples++ = sample << 8;
out_size -= 4;
}
break;
case 1: /* ADPCM 4-bit */
for (count++; count > 0; count--) {
code = *buf++;
sample += ws_adpcm_4bit[code & 0xF];
CLIP8(sample);
*samples++ = sample << 8;
sample += ws_adpcm_4bit[code >> 4];
CLIP8(sample);
*samples++ = sample << 8;
out_size -= 2;
}
break;
case 2: /* no compression */
if (count & 0x20) { /* big delta */
char t;
t = count;
t <<= 3;
sample += t >> 3;
*samples++ = sample << 8;
out_size--;
} else { /* copy */
for (count++; count > 0; count--) {
*samples++ = (*buf++ - 0x80) << 8;
out_size--;
}
sample = buf[-1] - 0x80;
}
break;
default: /* run */
for(count++; count > 0; count--) {
*samples++ = sample << 8;
out_size--;
}
}