예제 #1
0
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);
}
예제 #2
0
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);
}
예제 #3
0
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--;
            }
        }