typedef struct NellyMoserDecodeContext {
AVCodecContext* avctx;
DECLARE_ALIGNED_16(float,float_buf[NELLY_SAMPLES]);
- float state[64];
+ float state[128];
AVRandomState random_state;
GetBitContext gb;
int add_bias;
- int scale_bias;
+ float scale_bias;
DSPContext dsp;
MDCTContext imdct_ctx;
DECLARE_ALIGNED_16(float,imdct_tmp[NELLY_BUF_LEN]);
DECLARE_ALIGNED_16(float,imdct_out[NELLY_BUF_LEN * 2]);
} NellyMoserDecodeContext;
-DECLARE_ALIGNED_16(float,sine_window[128]);
+static DECLARE_ALIGNED_16(float,sine_window[128]);
static inline int signed_shift(int i, int shift) {
if (shift > 0)
return i >> -shift;
}
-static void overlap_and_window(NellyMoserDecodeContext *s, float *state, float *audio)
+
+static void overlap_and_window(NellyMoserDecodeContext *s, float *state, float *audio, float *a_in)
{
- int bot, mid_up, mid_down, top;
- float s_bot, s_top;
+ int bot, top;
bot = 0;
top = NELLY_BUF_LEN-1;
- mid_up = NELLY_BUF_LEN/2;
- mid_down = (NELLY_BUF_LEN/2)-1;
-
- while (bot < NELLY_BUF_LEN/4) {
- s_bot = audio[bot];
- s_top = audio[top];
- audio[bot] = (audio[mid_up]*sine_window[bot]-state[bot ]*sine_window[top])/s->scale_bias + s->add_bias;
- audio[top] = (-state[bot ]*sine_window[bot]-audio[mid_up]*sine_window[top])/s->scale_bias + s->add_bias;
- state[bot] = audio[mid_down];
- audio[mid_down] = (s_top *sine_window[mid_down]-state[mid_down]*sine_window[mid_up])/s->scale_bias + s->add_bias;
- audio[mid_up ] = (-state[mid_down]*sine_window[mid_down]-s_top *sine_window[mid_up])/s->scale_bias + s->add_bias;
- state[mid_down] = s_bot;
+ while (bot < NELLY_BUF_LEN) {
+ audio[bot] = a_in [bot]*sine_window[bot]
+ +state[bot]*sine_window[top] + s->add_bias;
bot++;
- mid_up++;
- mid_down--;
top--;
}
+ memcpy(state, a_in + NELLY_BUF_LEN, sizeof(float)*NELLY_BUF_LEN);
}
static int sum_bits(short *buf, short shift, short off)
}
}
-void nelly_decode_block(NellyMoserDecodeContext *s, unsigned char block[NELLY_BLOCK_LEN], float audio[NELLY_SAMPLES])
+void nelly_decode_block(NellyMoserDecodeContext *s, const unsigned char block[NELLY_BLOCK_LEN], float audio[NELLY_SAMPLES])
{
int i,j;
float buf[NELLY_FILL_LEN], pows[NELLY_FILL_LEN];
float *aptr, *bptr, *pptr, val, pval;
int bits[NELLY_BUF_LEN];
unsigned char v;
- float a;
init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
for (i=0 ; i<NELLY_BANDS ; i++) {
if (i > 0)
val += nelly_delta_table[get_bits(&s->gb, 5)];
- pval = pow(2, val/2048);
+ pval = -pow(2, val/2048) * s->scale_bias;
for (j = 0; j < nelly_band_sizes_table[i]; j++) {
*bptr++ = val;
*pptr++ = pval;
aptr, s->imdct_tmp);
/* XXX: overlapping and windowing should be part of a more
generic imdct function */
- a = 1.0 / 8.0;
- for(j = 0; j < NELLY_BUF_LEN / 2; j++) {
- aptr[j] = s->imdct_out[j + NELLY_BUF_LEN + NELLY_BUF_LEN / 2] * a;
- aptr[j + NELLY_BUF_LEN / 2] = -s->imdct_out[j] * a;
- }
- overlap_and_window(s, s->state, aptr);
+ overlap_and_window(s, s->state, aptr, s->imdct_out);
}
}
-static int decode_init(AVCodecContext * avctx) {
+static av_cold int decode_init(AVCodecContext * avctx) {
NellyMoserDecodeContext *s = avctx->priv_data;
int i;
if(s->dsp.float_to_int16 == ff_float_to_int16_c) {
s->add_bias = 385;
- s->scale_bias = 32768;
+ s->scale_bias = 1.0/(8*32768);
} else {
s->add_bias = 0;
- s->scale_bias = 1;
+ s->scale_bias = 1.0/(1*8);
}
/* Generate overlap window */
static int decode_tag(AVCodecContext * avctx,
void *data, int *data_size,
- uint8_t * buf, int buf_size) {
+ const uint8_t * buf, int buf_size) {
NellyMoserDecodeContext *s = avctx->priv_data;
int blocks, i;
int16_t* samples;
blocks = 2; break;
case 256: // 22050Hz
blocks = 4; break;
+ case 512: // 44100Hz
+ blocks = 8; break;
default:
- av_log(avctx, AV_LOG_DEBUG, "Tag size %d unknown, report sample!\n", buf_size);
+ av_log(avctx, AV_LOG_ERROR, "Tag size %d unknown, report sample!\n", buf_size);
return buf_size;
}
return buf_size;
}
-static int decode_end(AVCodecContext * avctx) {
+static av_cold int decode_end(AVCodecContext * avctx) {
NellyMoserDecodeContext *s = avctx->priv_data;
ff_mdct_end(&s->imdct_ctx);