/**
* Finalize MDCT and free allocated memory.
+ *
+ * @param s AC-3 encoder private context
*/
av_cold void ff_ac3_float_mdct_end(AC3EncodeContext *s)
{
/**
* Initialize MDCT tables.
- * @param nbits log2(MDCT size)
+ *
+ * @param s AC-3 encoder private context
+ * @return 0 on success, negative error code on failure
*/
av_cold int ff_ac3_float_mdct_init(AC3EncodeContext *s)
{
}
-/**
+/*
* Apply KBD window to input samples prior to MDCT.
*/
static void apply_window(DSPContext *dsp, float *output, const float *input,
}
-/**
+/*
* Normalize the input samples.
* Not needed for the floating-point encoder.
*/
}
-/**
+/*
* Scale MDCT coefficients from float to 24-bit fixed-point.
*/
static void scale_coefficients(AC3EncodeContext *s)
{
int chan_size = AC3_MAX_COEFS * s->num_blocks;
- s->ac3dsp.float_to_fixed24(s->fixed_coef_buffer + chan_size,
- s->mdct_coef_buffer + chan_size,
- chan_size * s->channels);
+ int cpl = s->cpl_on;
+ s->ac3dsp.float_to_fixed24(s->fixed_coef_buffer + (chan_size * !cpl),
+ s->mdct_coef_buffer + (chan_size * !cpl),
+ chan_size * (s->channels + cpl));
}
+static void sum_square_butterfly(AC3EncodeContext *s, float sum[4],
+ const float *coef0, const float *coef1,
+ int len)
+{
+ s->ac3dsp.sum_square_butterfly_float(sum, coef0, coef1, len);
+}
-/**
+/*
* Clip MDCT coefficients to allowable range.
*/
static void clip_coefficients(DSPContext *dsp, float *coef, unsigned int len)
}
+/*
+ * Calculate a single coupling coordinate.
+ */
+static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
+{
+ float coord = 0.125;
+ if (energy_cpl > 0)
+ coord *= sqrtf(energy_ch / energy_cpl);
+ return FFMIN(coord, COEF_MAX);
+}
+
+
#if CONFIG_AC3_ENCODER
AVCodec ff_ac3_encoder = {
.name = "ac3",