|
|
|
/**
|
|
|
|
*@brief Uninitialize the decoder and free all resources.
|
|
|
|
*@param avctx codec context
|
|
|
|
*@return 0 on success, < 0 otherwise
|
|
|
|
*/
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
|
|
{
|
|
|
|
WMA3DecodeContext *s = avctx->priv_data;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
av_freep(&s->num_sfb);
|
|
|
|
av_freep(&s->sfb_offsets);
|
|
|
|
av_freep(&s->subwoofer_cutoffs);
|
|
|
|
av_freep(&s->sf_offsets);
|
|
|
|
|
|
|
|
for (i = 0 ; i < WMAPRO_BLOCK_SIZES ; i++)
|
|
|
|
ff_mdct_end(&s->mdct_ctx[i]);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
*@brief Calculate a decorrelation matrix from the bitstream parameters.
|
|
|
|
*@param s codec context
|
|
|
|
*@param chgroup channel group for which the matrix needs to be calculated
|
|
|
|
*/
|
|
|
|
static void decode_decorrelation_matrix(WMA3DecodeContext *s,
|
|
|
|
WMA3ChannelGroup *chgroup)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
int offset = 0;
|
|
|
|
int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
|
|
|
|
memset(chgroup->decorrelation_matrix,0,
|
|
|
|
sizeof(float) *s->num_channels * s->num_channels);
|
|
|
|
|
|
|
|
for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
|
|
|
|
rotation_offset[i] = get_bits(&s->gb,6);
|
|
|
|
|
|
|
|
for (i = 0; i < chgroup->num_channels; i++)
|
|
|
|
chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
|
|
|
|
get_bits1(&s->gb) ? 1.0 : -1.0;
|
|
|
|
|
|
|
|
for (i = 1; i < chgroup->num_channels; i++) {
|
|
|
|
int x;
|
|
|
|
for (x = 0; x < i; x++) {
|
|
|
|
int y;
|
|
|
|
for (y = 0; y < i + 1 ; y++) {
|
|
|
|
float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
|
|
|
|
float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
|
|
|
|
int n = rotation_offset[offset + x];
|
|
|
|
float sinv;
|
|
|
|
float cosv;
|
|
|
|
|
|
|
|
if (n < 32) {
|
|
|
|
sinv = sin64[n];
|
|
|
|
cosv = sin64[32-n];
|
|
|
|
} else {
|
|
|
|
sinv = sin64[64-n];
|
|
|
|
cosv = -sin64[n-32];
|
|
|
|
}
|
|
|
|
|
|
|
|
chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
|
|
|
|
(v1 * sinv) - (v2 * cosv);
|
|
|
|
chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
|
|
|
|
(v1 * cosv) + (v2 * sinv);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
offset += i;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
*@brief Reconstruct the individual channel data.
|
|
|
|
*@param s codec context
|
|
|
|
*/
|
|
|
|
static void inverse_channel_transform(WMA3DecodeContext *s)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < s->num_chgroups; i++) {
|
|
|
|
|
|
|
|
if (s->chgroup[i].transform == 1) {
|
|
|
|
/** M/S stereo decoding */
|
|
|
|
int16_t* sfb_offsets = s->cur_sfb_offsets;
|
|
|
|
float* ch0 = *sfb_offsets + s->channel[0].coeffs;
|
|
|
|
float* ch1 = *sfb_offsets++ + s->channel[1].coeffs;
|
|
|
|
const char* tb = s->chgroup[i].transform_band;
|
|
|
|
const char* tb_end = tb + s->num_bands;
|
|
|
|
|
|
|
|
while (tb < tb_end) {
|
|
|
|
const float* ch0_end = s->channel[0].coeffs +
|
|
|
|
FFMIN(*sfb_offsets,s->subframe_len);
|
|
|
|
if (*tb++ == 1) {
|
|
|
|
while (ch0 < ch0_end) {
|
|
|
|
const float v1 = *ch0;
|
|
|
|
const float v2 = *ch1;
|
|
|
|
*ch0++ = v1 - v2;
|
|
|
|
*ch1++ = v1 + v2;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
while (ch0 < ch0_end) {
|
|
|
|
*ch0++ *= 181.0 / 128;
|
|
|
|
*ch1++ *= 181.0 / 128;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
++sfb_offsets;
|
|
|
|
}
|
|
|
|
} else if (s->chgroup[i].transform) {
|
|
|
|
float data[WMAPRO_MAX_CHANNELS];
|
|
|
|
const int num_channels = s->chgroup[i].num_channels;
|
|
|
|
float** ch_data = s->chgroup[i].channel_data;
|
|
|
|
float** ch_end = ch_data + num_channels;
|
|
|
|
const int8_t* tb = s->chgroup[i].transform_band;
|
|
|
|
int16_t* sfb;
|
|
|
|
|
|
|
|
/** multichannel decorrelation */
|
|
|
|
for (sfb = s->cur_sfb_offsets ;
|
|
|
|
sfb < s->cur_sfb_offsets + s->num_bands;sfb++) {
|
|
|
|
if (*tb++ == 1) {
|
|
|
|
int y;
|
|
|
|
/** multiply values with the decorrelation_matrix */
|
|
|
|
for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) {
|
|
|
|
const float* mat = s->chgroup[i].decorrelation_matrix;
|
|
|
|
const float* data_end = data + num_channels;
|
|
|
|
float* data_ptr = data;
|
|
|
|
float** ch;
|
|
|
|
|
|
|
|
for (ch = ch_data;ch < ch_end; ch++)
|
|
|
|
*data_ptr++ = (*ch)[y];
|
|
|
|
|
|
|
|
for (ch = ch_data; ch < ch_end; ch++) {
|
|
|
|
float sum = 0;
|
|
|
|
data_ptr = data;
|
|
|
|
while (data_ptr < data_end)
|
|
|
|
sum += *data_ptr++ * *mat++;
|
|
|
|
|
|
|
|
(*ch)[y] = sum;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|