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dcadec: store the stereo downmix coefficients as float in the DCAContext.

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The 7-bit codes previously used are absent from the ETSI 102 114 V1.4.1 spec.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
pull/49/head
Tim Walker 11 years ago committed by Anton Khirnov
parent 89de5157b1
commit 25609b63d2
1 changed files with 8 additions and 14 deletions
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  1. 22
      libavcodec/dcadec.c

22
libavcodec/dcadec.c
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@ -337,7 +337,7 @@ typedef struct {
int scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][2]; ///< scale factors (2 if transient)
int joint_huff[DCA_PRIM_CHANNELS_MAX]; ///< joint subband scale factors codebook
int joint_scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< joint subband scale factors
int downmix_coef[DCA_PRIM_CHANNELS_MAX][2]; ///< stereo downmix coefficients
float downmix_coef[DCA_PRIM_CHANNELS_MAX][2]; ///< stereo downmix coefficients
int dynrange_coef; ///< dynamic range coefficient
int high_freq_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< VQ encoded high frequency subbands
@ -802,8 +802,8 @@ static int dca_subframe_header(DCAContext *s, int base_channel, int block_index)
if (!base_channel && s->prim_channels > 2) {
if (s->downmix) {
for (j = base_channel; j < s->prim_channels; j++) {
s->downmix_coef[j][0] = get_bits(&s->gb, 7);
s->downmix_coef[j][1] = get_bits(&s->gb, 7);
s->downmix_coef[j][0] = dca_downmix_coeffs[get_bits(&s->gb, 7)];
s->downmix_coef[j][1] = dca_downmix_coeffs[get_bits(&s->gb, 7)];
}
} else {
int am = s->amode & DCA_CHANNEL_MASK;
@ -819,8 +819,8 @@ static int dca_subframe_header(DCAContext *s, int base_channel, int block_index)
}
for (j = base_channel; j < s->prim_channels; j++) {
s->downmix_coef[j][0] = dca_default_coeffs[am][j][0];
s->downmix_coef[j][1] = dca_default_coeffs[am][j][1];
s->downmix_coef[j][0] = dca_downmix_coeffs[dca_default_coeffs[am][j][0]];
s->downmix_coef[j][1] = dca_downmix_coeffs[dca_default_coeffs[am][j][1]];
}
}
}
@ -923,9 +923,9 @@ static int dca_subframe_header(DCAContext *s, int base_channel, int block_index)
av_log(s->avctx, AV_LOG_DEBUG, "Downmix coeffs:\n");
for (j = 0; j < s->prim_channels; j++) {
av_log(s->avctx, AV_LOG_DEBUG, "Channel 0, %d = %f\n", j,
dca_downmix_coeffs[s->downmix_coef[j][0]]);
s->downmix_coef[j][0]);
av_log(s->avctx, AV_LOG_DEBUG, "Channel 1, %d = %f\n", j,
dca_downmix_coeffs[s->downmix_coef[j][1]]);
s->downmix_coef[j][1]);
}
av_log(s->avctx, AV_LOG_DEBUG, "\n");
}
@ -1024,18 +1024,12 @@ static void lfe_interpolation_fir(DCAContext *s, int decimation_select,
}
static void dca_downmix(float **samples, int srcfmt,
int downmix_coef[DCA_PRIM_CHANNELS_MAX][2],
float coef[DCA_PRIM_CHANNELS_MAX][2],
const int8_t *channel_mapping)
{
int c, l, r, sl, sr, s;
int i;
float t, u, v;
float coef[DCA_PRIM_CHANNELS_MAX][2];
for (i = 0; i < DCA_PRIM_CHANNELS_MAX; i++) {
coef[i][0] = dca_downmix_coeffs[downmix_coef[i][0]];
coef[i][1] = dca_downmix_coeffs[downmix_coef[i][1]];
}
switch (srcfmt) {
case DCA_MONO:

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