Revision 9d10e6e6 libavcodec/ac3dec.c
| libavcodec/ac3dec.c | ||
|---|---|---|
| 154 | 154 |
int center_mix_level; ///< Center mix level index |
| 155 | 155 |
int surround_mix_level; ///< Surround mix level index |
| 156 | 156 |
float downmix_coeffs[AC3_MAX_CHANNELS][2]; ///< stereo downmix coefficients |
| 157 |
float downmix_coeff_sum[2]; ///< sum of downmix coeffs for each output channel |
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| 157 | 158 |
float dynamic_range[2]; ///< dynamic range |
| 158 | 159 |
int cpl_coords[AC3_MAX_CHANNELS][18]; ///< coupling coordinates |
| 159 | 160 |
int num_cpl_bands; ///< number of coupling bands |
| ... | ... | |
| 402 | 403 |
int nf = s->channel_mode - 4; |
| 403 | 404 |
s->downmix_coeffs[nf][0] = s->downmix_coeffs[nf+1][1] = smix; |
| 404 | 405 |
} |
| 406 |
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s->downmix_coeff_sum[0] = s->downmix_coeff_sum[1] = 0.0f; |
|
| 408 |
for(i=0; i<s->fbw_channels; i++) {
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s->downmix_coeff_sum[0] += s->downmix_coeffs[i][0]; |
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s->downmix_coeff_sum[1] += s->downmix_coeffs[i][1]; |
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} |
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| 405 | 412 |
} |
| 406 | 413 |
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| 407 | 414 |
/** |
| ... | ... | |
| 732 | 739 |
static void ac3_downmix(AC3DecodeContext *s) |
| 733 | 740 |
{
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| 734 | 741 |
int i, j; |
| 735 |
float v0, v1, s0, s1;
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| 742 |
float v0, v1; |
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| 736 | 743 |
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for(i=0; i<256; i++) {
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v0 = v1 = s0 = s1 = 0.0f;
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v0 = v1 = 0.0f; |
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for(j=0; j<s->fbw_channels; j++) {
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| 740 | 747 |
v0 += s->output[j][i] * s->downmix_coeffs[j][0]; |
| 741 | 748 |
v1 += s->output[j][i] * s->downmix_coeffs[j][1]; |
| 742 |
s0 += s->downmix_coeffs[j][0]; |
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s1 += s->downmix_coeffs[j][1]; |
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| 744 | 749 |
} |
| 745 |
v0 /= s0;
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v1 /= s1;
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|
| 750 |
v0 /= s->downmix_coeff_sum[0];
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v1 /= s->downmix_coeff_sum[1];
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| 747 | 752 |
if(s->output_mode == AC3_CHMODE_MONO) {
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| 748 | 753 |
s->output[0][i] = (v0 + v1) * LEVEL_MINUS_3DB; |
| 749 | 754 |
} else if(s->output_mode == AC3_CHMODE_STEREO) {
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