Revision 177fed4e
| libavcodec/ac3enc.c | ||
|---|---|---|
| 162 | 162 |
int loro_surround_mix_level; ///< Lo/Ro surround mix level code |
| 163 | 163 |
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| 164 | 164 |
int cutoff; ///< user-specified cutoff frequency, in Hz |
| 165 |
int bandwidth_code[AC3_MAX_CHANNELS]; ///< bandwidth code (0 to 60) (chbwcod)
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| 165 |
int bandwidth_code; ///< bandwidth code (0 to 60) (chbwcod)
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| 166 | 166 |
int nb_coefs[AC3_MAX_CHANNELS]; |
| 167 | 167 |
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| 168 | 168 |
int rematrixing_enabled; ///< stereo rematrixing enabled |
| ... | ... | |
| 1407 | 1407 |
/* bandwidth */ |
| 1408 | 1408 |
for (ch = 0; ch < s->fbw_channels; ch++) {
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| 1409 | 1409 |
if (s->exp_strategy[ch][blk] != EXP_REUSE) |
| 1410 |
put_bits(&s->pb, 6, s->bandwidth_code[ch]);
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| 1410 |
put_bits(&s->pb, 6, s->bandwidth_code); |
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| 1411 | 1411 |
} |
| 1412 | 1412 |
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| 1413 | 1413 |
/* exponents */ |
| ... | ... | |
| 2047 | 2047 |
*/ |
| 2048 | 2048 |
static av_cold void set_bandwidth(AC3EncodeContext *s) |
| 2049 | 2049 |
{
|
| 2050 |
int ch, bw_code;
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| 2050 |
int ch; |
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| 2051 | 2051 |
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| 2052 | 2052 |
if (s->cutoff) {
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| 2053 | 2053 |
/* calculate bandwidth based on user-specified cutoff frequency */ |
| 2054 | 2054 |
int fbw_coeffs; |
| 2055 | 2055 |
fbw_coeffs = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate; |
| 2056 |
bw_code = av_clip((fbw_coeffs - 73) / 3, 0, 60);
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| 2056 |
s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60);
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| 2057 | 2057 |
} else {
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| 2058 | 2058 |
/* use default bandwidth setting */ |
| 2059 |
bw_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2];
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| 2059 |
s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2];
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| 2060 | 2060 |
} |
| 2061 | 2061 |
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| 2062 | 2062 |
/* set number of coefficients for each channel */ |
| 2063 | 2063 |
for (ch = 0; ch < s->fbw_channels; ch++) {
|
| 2064 |
s->bandwidth_code[ch] = bw_code; |
|
| 2065 |
s->nb_coefs[ch] = bw_code * 3 + 73; |
|
| 2064 |
s->nb_coefs[ch] = s->bandwidth_code * 3 + 73; |
|
| 2066 | 2065 |
} |
| 2067 | 2066 |
if (s->lfe_on) |
| 2068 | 2067 |
s->nb_coefs[s->lfe_channel] = 7; /* LFE channel always has 7 coefs */ |
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