diff options
Diffstat (limited to 'libavfilter/af_hdcd.c')
-rw-r--r-- | libavfilter/af_hdcd.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/libavfilter/af_hdcd.c b/libavfilter/af_hdcd.c index 641076aa7f..a8a3d59448 100644 --- a/libavfilter/af_hdcd.c +++ b/libavfilter/af_hdcd.c @@ -871,6 +871,7 @@ typedef struct { * a code. -1 for timer never set. */ int count_sustain_expired; + int rate; /**< sampling rate */ int _ana_snb; /**< used in the analyze mode tone generator */ } hdcd_state; @@ -1026,6 +1027,7 @@ static void hdcd_reset(hdcd_state *state, unsigned rate, unsigned cdt_ms) state->max_gain = 0; state->count_sustain_expired = -1; + state->rate = rate; state->_ana_snb = 0; } @@ -1297,7 +1299,8 @@ static int hdcd_scan_stereo(HDCDContext *ctx, const int32_t *samples, int max) /** replace audio with solid tone, but save LSBs */ static void hdcd_analyze_prepare(hdcd_state *state, int32_t *samples, int count, int stride) { - int n; + int n, f = 300; + int so = state->rate / f; for (n = 0; n < count * stride; n += stride) { /* in analyze mode, the audio is replaced by a solid tone, and * amplitude is changed to signal when the specified feature is @@ -1306,9 +1309,9 @@ static void hdcd_analyze_prepare(hdcd_state *state, int32_t *samples, int count, * bit 1: Original sample was above PE level */ int32_t save = (abs(samples[n]) - PEAK_EXT_LEVEL >= 0) ? 2 : 0; /* above PE level */ save |= samples[n] & 1; /* save LSB for HDCD packets */ - samples[n] = TONEGEN16(state->_ana_snb, 277.18, 44100, 0.1); + samples[n] = TONEGEN16(state->_ana_snb, f, state->rate, 0.1); samples[n] = (samples[n] | 3) ^ ((~save) & 3); - if (++state->_ana_snb > 0x3fffffff) state->_ana_snb = 0; + if (++state->_ana_snb > so) state->_ana_snb = 0; } } |