93 static u32 int_goertzel(s16 x[], u32 N, u32 freq)  in int_goertzel()  argument
107 	for (i = 0; i < N; i++) {  in int_goertzel()
121 	divisor = N * N;  in int_goertzel()
127 static u32 freq_magnitude(s16 x[], u32 N, u32 freq)  in freq_magnitude()  argument
129 	u32 sum = int_goertzel(x, N, freq);  in freq_magnitude()
134 static u32 noise_magnitude(s16 x[], u32 N, u32 freq_start, u32 freq_end)  in noise_magnitude()  argument
141 	if (N > 192) {  in noise_magnitude()
143 		x += (N - 192);  in noise_magnitude()
144 		N = 192;  in noise_magnitude()
150 		sum += int_goertzel(x, N, freq_start);  in noise_magnitude()
157 static s32 detect_a2_a2m_eiaj(struct cx88_core *core, s16 x[], u32 N)  in detect_a2_a2m_eiaj()  argument
186 	carrier = freq_magnitude(x, N, carrier_freq);  in detect_a2_a2m_eiaj()
187 	stereo  = freq_magnitude(x, N, stereo_freq);  in detect_a2_a2m_eiaj()
188 	dual    = freq_magnitude(x, N, dual_freq);  in detect_a2_a2m_eiaj()
189 	noise   = noise_magnitude(x, N, FREQ_NOISE_START, FREQ_NOISE_END);  in detect_a2_a2m_eiaj()
224 static s32 detect_btsc(struct cx88_core *core, s16 x[], u32 N)  in detect_btsc()  argument
226 	s32 sap_ref = freq_magnitude(x, N, FREQ_BTSC_SAP_REF);  in detect_btsc()
227 	s32 sap = freq_magnitude(x, N, FREQ_BTSC_SAP);  in detect_btsc()
228 	s32 dual_ref = freq_magnitude(x, N, FREQ_BTSC_DUAL_REF);  in detect_btsc()
229 	s32 dual = freq_magnitude(x, N, FREQ_BTSC_DUAL);  in detect_btsc()
237 static s16 *read_rds_samples(struct cx88_core *core, u32 *N)  in read_rds_samples()  argument
259 	*N = sample_count;  in read_rds_samples()
275 	u32 N = 0;  in cx88_dsp_detect_stereo_sap()  local
288 	samples = read_rds_samples(core, &N);  in cx88_dsp_detect_stereo_sap()
298 		ret = detect_a2_a2m_eiaj(core, samples, N);  in cx88_dsp_detect_stereo_sap()
301 		ret = detect_btsc(core, samples, N);  in cx88_dsp_detect_stereo_sap()