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Merge pull request #192 from robho/share_buffer_memory

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Share memory between fm buffer and temporary buffer
This commit is contained in:
Benjamin Larsson
2015-10-18 19:57:12 +02:00
parent 01635c7617 5b4ec0e1fe
commit 970f4228de
1 changed files with 9 additions and 5 deletions
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14
src/rtl_433.c
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@@ -46,8 +46,11 @@ struct dm_state {
FILE *out_file;
int32_t level_limit;
int16_t am_buf[MAXIMAL_BUF_LENGTH]; // AM demodulated signal (for OOK decoding)
int16_t fm_buf[MAXIMAL_BUF_LENGTH]; // FM demodulated signal (for FSK decoding)
uint16_t temp_buf[MAXIMAL_BUF_LENGTH]; // Temporary buffer (to be optimized out..)
union {
// These buffers aren't used at the same time, so let's use a union to save some memory
int16_t fm_buf[MAXIMAL_BUF_LENGTH]; // FM demodulated signal (for FSK decoding)
uint16_t temp_buf[MAXIMAL_BUF_LENGTH]; // Temporary buffer (to be optimized out..)
};
FilterState lowpass_filter_state;
DemodFM_State demod_FM_state;
int enable_FM_demod;
@@ -640,13 +643,14 @@ static void rtlsdr_callback(unsigned char *iq_buf, uint32_t len, void *ctx) {
demod->sg_index = 0;
}
// AM demodulation
envelope_detect(iq_buf, demod->temp_buf, len/2);
baseband_low_pass_filter(demod->temp_buf, demod->am_buf, len/2, &demod->lowpass_filter_state);
// FM demodulation
if (demod->enable_FM_demod) {
baseband_demod_FM(iq_buf, demod->fm_buf, len/2, &demod->demod_FM_state);
}
// AM demodulation
envelope_detect(iq_buf, demod->temp_buf, len/2);
baseband_low_pass_filter(demod->temp_buf, demod->am_buf, len/2, &demod->lowpass_filter_state);
// Handle special input formats
if(!demod->out_file) { // If output file is specified we always assume I/Q input