diff options
| author | Andreas Eversberg <jolly@eversberg.eu> | 2016-05-06 07:00:27 +0200 |
|---|---|---|
| committer | Andreas Eversberg <jolly@eversberg.eu> | 2016-05-08 15:49:45 +0200 |
| commit | bae12156a23bc18561a9fd81a550edfd988ef437 (patch) | |
| tree | d09c710de2692f17a5ec9e23e830be6e02e6fbf3 /src/common/sender.c | |
| parent | ba91ee82a77f9357758e64953da57d2a148b30c8 (diff) | |
common code: Add input gain option
Diffstat (limited to 'src/common/sender.c')
| -rw-r--r-- | src/common/sender.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/src/common/sender.c b/src/common/sender.c index c8e9b60..1038c8b 100644 --- a/src/common/sender.c +++ b/src/common/sender.c @@ -33,7 +33,7 @@ static sender_t **sender_tailp = &sender_head; int cant_recover = 0; /* Init transceiver instance and link to list of transceivers. */ -int sender_create(sender_t *sender, int kanal, const char *sounddev, int samplerate, int cross_channels, int pre_emphasis, int de_emphasis, const char *write_wave, const char *read_wave, int loopback, double loss_volume, int use_pilot_signal) +int sender_create(sender_t *sender, int kanal, const char *sounddev, int samplerate, int cross_channels, double rx_gain, int pre_emphasis, int de_emphasis, const char *write_wave, const char *read_wave, int loopback, double loss_volume, int use_pilot_signal) { sender_t *master; int rc = 0; @@ -91,6 +91,7 @@ int sender_create(sender_t *sender, int kanal, const char *sounddev, int sampler sender->samplerate = samplerate; sender->cross_channels = cross_channels; + sender->rx_gain = rx_gain; sender->pre_emphasis = pre_emphasis; sender->de_emphasis = de_emphasis; sender->kanal = kanal; @@ -189,6 +190,21 @@ static void gen_pilotton(sender_t *sender, int16_t *samples, int length) sender->pilotton_phase = phase; } +static void gain_samples(int16_t *samples, int length, double gain) +{ + int i; + int32_t sample; + + for (i = 0; i < length; i++) { + sample = (int32_t)((double)(*samples) * gain); + if (sample > 32767) + sample = 32767; + else if (sample < -32768) + sample = -32768; + *samples++ = sample; + } +} + /* Handle audio streaming of one transceiver. */ static void process_sender_audio(sender_t *sender, int *quit, int latspl) { @@ -318,6 +334,9 @@ cant_recover: return; } if (count) { + /* rx gain */ + if (sender->rx_gain != 1.0) + gain_samples(samples, count, sender->rx_gain); /* do de emphasis from radio (then write_wave/wave_read), receive audio, process echo test */ if (sender->de_emphasis) de_emphasis(&sender->estate, samples, count); @@ -332,6 +351,8 @@ cant_recover: jitter_save(&sender->audio, samples, count); /* do above for audio slave, if set */ if (slave) { + if (sender->rx_gain != 1.0) + gain_samples(slave_samples, count, slave->rx_gain); if (slave->de_emphasis) de_emphasis(&slave->estate, slave_samples, count); if (slave->wave_play.fp) |