int handleoutput(struct bat *bat, void *buffer, int bytes, int frames)
{
int err = 0;
/* If capture completed, terminate the playback */
if (bat->periods_played * frames > 2 * bat->rate
&& bat->latency.is_capturing == false)
return bat->latency.state;
if (bat->latency.state == LATENCY_STATE_PLAY_AND_LISTEN)
err = generate_sine_wave(bat, frames, buffer);
else
/* Output silence */
memset(buffer, 0, bytes);
return err;
}
/*
* Generate buffer to be played either from input file or from generated data
* Return value
* <0 error
* 0 ok
* >0 break
*/
static int generate_input_data(struct pcm_container *sndpcm, int bytes,
struct bat *bat)
{
int err;
static int load;
int frames = bytes * 8 / sndpcm->frame_bits;
if (bat->playback.file != NULL) {
/* From input file */
load = 0;
while (1) {
err = fread(sndpcm->buffer + load, 1,
bytes - load, bat->fp);
if (0 == err) {
if (feof(bat->fp)) {
fprintf(bat->log,
_("End of playing.\n"));
return 1;
}
} else if (err < bytes - load) {
if (ferror(bat->fp)) {
fprintf(bat->err, _("Read file error"));
fprintf(bat->err, _(": %d\n"), err);
return -EIO;
}
load += err;
} else {
break;
}
}
} else {
/* Generate sine wave */
if ((bat->sinus_duration) && (load > bat->sinus_duration))
return 1;
err = generate_sine_wave(bat, frames, (void *)sndpcm->buffer);
if (err != 0)
return err;
load += frames;
}
return 0;
}
/*
* Generate buffer to be played either from input file or from generated data
* Return value
* <0 error
* 0 ok
* >0 break
*/
static int generate_input_data(struct snd_pcm_container sndpcm, int count,
struct bat *bat)
{
int err;
static int load;
if (bat->playback.file != NULL) {
/* From input file */
load = 0;
while (1) {
err = fread(sndpcm.buffer + load, 1,
count - load, bat->fp);
if (0 == err) {
if (feof(bat->fp)) {
printf("End of playing.\n");
return 1;
}
}
if (err < count - load) {
if (ferror(bat->fp)) {
loge(E_READFILE, "%d", err);
return -1;
}
load += err;
} else {
break;
}
}
} else {
/* Generate sine wave */
if ((bat->sinus_duration) && (load > bat->sinus_duration))
return 1;
void *buf;
int max;
/* Due to float conversion later on we need to get some margin
* on max value in order to avoid sign inversion */
switch (bat->sample_size) {
case 1:
buf = (int8_t *) sndpcm.buffer;
max = INT8_MAX - 1;
break;
case 2:
buf = (int16_t *) sndpcm.buffer;
max = INT16_MAX - 10;
break;
case 3:
buf = (int8_t *) sndpcm.buffer;
max = (1 << 23) - 50;
break;
case 4:
buf = (int32_t *) sndpcm.buffer;
max = INT32_MAX - 100;
break;
default:
loge(E_PARAMS S_PCMFORMAT, "size=%d", bat->sample_size);
return -1;
}
generate_sine_wave(bat, count * 8 / sndpcm.frame_bits,
buf, max);
load += (count * 8 / sndpcm.frame_bits);
}
bat->periods_played++;
return 0;
}
