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Merge pull request #22 from roml/errmsg

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tinyplay: Make error messages more meaningful
This commit is contained in:
Simon Wilson
2012-12-14 15:27:20 -08:00
parent bb234d9dba 7a12d9cb24
commit 6bfa2620fb
1 changed files with 52 additions and 0 deletions
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tinyplay.c
+52
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@@ -160,6 +160,54 @@ int main(int argc, char **argv)
return 0;
}
int check_param(struct pcm_params *params, unsigned int param, unsigned int value,
char *param_name, char *param_unit)
{
unsigned int min;
unsigned int max;
int is_within_bounds = 1;
min = pcm_params_get_min(params, param);
if (value < min) {
fprintf(stderr, "%s is %u%s, device only supports >= %u%s\n", param_name, value,
param_unit, min, param_unit);
is_within_bounds = 0;
}
max = pcm_params_get_max(params, param);
if (value > max) {
fprintf(stderr, "%s is %u%s, device only supports <= %u%s\n", param_name, value,
param_unit, max, param_unit);
is_within_bounds = 0;
}
return is_within_bounds;
}
int sample_is_playable(unsigned int card, unsigned int device, unsigned int channels,
unsigned int rate, unsigned int bits, unsigned int period_size,
unsigned int period_count)
{
struct pcm_params *params;
int can_play;
params = pcm_params_get(card, device, PCM_OUT);
if (params == NULL) {
fprintf(stderr, "Unable to open PCM device %u.\n", device);
return 0;
}
can_play = check_param(params, PCM_PARAM_RATE, rate, "Sample rate", "Hz");
can_play &= check_param(params, PCM_PARAM_CHANNELS, channels, "Sample", " channels");
can_play &= check_param(params, PCM_PARAM_SAMPLE_BITS, bits, "Bitrate", " bits");
can_play &= check_param(params, PCM_PARAM_PERIOD_SIZE, period_size, "Period size", "Hz");
can_play &= check_param(params, PCM_PARAM_PERIODS, period_count, "Period count", "Hz");
pcm_params_free(params);
return can_play;
}
void play_sample(FILE *file, unsigned int card, unsigned int device, unsigned int channels,
unsigned int rate, unsigned int bits, unsigned int period_size,
unsigned int period_count)
@@ -182,6 +230,10 @@ void play_sample(FILE *file, unsigned int card, unsigned int device, unsigned in
config.stop_threshold = 0;
config.silence_threshold = 0;
if (!sample_is_playable(card, device, channels, rate, bits, period_size, period_count)) {
return;
}
pcm = pcm_open(card, device, PCM_OUT, &config);
if (!pcm || !pcm_is_ready(pcm)) {
fprintf(stderr, "Unable to open PCM device %u (%s)\n",