diff options
| -rw-r--r-- | tinyplay.c | 52 |
1 files changed, 52 insertions, 0 deletions
@@ -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", |