C++ (Cpp) snd_rawmidi_kernel_write示例

示例#1

文件： seq_midi.c 项目： OS2World/DRV-UNIAUD

/* close associated midi device for output */
static int midisynth_unuse(void *private_data, snd_seq_port_subscribe_t *info)
{
	seq_midisynth_t *msynth = (seq_midisynth_t *)private_data;
	unsigned char buf = 0xff; /* MIDI reset */

	snd_assert(msynth->output_rfile.output != NULL, return -EINVAL);
	/* sending single MIDI reset message to shut the device up */
	snd_rawmidi_kernel_write(msynth->output_rfile.output, &buf, 1);
	snd_rawmidi_drain_output(msynth->output_rfile.output);
	return snd_rawmidi_kernel_release(&msynth->output_rfile);
}

示例#2

文件： seq_midi.c 项目： OS2World/DRV-UNIAUD

static int dump_midi(snd_rawmidi_substream_t *substream, const char *buf, int count)
{
	snd_rawmidi_runtime_t *runtime;
	int tmp;

	snd_assert(substream != NULL || buf != NULL, return -EINVAL);
	runtime = substream->runtime;
	if ((tmp = runtime->avail) < count) {
		snd_printk("warning, output event was lost (count = %i, available = %i)\n", count, tmp);
		return -ENOMEM;
	}
	if (snd_rawmidi_kernel_write(substream, buf, count) < count)
		return -EINVAL;
	return 0;
}

示例#3

文件： seq_midi.c 项目： 12rafael/jellytimekernel

static int dump_midi(struct snd_rawmidi_substream *substream, const char *buf, int count)
{
	struct snd_rawmidi_runtime *runtime;
	int tmp;

	if (snd_BUG_ON(!substream || !buf))
		return -EINVAL;
	runtime = substream->runtime;
	if ((tmp = runtime->avail) < count) {
		if (printk_ratelimit())
			snd_printk(KERN_ERR "MIDI output buffer overrun\n");
		return -ENOMEM;
	}
	if (snd_rawmidi_kernel_write(substream, buf, count) < count)
		return -EINVAL;
	return 0;
}