示例#1
0
/*
 * Callback for completed capture URB.
 */
static void audio_in_callback(struct urb *urb)
{
	int i, index, length = 0, shutdown = 0;
	unsigned long flags;

	struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;

	line6pcm->in.last_frame = urb->start_frame;

	/* find index of URB */
	for (index = 0; index < line6pcm->line6->iso_buffers; ++index)
		if (urb == line6pcm->in.urbs[index])
			break;

	spin_lock_irqsave(&line6pcm->in.lock, flags);

	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
		char *fbuf;
		int fsize;
		struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];

		if (fin->status == -EXDEV) {
			shutdown = 1;
			break;
		}

		fbuf = urb->transfer_buffer + fin->offset;
		fsize = fin->actual_length;

		if (fsize > line6pcm->max_packet_size_in) {
			dev_err(line6pcm->line6->ifcdev,
				"driver and/or device bug: packet too large (%d > %d)\n",
				fsize, line6pcm->max_packet_size_in);
		}

		length += fsize;

		BUILD_BUG_ON_MSG(LINE6_ISO_PACKETS != 1,
			"The following code assumes LINE6_ISO_PACKETS == 1");
		/* TODO:
		 * Also, if iso_buffers != 2, the prev frame is almost random at
		 * playback side.
		 * This needs to be redesigned. It should be "stable", but we may
		 * experience sync problems on such high-speed configs.
		 */

		line6pcm->prev_fbuf = fbuf;
		line6pcm->prev_fsize = fsize /
			(line6pcm->properties->bytes_per_channel *
			line6pcm->properties->capture_hw.channels_max);

		if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) &&
		    test_bit(LINE6_STREAM_PCM, &line6pcm->in.running) &&
		    fsize > 0)
			line6_capture_copy(line6pcm, fbuf, fsize);
	}

	clear_bit(index, &line6pcm->in.active_urbs);

	if (test_and_clear_bit(index, &line6pcm->in.unlink_urbs))
		shutdown = 1;

	if (!shutdown) {
		submit_audio_in_urb(line6pcm);

		if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) &&
		    test_bit(LINE6_STREAM_PCM, &line6pcm->in.running))
			line6_capture_check_period(line6pcm, length);
	}

	spin_unlock_irqrestore(&line6pcm->in.lock, flags);
}
示例#2
0
文件: capture.c 项目: 7799/linux
/*
 * Callback for completed capture URB.
 */
static void audio_in_callback(struct urb *urb)
{
	int i, index, length = 0, shutdown = 0;
	unsigned long flags;

	struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;

	line6pcm->last_frame_in = urb->start_frame;

	/* find index of URB */
	for (index = 0; index < LINE6_ISO_BUFFERS; ++index)
		if (urb == line6pcm->urb_audio_in[index])
			break;

	spin_lock_irqsave(&line6pcm->lock_audio_in, flags);

	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
		char *fbuf;
		int fsize;
		struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i];

		if (fin->status == -EXDEV) {
			shutdown = 1;
			break;
		}

		fbuf = urb->transfer_buffer + fin->offset;
		fsize = fin->actual_length;

		if (fsize > line6pcm->max_packet_size) {
			dev_err(line6pcm->line6->ifcdev,
				"driver and/or device bug: packet too large (%d > %d)\n",
				fsize, line6pcm->max_packet_size);
		}

		length += fsize;

		/* the following assumes LINE6_ISO_PACKETS == 1: */
		line6pcm->prev_fbuf = fbuf;
		line6pcm->prev_fsize = fsize;

#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
		if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
#endif
			if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
				     &line6pcm->flags) && (fsize > 0))
				line6_capture_copy(line6pcm, fbuf, fsize);
	}

	clear_bit(index, &line6pcm->active_urb_in);

	if (test_and_clear_bit(index, &line6pcm->unlink_urb_in))
		shutdown = 1;

	spin_unlock_irqrestore(&line6pcm->lock_audio_in, flags);

	if (!shutdown) {
		submit_audio_in_urb(line6pcm);

#ifdef CONFIG_LINE6_USB_IMPULSE_RESPONSE
		if (!(line6pcm->flags & LINE6_BITS_PCM_IMPULSE))
#endif
			if (test_bit(LINE6_INDEX_PCM_ALSA_CAPTURE_STREAM,
				     &line6pcm->flags))
				line6_capture_check_period(line6pcm, length);
	}
}