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C++ snd_compr_get_avail函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中snd_compr_get_avail函数的典型用法代码示例。如果您正苦于以下问题：C++ snd_compr_get_avail函数的具体用法？C++ snd_compr_get_avail怎么用？C++ snd_compr_get_avail使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了snd_compr_get_avail函数的7个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: snd_compr_poll

static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
{
	struct snd_compr_file *data = f->private_data;
	struct snd_compr_stream *stream;
	size_t avail;
	int retval = 0;

	if (snd_BUG_ON(!data))
		return -EFAULT;
	stream = &data->stream;
	if (snd_BUG_ON(!stream))
		return -EFAULT;

	mutex_lock(&stream->device->lock);
	if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
			stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
		retval = -EBADFD;
		goto out;
	}
	poll_wait(f, &stream->runtime->sleep, wait);

	avail = snd_compr_get_avail(stream);
	pr_debug("avail is %ld\n", (unsigned long)avail);
	/* check if we have at least one fragment to fill */
	switch (stream->runtime->state) {
	case SNDRV_PCM_STATE_DRAINING:
		/* stream has been woken up after drain is complete
		 * draining done so set stream state to stopped
		 */
		retval = snd_compr_get_poll(stream);
		stream->runtime->state = SNDRV_PCM_STATE_SETUP;
		break;
	case SNDRV_PCM_STATE_RUNNING:
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_PAUSED:
		if (avail >= stream->runtime->fragment_size)
			retval = snd_compr_get_poll(stream);
		break;
	default:
		if (stream->direction == SND_COMPRESS_PLAYBACK)
			retval = POLLOUT | POLLWRNORM | POLLERR;
		else
			retval = POLLIN | POLLRDNORM | POLLERR;
		break;
	}
out:
	mutex_unlock(&stream->device->lock);
	return retval;
}
开发者ID:marcelotorres1982，项目名称:kernel-msm，代码行数:49，代码来源:compress_offload.c


示例2: snd_compr_read

static ssize_t snd_compr_read(struct file *f, char __user *buf,
		size_t count, loff_t *offset)
{
	struct snd_compr_file *data = f->private_data;
	struct snd_compr_stream *stream;
	size_t avail;
	int retval;

	if (snd_BUG_ON(!data))
		return -EFAULT;

	stream = &data->stream;
	mutex_lock(&stream->device->lock);

	/* read is allowed when stream is running, paused, draining and setup
	 * (yes setup is state which we transition to after stop, so if user
	 * wants to read data after stop we allow that)
	 */
	switch (stream->runtime->state) {
	case SNDRV_PCM_STATE_OPEN:
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_SUSPENDED:
	case SNDRV_PCM_STATE_DISCONNECTED:
		retval = -EBADFD;
		goto out;
	case SNDRV_PCM_STATE_XRUN:
		retval = -EPIPE;
		goto out;
	}

	avail = snd_compr_get_avail(stream);
	pr_debug("avail returned %ld\n", (unsigned long)avail);
	/* calculate how much we can read from buffer */
	if (avail > count)
		avail = count;

	if (stream->ops->copy) {
		retval = stream->ops->copy(stream, buf, avail);
	} else {
		retval = -ENXIO;
		goto out;
	}
	if (retval > 0)
		stream->runtime->total_bytes_transferred += retval;

out:
	mutex_unlock(&stream->device->lock);
	return retval;
}
开发者ID:ReneNyffenegger，项目名称:linux，代码行数:49，代码来源:compress_offload.c


示例3: snd_compr_write

static ssize_t snd_compr_write(struct file *f, const char __user *buf,
		size_t count, loff_t *offset)
{
	struct snd_compr_file *data = f->private_data;
	struct snd_compr_stream *stream;
	size_t avail;
	int retval;

	if (snd_BUG_ON(!data))
		return -EFAULT;

	stream = &data->stream;
	mutex_lock(&stream->device->lock);
	/* write is allowed when stream is running or has been steup */
	switch (stream->runtime->state) {
	case SNDRV_PCM_STATE_SETUP:
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_RUNNING:
		break;
	default:
		mutex_unlock(&stream->device->lock);
		return -EBADFD;
	}

	avail = snd_compr_get_avail(stream);
	pr_debug("avail returned %ld\n", (unsigned long)avail);
	/* calculate how much we can write to buffer */
	if (avail > count)
		avail = count;

	if (stream->ops->copy) {
		char __user* cbuf = (char __user*)buf;
		retval = stream->ops->copy(stream, cbuf, avail);
	} else {
		retval = snd_compr_write_data(stream, buf, avail);
	}
	if (retval > 0)
		stream->runtime->total_bytes_available += retval;

	/* while initiating the stream, write should be called before START
	 * call, so in setup move state */
	if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
		stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
		pr_debug("stream prepared, Houston we are good to go\n");
	}

	mutex_unlock(&stream->device->lock);
	return retval;
}
开发者ID:ReneNyffenegger，项目名称:linux，代码行数:49，代码来源:compress_offload.c


示例4: snd_compr_poll

static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
{
	struct snd_compr_file *data = f->private_data;
	struct snd_compr_stream *stream;
	size_t avail;
	int retval = 0;

	if (snd_BUG_ON(!data))
		return -EFAULT;
	stream = &data->stream;
	if (snd_BUG_ON(!stream))
		return -EFAULT;

	mutex_lock(&stream->device->lock);
	if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
			stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
		retval = -EBADFD;
		goto out;
	}
	poll_wait(f, &stream->runtime->sleep, wait);

	avail = snd_compr_get_avail(stream);
	pr_debug("avail is %zu\n", avail);
	
	switch (stream->runtime->state) {
	case SNDRV_PCM_STATE_DRAINING:
		retval = snd_compr_get_poll(stream);
		stream->runtime->state = SNDRV_PCM_STATE_SETUP;
		break;
	case SNDRV_PCM_STATE_RUNNING:
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_PAUSED:
		if (avail >= stream->runtime->fragment_size)
			retval = snd_compr_get_poll(stream);
		break;
	default:
		if (stream->direction == SND_COMPRESS_PLAYBACK)
			retval = POLLOUT | POLLWRNORM | POLLERR;
		else
			retval = POLLIN | POLLRDNORM | POLLERR;
		break;
	}
out:
	mutex_unlock(&stream->device->lock);
	return retval;
}
开发者ID:Clumsy-Kernel-Development，项目名称:M9_Kernel，代码行数:46，代码来源:compress_offload.c


示例5: snd_compr_write

static ssize_t snd_compr_write(struct file *f, const char __user *buf,
		size_t count, loff_t *offset)
{
	struct snd_compr_file *data = f->private_data;
	struct snd_compr_stream *stream;
	size_t avail;
	int retval;

	if (snd_BUG_ON(!data))
		return -EFAULT;

	stream = &data->stream;
	mutex_lock(&stream->device->lock);
	
	if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
			stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
		mutex_unlock(&stream->device->lock);
		return -EBADFD;
	}

	avail = snd_compr_get_avail(stream);
	pr_debug("avail returned %zu\n", avail);
	/* calculate how much we can write to buffer */
	if (avail > count)
		avail = count;

	if (stream->ops->copy) {
		char __user* cbuf = (char __user*)buf;
		retval = stream->ops->copy(stream, cbuf, avail);
	} else {
		retval = snd_compr_write_data(stream, buf, avail);
	}
	if (retval > 0)
		stream->runtime->total_bytes_available += retval;

	if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
		stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
		pr_debug("stream prepared, Houston we are good to go\n");
	}

	mutex_unlock(&stream->device->lock);
	return retval;
}
开发者ID:jiugui1，项目名称:kernel-mm-m8，代码行数:43，代码来源:compress_offload.c


示例6: snd_compr_read

static ssize_t snd_compr_read(struct file *f, char __user *buf,
		size_t count, loff_t *offset)
{
	struct snd_compr_file *data = f->private_data;
	struct snd_compr_stream *stream;
	size_t avail;
	int retval;

	if (snd_BUG_ON(!data))
		return -EFAULT;

	stream = &data->stream;
	mutex_lock(&stream->device->lock);

	switch (stream->runtime->state) {
	case SNDRV_PCM_STATE_OPEN:
	case SNDRV_PCM_STATE_PREPARED:
	case SNDRV_PCM_STATE_XRUN:
	case SNDRV_PCM_STATE_SUSPENDED:
	case SNDRV_PCM_STATE_DISCONNECTED:
		retval = -EBADFD;
		goto out;
	}

	avail = snd_compr_get_avail(stream);
	pr_debug("avail returned %zu\n", avail);
	
	if (avail > count)
		avail = count;

	if (stream->ops->copy) {
		retval = stream->ops->copy(stream, buf, avail);
	} else {
		retval = -ENXIO;
		goto out;
	}
	if (retval > 0)
		stream->runtime->total_bytes_transferred += retval;

out:
	mutex_unlock(&stream->device->lock);
	return retval;
}
开发者ID:Clumsy-Kernel-Development，项目名称:M9_Kernel，代码行数:43，代码来源:compress_offload.c


示例7: snd_compr_read

static ssize_t snd_compr_read(struct file *f, char __user *buf,
		size_t count, loff_t *offset)
{
	struct snd_compr_file *data = f->private_data;
	struct snd_compr_stream *stream;
	size_t avail;
	int retval;

	if (snd_BUG_ON(!data))
		return -EFAULT;

	stream = &data->stream;
	mutex_lock(&stream->device->lock);

	/* read is allowed when stream is running */
	if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
		retval = -EBADFD;
		goto out;
	}

	avail = snd_compr_get_avail(stream);
	pr_debug("avail returned %ld\n", (unsigned long)avail);
	/* calculate how much we can read from buffer */
	if (avail > count)
		avail = count;

	if (stream->ops->copy) {
		retval = stream->ops->copy(stream, buf, avail);
	} else {
		retval = -ENXIO;
		goto out;
	}
	if (retval > 0)
		stream->runtime->total_bytes_transferred += retval;

out:
	mutex_unlock(&stream->device->lock);
	return retval;
}
开发者ID:boa19861105，项目名称:BOA_Butterfly2_L5.1_kernel，代码行数:39，代码来源:compress_offload.c



注：本文中的snd_compr_get_avail函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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