From 49bb6402f1aa1effa9d9c5df39d91a86ca8fd736 Mon Sep 17 00:00:00 2001 From: Charles Keepax Date: Thu, 18 Apr 2013 11:02:08 +0100 Subject: ALSA: compress_core: Add support for capture streams Signed-off-by: Charles Keepax Signed-off-by: Richard Fitzgerald Acked-by: Vinod Koul Signed-off-by: Takashi Iwai --- sound/core/compress_offload.c | 43 +++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 41 insertions(+), 2 deletions(-) diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c index 52ca4cce1462..52a276510b18 100644 --- a/sound/core/compress_offload.c +++ b/sound/core/compress_offload.c @@ -296,7 +296,41 @@ static ssize_t snd_compr_write(struct file *f, const char __user *buf, static ssize_t snd_compr_read(struct file *f, char __user *buf, size_t count, loff_t *offset) { - return -ENXIO; + 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; } static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma) @@ -481,9 +515,14 @@ snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg) retval = stream->ops->set_params(stream, params); if (retval) goto out; - stream->runtime->state = SNDRV_PCM_STATE_SETUP; + stream->metadata_set = false; stream->next_track = false; + + if (stream->direction == SND_COMPRESS_PLAYBACK) + stream->runtime->state = SNDRV_PCM_STATE_SETUP; + else + stream->runtime->state = SNDRV_PCM_STATE_PREPARED; } else { return -EPERM; } -- cgit v1.2.3