[alsa-devel] [TINYCOMPRESS][PATCH 1/1] compress: Add support for capture streams

[Vinod Koul]

On Fri, Apr 26, 2013 at 04:14:22PM +0100, Richard Fitzgerald wrote:
> 
> Signed-off-by: Charles Keepax <ckeepax at opensource.wolfsonmicro.com>
> Signed-off-by: Richard Fitzgerald <rf at opensource.wolfsonmicro.com>
> ---
>  compress.c                          |   64 +++++++++++++++++++++++++++++++---
>  include/tinycompress/tinycompress.h |    2 +-
>  2 files changed, 59 insertions(+), 7 deletions(-)
Applied thanks, now where is crecord :-)

--
~Vinod
> 
> diff --git a/compress.c b/compress.c
> index 86cca88..e80e598 100644
> --- a/compress.c
> +++ b/compress.c
> @@ -240,13 +240,12 @@ struct compress *compress_open(unsigned int card, unsigned int device,
>  		oops(&bad_compress, -EINVAL, "can't deduce device direction from given flags");
>  		goto config_fail;
>  	}
> +
>  	if (flags & COMPRESS_OUT) {
> -		/* this should be removed once we have capture tested */
> -		oops(&bad_compress, -EINVAL, "this version doesnt support capture");
> -		goto config_fail;
> +		compress->fd = open(fn, O_RDONLY);
> +	} else {
> +		compress->fd = open(fn, O_WRONLY);
>  	}
> -
> -	compress->fd = open(fn, O_WRONLY);
>  	if (compress->fd < 0) {
>  		oops(&bad_compress, errno, "cannot open device '%s'", fn);
>  		goto config_fail;
> @@ -403,7 +402,60 @@ int compress_write(struct compress *compress, const void *buf, unsigned int size
>  
>  int compress_read(struct compress *compress, void *buf, unsigned int size)
>  {
> -	return oops(compress, -ENOTTY, "Not supported yet in lib");
> +	struct snd_compr_avail avail;
> +	struct pollfd fds;
> +	int to_read = 0;
> +	int num_read, total = 0, ret;
> +	char* cbuf = buf;
> +	const unsigned int frag_size = compress->config->fragment_size;
> +
> +	if (!(compress->flags & COMPRESS_OUT))
> +		return oops(compress, -EINVAL, "Invalid flag set");
> +	if (!is_compress_ready(compress))
> +		return oops(compress, -ENODEV, "device not ready");
> +	fds.fd = compress->fd;
> +	fds.events = POLLIN;
> +
> +	while (size) {
> +		if (ioctl(compress->fd, SNDRV_COMPRESS_AVAIL, &avail))
> +			return oops(compress, errno, "cannot get avail");
> +
> +		if ( (avail.avail < frag_size) && (avail.avail < size) ) {
> +			/* Less than one fragment available and not at the
> +			 * end of the read, so poll
> +			 */
> +			ret = poll(&fds, 1, compress->max_poll_wait_ms);
> +			/* A pause will cause -EBADFD or zero.
> +			 * This is not an error, just stop reading */
> +			if ((ret == 0) || (ret == -EBADFD))
> +				break;
> +			if (ret < 0)
> +				return oops(compress, errno, "poll error");
> +			if (fds.revents & POLLIN) {
> +				continue;
> +			}
> +			if (fds.revents & POLLERR) {
> +				return oops(compress, -EIO, "poll returned error!");
> +			}
> +		}
> +		/* read avail bytes */
> +		if (size > avail.avail)
> +			to_read = avail.avail;
> +		else
> +			to_read = size;
> +		num_read = read(compress->fd, cbuf, to_read);
> +		/* If play was paused the read returns -EBADFD */
> +		if (num_read == -EBADFD)
> +			break;
> +		if (num_read < 0)
> +			return oops(compress, errno, "read failed!");
> +
> +		size -= num_read;
> +		cbuf += num_read;
> +		total += num_read;
> +	}
> +
> +	return total;
>  }
>  
>  int compress_start(struct compress *compress)
> diff --git a/include/tinycompress/tinycompress.h b/include/tinycompress/tinycompress.h
> index ba9f3b6..9867afc 100644
> --- a/include/tinycompress/tinycompress.h
> +++ b/include/tinycompress/tinycompress.h
> @@ -76,7 +76,7 @@ struct compr_gapless_mdata {
>  	__u32 encoder_padding;
>  };
>  
> -#define COMPRESS_OUT        0x00000000
> +#define COMPRESS_OUT        0x20000000
>  #define COMPRESS_IN         0x10000000
>  
>  struct compress;
> -- 
> 1.7.2.5
> 
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