Re: [Qemu-devel] [PATCH] [For stable-0.12] Sync OSS_GETVERSION handling with head

[Anthony Liguori <anthony@codemonkey.ws>]

On 01/17/2010 11:23 AM, Juergen Lock wrote:
> As suggested by Andreas Färber, here is a cumulative patch that syncs
> OSS_GETVERSION handling with head by merging the following commits:
>
> 1. oss: issue OSS_GETVERSION ioctl only when needed
>     6d246526ce3c145b2831285def6983f5de6190d3
>
> 2. oss: fix fragment setting
>     3d709fe73a77c40e263b3af6e650fd4b519c3562
>
> 3. Workaround for broken OSS_GETVERSION on FreeBSD, part two
>     72ff25e4e98d6dba9286d032b9ff5432553bbad5
>
> Signed-off-by: Juergen Lock<nox@jelal.kn-bremen.de>
>    

malc, please Ack.

Regards,

Anthony Liguori

> --- a/audio/ossaudio.c
> +++ b/audio/ossaudio.c
> @@ -38,6 +38,10 @@
>   #define AUDIO_CAP "oss"
>   #include "audio_int.h"
>
> +#if defined OSS_GETVERSION&&  defined SNDCTL_DSP_POLICY
> +#define USE_DSP_POLICY
> +#endif
> +
>   typedef struct OSSVoiceOut {
>       HWVoiceOut hw;
>       void *pcm_buf;
> @@ -236,14 +240,39 @@ static void oss_dump_info (struct oss_pa
>   }
>   #endif
>
> +#ifdef USE_DSP_POLICY
> +static int oss_get_version (int fd, int *version, const char *typ)
> +{
> +    if (ioctl (fd, OSS_GETVERSION,&version)) {
> +#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
> +        /*
> +         * Looks like atm (20100109) FreeBSD knows OSS_GETVERSION
> +         * since 7.x, but currently only on the mixer device (or in
> +         * the Linuxolator), and in the native version that part of
> +         * the code is in fact never reached so the ioctl fails anyway.
> +         * Until this is fixed, just check the errno and if its what
> +         * FreeBSD's sound drivers return atm assume they are new enough.
> +         */
> +        if (errno == EINVAL) {
> +            *version = 0x040000;
> +            return 0;
> +        }
> +#endif
> +        oss_logerr2 (errno, typ, "Failed to get OSS version\n");
> +        return -1;
> +    }
> +    return 0;
> +}
> +#endif
> +
>   static int oss_open (int in, struct oss_params *req,
>                        struct oss_params *obt, int *pfd)
>   {
>       int fd;
> -    int version;
>       int oflags = conf.exclusive ? O_EXCL : 0;
>       audio_buf_info abinfo;
>       int fmt, freq, nchannels;
> +    int setfragment = 1;
>       const char *dspname = in ? conf.devpath_in : conf.devpath_out;
>       const char *typ = in ? "ADC" : "DAC";
>
> @@ -281,27 +310,30 @@ static int oss_open (int in, struct oss_
>           goto err;
>       }
>
> -    if (ioctl (fd, OSS_GETVERSION,&version)) {
> -        oss_logerr2 (errno, typ, "Failed to get OSS version\n");
> -        version = 0;
> -    }
> +#ifdef USE_DSP_POLICY
> +    if (conf.policy>= 0) {
> +        int version;
>
> -    if (conf.debug) {
> -        dolog ("OSS version = %#x\n", version);
> -    }
> +        if (!oss_get_version (fd,&version, typ)) {
> +            if (conf.debug) {
> +                dolog ("OSS version = %#x\n", version);
> +            }
>
> -#ifdef SNDCTL_DSP_POLICY
> -    if (conf.policy>= 0&&  version>= 0x040000) {
> -        int policy = conf.policy;
> -        if (ioctl (fd, SNDCTL_DSP_POLICY,&policy)) {
> -            oss_logerr2 (errno, typ, "Failed to set timing policy to %d\n",
> -                         conf.policy);
> -            goto err;
> +            if (version>= 0x040000) {
> +                int policy = conf.policy;
> +                if (ioctl (fd, SNDCTL_DSP_POLICY,&policy)) {
> +                    oss_logerr2 (errno, typ,
> +                                 "Failed to set timing policy to %d\n",
> +                                 conf.policy);
> +                    goto err;
> +                }
> +                setfragment = 0;
> +            }
>           }
>       }
> -    else
>   #endif
> -    {
> +
> +    if (setfragment) {
>           int mmmmssss = (req->nfrags<<  16) | ctz32 (req->fragsize);
>           if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT,&mmmmssss)) {
>               oss_logerr2 (errno, typ, "Failed to set buffer length (%d, %d)\n",
> @@ -857,7 +889,7 @@ static struct audio_option oss_options[]
>           .valp  =&conf.exclusive,
>           .descr = "Open device in exclusive mode (vmix wont work)"
>       },
> -#ifdef SNDCTL_DSP_POLICY
> +#ifdef USE_DSP_POLICY
>       {
>           .name  = "POLICY",
>           .tag   = AUD_OPT_INT,
>
>
>
>