[PATCH 2/3] winealsa: Move get_latency to the unixlib.

[Andrew Eikum]

Signed-off-by: Andrew Eikum <aeikum at codeweavers.com>

On Wed, Feb 23, 2022 at 09:08:22AM +0000, Huw Davies wrote:
> Signed-off-by: Huw Davies <huw at codeweavers.com>
> ---
>  dlls/winealsa.drv/alsa.c     | 22 ++++++++++++++++++++++
>  dlls/winealsa.drv/mmdevdrv.c | 20 +++++---------------
>  dlls/winealsa.drv/unixlib.h  |  8 ++++++++
>  3 files changed, 35 insertions(+), 15 deletions(-)
> 
> diff --git a/dlls/winealsa.drv/alsa.c b/dlls/winealsa.drv/alsa.c
> index cc0f9166d1a..c40c87bca31 100644
> --- a/dlls/winealsa.drv/alsa.c
> +++ b/dlls/winealsa.drv/alsa.c
> @@ -1250,6 +1250,27 @@ static NTSTATUS get_buffer_size(void *args)
>      return alsa_unlock_result(stream, &params->result, S_OK);
>  }
>  
> +static NTSTATUS get_latency(void *args)
> +{
> +    struct get_latency_params *params = args;
> +    struct alsa_stream *stream = params->stream;
> +
> +    alsa_lock(stream);
> +
> +    /* Hide some frames in the ALSA buffer. Allows us to return GetCurrentPadding=0
> +     * yet have enough data left to play (as if it were in native's mixer). Add:
> +     * + mmdevapi_period such that at the end of it, ALSA still has data;
> +     * + EXTRA_SAFE (~4ms) to allow for late callback invocation / fluctuation;
> +     * + alsa_period such that ALSA always has at least one period to play. */
> +    if(stream->flow == eRender)
> +        *params->latency = muldiv(stream->hidden_frames, 10000000, stream->fmt->nSamplesPerSec);
> +    else
> +        *params->latency = muldiv(stream->alsa_period_frames, 10000000, stream->fmt->nSamplesPerSec)
> +            + stream->mmdev_period_rt;
> +
> +    return alsa_unlock_result(stream, &params->result, S_OK);
> +}
> +
>  unixlib_entry_t __wine_unix_call_funcs[] =
>  {
>      get_endpoint_ids,
> @@ -1258,4 +1279,5 @@ unixlib_entry_t __wine_unix_call_funcs[] =
>      is_format_supported,
>      get_mix_format,
>      get_buffer_size,
> +    get_latency,
>  };
> diff --git a/dlls/winealsa.drv/mmdevdrv.c b/dlls/winealsa.drv/mmdevdrv.c
> index 46fd2b3aef5..b8fc6802e28 100644
> --- a/dlls/winealsa.drv/mmdevdrv.c
> +++ b/dlls/winealsa.drv/mmdevdrv.c
> @@ -849,7 +849,7 @@ static HRESULT WINAPI AudioClient_GetStreamLatency(IAudioClient3 *iface,
>          REFERENCE_TIME *latency)
>  {
>      ACImpl *This = impl_from_IAudioClient3(iface);
> -    struct alsa_stream *stream = This->stream;
> +    struct get_latency_params params;
>  
>      TRACE("(%p)->(%p)\n", This, latency);
>  
> @@ -859,22 +859,12 @@ static HRESULT WINAPI AudioClient_GetStreamLatency(IAudioClient3 *iface,
>      if(!This->stream)
>          return AUDCLNT_E_NOT_INITIALIZED;
>  
> -    alsa_lock(stream);
> -
> -    /* Hide some frames in the ALSA buffer. Allows us to return GetCurrentPadding=0
> -     * yet have enough data left to play (as if it were in native's mixer). Add:
> -     * + mmdevapi_period such that at the end of it, ALSA still has data;
> -     * + EXTRA_SAFE (~4ms) to allow for late callback invocation / fluctuation;
> -     * + alsa_period such that ALSA always has at least one period to play. */
> -    if(stream->flow == eRender)
> -        *latency = MulDiv(stream->hidden_frames, 10000000, stream->fmt->nSamplesPerSec);
> -    else
> -        *latency = MulDiv(stream->alsa_period_frames, 10000000, stream->fmt->nSamplesPerSec)
> -                 + stream->mmdev_period_rt;
> +    params.stream = This->stream;
> +    params.latency = latency;
>  
> -    alsa_unlock(stream);
> +    ALSA_CALL(get_latency, &params);
>  
> -    return S_OK;
> +    return params.result;
>  }
>  
>  static HRESULT WINAPI AudioClient_GetCurrentPadding(IAudioClient3 *iface,
> diff --git a/dlls/winealsa.drv/unixlib.h b/dlls/winealsa.drv/unixlib.h
> index e079b88cbde..e51d3d3d510 100644
> --- a/dlls/winealsa.drv/unixlib.h
> +++ b/dlls/winealsa.drv/unixlib.h
> @@ -115,6 +115,13 @@ struct get_buffer_size_params
>      UINT32 *size;
>  };
>  
> +struct get_latency_params
> +{
> +    struct alsa_stream *stream;
> +    HRESULT result;
> +    REFERENCE_TIME *latency;
> +};
> +
>  enum alsa_funcs
>  {
>      alsa_get_endpoint_ids,
> @@ -123,6 +130,7 @@ enum alsa_funcs
>      alsa_is_format_supported,
>      alsa_get_mix_format,
>      alsa_get_buffer_size,
> +    alsa_get_latency,
>  };
>  
>  extern unixlib_handle_t alsa_handle;
> -- 
> 2.25.1
> 
>