[PATCH v2 4/6] winealsa: Move stop to the unixlib.

[Andrew Eikum]

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

On Wed, Mar 02, 2022 at 10:53:18AM +0000, Huw Davies wrote:
> Signed-off-by: Huw Davies <huw at codeweavers.com>
> ---
>  dlls/winealsa.drv/alsa.c     | 60 ++++++++++++++++++++++++++++++++++++
>  dlls/winealsa.drv/mmdevdrv.c | 51 +++---------------------------
>  dlls/winealsa.drv/unixlib.h  |  7 +++++
>  3 files changed, 71 insertions(+), 47 deletions(-)
> 
> diff --git a/dlls/winealsa.drv/alsa.c b/dlls/winealsa.drv/alsa.c
> index a5558718f47..e5efb6b201b 100644
> --- a/dlls/winealsa.drv/alsa.c
> +++ b/dlls/winealsa.drv/alsa.c
> @@ -1409,6 +1409,47 @@ exit:
>          NtSetEvent(stream->event, NULL);
>  }
>  
> +static snd_pcm_uframes_t interp_elapsed_frames(struct alsa_stream *stream)
> +{
> +    LARGE_INTEGER time_freq, current_time, time_diff;
> +
> +    NtQueryPerformanceCounter(&current_time, &time_freq);
> +    time_diff.QuadPart = current_time.QuadPart - stream->last_period_time.QuadPart;
> +    return muldiv(time_diff.QuadPart, stream->fmt->nSamplesPerSec, time_freq.QuadPart);
> +}
> +
> +static int alsa_rewind_best_effort(struct alsa_stream *stream)
> +{
> +    snd_pcm_uframes_t len, leave;
> +
> +    /* we can't use snd_pcm_rewindable, some PCM devices crash. so follow
> +     * PulseAudio's example and rewind as much data as we believe is in the
> +     * buffer, minus 1.33ms for safety. */
> +
> +    /* amount of data to leave in ALSA buffer */
> +    leave = interp_elapsed_frames(stream) + stream->safe_rewind_frames;
> +
> +    if(stream->held_frames < leave)
> +        stream->held_frames = 0;
> +    else
> +        stream->held_frames -= leave;
> +
> +    if(stream->data_in_alsa_frames < leave)
> +        len = 0;
> +    else
> +        len = stream->data_in_alsa_frames - leave;
> +
> +    TRACE("rewinding %lu frames, now held %u\n", len, stream->held_frames);
> +
> +    if(len)
> +        /* snd_pcm_rewind return value is often broken, assume it succeeded */
> +        snd_pcm_rewind(stream->pcm_handle, len);
> +
> +    stream->data_in_alsa_frames = 0;
> +
> +    return len;
> +}
> +
>  static NTSTATUS start(void *args)
>  {
>      struct start_params *params = args;
> @@ -1455,6 +1496,24 @@ static NTSTATUS start(void *args)
>      return alsa_unlock_result(stream, &params->result, S_OK);
>  }
>  
> +static NTSTATUS stop(void *args)
> +{
> +    struct stop_params *params = args;
> +    struct alsa_stream *stream = params->stream;
> +
> +    alsa_lock(stream);
> +
> +    if(!stream->started)
> +        return alsa_unlock_result(stream, &params->result, S_FALSE);
> +
> +    if(stream->flow == eRender)
> +        alsa_rewind_best_effort(stream);
> +
> +    stream->started = FALSE;
> +
> +    return alsa_unlock_result(stream, &params->result, S_OK);
> +}
> +
>  static NTSTATUS timer_loop(void *args)
>  {
>      struct timer_loop_params *params = args;
> @@ -1801,6 +1860,7 @@ unixlib_entry_t __wine_unix_call_funcs[] =
>      create_stream,
>      release_stream,
>      start,
> +    stop,
>      timer_loop,
>      is_format_supported,
>      get_mix_format,
> diff --git a/dlls/winealsa.drv/mmdevdrv.c b/dlls/winealsa.drv/mmdevdrv.c
> index 5eab548e606..d9e96b7790c 100644
> --- a/dlls/winealsa.drv/mmdevdrv.c
> +++ b/dlls/winealsa.drv/mmdevdrv.c
> @@ -972,39 +972,6 @@ static snd_pcm_uframes_t interp_elapsed_frames(struct alsa_stream *stream)
>      return MulDiv(time_diff.QuadPart, stream->fmt->nSamplesPerSec, time_freq.QuadPart);
>  }
>  
> -static int alsa_rewind_best_effort(ACImpl *This)
> -{
> -    struct alsa_stream *stream = This->stream;
> -    snd_pcm_uframes_t len, leave;
> -
> -    /* we can't use snd_pcm_rewindable, some PCM devices crash. so follow
> -     * PulseAudio's example and rewind as much data as we believe is in the
> -     * buffer, minus 1.33ms for safety. */
> -
> -    /* amount of data to leave in ALSA buffer */
> -    leave = interp_elapsed_frames(stream) + stream->safe_rewind_frames;
> -
> -    if(stream->held_frames < leave)
> -        stream->held_frames = 0;
> -    else
> -        stream->held_frames -= leave;
> -
> -    if(stream->data_in_alsa_frames < leave)
> -        len = 0;
> -    else
> -        len = stream->data_in_alsa_frames - leave;
> -
> -    TRACE("rewinding %lu frames, now held %u\n", len, stream->held_frames);
> -
> -    if(len)
> -        /* snd_pcm_rewind return value is often broken, assume it succeeded */
> -        snd_pcm_rewind(stream->pcm_handle, len);
> -
> -    stream->data_in_alsa_frames = 0;
> -
> -    return len;
> -}
> -
>  static HRESULT WINAPI AudioClient_Start(IAudioClient3 *iface)
>  {
>      ACImpl *This = impl_from_IAudioClient3(iface);
> @@ -1036,28 +1003,18 @@ static HRESULT WINAPI AudioClient_Start(IAudioClient3 *iface)
>  static HRESULT WINAPI AudioClient_Stop(IAudioClient3 *iface)
>  {
>      ACImpl *This = impl_from_IAudioClient3(iface);
> -    struct alsa_stream *stream = This->stream;
> +    struct stop_params params;
>  
>      TRACE("(%p)\n", This);
>  
>      if(!This->stream)
>          return AUDCLNT_E_NOT_INITIALIZED;
>  
> -    alsa_lock(stream);
> -
> -    if(!stream->started){
> -        alsa_unlock(stream);
> -        return S_FALSE;
> -    }
> -
> -    if(stream->flow == eRender)
> -        alsa_rewind_best_effort(This);
> -
> -    stream->started = FALSE;
> +    params.stream = This->stream;
>  
> -    alsa_unlock(stream);
> +    ALSA_CALL(stop, &params);
>  
> -    return S_OK;
> +    return params.result;
>  }
>  
>  static HRESULT WINAPI AudioClient_Reset(IAudioClient3 *iface)
> diff --git a/dlls/winealsa.drv/unixlib.h b/dlls/winealsa.drv/unixlib.h
> index c058a920b6e..1c3caabcc26 100644
> --- a/dlls/winealsa.drv/unixlib.h
> +++ b/dlls/winealsa.drv/unixlib.h
> @@ -97,6 +97,12 @@ struct start_params
>      HRESULT result;
>  };
>  
> +struct stop_params
> +{
> +    struct alsa_stream *stream;
> +    HRESULT result;
> +};
> +
>  struct timer_loop_params
>  {
>      struct alsa_stream *stream;
> @@ -147,6 +153,7 @@ enum alsa_funcs
>      alsa_create_stream,
>      alsa_release_stream,
>      alsa_start,
> +    alsa_stop,
>      alsa_timer_loop,
>      alsa_is_format_supported,
>      alsa_get_mix_format,
> -- 
> 2.25.1
> 
>