directx.c

video linux conference

    }

    waveformat.Format.nChannels = i_nb_channels;
    waveformat.Format.nSamplesPerSec = i_rate;
    waveformat.Format.nBlockAlign =
        waveformat.Format.wBitsPerSample / 8 * i_nb_channels;
    waveformat.Format.nAvgBytesPerSec =
        waveformat.Format.nSamplesPerSec * waveformat.Format.nBlockAlign;

    p_aout->output.p_sys->i_bits_per_sample = waveformat.Format.wBitsPerSample;
    p_aout->output.p_sys->i_channels = i_nb_channels;

    /* Then fill in the direct sound descriptor */
    memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
    dsbdesc.dwSize = sizeof(DSBUFFERDESC);
    dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
                    | DSBCAPS_CTRLPOSITIONNOTIFY     /* We need notification */
                    | DSBCAPS_GLOBALFOCUS;      /* Allows background playing */

    /* Only use the new WAVE_FORMAT_EXTENSIBLE format for multichannel audio */
    if( i_nb_channels <= 2 )
    {
        waveformat.Format.cbSize = 0;
    }
    else
    {
        waveformat.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
        waveformat.Format.cbSize =
            sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);

        /* Needed for 5.1 on emu101k */
        dsbdesc.dwFlags |= DSBCAPS_LOCHARDWARE;
    }

    dsbdesc.dwBufferBytes = FRAMES_NUM * i_bytes_per_frame;   /* buffer size */
    dsbdesc.lpwfxFormat = (WAVEFORMATEX *)&waveformat;

    if FAILED( IDirectSound_CreateSoundBuffer(
                   p_aout->output.p_sys->p_dsobject, &dsbdesc,
                   &p_aout->output.p_sys->p_dsbuffer, NULL) )
    {
        if( dsbdesc.dwFlags & DSBCAPS_LOCHARDWARE )
        {
            /* Try without DSBCAPS_LOCHARDWARE */
            dsbdesc.dwFlags &= ~DSBCAPS_LOCHARDWARE;
            if FAILED( IDirectSound_CreateSoundBuffer(
                   p_aout->output.p_sys->p_dsobject, &dsbdesc,
                   &p_aout->output.p_sys->p_dsbuffer, NULL) )
            {
                return VLC_EGENERIC;
            }
            if( !b_probe )
                msg_Dbg( p_aout, "couldn't use hardware sound buffer" );
        }
        else
        {
            return VLC_EGENERIC;
        }
    }

    /* Stop here if we were just probing */
    if( b_probe )
    {
        IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
        p_aout->output.p_sys->p_dsbuffer = NULL;
        return VLC_SUCCESS;
    }

    /* Backup the size of a frame */
    p_aout->output.p_sys->p_notif->i_frame_size = i_bytes_per_frame;

    /* Now the secondary buffer is created, we need to setup its position
     * notification */
    for( i = 0; i < FRAMES_NUM; i++ )
    {
        p_aout->output.p_sys->p_notif->p_events[i].dwOffset = i *
            p_aout->output.p_sys->p_notif->i_frame_size;

        p_aout->output.p_sys->p_notif->i_frame_status[i] = FRAME_EMPTY;
    }

    /* Get the IDirectSoundNotify interface */
    if FAILED( IDirectSoundBuffer_QueryInterface(
                                p_aout->output.p_sys->p_dsbuffer,
                                &IID_IDirectSoundNotify,
                                (LPVOID *)&p_aout->output.p_sys->p_dsnotify ) )
    {
        msg_Err( p_aout, "cannot get IDirectSoundNotify interface" );
        goto error;
    }

    if FAILED( IDirectSoundNotify_SetNotificationPositions(
                                    p_aout->output.p_sys->p_dsnotify,
                                    FRAMES_NUM,
                                    p_aout->output.p_sys->p_notif->p_events ) )
    {
        msg_Err( p_aout, "cannot set position notification" );
        goto error;
    }

    p_aout->output.p_sys->i_channel_mask = waveformat.dwChannelMask;

    p_aout->output.p_sys->b_chan_reorder =
        aout_CheckChannelReorder( pi_channels_in, pi_channels_out,
                                  waveformat.dwChannelMask, i_nb_channels,
                                  p_aout->output.p_sys->pi_chan_table );

    if( p_aout->output.p_sys->b_chan_reorder )
    {
        msg_Dbg( p_aout, "channel reordering needed" );
    }

    return VLC_SUCCESS;

 error:
    DestroyDSBuffer( p_aout );
    return VLC_EGENERIC;
}

/*****************************************************************************
 * CreateDSBufferPCM: creates a PCM direct sound buffer.
 *****************************************************************************
 * We first try to create a WAVE_FORMAT_IEEE_FLOAT buffer if supported by
 * the hardware, otherwise we create a WAVE_FORMAT_PCM buffer.
 ****************************************************************************/
static int CreateDSBufferPCM( aout_instance_t *p_aout, int *i_format,
                              int i_channels, int i_nb_channels, int i_rate,
                              vlc_bool_t b_probe )
{
    vlc_value_t val;

    var_Get( p_aout, "directx-audio-float32", &val );

    /* Float32 audio samples are not supported for 5.1 output on the emu101k */

    if( !val.b_bool || i_nb_channels > 2 ||
        CreateDSBuffer( p_aout, VLC_FOURCC('f','l','3','2'),
                        i_channels, i_nb_channels, i_rate,
                        FRAME_SIZE * 4 * i_nb_channels, b_probe )
        != VLC_SUCCESS )
    {
        if ( CreateDSBuffer( p_aout, VLC_FOURCC('s','1','6','l'),
                             i_channels, i_nb_channels, i_rate,
                             FRAME_SIZE * 2 * i_nb_channels, b_probe )
             != VLC_SUCCESS )
        {
            return VLC_EGENERIC;
        }
        else
        {
            *i_format = VLC_FOURCC('s','1','6','l');
            return VLC_SUCCESS;
        }
    }
    else
    {
        *i_format = VLC_FOURCC('f','l','3','2');
        return VLC_SUCCESS;
    }
}

/*****************************************************************************
 * DestroyDSBuffer
 *****************************************************************************
 * This function destroys the secondary buffer.
 *****************************************************************************/
static void DestroyDSBuffer( aout_instance_t *p_aout )
{
    if( p_aout->output.p_sys->p_dsnotify )
    {
        IDirectSoundNotify_Release( p_aout->output.p_sys->p_dsnotify );
        p_aout->output.p_sys->p_dsnotify = NULL;
    }

    if( p_aout->output.p_sys->p_dsbuffer )
    {
        IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
        p_aout->output.p_sys->p_dsbuffer = NULL;
    }
}

/*****************************************************************************
 * FillBuffer: Fill in one of the direct sound frame buffers.
 *****************************************************************************
 * Returns VLC_SUCCESS on success.
 *****************************************************************************/
static int FillBuffer( aout_instance_t *p_aout, int i_frame,
                       aout_buffer_t *p_buffer )
{
    notification_thread_t *p_notif = p_aout->output.p_sys->p_notif;
    aout_sys_t *p_sys = p_aout->output.p_sys;
    void *p_write_position, *p_wrap_around;
    long l_bytes1, l_bytes2;
    HRESULT dsresult;

    /* Before copying anything, we have to lock the buffer */
    dsresult = IDirectSoundBuffer_Lock(
                p_sys->p_dsbuffer,                              /* DS buffer */
                i_frame * p_notif->i_frame_size,             /* Start offset */
                p_notif->i_frame_size,                    /* Number of bytes */
                &p_write_position,                  /* Address of lock start */
                &l_bytes1,       /* Count of bytes locked before wrap around */
                &p_wrap_around,            /* Buffer adress (if wrap around) */
                &l_bytes2,               /* Count of bytes after wrap around */
                0 );                                                /* Flags */
    if( dsresult == DSERR_BUFFERLOST )
    {
        IDirectSoundBuffer_Restore( p_sys->p_dsbuffer );
        dsresult = IDirectSoundBuffer_Lock(
                               p_sys->p_dsbuffer,
                               i_frame * p_notif->i_frame_size,
                               p_notif->i_frame_size,
                               &p_write_position,
                               &l_bytes1,
                               &p_wrap_around,
                               &l_bytes2,
                               0 );
    }
    if( dsresult != DS_OK )
    {
        msg_Warn( p_notif, "cannot lock buffer" );
        if( p_buffer ) aout_BufferFree( p_buffer );
        return VLC_EGENERIC;
    }

    if( p_buffer == NULL )
    {
        memset( p_write_position, 0, l_bytes1 );
    }
    else
    {
        if( p_sys->b_chan_reorder )
        {
            /* Do the channel reordering here */
            aout_ChannelReorder( p_buffer->p_buffer, p_buffer->i_nb_bytes,
                                 p_sys->i_channels, p_sys->pi_chan_table,
                                 p_sys->i_bits_per_sample );
        }

        p_aout->p_vlc->pf_memcpy( p_write_position, p_buffer->p_buffer,
                                  l_bytes1 );
        aout_BufferFree( p_buffer );
    }

    /* Now the data has been copied, unlock the buffer */
    IDirectSoundBuffer_Unlock( p_sys->p_dsbuffer, p_write_position, l_bytes1,
                               p_wrap_around, l_bytes2 );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * DirectSoundThread: this thread will capture play notification events. 
 *****************************************************************************
 * We use this thread to emulate a callback mechanism. The thread probes for
 * event notification and fills up the DS secondary buffer when needed.
 *****************************************************************************/
static void DirectSoundThread( notification_thread_t *p_notif )
{
    HANDLE  notification_events[FRAMES_NUM];
    HRESULT dsresult;
    aout_instance_t *p_aout = p_notif->p_aout;
    int i, i_which_frame, i_last_frame, i_next_frame;
    mtime_t mtime;
    vlc_bool_t b_sleek;

    for( i = 0; i < FRAMES_NUM; i++ )
        notification_events[i] = p_notif->p_events[i].hEventNotify;

    /* We don't want any resampling when using S/PDIF output */
    b_sleek = p_aout->output.output.i_format == VLC_FOURCC('s','p','d','i');

    /* Tell the main thread that we are ready */
    vlc_thread_ready( p_notif );

    msg_Dbg( p_notif, "DirectSoundThread ready" );

    /* Wait here until Play() is called */
    WaitForSingleObject( notification_events[0], INFINITE );

    if( !p_notif->b_die )
    {
        mwait( p_notif->start_date - AOUT_PTS_TOLERANCE / 2 );

        /* start playing the buffer */
        dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
                                        0,                         /* Unused */
                                        0,                         /* Unused */
                                        DSBPLAY_LOOPING );          /* Flags */
        if( dsresult == DSERR_BUFFERLOST )
        {
            IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
            dsresult = IDirectSoundBuffer_Play(
                                            p_aout->output.p_sys->p_dsbuffer,
                                            0,                     /* Unused */
                                            0,                     /* Unused */
                                            DSBPLAY_LOOPING );      /* Flags */
        }
        if( dsresult != DS_OK )
        {
            msg_Err( p_aout, "cannot start playing buffer" );
        }
    }

    while( !p_notif->b_die )
    {
        aout_buffer_t *p_buffer;
        long l_latency;

        /* wait for the position notification */
        i_which_frame = WaitForMultipleObjects( FRAMES_NUM,
                                                notification_events, 0,
                                                INFINITE ) - WAIT_OBJECT_0;

        if( p_notif->b_die )
            break;

        mtime = mdate();

        /* We take into account the current latency */
        if SUCCEEDED( IDirectSoundBuffer_GetCurrentPosition(
                        p_aout->output.p_sys->p_dsbuffer,
                        &l_latency, NULL ) )
        {
            if( l_latency > (i_which_frame * FRAME_SIZE)
                  && l_latency < ((i_which_frame+1) * FRAME_SIZE) )
            {
                l_latency = - ( l_latency /
                                p_aout->output.output.i_bytes_per_frame %
                                FRAME_SIZE );
            }
            else
            {
                l_latency = FRAME_SIZE - ( l_latency /
                                      p_aout->output.output.i_bytes_per_frame %
                                      FRAME_SIZE );
            }
        }
        else
        {
            l_latency = 0;
        }

        /* Mark last frame as empty */
        i_last_frame = (i_which_frame + FRAMES_NUM -1) % FRAMES_NUM;
        i_next_frame = (i_which_frame + 1) % FRAMES_NUM;
        p_notif->i_frame_status[i_last_frame] = FRAME_EMPTY;

        /* Try to fill in as many frame buffers as possible */
        for( i = i_next_frame; (i % FRAMES_NUM) != i_which_frame; i++ )
        {

            /* Check if frame buf is already filled */
            if( p_notif->i_frame_status[i % FRAMES_NUM] == FRAME_QUEUED )
                continue;

            p_buffer = aout_OutputNextBuffer( p_aout,
                mtime + 1000000 / p_aout->output.output.i_rate *
                ((i - i_next_frame + 1) * FRAME_SIZE + l_latency), b_sleek );

            /* If there is no audio data available and we have some buffered
             * already, then just wait for the next time */
            if( !p_buffer && (i != i_next_frame) )
            {
                //msg_Err( p_aout, "only %i frame buffers filled!",
                //         i - i_next_frame );
                break;
            }

            if( FillBuffer( p_aout, (i%FRAMES_NUM), p_buffer )
                != VLC_SUCCESS )
                break;

            /* Mark the frame buffer as QUEUED */
            p_notif->i_frame_status[i%FRAMES_NUM] = FRAME_QUEUED;
        }

    }

    /* make sure the buffer isn't playing */
    IDirectSoundBuffer_Stop( p_aout->output.p_sys->p_dsbuffer );

    /* free the events */
    for( i = 0; i < FRAMES_NUM; i++ )
        CloseHandle( notification_events[i] );

    msg_Dbg( p_notif, "DirectSoundThread exiting" );
}