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Ensure WaveOut compatibility with Win9X/NT (#687)

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jjceresa 2020-10-14 17:54:56 +02:00 committed by GitHub
parent f14cbb8782
commit 5b8f3cbbc2
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1 changed files with 17 additions and 5 deletions
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14
src/drivers/fluid_waveout.c
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@ -287,6 +287,7 @@ new_fluid_waveout_audio_driver(fluid_settings_t *settings, fluid_synth_t *synth)
sample_size = sizeof(float);
write_ptr = fluid_synth_write_float_channels;
wfx.SubFormat = guid_float;
wfx.Format.wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
}
else if(fluid_settings_str_equal(settings, "audio.sample-format", "16bits"))
{
@ -296,6 +297,7 @@ new_fluid_waveout_audio_driver(fluid_settings_t *settings, fluid_synth_t *synth)
sample_size = sizeof(short);
write_ptr = fluid_synth_write_s16_channels;
wfx.SubFormat = guid_pcm;
wfx.Format.wFormatTag = WAVE_FORMAT_PCM;
}
else
{
@ -320,11 +322,21 @@ new_fluid_waveout_audio_driver(fluid_settings_t *settings, fluid_synth_t *synth)
wfx.Format.nBlockAlign = sample_size * wfx.Format.nChannels;
wfx.Format.nSamplesPerSec = frequency;
wfx.Format.nAvgBytesPerSec = frequency * wfx.Format.nBlockAlign;
/* extension */
/* WAVEFORMATEXTENSIBLE extension is used only when channels number
is above 2.
When channels number is below 2, only WAVEFORMATEX structure
will be used by the Windows driver. This ensures compatibility with
Windows 9X/NT in the case these versions does not accept the
WAVEFORMATEXTENSIBLE structure.
*/
if(wfx.Format.nChannels > 2)
{
wfx.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
wfx.Format.cbSize = 22;
wfx.Samples.wValidBitsPerSample = wfx.Format.wBitsPerSample;
wfx.dwChannelMask = channel_mask_speakers[synth->audio_channels - 1];
}
/* Calculate the length of a single buffer */
lenBuffer = (MS_BUFFER_LENGTH * wfx.Format.nAvgBytesPerSec + 999) / 1000;