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wasapi2: Implement default audio channel mask

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Some capture devices might not provide channel mask value which will
result in capturing failure because of unknown channel mask in case
that device generates more than 2 channels. Although it might not
be correct, we can assume channel mask with the given number of channels.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2177>
This commit is contained in:
Seungha Yang 2021-04-20 18:37:15 +09:00 committed by GStreamer Marge Bot
parent f0ac468fb4
commit 33078bf54a
1 changed files with 44 additions and 7 deletions
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51
sys/wasapi2/gstwasapi2client.cpp
View file

@ -984,17 +984,36 @@ static struct
{SPEAKER_TOP_BACK_RIGHT, GST_AUDIO_CHANNEL_POSITION_TOP_REAR_RIGHT}
};
static DWORD default_ch_masks[] = {
0,
KSAUDIO_SPEAKER_MONO,
/* 2ch */
KSAUDIO_SPEAKER_STEREO,
/* 2.1ch */
/* KSAUDIO_SPEAKER_3POINT0 ? */
KSAUDIO_SPEAKER_2POINT1,
/* 4ch */
/* KSAUDIO_SPEAKER_3POINT1 or KSAUDIO_SPEAKER_SURROUND ? */
KSAUDIO_SPEAKER_QUAD,
/* 5ch */
KSAUDIO_SPEAKER_5POINT0,
/* 5.1ch */
KSAUDIO_SPEAKER_5POINT1,
/* 7ch */
KSAUDIO_SPEAKER_7POINT0,
/* 7.1ch */
KSAUDIO_SPEAKER_7POINT1,
};
/* Parse WAVEFORMATEX to get the gstreamer channel mask, and the wasapi channel
* positions so GstAudioRingbuffer can reorder the audio data to match the
* gstreamer channel order. */
static guint64
gst_wasapi_util_waveformatex_to_channel_mask (WAVEFORMATEXTENSIBLE * format,
GstAudioChannelPosition ** out_position)
gst_wasapi2_util_waveformatex_to_channel_mask (WORD nChannels,
DWORD dwChannelMask, GstAudioChannelPosition ** out_position)
{
int ii, ch;
guint64 mask = 0;
WORD nChannels = format->Format.nChannels;
DWORD dwChannelMask = format->dwChannelMask;
GstAudioChannelPosition *pos = NULL;
pos = g_new (GstAudioChannelPosition, nChannels);
@ -1041,7 +1060,9 @@ gst_wasapi2_util_parse_waveformatex (WAVEFORMATEXTENSIBLE * format,
GstAudioChannelPosition ** out_positions)
{
const gchar *afmt;
guint64 channel_mask;
guint64 channel_mask = 0;
DWORD dwChannelMask = 0;
WORD nChannels;
*out_caps = NULL;
@ -1064,9 +1085,25 @@ gst_wasapi2_util_parse_waveformatex (WAVEFORMATEXTENSIBLE * format,
*out_caps = gst_caps_copy (template_caps);
/* This will always return something that might be usable */
nChannels = format->Format.nChannels;
if (format->Format.wFormatTag == WAVE_FORMAT_EXTENSIBLE) {
dwChannelMask = format->dwChannelMask;
}
if (nChannels > 2 && !dwChannelMask) {
GST_WARNING ("Unknown channel mask value for %d channel stream",
format->Format.nChannels);
if (nChannels >= G_N_ELEMENTS (default_ch_masks)) {
GST_ERROR ("To may channels %d", nChannels);
return FALSE;
}
dwChannelMask = default_ch_masks[nChannels];
}
channel_mask =
gst_wasapi_util_waveformatex_to_channel_mask (format, out_positions);
gst_wasapi2_util_waveformatex_to_channel_mask (nChannels,
dwChannelMask, out_positions);
gst_caps_set_simple (*out_caps,
"format", G_TYPE_STRING, afmt,