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GstAudioDownmixMeta * gst_buffer_add_audio_downmix_meta (GstBuffer *buffer
,const GstAudioChannelPosition *from_position
,gint from_channels
,const GstAudioChannelPosition *to_position
,gint to_channels
,const gfloat **matrix
);
Attaches GstAudioDownmixMeta metadata to buffer
with the given parameters.
matrix
is an two-dimensional array of to_channels
times from_channels
coefficients, i.e. the i-th output channels is constructed by multiplicating
the input channels with the coefficients in matrix
[i] and taking the sum
of the results.
buffer |
||
from_position |
the channel positions of the source. |
[array length=from_channels] |
from_channels |
The number of channels of the source |
|
to_position |
the channel positions of the destination. |
[array length=to_channels] |
to_channels |
The number of channels of the destination |
|
matrix |
The matrix coefficients. |
#define gst_buffer_get_audio_downmix_meta(b) ((GstAudioDownmixMeta*)gst_buffer_get_meta((b),GST_AUDIO_DOWNMIX_META_INFO))
GstAudioDownmixMeta * gst_buffer_get_audio_downmix_meta_for_channels (GstBuffer *buffer
,const GstAudioChannelPosition *to_position
,gint to_channels
);
Find the GstAudioDownmixMeta on buffer
for the given destination
channel positions.
struct GstAudioDownmixMeta { GstMeta meta; GstAudioChannelPosition *from_position; GstAudioChannelPosition *to_position; gint from_channels, to_channels; gfloat **matrix; };
Extra buffer metadata describing audio downmixing matrix. This metadata is
attached to audio buffers and contains a matrix to downmix the buffer number
of channels to channels
.
matrix
is an two-dimensional array of to_channels
times from_channels
coefficients, i.e. the i-th output channels is constructed by multiplicating
the input channels with the coefficients in matrix
[i] and taking the sum
of the results.
GstMeta |
parent GstMeta |
|
GstAudioChannelPosition * |
the channel positions of the source |
|
GstAudioChannelPosition * |
the channel positions of the destination |
|
gint |
the number of channels of the source |
|
gint |
the number of channels of the destination |
|
gfloat ** |
the matrix coefficients. |