DSP Utilities
[DSP Context]

DSP Utilities. More...

Functions

GAVL_PUBLIC int gavl_dsp_interpolate_video_frame (gavl_dsp_context_t *ctx, gavl_video_format_t *format, gavl_video_frame_t *src_1, gavl_video_frame_t *src_2, gavl_video_frame_t *dst, float factor)
 Do a linear interpolation of a video frame.
GAVL_PUBLIC int gavl_dsp_audio_frame_swap_endian (gavl_dsp_context_t *ctx, gavl_audio_frame_t *frame, const gavl_audio_format_t *format)
 Swap endianess an audio frame.
GAVL_PUBLIC int gavl_dsp_video_frame_swap_endian (gavl_dsp_context_t *ctx, gavl_video_frame_t *frame, const gavl_video_format_t *format)
 Swap endianess a video frame.
void gavl_dsp_video_frame_shift_bits (gavl_dsp_context_t *ctx, gavl_video_frame_t *frame, const gavl_video_format_t *format, int bits)
 Shift bits in a video frame.

Detailed Description

DSP Utilities.

These are some utility functions, which use a DSP context but operate on higher level structures like video frames. As usual, these are supported for any format.


Function Documentation

GAVL_PUBLIC int gavl_dsp_interpolate_video_frame ( gavl_dsp_context_t ctx,
gavl_video_format_t format,
gavl_video_frame_t src_1,
gavl_video_frame_t src_2,
gavl_video_frame_t dst,
float  factor 
)

Do a linear interpolation of a video frame.

Parameters:
ctx A DSP context
format Video format
src_1 Frame 1
src_2 Frame 2
dst Destination frame
factor Interpolation factor
Returns:
1 on success, 0 if an error occurred
If factor is 1.0, dst will be equal to src1, if factor is 0.0, dst will be equal to src2.

If the quality is at least GAVL_QUALITY_MIN, this function never fails.

GAVL_PUBLIC int gavl_dsp_audio_frame_swap_endian ( gavl_dsp_context_t ctx,
gavl_audio_frame_t frame,
const gavl_audio_format_t format 
)

Swap endianess an audio frame.

Parameters:
ctx An initialized dsp context
frame An audio frame
format The format of the frame
Returns:
1 on success, 0 if an error occurred
If the quality is at least GAVL_QUALITY_MIN, this function never fails.

GAVL_PUBLIC int gavl_dsp_video_frame_swap_endian ( gavl_dsp_context_t ctx,
gavl_video_frame_t frame,
const gavl_video_format_t format 
)

Swap endianess a video frame.

Parameters:
ctx An initialized dsp context
frame A video frame
format The format of the frame
Returns:
1 on success, 0 if an error occurred
This function swaps endianess for pixelformats, which have multibyte numbers as components. For 32 bit long formats with 8 bit components, it swaps the pixels as if they were 32 bit integers. For all other formats, it does nothing.

If the quality is at least GAVL_QUALITY_MIN, this function never fails.

void gavl_dsp_video_frame_shift_bits ( gavl_dsp_context_t ctx,
gavl_video_frame_t frame,
const gavl_video_format_t format,
int  bits 
)

Shift bits in a video frame.

Parameters:
ctx An initialized dsp context
frame A video frame
format The format of the frame
bits Number of bits to shift each component
This shifts the bits of all components. It works only for 16 bit formats right now. If bits is larger than zero, the components are shifted left (resulting in larger numbers). If bits is smaller than zero, the components are shifted right (resulting in smaller numbers).

Since 1.5.0


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