463 lines
13 KiB
ReStructuredText
463 lines
13 KiB
ReStructuredText
Media I/O API Reference (libobs/media-io)
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=========================================
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.. code:: cpp
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#include <obs.h>
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Video Handler
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-------------
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.. type:: video_t
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Video output handler object
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---------------------
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.. type:: enum video_format
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Video format. Can be one of the following values:
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- VIDEO_FORMAT_I420
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- VIDEO_FORMAT_NV12
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- VIDEO_FORMAT_YVYU
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- VIDEO_FORMAT_YUY2
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- VIDEO_FORMAT_UYVY
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- VIDEO_FORMAT_RGBA
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- VIDEO_FORMAT_BGRA
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- VIDEO_FORMAT_BGRX
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- VIDEO_FORMAT_Y800
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- VIDEO_FORMAT_I444
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---------------------
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.. type:: enum video_colorspace
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YUV color space. Can be one of the following values:
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- VIDEO_CS_DEFAULT - Equivalent to VIDEO_CS_601
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- VIDEO_CS_601 - 601 color space
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- VIDEO_CS_709 - 709 color space
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---------------------
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.. type:: enum video_range_type
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YUV color range.
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- VIDEO_RANGE_DEFAULT - Equivalent to VIDEO_RANGE_PARTIAL
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- VIDEO_RANGE_PARTIAL - Partial range
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- VIDEO_RANGE_FULL - Full range
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---------------------
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.. type:: struct video_data
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Video frame structure.
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.. member:: uint8_t *video_data.data[MAX_AV_PLANES]
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.. member:: uint32_t video_data.linesize[MAX_AV_PLANES]
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.. member:: uint64_t video_data.timestamp
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---------------------
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.. type:: struct video_output_info
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Video output handler information
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.. member:: const char *video_output_info.name
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.. member:: enum video_format video_output_info.format
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.. member:: uint32_t video_output_info.fps_num
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.. member:: uint32_t video_output_info.fps_den
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.. member:: uint32_t video_output_info.width
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.. member:: uint32_t video_output_info.height
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.. member:: size_t video_output_info.cache_size
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.. member:: enum video_colorspace video_output_info.colorspace
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.. member:: enum video_range_type video_output_info.range
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---------------------
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.. function:: enum video_format video_format_from_fourcc(uint32_t fourcc)
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Converts a fourcc value to a video format.
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:param forcecc: Fourcc value
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:return: Video format
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---------------------
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.. function:: bool video_format_get_parameters(enum video_colorspace color_space, enum video_range_type range, float matrix[16], float min_range[3], float max_range[3])
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Converts a color space/range to matrix/min/max values.
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:param color_space: Color space to convert
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:param range: Color range to convert
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:param matrix: Pointer to the matrix
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:param min_range: Pointer to get the minimum range value
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:param max_range: Pointer to get the maximum range value
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---------------------
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.. function:: bool video_output_connect(video_t *video, const struct video_scale_info *conversion, void (*callback)(void *param, struct video_data *frame), void *param)
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Connects a raw video callback to the video output handler.
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:param video: Video output handler object
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:param callback: Callback to receive video data
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:param param: Private data to pass to the callback
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---------------------
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.. function:: void video_output_disconnect(video_t *video, void (*callback)(void *param, struct video_data *frame), void *param)
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Disconnects a raw video callback from the video output handler.
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:param video: Video output handler object
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:param callback: Callback
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:param param: Private data
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---------------------
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.. function:: const struct video_output_info *video_output_get_info(const video_t *video)
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Gets the full video information of the video output handler.
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:param video: Video output handler object
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:return: Video output info structure pointer
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---------------------
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.. function:: uint64_t video_output_get_frame_time(const video_t *video)
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Gets the frame interval of the video output handler.
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:param video: Video output handler object
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:return: Video frame interval in nanoseconds
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---------------------
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.. function:: enum video_format video_output_get_format(const video_t *video)
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Gets the video format of the video output handler.
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:param video: Video output handler object
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:return: Video format
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---------------------
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.. function:: uint32_t video_output_get_width(const video_t *video)
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.. function:: uint32_t video_output_get_height(const video_t *video)
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Gets the width/height of the video output handler.
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:param video: Video output handler object
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:return: Width/height
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---------------------
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.. function:: double video_output_get_frame_rate(const video_t *video)
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Gets the frame rate (as a floating point) of the video output
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handler.
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:param video: Video output handler object
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:return: Frame rate
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---------------------
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.. function:: uint32_t video_output_get_skipped_frames(const video_t *video)
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Gets the skipped frame count of the video output handler.
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:param video: Video output handler object
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:return: Skipped frame count
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---------------------
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.. function:: uint32_t video_output_get_total_frames(const video_t *video)
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Gets the total frames processed of the video output handler.
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:param video: Video output handler object
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:return: Total frames processed
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---------------------
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Audio Handler
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-------------
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.. type:: audio_t
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---------------------
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.. type:: enum audio_format
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Audio format. Can be one of the following values:
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- AUDIO_FORMAT_UNKNOWN
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- AUDIO_FORMAT_U8BIT
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- AUDIO_FORMAT_16BIT
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- AUDIO_FORMAT_32BIT
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- AUDIO_FORMAT_FLOAT
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- AUDIO_FORMAT_U8BIT_PLANAR
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- AUDIO_FORMAT_16BIT_PLANAR
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- AUDIO_FORMAT_32BIT_PLANAR
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- AUDIO_FORMAT_FLOAT_PLANAR
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---------------------
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.. type:: enum speaker_layout
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Speaker layout. Can be one of the following values:
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- SPEAKERS_UNKNOWN
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- SPEAKERS_MONO
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- SPEAKERS_STEREO
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- SPEAKERS_2POINT1
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- SPEAKERS_QUAD
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- SPEAKERS_4POINT1
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- SPEAKERS_5POINT1
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- SPEAKERS_5POINT1_SURROUND
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- SPEAKERS_7POINT1
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- SPEAKERS_7POINT1_SURROUND
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- SPEAKERS_SURROUND
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---------------------
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.. type:: struct audio_data
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Audio data structure.
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.. member:: uint8_t *audio_data.data[MAX_AV_PLANES]
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.. member:: uint32_t audio_data.frames
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.. member:: uint64_t audio_data.timestamp
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---------------------
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.. type:: struct audio_output_data
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.. member:: float *audio_output_data.data[MAX_AUDIO_CHANNELS]
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---------------------
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.. type:: struct audio_output_info
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.. member:: const char *audio_output_info.name
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.. member:: uint32_t audio_output_info.samples_per_sec
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.. member:: enum audio_format audio_output_info.format
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.. member:: enum speaker_layout audio_output_info.speakers
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.. member:: audio_input_callback_t audio_output_info.input_callback
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.. member:: void *audio_output_info.input_param
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---------------------
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.. type:: struct audio_convert_info
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.. member:: uint32_t audio_convert_info.samples_per_sec
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.. member:: enum audio_format audio_convert_info.format
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.. member:: enum speaker_layout audio_convert_info.speakers
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---------------------
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.. type:: typedef bool (*audio_input_callback_t)(void *param, uint64_t start_ts, uint64_t end_ts, uint64_t *new_ts, uint32_t active_mixers, struct audio_output_data *mixes)
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Audio input callback (typically used internally).
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---------------------
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.. function:: uint32_t get_audio_channels(enum speaker_layout speakers)
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Converts a speaker layout to its audio channel count.
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:param speakers: Speaker layout enumeration
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:return: Channel count
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---------------------
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.. function:: size_t get_audio_bytes_per_channel(enum audio_format format)
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Gets the audio bytes per channel for a specific audio format.
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:param format: Audio format
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:return: Bytes per channel
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---------------------
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.. function:: bool is_audio_planar(enum audio_format format)
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Returns whether the audio format is a planar format.
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:param format: Audio format
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:return: *true* if audio is planar, *false* otherwise
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---------------------
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.. function:: size_t get_audio_planes(enum audio_format format, enum speaker_layout speakers)
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Gets the number of audio planes for a specific audio format and
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speaker layout.
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:param format: Audio format
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:param speakers: Speaker layout
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:return: Number of audio planes
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---------------------
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.. function:: size_t get_audio_size(enum audio_format format, enum speaker_layout speakers, uint32_t frames)
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Gets the audio block size for a specific frame out with the given
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format and speaker layout.
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:param format: Audio format
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:param speakers: Speaker layout
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:param frames: Audio frame count
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:return: Audio block size
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---------------------
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.. function:: uint64_t audio_frames_to_ns(size_t sample_rate, uint64_t frames)
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Helper function to convert a specific number of audio frames to
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nanoseconds based upon its sample rate.
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:param sample_rate: Sample rate
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:param frames: Frame count
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:return: Nanoseconds
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---------------------
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.. function:: uint64_t ns_to_audio_frames(size_t sample_rate, uint64_t ns)
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Helper function to convert a specific number of nanoseconds to audio
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frame count based upon its sample rate.
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:param sample_rate: Sample rate
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:param ns: Nanoseconds
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:return: Frame count
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---------------------
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.. type:: typedef void (*audio_output_callback_t)(void *param, size_t mix_idx, struct audio_data *data)
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Audio output callback. Typically used internally.
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---------------------
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.. function:: bool audio_output_connect(audio_t *audio, size_t mix_idx, const struct audio_convert_info *conversion, audio_output_callback_t callback, void *param)
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Connects a raw audio callback to the audio output handler.
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Optionally allows audio conversion if necessary.
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:param audio: Audio output handler object
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:param mix_idx: Mix index to get raw audio from
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:param conversion: Audio conversion information, or *NULL* for no
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conversion
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:param callback: Raw audio callback
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:param param: Private data to pass to the callback
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---------------------
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.. function:: void audio_output_disconnect(audio_t *audio, size_t mix_idx, audio_output_callback_t callback, void *param)
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Disconnects a raw audio callback from the audio output handler.
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:param audio: Audio output handler object
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:param mix_idx: Mix index to get raw audio from
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:param callback: Raw audio callback
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:param param: Private data to pass to the callback
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---------------------
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.. function:: size_t audio_output_get_block_size(const audio_t *audio)
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Gets the audio block size of an audio output handler.
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:param audio: Audio output handler object
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:return: Audio block size
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---------------------
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.. function:: size_t audio_output_get_planes(const audio_t *audio)
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Gets the plane count of an audio output handler.
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:param audio: Audio output handler object
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:return: Audio plane count
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---------------------
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.. function:: size_t audio_output_get_channels(const audio_t *audio)
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Gets the channel count of an audio output handler.
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:param audio: Audio output handler object
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:return: Audio channel count
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---------------------
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.. function:: uint32_t audio_output_get_sample_rate(const audio_t *audio)
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Gets the sample rate of an audio output handler.
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:param audio: Audio output handler object
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:return: Audio sample rate
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---------------------
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.. function:: const struct audio_output_info *audio_output_get_info(const audio_t *audio)
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Gets all audio information for an audio output handler.
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:param audio: Audio output handler object
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:return: Pointer to audio output information structure
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---------------------
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Resampler
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---------
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FFmpeg wrapper to resample audio.
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.. type:: typedef struct audio_resampler audio_resampler_t
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---------------------
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.. type:: struct resample_info
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.. member:: uint32_t resample_info.samples_per_sec
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.. member:: enum audio_format resample_info.format
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.. member:: enum speaker_layout resample_info.speakers
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---------------------
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.. function:: audio_resampler_t *audio_resampler_create(const struct resample_info *dst, const struct resample_info *src)
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Creates an audio resampler.
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:param dst: Destination audio information
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:param src: Source audio information
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:return: Audio resampler object
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---------------------
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.. function:: void audio_resampler_destroy(audio_resampler_t *resampler)
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Destroys an audio resampler.
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:param resampler: Audio resampler object
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---------------------
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.. function:: bool audio_resampler_resample(audio_resampler_t *resampler, uint8_t *output[], uint32_t *out_frames, uint64_t *ts_offset, const uint8_t *const input[], uint32_t in_frames)
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Resamples audio frames.
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:param resampler: Audio resampler object
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:param output: Pointer to receive converted audio frames
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:param out_frames: Pointer to receive converted audio frame count
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:param ts_offset: Pointer to receive timestamp offset (in
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nanoseconds)
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:param const input: Input frames to convert
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:param in_frames: Input frame count
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