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1efcdbc54d
"int-list" options are a hack that provides rudimentary support for array-type options by treating them as byte arrays (i.e. AV_OPT_TYPE_BINARY). Since we now have proper array-type options, they should replace "int-list" everywhere (which happens to be just buffersink).
167 lines
6.5 KiB
C
167 lines
6.5 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFILTER_BUFFERSINK_H
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#define AVFILTER_BUFFERSINK_H
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/**
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* @file
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* @ingroup lavfi_buffersink
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* memory buffer sink API for audio and video
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*/
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#include "avfilter.h"
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/**
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* @defgroup lavfi_buffersink Buffer sink API
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* @ingroup lavfi
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* @{
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*
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* The buffersink and abuffersink filters are there to connect filter graphs
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* to applications. They have a single input, connected to the graph, and no
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* output. Frames must be extracted using av_buffersink_get_frame() or
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* av_buffersink_get_samples().
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*
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* The format negotiated by the graph during configuration can be obtained
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* using the accessor functions:
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* - av_buffersink_get_time_base(),
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* - av_buffersink_get_format(),
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* - av_buffersink_get_frame_rate(),
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* - av_buffersink_get_w(),
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* - av_buffersink_get_h(),
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* - av_buffersink_get_sample_aspect_ratio(),
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* - av_buffersink_get_channels(),
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* - av_buffersink_get_ch_layout(),
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* - av_buffersink_get_sample_rate().
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*
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* The layout returned by av_buffersink_get_ch_layout() must de uninitialized
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* by the caller.
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*
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* The format can be constrained by setting options, using av_opt_set() and
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* related functions with the AV_OPT_SEARCH_CHILDREN flag.
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* - pixel_formats (array of pixel formats),
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* - colorspaces (array of int),
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* - colorranges (array of int),
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* - sample_formats (array of sample formats),
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* - samplerates (array of int),
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* - channel_layouts (array of channel layouts)
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* If an option is not set, all corresponding formats are accepted.
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*/
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/**
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* Get a frame with filtered data from sink and put it in frame.
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*
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* @param ctx pointer to a buffersink or abuffersink filter context.
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* @param frame pointer to an allocated frame that will be filled with data.
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* The data must be freed using av_frame_unref() / av_frame_free()
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* @param flags a combination of AV_BUFFERSINK_FLAG_* flags
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*
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* @return >= 0 in for success, a negative AVERROR code for failure.
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*/
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int av_buffersink_get_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags);
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/**
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* Tell av_buffersink_get_buffer_ref() to read video/samples buffer
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* reference, but not remove it from the buffer. This is useful if you
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* need only to read a video/samples buffer, without to fetch it.
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*/
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#define AV_BUFFERSINK_FLAG_PEEK 1
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/**
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* Tell av_buffersink_get_buffer_ref() not to request a frame from its input.
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* If a frame is already buffered, it is read (and removed from the buffer),
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* but if no frame is present, return AVERROR(EAGAIN).
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*/
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#define AV_BUFFERSINK_FLAG_NO_REQUEST 2
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/**
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* Set the frame size for an audio buffer sink.
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*
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* All calls to av_buffersink_get_buffer_ref will return a buffer with
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* exactly the specified number of samples, or AVERROR(EAGAIN) if there is
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* not enough. The last buffer at EOF will be padded with 0.
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*/
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void av_buffersink_set_frame_size(AVFilterContext *ctx, unsigned frame_size);
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/**
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* @defgroup lavfi_buffersink_accessors Buffer sink accessors
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* Get the properties of the stream
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* @{
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*/
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enum AVMediaType av_buffersink_get_type (const AVFilterContext *ctx);
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AVRational av_buffersink_get_time_base (const AVFilterContext *ctx);
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int av_buffersink_get_format (const AVFilterContext *ctx);
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AVRational av_buffersink_get_frame_rate (const AVFilterContext *ctx);
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int av_buffersink_get_w (const AVFilterContext *ctx);
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int av_buffersink_get_h (const AVFilterContext *ctx);
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AVRational av_buffersink_get_sample_aspect_ratio (const AVFilterContext *ctx);
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enum AVColorSpace av_buffersink_get_colorspace (const AVFilterContext *ctx);
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enum AVColorRange av_buffersink_get_color_range (const AVFilterContext *ctx);
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int av_buffersink_get_channels (const AVFilterContext *ctx);
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int av_buffersink_get_ch_layout (const AVFilterContext *ctx,
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AVChannelLayout *ch_layout);
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int av_buffersink_get_sample_rate (const AVFilterContext *ctx);
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AVBufferRef * av_buffersink_get_hw_frames_ctx (const AVFilterContext *ctx);
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/** @} */
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/**
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* Get a frame with filtered data from sink and put it in frame.
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*
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* @param ctx pointer to a context of a buffersink or abuffersink AVFilter.
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* @param frame pointer to an allocated frame that will be filled with data.
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* The data must be freed using av_frame_unref() / av_frame_free()
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*
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* @return
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* - >= 0 if a frame was successfully returned.
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* - AVERROR(EAGAIN) if no frames are available at this point; more
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* input frames must be added to the filtergraph to get more output.
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* - AVERROR_EOF if there will be no more output frames on this sink.
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* - A different negative AVERROR code in other failure cases.
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*/
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int av_buffersink_get_frame(AVFilterContext *ctx, AVFrame *frame);
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/**
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* Same as av_buffersink_get_frame(), but with the ability to specify the number
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* of samples read. This function is less efficient than
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* av_buffersink_get_frame(), because it copies the data around.
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*
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* @param ctx pointer to a context of the abuffersink AVFilter.
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* @param frame pointer to an allocated frame that will be filled with data.
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* The data must be freed using av_frame_unref() / av_frame_free()
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* frame will contain exactly nb_samples audio samples, except at
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* the end of stream, when it can contain less than nb_samples.
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*
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* @return The return codes have the same meaning as for
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* av_buffersink_get_frame().
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*
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* @warning do not mix this function with av_buffersink_get_frame(). Use only one or
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* the other with a single sink, not both.
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*/
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int av_buffersink_get_samples(AVFilterContext *ctx, AVFrame *frame, int nb_samples);
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/**
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* @}
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*/
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#endif /* AVFILTER_BUFFERSINK_H */
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