mirror of
https://github.com/FFmpeg/FFmpeg.git
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166 lines
6.2 KiB
C
166 lines
6.2 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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/**
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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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* Struct to use for initializing a buffersink context.
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*/
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typedef struct AVBufferSinkParams {
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const enum AVPixelFormat *pixel_fmts; ///< list of allowed pixel formats, terminated by AV_PIX_FMT_NONE
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} AVBufferSinkParams;
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/**
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* Create an AVBufferSinkParams structure.
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*
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* Must be freed with av_free().
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*/
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AVBufferSinkParams *av_buffersink_params_alloc(void);
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/**
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* Struct to use for initializing an abuffersink context.
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*/
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typedef struct AVABufferSinkParams {
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const enum AVSampleFormat *sample_fmts; ///< list of allowed sample formats, terminated by AV_SAMPLE_FMT_NONE
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const int64_t *channel_layouts; ///< list of allowed channel layouts, terminated by -1
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const int *channel_counts; ///< list of allowed channel counts, terminated by -1
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int all_channel_counts; ///< if not 0, accept any channel count or layout
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int *sample_rates; ///< list of allowed sample rates, terminated by -1
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} AVABufferSinkParams;
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/**
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* Create an AVABufferSinkParams structure.
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*
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* Must be freed with av_free().
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*/
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AVABufferSinkParams *av_abuffersink_params_alloc(void);
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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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int av_buffersink_get_channels (const AVFilterContext *ctx);
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uint64_t av_buffersink_get_channel_layout (const AVFilterContext *ctx);
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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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