19506af788
Add a field to the AVBufferSinkParams for a list of accepted channel counts. Change the default value for the lists in AVBufferSinkParams to NULL, to let lavfi fill them with something useful. The fail_enomem path is unneeded because filters are uninited on failure.
150 lines
5.0 KiB
C
150 lines
5.0 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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* 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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* Struct to use for initializing a buffersink context.
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*/
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typedef struct {
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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 {
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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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} 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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* 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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* Get an audio/video buffer data from buffer_sink and put it in bufref.
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*
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* This function works with both audio and video buffer sinks.
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*
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* @param buffer_sink pointer to a buffersink or abuffersink context
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* @param flags a combination of AV_BUFFERSINK_FLAG_* flags
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* @return >= 0 in case of success, a negative AVERROR code in case of
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* failure
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*/
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int av_buffersink_get_buffer_ref(AVFilterContext *buffer_sink,
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AVFilterBufferRef **bufref, int flags);
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/**
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* Get the number of immediately available frames.
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*/
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int av_buffersink_poll_frame(AVFilterContext *ctx);
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/**
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* Get the frame rate of the input.
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*/
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AVRational av_buffersink_get_frame_rate(AVFilterContext *ctx);
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/**
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* @defgroup libav_api Libav API
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* @{
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*/
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/**
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* Get a buffer with filtered data from sink and put it in buf.
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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 buf pointer to the buffer will be written here if buf is non-NULL. buf
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* must be freed by the caller using avfilter_unref_buffer().
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* Buf may also be NULL to query whether a buffer is ready to be
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* output.
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*
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* @return >= 0 in case of success, a negative AVERROR code in case of
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* failure.
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*/
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int av_buffersink_read(AVFilterContext *ctx, AVFilterBufferRef **buf);
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/**
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* Same as av_buffersink_read, but with the ability to specify the number of
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* samples read. This function is less efficient than av_buffersink_read(),
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* 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 buf pointer to the buffer will be written here if buf is non-NULL. buf
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* must be freed by the caller using avfilter_unref_buffer(). buf
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* will contain exactly nb_samples audio samples, except at the end
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* of stream, when it can contain less than nb_samples.
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* Buf may also be NULL to query whether a buffer is ready to be
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* output.
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*
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* @warning do not mix this function with av_buffersink_read(). 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_read_samples(AVFilterContext *ctx, AVFilterBufferRef **buf,
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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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