FFmpeg/libavfilter/formats.h

323 lines
12 KiB
C
Raw Normal View History

/*
* This file is part of FFmpeg.
*
Merge remote-tracking branch 'qatar/master' * qatar/master: (26 commits) fate: use diff -b in oneline comparison Add missing version bumps and APIchanges/Changelog entries. lavfi: move buffer management function to a separate file. lavfi: move formats-related functions from default.c to formats.c lavfi: move video-related functions to a separate file. fate: make smjpeg a demux test fate: separate sierra-vmd audio and video tests fate: separate smacker audio and video tests libmp3lame: set supported channel layouts. avconv: automatically insert asyncts when -async is used. avconv: add support for audio filters. lavfi: add asyncts filter. lavfi: add aformat filter lavfi: add an audio buffer sink. lavfi: add an audio buffer source. buffersrc: add av_buffersrc_write_frame(). buffersrc: fix invalid read in uninit if the fifo hasn't been allocated lavfi: rename vsrc_buffer.c to buffersrc.c avfiltergraph: reindent lavfi: add channel layout/sample rate negotiation. ... Conflicts: Changelog doc/APIchanges doc/filters.texi ffmpeg.c ffprobe.c libavcodec/libmp3lame.c libavfilter/Makefile libavfilter/af_aformat.c libavfilter/allfilters.c libavfilter/avfilter.c libavfilter/avfilter.h libavfilter/avfiltergraph.c libavfilter/buffersrc.c libavfilter/defaults.c libavfilter/formats.c libavfilter/src_buffer.c libavfilter/version.h libavfilter/vf_yadif.c libavfilter/vsrc_buffer.c libavfilter/vsrc_buffer.h libavutil/avutil.h tests/fate/audio.mak tests/fate/demux.mak tests/fate/video.mak Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-05-16 00:27:31 +00:00
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
Merge remote-tracking branch 'qatar/master' * qatar/master: (26 commits) fate: use diff -b in oneline comparison Add missing version bumps and APIchanges/Changelog entries. lavfi: move buffer management function to a separate file. lavfi: move formats-related functions from default.c to formats.c lavfi: move video-related functions to a separate file. fate: make smjpeg a demux test fate: separate sierra-vmd audio and video tests fate: separate smacker audio and video tests libmp3lame: set supported channel layouts. avconv: automatically insert asyncts when -async is used. avconv: add support for audio filters. lavfi: add asyncts filter. lavfi: add aformat filter lavfi: add an audio buffer sink. lavfi: add an audio buffer source. buffersrc: add av_buffersrc_write_frame(). buffersrc: fix invalid read in uninit if the fifo hasn't been allocated lavfi: rename vsrc_buffer.c to buffersrc.c avfiltergraph: reindent lavfi: add channel layout/sample rate negotiation. ... Conflicts: Changelog doc/APIchanges doc/filters.texi ffmpeg.c ffprobe.c libavcodec/libmp3lame.c libavfilter/Makefile libavfilter/af_aformat.c libavfilter/allfilters.c libavfilter/avfilter.c libavfilter/avfilter.h libavfilter/avfiltergraph.c libavfilter/buffersrc.c libavfilter/defaults.c libavfilter/formats.c libavfilter/src_buffer.c libavfilter/version.h libavfilter/vf_yadif.c libavfilter/vsrc_buffer.c libavfilter/vsrc_buffer.h libavutil/avutil.h tests/fate/audio.mak tests/fate/demux.mak tests/fate/video.mak Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-05-16 00:27:31 +00:00
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
Merge remote-tracking branch 'qatar/master' * qatar/master: (26 commits) fate: use diff -b in oneline comparison Add missing version bumps and APIchanges/Changelog entries. lavfi: move buffer management function to a separate file. lavfi: move formats-related functions from default.c to formats.c lavfi: move video-related functions to a separate file. fate: make smjpeg a demux test fate: separate sierra-vmd audio and video tests fate: separate smacker audio and video tests libmp3lame: set supported channel layouts. avconv: automatically insert asyncts when -async is used. avconv: add support for audio filters. lavfi: add asyncts filter. lavfi: add aformat filter lavfi: add an audio buffer sink. lavfi: add an audio buffer source. buffersrc: add av_buffersrc_write_frame(). buffersrc: fix invalid read in uninit if the fifo hasn't been allocated lavfi: rename vsrc_buffer.c to buffersrc.c avfiltergraph: reindent lavfi: add channel layout/sample rate negotiation. ... Conflicts: Changelog doc/APIchanges doc/filters.texi ffmpeg.c ffprobe.c libavcodec/libmp3lame.c libavfilter/Makefile libavfilter/af_aformat.c libavfilter/allfilters.c libavfilter/avfilter.c libavfilter/avfilter.h libavfilter/avfiltergraph.c libavfilter/buffersrc.c libavfilter/defaults.c libavfilter/formats.c libavfilter/src_buffer.c libavfilter/version.h libavfilter/vf_yadif.c libavfilter/vsrc_buffer.c libavfilter/vsrc_buffer.h libavutil/avutil.h tests/fate/audio.mak tests/fate/demux.mak tests/fate/video.mak Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-05-16 00:27:31 +00:00
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVFILTER_FORMATS_H
#define AVFILTER_FORMATS_H
#include "avfilter.h"
#include "version.h"
/**
* A list of supported formats for one end of a filter link. This is used
* during the format negotiation process to try to pick the best format to
* use to minimize the number of necessary conversions. Each filter gives a
* list of the formats supported by each input and output pad. The list
* given for each pad need not be distinct - they may be references to the
* same list of formats, as is often the case when a filter supports multiple
* formats, but will always output the same format as it is given in input.
*
* In this way, a list of possible input formats and a list of possible
* output formats are associated with each link. When a set of formats is
* negotiated over a link, the input and output lists are merged to form a
* new list containing only the common elements of each list. In the case
* that there were no common elements, a format conversion is necessary.
* Otherwise, the lists are merged, and all other links which reference
* either of the format lists involved in the merge are also affected.
*
* For example, consider the filter chain:
* filter (a) --> (b) filter (b) --> (c) filter
*
* where the letters in parenthesis indicate a list of formats supported on
* the input or output of the link. Suppose the lists are as follows:
* (a) = {A, B}
* (b) = {A, B, C}
* (c) = {B, C}
*
* First, the first link's lists are merged, yielding:
* filter (a) --> (a) filter (a) --> (c) filter
*
* Notice that format list (b) now refers to the same list as filter list (a).
* Next, the lists for the second link are merged, yielding:
* filter (a) --> (a) filter (a) --> (a) filter
*
* where (a) = {B}.
*
* Unfortunately, when the format lists at the two ends of a link are merged,
* we must ensure that all links which reference either pre-merge format list
* get updated as well. Therefore, we have the format list structure store a
* pointer to each of the pointers to itself.
*/
struct AVFilterFormats {
unsigned nb_formats; ///< number of formats
int *formats; ///< list of media formats
unsigned refcount; ///< number of references to this list
struct AVFilterFormats ***refs; ///< references to this list
};
/**
* A list of supported channel layouts.
*
* The list works the same as AVFilterFormats, except for the following
* differences:
* - A list with all_layouts = 1 means all channel layouts with a known
* disposition; nb_channel_layouts must then be 0.
* - A list with all_counts = 1 means all channel counts, with a known or
* unknown disposition; nb_channel_layouts must then be 0 and all_layouts 1.
* - The list must not contain a layout with a known disposition and a
* channel count with unknown disposition with the same number of channels
* (e.g. AV_CH_LAYOUT_STEREO and FF_COUNT2LAYOUT(2).
*/
struct AVFilterChannelLayouts {
uint64_t *channel_layouts; ///< list of channel layouts
int nb_channel_layouts; ///< number of channel layouts
char all_layouts; ///< accept any known channel layout
char all_counts; ///< accept any channel layout or count
unsigned refcount; ///< number of references to this list
struct AVFilterChannelLayouts ***refs; ///< references to this list
};
/**
* Encode a channel count as a channel layout.
* FF_COUNT2LAYOUT(c) means any channel layout with c channels, with a known
* or unknown disposition.
* The result is only valid inside AVFilterChannelLayouts and immediately
* related functions.
*/
#define FF_COUNT2LAYOUT(c) (0x8000000000000000ULL | (c))
/**
* Decode a channel count encoded as a channel layout.
* Return 0 if the channel layout was a real one.
*/
#define FF_LAYOUT2COUNT(l) (((l) & 0x8000000000000000ULL) ? \
(int)((l) & 0x7FFFFFFF) : 0)
/**
avfilter/formats: Factor checking for mergeability out of ff_merge_* The callers of the ff_merge_*() functions fall into two categories with quite different needs: One caller is can_merge_formats() which only wants to test for mergeability without it merging anything. In order to do so, it duplicates the lists it intends to test and resets their owners so that they are not modified by ff_merge_*(). It also means that it needs to receive the merged list (and not only an int containing whether the lists are mergeable) to properly free it. The other callers want the lists to be actually merged. But given the fact that ff_merge_*() automatically updates the owners of the lists, they only want the information whether the merge succeeded or not; they don't want a link to the new list. Therefore this commit splits these functions in two: ff_merge_*() for the latter callers and ff_can_merge_*() for the former. ff_merge_*() doesn't need to return a pointer to the combined list at all and hence these functions have been modified to return an int, which allows to distinguish between incompability and memory allocation failures. ff_can_merge_*() meanwhile doesn't modify its arguments at all obviating the need for copies. This in turn implies that there is no reason to return a pointer to the new list, as nothing needs to be freed. These functions therefore return an int as well. This allowed to completely remove can_merge_formats() in avfiltergraph.c. Notice that no ff_can_merge_channel_layouts() has been created, because there is currently no caller for this. It could be added if needed. Reviewed-by: Nicolas George <george@nsup.org> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-08-14 14:47:01 +00:00
* Check the formats/samplerates lists for compatibility for merging
* without actually merging.
*
avfilter/formats: Factor checking for mergeability out of ff_merge_* The callers of the ff_merge_*() functions fall into two categories with quite different needs: One caller is can_merge_formats() which only wants to test for mergeability without it merging anything. In order to do so, it duplicates the lists it intends to test and resets their owners so that they are not modified by ff_merge_*(). It also means that it needs to receive the merged list (and not only an int containing whether the lists are mergeable) to properly free it. The other callers want the lists to be actually merged. But given the fact that ff_merge_*() automatically updates the owners of the lists, they only want the information whether the merge succeeded or not; they don't want a link to the new list. Therefore this commit splits these functions in two: ff_merge_*() for the latter callers and ff_can_merge_*() for the former. ff_merge_*() doesn't need to return a pointer to the combined list at all and hence these functions have been modified to return an int, which allows to distinguish between incompability and memory allocation failures. ff_can_merge_*() meanwhile doesn't modify its arguments at all obviating the need for copies. This in turn implies that there is no reason to return a pointer to the new list, as nothing needs to be freed. These functions therefore return an int as well. This allowed to completely remove can_merge_formats() in avfiltergraph.c. Notice that no ff_can_merge_channel_layouts() has been created, because there is currently no caller for this. It could be added if needed. Reviewed-by: Nicolas George <george@nsup.org> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-08-14 14:47:01 +00:00
* @return 1 if they are compatible, 0 if not.
*/
avfilter/formats: Factor checking for mergeability out of ff_merge_* The callers of the ff_merge_*() functions fall into two categories with quite different needs: One caller is can_merge_formats() which only wants to test for mergeability without it merging anything. In order to do so, it duplicates the lists it intends to test and resets their owners so that they are not modified by ff_merge_*(). It also means that it needs to receive the merged list (and not only an int containing whether the lists are mergeable) to properly free it. The other callers want the lists to be actually merged. But given the fact that ff_merge_*() automatically updates the owners of the lists, they only want the information whether the merge succeeded or not; they don't want a link to the new list. Therefore this commit splits these functions in two: ff_merge_*() for the latter callers and ff_can_merge_*() for the former. ff_merge_*() doesn't need to return a pointer to the combined list at all and hence these functions have been modified to return an int, which allows to distinguish between incompability and memory allocation failures. ff_can_merge_*() meanwhile doesn't modify its arguments at all obviating the need for copies. This in turn implies that there is no reason to return a pointer to the new list, as nothing needs to be freed. These functions therefore return an int as well. This allowed to completely remove can_merge_formats() in avfiltergraph.c. Notice that no ff_can_merge_channel_layouts() has been created, because there is currently no caller for this. It could be added if needed. Reviewed-by: Nicolas George <george@nsup.org> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-08-14 14:47:01 +00:00
int ff_can_merge_formats(const AVFilterFormats *a, const AVFilterFormats *b,
enum AVMediaType type);
int ff_can_merge_samplerates(const AVFilterFormats *a, const AVFilterFormats *b);
/**
* Merge the formats/channel layouts/samplerates lists if they are compatible
* and update all the references of a and b to point to the combined list and
* free the old lists as needed. The combined list usually contains the
* intersection of the lists of a and b.
*
* Both a and b must have owners (i.e. refcount > 0) for these functions.
*
* @return 1 if merging succeeded, 0 if a and b are incompatible
* and negative AVERROR code on failure.
* a and b are unmodified if 0 is returned.
*/
int ff_merge_channel_layouts(AVFilterChannelLayouts *a,
AVFilterChannelLayouts *b);
int ff_merge_formats(AVFilterFormats *a, AVFilterFormats *b,
enum AVMediaType type);
int ff_merge_samplerates(AVFilterFormats *a, AVFilterFormats *b);
/**
* Construct an empty AVFilterChannelLayouts/AVFilterFormats struct --
* representing any channel layout (with known disposition)/sample rate.
*/
av_warn_unused_result
AVFilterChannelLayouts *ff_all_channel_layouts(void);
av_warn_unused_result
AVFilterFormats *ff_all_samplerates(void);
/**
* Construct an AVFilterChannelLayouts coding for any channel layout, with
* known or unknown disposition.
*/
av_warn_unused_result
AVFilterChannelLayouts *ff_all_channel_counts(void);
av_warn_unused_result
AVFilterChannelLayouts *ff_make_format64_list(const int64_t *fmts);
Merge remote-tracking branch 'qatar/master' * qatar/master: (26 commits) fate: use diff -b in oneline comparison Add missing version bumps and APIchanges/Changelog entries. lavfi: move buffer management function to a separate file. lavfi: move formats-related functions from default.c to formats.c lavfi: move video-related functions to a separate file. fate: make smjpeg a demux test fate: separate sierra-vmd audio and video tests fate: separate smacker audio and video tests libmp3lame: set supported channel layouts. avconv: automatically insert asyncts when -async is used. avconv: add support for audio filters. lavfi: add asyncts filter. lavfi: add aformat filter lavfi: add an audio buffer sink. lavfi: add an audio buffer source. buffersrc: add av_buffersrc_write_frame(). buffersrc: fix invalid read in uninit if the fifo hasn't been allocated lavfi: rename vsrc_buffer.c to buffersrc.c avfiltergraph: reindent lavfi: add channel layout/sample rate negotiation. ... Conflicts: Changelog doc/APIchanges doc/filters.texi ffmpeg.c ffprobe.c libavcodec/libmp3lame.c libavfilter/Makefile libavfilter/af_aformat.c libavfilter/allfilters.c libavfilter/avfilter.c libavfilter/avfilter.h libavfilter/avfiltergraph.c libavfilter/buffersrc.c libavfilter/defaults.c libavfilter/formats.c libavfilter/src_buffer.c libavfilter/version.h libavfilter/vf_yadif.c libavfilter/vsrc_buffer.c libavfilter/vsrc_buffer.h libavutil/avutil.h tests/fate/audio.mak tests/fate/demux.mak tests/fate/video.mak Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-05-16 00:27:31 +00:00
#if LIBAVFILTER_VERSION_MAJOR < 8
AVFilterChannelLayouts *avfilter_make_format64_list(const int64_t *fmts);
#endif
Merge remote-tracking branch 'qatar/master' * qatar/master: (26 commits) fate: use diff -b in oneline comparison Add missing version bumps and APIchanges/Changelog entries. lavfi: move buffer management function to a separate file. lavfi: move formats-related functions from default.c to formats.c lavfi: move video-related functions to a separate file. fate: make smjpeg a demux test fate: separate sierra-vmd audio and video tests fate: separate smacker audio and video tests libmp3lame: set supported channel layouts. avconv: automatically insert asyncts when -async is used. avconv: add support for audio filters. lavfi: add asyncts filter. lavfi: add aformat filter lavfi: add an audio buffer sink. lavfi: add an audio buffer source. buffersrc: add av_buffersrc_write_frame(). buffersrc: fix invalid read in uninit if the fifo hasn't been allocated lavfi: rename vsrc_buffer.c to buffersrc.c avfiltergraph: reindent lavfi: add channel layout/sample rate negotiation. ... Conflicts: Changelog doc/APIchanges doc/filters.texi ffmpeg.c ffprobe.c libavcodec/libmp3lame.c libavfilter/Makefile libavfilter/af_aformat.c libavfilter/allfilters.c libavfilter/avfilter.c libavfilter/avfilter.h libavfilter/avfiltergraph.c libavfilter/buffersrc.c libavfilter/defaults.c libavfilter/formats.c libavfilter/src_buffer.c libavfilter/version.h libavfilter/vf_yadif.c libavfilter/vsrc_buffer.c libavfilter/vsrc_buffer.h libavutil/avutil.h tests/fate/audio.mak tests/fate/demux.mak tests/fate/video.mak Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-05-16 00:27:31 +00:00
/**
* A helper for query_formats() which sets all links to the same list of channel
* layouts/sample rates. If there are no links hooked to this filter, the list
* is freed.
*/
av_warn_unused_result
int ff_set_common_channel_layouts(AVFilterContext *ctx,
AVFilterChannelLayouts *layouts);
av_warn_unused_result
int ff_set_common_samplerates(AVFilterContext *ctx,
AVFilterFormats *samplerates);
/**
* A helper for query_formats() which sets all links to the same list of
* formats. If there are no links hooked to this filter, the list of formats is
* freed.
*/
av_warn_unused_result
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats);
av_warn_unused_result
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout);
/**
* Add *ref as a new reference to f.
*/
av_warn_unused_result
int ff_channel_layouts_ref(AVFilterChannelLayouts *f,
AVFilterChannelLayouts **ref);
/**
* Remove a reference to a channel layouts list.
*/
void ff_channel_layouts_unref(AVFilterChannelLayouts **ref);
void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
AVFilterChannelLayouts **newref);
av_warn_unused_result
int ff_default_query_formats(AVFilterContext *ctx);
/**
* Create a list of supported formats. This is intended for use in
* AVFilter->query_formats().
*
* @param fmts list of media formats, terminated by -1
* @return the format list, with no existing references
*/
av_warn_unused_result
AVFilterFormats *ff_make_format_list(const int *fmts);
/**
* Add fmt to the list of media formats contained in *avff.
* If *avff is NULL the function allocates the filter formats struct
* and puts its pointer in *avff.
*
* @return a non negative value in case of success, or a negative
* value corresponding to an AVERROR code in case of error
*/
av_warn_unused_result
Merge remote-tracking branch 'qatar/master' * qatar/master: vorbis: Validate that the floor 1 X values contain no duplicates. avprobe: Identify codec probe failures rather than calling them unsupported codecs. avformat: Probe codecs at score 0 on buffer exhaustion conditions. avformat: Factorize codec probing. Indeo Audio decoder imc: make IMDCT support stereo output imc: move channel-specific data into separate context lavfi: remove request/poll and drawing functions from public API on next bump lavfi: make avfilter_insert_pad and pals private on next bump. lavfi: make formats API private on next bump. avplay: use buffersrc instead of custom input filter. avtools: move buffer management code from avconv to cmdutils. avconv: don't use InputStream in the buffer management code. avconv: fix exiting when max frames is reached. mpc8: fix maximum bands handling aacdec: Turn PS off when switching to stereo and turn it to implicit when switching to mono. Conflicts: Changelog cmdutils.h ffmpeg.c ffplay.c ffprobe.c libavcodec/avcodec.h libavcodec/mpc8.c libavcodec/v210dec.h libavcodec/version.h libavcodec/vorbisdec.c libavfilter/avfilter.c libavfilter/avfilter.h libavfilter/buffersrc.c libavfilter/formats.c libavfilter/src_movie.c libavfilter/vf_aspect.c libavfilter/vf_blackframe.c libavfilter/vf_boxblur.c libavfilter/vf_crop.c libavfilter/vf_cropdetect.c libavfilter/vf_delogo.c libavfilter/vf_drawbox.c libavfilter/vf_drawtext.c libavfilter/vf_fade.c libavfilter/vf_fifo.c libavfilter/vf_format.c libavfilter/vf_frei0r.c libavfilter/vf_gradfun.c libavfilter/vf_hflip.c libavfilter/vf_hqdn3d.c libavfilter/vf_libopencv.c libavfilter/vf_lut.c libavfilter/vf_overlay.c libavfilter/vf_pad.c libavfilter/vf_scale.c libavfilter/vf_select.c libavfilter/vf_showinfo.c libavfilter/vf_transpose.c libavfilter/vf_unsharp.c libavfilter/vf_yadif.c libavfilter/vsrc_color.c libavfilter/vsrc_testsrc.c libavformat/utils.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-06-05 20:43:44 +00:00
int ff_add_format(AVFilterFormats **avff, int64_t fmt);
/**
* Return a list of all formats supported by FFmpeg for the given media type.
*/
av_warn_unused_result
AVFilterFormats *ff_all_formats(enum AVMediaType type);
/**
* Construct a formats list containing all pixel formats with certain
* properties
*/
av_warn_unused_result
int ff_formats_pixdesc_filter(AVFilterFormats **rfmts, unsigned want, unsigned rej);
//* format is software, non-planar with sub-sampling
#define FF_PIX_FMT_FLAG_SW_FLAT_SUB (1 << 24)
2012-05-30 11:59:30 +00:00
/**
* Construct a formats list containing all planar sample formats.
*/
av_warn_unused_result
2012-05-30 11:59:30 +00:00
AVFilterFormats *ff_planar_sample_fmts(void);
/**
* Add *ref as a new reference to formats.
* That is the pointers will point like in the ascii art below:
* ________
* |formats |<--------.
* | ____ | ____|___________________
* | |refs| | | __|_
* | |* * | | | | | | AVFilterLink
* | |* *--------->|*ref|
* | |____| | | |____|
* |________| |________________________
*/
av_warn_unused_result
int ff_formats_ref(AVFilterFormats *formats, AVFilterFormats **ref);
/**
* If *ref is non-NULL, remove *ref as a reference to the format list
* it currently points to, deallocates that list if this was the last
* reference, and sets *ref to NULL.
*
* Before After
* ________ ________ NULL
* |formats |<--------. |formats | ^
* | ____ | ____|________________ | ____ | ____|________________
* | |refs| | | __|_ | |refs| | | __|_
* | |* * | | | | | | AVFilterLink | |* * | | | | | | AVFilterLink
* | |* *--------->|*ref| | |* | | | |*ref|
* | |____| | | |____| | |____| | | |____|
* |________| |_____________________ |________| |_____________________
*/
void ff_formats_unref(AVFilterFormats **ref);
/**
* Before After
* ________ ________
* |formats |<---------. |formats |<---------.
* | ____ | ___|___ | ____ | ___|___
* | |refs| | | | | | |refs| | | | | NULL
* | |* *--------->|*oldref| | |* *--------->|*newref| ^
* | |* * | | |_______| | |* * | | |_______| ___|___
* | |____| | | |____| | | | |
* |________| |________| |*oldref|
* |_______|
*/
void ff_formats_changeref(AVFilterFormats **oldref, AVFilterFormats **newref);
/**
* Check that fmts is a valid pixel formats list.
*
* In particular, check for duplicates.
*/
int ff_formats_check_pixel_formats(void *log, const AVFilterFormats *fmts);
/**
* Check that fmts is a valid sample formats list.
*
* In particular, check for duplicates.
*/
int ff_formats_check_sample_formats(void *log, const AVFilterFormats *fmts);
/**
* Check that fmts is a valid sample rates list.
*
* In particular, check for duplicates.
*/
int ff_formats_check_sample_rates(void *log, const AVFilterFormats *fmts);
/**
* Check that fmts is a valid channel layouts list.
*
* In particular, check for duplicates.
*/
int ff_formats_check_channel_layouts(void *log, const AVFilterChannelLayouts *fmts);
#endif /* AVFILTER_FORMATS_H */