mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
271 lines
10 KiB
C
271 lines
10 KiB
C
/*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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
|
|
* 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"
|
|
|
|
/**
|
|
* 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).
|
|
*/
|
|
typedef 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
|
|
} AVFilterChannelLayouts;
|
|
|
|
/**
|
|
* 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)
|
|
|
|
/**
|
|
* Return a channel layouts/samplerates list which contains the intersection of
|
|
* the layouts/samplerates of a and b. Also, all the references of a, all the
|
|
* references of b, and a and b themselves will be deallocated.
|
|
*
|
|
* If a and b do not share any common elements, neither is modified, and NULL
|
|
* is returned.
|
|
*/
|
|
AVFilterChannelLayouts *ff_merge_channel_layouts(AVFilterChannelLayouts *a,
|
|
AVFilterChannelLayouts *b);
|
|
AVFilterFormats *ff_merge_samplerates(AVFilterFormats *a,
|
|
AVFilterFormats *b);
|
|
|
|
/**
|
|
* Construct an empty AVFilterChannelLayouts/AVFilterFormats struct --
|
|
* representing any channel layout (with known disposition)/sample rate.
|
|
*/
|
|
AVFilterChannelLayouts *ff_all_channel_layouts(void);
|
|
AVFilterFormats *ff_all_samplerates(void);
|
|
|
|
/**
|
|
* Construct an AVFilterChannelLayouts coding for any channel layout, with
|
|
* known or unknown disposition.
|
|
*/
|
|
AVFilterChannelLayouts *ff_all_channel_counts(void);
|
|
|
|
AVFilterChannelLayouts *avfilter_make_format64_list(const int64_t *fmts);
|
|
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
int ff_set_common_channel_layouts(AVFilterContext *ctx,
|
|
AVFilterChannelLayouts *layouts);
|
|
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.
|
|
*/
|
|
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats);
|
|
|
|
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout);
|
|
|
|
/**
|
|
* Add *ref as a new reference to f.
|
|
*/
|
|
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);
|
|
|
|
int ff_default_query_formats(AVFilterContext *ctx);
|
|
|
|
/**
|
|
* Set the formats list to all existing formats.
|
|
* This function behaves like ff_default_query_formats(), except it also
|
|
* accepts channel layouts with unknown disposition. It should only be used
|
|
* with audio filters.
|
|
*/
|
|
int ff_query_formats_all(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
|
|
*/
|
|
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
|
|
*/
|
|
int ff_add_format(AVFilterFormats **avff, int64_t fmt);
|
|
|
|
/**
|
|
* Return a list of all formats supported by FFmpeg for the given media type.
|
|
*/
|
|
AVFilterFormats *ff_all_formats(enum AVMediaType type);
|
|
|
|
/**
|
|
* Construct a formats list containing all planar sample formats.
|
|
*/
|
|
AVFilterFormats *ff_planar_sample_fmts(void);
|
|
|
|
/**
|
|
* Return a format list which contains the intersection of the formats of
|
|
* a and b. Also, all the references of a, all the references of b, and
|
|
* a and b themselves will be deallocated.
|
|
*
|
|
* If a and b do not share any common formats, neither is modified, and NULL
|
|
* is returned.
|
|
*/
|
|
AVFilterFormats *ff_merge_formats(AVFilterFormats *a, AVFilterFormats *b,
|
|
enum AVMediaType type);
|
|
|
|
/**
|
|
* Add *ref as a new reference to formats.
|
|
* That is the pointers will point like in the ascii art below:
|
|
* ________
|
|
* |formats |<--------.
|
|
* | ____ | ____|___________________
|
|
* | |refs| | | __|_
|
|
* | |* * | | | | | | AVFilterLink
|
|
* | |* *--------->|*ref|
|
|
* | |____| | | |____|
|
|
* |________| |________________________
|
|
*/
|
|
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);
|
|
|
|
#endif /* AVFILTER_FORMATS_H */
|