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99feb59cf7
Up until now, it has returned the AVFilterFormats list via an AVFilterFormats** parameter; the actual return value was an int that was always AVERROR(ENOMEM) on error. The AVFilterFormats** argument was a pure output parameter which was only documented by naming the parameter rfmts. Yet nevertheless all callers initialized the underlying AVFilterFormats* to NULL. This commit changes this to return a pointer to AVFilterFormats directly. This is more in line with the API in general, as it allows to avoid checks for intermediate values. Reviewed-by: Nicolas George <george@nsup.org> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
419 lines
17 KiB
C
419 lines
17 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_FORMATS_H
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#define AVFILTER_FORMATS_H
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#include "avfilter.h"
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/**
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* A list of supported formats for one end of a filter link. This is used
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* during the format negotiation process to try to pick the best format to
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* use to minimize the number of necessary conversions. Each filter gives a
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* list of the formats supported by each input and output pad. The list
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* given for each pad need not be distinct - they may be references to the
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* same list of formats, as is often the case when a filter supports multiple
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* formats, but will always output the same format as it is given in input.
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*
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* In this way, a list of possible input formats and a list of possible
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* output formats are associated with each link. When a set of formats is
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* negotiated over a link, the input and output lists are merged to form a
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* new list containing only the common elements of each list. In the case
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* that there were no common elements, a format conversion is necessary.
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* Otherwise, the lists are merged, and all other links which reference
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* either of the format lists involved in the merge are also affected.
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*
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* For example, consider the filter chain:
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* filter (a) --> (b) filter (b) --> (c) filter
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*
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* where the letters in parenthesis indicate a list of formats supported on
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* the input or output of the link. Suppose the lists are as follows:
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* (a) = {A, B}
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* (b) = {A, B, C}
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* (c) = {B, C}
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*
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* First, the first link's lists are merged, yielding:
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* filter (a) --> (a) filter (a) --> (c) filter
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*
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* Notice that format list (b) now refers to the same list as filter list (a).
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* Next, the lists for the second link are merged, yielding:
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* filter (a) --> (a) filter (a) --> (a) filter
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*
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* where (a) = {B}.
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*
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* Unfortunately, when the format lists at the two ends of a link are merged,
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* we must ensure that all links which reference either pre-merge format list
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* get updated as well. Therefore, we have the format list structure store a
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* pointer to each of the pointers to itself.
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*/
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struct AVFilterFormats {
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unsigned nb_formats; ///< number of formats
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int *formats; ///< list of media formats
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unsigned refcount; ///< number of references to this list
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struct AVFilterFormats ***refs; ///< references to this list
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};
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/**
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* A list of supported channel layouts.
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*
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* The list works the same as AVFilterFormats, except for the following
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* differences:
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* - A list with all_layouts = 1 means all channel layouts with a known
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* disposition; nb_channel_layouts must then be 0.
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* - A list with all_counts = 1 means all channel counts, with a known or
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* unknown disposition; nb_channel_layouts must then be 0 and all_layouts 1.
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* - The list must not contain a layout with a known disposition and a
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* channel count with unknown disposition with the same number of channels
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* (e.g. AV_CH_LAYOUT_STEREO and FF_COUNT2LAYOUT(2).
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*/
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struct AVFilterChannelLayouts {
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uint64_t *channel_layouts; ///< list of channel layouts
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int nb_channel_layouts; ///< number of channel layouts
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char all_layouts; ///< accept any known channel layout
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char all_counts; ///< accept any channel layout or count
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unsigned refcount; ///< number of references to this list
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struct AVFilterChannelLayouts ***refs; ///< references to this list
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};
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/**
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* Encode a channel count as a channel layout.
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* FF_COUNT2LAYOUT(c) means any channel layout with c channels, with a known
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* or unknown disposition.
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* The result is only valid inside AVFilterChannelLayouts and immediately
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* related functions.
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*/
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#define FF_COUNT2LAYOUT(c) (0x8000000000000000ULL | (c))
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/**
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* Decode a channel count encoded as a channel layout.
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* Return 0 if the channel layout was a real one.
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*/
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#define FF_LAYOUT2COUNT(l) (((l) & 0x8000000000000000ULL) ? \
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(int)((l) & 0x7FFFFFFF) : 0)
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/**
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* Construct an empty AVFilterChannelLayouts/AVFilterFormats struct --
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* representing any channel layout (with known disposition)/sample rate.
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*/
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av_warn_unused_result
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AVFilterChannelLayouts *ff_all_channel_layouts(void);
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av_warn_unused_result
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AVFilterFormats *ff_all_samplerates(void);
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/**
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* Construct an AVFilterChannelLayouts coding for any channel layout, with
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* known or unknown disposition.
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*/
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av_warn_unused_result
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AVFilterChannelLayouts *ff_all_channel_counts(void);
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av_warn_unused_result
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AVFilterChannelLayouts *ff_make_format64_list(const int64_t *fmts);
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/**
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* Helpers for query_formats() which set all free audio links to the same list
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* of channel layouts/sample rates. If there are no links hooked to this list,
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* the list is freed.
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*/
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av_warn_unused_result
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int ff_set_common_channel_layouts(AVFilterContext *ctx,
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AVFilterChannelLayouts *layouts);
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/**
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* Equivalent to ff_set_common_channel_layouts(ctx, ff_make_format64_list(fmts))
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*/
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av_warn_unused_result
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int ff_set_common_channel_layouts_from_list(AVFilterContext *ctx,
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const int64_t *fmts);
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/**
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* Equivalent to ff_set_common_channel_layouts(ctx, ff_all_channel_counts())
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*/
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av_warn_unused_result
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int ff_set_common_all_channel_counts(AVFilterContext *ctx);
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av_warn_unused_result
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int ff_set_common_samplerates(AVFilterContext *ctx,
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AVFilterFormats *samplerates);
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/**
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* Equivalent to ff_set_common_samplerates(ctx, ff_make_format_list(samplerates))
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*/
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av_warn_unused_result
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int ff_set_common_samplerates_from_list(AVFilterContext *ctx,
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const int *samplerates);
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/**
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* Equivalent to ff_set_common_samplerates(ctx, ff_all_samplerates())
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*/
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av_warn_unused_result
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int ff_set_common_all_samplerates(AVFilterContext *ctx);
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/**
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* A helper for query_formats() which sets all links to the same list of
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* formats. If there are no links hooked to this filter, the list of formats is
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* freed.
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*/
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av_warn_unused_result
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int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats);
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/**
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* Equivalent to ff_set_common_formats(ctx, ff_make_format_list(fmts))
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*/
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av_warn_unused_result
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int ff_set_common_formats_from_list(AVFilterContext *ctx, const int *fmts);
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av_warn_unused_result
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int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout);
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/**
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* Add *ref as a new reference to f.
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*/
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av_warn_unused_result
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int ff_channel_layouts_ref(AVFilterChannelLayouts *f,
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AVFilterChannelLayouts **ref);
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/**
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* Remove a reference to a channel layouts list.
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*/
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void ff_channel_layouts_unref(AVFilterChannelLayouts **ref);
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void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
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AVFilterChannelLayouts **newref);
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av_warn_unused_result
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int ff_default_query_formats(AVFilterContext *ctx);
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/**
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* Create a list of supported formats. This is intended for use in
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* AVFilter->query_formats().
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*
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* @param fmts list of media formats, terminated by -1
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* @return the format list, with no existing references
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*/
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av_warn_unused_result
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AVFilterFormats *ff_make_format_list(const int *fmts);
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/**
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* Add fmt to the list of media formats contained in *avff.
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* If *avff is NULL the function allocates the filter formats struct
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* and puts its pointer in *avff.
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*
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* @return a non negative value in case of success, or a negative
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* value corresponding to an AVERROR code in case of error
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*/
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av_warn_unused_result
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int ff_add_format(AVFilterFormats **avff, int64_t fmt);
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/**
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* Return a list of all formats supported by FFmpeg for the given media type.
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*/
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av_warn_unused_result
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AVFilterFormats *ff_all_formats(enum AVMediaType type);
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/**
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* Construct a formats list containing all pixel formats with certain
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* properties
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*/
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av_warn_unused_result
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AVFilterFormats *ff_formats_pixdesc_filter(unsigned want, unsigned rej);
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//* format is software, non-planar with sub-sampling
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#define FF_PIX_FMT_FLAG_SW_FLAT_SUB (1 << 24)
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/**
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* Construct a formats list containing all planar sample formats.
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*/
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av_warn_unused_result
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AVFilterFormats *ff_planar_sample_fmts(void);
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/**
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* Add *ref as a new reference to formats.
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* That is the pointers will point like in the ascii art below:
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* ________
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* |formats |<--------.
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* | ____ | ____|___________________
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* | |refs| | | __|_
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* | |* * | | | | | | AVFilterLink
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* | |* *--------->|*ref|
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* | |____| | | |____|
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* |________| |________________________
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*/
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av_warn_unused_result
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int ff_formats_ref(AVFilterFormats *formats, AVFilterFormats **ref);
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/**
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* If *ref is non-NULL, remove *ref as a reference to the format list
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* it currently points to, deallocates that list if this was the last
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* reference, and sets *ref to NULL.
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*
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* Before After
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* ________ ________ NULL
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* |formats |<--------. |formats | ^
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* | ____ | ____|________________ | ____ | ____|________________
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* | |refs| | | __|_ | |refs| | | __|_
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* | |* * | | | | | | AVFilterLink | |* * | | | | | | AVFilterLink
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* | |* *--------->|*ref| | |* | | | |*ref|
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* | |____| | | |____| | |____| | | |____|
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* |________| |_____________________ |________| |_____________________
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*/
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void ff_formats_unref(AVFilterFormats **ref);
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/**
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* Before After
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* ________ ________
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* |formats |<---------. |formats |<---------.
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* | ____ | ___|___ | ____ | ___|___
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* | |refs| | | | | | |refs| | | | | NULL
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* | |* *--------->|*oldref| | |* *--------->|*newref| ^
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* | |* * | | |_______| | |* * | | |_______| ___|___
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* | |____| | | |____| | | | |
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* |________| |________| |*oldref|
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* |_______|
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*/
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void ff_formats_changeref(AVFilterFormats **oldref, AVFilterFormats **newref);
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/**
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* Check that fmts is a valid pixel formats list.
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*
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* In particular, check for duplicates.
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*/
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int ff_formats_check_pixel_formats(void *log, const AVFilterFormats *fmts);
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/**
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* Check that fmts is a valid sample formats list.
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*
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* In particular, check for duplicates.
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*/
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int ff_formats_check_sample_formats(void *log, const AVFilterFormats *fmts);
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/**
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* Check that fmts is a valid sample rates list.
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*
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* In particular, check for duplicates.
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*/
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int ff_formats_check_sample_rates(void *log, const AVFilterFormats *fmts);
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/**
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* Check that fmts is a valid channel layouts list.
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*
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* In particular, check for duplicates.
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*/
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int ff_formats_check_channel_layouts(void *log, const AVFilterChannelLayouts *fmts);
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typedef struct AVFilterFormatMerger {
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unsigned offset;
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int (*merge)(void *a, void *b);
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int (*can_merge)(const void *a, const void *b);
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} AVFilterFormatsMerger;
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/**
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* Callbacks and properties to describe the steps of a format negotiation.
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*
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* The steps are:
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*
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* 1. query_formats(): call the callbacks on all filter to set lists of
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* supported formats.
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* When links on a filter must eventually have the same
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* format, the lists of supported formats are the same
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* object in memory.
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* See:
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* http://www.normalesup.org/~george/articles/format_negotiation_in_libavfilter/#12
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*
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*
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* 2. query_formats(): merge lists of supported formats or insert automatic
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* conversion filters.
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* Compute the intersection of the lists of supported
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* formats on the ends of links. If it succeeds, replace
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* both objects with the intersection everywhere they
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* are referenced.
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* If the intersection is empty, insert an automatic
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* conversion filter.
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* If several formats are negotiated at once (format,
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* rate, layout), only merge if all three can be, since
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* the conversion filter can convert all three at once.
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* This process goes on as long as progress is made.
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* See:
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* http://www.normalesup.org/~george/articles/format_negotiation_in_libavfilter/#14
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* http://www.normalesup.org/~george/articles/format_negotiation_in_libavfilter/#29
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*
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* 3. reduce_formats(): try to reduce format conversion within filters.
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* For each link where there is only one supported
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* formats on output, for each output of the connected
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* filter, if the media type is the same and said
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* format is supported, keep only this one.
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* This process goes on as long as progress is made.
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* Rationale: conversion filters will set a large list
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* of supported formats on outputs but users will
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* expect the output to be as close as possible as the
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* input (examples: scale without changing the pixel
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* format, resample without changint the layout).
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* FIXME: this can probably be done by merging the
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* input and output lists instead of re-implementing
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* the logic.
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*
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* 4. swap_sample_fmts():
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* swap_samplerates():
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* swap_channel_layouts(): For each filter with an input with only one
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* supported format, when outputs have several
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* supported formats, put the best one with
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* reference to the input at the beginning of the
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* list, to prepare it for being picked up by
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* pick_formats().
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* The best format is the one that is most
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* similar to the input while not losing too much
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* information.
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* This process need to run only once.
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* FIXME: reduce_formats() operates on all inputs
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* with a single format, swap_*() operates on the
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* first one only: check if the difference makes
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* sense.
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* TODO: the swapping done for one filter can
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* override the swapping done for another filter
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* connected to the same list of formats, maybe
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* it would be better to compute a total score
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* for all connected filters and use the score to
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* pick the format instead of just swapping.
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* TODO: make the similarity logic available as
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* public functions in libavutil.
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*
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* 5. pick_formats(): Choose one format from the lists of supported formats,
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* use it for the link and reduce the list to a single
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* element to force other filters connected to the same
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* list to use it.
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* First process all links where there is a single format
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* and the output links of all filters with an input,
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* trying to preserve similarity between input and
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* outputs.
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* Repeat as long as process is made.
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* Then do a final run for the remaining filters.
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* FIXME: the similarity logic (the ref argument to
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* pick_format()) added in FFmpeg duplicates and
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* overrides the swapping logic added in libav. Better
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* merge them into a score system.
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*/
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typedef struct AVFilterNegotiation {
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unsigned nb_mergers;
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const AVFilterFormatsMerger *mergers;
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const char *conversion_filter;
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unsigned conversion_opts_offset;
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} AVFilterNegotiation;
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const AVFilterNegotiation *ff_filter_get_negotiation(AVFilterLink *link);
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#endif /* AVFILTER_FORMATS_H */
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