diff options
author | Anton Khirnov <anton@khirnov.net> | 2012-05-06 06:59:06 +0200 |
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committer | Anton Khirnov <anton@khirnov.net> | 2012-05-14 21:36:10 +0200 |
commit | 5775a1832c4165e6acc1d307004b38701bb463f4 (patch) | |
tree | 8de340914f00497a4acca827bf673ed26ff4ab9d /libavfilter/formats.h | |
parent | 394a0267abd6a292932f858949449b5cd6f8efda (diff) |
lavfi: add types and functions for channel layout/samplerate negotiation
Diffstat (limited to 'libavfilter/formats.h')
-rw-r--r-- | libavfilter/formats.h | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/libavfilter/formats.h b/libavfilter/formats.h new file mode 100644 index 0000000000..7e0a60114c --- /dev/null +++ b/libavfilter/formats.h @@ -0,0 +1,78 @@ +/* + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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" + +typedef struct AVFilterChannelLayouts { + uint64_t *channel_layouts; ///< list of channel layouts + int nb_channel_layouts; ///< number of channel layouts + + unsigned refcount; ///< number of references to this list + struct AVFilterChannelLayouts ***refs; ///< references to this list +} AVFilterChannelLayouts; + +/** + * 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/sample rate. + */ +AVFilterChannelLayouts *ff_all_channel_layouts(void); +AVFilterFormats *ff_all_samplerates(void); + +/** + * 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. + */ +void ff_set_common_channel_layouts(AVFilterContext *ctx, + AVFilterChannelLayouts *layouts); +void ff_set_common_samplerates(AVFilterContext *ctx, + AVFilterFormats *samplerates); + +int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout); + +/** + * Add *ref as a new reference to f. + */ +void 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); + +#endif // AVFILTER_FORMATS_H |