mjpg-utils.h

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/* Simple Plugin API
 *
 * Copyright © 2018 Wim Taymans
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
 
#ifndef SPA_VIDEO_MJPG_UTILS_H
#define SPA_VIDEO_MJPG_UTILS_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <spa/pod/parser.h>
#include <spa/pod/builder.h>
#include <spa/param/video/mjpg.h>
 
static inline int
spa_format_video_mjpg_parse(const struct spa_pod *format,
                            struct spa_video_info_mjpg *info)
{
        return spa_pod_parse_object(format,
                        SPA_TYPE_OBJECT_Format, NULL,
                        SPA_FORMAT_VIDEO_size,          SPA_POD_OPT_Rectangle(&info->size),
                        SPA_FORMAT_VIDEO_framerate,     SPA_POD_OPT_Fraction(&info->framerate),
                        SPA_FORMAT_VIDEO_maxFramerate,  SPA_POD_OPT_Fraction(&info->max_framerate));
}
 
static inline struct spa_pod *
spa_format_video_mjpg_build(struct spa_pod_builder *builder, uint32_t id,
                           struct spa_video_info_mjpg *info)
{
        struct spa_pod_frame f;
        spa_pod_builder_push_object(builder, &f, SPA_TYPE_OBJECT_Format, id);
        spa_pod_builder_add(builder,
                        SPA_FORMAT_mediaType,           SPA_POD_Id(SPA_MEDIA_TYPE_video),
                        SPA_FORMAT_mediaSubtype,        SPA_POD_Id(SPA_MEDIA_SUBTYPE_mjpg),
                        0);
        if (info->size.width != 0 && info->size.height != 0)
                spa_pod_builder_add(builder,
                        SPA_FORMAT_VIDEO_size,          SPA_POD_Rectangle(&info->size), 0);
        if (info->framerate.denom != 0)
                spa_pod_builder_add(builder,
                        SPA_FORMAT_VIDEO_framerate,     SPA_POD_Fraction(&info->framerate), 0);
        if (info->max_framerate.denom != 0)
                spa_pod_builder_add(builder,
                        SPA_FORMAT_VIDEO_maxFramerate,  SPA_POD_Fraction(info->max_framerate), 0);
        return (struct spa_pod*)spa_pod_builder_pop(builder, &f);
}
 
#ifdef __cplusplus
} /* extern "C" */
#endif
 
#endif /* SPA_VIDEO_MJPG_UTILS_H */