mp3-utils.h

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/* Simple Plugin API
 *
 * Copyright © 2023 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_AUDIO_MP3_UTILS_H
#define SPA_AUDIO_MP3_UTILS_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <spa/pod/parser.h>
#include <spa/pod/builder.h>
#include <spa/param/audio/format.h>
#include <spa/param/format-utils.h>
 
static inline int
spa_format_audio_mp3_parse(const struct spa_pod *format, struct spa_audio_info_mp3 *info)
{
        int res;
        res = spa_pod_parse_object(format,
                        SPA_TYPE_OBJECT_Format, NULL,
                        SPA_FORMAT_AUDIO_rate,          SPA_POD_OPT_Int(&info->rate),
                        SPA_FORMAT_AUDIO_channels,      SPA_POD_OPT_Int(&info->channels));
        return res;
}
 
static inline struct spa_pod *
spa_format_audio_mp3_build(struct spa_pod_builder *builder, uint32_t id, struct spa_audio_info_mp3 *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_audio),
                        SPA_FORMAT_mediaSubtype,        SPA_POD_Id(SPA_MEDIA_SUBTYPE_mp3),
                        SPA_FORMAT_AUDIO_format,        SPA_POD_Id(SPA_AUDIO_FORMAT_ENCODED),
                        0);
        if (info->rate != 0)
                spa_pod_builder_add(builder,
                        SPA_FORMAT_AUDIO_rate,          SPA_POD_Int(info->rate), 0);
        if (info->channels != 0)
                spa_pod_builder_add(builder,
                        SPA_FORMAT_AUDIO_channels,      SPA_POD_Int(info->channels), 0);
        return (struct spa_pod*)spa_pod_builder_pop(builder, &f);
}
 
#ifdef __cplusplus
}  /* extern "C" */
#endif
 
#endif /* SPA_AUDIO_MP3_UTILS_H */