mp3-utils.h

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/* Simple Plugin API */
/* SPDX-FileCopyrightText: Copyright © 2023 Wim Taymans */
/* SPDX-License-Identifier: MIT */
 
#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 */