dsd-utils.h

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/* Simple Plugin API */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */
 
#ifndef SPA_AUDIO_DSD_UTILS_H
#define SPA_AUDIO_DSD_UTILS_H
 
#include <spa/pod/iter.h>
#include <spa/pod/parser.h>
#include <spa/pod/builder.h>
#include <spa/param/format-utils.h>
#include <spa/param/audio/format.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#ifndef SPA_API_AUDIO_DSD_UTILS
 #ifdef SPA_API_IMPL
  #define SPA_API_AUDIO_DSD_UTILS SPA_API_IMPL
 #else
  #define SPA_API_AUDIO_DSD_UTILS static inline
 #endif
#endif
 
SPA_API_AUDIO_DSD_UTILS int
spa_format_audio_dsd_parse(const struct spa_pod *format, struct spa_audio_info_dsd *info)
{
        struct spa_pod *position = NULL;
        int res;
        uint32_t max_position = SPA_N_ELEMENTS(info->position);
 
        info->flags = 0;
        res = spa_pod_parse_object(format,
                        SPA_TYPE_OBJECT_Format, NULL,
                        SPA_FORMAT_AUDIO_bitorder,      SPA_POD_OPT_Id(&info->bitorder),
                        SPA_FORMAT_AUDIO_interleave,    SPA_POD_OPT_Int(&info->interleave),
                        SPA_FORMAT_AUDIO_rate,          SPA_POD_OPT_Int(&info->rate),
                        SPA_FORMAT_AUDIO_channels,      SPA_POD_OPT_Int(&info->channels),
                        SPA_FORMAT_AUDIO_position,      SPA_POD_OPT_Pod(&position));
        if (info->channels > max_position)
                return -ECHRNG;
        if (position == NULL ||
            spa_pod_copy_array(position, SPA_TYPE_Id, info->position, max_position) != info->channels) {
                SPA_FLAG_SET(info->flags, SPA_AUDIO_FLAG_UNPOSITIONED);
                spa_memzero(info->position, max_position * sizeof(info->position[0]));
        }
        return res;
}
 
SPA_API_AUDIO_DSD_UTILS struct spa_pod *
spa_format_audio_dsd_build(struct spa_pod_builder *builder, uint32_t id,
                           const struct spa_audio_info_dsd *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_dsd),
                        0);
        if (info->bitorder != SPA_PARAM_BITORDER_unknown)
                spa_pod_builder_add(builder,
                        SPA_FORMAT_AUDIO_bitorder,      SPA_POD_Id(info->bitorder), 0);
        if (info->interleave != 0)
                spa_pod_builder_add(builder,
                        SPA_FORMAT_AUDIO_interleave,    SPA_POD_Int(info->interleave), 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);
                if (!SPA_FLAG_IS_SET(info->flags, SPA_AUDIO_FLAG_UNPOSITIONED)) {
                        spa_pod_builder_add(builder, SPA_FORMAT_AUDIO_position,
                                SPA_POD_Array(sizeof(uint32_t), SPA_TYPE_Id,
                                        info->channels, info->position), 0);
                }
        }
        return (struct spa_pod*)spa_pod_builder_pop(builder, &f);
}
 
#ifdef __cplusplus
}  /* extern "C" */
#endif
 
#endif /* SPA_AUDIO_DSD_UTILS_H */