pipewire/pipewire-pulseaudio/src/format.c

/***
  This file is part of PulseAudio.

  Copyright 2011 Intel Corporation
  Copyright 2011 Collabora Multimedia
  Copyright 2011 Arun Raghavan <arun.raghavan@collabora.co.uk>

  PulseAudio 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.

  PulseAudio 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
  General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <pulse/xmalloc.h>
#include <pulse/format.h>

#include "core-format.h"
#include "json.h"
#include "internal.h"
#include "strbuf.h"

#define PA_JSON_MIN_KEY "min"
#define PA_JSON_MAX_KEY "max"

static int pa_format_info_prop_compatible(const char *one, const char *two);

static const uint32_t audio_formats[] = {
	[PA_SAMPLE_U8] = SPA_AUDIO_FORMAT_U8,
	[PA_SAMPLE_ALAW] = SPA_AUDIO_FORMAT_UNKNOWN,
	[PA_SAMPLE_ULAW] = SPA_AUDIO_FORMAT_UNKNOWN,
	[PA_SAMPLE_S16NE] = SPA_AUDIO_FORMAT_S16,
	[PA_SAMPLE_S16RE] = SPA_AUDIO_FORMAT_S16_OE,
	[PA_SAMPLE_FLOAT32NE] = SPA_AUDIO_FORMAT_F32,
	[PA_SAMPLE_FLOAT32RE] = SPA_AUDIO_FORMAT_F32_OE,
	[PA_SAMPLE_S32NE] = SPA_AUDIO_FORMAT_S32,
	[PA_SAMPLE_S32RE] = SPA_AUDIO_FORMAT_S32_OE,
	[PA_SAMPLE_S24NE] = SPA_AUDIO_FORMAT_S24,
	[PA_SAMPLE_S24RE] = SPA_AUDIO_FORMAT_S24_OE,
	[PA_SAMPLE_S24_32NE] = SPA_AUDIO_FORMAT_S24_32,
	[PA_SAMPLE_S24_32RE] = SPA_AUDIO_FORMAT_S24_32_OE,
};

static inline uint32_t format_pa2id(pa_sample_format_t format)
{
	if (format < 0 || (size_t)format >= SPA_N_ELEMENTS(audio_formats))
		return SPA_AUDIO_FORMAT_UNKNOWN;
	return audio_formats[format];
}

static inline pa_sample_format_t format_id2pa(uint32_t id)
{
	size_t i;
	for (i = 0; i < SPA_N_ELEMENTS(audio_formats); i++) {
		if (id == audio_formats[i])
			return i;
	}
	return PA_SAMPLE_INVALID;
}

static const char* const _encoding_str_table[]= {
    [PA_ENCODING_PCM] = "pcm",
    [PA_ENCODING_AC3_IEC61937] = "ac3-iec61937",
    [PA_ENCODING_EAC3_IEC61937] = "eac3-iec61937",
    [PA_ENCODING_MPEG_IEC61937] = "mpeg-iec61937",
    [PA_ENCODING_DTS_IEC61937] = "dts-iec61937",
    [PA_ENCODING_MPEG2_AAC_IEC61937] = "mpeg2-aac-iec61937",
#if PA_CHECK_VERSION(13, 0, 0)
    [PA_ENCODING_TRUEHD_IEC61937] = "truehd-iec61937",
    [PA_ENCODING_DTSHD_IEC61937] = "dtshd-iec61937",
#endif
    [PA_ENCODING_ANY] = "any",
};

SPA_EXPORT
const char *pa_encoding_to_string(pa_encoding_t e) {
    if (e < 0 || e >= PA_ENCODING_MAX)
        return NULL;

    return _encoding_str_table[e];
}

SPA_EXPORT
pa_encoding_t pa_encoding_from_string(const char *encoding) {
    pa_encoding_t e;

    for (e = PA_ENCODING_ANY; e < PA_ENCODING_MAX; e++)
        if (pa_streq(_encoding_str_table[e], encoding))
            return e;

    return PA_ENCODING_INVALID;
}

SPA_EXPORT
pa_format_info* pa_format_info_new(void) {
    pa_format_info *f = pa_xnew(pa_format_info, 1);

    f->encoding = PA_ENCODING_INVALID;
    f->plist = pa_proplist_new();

    return f;
}

SPA_EXPORT
pa_format_info* pa_format_info_copy(const pa_format_info *src) {
    pa_format_info *dest;

    pa_assert(src);

    dest = pa_xnew(pa_format_info, 1);

    dest->encoding = src->encoding;

    if (src->plist)
        dest->plist = pa_proplist_copy(src->plist);
    else
        dest->plist = NULL;

    return dest;
}

SPA_EXPORT
void pa_format_info_free(pa_format_info *f) {
    pa_assert(f);

    pa_proplist_free(f->plist);
    pa_xfree(f);
}

SPA_EXPORT
int pa_format_info_valid(const pa_format_info *f) {
    return (f->encoding >= 0 && f->encoding < PA_ENCODING_MAX && f->plist != NULL);
}

SPA_EXPORT
int pa_format_info_is_pcm(const pa_format_info *f) {
    return f->encoding == PA_ENCODING_PCM;
}

SPA_EXPORT
char *pa_format_info_snprint(char *s, size_t l, const pa_format_info *f) {
    char *tmp;

    pa_assert(s);
    pa_assert(l > 0);
    pa_assert(f);

    pa_init_i18n();

    if (!pa_format_info_valid(f))
        pa_snprintf(s, l, _("(invalid)"));
    else {
        tmp = pa_proplist_to_string_sep(f->plist, "  ");
        if (tmp[0])
            pa_snprintf(s, l, "%s, %s", pa_encoding_to_string(f->encoding), tmp);
        else
            pa_snprintf(s, l, "%s", pa_encoding_to_string(f->encoding));
        pa_xfree(tmp);
    }

    return s;
}

SPA_EXPORT
pa_format_info* pa_format_info_from_string(const char *str) {
    pa_format_info *f = pa_format_info_new();
    char *encoding = NULL, *properties = NULL;
    size_t pos;

    pos = strcspn(str, ",");

    encoding = pa_xstrndup(str, pos);
    f->encoding = pa_encoding_from_string(pa_strip(encoding));
    if (f->encoding == PA_ENCODING_INVALID)
        goto error;

    if (pos != strlen(str)) {
        pa_proplist *plist;

        properties = pa_xstrdup(&str[pos+1]);
        plist = pa_proplist_from_string(properties);

        if (!plist)
            goto error;

        pa_proplist_free(f->plist);
        f->plist = plist;
    }

out:
    if (encoding)
        pa_xfree(encoding);
    if (properties)
        pa_xfree(properties);
    return f;

error:
    pa_format_info_free(f);
    f = NULL;
    goto out;
}

SPA_EXPORT
int pa_format_info_is_compatible(const pa_format_info *first, const pa_format_info *second) {
    const char *key;
    void *state = NULL;

    pa_assert(first);
    pa_assert(second);

    if (first->encoding != second->encoding)
        return false;

    while ((key = pa_proplist_iterate(first->plist, &state))) {
        const char *value_one, *value_two;

        value_one = pa_proplist_gets(first->plist, key);
        value_two = pa_proplist_gets(second->plist, key);

        if (!value_two || !pa_format_info_prop_compatible(value_one, value_two))
            return false;
    }

    return true;
}

SPA_EXPORT
pa_format_info* pa_format_info_from_sample_spec(const pa_sample_spec *ss, const pa_channel_map *map) {
    char cm[PA_CHANNEL_MAP_SNPRINT_MAX];
    pa_format_info *f;

    pa_assert(ss && pa_sample_spec_valid(ss));
    pa_assert(!map || pa_channel_map_valid(map));

    f = pa_format_info_new();
    f->encoding = PA_ENCODING_PCM;

    pa_format_info_set_sample_format(f, ss->format);
    pa_format_info_set_rate(f, ss->rate);
    pa_format_info_set_channels(f, ss->channels);

    if (map) {
        pa_channel_map_snprint(cm, sizeof(cm), map);
        pa_format_info_set_prop_string(f, PA_PROP_FORMAT_CHANNEL_MAP, cm);
    }

    return f;
}

/* For PCM streams */
SPA_EXPORT
int pa_format_info_to_sample_spec(const pa_format_info *f, pa_sample_spec *ss, pa_channel_map *map) {
    pa_assert(f);
    pa_assert(ss);

    if (!pa_format_info_is_pcm(f))
        return pa_format_info_to_sample_spec_fake(f, ss, map);

    if (pa_format_info_get_sample_format(f, &ss->format) < 0)
        return -PA_ERR_INVALID;
    if (pa_format_info_get_rate(f, &ss->rate) < 0)
        return -PA_ERR_INVALID;
    if (pa_format_info_get_channels(f, &ss->channels) < 0)
        return -PA_ERR_INVALID;
    if (map && pa_format_info_get_channel_map(f, map) < 0)
        return -PA_ERR_INVALID;

    return 0;
}

SPA_EXPORT
pa_prop_type_t pa_format_info_get_prop_type(const pa_format_info *f, const char *key) {
    const char *str;
    pa_json_object *o;
    const pa_json_object *o1;
    pa_prop_type_t type;

    pa_assert(f);
    pa_assert(key);

    str = pa_proplist_gets(f->plist, key);
    if (!str)
        return PA_PROP_TYPE_INVALID;

    o = pa_json_parse(str);
    if (!o)
        return PA_PROP_TYPE_INVALID;

    switch (pa_json_object_get_type(o)) {
        case PA_JSON_TYPE_INT:
            type = PA_PROP_TYPE_INT;
            break;

        case PA_JSON_TYPE_STRING:
            type = PA_PROP_TYPE_STRING;
            break;

        case PA_JSON_TYPE_ARRAY:
            if (pa_json_object_get_array_length(o) == 0) {
                /* Unlikely, but let's account for this anyway. We need at
                 * least one element to figure out the array type. */
                type = PA_PROP_TYPE_INVALID;
                break;
            }

            o1 = pa_json_object_get_array_member(o, 0);

            if (pa_json_object_get_type(o1) == PA_JSON_TYPE_INT)
                type = PA_PROP_TYPE_INT_ARRAY;
            else if (pa_json_object_get_type(o1) == PA_JSON_TYPE_STRING)
                type = PA_PROP_TYPE_STRING_ARRAY;
            else
                type = PA_PROP_TYPE_INVALID;

            break;

        case PA_JSON_TYPE_OBJECT:
            /* We actually know at this point that it's a int range, but let's
             * confirm. */
            if (!pa_json_object_get_object_member(o, PA_JSON_MIN_KEY)) {
                type = PA_PROP_TYPE_INVALID;
                break;
            }

            if (!pa_json_object_get_object_member(o, PA_JSON_MAX_KEY)) {
                type = PA_PROP_TYPE_INVALID;
                break;
            }

            type = PA_PROP_TYPE_INT_RANGE;
            break;

        default:
            type = PA_PROP_TYPE_INVALID;
            break;
    }

    pa_json_object_free(o);
    return type;
}

SPA_EXPORT
int pa_format_info_get_prop_int(const pa_format_info *f, const char *key, int *v) {
    const char *str;
    pa_json_object *o;

    pa_assert(f);
    pa_assert(key);
    pa_assert(v);

    str = pa_proplist_gets(f->plist, key);
    if (!str)
        return -PA_ERR_NOENTITY;

    o = pa_json_parse(str);
    if (!o) {
        pa_log_debug("Failed to parse format info property '%s'.", key);
        return -PA_ERR_INVALID;
    }

    if (pa_json_object_get_type(o) != PA_JSON_TYPE_INT) {
        pa_log_debug("Format info property '%s' type is not int.", key);
        pa_json_object_free(o);
        return -PA_ERR_INVALID;
    }

    *v = pa_json_object_get_int(o);
    pa_json_object_free(o);

    return 0;
}

SPA_EXPORT
int pa_format_info_get_prop_int_range(const pa_format_info *f, const char *key, int *min, int *max) {
    const char *str;
    pa_json_object *o;
    const pa_json_object *o1;
    int ret = -PA_ERR_INVALID;

    pa_assert(f);
    pa_assert(key);
    pa_assert(min);
    pa_assert(max);

    str = pa_proplist_gets(f->plist, key);
    if (!str)
        return -PA_ERR_NOENTITY;

    o = pa_json_parse(str);
    if (!o) {
        pa_log_debug("Failed to parse format info property '%s'.", key);
        return -PA_ERR_INVALID;
    }

    if (pa_json_object_get_type(o) != PA_JSON_TYPE_OBJECT)
        goto out;

    if (!(o1 = pa_json_object_get_object_member(o, PA_JSON_MIN_KEY)) ||
            (pa_json_object_get_type(o1) != PA_JSON_TYPE_INT))
        goto out;

    *min = pa_json_object_get_int(o1);

    if (!(o1 = pa_json_object_get_object_member(o, PA_JSON_MAX_KEY)) ||
            (pa_json_object_get_type(o1) != PA_JSON_TYPE_INT))
        goto out;

    *max = pa_json_object_get_int(o1);

    ret = 0;

out:
    if (ret < 0)
        pa_log_debug("Format info property '%s' is not a valid int range.", key);

    pa_json_object_free(o);
    return ret;
}

SPA_EXPORT
int pa_format_info_get_prop_int_array(const pa_format_info *f, const char *key, int **values, int *n_values) {
    const char *str;
    pa_json_object *o;
    const pa_json_object *o1;
    int i, ret = -PA_ERR_INVALID;

    pa_assert(f);
    pa_assert(key);
    pa_assert(values);
    pa_assert(n_values);

    str = pa_proplist_gets(f->plist, key);
    if (!str)
        return -PA_ERR_NOENTITY;

    o = pa_json_parse(str);
    if (!o) {
        pa_log_debug("Failed to parse format info property '%s'.", key);
        return -PA_ERR_INVALID;
    }

    if (pa_json_object_get_type(o) != PA_JSON_TYPE_ARRAY)
        goto out;

    *n_values = pa_json_object_get_array_length(o);
    *values = pa_xnew(int, *n_values);

    for (i = 0; i < *n_values; i++) {
        o1 = pa_json_object_get_array_member(o, i);

        if (pa_json_object_get_type(o1) != PA_JSON_TYPE_INT) {
            goto out;
        }

        (*values)[i] = pa_json_object_get_int(o1);
    }

    ret = 0;

out:
    if (ret < 0)
        pa_log_debug("Format info property '%s' is not a valid int array.", key);

    pa_json_object_free(o);
    return ret;
}

SPA_EXPORT
int pa_format_info_get_prop_string(const pa_format_info *f, const char *key, char **v) {
    const char *str = NULL;
    pa_json_object *o;

    pa_assert(f);
    pa_assert(key);
    pa_assert(v);

    str = pa_proplist_gets(f->plist, key);
    if (!str)
        return -PA_ERR_NOENTITY;

    o = pa_json_parse(str);
    if (!o) {
        pa_log_debug("Failed to parse format info property '%s'.", key);
        return -PA_ERR_INVALID;
    }

    if (pa_json_object_get_type(o) != PA_JSON_TYPE_STRING) {
        pa_log_debug("Format info property '%s' type is not string.", key);
        pa_json_object_free(o);
        return -PA_ERR_INVALID;
    }

    *v = pa_xstrdup(pa_json_object_get_string(o));
    pa_json_object_free(o);

    return 0;
}

SPA_EXPORT
int pa_format_info_get_prop_string_array(const pa_format_info *f, const char *key, char ***values, int *n_values) {
    const char *str;
    pa_json_object *o;
    const pa_json_object *o1;
    int i, ret = -PA_ERR_INVALID;

    pa_assert(f);
    pa_assert(key);
    pa_assert(values);
    pa_assert(n_values);

    str = pa_proplist_gets(f->plist, key);
    if (!str)
        return -PA_ERR_NOENTITY;

    o = pa_json_parse(str);
    if (!o) {
        pa_log_debug("Failed to parse format info property '%s'.", key);
        return -PA_ERR_INVALID;
    }

    if (pa_json_object_get_type(o) != PA_JSON_TYPE_ARRAY)
        goto out;

    *n_values = pa_json_object_get_array_length(o);
    *values = pa_xnew(char *, *n_values);

    for (i = 0; i < *n_values; i++) {
        o1 = pa_json_object_get_array_member(o, i);

        if (pa_json_object_get_type(o1) != PA_JSON_TYPE_STRING) {
            goto out;
        }

        (*values)[i] = pa_xstrdup(pa_json_object_get_string(o1));
    }

    ret = 0;

out:
    if (ret < 0)
        pa_log_debug("Format info property '%s' is not a valid string array.", key);

    pa_json_object_free(o);
    return ret;
}

SPA_EXPORT
void pa_format_info_free_string_array(char **values, int n_values) {
    int i;

    for (i = 0; i < n_values; i++)
        pa_xfree(values[i]);

    pa_xfree(values);
}

SPA_EXPORT
void pa_format_info_set_sample_format(pa_format_info *f, pa_sample_format_t sf) {
    pa_format_info_set_prop_string(f, PA_PROP_FORMAT_SAMPLE_FORMAT, pa_sample_format_to_string(sf));
}

SPA_EXPORT
void pa_format_info_set_rate(pa_format_info *f, int rate) {
    pa_format_info_set_prop_int(f, PA_PROP_FORMAT_RATE, rate);
}

SPA_EXPORT
void pa_format_info_set_channels(pa_format_info *f, int channels) {
    pa_format_info_set_prop_int(f, PA_PROP_FORMAT_CHANNELS, channels);
}

SPA_EXPORT
void pa_format_info_set_channel_map(pa_format_info *f, const pa_channel_map *map) {
    char map_str[PA_CHANNEL_MAP_SNPRINT_MAX];

    pa_channel_map_snprint(map_str, sizeof(map_str), map);

    pa_format_info_set_prop_string(f, PA_PROP_FORMAT_CHANNEL_MAP, map_str);
}

SPA_EXPORT
void pa_format_info_set_prop_int(pa_format_info *f, const char *key, int value) {
    pa_assert(f);
    pa_assert(key);

    pa_proplist_setf(f->plist, key, "%d", value);
}

SPA_EXPORT
void pa_format_info_set_prop_int_array(pa_format_info *f, const char *key, const int *values, int n_values) {
    pa_strbuf *buf;
    char *str;
    int i;

    pa_assert(f);
    pa_assert(key);
    pa_assert(n_values > 0);

    buf = pa_strbuf_new();

    pa_strbuf_printf(buf, "[ %d", values[0]);

    for (i = 1; i < n_values; i++)
        pa_strbuf_printf(buf, ", %d", values[i]);

    pa_strbuf_printf(buf, " ]");
    str = pa_strbuf_to_string_free(buf);

    pa_proplist_sets(f->plist, key, str);
    pa_xfree (str);
}

SPA_EXPORT
void pa_format_info_set_prop_int_range(pa_format_info *f, const char *key, int min, int max) {
    pa_assert(f);
    pa_assert(key);

    pa_proplist_setf(f->plist, key, "{ \"" PA_JSON_MIN_KEY "\": %d, \"" PA_JSON_MAX_KEY "\": %d }",
            min, max);
}

SPA_EXPORT
void pa_format_info_set_prop_string(pa_format_info *f, const char *key, const char *value) {
    pa_assert(f);
    pa_assert(key);

    pa_proplist_setf(f->plist, key, "\"%s\"", value);
}

SPA_EXPORT
void pa_format_info_set_prop_string_array(pa_format_info *f, const char *key, const char **values, int n_values) {
    pa_strbuf *buf;
    char *str;
    int i;

    pa_assert(f);
    pa_assert(key);

    buf = pa_strbuf_new();

    pa_strbuf_printf(buf, "[ \"%s\"", values[0]);

    for (i = 1; i < n_values; i++)
        pa_strbuf_printf(buf, ", \"%s\"", values[i]);

    pa_strbuf_printf(buf, " ]");
    str = pa_strbuf_to_string_free(buf);

    pa_proplist_sets(f->plist, key, str);
    pa_xfree (str);
}

static bool pa_json_is_fixed_type(pa_json_object *o) {
    switch(pa_json_object_get_type(o)) {
        case PA_JSON_TYPE_OBJECT:
        case PA_JSON_TYPE_ARRAY:
            return false;

        default:
            return true;
    }
}

static int pa_format_info_prop_compatible(const char *one, const char *two) {
    pa_json_object *o1 = NULL, *o2 = NULL;
    int i, ret = 0;

    o1 = pa_json_parse(one);
    if (!o1)
        goto out;

    o2 = pa_json_parse(two);
    if (!o2)
        goto out;

    /* We don't deal with both values being non-fixed - just because there is no immediate need (FIXME) */
    pa_return_val_if_fail(pa_json_is_fixed_type(o1) || pa_json_is_fixed_type(o2), false);

    if (pa_json_is_fixed_type(o1) && pa_json_is_fixed_type(o2)) {
        ret = pa_json_object_equal(o1, o2);
        goto out;
    }

    if (pa_json_is_fixed_type(o1)) {
        pa_json_object *tmp = o2;
        o2 = o1;
        o1 = tmp;
    }

    /* o2 is now a fixed type, and o1 is not */

    if (pa_json_object_get_type(o1) == PA_JSON_TYPE_ARRAY) {
        for (i = 0; i < pa_json_object_get_array_length(o1); i++) {
            if (pa_json_object_equal(pa_json_object_get_array_member(o1, i), o2)) {
                ret = 1;
                break;
            }
        }
    } else if (pa_json_object_get_type(o1) == PA_JSON_TYPE_OBJECT) {
        /* o1 should be a range type */
        int min, max, v;
        const pa_json_object *o_min = NULL, *o_max = NULL;

        if (pa_json_object_get_type(o2) != PA_JSON_TYPE_INT) {
            /* We don't support non-integer ranges */
            goto out;
        }

        if (!(o_min = pa_json_object_get_object_member(o1, PA_JSON_MIN_KEY)) ||
            pa_json_object_get_type(o_min) != PA_JSON_TYPE_INT)
            goto out;

        if (!(o_max = pa_json_object_get_object_member(o1, PA_JSON_MAX_KEY)) ||
            pa_json_object_get_type(o_max) != PA_JSON_TYPE_INT)
            goto out;

        v = pa_json_object_get_int(o2);
        min = pa_json_object_get_int(o_min);
        max = pa_json_object_get_int(o_max);

        ret = v >= min && v <= max;
    } else {
        pa_log_warn("Got a format type that we don't support");
    }

out:
    if (o1)
        pa_json_object_free(o1);
    if (o2)
        pa_json_object_free(o2);

    return ret;
}

static void format_info_fill_int(pa_format_info *f, const struct spa_pod *val, const char *key)
{
	const struct spa_pod *vals;
	int *int_vals;
	uint32_t *uvals, i, n_vals, choice;
	vals = spa_pod_get_values(val, &n_vals, &choice);
	uvals = SPA_POD_BODY(vals);

	int_vals = alloca(n_vals * sizeof(int));
	for (i = 0; i < n_vals; i++)
		int_vals[i] = uvals[i];

	if (n_vals == 1)
		choice = SPA_CHOICE_None;

	switch (choice) {
	case SPA_CHOICE_None:
		if (n_vals > 0)
			pa_format_info_set_prop_int(f,
					key, int_vals[0]);
		break;

	case SPA_CHOICE_Enum:
		if (n_vals > 1)
			pa_format_info_set_prop_int_array(f,
					key, &int_vals[1], n_vals-1);
		break;

	case SPA_CHOICE_Range:
		if (n_vals > 2)
			pa_format_info_set_prop_int_range(f,
					key, int_vals[1], int_vals[2]);
		break;
	}
}

static void format_info_fill_format(pa_format_info *f, const struct spa_pod *val, const char *key)
{
	const struct spa_pod *vals;
	const char **svals;
	uint32_t *uvals, i, j, n_vals, choice;
	vals = spa_pod_get_values(val, &n_vals, &choice);
	uvals = SPA_POD_BODY(vals);

	svals = alloca(n_vals * sizeof(char *));
	for (i = 0, j = 0; i < n_vals; i++) {
		pa_sample_format_t fmt = format_id2pa(uvals[i]);
		const char *s = pa_sample_format_to_string(fmt);
		if (s)
			svals[j++] = s;
	}
	n_vals = j;
	if (n_vals == 1)
		choice = SPA_CHOICE_None;

	switch (choice) {
	case SPA_CHOICE_None:
		if (n_vals > 0)
			pa_format_info_set_prop_string(f, key, svals[0]);
		break;

	case SPA_CHOICE_Enum:
		if (n_vals > 1)
			pa_format_info_set_prop_string_array(f,
					key, &svals[1], n_vals-1);
		break;
	}
}

pa_format_info* pa_format_info_from_param(const struct spa_pod *param)
{
	pa_format_info *f = pa_format_info_new();
	struct spa_audio_info info = { 0 };
	const struct spa_pod_object *obj;
	const struct spa_pod_prop *p;

	if (param == NULL ||
	    !spa_pod_is_object_type(param, SPA_TYPE_OBJECT_Format))
		goto error;

	spa_format_parse(param, &info.media_type, &info.media_subtype);
	if (info.media_type != SPA_MEDIA_TYPE_audio)
		goto error;

	switch (info.media_subtype) {
	case SPA_MEDIA_SUBTYPE_raw:
		f->encoding = PA_ENCODING_PCM;
		break;
	default:
		goto error;
	}

	obj = (const struct spa_pod_object*)param;
	SPA_POD_OBJECT_FOREACH(obj, p) {
		switch (p->key) {
		case SPA_FORMAT_AUDIO_format:
			format_info_fill_format(f, &p->value, PA_PROP_FORMAT_SAMPLE_FORMAT);
			break;
		case SPA_FORMAT_AUDIO_rate:
			format_info_fill_int(f, &p->value, PA_PROP_FORMAT_RATE);
			break;
		case SPA_FORMAT_AUDIO_channels:
			format_info_fill_int(f, &p->value, PA_PROP_FORMAT_CHANNELS);
			break;
		case SPA_FORMAT_AUDIO_position:
		{
			uint32_t pos[SPA_AUDIO_MAX_CHANNELS], n_pos;

			n_pos = spa_pod_copy_array(&p->value, SPA_TYPE_Id, pos, SPA_AUDIO_MAX_CHANNELS);
			if (n_pos > 0) {
				char cm[PA_CHANNEL_MAP_SNPRINT_MAX];
				pa_channel_map map;
				pw_channel_map_from_positions(&map, n_pos, pos);
				pa_channel_map_snprint(cm, sizeof(cm), &map);
				pa_format_info_set_prop_string(f, PA_PROP_FORMAT_CHANNEL_MAP, cm);
			}
			break;
		}
		default:
			break;
		}
	}
out:
	return f;
error:
	pa_format_info_free(f);
	goto out;
}


int pa_format_parse_param(const struct spa_pod *param, pa_sample_spec *spec, pa_channel_map *map)
{
	struct spa_audio_info info = { 0 };

	if (param == NULL)
		return -EINVAL;

	spa_format_parse(param, &info.media_type, &info.media_subtype);

	if (info.media_type != SPA_MEDIA_TYPE_audio ||
	    info.media_subtype != SPA_MEDIA_SUBTYPE_raw ||
	    spa_format_audio_raw_parse(param, &info.info.raw) < 0 ||
	    !SPA_AUDIO_FORMAT_IS_INTERLEAVED(info.info.raw.format)) {
		return -ENOTSUP;
	}

	spec->format = format_id2pa(info.info.raw.format);
	if (spec->format == PA_SAMPLE_INVALID)
		return -ENOTSUP;

	spec->rate = info.info.raw.rate;
	spec->channels = info.info.raw.channels;

	pw_channel_map_from_positions(map, info.info.raw.channels, info.info.raw.position);

	return 0;
}

const struct spa_pod *pa_format_build_param(struct spa_pod_builder *b,
		uint32_t id, pa_sample_spec *spec, pa_channel_map *map)
{
	struct spa_audio_info_raw info;

	info = SPA_AUDIO_INFO_RAW_INIT( .format = format_pa2id(spec->format),
		                .channels = spec->channels,
		                .rate = spec->rate);
	if (map)
		pw_channel_map_to_positions(map, info.position);

	return spa_format_audio_raw_build(b, id, &info);
}