/* PipeWire * * Copyright © 2020 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. */ #include #include #include #include #include #include #include "format.h" static const struct format audio_formats[] = { [SAMPLE_U8] = { SAMPLE_U8, SPA_AUDIO_FORMAT_U8, "u8", 1 }, [SAMPLE_ALAW] = { SAMPLE_ALAW, SPA_AUDIO_FORMAT_UNKNOWN, "aLaw", 1 }, [SAMPLE_ULAW] = { SAMPLE_ULAW, SPA_AUDIO_FORMAT_UNKNOWN, "uLaw", 1 }, [SAMPLE_S16LE] = { SAMPLE_S16LE, SPA_AUDIO_FORMAT_S16_LE, "s16le", 2 }, [SAMPLE_S16BE] = { SAMPLE_S16BE, SPA_AUDIO_FORMAT_S16_BE, "s16be", 2 }, [SAMPLE_FLOAT32LE] = { SAMPLE_FLOAT32LE, SPA_AUDIO_FORMAT_F32_LE, "float32le", 4 }, [SAMPLE_FLOAT32BE] = { SAMPLE_FLOAT32BE, SPA_AUDIO_FORMAT_F32_BE, "float32be", 4 }, [SAMPLE_S32LE] = { SAMPLE_S32LE, SPA_AUDIO_FORMAT_S32_LE, "s32le", 4 }, [SAMPLE_S32BE] = { SAMPLE_S32BE, SPA_AUDIO_FORMAT_S32_BE, "s32be", 4 }, [SAMPLE_S24LE] = { SAMPLE_S24LE, SPA_AUDIO_FORMAT_S24_LE, "s24le", 3 }, [SAMPLE_S24BE] = { SAMPLE_S24BE, SPA_AUDIO_FORMAT_S24_BE, "s24be", 3 }, [SAMPLE_S24_32LE] = { SAMPLE_S24_32LE, SPA_AUDIO_FORMAT_S24_32_LE, "s24-32le", 4 }, [SAMPLE_S24_32BE] = { SAMPLE_S24_32BE, SPA_AUDIO_FORMAT_S24_32_BE, "s24-32be", 4 }, #if __BYTE_ORDER == __BIG_ENDIAN { SAMPLE_S16BE, SPA_AUDIO_FORMAT_S16_BE, "s16ne", 2 }, { SAMPLE_FLOAT32BE, SPA_AUDIO_FORMAT_F32_BE, "float32ne", 4 }, { SAMPLE_S32BE, SPA_AUDIO_FORMAT_S32_BE, "s32ne", 4 }, { SAMPLE_S24BE, SPA_AUDIO_FORMAT_S24_BE, "s24ne", 3 }, { SAMPLE_S24_32BE, SPA_AUDIO_FORMAT_S24_32_BE, "s24-32ne", 4 }, #elif __BYTE_ORDER == __LITTLE_ENDIAN { SAMPLE_S16LE, SPA_AUDIO_FORMAT_S16_LE, "s16ne", 2 }, { SAMPLE_FLOAT32LE, SPA_AUDIO_FORMAT_F32_LE, "float32ne", 4 }, { SAMPLE_S32LE, SPA_AUDIO_FORMAT_S32_LE, "s32ne", 4 }, { SAMPLE_S24LE, SPA_AUDIO_FORMAT_S24_LE, "s24ne", 3 }, { SAMPLE_S24_32LE, SPA_AUDIO_FORMAT_S24_32_LE, "s24-32ne", 4 }, #endif /* planar formats, we just report them as interleaved */ { SAMPLE_U8, SPA_AUDIO_FORMAT_U8P, "u8ne", 1 }, { SAMPLE_S16NE, SPA_AUDIO_FORMAT_S16P, "s16ne", 2 }, { SAMPLE_S24_32NE, SPA_AUDIO_FORMAT_S24_32P, "s24-32ne", 4 }, { SAMPLE_S32NE, SPA_AUDIO_FORMAT_S32P, "s32ne", 4 }, { SAMPLE_S24NE, SPA_AUDIO_FORMAT_S24P, "s24ne", 3 }, { SAMPLE_FLOAT32NE, SPA_AUDIO_FORMAT_F32P, "float32ne", 4 }, }; static const struct channel audio_channels[] = { [CHANNEL_POSITION_MONO] = { SPA_AUDIO_CHANNEL_MONO, "mono", }, [CHANNEL_POSITION_FRONT_LEFT] = { SPA_AUDIO_CHANNEL_FL, "front-left", }, [CHANNEL_POSITION_FRONT_RIGHT] = { SPA_AUDIO_CHANNEL_FR, "front-right", }, [CHANNEL_POSITION_FRONT_CENTER] = { SPA_AUDIO_CHANNEL_FC, "front-center", }, [CHANNEL_POSITION_REAR_CENTER] = { SPA_AUDIO_CHANNEL_RC, "rear-center", }, [CHANNEL_POSITION_REAR_LEFT] = { SPA_AUDIO_CHANNEL_RL, "rear-left", }, [CHANNEL_POSITION_REAR_RIGHT] = { SPA_AUDIO_CHANNEL_RR, "rear-right", }, [CHANNEL_POSITION_LFE] = { SPA_AUDIO_CHANNEL_LFE, "lfe", }, [CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = { SPA_AUDIO_CHANNEL_FLC, "front-left-of-center", }, [CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = { SPA_AUDIO_CHANNEL_FRC, "front-right-of-center", }, [CHANNEL_POSITION_SIDE_LEFT] = { SPA_AUDIO_CHANNEL_SL, "side-left", }, [CHANNEL_POSITION_SIDE_RIGHT] = { SPA_AUDIO_CHANNEL_SR, "side-right", }, [CHANNEL_POSITION_AUX0] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 1, "aux0", }, [CHANNEL_POSITION_AUX1] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 2, "aux1", }, [CHANNEL_POSITION_AUX2] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 3, "aux2", }, [CHANNEL_POSITION_AUX3] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 4, "aux3", }, [CHANNEL_POSITION_AUX4] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 5, "aux4", }, [CHANNEL_POSITION_AUX5] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 6, "aux5", }, [CHANNEL_POSITION_AUX6] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 7, "aux6", }, [CHANNEL_POSITION_AUX7] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 8, "aux7", }, [CHANNEL_POSITION_AUX8] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 9, "aux8", }, [CHANNEL_POSITION_AUX9] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 10, "aux9", }, [CHANNEL_POSITION_AUX10] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 11, "aux10", }, [CHANNEL_POSITION_AUX11] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 12, "aux11", }, [CHANNEL_POSITION_AUX12] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 13, "aux12", }, [CHANNEL_POSITION_AUX13] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 14, "aux13", }, [CHANNEL_POSITION_AUX14] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 15, "aux14", }, [CHANNEL_POSITION_AUX15] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 16, "aux15", }, [CHANNEL_POSITION_AUX16] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 17, "aux16", }, [CHANNEL_POSITION_AUX17] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 18, "aux17", }, [CHANNEL_POSITION_AUX18] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 19, "aux18", }, [CHANNEL_POSITION_AUX19] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 20, "aux19", }, [CHANNEL_POSITION_AUX20] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 21, "aux20", }, [CHANNEL_POSITION_AUX21] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 22, "aux21", }, [CHANNEL_POSITION_AUX22] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 23, "aux22", }, [CHANNEL_POSITION_AUX23] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 24, "aux23", }, [CHANNEL_POSITION_AUX24] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 25, "aux24", }, [CHANNEL_POSITION_AUX25] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 26, "aux25", }, [CHANNEL_POSITION_AUX26] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 27, "aux26", }, [CHANNEL_POSITION_AUX27] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 28, "aux27", }, [CHANNEL_POSITION_AUX28] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 29, "aux28", }, [CHANNEL_POSITION_AUX29] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 30, "aux29", }, [CHANNEL_POSITION_AUX30] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 31, "aux30", }, [CHANNEL_POSITION_AUX31] = { SPA_AUDIO_CHANNEL_CUSTOM_START + 32, "aux31", }, [CHANNEL_POSITION_TOP_CENTER] = { SPA_AUDIO_CHANNEL_TC, "top-center", }, [CHANNEL_POSITION_TOP_FRONT_LEFT] = { SPA_AUDIO_CHANNEL_TFL, "top-front-left", }, [CHANNEL_POSITION_TOP_FRONT_RIGHT] = { SPA_AUDIO_CHANNEL_TFR, "top-front-right", }, [CHANNEL_POSITION_TOP_FRONT_CENTER] = { SPA_AUDIO_CHANNEL_TFC, "top-front-center", }, [CHANNEL_POSITION_TOP_REAR_LEFT] = { SPA_AUDIO_CHANNEL_TRL, "top-rear-left", }, [CHANNEL_POSITION_TOP_REAR_RIGHT] = { SPA_AUDIO_CHANNEL_TRR, "top-rear-right", }, [CHANNEL_POSITION_TOP_REAR_CENTER] = { SPA_AUDIO_CHANNEL_TRC, "top-rear-center", }, }; uint32_t format_pa2id(enum sample_format format) { if (format < 0 || format >= SAMPLE_MAX) return SPA_AUDIO_FORMAT_UNKNOWN; return audio_formats[format].id; } const char *format_id2name(uint32_t format) { int i; for (i = 0; spa_type_audio_format[i].name; i++) { if (spa_type_audio_format[i].type == format) return spa_debug_type_short_name(spa_type_audio_format[i].name); } return "UNKNOWN"; } uint32_t format_name2id(const char *name) { int i; for (i = 0; spa_type_audio_format[i].name; i++) { if (spa_streq(name, spa_debug_type_short_name(spa_type_audio_format[i].name))) return spa_type_audio_format[i].type; } return SPA_AUDIO_CHANNEL_UNKNOWN; } uint32_t format_paname2id(const char *name, size_t size) { size_t i; for (i = 0; i < SPA_N_ELEMENTS(audio_formats); i++) { if (audio_formats[i].name != NULL && strncmp(name, audio_formats[i].name, size) == 0) return audio_formats[i].id; } return SPA_AUDIO_FORMAT_UNKNOWN; } enum sample_format format_id2pa(uint32_t id) { size_t i; for (i = 0; i < SPA_N_ELEMENTS(audio_formats); i++) { if (id == audio_formats[i].id) return audio_formats[i].pa; } return SAMPLE_INVALID; } const char *format_id2paname(uint32_t id) { size_t i; for (i = 0; i < SPA_N_ELEMENTS(audio_formats); i++) { if (id == audio_formats[i].id && audio_formats[i].name != NULL) return audio_formats[i].name; } return "invalid"; } uint32_t sample_spec_frame_size(const struct sample_spec *ss) { switch (ss->format) { case SPA_AUDIO_FORMAT_U8: return ss->channels; case SPA_AUDIO_FORMAT_S16_LE: case SPA_AUDIO_FORMAT_S16_BE: case SPA_AUDIO_FORMAT_S16P: return 2 * ss->channels; case SPA_AUDIO_FORMAT_S24_LE: case SPA_AUDIO_FORMAT_S24_BE: case SPA_AUDIO_FORMAT_S24P: return 3 * ss->channels; case SPA_AUDIO_FORMAT_F32_LE: case SPA_AUDIO_FORMAT_F32_BE: case SPA_AUDIO_FORMAT_F32P: case SPA_AUDIO_FORMAT_S32_LE: case SPA_AUDIO_FORMAT_S32_BE: case SPA_AUDIO_FORMAT_S32P: case SPA_AUDIO_FORMAT_S24_32_LE: case SPA_AUDIO_FORMAT_S24_32_BE: case SPA_AUDIO_FORMAT_S24_32P: return 4 * ss->channels; default: return 0; } } bool sample_spec_valid(const struct sample_spec *ss) { return (sample_spec_frame_size(ss) > 0 && ss->rate > 0 && ss->rate <= RATE_MAX && ss->channels > 0 && ss->channels <= CHANNELS_MAX); } uint32_t channel_pa2id(enum channel_position channel) { if (channel < 0 || (size_t)channel >= SPA_N_ELEMENTS(audio_channels)) return SPA_AUDIO_CHANNEL_UNKNOWN; return audio_channels[channel].channel; } const char *channel_id2name(uint32_t channel) { int i; for (i = 0; spa_type_audio_channel[i].name; i++) { if (spa_type_audio_channel[i].type == channel) return spa_debug_type_short_name(spa_type_audio_channel[i].name); } return "UNK"; } uint32_t channel_name2id(const char *name) { int i; for (i = 0; spa_type_audio_channel[i].name; i++) { if (strcmp(name, spa_debug_type_short_name(spa_type_audio_channel[i].name)) == 0) return spa_type_audio_channel[i].type; } return SPA_AUDIO_CHANNEL_UNKNOWN; } enum channel_position channel_id2pa(uint32_t id, uint32_t *aux) { size_t i; for (i = 0; i < SPA_N_ELEMENTS(audio_channels); i++) { if (id == audio_channels[i].channel) return i; } return CHANNEL_POSITION_AUX0 + ((*aux)++ & 31); } const char *channel_id2paname(uint32_t id, uint32_t *aux) { size_t i; for (i = 0; i < SPA_N_ELEMENTS(audio_channels); i++) { if (id == audio_channels[i].channel && audio_channels[i].name != NULL) return audio_channels[i].name; } return audio_channels[CHANNEL_POSITION_AUX0 + ((*aux)++ & 31)].name; } uint32_t channel_paname2id(const char *name, size_t size) { size_t i; for (i = 0; i < SPA_N_ELEMENTS(audio_channels); i++) { if (strncmp(name, audio_channels[i].name, size) == 0) return audio_channels[i].channel; } return SPA_AUDIO_CHANNEL_UNKNOWN; } void channel_map_to_positions(const struct channel_map *map, uint32_t *pos) { int i; for (i = 0; i < map->channels; i++) pos[i] = map->map[i]; } void channel_map_parse(const char *str, struct channel_map *map) { const char *p = str; size_t len; if (spa_streq(p, "stereo")) { *map = (struct channel_map) { .channels = 2, .map[0] = SPA_AUDIO_CHANNEL_FL, .map[1] = SPA_AUDIO_CHANNEL_FR, }; } else if (spa_streq(p, "surround-21")) { *map = (struct channel_map) { .channels = 3, .map[0] = SPA_AUDIO_CHANNEL_FL, .map[1] = SPA_AUDIO_CHANNEL_FR, .map[2] = SPA_AUDIO_CHANNEL_LFE, }; } else if (spa_streq(p, "surround-40")) { *map = (struct channel_map) { .channels = 4, .map[0] = SPA_AUDIO_CHANNEL_FL, .map[1] = SPA_AUDIO_CHANNEL_FR, .map[2] = SPA_AUDIO_CHANNEL_RL, .map[3] = SPA_AUDIO_CHANNEL_RR, }; } else if (spa_streq(p, "surround-41")) { *map = (struct channel_map) { .channels = 5, .map[0] = SPA_AUDIO_CHANNEL_FL, .map[1] = SPA_AUDIO_CHANNEL_FR, .map[2] = SPA_AUDIO_CHANNEL_RL, .map[3] = SPA_AUDIO_CHANNEL_RR, .map[4] = SPA_AUDIO_CHANNEL_LFE, }; } else if (spa_streq(p, "surround-50")) { *map = (struct channel_map) { .channels = 5, .map[0] = SPA_AUDIO_CHANNEL_FL, .map[1] = SPA_AUDIO_CHANNEL_FR, .map[2] = SPA_AUDIO_CHANNEL_RL, .map[3] = SPA_AUDIO_CHANNEL_RR, .map[4] = SPA_AUDIO_CHANNEL_FC, }; } else if (spa_streq(p, "surround-51")) { *map = (struct channel_map) { .channels = 6, .map[0] = SPA_AUDIO_CHANNEL_FL, .map[1] = SPA_AUDIO_CHANNEL_FR, .map[2] = SPA_AUDIO_CHANNEL_RL, .map[3] = SPA_AUDIO_CHANNEL_RR, .map[4] = SPA_AUDIO_CHANNEL_FC, .map[5] = SPA_AUDIO_CHANNEL_LFE, }; } else if (spa_streq(p, "surround-71")) { *map = (struct channel_map) { .channels = 8, .map[0] = SPA_AUDIO_CHANNEL_FL, .map[1] = SPA_AUDIO_CHANNEL_FR, .map[2] = SPA_AUDIO_CHANNEL_RL, .map[3] = SPA_AUDIO_CHANNEL_RR, .map[4] = SPA_AUDIO_CHANNEL_FC, .map[5] = SPA_AUDIO_CHANNEL_LFE, .map[6] = SPA_AUDIO_CHANNEL_SL, .map[7] = SPA_AUDIO_CHANNEL_SR, }; } else { map->channels = 0; while (*p && map->channels < SPA_AUDIO_MAX_CHANNELS) { if ((len = strcspn(p, ",")) == 0) break; map->map[map->channels++] = channel_paname2id(p, len); p += len + strspn(p+len, ","); } } } bool channel_map_valid(const struct channel_map *map) { uint8_t i; if (map->channels == 0 || map->channels > CHANNELS_MAX) return false; for (i = 0; i < map->channels; i++) if (map->map[i] >= CHANNEL_POSITION_MAX) return false; return true; } static const char * const encoding_names[] = { [ENCODING_ANY] = "ANY", [ENCODING_PCM] = "PCM", [ENCODING_AC3_IEC61937] = "AC3-IEC61937", [ENCODING_EAC3_IEC61937] = "EAC3-IEC61937", [ENCODING_MPEG_IEC61937] = "MPEG-IEC61937", [ENCODING_DTS_IEC61937] = "DTS-IEC61937", [ENCODING_MPEG2_AAC_IEC61937] = "MPEG2-AAC-IEC61937", [ENCODING_TRUEHD_IEC61937] = "TRUEHD-IEC61937", [ENCODING_DTSHD_IEC61937] = "DTSHD-IEC61937", }; const char *format_encoding2name(enum encoding enc) { if (enc >= 0 && enc < (int)SPA_N_ELEMENTS(encoding_names) && encoding_names[enc] != NULL) return encoding_names[enc]; return "INVALID"; } int format_parse_param(const struct spa_pod *param, struct sample_spec *ss, struct channel_map *map) { struct spa_audio_info info = { 0 }; uint32_t i; if (spa_format_parse(param, &info.media_type, &info.media_subtype) < 0) return -ENOTSUP; 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) { return -ENOTSUP; } if (ss) { ss->format = info.info.raw.format; ss->rate = info.info.raw.rate; ss->channels = info.info.raw.channels; } if (map) { map->channels = info.info.raw.channels; for (i = 0; i < map->channels; i++) map->map[i] = info.info.raw.position[i]; } return 0; } const struct spa_pod *format_build_param(struct spa_pod_builder *b, uint32_t id, struct sample_spec *spec, struct channel_map *map) { struct spa_audio_info_raw info; info = SPA_AUDIO_INFO_RAW_INIT( .format = spec->format, .channels = spec->channels, .rate = spec->rate); if (map) channel_map_to_positions(map, info.position); return spa_format_audio_raw_build(b, id, &info); } int format_info_from_spec(struct format_info *info, struct sample_spec *ss, struct channel_map *map) { spa_zero(*info); info->encoding = ENCODING_PCM; if ((info->props = pw_properties_new(NULL, NULL)) == NULL) return -errno; pw_properties_setf(info->props, "format.sample_format", "\"%s\"", format_id2paname(ss->format)); pw_properties_setf(info->props, "format.rate", "%d", ss->rate); pw_properties_setf(info->props, "format.channels", "%d", ss->channels); if (map && map->channels == ss->channels) { char chmap[1024] = ""; int i, o; uint32_t aux = 0; for (i = 0, o = 0; i < map->channels; i++) { o += snprintf(chmap+o, sizeof(chmap)-o, "%s%s", i == 0 ? "" : ",", channel_id2paname(map->map[i], &aux)); } pw_properties_setf(info->props, "format.channel_map", "\"%s\"", chmap); } return 0; } const struct spa_pod *format_info_build_param(struct spa_pod_builder *b, uint32_t id, struct format_info *info) { const char *str, *val; struct sample_spec ss; struct channel_map map, *pmap = NULL; struct spa_json it[2]; float f; int len; spa_zero(ss); spa_zero(map); if (info->encoding != ENCODING_PCM) return NULL; if ((str = pw_properties_get(info->props, "format.sample_format")) == NULL) return NULL; spa_json_init(&it[0], str, strlen(str)); if ((len = spa_json_next(&it[0], &val)) <= 0) return NULL; if (spa_json_is_string(val, len)) { ss.format = format_paname2id(val+1, len-2); if (ss.format == SPA_AUDIO_FORMAT_UNKNOWN) return NULL; } else if (spa_json_is_array(val, len)) { return NULL; } else return NULL; if ((str = pw_properties_get(info->props, "format.rate")) == NULL) return NULL; spa_json_init(&it[0], str, strlen(str)); if ((len = spa_json_next(&it[0], &val)) <= 0) return NULL; if (spa_json_is_float(val, len)) { if (spa_json_parse_float(val, len, &f) <= 0) return NULL; ss.rate = f; } else if (spa_json_is_array(val, len)) { return NULL; } else if (spa_json_is_object(val, len)) { return NULL; } else return NULL; if ((str = pw_properties_get(info->props, "format.channels")) == NULL) return NULL; spa_json_init(&it[0], str, strlen(str)); if ((len = spa_json_next(&it[0], &val)) <= 0) return NULL; if (spa_json_is_float(val, len)) { if (spa_json_parse_float(val, len, &f) <= 0) return NULL; ss.channels = f; } else if (spa_json_is_array(val, len)) { return NULL; } else if (spa_json_is_object(val, len)) { return NULL; } else return NULL; if ((str = pw_properties_get(info->props, "format.channel_map")) != NULL) { spa_json_init(&it[0], str, strlen(str)); if ((len = spa_json_next(&it[0], &val)) <= 0) return NULL; if (!spa_json_is_string(val, len)) return NULL; while ((*str == '\"' || *str == ',') && (len = strcspn(++str, "\",")) > 0) { map.map[map.channels++] = channel_paname2id(str, len); str += len; } if (map.channels == ss.channels) pmap = ↦ } return format_build_param(b, id, &ss, pmap); }