mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
synced 2025-11-01 22:58:50 -04:00
Work on JSON based format descriptions
This commit is contained in:
Wim Taymans
parent
8432039ee5
commit
ac382c052a
3 changed files with 352 additions and 0 deletions
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@ -39,3 +39,8 @@ executable('test-props2', 'test-props2.c',
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dependencies : [],
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link_with : spalib,
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install : false)
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executable('test-props3', 'test-props3.c',
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include_directories : [spa_inc, spa_libinc ],
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dependencies : [],
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link_with : spalib,
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install : false)
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@ -99,6 +99,55 @@ key: "<name>"
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"framerate": [ "25/1", "30/1" ] }
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* JSON based format description
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[ <type>,
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[ <media-type>, <media-subtype> ],
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{
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<key> : [ <type>, <value>, [ <value>, ... ] ],
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...
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}
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]
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<type> = "123.."
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1: s = string : "value"
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i = int : <number>
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f = float : <float>
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b = bool : true | false
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R = rectangle : [ <width>, <height> ]
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F = fraction : [ <num>, <denom> ]
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2: - = default (only default value present)
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e = enum : [ <value>, ... ]
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f = flags : [ <number> ]
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m = min/max : [ <min>, <max> ]
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s = min/max/step : [ <min>, <max>, <step> ]
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3: u = unset : value is unset, choose from options or default
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o = optional : value does not need to be set
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r = readonly : value is read only
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d = deprecated : value is deprecated
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[ "Format",
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[ "video", "raw"],
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{
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"format" : [ "se", "I420", [ "I420", "YUY2" ] ],
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"size" : [ "Rmu", [320, 240], [[ 640, 480], [1024,786]]],
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"framerate" : [ "Fsu", [25, 1], [[ 0, 1], [65536,1]]]"
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}
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]
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[ "Format",
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[ "audio", "raw"],
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{
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"format" : [ "se", "S16LE", [ "F32LE", "S16LE" ] ],
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"rate" : [ "imu", 44100, [8000, 96000]],
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"channels" : [ "imu", 1, [1, 4096]]"
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"interleaved" : [ "beo", true ]"
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}
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]
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spa_build(SPA_MEDIA_TYPE_VIDEO, SPA_MEDIA_SUBTYPE_RAW,
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type.format_video.format, SPA_PROP_TYPE_ID,
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video_format.I420
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298
spa/tests/test-props3.c
Normal file
298
spa/tests/test-props3.c
Normal file
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@ -0,0 +1,298 @@
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/* Spa
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* Copyright (C) 2017 Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <spa/type-map.h>
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#include <spa/type-map-impl.h>
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#include <spa/log.h>
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#include <spa/node.h>
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#include <spa/loop.h>
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#include <spa/video/format-utils.h>
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#include <spa/format-builder.h>
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#include <lib/debug.h>
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#if 0
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/*
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* JSON based format description
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[ <type>,
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[ <media-type>, <media-subtype> ],
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{
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<key> : [ <type>, <value>, [ <value>, ... ] ],
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...
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}
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]
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<type> = "123.."
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1: s = string : "value"
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i = int : <number>
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f = float : <float>
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b = bool : true | false
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R = rectangle : [ <width>, <height> ]
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F = fraction : [ <num>, <denom> ]
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2: - = default (only default value present)
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e = enum : [ <value>, ... ]
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f = flags : [ <number> ]
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r = min/max : [ <min>, <max> ]
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s = min/max/step : [ <min>, <max>, <step> ]
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3: u = unset : value is unset, choose from options or default
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o = optional : value does not need to be set
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r = readonly : value is read only
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d = deprecated : value is deprecated
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[ "Format",
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[ "video", "raw"],
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{
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"format" : [ "se", "I420", [ "I420", "YUY2" ] ],
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"size" : [ "Rru", [320, 240], [[ 640, 480], [1024,786]]],
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"framerate" : [ "Fsu", [25, 1], [[ 0, 1], [65536,1]]]"
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}
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]
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[ "Format",
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[ "audio", "raw"],
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{
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"format" : [ "se", "S16LE", [ "F32LE", "S16LE" ] ],
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"rate" : [ "iru", 44100, [8000, 96000]],
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"channels" : [ "iru", 1, [1, 4096]]"
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"interleaved" : [ "beo", true ]"
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}
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]
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*/
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#endif
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#include <stddef.h>
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struct spa_json_iter {
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const char *cur;
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const char *end;
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struct spa_json_iter *parent;
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int state;
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int depth;
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};
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#define NONE 0
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#define STRUCT 1
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#define BARE 2
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#define STRING 3
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#define UTF8 4
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#define ESC 5
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static void
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spa_json_iter_init (struct spa_json_iter *iter, const char *data, size_t size)
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{
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iter->end = data + size;
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iter->parent = NULL;
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iter->cur = data;
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iter->state = NONE;
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}
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static int
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spa_json_iter_next (struct spa_json_iter *iter, const char **value)
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{
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int utf8_remain = 0;
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for (;iter->cur < iter->end; iter->cur++) {
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unsigned char cur = (unsigned char) *iter->cur;
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again:
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switch (iter->state) {
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case NONE:
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iter->state = STRUCT;
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iter->depth = 0;
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goto again;
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case STRUCT:
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switch (cur) {
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case '\t': case ' ': case '\r': case '\n': case ':': case ',':
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continue;
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case '"':
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*value = iter->cur;
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iter->state = STRING;
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continue;
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case '[': case '{':
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*value = iter->cur;
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if (++iter->depth > 1)
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continue;
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iter->cur++;
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return 1;
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case '}': case ']':
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if (iter->depth == 0) {
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if (iter->parent)
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iter->parent->cur = iter->cur;
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return 0;
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}
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--iter->depth;
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continue;
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case '-': case 'a' ... 'z': case 'A' ... 'Z': case '0' ... '9':
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*value = iter->cur;
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iter->state = BARE;
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continue;
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}
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return -1;
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case BARE:
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switch (cur) {
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case '\t': case ' ': case '\r': case '\n': case ':': case ',':
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case ']': case '}':
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iter->state = STRUCT;
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if (iter->depth > 0)
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goto again;
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return iter->cur - *value;
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default:
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if (cur >= 32 && cur <= 126)
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continue;
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}
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return -1;
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case STRING:
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switch (cur) {
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case '\\':
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iter->state = ESC;
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continue;
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case '"':
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iter->state = STRUCT;
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if (iter->depth > 0)
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continue;
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iter->cur++;
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return iter->cur - *value;
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case 240 ... 247:
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utf8_remain++;
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case 224 ... 239:
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utf8_remain++;
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case 192 ... 223:
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utf8_remain++;
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iter->state = UTF8;
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continue;
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default:
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if (cur >= 32 && cur <= 126)
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continue;
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}
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return -1;
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case UTF8:
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switch (cur) {
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case 128 ... 191:
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if (--utf8_remain == 0)
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iter->state = STRING;
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continue;
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}
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return -1;
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case ESC:
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switch (cur) {
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case '"': case '\\': case '/': case 'b': case 'f': case 'n': case 'r':
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case 't': case 'u':
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iter->state = STRING;
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continue;
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}
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return -1;
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}
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}
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return iter->depth == 0 ? 0 : -1;
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}
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static void
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spa_json_iter_enter (struct spa_json_iter *iter, struct spa_json_iter *sub)
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{
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sub->end = iter->end;
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sub->parent = iter;
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sub->cur = iter->cur;
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sub->state = NONE;
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}
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static int test_parsing(const char *format)
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{
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struct spa_json_iter iter[5];
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const char *value;
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int len;
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spa_json_iter_init (&iter[0], format, strlen(format));
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if ((len = spa_json_iter_next(&iter[0], &value)) < 0) return len;
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if (*value != '[') return -1;
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spa_json_iter_enter(&iter[0], &iter[1]);
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if ((len = spa_json_iter_next(&iter[1], &value)) < 0) return len;
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if (*value != '"') return -1;
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printf("Type: %.*s\n", len, value);
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if ((len = spa_json_iter_next(&iter[1], &value)) < 0) return len;
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if (*value != '[') return -1;
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spa_json_iter_enter(&iter[1], &iter[2]);
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if ((len = spa_json_iter_next(&iter[2], &value)) < 0) return len;
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if (*value != '"') return -1;
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printf("Media Type: %.*s\n", len, value);
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if ((len = spa_json_iter_next(&iter[2], &value)) < 0) return len;
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if (*value != '"') return -1;
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printf("Media SubType: %.*s\n", len, value);
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if ((len = spa_json_iter_next(&iter[1], &value)) < 0) return len;
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if (*value != '{') return -1;
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spa_json_iter_enter(&iter[1], &iter[2]);
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while ((len = spa_json_iter_next(&iter[2], &value)) > 0) {
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if (*value != '"') return -1;
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printf("Key: %.*s\n", len, value);
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if ((len = spa_json_iter_next(&iter[2], &value)) < 0) return len;
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if (*value != '[') return -1;
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spa_json_iter_enter(&iter[2], &iter[3]);
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if ((len = spa_json_iter_next(&iter[3], &value)) < 0) return len;
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printf("flags: %.*s\n", len, value);
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if ((len = spa_json_iter_next(&iter[3], &value)) < 0) return len;
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printf("default: %.*s\n", len, value);
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if ((len = spa_json_iter_next(&iter[3], &value)) < 0) return len;
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if (*value != '[') return -1;
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spa_json_iter_enter(&iter[3], &iter[4]);
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while ((len = spa_json_iter_next(&iter[4], &value)) > 0) {
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printf("value: %.*s\n", len, value);
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}
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}
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return 0;
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}
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int main(int argc, char *argv[])
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{
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const char *format =
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"[ \"Format\", "
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" [ \"audio\", \"raw\"], "
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" { "
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" \"format\": [ \"se\", \"S16LE\", [ \"F32LE\", \"S16LE\" ]], "
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" \"rate\": [ \"iru\", 44100, [8000, 96000]],"
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" \"channels\": [ \"iru\", 1, [1, 4096]]"
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" \"interleaved\": [ \"beo\", true ]"
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" }"
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"]";
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test_parsing(format);
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return 0;
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}
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