mirror of
https://github.com/mpv-player/mpv
synced 2024-12-25 16:33:02 +00:00
279 lines
9.1 KiB
C++
279 lines
9.1 KiB
C++
/* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/**
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* Note: these helpers are provided for convenience for C++/Qt applications.
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* This is based on the public API in client.h, and it does not encode any
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* knowledge that is not known or guaranteed outside of the C client API. You
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* can even copy and modify this code as you like, or implement similar things
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* for other languages.
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*/
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#ifndef MPV_CLIENT_API_QTHELPER_H_
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#define MPV_CLIENT_API_QTHELPER_H_
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#include <cstring>
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#include <QVariant>
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#include <QString>
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#include <QList>
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#include <QHash>
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#include <QSharedPointer>
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#include <mpv/client.h>
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namespace mpv {
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namespace qt {
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// Wrapper around mpv_handle. Does refcounting under the hood.
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class Handle
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{
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struct container {
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container(mpv_handle *h) : mpv(h) {}
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~container() { mpv_terminate_destroy(mpv); }
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mpv_handle *mpv;
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};
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QSharedPointer<container> sptr;
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public:
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// Construct a new Handle from a raw mpv_handle with refcount 1. If the
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// last Handle goes out of scope, the mpv_handle will be destroyed with
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// mpv_terminate_destroy().
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// Never destroy the mpv_handle manually when using this wrapper. You
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// will create dangling pointers. Just let the wrapper take care of
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// destroying the mpv_handle.
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// Never create multiple wrappers from the same raw mpv_handle; copy the
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// wrapper instead (that's what it's for).
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static Handle FromRawHandle(mpv_handle *handle) {
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Handle h;
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h.sptr = QSharedPointer<container>(new container(handle));
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return h;
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}
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// Return the raw handle; for use with the libmpv C API.
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operator mpv_handle*() const { return sptr ? (*sptr).mpv : 0; }
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};
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static inline QVariant node_to_variant(const mpv_node *node)
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{
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switch (node->format) {
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case MPV_FORMAT_STRING:
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return QVariant(QString::fromUtf8(node->u.string));
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case MPV_FORMAT_FLAG:
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return QVariant(static_cast<bool>(node->u.flag));
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case MPV_FORMAT_INT64:
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return QVariant(static_cast<qlonglong>(node->u.int64));
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case MPV_FORMAT_DOUBLE:
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return QVariant(node->u.double_);
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case MPV_FORMAT_NODE_ARRAY: {
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mpv_node_list *list = node->u.list;
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QVariantList qlist;
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for (int n = 0; n < list->num; n++)
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qlist.append(node_to_variant(&list->values[n]));
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return QVariant(qlist);
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}
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case MPV_FORMAT_NODE_MAP: {
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mpv_node_list *list = node->u.list;
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QVariantMap qmap;
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for (int n = 0; n < list->num; n++) {
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qmap.insert(QString::fromUtf8(list->keys[n]),
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node_to_variant(&list->values[n]));
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}
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return QVariant(qmap);
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}
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default: // MPV_FORMAT_NONE, unknown values (e.g. future extensions)
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return QVariant();
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}
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}
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struct node_builder {
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node_builder(const QVariant& v) {
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set(&node_, v);
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}
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~node_builder() {
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free_node(&node_);
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}
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mpv_node *node() { return &node_; }
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private:
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Q_DISABLE_COPY(node_builder)
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mpv_node node_;
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mpv_node_list *create_list(mpv_node *dst, bool is_map, int num) {
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dst->format = is_map ? MPV_FORMAT_NODE_MAP : MPV_FORMAT_NODE_ARRAY;
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mpv_node_list *list = new mpv_node_list();
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dst->u.list = list;
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if (!list)
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goto err;
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list->values = new mpv_node[num]();
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if (!list->values)
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goto err;
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if (is_map) {
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list->keys = new char*[num]();
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if (!list->keys)
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goto err;
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}
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return list;
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err:
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free_node(dst);
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return NULL;
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}
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char *dup_qstring(const QString &s) {
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QByteArray b = s.toUtf8();
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char *r = new char[b.size() + 1];
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if (r)
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std::memcpy(r, b.data(), b.size() + 1);
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return r;
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}
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bool test_type(const QVariant &v, QMetaType::Type t) {
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// The Qt docs say: "Although this function is declared as returning
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// "QVariant::Type(obsolete), the return value should be interpreted
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// as QMetaType::Type."
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// So a cast really seems to be needed to avoid warnings (urgh).
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return static_cast<int>(v.type()) == static_cast<int>(t);
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}
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void set(mpv_node *dst, const QVariant &src) {
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if (test_type(src, QMetaType::QString)) {
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dst->format = MPV_FORMAT_STRING;
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dst->u.string = dup_qstring(src.toString());
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if (!dst->u.string)
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goto fail;
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} else if (test_type(src, QMetaType::Bool)) {
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dst->format = MPV_FORMAT_FLAG;
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dst->u.flag = src.toBool() ? 1 : 0;
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} else if (test_type(src, QMetaType::Int) ||
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test_type(src, QMetaType::LongLong) ||
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test_type(src, QMetaType::UInt) ||
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test_type(src, QMetaType::ULongLong))
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{
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dst->format = MPV_FORMAT_INT64;
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dst->u.int64 = src.toLongLong();
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} else if (test_type(src, QMetaType::Double)) {
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dst->format = MPV_FORMAT_DOUBLE;
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dst->u.double_ = src.toDouble();
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} else if (src.canConvert<QVariantList>()) {
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QVariantList qlist = src.toList();
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mpv_node_list *list = create_list(dst, false, qlist.size());
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if (!list)
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goto fail;
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list->num = qlist.size();
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for (int n = 0; n < qlist.size(); n++)
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set(&list->values[n], qlist[n]);
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} else if (src.canConvert<QVariantMap>()) {
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QVariantMap qmap = src.toMap();
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mpv_node_list *list = create_list(dst, true, qmap.size());
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if (!list)
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goto fail;
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list->num = qmap.size();
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for (int n = 0; n < qmap.size(); n++) {
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list->keys[n] = dup_qstring(qmap.keys()[n]);
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if (!list->keys[n]) {
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free_node(dst);
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goto fail;
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}
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set(&list->values[n], qmap.values()[n]);
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}
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} else {
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goto fail;
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}
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return;
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fail:
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dst->format = MPV_FORMAT_NONE;
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}
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void free_node(mpv_node *dst) {
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switch (dst->format) {
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case MPV_FORMAT_STRING:
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delete[] dst->u.string;
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break;
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case MPV_FORMAT_NODE_ARRAY:
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case MPV_FORMAT_NODE_MAP: {
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mpv_node_list *list = dst->u.list;
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if (list) {
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for (int n = 0; n < list->num; n++) {
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if (list->keys)
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delete[] list->keys[n];
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if (list->values)
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free_node(&list->values[n]);
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}
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delete[] list->keys;
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delete[] list->values;
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}
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delete list;
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break;
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}
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default: ;
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}
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dst->format = MPV_FORMAT_NONE;
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}
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};
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/**
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* RAII wrapper that calls mpv_free_node_contents() on the pointer.
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*/
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struct node_autofree {
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mpv_node *ptr;
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node_autofree(mpv_node *a_ptr) : ptr(a_ptr) {}
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~node_autofree() { mpv_free_node_contents(ptr); }
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};
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/**
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* Return the given property as mpv_node converted to QVariant, or QVariant()
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* on error.
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*
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* @param name the property name
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*/
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static inline QVariant get_property_variant(mpv_handle *ctx, const QString &name)
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{
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mpv_node node;
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if (mpv_get_property(ctx, name.toUtf8().data(), MPV_FORMAT_NODE, &node) < 0)
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return QVariant();
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node_autofree f(&node);
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return node_to_variant(&node);
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}
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/**
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* Set the given property as mpv_node converted from the QVariant argument.
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*/
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static inline int set_property_variant(mpv_handle *ctx, const QString &name,
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const QVariant &v)
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{
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node_builder node(v);
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return mpv_set_property(ctx, name.toUtf8().data(), MPV_FORMAT_NODE, node.node());
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}
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/**
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* Set the given option as mpv_node converted from the QVariant argument.
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*/
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static inline int set_option_variant(mpv_handle *ctx, const QString &name,
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const QVariant &v)
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{
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node_builder node(v);
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return mpv_set_option(ctx, name.toUtf8().data(), MPV_FORMAT_NODE, node.node());
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}
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/**
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* mpv_command_node() equivalent. Returns QVariant() on error (and
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* unfortunately, the same on success).
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*/
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static inline QVariant command_variant(mpv_handle *ctx, const QVariant &args)
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{
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node_builder node(args);
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mpv_node res;
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if (mpv_command_node(ctx, node.node(), &res) < 0)
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return QVariant();
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node_autofree f(&res);
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return node_to_variant(&res);
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}
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}
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}
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#endif
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