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39
40#include <QDebug>
41
42#include "qgstappsrc_p.h"
43
44QGstAppSrc::QGstAppSrc(QObject *parent)
45 : QObject(parent)
46{
47 m_callbacks.need_data = &QGstAppSrc::on_need_data;
48 m_callbacks.enough_data = &QGstAppSrc::on_enough_data;
49 m_callbacks.seek_data = &QGstAppSrc::on_seek_data;
50}
51
52QGstAppSrc::~QGstAppSrc()
53{
54 if (m_appSrc)
55 gst_object_unref(G_OBJECT(m_appSrc));
56}
57
58bool QGstAppSrc::setup(GstElement* appsrc)
59{
60 if (m_appSrc) {
61 gst_object_unref(G_OBJECT(m_appSrc));
62 m_appSrc = 0;
63 }
64
65 if (!appsrc || !m_stream)
66 return false;
67
68 m_appSrc = GST_APP_SRC(appsrc);
69 gst_object_ref(G_OBJECT(m_appSrc));
70 gst_app_src_set_callbacks(appsrc: m_appSrc, callbacks: (GstAppSrcCallbacks*)&m_callbacks, user_data: this, notify: (GDestroyNotify)&QGstAppSrc::destroy_notify);
71
72 g_object_get(G_OBJECT(m_appSrc), first_property_name: "max-bytes", &m_maxBytes, nullptr);
73
74 if (m_sequential)
75 m_streamType = GST_APP_STREAM_TYPE_STREAM;
76 else
77 m_streamType = GST_APP_STREAM_TYPE_RANDOM_ACCESS;
78 gst_app_src_set_stream_type(appsrc: m_appSrc, type: m_streamType);
79 gst_app_src_set_size(appsrc: m_appSrc, size: (m_sequential) ? -1 : m_stream->size());
80
81 return true;
82}
83
84void QGstAppSrc::setStream(QIODevice *stream)
85{
86 if (m_stream) {
87 disconnect(sender: m_stream, SIGNAL(readyRead()), receiver: this, SLOT(onDataReady()));
88 disconnect(sender: m_stream, SIGNAL(destroyed()), receiver: this, SLOT(streamDestroyed()));
89 m_stream = 0;
90 }
91
92 if (m_appSrc) {
93 gst_object_unref(G_OBJECT(m_appSrc));
94 m_appSrc = 0;
95 }
96
97 m_dataRequestSize = ~0;
98 m_dataRequested = false;
99 m_enoughData = false;
100 m_forceData = false;
101 m_sequential = false;
102 m_maxBytes = 0;
103
104 if (stream) {
105 m_stream = stream;
106 connect(asender: m_stream, SIGNAL(destroyed()), SLOT(streamDestroyed()));
107 connect(sender: m_stream, SIGNAL(readyRead()), receiver: this, SLOT(onDataReady()));
108 m_sequential = m_stream->isSequential();
109 }
110}
111
112QIODevice *QGstAppSrc::stream() const
113{
114 return m_stream;
115}
116
117GstAppSrc *QGstAppSrc::element()
118{
119 return m_appSrc;
120}
121
122void QGstAppSrc::onDataReady()
123{
124 if (!m_enoughData) {
125 m_dataRequested = true;
126 pushDataToAppSrc();
127 }
128}
129
130void QGstAppSrc::streamDestroyed()
131{
132 if (sender() == m_stream) {
133 m_stream = 0;
134 sendEOS();
135 }
136}
137
138void QGstAppSrc::pushDataToAppSrc()
139{
140 if (!isStreamValid() || !m_appSrc)
141 return;
142
143 if (m_dataRequested && !m_enoughData) {
144 qint64 size;
145 if (m_dataRequestSize == ~0u)
146 size = qMin(a: m_stream->bytesAvailable(), b: queueSize());
147 else
148 size = qMin(a: m_stream->bytesAvailable(), b: (qint64)m_dataRequestSize);
149
150 if (size) {
151 GstBuffer* buffer = gst_buffer_new_and_alloc(size);
152
153#if GST_CHECK_VERSION(1,0,0)
154 GstMapInfo mapInfo;
155 gst_buffer_map(buffer, info: &mapInfo, flags: GST_MAP_WRITE);
156 void* bufferData = mapInfo.data;
157#else
158 void* bufferData = GST_BUFFER_DATA(buffer);
159#endif
160
161 buffer->offset = m_stream->pos();
162 qint64 bytesRead = m_stream->read(data: (char*)bufferData, maxlen: size);
163 buffer->offset_end = buffer->offset + bytesRead - 1;
164
165#if GST_CHECK_VERSION(1,0,0)
166 gst_buffer_unmap(buffer, info: &mapInfo);
167#endif
168
169 if (bytesRead > 0) {
170 m_dataRequested = false;
171 m_enoughData = false;
172 GstFlowReturn ret = gst_app_src_push_buffer (GST_APP_SRC (element()), buffer);
173 if (ret == GST_FLOW_ERROR) {
174 qWarning()<<"appsrc: push buffer error";
175#if GST_CHECK_VERSION(1,0,0)
176 } else if (ret == GST_FLOW_FLUSHING) {
177 qWarning()<<"appsrc: push buffer wrong state";
178 }
179#else
180 } else if (ret == GST_FLOW_WRONG_STATE) {
181 qWarning()<<"appsrc: push buffer wrong state";
182 }
183#endif
184#if GST_VERSION_MAJOR < 1
185 else if (ret == GST_FLOW_RESEND) {
186 qWarning()<<"appsrc: push buffer resend";
187 }
188#endif
189 }
190 } else if (!m_sequential) {
191 sendEOS();
192 }
193 } else if (m_stream->atEnd() && !m_sequential) {
194 sendEOS();
195 }
196}
197
198bool QGstAppSrc::doSeek(qint64 value)
199{
200 if (isStreamValid())
201 return stream()->seek(pos: value);
202 return false;
203}
204
205
206gboolean QGstAppSrc::on_seek_data(GstAppSrc *element, guint64 arg0, gpointer userdata)
207{
208 Q_UNUSED(element);
209 QGstAppSrc *self = reinterpret_cast<QGstAppSrc*>(userdata);
210 if (self && self->isStreamValid()) {
211 if (!self->stream()->isSequential())
212 QMetaObject::invokeMethod(obj: self, member: "doSeek", type: Qt::AutoConnection, Q_ARG(qint64, arg0));
213 }
214 else
215 return false;
216
217 return true;
218}
219
220void QGstAppSrc::on_enough_data(GstAppSrc *element, gpointer userdata)
221{
222 Q_UNUSED(element);
223 QGstAppSrc *self = reinterpret_cast<QGstAppSrc*>(userdata);
224 if (self)
225 self->enoughData() = true;
226}
227
228void QGstAppSrc::on_need_data(GstAppSrc *element, guint arg0, gpointer userdata)
229{
230 Q_UNUSED(element);
231 QGstAppSrc *self = reinterpret_cast<QGstAppSrc*>(userdata);
232 if (self) {
233 self->dataRequested() = true;
234 self->enoughData() = false;
235 self->dataRequestSize()= arg0;
236 QMetaObject::invokeMethod(obj: self, member: "pushDataToAppSrc", type: Qt::AutoConnection);
237 }
238}
239
240void QGstAppSrc::destroy_notify(gpointer data)
241{
242 Q_UNUSED(data);
243}
244
245void QGstAppSrc::sendEOS()
246{
247 if (!m_appSrc)
248 return;
249
250 gst_app_src_end_of_stream(GST_APP_SRC(m_appSrc));
251 if (isStreamValid() && !stream()->isSequential())
252 stream()->reset();
253}
254

source code of qtmultimedia/src/gsttools/qgstappsrc.cpp