1 /* GStreamer
2 * Copyright (C) 2020 Collabora Ltd.
3 * Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21 #include "gstv4l2codecpool.h"
22
23 #include <string.h>
24
25 struct _GstV4l2CodecPool
26 {
27 GstBufferPool parent;
28 GstAtomicQueue *queue;
29 GstV4l2CodecAllocator *allocator;
30 /* Used to set GstVideoMeta */
31 GstVideoInfo *vinfo;
32 };
33
34 G_DEFINE_TYPE (GstV4l2CodecPool, gst_v4l2_codec_pool, GST_TYPE_BUFFER_POOL);
35
36 static GstBuffer *
gst_v4l2_codec_pool_create_empty_buffer(void)37 gst_v4l2_codec_pool_create_empty_buffer (void)
38 {
39 GstVideoMeta *vmeta;
40 GstBuffer *buffer = gst_buffer_new ();
41
42 vmeta = gst_buffer_add_video_meta (buffer, 0, GST_VIDEO_FORMAT_NV12, 1, 1);
43 GST_META_FLAG_SET (vmeta, GST_META_FLAG_POOLED);
44
45 return buffer;
46 }
47
48 static GstFlowReturn
gst_v4l2_codec_pool_acquire_buffer(GstBufferPool * pool,GstBuffer ** buffer,GstBufferPoolAcquireParams * params)49 gst_v4l2_codec_pool_acquire_buffer (GstBufferPool * pool, GstBuffer ** buffer,
50 GstBufferPoolAcquireParams * params)
51 {
52 GstV4l2CodecPool *self = GST_V4L2_CODEC_POOL (pool);
53 GstBuffer *buf;
54 GstVideoMeta *vmeta;
55
56 /* A GstVideoInfo must be set before buffer can be acquired */
57 g_return_val_if_fail (self->vinfo, GST_FLOW_ERROR);
58
59 buf = gst_atomic_queue_pop (self->queue);
60 if (!buf)
61 buf = gst_v4l2_codec_pool_create_empty_buffer ();
62
63 /* First, just try and obtain a buffer. */
64 if (!gst_v4l2_codec_allocator_prepare_buffer (self->allocator, buf)) {
65 GstFlowReturn flow_ret = GST_FLOW_OK;
66
67 /* If none were available, try and allocate one. */
68 if (!gst_v4l2_codec_allocator_create_buffer (self->allocator)) {
69 /* Otherwise, wait if this is allowed. */
70 if (params && params->flags & GST_BUFFER_POOL_ACQUIRE_FLAG_DONTWAIT) {
71 flow_ret = GST_FLOW_EOS;
72 } else {
73 if (!gst_v4l2_codec_allocator_wait_for_buffer (self->allocator))
74 flow_ret = GST_FLOW_FLUSHING;
75 }
76 }
77
78 if (flow_ret != GST_FLOW_OK) {
79 gst_atomic_queue_push (self->queue, buf);
80 return flow_ret;
81 }
82
83 /* Finally, pop the buffer we created or waited for. */
84 gst_v4l2_codec_allocator_prepare_buffer (self->allocator, buf);
85 }
86
87 vmeta = gst_buffer_get_video_meta (buf);
88 vmeta->format = GST_VIDEO_INFO_FORMAT (self->vinfo);
89 vmeta->width = GST_VIDEO_INFO_WIDTH (self->vinfo);
90 vmeta->height = GST_VIDEO_INFO_HEIGHT (self->vinfo);
91 vmeta->n_planes = GST_VIDEO_INFO_N_PLANES (self->vinfo);
92 memcpy (vmeta->offset, self->vinfo->offset, sizeof (vmeta->offset));
93 memcpy (vmeta->stride, self->vinfo->stride, sizeof (vmeta->stride));
94
95 *buffer = buf;
96 return GST_FLOW_OK;
97 }
98
99 static void
gst_v4l2_codec_pool_reset_buffer(GstBufferPool * pool,GstBuffer * buffer)100 gst_v4l2_codec_pool_reset_buffer (GstBufferPool * pool, GstBuffer * buffer)
101 {
102 GstBufferPoolClass *klass =
103 GST_BUFFER_POOL_CLASS (gst_v4l2_codec_pool_parent_class);
104
105 /* Clears all the memories and only pool the GstBuffer objects */
106 gst_buffer_remove_all_memory (buffer);
107 klass->reset_buffer (pool, buffer);
108 GST_BUFFER_FLAGS (buffer) = 0;
109 }
110
111 static void
gst_v4l2_codec_pool_release_buffer(GstBufferPool * pool,GstBuffer * buffer)112 gst_v4l2_codec_pool_release_buffer (GstBufferPool * pool, GstBuffer * buffer)
113 {
114 GstV4l2CodecPool *self = GST_V4L2_CODEC_POOL (pool);
115 gst_atomic_queue_push (self->queue, buffer);
116 }
117
118 static void
gst_v4l2_codec_pool_init(GstV4l2CodecPool * self)119 gst_v4l2_codec_pool_init (GstV4l2CodecPool * self)
120 {
121 self->queue = gst_atomic_queue_new (4);
122 }
123
124 static void
gst_v4l2_codec_pool_finalize(GObject * object)125 gst_v4l2_codec_pool_finalize (GObject * object)
126 {
127 GstV4l2CodecPool *self = GST_V4L2_CODEC_POOL (object);
128 GstBuffer *buf;
129
130 while ((buf = gst_atomic_queue_pop (self->queue)))
131 gst_buffer_unref (buf);
132
133 gst_atomic_queue_unref (self->queue);
134 g_object_unref (self->allocator);
135
136 if (self->vinfo)
137 gst_video_info_free (self->vinfo);
138
139 G_OBJECT_CLASS (gst_v4l2_codec_pool_parent_class)->finalize (object);
140 }
141
142 static void
gst_v4l2_codec_pool_class_init(GstV4l2CodecPoolClass * klass)143 gst_v4l2_codec_pool_class_init (GstV4l2CodecPoolClass * klass)
144 {
145 GObjectClass *object_class = G_OBJECT_CLASS (klass);
146 GstBufferPoolClass *pool_class = GST_BUFFER_POOL_CLASS (klass);
147
148 object_class->finalize = gst_v4l2_codec_pool_finalize;
149 pool_class->start = NULL;
150 pool_class->acquire_buffer = gst_v4l2_codec_pool_acquire_buffer;
151 pool_class->reset_buffer = gst_v4l2_codec_pool_reset_buffer;
152 pool_class->release_buffer = gst_v4l2_codec_pool_release_buffer;
153 }
154
155 GstV4l2CodecPool *
gst_v4l2_codec_pool_new(GstV4l2CodecAllocator * allocator,const GstVideoInfo * vinfo)156 gst_v4l2_codec_pool_new (GstV4l2CodecAllocator * allocator,
157 const GstVideoInfo * vinfo)
158 {
159 GstV4l2CodecPool *pool = g_object_new (GST_TYPE_V4L2_CODEC_POOL, NULL);
160 gsize pool_size;
161
162 pool->allocator = g_object_ref (allocator);
163 pool->vinfo = gst_video_info_copy (vinfo);
164
165 pool_size = gst_v4l2_codec_allocator_get_pool_size (allocator);
166 for (gsize i = 0; i < pool_size; i++) {
167 GstBuffer *buffer = gst_v4l2_codec_pool_create_empty_buffer ();
168 gst_atomic_queue_push (pool->queue, buffer);
169 }
170
171 return pool;
172 }
173
174 guint32
gst_v4l2_codec_buffer_get_index(GstBuffer * buffer)175 gst_v4l2_codec_buffer_get_index (GstBuffer * buffer)
176 {
177 GstMemory *mem = gst_buffer_peek_memory (buffer, 0);
178 return gst_v4l2_codec_memory_get_index (mem);
179 }
180