gstreamer/subprojects/gst-plugins-bad/sys/v4l2codecs/gstv4l2codecpool.c

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/* GStreamer
* Copyright (C) 2020 Collabora Ltd.
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "gstv4l2codecpool.h"
#include <string.h>
struct _GstV4l2CodecPool
{
GstBufferPool parent;
GstAtomicQueue *queue;
GstV4l2CodecAllocator *allocator;
/* Used to set GstVideoMeta */
GstVideoInfo *vinfo;
};
G_DEFINE_TYPE (GstV4l2CodecPool, gst_v4l2_codec_pool, GST_TYPE_BUFFER_POOL);
static GstBuffer *
gst_v4l2_codec_pool_create_empty_buffer (void)
{
GstVideoMeta *vmeta;
GstBuffer *buffer = gst_buffer_new ();
vmeta = gst_buffer_add_video_meta (buffer, 0, GST_VIDEO_FORMAT_NV12, 1, 1);
GST_META_FLAG_SET (vmeta, GST_META_FLAG_POOLED);
return buffer;
}
static GstFlowReturn
gst_v4l2_codec_pool_acquire_buffer (GstBufferPool * pool, GstBuffer ** buffer,
GstBufferPoolAcquireParams * params)
{
GstV4l2CodecPool *self = GST_V4L2_CODEC_POOL (pool);
GstBuffer *buf;
GstVideoMeta *vmeta;
/* A GstVideoInfo must be set before buffer can be acquired */
g_return_val_if_fail (self->vinfo, GST_FLOW_ERROR);
buf = gst_atomic_queue_pop (self->queue);
if (!buf)
buf = gst_v4l2_codec_pool_create_empty_buffer ();
/* First, just try and obtain a buffer. */
if (!gst_v4l2_codec_allocator_prepare_buffer (self->allocator, buf)) {
GstFlowReturn flow_ret = GST_FLOW_OK;
/* If none were available, try and allocate one. */
if (!gst_v4l2_codec_allocator_create_buffer (self->allocator)) {
/* Otherwise, wait if this is allowed. */
if (params && params->flags & GST_BUFFER_POOL_ACQUIRE_FLAG_DONTWAIT) {
flow_ret = GST_FLOW_EOS;
} else {
if (!gst_v4l2_codec_allocator_wait_for_buffer (self->allocator))
flow_ret = GST_FLOW_FLUSHING;
}
}
if (flow_ret != GST_FLOW_OK) {
gst_atomic_queue_push (self->queue, buf);
return flow_ret;
}
/* Finally, pop the buffer we created or waited for. */
gst_v4l2_codec_allocator_prepare_buffer (self->allocator, buf);
}
vmeta = gst_buffer_get_video_meta (buf);
vmeta->format = GST_VIDEO_INFO_FORMAT (self->vinfo);
vmeta->width = GST_VIDEO_INFO_WIDTH (self->vinfo);
vmeta->height = GST_VIDEO_INFO_HEIGHT (self->vinfo);
vmeta->n_planes = GST_VIDEO_INFO_N_PLANES (self->vinfo);
memcpy (vmeta->offset, self->vinfo->offset, sizeof (vmeta->offset));
memcpy (vmeta->stride, self->vinfo->stride, sizeof (vmeta->stride));
*buffer = buf;
return GST_FLOW_OK;
}
static void
gst_v4l2_codec_pool_reset_buffer (GstBufferPool * pool, GstBuffer * buffer)
{
GstBufferPoolClass *klass =
GST_BUFFER_POOL_CLASS (gst_v4l2_codec_pool_parent_class);
/* Clears all the memories and only pool the GstBuffer objects */
gst_buffer_remove_all_memory (buffer);
klass->reset_buffer (pool, buffer);
GST_BUFFER_FLAGS (buffer) = 0;
}
static void
gst_v4l2_codec_pool_release_buffer (GstBufferPool * pool, GstBuffer * buffer)
{
GstV4l2CodecPool *self = GST_V4L2_CODEC_POOL (pool);
gst_atomic_queue_push (self->queue, buffer);
}
static void
gst_v4l2_codec_pool_init (GstV4l2CodecPool * self)
{
self->queue = gst_atomic_queue_new (4);
}
static void
gst_v4l2_codec_pool_finalize (GObject * object)
{
GstV4l2CodecPool *self = GST_V4L2_CODEC_POOL (object);
GstBuffer *buf;
while ((buf = gst_atomic_queue_pop (self->queue)))
gst_buffer_unref (buf);
gst_atomic_queue_unref (self->queue);
g_object_unref (self->allocator);
if (self->vinfo)
gst_video_info_free (self->vinfo);
G_OBJECT_CLASS (gst_v4l2_codec_pool_parent_class)->finalize (object);
}
static void
gst_v4l2_codec_pool_class_init (GstV4l2CodecPoolClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GstBufferPoolClass *pool_class = GST_BUFFER_POOL_CLASS (klass);
object_class->finalize = gst_v4l2_codec_pool_finalize;
pool_class->start = NULL;
pool_class->acquire_buffer = gst_v4l2_codec_pool_acquire_buffer;
pool_class->reset_buffer = gst_v4l2_codec_pool_reset_buffer;
pool_class->release_buffer = gst_v4l2_codec_pool_release_buffer;
}
GstV4l2CodecPool *
gst_v4l2_codec_pool_new (GstV4l2CodecAllocator * allocator,
const GstVideoInfo * vinfo)
{
GstV4l2CodecPool *pool = g_object_new (GST_TYPE_V4L2_CODEC_POOL, NULL);
gsize pool_size;
pool->allocator = g_object_ref (allocator);
pool->vinfo = gst_video_info_copy (vinfo);
pool_size = gst_v4l2_codec_allocator_get_pool_size (allocator);
for (gsize i = 0; i < pool_size; i++) {
GstBuffer *buffer = gst_v4l2_codec_pool_create_empty_buffer ();
gst_atomic_queue_push (pool->queue, buffer);
}
return pool;
}
guint32
gst_v4l2_codec_buffer_get_index (GstBuffer * buffer)
{
GstMemory *mem = gst_buffer_peek_memory (buffer, 0);
return gst_v4l2_codec_memory_get_index (mem);
}