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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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179 lines
5.4 KiB
C
179 lines
5.4 KiB
C
/* GStreamer
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* Copyright (C) 2020 Collabora Ltd.
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* Author: Nicolas Dufresne <nicolas.dufresne@collabora.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 "gstv4l2codecpool.h"
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#include <string.h>
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struct _GstV4l2CodecPool
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{
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GstBufferPool parent;
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GstAtomicQueue *queue;
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GstV4l2CodecAllocator *allocator;
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/* Used to set GstVideoMeta */
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GstVideoInfo *vinfo;
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};
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G_DEFINE_TYPE (GstV4l2CodecPool, gst_v4l2_codec_pool, GST_TYPE_BUFFER_POOL);
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static GstBuffer *
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gst_v4l2_codec_pool_create_empty_buffer (void)
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{
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GstVideoMeta *vmeta;
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GstBuffer *buffer = gst_buffer_new ();
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vmeta = gst_buffer_add_video_meta (buffer, 0, GST_VIDEO_FORMAT_NV12, 1, 1);
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GST_META_FLAG_SET (vmeta, GST_META_FLAG_POOLED);
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return buffer;
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}
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static GstFlowReturn
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gst_v4l2_codec_pool_acquire_buffer (GstBufferPool * pool, GstBuffer ** buffer,
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GstBufferPoolAcquireParams * params)
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{
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GstV4l2CodecPool *self = GST_V4L2_CODEC_POOL (pool);
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GstBuffer *buf;
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GstVideoMeta *vmeta;
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/* A GstVideoInfo must be set before buffer can be acquired */
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g_return_val_if_fail (self->vinfo, GST_FLOW_ERROR);
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buf = gst_atomic_queue_pop (self->queue);
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if (!buf)
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buf = gst_v4l2_codec_pool_create_empty_buffer ();
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/* First, just try and obtain a buffer. */
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if (!gst_v4l2_codec_allocator_prepare_buffer (self->allocator, buf)) {
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GstFlowReturn flow_ret = GST_FLOW_OK;
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/* If none were available, try and allocate one. */
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if (!gst_v4l2_codec_allocator_create_buffer (self->allocator)) {
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/* Otherwise, wait if this is allowed. */
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if (params && params->flags & GST_BUFFER_POOL_ACQUIRE_FLAG_DONTWAIT) {
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flow_ret = GST_FLOW_EOS;
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} else {
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if (!gst_v4l2_codec_allocator_wait_for_buffer (self->allocator))
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flow_ret = GST_FLOW_FLUSHING;
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}
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}
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if (flow_ret != GST_FLOW_OK) {
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gst_atomic_queue_push (self->queue, buf);
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return flow_ret;
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}
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/* Finally, pop the buffer we created or waited for. */
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gst_v4l2_codec_allocator_prepare_buffer (self->allocator, buf);
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}
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vmeta = gst_buffer_get_video_meta (buf);
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vmeta->format = GST_VIDEO_INFO_FORMAT (self->vinfo);
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vmeta->width = GST_VIDEO_INFO_WIDTH (self->vinfo);
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vmeta->height = GST_VIDEO_INFO_HEIGHT (self->vinfo);
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vmeta->n_planes = GST_VIDEO_INFO_N_PLANES (self->vinfo);
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memcpy (vmeta->offset, self->vinfo->offset, sizeof (vmeta->offset));
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memcpy (vmeta->stride, self->vinfo->stride, sizeof (vmeta->stride));
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*buffer = buf;
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return GST_FLOW_OK;
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}
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static void
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gst_v4l2_codec_pool_reset_buffer (GstBufferPool * pool, GstBuffer * buffer)
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{
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GstBufferPoolClass *klass =
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GST_BUFFER_POOL_CLASS (gst_v4l2_codec_pool_parent_class);
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/* Clears all the memories and only pool the GstBuffer objects */
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gst_buffer_remove_all_memory (buffer);
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klass->reset_buffer (pool, buffer);
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GST_BUFFER_FLAGS (buffer) = 0;
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}
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static void
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gst_v4l2_codec_pool_release_buffer (GstBufferPool * pool, GstBuffer * buffer)
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{
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GstV4l2CodecPool *self = GST_V4L2_CODEC_POOL (pool);
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gst_atomic_queue_push (self->queue, buffer);
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}
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static void
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gst_v4l2_codec_pool_init (GstV4l2CodecPool * self)
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{
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self->queue = gst_atomic_queue_new (4);
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}
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static void
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gst_v4l2_codec_pool_finalize (GObject * object)
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{
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GstV4l2CodecPool *self = GST_V4L2_CODEC_POOL (object);
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GstBuffer *buf;
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while ((buf = gst_atomic_queue_pop (self->queue)))
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gst_buffer_unref (buf);
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gst_atomic_queue_unref (self->queue);
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g_object_unref (self->allocator);
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if (self->vinfo)
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gst_video_info_free (self->vinfo);
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G_OBJECT_CLASS (gst_v4l2_codec_pool_parent_class)->finalize (object);
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}
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static void
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gst_v4l2_codec_pool_class_init (GstV4l2CodecPoolClass * klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GstBufferPoolClass *pool_class = GST_BUFFER_POOL_CLASS (klass);
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object_class->finalize = gst_v4l2_codec_pool_finalize;
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pool_class->start = NULL;
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pool_class->acquire_buffer = gst_v4l2_codec_pool_acquire_buffer;
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pool_class->reset_buffer = gst_v4l2_codec_pool_reset_buffer;
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pool_class->release_buffer = gst_v4l2_codec_pool_release_buffer;
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}
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GstV4l2CodecPool *
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gst_v4l2_codec_pool_new (GstV4l2CodecAllocator * allocator,
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const GstVideoInfo * vinfo)
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{
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GstV4l2CodecPool *pool = g_object_new (GST_TYPE_V4L2_CODEC_POOL, NULL);
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gsize pool_size;
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pool->allocator = g_object_ref (allocator);
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pool->vinfo = gst_video_info_copy (vinfo);
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pool_size = gst_v4l2_codec_allocator_get_pool_size (allocator);
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for (gsize i = 0; i < pool_size; i++) {
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GstBuffer *buffer = gst_v4l2_codec_pool_create_empty_buffer ();
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gst_atomic_queue_push (pool->queue, buffer);
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}
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return pool;
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}
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guint32
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gst_v4l2_codec_buffer_get_index (GstBuffer * buffer)
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{
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GstMemory *mem = gst_buffer_peek_memory (buffer, 0);
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return gst_v4l2_codec_memory_get_index (mem);
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}
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