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v4l2codecs: pool: Create new buffer when pool is empty

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This simply create an empty GstBuffer when the pool is empty. This way it's up
to the allocator to grow or wait if we ran out of memory.
This commit is contained in:
Nicolas Dufresne 2020-03-18 17:03:51 -04:00
parent ee26c9c9a1
commit bc0a8ff40d
1 changed files with 19 additions and 9 deletions
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28
sys/v4l2codecs/gstv4l2codecpool.c
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@ -33,22 +33,37 @@ struct _GstV4l2CodecPool
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 = gst_atomic_queue_pop (self->queue);
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)
return GST_FLOW_ERROR;
buf = gst_v4l2_codec_pool_create_empty_buffer ();
if (!gst_v4l2_codec_allocator_prepare_buffer (self->allocator, buf))
if (!gst_v4l2_codec_allocator_prepare_buffer (self->allocator, buf)) {
gst_atomic_queue_push (self->queue, buf);
return GST_FLOW_ERROR;
}
vmeta = gst_buffer_get_video_meta (buf);
vmeta->format = GST_VIDEO_INFO_FORMAT (self->vinfo);
@ -130,12 +145,7 @@ gst_v4l2_codec_pool_new (GstV4l2CodecAllocator * allocator,
pool_size = gst_v4l2_codec_allocator_get_pool_size (allocator);
for (gsize i = 0; i < pool_size; i++) {
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);
GstBuffer *buffer = gst_v4l2_codec_pool_create_empty_buffer ();
gst_atomic_queue_push (pool->queue, buffer);
}