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Return a copy of the pool buffer if all mmap buffers have been dequeued.

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Original commit message from CVS:
(gst_v4l2src_grab_frame): Return a copy of the pool buffer if all
mmap buffers have been dequeued.
This commit is contained in:
Andy Wingo 2007-06-12 13:33:56 +00:00
parent cde8c8bdc4
commit 34d9fcc47f
2 changed files with 20 additions and 6 deletions
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2
ChangeLog
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@ -17,6 +17,8 @@
to allocate the pool, which also preallocates the GstBuffers. to allocate the pool, which also preallocates the GstBuffers.
(gst_v4l2src_capture_start): Call buffer_pool_activate instead of (gst_v4l2src_capture_start): Call buffer_pool_activate instead of
queueing the frames directly. queueing the frames directly.
(gst_v4l2src_grab_frame): Return a copy of the pool buffer if all
mmap buffers have been dequeued.
* sys/v4l2/gstv4l2src.h (struct _GstV4l2BufferPool): Make this a * sys/v4l2/gstv4l2src.h (struct _GstV4l2BufferPool): Make this a
real MiniObject instead of rolling our own refcounting and real MiniObject instead of rolling our own refcounting and

24
sys/v4l2/v4l2src_calls.c
View file

@ -667,6 +667,8 @@ gst_v4l2src_grab_frame (GstV4l2Src * v4l2src, GstBuffer ** buf)
#define NUM_TRIALS 50 #define NUM_TRIALS 50
struct v4l2_buffer buffer; struct v4l2_buffer buffer;
gint32 trials = NUM_TRIALS; gint32 trials = NUM_TRIALS;
GstBuffer *pool_buffer;
gboolean need_copy;
memset (&buffer, 0x00, sizeof (buffer)); memset (&buffer, 0x00, sizeof (buffer));
buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
@ -674,7 +676,7 @@ gst_v4l2src_grab_frame (GstV4l2Src * v4l2src, GstBuffer ** buf)
while (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_DQBUF, &buffer) < 0) { while (ioctl (v4l2src->v4l2object->video_fd, VIDIOC_DQBUF, &buffer) < 0) {
GST_LOG_OBJECT (v4l2src, GST_WARNING_OBJECT (v4l2src,
"problem grabbing frame %d (ix=%d), trials=%d, pool-ct=%d, buf.flags=%d", "problem grabbing frame %d (ix=%d), trials=%d, pool-ct=%d, buf.flags=%d",
buffer.sequence, buffer.index, trials, buffer.sequence, buffer.index, trials,
GST_MINI_OBJECT_REFCOUNT (v4l2src->pool), buffer.flags); GST_MINI_OBJECT_REFCOUNT (v4l2src->pool), buffer.flags);
@ -738,17 +740,19 @@ gst_v4l2src_grab_frame (GstV4l2Src * v4l2src, GstBuffer ** buf)
g_mutex_lock (v4l2src->pool->lock); g_mutex_lock (v4l2src->pool->lock);
*buf = GST_BUFFER (v4l2src->pool->buffers[buffer.index]); pool_buffer = GST_BUFFER (v4l2src->pool->buffers[buffer.index]);
v4l2src->pool->buffers[buffer.index] = NULL; v4l2src->pool->buffers[buffer.index] = NULL;
v4l2src->pool->num_live_buffers++; v4l2src->pool->num_live_buffers++;
need_copy = v4l2src->pool->num_live_buffers == v4l2src->pool->buffer_count;
g_mutex_unlock (v4l2src->pool->lock); g_mutex_unlock (v4l2src->pool->lock);
/* this can change at every frame, esp. with jpeg */ /* this can change at every frame, esp. with jpeg */
GST_BUFFER_SIZE (*buf) = buffer.bytesused; GST_BUFFER_SIZE (pool_buffer) = buffer.bytesused;
GST_BUFFER_OFFSET (*buf) = v4l2src->offset++; GST_BUFFER_OFFSET (pool_buffer) = v4l2src->offset++;
GST_BUFFER_OFFSET_END (*buf) = v4l2src->offset; GST_BUFFER_OFFSET_END (pool_buffer) = v4l2src->offset;
/* timestamps, LOCK to get clock and base time. */ /* timestamps, LOCK to get clock and base time. */
{ {
@ -773,7 +777,15 @@ gst_v4l2src_grab_frame (GstV4l2Src * v4l2src, GstBuffer ** buf)
} }
/* FIXME: use the timestamp from the buffer itself! */ /* FIXME: use the timestamp from the buffer itself! */
GST_BUFFER_TIMESTAMP (*buf) = timestamp; GST_BUFFER_TIMESTAMP (pool_buffer) = timestamp;
}
if (G_UNLIKELY (need_copy)) {
*buf = gst_buffer_copy (pool_buffer);
/* this will requeue */
gst_buffer_unref (pool_buffer);
} else {
*buf = pool_buffer;
} }
GST_LOG_OBJECT (v4l2src, "grabbed frame %d (ix=%d), pool-ct=%d", GST_LOG_OBJECT (v4l2src, "grabbed frame %d (ix=%d), pool-ct=%d",