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v4l2: various cleanups
Various cleanups, avoids useless casts, move error handling outside of the main code flow. Negotiate to a resonable resolution instead of the max resolution.
This commit is contained in:
Wim Taymans
parent
eb82a50bd1
commit
851f550003
5 changed files with 119 additions and 148 deletions
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@ -34,9 +34,7 @@
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#include <gstv4l2bufferpool.h>
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#include "gstv4l2src.h"
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#ifdef HAVE_EXPERIMENTAL
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#include "gstv4l2sink.h"
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#endif
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#include "v4l2_calls.h"
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#include "gst/gst-i18n-plugin.h"
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@ -194,12 +192,11 @@ mmap_failed:
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}
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}
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/*
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* GstV4l2BufferPool:
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*/
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static GObjectClass *buffer_pool_parent_class = NULL;
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#define gst_v4l2_buffer_pool_parent_class parent_class
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G_DEFINE_TYPE (GstV4l2BufferPool, gst_v4l2_buffer_pool, G_TYPE_OBJECT);
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static void
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gst_v4l2_buffer_pool_finalize (GObject * object)
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@ -220,11 +217,11 @@ gst_v4l2_buffer_pool_finalize (GObject * object)
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pool->buffers = NULL;
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}
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buffer_pool_parent_class->finalize (object);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_v4l2_buffer_pool_init (GstV4l2BufferPool * pool, gpointer g_class)
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gst_v4l2_buffer_pool_init (GstV4l2BufferPool * pool)
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{
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pool->lock = g_mutex_new ();
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pool->running = FALSE;
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@ -232,40 +229,13 @@ gst_v4l2_buffer_pool_init (GstV4l2BufferPool * pool, gpointer g_class)
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}
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static void
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gst_v4l2_buffer_pool_class_init (gpointer g_class, gpointer class_data)
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gst_v4l2_buffer_pool_class_init (GstV4l2BufferPoolClass * klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (g_class);
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buffer_pool_parent_class = g_type_class_peek_parent (g_class);
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->finalize = gst_v4l2_buffer_pool_finalize;
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}
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GType
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gst_v4l2_buffer_pool_get_type (void)
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{
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static GType _gst_v4l2_buffer_pool_type;
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if (G_UNLIKELY (_gst_v4l2_buffer_pool_type == 0)) {
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static const GTypeInfo v4l2_buffer_pool_info = {
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sizeof (GObjectClass),
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NULL,
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NULL,
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gst_v4l2_buffer_pool_class_init,
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NULL,
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NULL,
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sizeof (GstV4l2BufferPool),
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0,
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(GInstanceInitFunc) gst_v4l2_buffer_pool_init,
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NULL
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};
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_gst_v4l2_buffer_pool_type = g_type_register_static (G_TYPE_OBJECT,
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"GstV4l2BufferPool", &v4l2_buffer_pool_info, 0);
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}
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return _gst_v4l2_buffer_pool_type;
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}
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/* this is somewhat of a hack.. but better to keep the hack in
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* one place than copy/pasting it around..
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*/
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@ -275,18 +245,14 @@ get_v4l2_object (GstElement * v4l2elem)
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GstV4l2Object *v4l2object = NULL;
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if (GST_IS_V4L2SRC (v4l2elem)) {
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v4l2object = (GST_V4L2SRC (v4l2elem))->v4l2object;
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#ifdef HAVE_EXPERIMENTAL
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} else if (GST_IS_V4L2SINK (v4l2elem)) {
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v4l2object = (GST_V4L2SINK (v4l2elem))->v4l2object;
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#endif
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} else {
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GST_ERROR_OBJECT (v4l2elem, "unknown v4l2 element");
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}
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return v4l2object;
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}
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/**
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* gst_v4l2_buffer_pool_new:
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* @v4l2elem: the v4l2 element (src or sink) that owns this pool
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@ -316,7 +282,6 @@ gst_v4l2_buffer_pool_new (GstElement * v4l2elem, gint fd, gint num_buffers,
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if (pool->video_fd < 0)
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goto dup_failed;
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/* first, lets request buffers, and see how many we can get: */
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GST_DEBUG_OBJECT (v4l2elem, "STREAMING, requesting %d MMAP buffers",
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num_buffers);
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@ -428,7 +393,7 @@ gst_v4l2_buffer_pool_destroy (GstV4l2BufferPool * pool)
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GstBuffer *buf;
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GST_V4L2_BUFFER_POOL_LOCK (pool);
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buf = GST_BUFFER (pool->buffers[n]);
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buf = pool->buffers[n];
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GST_V4L2_BUFFER_POOL_UNLOCK (pool);
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if (buf)
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@ -493,13 +458,20 @@ gst_v4l2_buffer_pool_qbuf (GstV4l2BufferPool * pool, GstBuffer * buf)
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meta->vbuffer.index);
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if (v4l2_ioctl (pool->video_fd, VIDIOC_QBUF, &meta->vbuffer) < 0)
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return FALSE;
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goto queue_failed;
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pool->num_live_buffers--;
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GST_DEBUG_OBJECT (pool->v4l2elem, "num_live_buffers--: %d",
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pool->num_live_buffers);
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return TRUE;
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/* ERRORS */
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queue_failed:
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{
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GST_WARNING_OBJECT (pool->v4l2elem, "could not queue a buffer");
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return FALSE;
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}
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}
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/**
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@ -523,97 +495,100 @@ gst_v4l2_buffer_pool_dqbuf (GstV4l2BufferPool * pool)
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buffer.type = pool->type;
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buffer.memory = V4L2_MEMORY_MMAP;
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if (v4l2_ioctl (pool->video_fd, VIDIOC_DQBUF, &buffer) >= 0) {
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if (v4l2_ioctl (pool->video_fd, VIDIOC_DQBUF, &buffer) < 0)
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goto error;
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GST_V4L2_BUFFER_POOL_LOCK (pool);
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GST_V4L2_BUFFER_POOL_LOCK (pool);
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/* get our GstBuffer with that index from the pool, if the buffer was
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* outstanding we have a serious problem.
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*/
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pool_buffer = pool->buffers[buffer.index];
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/* get our GstBuffer with that index from the pool, if the buffer was
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* outstanding we have a serious problem.
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*/
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pool_buffer = pool->buffers[buffer.index];
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if (pool_buffer == NULL) {
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GST_ELEMENT_ERROR (pool->v4l2elem, RESOURCE, FAILED,
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(_("Failed trying to get video frames from device '%s'."),
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v4l2object->videodev),
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(_("No free buffers found in the pool at index %d."), buffer.index));
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GST_V4L2_BUFFER_POOL_UNLOCK (pool);
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return NULL;
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if (pool_buffer == NULL)
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goto no_buffers;
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GST_LOG_OBJECT (pool->v4l2elem,
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"grabbed frame %d (ix=%d), flags %08x, pool-ct=%d, buffer=%p",
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buffer.sequence, buffer.index, buffer.flags, pool->num_live_buffers,
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pool_buffer);
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pool->num_live_buffers++;
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GST_DEBUG_OBJECT (pool->v4l2elem, "num_live_buffers++: %d",
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pool->num_live_buffers);
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/* set top/bottom field first if v4l2_buffer has the information */
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if (buffer.field == V4L2_FIELD_INTERLACED_TB)
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GST_BUFFER_FLAG_SET (pool_buffer, GST_VIDEO_BUFFER_TFF);
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if (buffer.field == V4L2_FIELD_INTERLACED_BT)
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GST_BUFFER_FLAG_UNSET (pool_buffer, GST_VIDEO_BUFFER_TFF);
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/* this can change at every frame, esp. with jpeg */
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gst_buffer_resize (pool_buffer, 0, buffer.bytesused);
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GST_V4L2_BUFFER_POOL_UNLOCK (pool);
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return pool_buffer;
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/* ERRORS */
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error:
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{
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GST_WARNING_OBJECT (pool->v4l2elem,
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"problem grabbing frame %d (ix=%d), pool-ct=%d, buf.flags=%d",
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buffer.sequence, buffer.index,
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GST_MINI_OBJECT_REFCOUNT (pool), buffer.flags);
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switch (errno) {
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case EAGAIN:
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GST_WARNING_OBJECT (pool->v4l2elem,
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"Non-blocking I/O has been selected using O_NONBLOCK and"
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" no buffer was in the outgoing queue. device %s",
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v4l2object->videodev);
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break;
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case EINVAL:
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GST_ELEMENT_ERROR (pool->v4l2elem, RESOURCE, FAILED,
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(_("Failed trying to get video frames from device '%s'."),
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v4l2object->videodev),
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(_("The buffer type is not supported, or the index is out of bounds," " or no buffers have been allocated yet, or the userptr" " or length are invalid. device %s"), v4l2object->videodev));
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break;
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case ENOMEM:
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GST_ELEMENT_ERROR (pool->v4l2elem, RESOURCE, FAILED,
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(_("Failed trying to get video frames from device '%s'. Not enough memory."), v4l2object->videodev), (_("insufficient memory to enqueue a user pointer buffer. device %s."), v4l2object->videodev));
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break;
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case EIO:
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GST_INFO_OBJECT (pool->v4l2elem,
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"VIDIOC_DQBUF failed due to an internal error."
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" Can also indicate temporary problems like signal loss."
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" Note the driver might dequeue an (empty) buffer despite"
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" returning an error, or even stop capturing."
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" device %s", v4l2object->videodev);
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/* have we de-queued a buffer ? */
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if (!(buffer.flags & (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE))) {
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GST_DEBUG_OBJECT (pool->v4l2elem, "reenqueing buffer");
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/* FIXME ... should we do something here? */
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}
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break;
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case EINTR:
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GST_WARNING_OBJECT (pool->v4l2elem,
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"could not sync on a buffer on device %s", v4l2object->videodev);
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break;
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default:
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GST_WARNING_OBJECT (pool->v4l2elem,
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"Grabbing frame got interrupted on %s unexpectedly. %d: %s.",
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v4l2object->videodev, errno, g_strerror (errno));
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break;
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}
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GST_LOG_OBJECT (pool->v4l2elem,
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"grabbed frame %d (ix=%d), flags %08x, pool-ct=%d, buffer=%p",
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buffer.sequence, buffer.index, buffer.flags, pool->num_live_buffers,
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pool_buffer);
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pool->num_live_buffers++;
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GST_DEBUG_OBJECT (pool->v4l2elem, "num_live_buffers++: %d",
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pool->num_live_buffers);
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/* set top/bottom field first if v4l2_buffer has the information */
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if (buffer.field == V4L2_FIELD_INTERLACED_TB)
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GST_BUFFER_FLAG_SET (pool_buffer, GST_VIDEO_BUFFER_TFF);
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if (buffer.field == V4L2_FIELD_INTERLACED_BT)
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GST_BUFFER_FLAG_UNSET (pool_buffer, GST_VIDEO_BUFFER_TFF);
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/* this can change at every frame, esp. with jpeg */
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gst_buffer_resize (pool_buffer, 0, buffer.bytesused);
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return NULL;
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}
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no_buffers:
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{
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GST_ELEMENT_ERROR (pool->v4l2elem, RESOURCE, FAILED,
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(_("Failed trying to get video frames from device '%s'."),
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v4l2object->videodev),
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(_("No free buffers found in the pool at index %d."), buffer.index));
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GST_V4L2_BUFFER_POOL_UNLOCK (pool);
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return pool_buffer;
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return NULL;
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}
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GST_WARNING_OBJECT (pool->v4l2elem,
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"problem grabbing frame %d (ix=%d), pool-ct=%d, buf.flags=%d",
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buffer.sequence, buffer.index,
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GST_MINI_OBJECT_REFCOUNT (pool), buffer.flags);
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switch (errno) {
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case EAGAIN:
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GST_WARNING_OBJECT (pool->v4l2elem,
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"Non-blocking I/O has been selected using O_NONBLOCK and"
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" no buffer was in the outgoing queue. device %s",
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v4l2object->videodev);
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break;
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case EINVAL:
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GST_ELEMENT_ERROR (pool->v4l2elem, RESOURCE, FAILED,
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(_("Failed trying to get video frames from device '%s'."),
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v4l2object->videodev),
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(_("The buffer type is not supported, or the index is out of bounds,"
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" or no buffers have been allocated yet, or the userptr"
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" or length are invalid. device %s"), v4l2object->videodev));
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break;
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case ENOMEM:
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GST_ELEMENT_ERROR (pool->v4l2elem, RESOURCE, FAILED,
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(_("Failed trying to get video frames from device '%s'. Not enough memory."), v4l2object->videodev), (_("insufficient memory to enqueue a user pointer buffer. device %s."), v4l2object->videodev));
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break;
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case EIO:
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GST_INFO_OBJECT (pool->v4l2elem,
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"VIDIOC_DQBUF failed due to an internal error."
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" Can also indicate temporary problems like signal loss."
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" Note the driver might dequeue an (empty) buffer despite"
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" returning an error, or even stop capturing."
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" device %s", v4l2object->videodev);
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/* have we de-queued a buffer ? */
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if (!(buffer.flags & (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE))) {
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GST_DEBUG_OBJECT (pool->v4l2elem, "reenqueing buffer");
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/* FIXME ... should we do something here? */
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}
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break;
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case EINTR:
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GST_WARNING_OBJECT (pool->v4l2elem,
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"could not sync on a buffer on device %s", v4l2object->videodev);
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break;
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default:
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GST_WARNING_OBJECT (pool->v4l2elem,
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"Grabbing frame got interrupted on %s unexpectedly. %d: %s.",
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v4l2object->videodev, errno, g_strerror (errno));
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break;
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}
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return NULL;
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}
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/**
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@ -39,6 +39,7 @@ GType gst_v4l2_buffer_pool_get_type (void);
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#define GST_V4L2_BUFFER_POOL(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_V4L2_BUFFER_POOL, GstV4l2BufferPool))
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typedef struct _GstV4l2BufferPool GstV4l2BufferPool;
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typedef struct _GstV4l2BufferPoolClass GstV4l2BufferPoolClass;
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typedef struct _GstMetaV4l2 GstMetaV4l2;
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@ -59,6 +60,11 @@ struct _GstV4l2BufferPool
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GstBuffer **buffers;
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};
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struct _GstV4l2BufferPoolClass
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{
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GObjectClass parent_class;
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};
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struct _GstMetaV4l2 {
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GstMeta meta;
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@ -733,7 +733,7 @@ gst_v4l2sink_buffer_alloc (GstBaseSink * bsink, guint64 offset, guint size,
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if (G_LIKELY (v4l2buf)) {
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GST_DEBUG_OBJECT (v4l2sink, "allocated buffer: %p", v4l2buf);
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*buf = GST_BUFFER (v4l2buf);
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*buf = v4l2buf;
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return GST_FLOW_OK;
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} else {
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GST_DEBUG_OBJECT (v4l2sink, "failed to allocate buffer");
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@ -834,7 +834,7 @@ gst_v4l2sink_show_frame (GstBaseSink * bsink, GstBuffer * buf)
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* to the pool of available buffers.. and if not, we keep looping.
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*/
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if (v4l2buf) {
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gst_buffer_unref (GST_BUFFER (v4l2buf));
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gst_buffer_unref (v4l2buf);
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}
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}
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@ -181,8 +181,8 @@ gst_v4l2src_class_init (GstV4l2SrcClass * klass)
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gst_element_class_set_details_simple (element_class,
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"Video (video4linux2) Source", "Source/Video",
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"Reads frames from a Video4Linux2 device",
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"Edgard Lima <edgard.lima@indt.org.br>,"
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" Stefan Kost <ensonic@users.sf.net>");
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"Edgard Lima <edgard.lima@indt.org.br>, "
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"Stefan Kost <ensonic@users.sf.net>");
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gst_element_class_add_pad_template
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(element_class,
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@ -277,7 +277,6 @@ gst_v4l2src_set_property (GObject * object,
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}
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}
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static void
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gst_v4l2src_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec)
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@ -303,7 +302,6 @@ gst_v4l2src_get_property (GObject * object,
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}
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}
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/* this function is a bit of a last resort */
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static void
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gst_v4l2src_fixate (GstBaseSrc * basesrc, GstCaps * caps)
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@ -318,14 +316,10 @@ gst_v4l2src_fixate (GstBaseSrc * basesrc, GstCaps * caps)
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structure = gst_caps_get_structure (caps, i);
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/* FIXME such sizes? we usually fixate to something in the 320x200
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* range... */
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/* We are fixating to greater possble size (limited to GST_V4L2_MAX_SIZE)
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/* We are fixating to a resonable 320x200 resolution
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and the maximum framerate resolution for that size */
|
||||
gst_structure_fixate_field_nearest_int (structure, "width",
|
||||
GST_V4L2_MAX_SIZE);
|
||||
gst_structure_fixate_field_nearest_int (structure, "height",
|
||||
GST_V4L2_MAX_SIZE);
|
||||
gst_structure_fixate_field_nearest_int (structure, "width", 320);
|
||||
gst_structure_fixate_field_nearest_int (structure, "height", 200);
|
||||
gst_structure_fixate_field_nearest_fraction (structure, "framerate",
|
||||
G_MAXINT, 1);
|
||||
|
||||
|
|
@ -394,11 +388,8 @@ gst_v4l2src_negotiate (GstBaseSrc * basesrc)
|
|||
* resolution strictly bigger then the first peer caps */
|
||||
if (gst_caps_get_size (icaps) > 1) {
|
||||
GstStructure *s = gst_caps_get_structure (peercaps, 0);
|
||||
|
||||
int best = 0;
|
||||
|
||||
int twidth, theight;
|
||||
|
||||
int width = G_MAXINT, height = G_MAXINT;
|
||||
|
||||
if (gst_structure_get_int (s, "width", &twidth)
|
||||
|
|
@ -409,7 +400,6 @@ gst_v4l2src_negotiate (GstBaseSrc * basesrc)
|
|||
*/
|
||||
for (i = gst_caps_get_size (icaps) - 1; i >= 0; i--) {
|
||||
GstStructure *is = gst_caps_get_structure (icaps, i);
|
||||
|
||||
int w, h;
|
||||
|
||||
if (gst_structure_get_int (is, "width", &w)
|
||||
|
|
@ -493,7 +483,6 @@ gst_v4l2src_get_caps (GstBaseSrc * src, GstCaps * filter)
|
|||
|
||||
for (walk = formats; walk; walk = walk->next) {
|
||||
struct v4l2_fmtdesc *format;
|
||||
|
||||
GstStructure *template;
|
||||
|
||||
format = (struct v4l2_fmtdesc *) walk->data;
|
||||
|
|
@ -868,6 +857,7 @@ gst_v4l2src_create (GstPushSrc * src, GstBuffer ** buf)
|
|||
if (v4l2src->get_frame == NULL)
|
||||
goto not_negotiated;
|
||||
|
||||
/* decimate, just capture and throw away frames */
|
||||
for (i = 0; i < v4l2src->decimate - 1; i++) {
|
||||
ret = v4l2src->get_frame (v4l2src, buf);
|
||||
if (ret != GST_FLOW_OK) {
|
||||
|
|
|
|||
|
|
@ -127,7 +127,7 @@ gst_v4l2src_grab_frame (GstV4l2Src * v4l2src, GstBuffer ** buf)
|
|||
}
|
||||
}
|
||||
|
||||
pool_buffer = GST_BUFFER (gst_v4l2_buffer_pool_dqbuf (pool));
|
||||
pool_buffer = gst_v4l2_buffer_pool_dqbuf (pool);
|
||||
if (pool_buffer)
|
||||
break;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue