#include <unistd.h>
#include "gst/video/video.h"
+#include "gst/video/gstmetavideo.h"
#include <gstv4l2bufferpool.h>
+
#include "gstv4l2src.h"
-#ifdef HAVE_EXPERIMENTAL
#include "gstv4l2sink.h"
-#endif
#include "v4l2_calls.h"
#include "gst/gst-i18n-plugin.h"
return meta_info;
}
+/*
+ * GstV4l2BufferPool:
+ */
+#define gst_v4l2_buffer_pool_parent_class parent_class
+G_DEFINE_TYPE (GstV4l2BufferPool, gst_v4l2_buffer_pool, GST_TYPE_BUFFER_POOL);
+
static void
-gst_v4l2_buffer_dispose (GstBuffer * buffer)
+gst_v4l2_buffer_pool_free_buffer (GstBufferPool * bpool, GstBuffer * buffer)
{
- GstV4l2BufferPool *pool;
- gboolean resuscitated = FALSE;
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
gint index;
GstMetaV4l2 *meta;
+ GstV4l2Object *obj;
meta = GST_META_V4L2_GET (buffer);
g_assert (meta != NULL);
- pool = meta->pool;
- index = meta->vbuffer.index;
-
- GST_LOG_OBJECT (pool->v4l2elem, "finalizing buffer %p %d", buffer, index);
-
- GST_V4L2_BUFFER_POOL_LOCK (pool);
- if (pool->running) {
- if (pool->requeuebuf) {
- if (!gst_v4l2_buffer_pool_qbuf (pool, buffer)) {
- GST_WARNING ("could not requeue buffer %p %d", buffer, index);
- } else {
- resuscitated = TRUE;
- }
- } else {
- resuscitated = TRUE;
- /* XXX double check this... I think it is ok to not synchronize this
- * w.r.t. destruction of the pool, since the buffer is still live and
- * the buffer holds a ref to the pool..
- */
- g_async_queue_push (pool->avail_buffers, buffer);
- }
- } else {
- GST_LOG_OBJECT (pool->v4l2elem, "the pool is shutting down");
- }
-
- if (resuscitated) {
- /* FIXME: check that the caps didn't change */
- GST_LOG_OBJECT (pool->v4l2elem, "reviving buffer %p, %d", buffer, index);
- gst_buffer_ref (buffer);
- pool->buffers[index] = buffer;
- }
+ obj = pool->obj;
- GST_V4L2_BUFFER_POOL_UNLOCK (pool);
+ index = meta->vbuffer.index;
+ GST_LOG_OBJECT (pool, "finalizing buffer %p %d", buffer, index);
+ pool->buffers[index] = NULL;
- if (!resuscitated) {
- GST_LOG_OBJECT (pool->v4l2elem,
- "buffer %p (data %p, len %u) not recovered, unmapping",
- buffer, meta->mem, meta->vbuffer.length);
- v4l2_munmap (meta->mem, meta->vbuffer.length);
+ GST_LOG_OBJECT (pool,
+ "buffer %p (data %p, len %u) freed, unmapping",
+ buffer, meta->mem, meta->vbuffer.length);
+ v4l2_munmap (meta->mem, meta->vbuffer.length);
- g_object_unref (pool);
- }
+ gst_buffer_unref (buffer);
}
-static GstBuffer *
-gst_v4l2_buffer_new (GstV4l2BufferPool * pool, guint index, GstCaps * caps)
+static GstFlowReturn
+gst_v4l2_buffer_pool_alloc_buffer (GstBufferPool * bpool, GstBuffer ** buffer,
+ GstBufferPoolParams * params)
{
- GstBuffer *ret;
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
+ GstBuffer *newbuf;
GstMetaV4l2 *meta;
+ GstV4l2Object *obj;
+ GstVideoInfo *info;
+ guint index;
- ret = gst_buffer_new ();
- GST_MINI_OBJECT_CAST (ret)->dispose =
- (GstMiniObjectDisposeFunction) gst_v4l2_buffer_dispose;
+ obj = pool->obj;
+ info = &obj->info;
- meta = GST_META_V4L2_ADD (ret);
+ newbuf = gst_buffer_new ();
+ meta = GST_META_V4L2_ADD (newbuf);
- GST_LOG_OBJECT (pool->v4l2elem, "creating buffer %u, %p in pool %p", index,
- ret, pool);
+ index = pool->index;
- meta->pool = (GstV4l2BufferPool *) g_object_ref (pool);
+ GST_LOG_OBJECT (pool, "creating buffer %u, %p", index, newbuf, pool);
meta->vbuffer.index = index;
- meta->vbuffer.type = pool->type;
+ meta->vbuffer.type = obj->type;
meta->vbuffer.memory = V4L2_MEMORY_MMAP;
if (v4l2_ioctl (pool->video_fd, VIDIOC_QUERYBUF, &meta->vbuffer) < 0)
goto querybuf_failed;
- GST_LOG_OBJECT (pool->v4l2elem, " index: %u", meta->vbuffer.index);
- GST_LOG_OBJECT (pool->v4l2elem, " type: %d", meta->vbuffer.type);
- GST_LOG_OBJECT (pool->v4l2elem, " bytesused: %u", meta->vbuffer.bytesused);
- GST_LOG_OBJECT (pool->v4l2elem, " flags: %08x", meta->vbuffer.flags);
- GST_LOG_OBJECT (pool->v4l2elem, " field: %d", meta->vbuffer.field);
- GST_LOG_OBJECT (pool->v4l2elem, " memory: %d", meta->vbuffer.memory);
+ GST_LOG_OBJECT (pool, " index: %u", meta->vbuffer.index);
+ GST_LOG_OBJECT (pool, " type: %d", meta->vbuffer.type);
+ GST_LOG_OBJECT (pool, " bytesused: %u", meta->vbuffer.bytesused);
+ GST_LOG_OBJECT (pool, " flags: %08x", meta->vbuffer.flags);
+ GST_LOG_OBJECT (pool, " field: %d", meta->vbuffer.field);
+ GST_LOG_OBJECT (pool, " memory: %d", meta->vbuffer.memory);
if (meta->vbuffer.memory == V4L2_MEMORY_MMAP)
- GST_LOG_OBJECT (pool->v4l2elem, " MMAP offset: %u",
- meta->vbuffer.m.offset);
- GST_LOG_OBJECT (pool->v4l2elem, " length: %u", meta->vbuffer.length);
- GST_LOG_OBJECT (pool->v4l2elem, " input: %u", meta->vbuffer.input);
+ GST_LOG_OBJECT (pool, " MMAP offset: %u", meta->vbuffer.m.offset);
+ GST_LOG_OBJECT (pool, " length: %u", meta->vbuffer.length);
+ GST_LOG_OBJECT (pool, " input: %u", meta->vbuffer.input);
meta->mem = v4l2_mmap (0, meta->vbuffer.length,
PROT_READ | PROT_WRITE, MAP_SHARED, pool->video_fd,
if (meta->mem == MAP_FAILED)
goto mmap_failed;
- gst_buffer_take_memory (ret, -1,
- gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY,
+ gst_buffer_take_memory (newbuf, -1,
+ gst_memory_new_wrapped (0,
meta->mem, NULL, meta->vbuffer.length, 0, meta->vbuffer.length));
- return ret;
+ /* add metadata to raw video buffers */
+ if (info->finfo) {
+ gsize offset[GST_VIDEO_MAX_PLANES];
+ gint stride[GST_VIDEO_MAX_PLANES];
+
+ offset[0] = 0;
+ stride[0] = obj->bytesperline;
+
+ GST_DEBUG_OBJECT (pool, "adding video meta");
+ gst_buffer_add_meta_video_full (newbuf, info->flags,
+ GST_VIDEO_INFO_FORMAT (info), GST_VIDEO_INFO_WIDTH (info),
+ GST_VIDEO_INFO_HEIGHT (info), GST_VIDEO_INFO_N_PLANES (info),
+ offset, stride);
+ }
+
+ pool->index++;
+
+ *buffer = newbuf;
+
+ return GST_FLOW_OK;
/* ERRORS */
querybuf_failed:
gint errnosave = errno;
GST_WARNING ("Failed QUERYBUF: %s", g_strerror (errnosave));
- gst_buffer_unref (ret);
+ gst_buffer_unref (newbuf);
errno = errnosave;
- return NULL;
+ return GST_FLOW_ERROR;
}
mmap_failed:
{
gint errnosave = errno;
GST_WARNING ("Failed to mmap: %s", g_strerror (errnosave));
- gst_buffer_unref (ret);
+ gst_buffer_unref (newbuf);
errno = errnosave;
- return NULL;
+ return GST_FLOW_ERROR;
}
}
-
-/*
- * GstV4l2BufferPool:
- */
-
-static GObjectClass *buffer_pool_parent_class = NULL;
-
-static void
-gst_v4l2_buffer_pool_finalize (GObject * object)
+static gboolean
+gst_v4l2_buffer_pool_set_config (GstBufferPool * bpool, GstStructure * config)
{
- GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (object);
-
- g_mutex_free (pool->lock);
- pool->lock = NULL;
-
- g_async_queue_unref (pool->avail_buffers);
- pool->avail_buffers = NULL;
-
- if (pool->video_fd >= 0)
- v4l2_close (pool->video_fd);
-
- if (pool->buffers) {
- g_free (pool->buffers);
- pool->buffers = NULL;
- }
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
+ const GstCaps *caps;
+ guint size, min_buffers, max_buffers;
+ guint prefix, align;
- buffer_pool_parent_class->finalize (object);
-}
+ GST_DEBUG_OBJECT (pool, "set config");
-static void
-gst_v4l2_buffer_pool_init (GstV4l2BufferPool * pool, gpointer g_class)
-{
- pool->lock = g_mutex_new ();
- pool->running = FALSE;
- pool->num_live_buffers = 0;
-}
+ /* parse the config and keep around */
+ if (!gst_buffer_pool_config_get (config, &caps, &size, &min_buffers,
+ &max_buffers, &prefix, &align))
+ goto wrong_config;
-static void
-gst_v4l2_buffer_pool_class_init (gpointer g_class, gpointer class_data)
-{
- GObjectClass *object_class = G_OBJECT_CLASS (g_class);
-
- buffer_pool_parent_class = g_type_class_peek_parent (g_class);
+ GST_DEBUG_OBJECT (pool, "config %" GST_PTR_FORMAT, config);
- object_class->finalize = gst_v4l2_buffer_pool_finalize;
-}
-
-GType
-gst_v4l2_buffer_pool_get_type (void)
-{
- static GType _gst_v4l2_buffer_pool_type;
-
- if (G_UNLIKELY (_gst_v4l2_buffer_pool_type == 0)) {
- static const GTypeInfo v4l2_buffer_pool_info = {
- sizeof (GObjectClass),
- NULL,
- NULL,
- gst_v4l2_buffer_pool_class_init,
- NULL,
- NULL,
- sizeof (GstV4l2BufferPool),
- 0,
- (GInstanceInitFunc) gst_v4l2_buffer_pool_init,
- NULL
- };
- _gst_v4l2_buffer_pool_type = g_type_register_static (G_TYPE_OBJECT,
- "GstV4l2BufferPool", &v4l2_buffer_pool_info, 0);
- }
- return _gst_v4l2_buffer_pool_type;
-}
+ pool->min_buffers = min_buffers;
+ pool->max_buffers = max_buffers;
+ return TRUE;
-/* this is somewhat of a hack.. but better to keep the hack in
- * one place than copy/pasting it around..
- */
-static GstV4l2Object *
-get_v4l2_object (GstElement * v4l2elem)
-{
- GstV4l2Object *v4l2object = NULL;
- if (GST_IS_V4L2SRC (v4l2elem)) {
- v4l2object = (GST_V4L2SRC (v4l2elem))->v4l2object;
-#ifdef HAVE_EXPERIMENTAL
- } else if (GST_IS_V4L2SINK (v4l2elem)) {
- v4l2object = (GST_V4L2SINK (v4l2elem))->v4l2object;
-#endif
- } else {
- GST_ERROR_OBJECT (v4l2elem, "unknown v4l2 element");
+wrong_config:
+ {
+ GST_WARNING_OBJECT (pool, "invalid config %" GST_PTR_FORMAT, config);
+ return FALSE;
}
- return v4l2object;
}
-
-
-/**
- * gst_v4l2_buffer_pool_new:
- * @v4l2elem: the v4l2 element (src or sink) that owns this pool
- * @fd: the video device file descriptor
- * @num_buffers: the requested number of buffers in the pool
- * @caps: the caps to set on the buffer
- * @requeuebuf: if %TRUE, and if the pool is still in the running state, a
- * buffer with no remaining references is immediately passed back to v4l2
- * (VIDIOC_QBUF), otherwise it is returned to the pool of available buffers
- * (which can be accessed via gst_v4l2_buffer_pool_get().
- *
- * Construct a new buffer pool.
- *
- * Returns: the new pool, use gst_v4l2_buffer_pool_destroy() to free resources
- */
-GstV4l2BufferPool *
-gst_v4l2_buffer_pool_new (GstElement * v4l2elem, gint fd, gint num_buffers,
- GstCaps * caps, gboolean requeuebuf, enum v4l2_buf_type type)
+static gboolean
+gst_v4l2_buffer_pool_start (GstBufferPool * bpool)
{
- GstV4l2BufferPool *pool;
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
+ GstV4l2Object *obj = pool->obj;
gint n;
struct v4l2_requestbuffers breq;
+ gint num_buffers;
- pool = (GstV4l2BufferPool *) g_object_new (GST_TYPE_V4L2_BUFFER_POOL, NULL);
-
- pool->video_fd = v4l2_dup (fd);
- if (pool->video_fd < 0)
- goto dup_failed;
-
+ num_buffers = pool->max_buffers;
/* first, lets request buffers, and see how many we can get: */
- GST_DEBUG_OBJECT (v4l2elem, "STREAMING, requesting %d MMAP buffers",
- num_buffers);
+ GST_DEBUG_OBJECT (pool, "starting, requesting %d MMAP buffers", num_buffers);
memset (&breq, 0, sizeof (struct v4l2_requestbuffers));
- breq.type = type;
+ breq.type = obj->type;
breq.count = num_buffers;
breq.memory = V4L2_MEMORY_MMAP;
- if (v4l2_ioctl (fd, VIDIOC_REQBUFS, &breq) < 0)
+ if (v4l2_ioctl (pool->video_fd, VIDIOC_REQBUFS, &breq) < 0)
goto reqbufs_failed;
- GST_LOG_OBJECT (v4l2elem, " count: %u", breq.count);
- GST_LOG_OBJECT (v4l2elem, " type: %d", breq.type);
- GST_LOG_OBJECT (v4l2elem, " memory: %d", breq.memory);
+ GST_LOG_OBJECT (pool, " count: %u", breq.count);
+ GST_LOG_OBJECT (pool, " type: %d", breq.type);
+ GST_LOG_OBJECT (pool, " memory: %d", breq.memory);
if (breq.count < GST_V4L2_MIN_BUFFERS)
goto no_buffers;
if (num_buffers != breq.count) {
- GST_WARNING_OBJECT (v4l2elem, "using %u buffers instead", breq.count);
+ GST_WARNING_OBJECT (pool, "using %u buffers instead", breq.count);
num_buffers = breq.count;
}
- pool->v4l2elem = v4l2elem;
- pool->requeuebuf = requeuebuf;
- pool->type = type;
+ pool->obj = obj;
+ pool->requeuebuf = (obj->type == V4L2_BUF_TYPE_VIDEO_CAPTURE ? TRUE : FALSE);
pool->buffer_count = num_buffers;
pool->buffers = g_new0 (GstBuffer *, num_buffers);
- pool->avail_buffers = g_async_queue_new ();
+ pool->index = 0;
/* now, map the buffers: */
for (n = 0; n < num_buffers; n++) {
- pool->buffers[n] = gst_v4l2_buffer_new (pool, n, caps);
- if (!pool->buffers[n])
+ GstBuffer *buffer;
+
+ if (gst_v4l2_buffer_pool_alloc_buffer (bpool, &buffer, NULL) != GST_FLOW_OK)
goto buffer_new_failed;
- pool->num_live_buffers++;
- g_async_queue_push (pool->avail_buffers, pool->buffers[n]);
- }
- return pool;
+ if (pool->requeuebuf)
+ gst_v4l2_buffer_pool_qbuf (bpool, buffer);
+ }
+ return TRUE;
/* ERRORS */
-dup_failed:
- {
- gint errnosave = errno;
-
- g_object_unref (pool);
-
- errno = errnosave;
-
- return NULL;
- }
reqbufs_failed:
{
- GstV4l2Object *v4l2object = get_v4l2_object (v4l2elem);
- GST_ELEMENT_ERROR (v4l2elem, RESOURCE, READ,
- (_("Could not get buffers from device '%s'."),
- v4l2object->videodev),
- ("error requesting %d buffers: %s", num_buffers, g_strerror (errno)));
- return NULL;
+ GST_ERROR_OBJECT (pool,
+ "error requesting %d buffers: %s", num_buffers, g_strerror (errno));
+ return FALSE;
}
no_buffers:
{
- GstV4l2Object *v4l2object = get_v4l2_object (v4l2elem);
- GST_ELEMENT_ERROR (v4l2elem, RESOURCE, READ,
- (_("Could not get enough buffers from device '%s'."),
- v4l2object->videodev),
- ("we received %d from device '%s', we want at least %d",
- breq.count, v4l2object->videodev, GST_V4L2_MIN_BUFFERS));
- return NULL;
+ GST_ERROR_OBJECT (pool,
+ "we received %d from device '%s', we want at least %d",
+ breq.count, obj->videodev, GST_V4L2_MIN_BUFFERS);
+ return FALSE;
}
buffer_new_failed:
{
- gint errnosave = errno;
+ GST_ERROR_OBJECT (pool, "failed to create a buffer");
+ return FALSE;
+ }
+}
+
+static gboolean
+gst_v4l2_buffer_pool_stop (GstBufferPool * bpool)
+{
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
+ guint n;
- gst_v4l2_buffer_pool_destroy (pool);
+ GST_DEBUG_OBJECT (pool, "stopping pool");
- errno = errnosave;
+ /* free the buffers: */
+ for (n = 0; n < pool->buffer_count; n++)
+ gst_v4l2_buffer_pool_free_buffer (bpool, pool->buffers[n]);
- return NULL;
- }
+ return TRUE;
}
-/**
- * gst_v4l2_buffer_pool_destroy:
- * @pool: the pool
- *
- * Free all resources in the pool and the pool itself.
- */
-void
-gst_v4l2_buffer_pool_destroy (GstV4l2BufferPool * pool)
+static GstFlowReturn
+gst_v4l2_buffer_pool_acquire_buffer (GstBufferPool * bpool, GstBuffer ** buffer,
+ GstBufferPoolParams * params)
{
- gint n;
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
+ GstBuffer *outbuf;
+ struct v4l2_buffer vbuffer;
+ GstV4l2Object *obj = pool->obj;
+
+ if (GST_BUFFER_POOL_IS_FLUSHING (bpool))
+ goto flushing;
+
+ memset (&vbuffer, 0x00, sizeof (vbuffer));
+ vbuffer.type = obj->type;
+ vbuffer.memory = V4L2_MEMORY_MMAP;
+
+ if (v4l2_ioctl (pool->video_fd, VIDIOC_DQBUF, &vbuffer) < 0)
+ goto error;
+
+ /* get our GstBuffer with that index from the pool, if the buffer was
+ * outstanding we have a serious problem.
+ */
+ outbuf = pool->buffers[vbuffer.index];
+ if (outbuf == NULL)
+ goto no_buffers;
- GST_V4L2_BUFFER_POOL_LOCK (pool);
- pool->running = FALSE;
- GST_V4L2_BUFFER_POOL_UNLOCK (pool);
+ /* mark the buffer outstanding */
+ pool->buffers[vbuffer.index] = NULL;
- GST_DEBUG_OBJECT (pool->v4l2elem, "destroy pool");
+ GST_LOG_OBJECT (pool,
+ "dequeued frame %d (ix=%d), flags %08x, pool-ct=%d, buffer=%p",
+ vbuffer.sequence, vbuffer.index, vbuffer.flags, pool->num_live_buffers,
+ outbuf);
- /* after this point, no more buffers will be queued or dequeued; no buffer
- * from pool->buffers that is NULL will be set to a buffer, and no buffer that
- * is not NULL will be pushed out. */
+ pool->num_live_buffers++;
+ GST_DEBUG_OBJECT (pool, "num_live_buffers++: %d", pool->num_live_buffers);
- /* miniobjects have no dispose, so they can't break ref-cycles, as buffers ref
- * the pool, we need to unref the buffer to properly finalize te pool */
- for (n = 0; n < pool->buffer_count; n++) {
- GstBuffer *buf;
+ /* set top/bottom field first if v4l2_buffer has the information */
+ if (vbuffer.field == V4L2_FIELD_INTERLACED_TB)
+ GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_TFF);
+ if (vbuffer.field == V4L2_FIELD_INTERLACED_BT)
+ GST_BUFFER_FLAG_UNSET (outbuf, GST_VIDEO_BUFFER_TFF);
- GST_V4L2_BUFFER_POOL_LOCK (pool);
- buf = GST_BUFFER (pool->buffers[n]);
- GST_V4L2_BUFFER_POOL_UNLOCK (pool);
+ /* this can change at every frame, esp. with jpeg */
+ gst_buffer_resize (outbuf, 0, vbuffer.bytesused);
- if (buf)
- /* we own the ref if the buffer is in pool->buffers; drop it. */
- gst_buffer_unref (buf);
- }
+ *buffer = outbuf;
+
+ return GST_FLOW_OK;
- g_object_unref (pool);
+ /* ERRORS */
+flushing:
+ {
+ return GST_FLOW_WRONG_STATE;
+ }
+error:
+ {
+ GST_WARNING_OBJECT (pool,
+ "problem grabbing frame %d (ix=%d), pool-ct=%d, buf.flags=%d",
+ vbuffer.sequence, vbuffer.index,
+ GST_MINI_OBJECT_REFCOUNT (pool), vbuffer.flags);
+
+ switch (errno) {
+ case EAGAIN:
+ GST_WARNING_OBJECT (pool,
+ "Non-blocking I/O has been selected using O_NONBLOCK and"
+ " no buffer was in the outgoing queue. device %s", obj->videodev);
+ break;
+ case EINVAL:
+ GST_ERROR_OBJECT (pool,
+ "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", obj->videodev);
+ break;
+ case ENOMEM:
+ GST_ERROR_OBJECT (pool,
+ "insufficient memory to enqueue a user pointer buffer");
+ break;
+ case EIO:
+ GST_INFO_OBJECT (pool,
+ "VIDIOC_DQBUF failed due to an internal error."
+ " Can also indicate temporary problems like signal loss."
+ " Note the driver might dequeue an (empty) buffer despite"
+ " returning an error, or even stop capturing."
+ " device %s", obj->videodev);
+ /* have we de-queued a buffer ? */
+ if (!(vbuffer.flags & (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE))) {
+ GST_DEBUG_OBJECT (pool, "reenqueing buffer");
+ /* FIXME ... should we do something here? */
+ }
+ break;
+ case EINTR:
+ GST_WARNING_OBJECT (pool,
+ "could not sync on a buffer on device %s", obj->videodev);
+ break;
+ default:
+ GST_WARNING_OBJECT (pool,
+ "Grabbing frame got interrupted on %s unexpectedly. %d: %s.",
+ obj->videodev, errno, g_strerror (errno));
+ break;
+ }
+ return GST_FLOW_ERROR;
+ }
+no_buffers:
+ {
+ GST_ERROR_OBJECT (pool, "No free buffers found in the pool at index %d.",
+ vbuffer.index);
+ return GST_FLOW_ERROR;
+ }
}
-/**
- * gst_v4l2_buffer_pool_get:
- * @pool: the "this" object
- * @blocking: should this call suspend until there is a buffer available
- * in the buffer pool?
- *
- * Get an available buffer in the pool
- */
-GstBuffer *
-gst_v4l2_buffer_pool_get (GstV4l2BufferPool * pool, gboolean blocking)
+static void
+gst_v4l2_buffer_pool_release_buffer (GstBufferPool * bpool, GstBuffer * buffer)
{
- GstBuffer *buf;
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
- if (blocking) {
- buf = g_async_queue_pop (pool->avail_buffers);
- } else {
- buf = g_async_queue_try_pop (pool->avail_buffers);
- }
+ GST_DEBUG_OBJECT (pool, "release");
+
+ if (pool->requeuebuf)
+ gst_v4l2_buffer_pool_qbuf (bpool, buffer);
+}
- if (buf) {
- GstMetaV4l2 *meta = GST_META_V4L2_GET (buf);
+static void
+gst_v4l2_buffer_pool_finalize (GObject * object)
+{
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (object);
- GST_V4L2_BUFFER_POOL_LOCK (pool);
- gst_buffer_resize (buf, 0, meta->vbuffer.length);
- GST_BUFFER_FLAG_UNSET (buf, 0xffffffff);
- GST_V4L2_BUFFER_POOL_UNLOCK (pool);
+ if (pool->video_fd >= 0)
+ v4l2_close (pool->video_fd);
+
+ if (pool->buffers) {
+ g_free (pool->buffers);
+ pool->buffers = NULL;
}
- pool->running = TRUE;
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
- return buf;
+static void
+gst_v4l2_buffer_pool_init (GstV4l2BufferPool * pool)
+{
}
+static void
+gst_v4l2_buffer_pool_class_init (GstV4l2BufferPoolClass * klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GstBufferPoolClass *bufferpool_class = GST_BUFFER_POOL_CLASS (klass);
+
+ object_class->finalize = gst_v4l2_buffer_pool_finalize;
+
+ bufferpool_class->start = gst_v4l2_buffer_pool_start;
+ bufferpool_class->stop = gst_v4l2_buffer_pool_stop;
+ bufferpool_class->set_config = gst_v4l2_buffer_pool_set_config;
+ bufferpool_class->alloc_buffer = gst_v4l2_buffer_pool_alloc_buffer;
+ bufferpool_class->acquire_buffer = gst_v4l2_buffer_pool_acquire_buffer;
+ bufferpool_class->release_buffer = gst_v4l2_buffer_pool_release_buffer;
+ bufferpool_class->free_buffer = gst_v4l2_buffer_pool_free_buffer;
+}
/**
- * gst_v4l2_buffer_pool_qbuf:
- * @pool: the pool
- * @buf: the buffer to queue
+ * gst_v4l2_buffer_pool_new:
+ * @obj: the v4l2 object owning the pool
+ * @num_buffers: the requested number of buffers in the pool
+ * @requeuebuf: if %TRUE, and if the pool is still in the running state, a
+ * buffer with no remaining references is immediately passed back to v4l2
+ * (VIDIOC_QBUF), otherwise it is returned to the pool of available buffers
+ * (which can be accessed via gst_v4l2_buffer_pool_get().
*
- * Queue a buffer to the driver
+ * Construct a new buffer pool.
*
- * Returns: %TRUE for success
+ * Returns: the new pool, use gst_v4l2_buffer_pool_destroy() to free resources
*/
-gboolean
-gst_v4l2_buffer_pool_qbuf (GstV4l2BufferPool * pool, GstBuffer * buf)
+GstBufferPool *
+gst_v4l2_buffer_pool_new (GstV4l2Object * obj)
{
- GstMetaV4l2 *meta;
+ GstV4l2BufferPool *pool;
- meta = GST_META_V4L2_GET (buf);
+ pool = (GstV4l2BufferPool *) g_object_new (GST_TYPE_V4L2_BUFFER_POOL, NULL);
- GST_LOG_OBJECT (pool->v4l2elem, "enqueue pool buffer %d",
- meta->vbuffer.index);
+ pool->video_fd = v4l2_dup (obj->video_fd);
+ if (pool->video_fd < 0)
+ goto dup_failed;
- if (v4l2_ioctl (pool->video_fd, VIDIOC_QBUF, &meta->vbuffer) < 0)
- return FALSE;
+ pool->obj = obj;
- pool->num_live_buffers--;
- GST_DEBUG_OBJECT (pool->v4l2elem, "num_live_buffers--: %d",
- pool->num_live_buffers);
+ return GST_BUFFER_POOL_CAST (pool);
- return TRUE;
+ /* ERRORS */
+dup_failed:
+ {
+ gint errnosave = errno;
+ gst_object_unref (pool);
+ errno = errnosave;
+ return NULL;
+ }
}
/**
- * gst_v4l2_buffer_pool_dqbuf:
+ * gst_v4l2_buffer_pool_qbuf:
* @pool: the pool
+ * @buf: the buffer to queue
*
- * Dequeue a buffer from the driver. Some generic error handling is done in
- * this function, but any error handling specific to v4l2src (capture) or
- * v4l2sink (output) can be done outside this function by checking 'errno'
+ * Queue a buffer to the driver
*
- * Returns: a buffer
+ * Returns: %TRUE for success
*/
-GstBuffer *
-gst_v4l2_buffer_pool_dqbuf (GstV4l2BufferPool * pool)
+gboolean
+gst_v4l2_buffer_pool_qbuf (GstBufferPool * bpool, GstBuffer * buf)
{
- GstV4l2Object *v4l2object = get_v4l2_object (pool->v4l2elem);
- GstBuffer *pool_buffer;
- struct v4l2_buffer buffer;
-
- memset (&buffer, 0x00, sizeof (buffer));
- buffer.type = pool->type;
- buffer.memory = V4L2_MEMORY_MMAP;
-
- if (v4l2_ioctl (pool->video_fd, VIDIOC_DQBUF, &buffer) >= 0) {
-
- GST_V4L2_BUFFER_POOL_LOCK (pool);
-
- /* get our GstBuffer with that index from the pool, if the buffer was
- * outstanding we have a serious problem.
- */
- pool_buffer = pool->buffers[buffer.index];
-
- if (pool_buffer == NULL) {
- GST_ELEMENT_ERROR (pool->v4l2elem, RESOURCE, FAILED,
- (_("Failed trying to get video frames from device '%s'."),
- v4l2object->videodev),
- (_("No free buffers found in the pool at index %d."), buffer.index));
- GST_V4L2_BUFFER_POOL_UNLOCK (pool);
- return NULL;
- }
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
+ GstMetaV4l2 *meta;
+ gint index;
- GST_LOG_OBJECT (pool->v4l2elem,
- "grabbed frame %d (ix=%d), flags %08x, pool-ct=%d, buffer=%p",
- buffer.sequence, buffer.index, buffer.flags, pool->num_live_buffers,
- pool_buffer);
+ meta = GST_META_V4L2_GET (buf);
+ g_assert (meta != NULL);
- pool->num_live_buffers++;
- GST_DEBUG_OBJECT (pool->v4l2elem, "num_live_buffers++: %d",
- pool->num_live_buffers);
+ index = meta->vbuffer.index;
- /* set top/bottom field first if v4l2_buffer has the information */
- if (buffer.field == V4L2_FIELD_INTERLACED_TB)
- GST_BUFFER_FLAG_SET (pool_buffer, GST_VIDEO_BUFFER_TFF);
- if (buffer.field == V4L2_FIELD_INTERLACED_BT)
- GST_BUFFER_FLAG_UNSET (pool_buffer, GST_VIDEO_BUFFER_TFF);
+ GST_LOG_OBJECT (pool, "enqueue pool buffer %d", index);
- /* this can change at every frame, esp. with jpeg */
- gst_buffer_resize (pool_buffer, 0, buffer.bytesused);
+ if (pool->buffers[index] != NULL)
+ goto already_queued;
- GST_V4L2_BUFFER_POOL_UNLOCK (pool);
+ if (v4l2_ioctl (pool->video_fd, VIDIOC_QBUF, &meta->vbuffer) < 0)
+ goto queue_failed;
- return pool_buffer;
- }
+ pool->buffers[index] = buf;
+ pool->num_live_buffers--;
+ GST_DEBUG_OBJECT (pool, "num_live_buffers--: %d", pool->num_live_buffers);
- GST_WARNING_OBJECT (pool->v4l2elem,
- "problem grabbing frame %d (ix=%d), pool-ct=%d, buf.flags=%d",
- buffer.sequence, buffer.index,
- GST_MINI_OBJECT_REFCOUNT (pool), buffer.flags);
-
- switch (errno) {
- case EAGAIN:
- GST_WARNING_OBJECT (pool->v4l2elem,
- "Non-blocking I/O has been selected using O_NONBLOCK and"
- " no buffer was in the outgoing queue. device %s",
- v4l2object->videodev);
- break;
- case EINVAL:
- GST_ELEMENT_ERROR (pool->v4l2elem, RESOURCE, FAILED,
- (_("Failed trying to get video frames from device '%s'."),
- v4l2object->videodev),
- (_("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));
- break;
- case ENOMEM:
- GST_ELEMENT_ERROR (pool->v4l2elem, RESOURCE, FAILED,
- (_("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));
- break;
- case EIO:
- GST_INFO_OBJECT (pool->v4l2elem,
- "VIDIOC_DQBUF failed due to an internal error."
- " Can also indicate temporary problems like signal loss."
- " Note the driver might dequeue an (empty) buffer despite"
- " returning an error, or even stop capturing."
- " device %s", v4l2object->videodev);
- /* have we de-queued a buffer ? */
- if (!(buffer.flags & (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE))) {
- GST_DEBUG_OBJECT (pool->v4l2elem, "reenqueing buffer");
- /* FIXME ... should we do something here? */
- }
- break;
- case EINTR:
- GST_WARNING_OBJECT (pool->v4l2elem,
- "could not sync on a buffer on device %s", v4l2object->videodev);
- break;
- default:
- GST_WARNING_OBJECT (pool->v4l2elem,
- "Grabbing frame got interrupted on %s unexpectedly. %d: %s.",
- v4l2object->videodev, errno, g_strerror (errno));
- break;
- }
+ return TRUE;
- return NULL;
+ /* ERRORS */
+already_queued:
+ {
+ GST_WARNING_OBJECT (pool, "the buffer was already queued");
+ return FALSE;
+ }
+queue_failed:
+ {
+ GST_WARNING_OBJECT (pool, "could not queue a buffer");
+ return FALSE;
+ }
}
/**
* Returns: the number of buffers available.
*/
gint
-gst_v4l2_buffer_pool_available_buffers (GstV4l2BufferPool * pool)
+gst_v4l2_buffer_pool_available_buffers (GstBufferPool * bpool)
{
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
+
return pool->buffer_count - pool->num_live_buffers;
}
projects / platform / upstream / gstreamer.git / blobdiff