#include <unistd.h>
#include "gst/video/video.h"
+#include "gst/video/gstvideometa.h"
+#include "gst/video/gstvideopool.h"
#include <gstv4l2bufferpool.h>
+
#include "gstv4l2src.h"
-#ifdef HAVE_EXPERIMENTAL
#include "gstv4l2sink.h"
-#endif
#include "v4l2_calls.h"
#include "gst/gst-i18n-plugin.h"
#include <gst/glib-compat-private.h>
GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
#define GST_CAT_DEFAULT v4l2_debug
-
/*
* GstV4l2Buffer:
*/
-
-static GstBufferClass *v4l2buffer_parent_class = NULL;
-
-static void
-gst_v4l2_buffer_finalize (GstV4l2Buffer * buffer)
+GType
+gst_v4l2_meta_api_get_type (void)
{
- GstV4l2BufferPool *pool;
- gboolean resuscitated = FALSE;
- gint index;
-
- pool = buffer->pool;
-
- index = buffer->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");
- }
+ static volatile GType type;
+ static const gchar *tags[] = { "memory", NULL };
- if (resuscitated) {
- /* FIXME: check that the caps didn't change */
- GST_LOG_OBJECT (pool->v4l2elem, "reviving buffer %p, %d", buffer, index);
- gst_buffer_ref (GST_BUFFER (buffer));
- GST_BUFFER_SIZE (buffer) = 0;
- pool->buffers[index] = buffer;
- }
-
- GST_V4L2_BUFFER_POOL_UNLOCK (pool);
-
- if (!resuscitated) {
- GST_LOG_OBJECT (pool->v4l2elem,
- "buffer %p (data %p, len %u) not recovered, unmapping",
- buffer, GST_BUFFER_DATA (buffer), buffer->mmap_length);
- gst_mini_object_unref (GST_MINI_OBJECT (pool));
- v4l2_munmap ((void *) GST_BUFFER_DATA (buffer), buffer->mmap_length);
-
- GST_MINI_OBJECT_CLASS (v4l2buffer_parent_class)->finalize (GST_MINI_OBJECT
- (buffer));
+ if (g_once_init_enter (&type)) {
+ GType _type = gst_meta_api_type_register ("GstV4l2MetaAPI", tags);
+ g_once_init_leave (&type, _type);
}
+ return type;
}
-static void
-gst_v4l2_buffer_class_init (gpointer g_class, gpointer class_data)
+const GstMetaInfo *
+gst_v4l2_meta_get_info (void)
{
- GstMiniObjectClass *mini_object_class = GST_MINI_OBJECT_CLASS (g_class);
+ static const GstMetaInfo *meta_info = NULL;
- v4l2buffer_parent_class = g_type_class_peek_parent (g_class);
-
- mini_object_class->finalize = (GstMiniObjectFinalizeFunction)
- gst_v4l2_buffer_finalize;
-}
-
-GType
-gst_v4l2_buffer_get_type (void)
-{
- static GType _gst_v4l2_buffer_type;
-
- if (G_UNLIKELY (_gst_v4l2_buffer_type == 0)) {
- static const GTypeInfo v4l2_buffer_info = {
- sizeof (GstBufferClass),
- NULL,
- NULL,
- gst_v4l2_buffer_class_init,
- NULL,
- NULL,
- sizeof (GstV4l2Buffer),
- 0,
- NULL,
- NULL
- };
- _gst_v4l2_buffer_type = g_type_register_static (GST_TYPE_BUFFER,
- "GstV4l2Buffer", &v4l2_buffer_info, 0);
- }
- return _gst_v4l2_buffer_type;
+ if (meta_info == NULL) {
+ meta_info =
+ gst_meta_register (gst_v4l2_meta_api_get_type (), "GstV4l2Meta",
+ sizeof (GstV4l2Meta), (GstMetaInitFunction) NULL,
+ (GstMetaFreeFunction) NULL, (GstMetaTransformFunction) NULL);
+ }
+ return meta_info;
}
-static GstV4l2Buffer *
-gst_v4l2_buffer_new (GstV4l2BufferPool * pool, guint index, GstCaps * caps)
-{
- GstV4l2Buffer *ret;
- guint8 *data;
-
- ret = (GstV4l2Buffer *) gst_mini_object_new (GST_TYPE_V4L2_BUFFER);
+/*
+ * GstV4l2BufferPool:
+ */
+#define gst_v4l2_buffer_pool_parent_class parent_class
+G_DEFINE_TYPE (GstV4l2BufferPool, gst_v4l2_buffer_pool, GST_TYPE_BUFFER_POOL);
- GST_LOG_OBJECT (pool->v4l2elem, "creating buffer %u, %p in pool %p", index,
- ret, pool);
+static void gst_v4l2_buffer_pool_release_buffer (GstBufferPool * bpool,
+ GstBuffer * buffer);
- ret->pool =
- (GstV4l2BufferPool *) gst_mini_object_ref (GST_MINI_OBJECT (pool));
+static void
+gst_v4l2_buffer_pool_free_buffer (GstBufferPool * bpool, GstBuffer * buffer)
+{
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
+ GstV4l2Object *obj;
- ret->vbuffer.index = index;
- ret->vbuffer.type = pool->type;
- ret->vbuffer.memory = V4L2_MEMORY_MMAP;
+ obj = pool->obj;
- if (v4l2_ioctl (pool->video_fd, VIDIOC_QUERYBUF, &ret->vbuffer) < 0)
- goto querybuf_failed;
+ switch (obj->mode) {
+ case GST_V4L2_IO_RW:
+ break;
+ case GST_V4L2_IO_MMAP:
+ {
+ GstV4l2Meta *meta;
+ gint index;
- GST_LOG_OBJECT (pool->v4l2elem, " index: %u", ret->vbuffer.index);
- GST_LOG_OBJECT (pool->v4l2elem, " type: %d", ret->vbuffer.type);
- GST_LOG_OBJECT (pool->v4l2elem, " bytesused: %u", ret->vbuffer.bytesused);
- GST_LOG_OBJECT (pool->v4l2elem, " flags: %08x", ret->vbuffer.flags);
- GST_LOG_OBJECT (pool->v4l2elem, " field: %d", ret->vbuffer.field);
- GST_LOG_OBJECT (pool->v4l2elem, " memory: %d", ret->vbuffer.memory);
- if (ret->vbuffer.memory == V4L2_MEMORY_MMAP)
- GST_LOG_OBJECT (pool->v4l2elem, " MMAP offset: %u",
- ret->vbuffer.m.offset);
- GST_LOG_OBJECT (pool->v4l2elem, " length: %u", ret->vbuffer.length);
- GST_LOG_OBJECT (pool->v4l2elem, " input: %u", ret->vbuffer.input);
+ meta = GST_V4L2_META_GET (buffer);
+ g_assert (meta != NULL);
- ret->mmap_length = ret->vbuffer.length;
- data = (guint8 *) v4l2_mmap (0, ret->vbuffer.length,
- PROT_READ | PROT_WRITE, MAP_SHARED, pool->video_fd,
- ret->vbuffer.m.offset);
+ index = meta->vbuffer.index;
+ GST_LOG_OBJECT (pool,
+ "mmap buffer %p idx %d (data %p, len %u) freed, unmapping", buffer,
+ index, meta->mem, meta->vbuffer.length);
- if (data == MAP_FAILED)
- goto mmap_failed;
+ v4l2_munmap (meta->mem, meta->vbuffer.length);
+ pool->buffers[index] = NULL;
+ break;
+ }
+ case GST_V4L2_IO_USERPTR:
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+ gst_buffer_unref (buffer);
+}
- GST_BUFFER_DATA (ret) = data;
- GST_BUFFER_SIZE (ret) = ret->vbuffer.length;
+static GstFlowReturn
+gst_v4l2_buffer_pool_alloc_buffer (GstBufferPool * bpool, GstBuffer ** buffer,
+ GstBufferPoolAcquireParams * params)
+{
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
+ GstBuffer *newbuf;
+ GstV4l2Meta *meta;
+ GstV4l2Object *obj;
+ GstVideoInfo *info;
+ guint index;
+
+ obj = pool->obj;
+ info = &obj->info;
+
+ switch (obj->mode) {
+ case GST_V4L2_IO_RW:
+ {
+ newbuf =
+ gst_buffer_new_allocate (pool->allocator, pool->size, &pool->params);
+ break;
+ }
+ case GST_V4L2_IO_MMAP:
+ {
+ newbuf = gst_buffer_new ();
+ meta = GST_V4L2_META_ADD (newbuf);
+
+ index = pool->num_allocated;
+
+ GST_LOG_OBJECT (pool, "creating buffer %u, %p", index, newbuf);
+
+ meta->vbuffer.index = index;
+ 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, " 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, " 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,
+ meta->vbuffer.m.offset);
+ if (meta->mem == MAP_FAILED)
+ goto mmap_failed;
+
+ gst_buffer_append_memory (newbuf,
+ gst_memory_new_wrapped (GST_MEMORY_FLAG_NO_SHARE,
+ meta->mem, meta->vbuffer.length, 0, meta->vbuffer.length, NULL,
+ NULL));
+
+ /* add metadata to raw video buffers */
+ if (pool->add_videometa && 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, stride %d", stride[0]);
+ gst_buffer_add_video_meta_full (newbuf, GST_VIDEO_FRAME_FLAG_NONE,
+ GST_VIDEO_INFO_FORMAT (info), GST_VIDEO_INFO_WIDTH (info),
+ GST_VIDEO_INFO_HEIGHT (info), GST_VIDEO_INFO_N_PLANES (info),
+ offset, stride);
+ }
+ break;
+ }
+ case GST_V4L2_IO_USERPTR:
+ default:
+ g_assert_not_reached ();
+ break;
+ }
- GST_BUFFER_FLAG_SET (ret, GST_BUFFER_FLAG_READONLY);
+ pool->num_allocated++;
- gst_buffer_set_caps (GST_BUFFER (ret), caps);
+ *buffer = newbuf;
- return ret;
+ return GST_FLOW_OK;
/* ERRORS */
querybuf_failed:
gint errnosave = errno;
GST_WARNING ("Failed QUERYBUF: %s", g_strerror (errnosave));
- gst_buffer_unref (GST_BUFFER (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 (GST_BUFFER (ret));
+ gst_buffer_unref (newbuf);
errno = errnosave;
- return NULL;
+ return GST_FLOW_ERROR;
}
}
+static gboolean
+gst_v4l2_buffer_pool_set_config (GstBufferPool * bpool, GstStructure * config)
+{
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
+ GstV4l2Object *obj = pool->obj;
+ GstCaps *caps;
+ guint size, min_buffers, max_buffers, num_buffers, copy_threshold;
+ GstAllocator *allocator;
+ GstAllocationParams params;
+ struct v4l2_requestbuffers breq;
-/*
- * GstV4l2BufferPool:
- */
+ GST_DEBUG_OBJECT (pool, "set config");
-static GstMiniObjectClass *buffer_pool_parent_class = NULL;
+ pool->add_videometa =
+ gst_buffer_pool_config_has_option (config,
+ GST_BUFFER_POOL_OPTION_VIDEO_META);
-static void
-gst_v4l2_buffer_pool_finalize (GstV4l2BufferPool * pool)
-{
- g_mutex_free (pool->lock);
- pool->lock = NULL;
+ if (!pool->add_videometa) {
+ gint stride;
- g_async_queue_unref (pool->avail_buffers);
- pool->avail_buffers = NULL;
+ /* we don't have video metadata, see if the strides are compatible */
+ stride = GST_VIDEO_INFO_PLANE_STRIDE (&obj->info, 0);
- if (pool->video_fd >= 0)
- v4l2_close (pool->video_fd);
+ GST_DEBUG_OBJECT (pool, "no videometadata, checking strides %d and %u",
+ stride, obj->bytesperline);
- if (pool->buffers) {
- g_free (pool->buffers);
- pool->buffers = NULL;
+ if (stride != obj->bytesperline)
+ goto missing_video_api;
}
- GST_MINI_OBJECT_CLASS (buffer_pool_parent_class)->finalize (GST_MINI_OBJECT
- (pool));
-}
+ /* parse the config and keep around */
+ if (!gst_buffer_pool_config_get_params (config, &caps, &size, &min_buffers,
+ &max_buffers))
+ goto wrong_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;
-}
+ if (!gst_buffer_pool_config_get_allocator (config, &allocator, ¶ms))
+ goto wrong_config;
-static void
-gst_v4l2_buffer_pool_class_init (gpointer g_class, gpointer class_data)
-{
- GstMiniObjectClass *mini_object_class = GST_MINI_OBJECT_CLASS (g_class);
+ GST_DEBUG_OBJECT (pool, "config %" GST_PTR_FORMAT, config);
- buffer_pool_parent_class = g_type_class_peek_parent (g_class);
+ switch (obj->mode) {
+ case GST_V4L2_IO_RW:
+ /* we preallocate 1 buffer, this value also instructs the latency
+ * calculation to have 1 frame latency max */
+ num_buffers = 1;
+ copy_threshold = 0;
+ break;
+ case GST_V4L2_IO_MMAP:
+ {
+ /* request a reasonable number of buffers when no max specified. We will
+ * copy when we run out of buffers */
+ if (max_buffers == 0)
+ num_buffers = 4;
+ else
+ num_buffers = max_buffers;
+
+ /* first, lets request buffers, and see how many we can get: */
+ GST_DEBUG_OBJECT (pool, "starting, requesting %d MMAP buffers",
+ num_buffers);
+
+ memset (&breq, 0, sizeof (struct v4l2_requestbuffers));
+ breq.type = obj->type;
+ breq.count = num_buffers;
+ breq.memory = V4L2_MEMORY_MMAP;
+
+ if (v4l2_ioctl (pool->video_fd, VIDIOC_REQBUFS, &breq) < 0)
+ goto reqbufs_failed;
+
+ 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 (pool, "using %u buffers instead", breq.count);
+ num_buffers = breq.count;
+ }
+ /* update min buffers with the amount of buffers we just reserved. We need
+ * to configure this value in the bufferpool so that the default start
+ * implementation calls our allocate function */
+ min_buffers = breq.count;
+
+ if (max_buffers == 0 || num_buffers < max_buffers) {
+ /* if we are asked to provide more buffers than we have allocated, start
+ * copying buffers when we only have 2 buffers left in the pool */
+ copy_threshold = 2;
+ } else {
+ /* we are certain that we have enough buffers so we don't need to
+ * copy */
+ copy_threshold = 0;
+ }
+ break;
+ }
+ case GST_V4L2_IO_USERPTR:
+ default:
+ num_buffers = 0;
+ copy_threshold = 0;
+ g_assert_not_reached ();
+ break;
+ }
- mini_object_class->finalize = (GstMiniObjectFinalizeFunction)
- gst_v4l2_buffer_pool_finalize;
-}
+ pool->size = size;
+ pool->num_buffers = num_buffers;
+ pool->copy_threshold = copy_threshold;
+ if (pool->allocator)
+ gst_allocator_unref (pool->allocator);
+ if ((pool->allocator = allocator))
+ gst_allocator_ref (allocator);
+ pool->params = params;
-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 (GstMiniObjectClass),
- 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 (GST_TYPE_MINI_OBJECT,
- "GstV4l2BufferPool", &v4l2_buffer_pool_info, 0);
- }
- return _gst_v4l2_buffer_pool_type;
-}
+ gst_buffer_pool_config_set_params (config, caps, size, min_buffers,
+ max_buffers);
+ return GST_BUFFER_POOL_CLASS (parent_class)->set_config (bpool, config);
-/* 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");
+ /* ERRORS */
+missing_video_api:
+ {
+ GST_ERROR_OBJECT (pool, "missing GstMetaVideo API in config, "
+ "default stride: %d, wanted stride %u",
+ GST_VIDEO_INFO_PLANE_STRIDE (&obj->info, 0), obj->bytesperline);
+ return FALSE;
+ }
+wrong_config:
+ {
+ GST_ERROR_OBJECT (pool, "invalid config %" GST_PTR_FORMAT, config);
+ return FALSE;
+ }
+reqbufs_failed:
+ {
+ GST_ERROR_OBJECT (pool,
+ "error requesting %d buffers: %s", num_buffers, g_strerror (errno));
+ return FALSE;
+ }
+no_buffers:
+ {
+ 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;
}
- return v4l2object;
}
+static gboolean
+start_streaming (GstV4l2BufferPool * pool)
+{
+ GstV4l2Object *obj = pool->obj;
+
+ switch (obj->mode) {
+ case GST_V4L2_IO_RW:
+ break;
+ case GST_V4L2_IO_MMAP:
+ case GST_V4L2_IO_USERPTR:
+ GST_DEBUG_OBJECT (pool, "STREAMON");
+ if (v4l2_ioctl (pool->video_fd, VIDIOC_STREAMON, &obj->type) < 0)
+ goto start_failed;
+ break;
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+ pool->streaming = TRUE;
-/**
- * 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)
-{
- GstV4l2BufferPool *pool;
- gint n;
- struct v4l2_requestbuffers breq;
+ return TRUE;
- pool = (GstV4l2BufferPool *) gst_mini_object_new (GST_TYPE_V4L2_BUFFER_POOL);
+ /* ERRORS */
+start_failed:
+ {
+ GST_ERROR_OBJECT (pool, "error with STREAMON %d (%s)", errno,
+ g_strerror (errno));
+ return FALSE;
+ }
+}
- pool->video_fd = v4l2_dup (fd);
- if (pool->video_fd < 0)
- goto dup_failed;
+static gboolean
+gst_v4l2_buffer_pool_start (GstBufferPool * bpool)
+{
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
+ GstV4l2Object *obj = pool->obj;
+ pool->obj = obj;
+ pool->buffers = g_new0 (GstBuffer *, pool->num_buffers);
+ pool->num_allocated = 0;
- /* first, lets request buffers, and see how many we can get: */
- GST_DEBUG_OBJECT (v4l2elem, "STREAMING, requesting %d MMAP buffers",
- num_buffers);
+ /* now, allocate the buffers: */
+ if (!GST_BUFFER_POOL_CLASS (parent_class)->start (bpool))
+ goto start_failed;
- memset (&breq, 0, sizeof (struct v4l2_requestbuffers));
- breq.type = type;
- breq.count = num_buffers;
- breq.memory = V4L2_MEMORY_MMAP;
+ /* we can start capturing now, we wait for the playback case until we queued
+ * the first buffer */
+ if (obj->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ if (!start_streaming (pool))
+ goto start_failed;
- if (v4l2_ioctl (fd, VIDIOC_REQBUFS, &breq) < 0)
- goto reqbufs_failed;
+ gst_poll_set_flushing (obj->poll, FALSE);
- GST_LOG_OBJECT (v4l2elem, " count: %u", breq.count);
- GST_LOG_OBJECT (v4l2elem, " type: %d", breq.type);
- GST_LOG_OBJECT (v4l2elem, " memory: %d", breq.memory);
+ return TRUE;
- if (breq.count < GST_V4L2_MIN_BUFFERS)
- goto no_buffers;
+ /* ERRORS */
+start_failed:
+ {
+ GST_ERROR_OBJECT (pool, "failed to start streaming");
+ return FALSE;
+ }
+}
- if (num_buffers != breq.count) {
- GST_WARNING_OBJECT (v4l2elem, "using %u buffers instead", breq.count);
- num_buffers = breq.count;
+static gboolean
+gst_v4l2_buffer_pool_stop (GstBufferPool * bpool)
+{
+ gboolean ret;
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
+ GstV4l2Object *obj = pool->obj;
+ guint n;
+
+ GST_DEBUG_OBJECT (pool, "stopping pool");
+
+ gst_poll_set_flushing (obj->poll, TRUE);
+
+ if (pool->streaming) {
+ switch (obj->mode) {
+ case GST_V4L2_IO_RW:
+ break;
+ case GST_V4L2_IO_MMAP:
+ case GST_V4L2_IO_USERPTR:
+ /* we actually need to sync on all queued buffers but not
+ * on the non-queued ones */
+ GST_DEBUG_OBJECT (pool, "STREAMOFF");
+ if (v4l2_ioctl (pool->video_fd, VIDIOC_STREAMOFF, &obj->type) < 0)
+ goto stop_failed;
+ break;
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+ pool->streaming = FALSE;
}
- pool->v4l2elem = v4l2elem;
- pool->requeuebuf = requeuebuf;
- pool->type = type;
- pool->buffer_count = num_buffers;
- pool->buffers = g_new0 (GstV4l2Buffer *, num_buffers);
- pool->avail_buffers = g_async_queue_new ();
+ /* first free the buffers in the queue */
+ ret = GST_BUFFER_POOL_CLASS (parent_class)->stop (bpool);
- /* 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])
- goto buffer_new_failed;
- pool->num_live_buffers++;
- g_async_queue_push (pool->avail_buffers, pool->buffers[n]);
+ /* then free the remaining buffers */
+ for (n = 0; n < pool->num_queued; n++) {
+ gst_v4l2_buffer_pool_free_buffer (bpool, pool->buffers[n]);
}
+ g_free (pool->buffers);
+ pool->buffers = NULL;
- return pool;
+ return ret;
/* ERRORS */
-dup_failed:
+stop_failed:
{
- gint errnosave = errno;
-
- gst_mini_object_unref (GST_MINI_OBJECT (pool));
-
- errno = errnosave;
+ GST_ERROR_OBJECT (pool, "error with STREAMOFF %d (%s)", errno,
+ g_strerror (errno));
+ return FALSE;
+ }
+}
- return NULL;
+static GstFlowReturn
+gst_v4l2_object_poll (GstV4l2Object * v4l2object)
+{
+ gint ret;
+
+ if (v4l2object->can_poll_device) {
+ GST_LOG_OBJECT (v4l2object->element, "polling device");
+ ret = gst_poll_wait (v4l2object->poll, GST_CLOCK_TIME_NONE);
+ if (G_UNLIKELY (ret < 0)) {
+ if (errno == EBUSY)
+ goto stopped;
+ if (errno == ENXIO) {
+ GST_WARNING_OBJECT (v4l2object->element,
+ "v4l2 device doesn't support polling. Disabling");
+ v4l2object->can_poll_device = FALSE;
+ } else {
+ if (errno != EAGAIN && errno != EINTR)
+ goto select_error;
+ }
+ }
}
-reqbufs_failed:
+ return GST_FLOW_OK;
+
+ /* ERRORS */
+stopped:
{
- 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_DEBUG ("stop called");
+ return GST_FLOW_FLUSHING;
}
-no_buffers:
+select_error:
{
- 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_ELEMENT_ERROR (v4l2object->element, RESOURCE, READ, (NULL),
+ ("poll error %d: %s (%d)", ret, g_strerror (errno), errno));
+ return GST_FLOW_ERROR;
}
-buffer_new_failed:
- {
- gint errnosave = errno;
+}
- gst_v4l2_buffer_pool_destroy (pool);
+static GstFlowReturn
+gst_v4l2_buffer_pool_qbuf (GstV4l2BufferPool * pool, GstBuffer * buf)
+{
+ GstV4l2Meta *meta;
+ gint index;
- errno = errnosave;
+ meta = GST_V4L2_META_GET (buf);
+ if (meta == NULL) {
+ GST_LOG_OBJECT (pool, "unref copied buffer %p", buf);
+ /* no meta, it was a copied buffer that we can unref */
+ gst_buffer_unref (buf);
+ return GST_FLOW_OK;
+ }
- return NULL;
+ index = meta->vbuffer.index;
+
+ GST_LOG_OBJECT (pool, "enqueue buffer %p, index:%d, queued:%d, flags:%08x",
+ buf, index, pool->num_queued, meta->vbuffer.flags);
+
+ if (pool->buffers[index] != NULL)
+ goto already_queued;
+
+ GST_LOG_OBJECT (pool, "doing QBUF");
+ if (v4l2_ioctl (pool->video_fd, VIDIOC_QBUF, &meta->vbuffer) < 0)
+ goto queue_failed;
+
+ pool->buffers[index] = buf;
+ pool->num_queued++;
+
+ return GST_FLOW_OK;
+
+ /* ERRORS */
+already_queued:
+ {
+ GST_WARNING_OBJECT (pool, "the buffer was already queued");
+ return GST_FLOW_ERROR;
+ }
+queue_failed:
+ {
+ GST_WARNING_OBJECT (pool, "could not queue a buffer %d (%s)", errno,
+ g_strerror (errno));
+ return GST_FLOW_ERROR;
}
}
-/**
- * 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_dqbuf (GstV4l2BufferPool * pool, GstBuffer ** buffer)
{
- gint n;
+ GstFlowReturn res;
+ GstBuffer *outbuf;
+ struct v4l2_buffer vbuffer;
+ GstV4l2Object *obj = pool->obj;
+ GstClockTime timestamp;
+
+ if (obj->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+ /* select works for input devices when data is available. According to the
+ * specs we can also poll to find out when a frame has been displayed but
+ * that just seems to lock up here */
+ if ((res = gst_v4l2_object_poll (obj)) != GST_FLOW_OK)
+ goto poll_error;
+ }
+
+ memset (&vbuffer, 0x00, sizeof (vbuffer));
+ vbuffer.type = obj->type;
+ vbuffer.memory = V4L2_MEMORY_MMAP;
- GST_V4L2_BUFFER_POOL_LOCK (pool);
- pool->running = FALSE;
- GST_V4L2_BUFFER_POOL_UNLOCK (pool);
+ GST_LOG_OBJECT (pool, "doing DQBUF");
+ if (v4l2_ioctl (pool->video_fd, VIDIOC_DQBUF, &vbuffer) < 0)
+ goto error;
- GST_DEBUG_OBJECT (pool->v4l2elem, "destroy pool");
+ /* 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_buffer;
- /* 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. */
+ /* mark the buffer outstanding */
+ pool->buffers[vbuffer.index] = NULL;
+ pool->num_queued--;
- /* 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;
+ timestamp = GST_TIMEVAL_TO_TIME (vbuffer.timestamp);
- GST_V4L2_BUFFER_POOL_LOCK (pool);
- buf = GST_BUFFER (pool->buffers[n]);
- GST_V4L2_BUFFER_POOL_UNLOCK (pool);
+ GST_LOG_OBJECT (pool,
+ "dequeued buffer %p seq:%d (ix=%d), used %d, flags %08x, ts %"
+ GST_TIME_FORMAT ", pool-queued=%d, buffer=%p", outbuf, vbuffer.sequence,
+ vbuffer.index, vbuffer.bytesused, vbuffer.flags,
+ GST_TIME_ARGS (timestamp), pool->num_queued, outbuf);
- if (buf)
- /* we own the ref if the buffer is in pool->buffers; drop it. */
- gst_buffer_unref (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_FLAG_TFF);
}
+ if (vbuffer.field == V4L2_FIELD_INTERLACED_BT) {
+ GST_BUFFER_FLAG_UNSET (outbuf, GST_VIDEO_BUFFER_FLAG_TFF);
+ }
+
+ /* this can change at every frame, esp. with jpeg */
+ if (obj->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ gst_buffer_resize (outbuf, 0, vbuffer.bytesused);
+ else
+ gst_buffer_resize (outbuf, 0, vbuffer.length);
+
+ GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
+
+ *buffer = outbuf;
+
+ return GST_FLOW_OK;
- gst_mini_object_unref (GST_MINI_OBJECT (pool));
+ /* ERRORS */
+poll_error:
+ {
+ GST_DEBUG_OBJECT (pool, "poll error %s", gst_flow_get_name (res));
+ return res;
+ }
+error:
+ {
+ GST_WARNING_OBJECT (pool,
+ "problem dequeuing 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_buffer:
+ {
+ GST_ERROR_OBJECT (pool, "No free buffer 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
- */
-GstV4l2Buffer *
-gst_v4l2_buffer_pool_get (GstV4l2BufferPool * pool, gboolean blocking)
+static GstFlowReturn
+gst_v4l2_buffer_pool_acquire_buffer (GstBufferPool * bpool, GstBuffer ** buffer,
+ GstBufferPoolAcquireParams * params)
{
- GstV4l2Buffer *buf;
+ GstFlowReturn ret;
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
+ GstV4l2Object *obj = pool->obj;
+
+ GST_DEBUG_OBJECT (pool, "acquire");
+
+ if (GST_BUFFER_POOL_IS_FLUSHING (bpool))
+ goto flushing;
+
+ switch (obj->type) {
+ case V4L2_BUF_TYPE_VIDEO_CAPTURE:
+ /* capture, This function should return a buffer with new captured data */
+ switch (obj->mode) {
+ case GST_V4L2_IO_RW:
+ /* take empty buffer from the pool */
+ ret = GST_BUFFER_POOL_CLASS (parent_class)->acquire_buffer (bpool,
+ buffer, params);
+ break;
+
+ case GST_V4L2_IO_MMAP:
+ /* just dequeue a buffer, we basically use the queue of v4l2 as the
+ * storage for our buffers. This function does poll first so we can
+ * interrupt it fine. */
+ ret = gst_v4l2_buffer_pool_dqbuf (pool, buffer);
+ if (G_UNLIKELY (ret != GST_FLOW_OK))
+ goto done;
+
+ /* start copying buffers when we are running low on buffers */
+ if (pool->num_queued < pool->copy_threshold) {
+ GstBuffer *copy;
+
+ /* copy the memory */
+ copy = gst_buffer_copy (*buffer);
+ GST_LOG_OBJECT (pool, "copy buffer %p->%p", *buffer, copy);
+
+ /* and requeue so that we can continue capturing */
+ ret = gst_v4l2_buffer_pool_qbuf (pool, *buffer);
+ *buffer = copy;
+ }
+ break;
+
+ case GST_V4L2_IO_USERPTR:
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+ break;
- if (blocking) {
- buf = g_async_queue_pop (pool->avail_buffers);
- } else {
- buf = g_async_queue_try_pop (pool->avail_buffers);
+ case V4L2_BUF_TYPE_VIDEO_OUTPUT:
+ /* playback, This function should return an empty buffer */
+ switch (obj->mode) {
+ case GST_V4L2_IO_RW:
+ /* get an empty buffer */
+ ret = GST_BUFFER_POOL_CLASS (parent_class)->acquire_buffer (bpool,
+ buffer, params);
+ break;
+
+ case GST_V4L2_IO_MMAP:
+ /* get a free unqueued buffer */
+ ret = GST_BUFFER_POOL_CLASS (parent_class)->acquire_buffer (bpool,
+ buffer, params);
+ break;
+
+ case GST_V4L2_IO_USERPTR:
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+ break;
+
+ default:
+ g_assert_not_reached ();
+ break;
}
+done:
+ return ret;
- if (buf) {
- GST_V4L2_BUFFER_POOL_LOCK (pool);
- GST_BUFFER_SIZE (buf) = buf->vbuffer.length;
- GST_BUFFER_FLAG_UNSET (buf, 0xffffffff);
- GST_V4L2_BUFFER_POOL_UNLOCK (pool);
+ /* ERRORS */
+flushing:
+ {
+ GST_DEBUG_OBJECT (pool, "We are flushing");
+ return GST_FLOW_FLUSHING;
}
+}
- pool->running = TRUE;
+static void
+gst_v4l2_buffer_pool_release_buffer (GstBufferPool * bpool, GstBuffer * buffer)
+{
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
+ GstV4l2Object *obj = pool->obj;
+
+ GST_DEBUG_OBJECT (pool, "release buffer %p", buffer);
+
+ switch (obj->type) {
+ case V4L2_BUF_TYPE_VIDEO_CAPTURE:
+ /* capture, put the buffer back in the queue so that we can refill it
+ * later. */
+ switch (obj->mode) {
+ case GST_V4L2_IO_RW:
+ /* release back in the pool */
+ GST_BUFFER_POOL_CLASS (parent_class)->release_buffer (bpool, buffer);
+ break;
+
+ case GST_V4L2_IO_MMAP:
+ /* queue back in the device */
+ gst_v4l2_buffer_pool_qbuf (pool, buffer);
+ break;
+
+ case GST_V4L2_IO_USERPTR:
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+ break;
- return buf;
-}
+ case V4L2_BUF_TYPE_VIDEO_OUTPUT:
+ switch (obj->mode) {
+ case GST_V4L2_IO_RW:
+ /* release back in the pool */
+ GST_BUFFER_POOL_CLASS (parent_class)->release_buffer (bpool, buffer);
+ break;
+
+ case GST_V4L2_IO_MMAP:
+ {
+ GstV4l2Meta *meta;
+
+ meta = GST_V4L2_META_GET (buffer);
+ g_assert (meta != NULL);
+
+ if (pool->buffers[meta->vbuffer.index] == NULL) {
+ GST_LOG_OBJECT (pool, "buffer not queued, putting on free list");
+ /* playback, put the buffer back in the queue to refill later. */
+ GST_BUFFER_POOL_CLASS (parent_class)->release_buffer (bpool,
+ buffer);
+ } else {
+ /* the buffer is queued in the device but maybe not played yet. We just
+ * leave it there and not make it available for future calls to acquire
+ * for now. The buffer will be dequeued and reused later. */
+ GST_LOG_OBJECT (pool, "buffer is queued");
+ }
+ break;
+ }
+
+ case GST_V4L2_IO_USERPTR:
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+ break;
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+}
-/**
- * gst_v4l2_buffer_pool_qbuf:
- * @pool: the pool
- * @buf: the buffer to queue
- *
- * Queue a buffer to the driver
- *
- * Returns: %TRUE for success
- */
-gboolean
-gst_v4l2_buffer_pool_qbuf (GstV4l2BufferPool * pool, GstV4l2Buffer * buf)
+static void
+gst_v4l2_buffer_pool_finalize (GObject * object)
{
- GST_LOG_OBJECT (pool->v4l2elem, "enqueue pool buffer %d", buf->vbuffer.index);
+ GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (object);
- if (v4l2_ioctl (pool->video_fd, VIDIOC_QBUF, &buf->vbuffer) < 0)
- return FALSE;
+ if (pool->video_fd >= 0)
+ v4l2_close (pool->video_fd);
+ if (pool->allocator)
+ gst_allocator_unref (pool->allocator);
+ g_free (pool->buffers);
- pool->num_live_buffers--;
- GST_DEBUG_OBJECT (pool->v4l2elem, "num_live_buffers--: %d",
- pool->num_live_buffers);
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
- return TRUE;
+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_dqbuf:
- * @pool: the pool
+ * gst_v4l2_buffer_pool_new:
+ * @obj: the v4l2 object owning the pool
*
- * 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'
+ * Construct a new buffer pool.
*
- * Returns: a buffer
+ * Returns: the new pool, use gst_object_unref() to free resources
*/
-GstV4l2Buffer *
-gst_v4l2_buffer_pool_dqbuf (GstV4l2BufferPool * pool)
+GstBufferPool *
+gst_v4l2_buffer_pool_new (GstV4l2Object * obj, GstCaps * caps)
{
- GstV4l2Object *v4l2object = get_v4l2_object (pool->v4l2elem);
- GstV4l2Buffer *pool_buffer;
- struct v4l2_buffer buffer;
+ GstV4l2BufferPool *pool;
+ GstStructure *s;
+ gint fd;
- memset (&buffer, 0x00, sizeof (buffer));
- buffer.type = pool->type;
- buffer.memory = V4L2_MEMORY_MMAP;
+ fd = v4l2_dup (obj->video_fd);
+ if (fd < 0)
+ goto dup_failed;
+ pool = (GstV4l2BufferPool *) g_object_new (GST_TYPE_V4L2_BUFFER_POOL, NULL);
+ pool->video_fd = fd;
+ pool->obj = obj;
- if (v4l2_ioctl (pool->video_fd, VIDIOC_DQBUF, &buffer) >= 0) {
+ s = gst_buffer_pool_get_config (GST_BUFFER_POOL_CAST (pool));
+ gst_buffer_pool_config_set_params (s, caps, obj->sizeimage, 2, 0);
+ gst_buffer_pool_set_config (GST_BUFFER_POOL_CAST (pool), s);
- GST_V4L2_BUFFER_POOL_LOCK (pool);
+ return GST_BUFFER_POOL (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];
+ /* ERRORS */
+dup_failed:
+ {
+ GST_DEBUG ("failed to dup fd %d (%s)", errno, g_strerror (errno));
+ return NULL;
+ }
+}
- 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;
- }
+static GstFlowReturn
+gst_v4l2_do_read (GstV4l2BufferPool * pool, GstBuffer * buf)
+{
+ GstFlowReturn res;
+ GstV4l2Object *obj = pool->obj;
+ gint amount;
+ GstMapInfo map;
+ gint toread;
- 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);
+ toread = obj->sizeimage;
- pool->num_live_buffers++;
- GST_DEBUG_OBJECT (pool->v4l2elem, "num_live_buffers++: %d",
- pool->num_live_buffers);
+ GST_LOG_OBJECT (pool, "reading %d bytes into buffer %p", toread, buf);
- /* 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_buffer_map (buf, &map, GST_MAP_WRITE);
- /* this can change at every frame, esp. with jpeg */
- GST_BUFFER_SIZE (pool_buffer) = buffer.bytesused;
+ do {
+ if ((res = gst_v4l2_object_poll (obj)) != GST_FLOW_OK)
+ goto poll_error;
- GST_V4L2_BUFFER_POOL_UNLOCK (pool);
+ amount = v4l2_read (obj->video_fd, map.data, toread);
- return pool_buffer;
- }
+ if (amount == toread) {
+ break;
+ } else if (amount == -1) {
+ if (errno == EAGAIN || errno == EINTR) {
+ continue;
+ } else
+ goto read_error;
+ } else {
+ /* short reads can happen if a signal interrupts the read */
+ continue;
+ }
+ } while (TRUE);
+ GST_LOG_OBJECT (pool, "read %d bytes", amount);
+ gst_buffer_unmap (buf, &map);
+ gst_buffer_resize (buf, 0, amount);
- 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);
+ return GST_FLOW_OK;
- 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;
+ /* ERRORS */
+poll_error:
+ {
+ GST_DEBUG ("poll error %s", gst_flow_get_name (res));
+ goto cleanup;
+ }
+read_error:
+ {
+ GST_ELEMENT_ERROR (obj->element, RESOURCE, READ,
+ (_("Error reading %d bytes from device '%s'."),
+ toread, obj->videodev), GST_ERROR_SYSTEM);
+ res = GST_FLOW_ERROR;
+ goto cleanup;
+ }
+cleanup:
+ {
+ gst_buffer_unmap (buf, &map);
+ gst_buffer_resize (buf, 0, 0);
+ return res;
}
-
- return NULL;
}
/**
- * gst_v4l2_buffer_pool_available_buffers:
- * @pool: the pool
+ * gst_v4l2_buffer_pool_process:
+ * @bpool: a #GstBufferPool
+ * @buf: a #GstBuffer
*
- * Check the number of buffers available to the driver, ie. buffers that
- * have been QBUF'd but not yet DQBUF'd.
+ * Process @buf in @bpool. For capture devices, this functions fills @buf with
+ * data from the device. For output devices, this functions send the contents of
+ * @buf to the device for playback.
*
- * Returns: the number of buffers available.
+ * Returns: %GST_FLOW_OK on success.
*/
-gint
-gst_v4l2_buffer_pool_available_buffers (GstV4l2BufferPool * pool)
+GstFlowReturn
+gst_v4l2_buffer_pool_process (GstV4l2BufferPool * pool, GstBuffer * buf)
{
- return pool->buffer_count - pool->num_live_buffers;
+ GstFlowReturn ret = GST_FLOW_OK;
+ GstBufferPool *bpool = GST_BUFFER_POOL_CAST (pool);
+ GstV4l2Object *obj = pool->obj;
+
+ GST_DEBUG_OBJECT (pool, "process buffer %p", buf);
+
+ switch (obj->type) {
+ case V4L2_BUF_TYPE_VIDEO_CAPTURE:
+ /* capture */
+ switch (obj->mode) {
+ case GST_V4L2_IO_RW:
+ /* capture into the buffer */
+ ret = gst_v4l2_do_read (pool, buf);
+ break;
+
+ case GST_V4L2_IO_MMAP:
+ {
+ GstBuffer *tmp;
+
+ if (buf->pool == bpool)
+ /* nothing, data was inside the buffer when we did _acquire() */
+ goto done;
+
+ /* buffer not from our pool, grab a frame and copy it into the target */
+ if ((ret = gst_v4l2_buffer_pool_dqbuf (pool, &tmp)) != GST_FLOW_OK)
+ goto done;
+
+ if (!gst_v4l2_object_copy (obj, buf, tmp))
+ goto copy_failed;
+
+ /* an queue the buffer again after the copy */
+ if ((ret = gst_v4l2_buffer_pool_qbuf (pool, tmp)) != GST_FLOW_OK)
+ goto done;
+ break;
+ }
+
+ case GST_V4L2_IO_USERPTR:
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+ break;
+
+ case V4L2_BUF_TYPE_VIDEO_OUTPUT:
+ /* playback */
+ switch (obj->mode) {
+ case GST_V4L2_IO_RW:
+ /* FIXME, do write() */
+ GST_WARNING_OBJECT (pool, "implement write()");
+ break;
+
+ case GST_V4L2_IO_MMAP:
+ {
+ GstBuffer *to_queue;
+
+ if (buf->pool == bpool) {
+ /* nothing, we can queue directly */
+ to_queue = buf;
+ GST_LOG_OBJECT (pool, "processing buffer from our pool");
+ } else {
+ GST_LOG_OBJECT (pool, "alloc buffer from our pool");
+ if (!gst_buffer_pool_is_active (bpool)) {
+ GstStructure *config;
+
+ /* this pool was not activated, configure and activate */
+ GST_DEBUG_OBJECT (pool, "activating pool");
+
+ config = gst_buffer_pool_get_config (bpool);
+ gst_buffer_pool_config_add_option (config,
+ GST_BUFFER_POOL_OPTION_VIDEO_META);
+ gst_buffer_pool_set_config (bpool, config);
+
+ if (!gst_buffer_pool_set_active (bpool, TRUE))
+ goto activate_failed;
+ }
+
+ /* this can block if all buffers are outstanding which would be
+ * strange because we would expect the upstream element to have
+ * allocated them and returned to us.. */
+ ret = GST_BUFFER_POOL_CLASS (parent_class)->acquire_buffer (bpool,
+ &to_queue, NULL);
+ if (ret != GST_FLOW_OK)
+ goto acquire_failed;
+
+ /* copy into it and queue */
+ if (!gst_v4l2_object_copy (obj, to_queue, buf))
+ goto copy_failed;
+ }
+
+ if ((ret = gst_v4l2_buffer_pool_qbuf (pool, to_queue)) != GST_FLOW_OK)
+ goto done;
+
+ /* if we are not streaming yet (this is the first buffer, start
+ * streaming now */
+ if (!pool->streaming)
+ if (!start_streaming (pool))
+ goto start_failed;
+
+ if (pool->num_queued == pool->num_allocated) {
+ /* all buffers are queued, try to dequeue one and release it back
+ * into the pool so that _acquire can get to it again. */
+ ret = gst_v4l2_buffer_pool_dqbuf (pool, &to_queue);
+ if (ret != GST_FLOW_OK)
+ goto done;
+
+ /* release the rendered buffer back into the pool. This wakes up any
+ * thread waiting for a buffer in _acquire() */
+ gst_v4l2_buffer_pool_release_buffer (bpool, to_queue);
+ }
+ break;
+ }
+
+ case GST_V4L2_IO_USERPTR:
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+ break;
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+done:
+ return ret;
+
+ /* ERRORS */
+activate_failed:
+ {
+ GST_ERROR_OBJECT (obj->element, "failed to activate pool");
+ return GST_FLOW_ERROR;
+ }
+acquire_failed:
+ {
+ GST_WARNING_OBJECT (obj->element, "failed to acquire a buffer: %s",
+ gst_flow_get_name (ret));
+ return ret;
+ }
+copy_failed:
+ {
+ GST_ERROR_OBJECT (obj->element, "failed to copy data");
+ return GST_FLOW_ERROR;
+ }
+start_failed:
+ {
+ GST_ERROR_OBJECT (obj->element, "failed to start streaming");
+ return GST_FLOW_ERROR;
+ }
}
projects / platform / upstream / gst-plugins-good.git / blobdiff