3 * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
4 * 2006 Edgard Lima <edgard.lima@indt.org.br>
5 * 2009 Texas Instruments, Inc - http://www.ti.com/
7 * gstv4l2bufferpool.c V4L2 buffer pool class
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Library General Public License for more details.
19 * You should have received a copy of the GNU Library General Public
20 * License along with this library; if not, write to the
21 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
22 * Boston, MA 02110-1301, USA.
30 # define _GNU_SOURCE /* O_CLOEXEC */
38 #include "gst/video/video.h"
39 #include "gst/video/gstvideometa.h"
40 #include "gst/video/gstvideopool.h"
41 #include "gst/allocators/gstdmabuf.h"
43 #include <gstv4l2bufferpool.h>
45 #include "v4l2_calls.h"
46 #include "gst/gst-i18n-plugin.h"
47 #include <gst/glib-compat-private.h>
49 GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
50 GST_DEBUG_CATEGORY_EXTERN (GST_CAT_PERFORMANCE);
51 #define GST_CAT_DEFAULT v4l2_debug
53 #define GST_V4L2_IMPORT_QUARK gst_v4l2_buffer_pool_import_quark ()
59 #define gst_v4l2_buffer_pool_parent_class parent_class
60 G_DEFINE_TYPE (GstV4l2BufferPool, gst_v4l2_buffer_pool, GST_TYPE_BUFFER_POOL);
62 enum _GstV4l2BufferPoolAcquireFlags
64 GST_V4L2_BUFFER_POOL_ACQUIRE_FLAG_RESURRECT =
65 GST_BUFFER_POOL_ACQUIRE_FLAG_LAST,
66 GST_V4L2_BUFFER_POOL_ACQUIRE_FLAG_LAST
69 static void gst_v4l2_buffer_pool_release_buffer (GstBufferPool * bpool,
73 gst_v4l2_is_buffer_valid (GstBuffer * buffer, GstV4l2MemoryGroup ** out_group)
75 GstMemory *mem = gst_buffer_peek_memory (buffer, 0);
76 gboolean valid = FALSE;
78 if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY))
81 if (gst_is_dmabuf_memory (mem))
82 mem = gst_mini_object_get_qdata (GST_MINI_OBJECT (mem),
83 GST_V4L2_MEMORY_QUARK);
85 if (mem && gst_is_v4l2_memory (mem)) {
86 GstV4l2Memory *vmem = (GstV4l2Memory *) mem;
87 GstV4l2MemoryGroup *group = vmem->group;
90 if (group->n_mem != gst_buffer_n_memory (buffer))
93 for (i = 0; i < group->n_mem; i++) {
94 if (group->mem[i] != gst_buffer_peek_memory (buffer, i))
97 if (!gst_memory_is_writable (group->mem[i]))
111 gst_v4l2_buffer_pool_copy_buffer (GstV4l2BufferPool * pool, GstBuffer * dest,
114 const GstVideoFormatInfo *finfo = pool->caps_info.finfo;
116 GST_LOG_OBJECT (pool, "copying buffer");
118 if (finfo && (finfo->format != GST_VIDEO_FORMAT_UNKNOWN &&
119 finfo->format != GST_VIDEO_FORMAT_ENCODED)) {
120 GstVideoFrame src_frame, dest_frame;
122 GST_DEBUG_OBJECT (pool, "copy video frame");
124 /* we have raw video, use videoframe copy to get strides right */
125 if (!gst_video_frame_map (&src_frame, &pool->caps_info, src, GST_MAP_READ))
128 if (!gst_video_frame_map (&dest_frame, &pool->caps_info, dest,
130 gst_video_frame_unmap (&src_frame);
134 gst_video_frame_copy (&dest_frame, &src_frame);
136 gst_video_frame_unmap (&src_frame);
137 gst_video_frame_unmap (&dest_frame);
141 GST_DEBUG_OBJECT (pool, "copy raw bytes");
143 if (!gst_buffer_map (src, &map, GST_MAP_READ))
146 gst_buffer_fill (dest, 0, map.data, gst_buffer_get_size (src));
148 gst_buffer_unmap (src, &map);
149 gst_buffer_resize (dest, 0, gst_buffer_get_size (src));
152 GST_CAT_LOG_OBJECT (GST_CAT_PERFORMANCE, pool, "slow copy into buffer %p",
159 GST_ERROR_OBJECT (pool, "could not map buffer");
160 return GST_FLOW_ERROR;
173 gst_v4l2_buffer_pool_import_quark (void)
175 static GQuark quark = 0;
178 quark = g_quark_from_string ("GstV4l2BufferPoolUsePtrData");
184 _unmap_userptr_frame (struct UserPtrData *data)
187 gst_video_frame_unmap (&data->frame);
189 gst_buffer_unmap (data->buffer, &data->map);
192 gst_buffer_unref (data->buffer);
194 g_slice_free (struct UserPtrData, data);
198 gst_v4l2_buffer_pool_import_userptr (GstV4l2BufferPool * pool,
199 GstBuffer * dest, GstBuffer * src)
201 GstFlowReturn ret = GST_FLOW_OK;
202 GstV4l2MemoryGroup *group = NULL;
204 const GstVideoFormatInfo *finfo = pool->caps_info.finfo;
205 struct UserPtrData *data = NULL;
207 GST_LOG_OBJECT (pool, "importing userptr");
210 if (!gst_v4l2_is_buffer_valid (dest, &group))
213 if (V4L2_TYPE_IS_OUTPUT (pool->obj->type))
214 flags = GST_MAP_READ;
216 flags = GST_MAP_WRITE;
218 data = g_slice_new0 (struct UserPtrData);
220 if (finfo && (finfo->format != GST_VIDEO_FORMAT_UNKNOWN &&
221 finfo->format != GST_VIDEO_FORMAT_ENCODED)) {
222 data->is_frame = TRUE;
224 if (!gst_video_frame_map (&data->frame, &pool->caps_info, src, flags))
227 if (!gst_v4l2_allocator_import_userptr (pool->vallocator, group,
228 data->frame.info.size, finfo->n_planes, data->frame.data,
229 data->frame.info.offset))
232 gsize offset[1] = { 0 };
235 data->is_frame = FALSE;
237 if (!gst_buffer_map (src, &data->map, flags))
240 ptr[0] = data->map.data;
242 if (!gst_v4l2_allocator_import_userptr (pool->vallocator, group,
243 data->map.size, 1, ptr, offset))
247 data->buffer = gst_buffer_ref (src);
249 gst_mini_object_set_qdata (GST_MINI_OBJECT (dest), GST_V4L2_IMPORT_QUARK,
250 data, (GDestroyNotify) _unmap_userptr_frame);
256 GST_ERROR_OBJECT (pool, "destination buffer invalid or not from our pool");
257 return GST_FLOW_ERROR;
261 GST_ERROR_OBJECT (pool, "could not map buffer");
262 g_slice_free (struct UserPtrData, data);
263 return GST_FLOW_ERROR;
267 GST_ERROR_OBJECT (pool, "failed to import data");
268 _unmap_userptr_frame (data);
269 return GST_FLOW_ERROR;
274 gst_v4l2_buffer_pool_import_dmabuf (GstV4l2BufferPool * pool,
275 GstBuffer * dest, GstBuffer * src)
277 GstV4l2MemoryGroup *group = NULL;
278 GstMemory *dma_mem[GST_VIDEO_MAX_PLANES] = { 0 };
279 guint n_mem = gst_buffer_n_memory (src);
282 GST_LOG_OBJECT (pool, "importing dmabuf");
284 if (!gst_v4l2_is_buffer_valid (dest, &group))
287 if (n_mem > GST_VIDEO_MAX_PLANES)
290 for (i = 0; i < n_mem; i++)
291 dma_mem[i] = gst_buffer_peek_memory (src, i);
293 if (!gst_v4l2_allocator_import_dmabuf (pool->vallocator, group, n_mem,
297 gst_mini_object_set_qdata (GST_MINI_OBJECT (dest), GST_V4L2_IMPORT_QUARK,
298 gst_buffer_ref (src), (GDestroyNotify) gst_buffer_unref);
304 GST_ERROR_OBJECT (pool, "destination buffer invalid or not from our pool");
305 return GST_FLOW_ERROR;
309 GST_ERROR_OBJECT (pool, "could not map buffer");
310 return GST_FLOW_ERROR;
314 GST_ERROR_OBJECT (pool, "failed to import dmabuf");
315 return GST_FLOW_ERROR;
320 gst_v4l2_buffer_pool_prepare_buffer (GstV4l2BufferPool * pool,
321 GstBuffer * dest, GstBuffer * src)
323 GstFlowReturn ret = GST_FLOW_OK;
324 gboolean own_src = FALSE;
327 if (pool->other_pool == NULL) {
328 GST_ERROR_OBJECT (pool, "can't prepare buffer, source buffer missing");
329 return GST_FLOW_ERROR;
332 ret = gst_buffer_pool_acquire_buffer (pool->other_pool, &src, NULL);
333 if (ret != GST_FLOW_OK) {
334 GST_ERROR_OBJECT (pool, "failed to acquire buffer from downstream pool");
341 switch (pool->obj->mode) {
342 case GST_V4L2_IO_MMAP:
343 case GST_V4L2_IO_DMABUF:
344 ret = gst_v4l2_buffer_pool_copy_buffer (pool, dest, src);
346 case GST_V4L2_IO_USERPTR:
347 ret = gst_v4l2_buffer_pool_import_userptr (pool, dest, src);
349 case GST_V4L2_IO_DMABUF_IMPORT:
350 ret = gst_v4l2_buffer_pool_import_dmabuf (pool, dest, src);
357 gst_buffer_unref (src);
364 gst_v4l2_buffer_pool_alloc_buffer (GstBufferPool * bpool, GstBuffer ** buffer,
365 GstBufferPoolAcquireParams * params)
367 GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
368 GstV4l2MemoryGroup *group = NULL;
369 GstBuffer *newbuf = NULL;
379 gst_buffer_new_allocate (pool->allocator, pool->size, &pool->params);
381 case GST_V4L2_IO_MMAP:
382 group = gst_v4l2_allocator_alloc_mmap (pool->vallocator);
384 case GST_V4L2_IO_DMABUF:
385 group = gst_v4l2_allocator_alloc_dmabuf (pool->vallocator,
388 case GST_V4L2_IO_USERPTR:
389 group = gst_v4l2_allocator_alloc_userptr (pool->vallocator);
391 case GST_V4L2_IO_DMABUF_IMPORT:
392 group = gst_v4l2_allocator_alloc_dmabufin (pool->vallocator);
396 g_assert_not_reached ();
402 newbuf = gst_buffer_new ();
404 for (i = 0; i < group->n_mem; i++)
405 gst_buffer_append_memory (newbuf, group->mem[i]);
406 } else if (newbuf == NULL) {
407 goto allocation_failed;
410 /* add metadata to raw video buffers */
411 if (pool->add_videometa)
412 gst_buffer_add_video_meta_full (newbuf, GST_VIDEO_FRAME_FLAG_NONE,
413 GST_VIDEO_INFO_FORMAT (info), GST_VIDEO_INFO_WIDTH (info),
414 GST_VIDEO_INFO_HEIGHT (info), GST_VIDEO_INFO_N_PLANES (info),
415 info->offset, info->stride);
424 GST_ERROR_OBJECT (pool, "failed to allocate buffer");
425 return GST_FLOW_ERROR;
430 gst_v4l2_buffer_pool_set_config (GstBufferPool * bpool, GstStructure * config)
432 GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
433 GstV4l2Object *obj = pool->obj;
435 guint size, min_buffers, max_buffers;
436 GstAllocator *allocator;
437 GstAllocationParams params;
438 gboolean can_allocate = FALSE;
439 gboolean updated = FALSE;
442 pool->add_videometa =
443 gst_buffer_pool_config_has_option (config,
444 GST_BUFFER_POOL_OPTION_VIDEO_META);
446 /* parse the config and keep around */
447 if (!gst_buffer_pool_config_get_params (config, &caps, &size, &min_buffers,
451 if (!gst_buffer_pool_config_get_allocator (config, &allocator, ¶ms))
454 GST_DEBUG_OBJECT (pool, "config %" GST_PTR_FORMAT, config);
457 gst_object_unref (pool->allocator);
458 pool->allocator = NULL;
461 case GST_V4L2_IO_DMABUF:
462 pool->allocator = gst_dmabuf_allocator_new ();
463 can_allocate = GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, MMAP);
465 case GST_V4L2_IO_MMAP:
466 can_allocate = GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, MMAP);
468 case GST_V4L2_IO_USERPTR:
470 GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, USERPTR);
472 case GST_V4L2_IO_DMABUF_IMPORT:
473 can_allocate = GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, DMABUF);
477 pool->allocator = g_object_ref (allocator);
478 pool->params = params;
479 /* No need to change the configuration */
483 g_assert_not_reached ();
487 if (min_buffers < GST_V4L2_MIN_BUFFERS) {
489 min_buffers = GST_V4L2_MIN_BUFFERS;
490 GST_INFO_OBJECT (pool, "increasing minimum buffers to %u", min_buffers);
493 if (max_buffers > VIDEO_MAX_FRAME || max_buffers == 0) {
495 max_buffers = VIDEO_MAX_FRAME;
496 GST_INFO_OBJECT (pool, "reducing maximum buffers to %u", max_buffers);
499 if (min_buffers > max_buffers) {
501 min_buffers = max_buffers;
502 GST_INFO_OBJECT (pool, "reducing minimum buffers to %u", min_buffers);
503 } else if (min_buffers != max_buffers) {
506 max_buffers = min_buffers;
507 GST_INFO_OBJECT (pool, "can't allocate, setting maximum to minimum");
511 if (!pool->add_videometa && obj->need_video_meta) {
512 GST_INFO_OBJECT (pool, "adding needed video meta");
514 gst_buffer_pool_config_add_option (config,
515 GST_BUFFER_POOL_OPTION_VIDEO_META);
519 gst_buffer_pool_config_set_params (config, caps, size, min_buffers,
522 /* keep a GstVideoInfo with defaults for the when we need to copy */
523 gst_video_info_from_caps (&pool->caps_info, caps);
526 ret = GST_BUFFER_POOL_CLASS (parent_class)->set_config (bpool, config);
528 /* If anything was changed documentation recommand to return FALSE */
529 return !updated && ret;
534 GST_ERROR_OBJECT (pool, "invalid config %" GST_PTR_FORMAT, config);
540 gst_v4l2_buffer_pool_streamon (GstV4l2BufferPool * pool)
542 GstV4l2Object *obj = pool->obj;
545 case GST_V4L2_IO_MMAP:
546 case GST_V4L2_IO_USERPTR:
547 case GST_V4L2_IO_DMABUF:
548 case GST_V4L2_IO_DMABUF_IMPORT:
549 if (!pool->streaming) {
550 if (v4l2_ioctl (pool->video_fd, VIDIOC_STREAMON, &obj->type) < 0)
551 goto streamon_failed;
553 pool->streaming = TRUE;
555 GST_DEBUG_OBJECT (pool, "Started streaming");
566 GST_ERROR_OBJECT (pool, "error with STREAMON %d (%s)", errno,
573 gst_v4l2_buffer_pool_streamoff (GstV4l2BufferPool * pool)
575 GstV4l2Object *obj = pool->obj;
578 case GST_V4L2_IO_MMAP:
579 case GST_V4L2_IO_USERPTR:
580 case GST_V4L2_IO_DMABUF:
581 case GST_V4L2_IO_DMABUF_IMPORT:
582 if (pool->streaming) {
583 if (v4l2_ioctl (pool->video_fd, VIDIOC_STREAMOFF, &obj->type) < 0)
584 goto streamoff_failed;
586 pool->streaming = FALSE;
588 GST_DEBUG_OBJECT (pool, "Stopped streaming");
599 GST_ERROR_OBJECT (pool, "error with STREAMOFF %d (%s)", errno,
606 gst_v4l2_buffer_pool_resurect_buffer (GstV4l2BufferPool * pool)
608 GstBufferPoolAcquireParams params = { 0 };
609 GstBuffer *buffer = NULL;
612 GST_DEBUG_OBJECT (pool, "A buffer was lost, reallocating it");
615 (GstBufferPoolAcquireFlags) GST_V4L2_BUFFER_POOL_ACQUIRE_FLAG_RESURRECT;
617 gst_buffer_pool_acquire_buffer (GST_BUFFER_POOL (pool), &buffer, ¶ms);
619 if (ret == GST_FLOW_OK)
620 gst_buffer_unref (buffer);
626 gst_v4l2_buffer_pool_start (GstBufferPool * bpool)
628 GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
629 GstBufferPoolClass *pclass = GST_BUFFER_POOL_CLASS (parent_class);
630 GstV4l2Object *obj = pool->obj;
631 GstStructure *config;
633 guint size, min_buffers, max_buffers;
634 guint max_latency, min_latency, copy_threshold = 0;
635 gboolean can_allocate = FALSE;
637 GST_DEBUG_OBJECT (pool, "activating pool");
639 config = gst_buffer_pool_get_config (bpool);
640 if (!gst_buffer_pool_config_get_params (config, &caps, &size, &min_buffers,
644 min_latency = MAX (GST_V4L2_MIN_BUFFERS, obj->min_buffers);
650 /* This workaround a unfixable bug in libv4l2 when RW is emulated on top
651 * of MMAP. In this case, the first read initialize the queues, but the
652 * poll before that will always fail. Doing an empty read, forces the
653 * queue to be initialized now. We only do this if we have a streaming
655 if (obj->vcap.capabilities & V4L2_CAP_STREAMING)
656 v4l2_read (obj->video_fd, NULL, 0);
659 case GST_V4L2_IO_DMABUF:
660 case GST_V4L2_IO_MMAP:
664 can_allocate = GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, MMAP);
666 /* first, lets request buffers, and see how many we can get: */
667 GST_DEBUG_OBJECT (pool, "requesting %d MMAP buffers", min_buffers);
669 count = gst_v4l2_allocator_start (pool->vallocator, min_buffers,
672 if (count < GST_V4L2_MIN_BUFFERS) {
677 /* V4L2 buffer pool are often very limited in the amount of buffers it
678 * can offer. The copy_threshold will workaround this limitation by
679 * falling back to copy if the pipeline needed more buffers. This also
680 * prevent having to do REQBUFS(N)/REQBUFS(0) everytime configure is
682 if (count != min_buffers) {
683 GST_WARNING_OBJECT (pool, "using %u buffers instead of %u",
686 copy_threshold = min_latency;
688 /* The initial minimum could be provide either by GstBufferPool or
695 case GST_V4L2_IO_USERPTR:
700 GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, USERPTR);
702 GST_DEBUG_OBJECT (pool, "requesting %d USERPTR buffers", min_buffers);
704 count = gst_v4l2_allocator_start (pool->vallocator, min_buffers,
705 V4L2_MEMORY_USERPTR);
707 /* There is no rational to not get what we asked */
708 if (count < min_buffers) {
716 case GST_V4L2_IO_DMABUF_IMPORT:
720 can_allocate = GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, DMABUF);
722 GST_DEBUG_OBJECT (pool, "requesting %d DMABUF buffers", min_buffers);
724 count = gst_v4l2_allocator_start (pool->vallocator, min_buffers,
727 /* There is no rational to not get what we asked */
728 if (count < min_buffers) {
739 g_assert_not_reached ();
744 max_latency = max_buffers;
746 max_latency = min_buffers;
749 pool->copy_threshold = copy_threshold;
750 pool->max_latency = max_latency;
751 pool->min_latency = min_latency;
752 pool->num_queued = 0;
754 if (max_buffers != 0 && max_buffers < min_buffers)
755 max_buffers = min_buffers;
757 gst_buffer_pool_config_set_params (config, caps, size, min_buffers,
759 pclass->set_config (bpool, config);
760 gst_structure_free (config);
762 if (pool->other_pool)
763 if (!gst_buffer_pool_set_active (pool->other_pool, TRUE))
764 goto other_pool_failed;
766 /* now, allocate the buffers: */
767 if (!pclass->start (bpool))
770 if (!V4L2_TYPE_IS_OUTPUT (obj->type))
771 pool->group_released_handler =
772 g_signal_connect_swapped (pool->vallocator, "group-released",
773 G_CALLBACK (gst_v4l2_buffer_pool_resurect_buffer), pool);
780 GST_ERROR_OBJECT (pool, "invalid config %" GST_PTR_FORMAT, config);
781 gst_structure_free (config);
786 GST_ERROR_OBJECT (pool,
787 "we received %d buffer from device '%s', we want at least %d",
788 min_buffers, obj->videodev, GST_V4L2_MIN_BUFFERS);
789 gst_structure_free (config);
794 GST_ERROR_OBJECT (pool, "failed to start streaming");
799 GST_ERROR_OBJECT (pool, "failed to active the other pool %"
800 GST_PTR_FORMAT, pool->other_pool);
806 gst_v4l2_buffer_pool_stop (GstBufferPool * bpool)
808 GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
809 GstBufferPoolClass *pclass = GST_BUFFER_POOL_CLASS (parent_class);
813 GST_DEBUG_OBJECT (pool, "stopping pool");
815 if (pool->group_released_handler > 0) {
816 g_signal_handler_disconnect (pool->vallocator,
817 pool->group_released_handler);
818 pool->group_released_handler = 0;
821 if (pool->other_pool) {
822 gst_object_unref (pool->other_pool);
823 pool->other_pool = NULL;
826 if (!gst_v4l2_buffer_pool_streamoff (pool))
827 goto streamoff_failed;
829 if (pool->vallocator)
830 gst_v4l2_allocator_flush (pool->vallocator);
832 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
833 if (pool->buffers[i]) {
834 GstBuffer *buffer = pool->buffers[i];
836 pool->buffers[i] = NULL;
838 if (V4L2_TYPE_IS_OUTPUT (pool->obj->type))
839 gst_buffer_unref (buffer);
841 pclass->release_buffer (bpool, buffer);
843 g_atomic_int_add (&pool->num_queued, -1);
847 ret = GST_BUFFER_POOL_CLASS (parent_class)->stop (bpool);
849 if (ret && pool->vallocator) {
852 vret = gst_v4l2_allocator_stop (pool->vallocator);
854 if (vret == GST_V4L2_BUSY)
855 GST_WARNING_OBJECT (pool, "some buffers are still outstanding");
857 ret = (vret == GST_V4L2_OK);
864 GST_ERROR_OBJECT (pool, "device refused to stop streaming");
869 gst_v4l2_buffer_pool_flush_start (GstBufferPool * bpool)
871 GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
873 GST_DEBUG_OBJECT (pool, "start flushing");
875 gst_poll_set_flushing (pool->poll, TRUE);
877 GST_OBJECT_LOCK (pool);
879 g_cond_broadcast (&pool->empty_cond);
880 GST_OBJECT_UNLOCK (pool);
882 if (pool->other_pool)
883 gst_buffer_pool_set_flushing (pool->other_pool, TRUE);
887 gst_v4l2_buffer_pool_flush_stop (GstBufferPool * bpool)
889 GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
890 GstV4l2Object *obj = pool->obj;
893 GST_DEBUG_OBJECT (pool, "stop flushing");
895 /* If we haven't started streaming yet, simply call streamon */
896 if (!pool->streaming)
899 if (pool->other_pool)
900 gst_buffer_pool_set_flushing (pool->other_pool, FALSE);
902 if (!gst_v4l2_buffer_pool_streamoff (pool))
905 gst_v4l2_allocator_flush (pool->vallocator);
907 /* Reset our state */
911 case GST_V4L2_IO_MMAP:
912 case GST_V4L2_IO_USERPTR:
913 case GST_V4L2_IO_DMABUF:
914 case GST_V4L2_IO_DMABUF_IMPORT:
918 num_allocated = gst_v4l2_allocator_num_allocated (pool->vallocator);
920 for (i = 0; i < num_allocated; i++) {
921 /* Re-enqueue buffers */
922 if (pool->buffers[i]) {
923 GstBufferPool *bpool = (GstBufferPool *) pool;
924 GstBuffer *buffer = pool->buffers[i];
926 pool->buffers[i] = NULL;
928 /* Remove qdata, this will unmap any map data in
929 * userptr/dmabuf-import */
930 gst_mini_object_set_qdata (GST_MINI_OBJECT (buffer),
931 GST_V4L2_IMPORT_QUARK, NULL, NULL);
933 if (V4L2_TYPE_IS_OUTPUT (obj->type))
934 gst_buffer_unref (buffer);
936 gst_v4l2_buffer_pool_release_buffer (bpool, buffer);
938 g_atomic_int_add (&pool->num_queued, -1);
945 g_assert_not_reached ();
950 /* Start streaming on capture device only */
951 if (!V4L2_TYPE_IS_OUTPUT (obj->type))
952 gst_v4l2_buffer_pool_streamon (pool);
954 gst_poll_set_flushing (pool->poll, FALSE);
961 GST_ERROR_OBJECT (pool, "device refused to flush");
966 gst_v4l2_buffer_pool_poll (GstV4l2BufferPool * pool)
970 /* In RW mode there is no queue, hence no need to wait while the queue is
972 if (pool->obj->mode != GST_V4L2_IO_RW) {
973 GST_OBJECT_LOCK (pool);
975 g_cond_wait (&pool->empty_cond, GST_OBJECT_GET_LOCK (pool));
976 GST_OBJECT_UNLOCK (pool);
979 if (!pool->can_poll_device)
982 GST_LOG_OBJECT (pool, "polling device");
985 ret = gst_poll_wait (pool->poll, GST_CLOCK_TIME_NONE);
986 if (G_UNLIKELY (ret < 0)) {
994 GST_WARNING_OBJECT (pool,
995 "v4l2 device doesn't support polling. Disabling"
996 " using libv4l2 in this case may cause deadlocks");
997 pool->can_poll_device = FALSE;
1004 if (gst_poll_fd_has_error (pool->poll, &pool->pollfd))
1013 GST_DEBUG_OBJECT (pool, "stop called");
1014 return GST_FLOW_FLUSHING;
1018 GST_ELEMENT_ERROR (pool->obj->element, RESOURCE, READ, (NULL),
1019 ("poll error %d: %s (%d)", ret, g_strerror (errno), errno));
1020 return GST_FLOW_ERROR;
1024 static GstFlowReturn
1025 gst_v4l2_buffer_pool_qbuf (GstV4l2BufferPool * pool, GstBuffer * buf)
1027 GstV4l2MemoryGroup *group = NULL;
1030 if (!gst_v4l2_is_buffer_valid (buf, &group)) {
1031 GST_LOG_OBJECT (pool, "unref copied/invalid buffer %p", buf);
1032 gst_buffer_unref (buf);
1036 index = group->buffer.index;
1038 if (pool->buffers[index] != NULL)
1039 goto already_queued;
1041 GST_LOG_OBJECT (pool, "queuing buffer %i", index);
1043 g_atomic_int_inc (&pool->num_queued);
1044 pool->buffers[index] = buf;
1046 if (!gst_v4l2_allocator_qbuf (pool->vallocator, group))
1049 GST_OBJECT_LOCK (pool);
1050 pool->empty = FALSE;
1051 g_cond_signal (&pool->empty_cond);
1052 GST_OBJECT_UNLOCK (pool);
1058 GST_ERROR_OBJECT (pool, "the buffer %i was already queued", index);
1059 return GST_FLOW_ERROR;
1063 GST_ERROR_OBJECT (pool, "could not queue a buffer %i", index);
1064 /* Mark broken buffer to the allocator */
1065 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_TAG_MEMORY);
1066 g_atomic_int_add (&pool->num_queued, -1);
1067 pool->buffers[index] = NULL;
1068 return GST_FLOW_ERROR;
1072 static GstFlowReturn
1073 gst_v4l2_buffer_pool_dqbuf (GstV4l2BufferPool * pool, GstBuffer ** buffer)
1077 GstV4l2Object *obj = pool->obj;
1078 GstClockTime timestamp;
1079 GstV4l2MemoryGroup *group;
1082 if ((res = gst_v4l2_buffer_pool_poll (pool)) != GST_FLOW_OK)
1085 GST_LOG_OBJECT (pool, "dequeueing a buffer");
1087 group = gst_v4l2_allocator_dqbuf (pool->vallocator);
1091 /* get our GstBuffer with that index from the pool, if the buffer was
1092 * outstanding we have a serious problem.
1094 outbuf = pool->buffers[group->buffer.index];
1098 /* mark the buffer outstanding */
1099 pool->buffers[group->buffer.index] = NULL;
1100 if (g_atomic_int_dec_and_test (&pool->num_queued)) {
1101 GST_OBJECT_LOCK (pool);
1103 GST_OBJECT_UNLOCK (pool);
1106 timestamp = GST_TIMEVAL_TO_TIME (group->buffer.timestamp);
1108 #ifndef GST_DISABLE_GST_DEBUG
1109 for (i = 0; i < group->n_mem; i++) {
1110 GST_LOG_OBJECT (pool,
1111 "dequeued buffer %p seq:%d (ix=%d), mem %p used %d, plane=%d, flags %08x, ts %"
1112 GST_TIME_FORMAT ", pool-queued=%d, buffer=%p", outbuf,
1113 group->buffer.sequence, group->buffer.index, group->mem[i],
1114 group->planes[i].bytesused, i, group->buffer.flags,
1115 GST_TIME_ARGS (timestamp), pool->num_queued, outbuf);
1119 /* set top/bottom field first if v4l2_buffer has the information */
1120 switch (group->buffer.field) {
1121 case V4L2_FIELD_NONE:
1122 GST_BUFFER_FLAG_UNSET (outbuf, GST_VIDEO_BUFFER_FLAG_INTERLACED);
1123 GST_BUFFER_FLAG_UNSET (outbuf, GST_VIDEO_BUFFER_FLAG_TFF);
1125 case V4L2_FIELD_INTERLACED_TB:
1126 GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_INTERLACED);
1127 GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_TFF);
1129 case V4L2_FIELD_INTERLACED_BT:
1130 GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_INTERLACED);
1131 GST_BUFFER_FLAG_UNSET (outbuf, GST_VIDEO_BUFFER_FLAG_TFF);
1134 GST_BUFFER_FLAG_UNSET (outbuf, GST_VIDEO_BUFFER_FLAG_INTERLACED);
1135 GST_BUFFER_FLAG_UNSET (outbuf, GST_VIDEO_BUFFER_FLAG_TFF);
1136 GST_FIXME_OBJECT (pool,
1137 "Unhandled enum v4l2_field %d - treating as progressive",
1138 group->buffer.field);
1141 if (GST_VIDEO_INFO_FORMAT (&obj->info) == GST_VIDEO_FORMAT_ENCODED) {
1142 if (group->buffer.flags & V4L2_BUF_FLAG_KEYFRAME)
1143 GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
1145 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
1148 if (group->buffer.flags & V4L2_BUF_FLAG_ERROR)
1149 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_CORRUPTED);
1151 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
1160 GST_DEBUG_OBJECT (pool, "poll error %s", gst_flow_get_name (res));
1165 return GST_FLOW_ERROR;
1169 GST_ERROR_OBJECT (pool, "No free buffer found in the pool at index %d.",
1170 group->buffer.index);
1171 return GST_FLOW_ERROR;
1175 static GstFlowReturn
1176 gst_v4l2_buffer_pool_acquire_buffer (GstBufferPool * bpool, GstBuffer ** buffer,
1177 GstBufferPoolAcquireParams * params)
1180 GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
1181 GstBufferPoolClass *pclass = GST_BUFFER_POOL_CLASS (parent_class);
1182 GstV4l2Object *obj = pool->obj;
1184 GST_DEBUG_OBJECT (pool, "acquire");
1186 /* If this is being called to resurect a lost buffer */
1187 if (params && params->flags & GST_V4L2_BUFFER_POOL_ACQUIRE_FLAG_RESURRECT) {
1188 ret = pclass->acquire_buffer (bpool, buffer, params);
1192 switch (obj->type) {
1193 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1194 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
1195 /* capture, This function should return a buffer with new captured data */
1196 switch (obj->mode) {
1197 case GST_V4L2_IO_RW:
1199 /* take empty buffer from the pool */
1200 ret = pclass->acquire_buffer (bpool, buffer, params);
1203 case GST_V4L2_IO_DMABUF:
1204 case GST_V4L2_IO_MMAP:
1205 case GST_V4L2_IO_USERPTR:
1206 case GST_V4L2_IO_DMABUF_IMPORT:
1208 /* just dequeue a buffer, we basically use the queue of v4l2 as the
1209 * storage for our buffers. This function does poll first so we can
1210 * interrupt it fine. */
1211 ret = gst_v4l2_buffer_pool_dqbuf (pool, buffer);
1215 ret = GST_FLOW_ERROR;
1216 g_assert_not_reached ();
1222 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1223 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
1224 /* playback, This function should return an empty buffer */
1225 switch (obj->mode) {
1226 case GST_V4L2_IO_RW:
1227 /* get an empty buffer */
1228 ret = pclass->acquire_buffer (bpool, buffer, params);
1231 case GST_V4L2_IO_MMAP:
1232 case GST_V4L2_IO_DMABUF:
1233 case GST_V4L2_IO_USERPTR:
1234 case GST_V4L2_IO_DMABUF_IMPORT:
1235 /* get a free unqueued buffer */
1236 ret = pclass->acquire_buffer (bpool, buffer, params);
1240 ret = GST_FLOW_ERROR;
1241 g_assert_not_reached ();
1247 ret = GST_FLOW_ERROR;
1248 g_assert_not_reached ();
1256 gst_v4l2_buffer_pool_release_buffer (GstBufferPool * bpool, GstBuffer * buffer)
1258 GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
1259 GstBufferPoolClass *pclass = GST_BUFFER_POOL_CLASS (parent_class);
1260 GstV4l2Object *obj = pool->obj;
1262 GST_DEBUG_OBJECT (pool, "release buffer %p", buffer);
1264 switch (obj->type) {
1265 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1266 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
1267 /* capture, put the buffer back in the queue so that we can refill it
1269 switch (obj->mode) {
1270 case GST_V4L2_IO_RW:
1271 /* release back in the pool */
1272 pclass->release_buffer (bpool, buffer);
1275 case GST_V4L2_IO_DMABUF:
1276 case GST_V4L2_IO_MMAP:
1277 case GST_V4L2_IO_USERPTR:
1278 case GST_V4L2_IO_DMABUF_IMPORT:
1280 if (gst_v4l2_is_buffer_valid (buffer, NULL)) {
1281 /* queue back in the device */
1282 if (pool->other_pool)
1283 gst_v4l2_buffer_pool_prepare_buffer (pool, buffer, NULL);
1284 if (gst_v4l2_buffer_pool_qbuf (pool, buffer) != GST_FLOW_OK)
1285 pclass->release_buffer (bpool, buffer);
1287 /* Simply release invalide/modified buffer, the allocator will
1288 * give it back later */
1289 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
1290 pclass->release_buffer (bpool, buffer);
1295 g_assert_not_reached ();
1300 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1301 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
1302 switch (obj->mode) {
1303 case GST_V4L2_IO_RW:
1304 /* release back in the pool */
1305 pclass->release_buffer (bpool, buffer);
1308 case GST_V4L2_IO_MMAP:
1309 case GST_V4L2_IO_DMABUF:
1310 case GST_V4L2_IO_USERPTR:
1311 case GST_V4L2_IO_DMABUF_IMPORT:
1313 GstV4l2MemoryGroup *group;
1316 if (!gst_v4l2_is_buffer_valid (buffer, &group)) {
1317 /* Simply release invalide/modified buffer, the allocator will
1318 * give it back later */
1319 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
1320 pclass->release_buffer (bpool, buffer);
1324 index = group->buffer.index;
1326 if (pool->buffers[index] == NULL) {
1327 GST_LOG_OBJECT (pool, "buffer %u not queued, putting on free list",
1330 /* Remove qdata, this will unmap any map data in userptr */
1331 gst_mini_object_set_qdata (GST_MINI_OBJECT (buffer),
1332 GST_V4L2_IMPORT_QUARK, NULL, NULL);
1334 /* reset to default size */
1335 gst_v4l2_allocator_reset_group (pool->vallocator, group);
1337 /* playback, put the buffer back in the queue to refill later. */
1338 pclass->release_buffer (bpool, buffer);
1340 /* We keep a ref on queued buffer, so this should never happen */
1341 g_assert_not_reached ();
1347 g_assert_not_reached ();
1353 g_assert_not_reached ();
1359 gst_v4l2_buffer_pool_dispose (GObject * object)
1361 GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (object);
1364 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1365 if (pool->buffers[i])
1366 gst_buffer_replace (&(pool->buffers[i]), NULL);
1369 if (pool->vallocator)
1370 gst_object_unref (pool->vallocator);
1371 pool->vallocator = NULL;
1373 if (pool->allocator)
1374 gst_object_unref (pool->allocator);
1375 pool->allocator = NULL;
1377 if (pool->other_pool)
1378 gst_object_unref (pool->other_pool);
1379 pool->other_pool = NULL;
1381 G_OBJECT_CLASS (parent_class)->dispose (object);
1385 gst_v4l2_buffer_pool_finalize (GObject * object)
1387 GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (object);
1389 if (pool->video_fd >= 0)
1390 v4l2_close (pool->video_fd);
1392 gst_poll_free (pool->poll);
1394 /* FIXME Is this required to keep around ?
1395 * This can't be done in dispose method because we must not set pointer
1396 * to NULL as it is part of the v4l2object and dispose could be called
1398 gst_object_unref (pool->obj->element);
1400 g_cond_clear (&pool->empty_cond);
1402 /* FIXME have we done enough here ? */
1404 G_OBJECT_CLASS (parent_class)->finalize (object);
1408 gst_v4l2_buffer_pool_init (GstV4l2BufferPool * pool)
1410 pool->poll = gst_poll_new (TRUE);
1411 pool->can_poll_device = TRUE;
1412 g_cond_init (&pool->empty_cond);
1417 gst_v4l2_buffer_pool_class_init (GstV4l2BufferPoolClass * klass)
1419 GObjectClass *object_class = G_OBJECT_CLASS (klass);
1420 GstBufferPoolClass *bufferpool_class = GST_BUFFER_POOL_CLASS (klass);
1422 object_class->dispose = gst_v4l2_buffer_pool_dispose;
1423 object_class->finalize = gst_v4l2_buffer_pool_finalize;
1425 bufferpool_class->start = gst_v4l2_buffer_pool_start;
1426 bufferpool_class->stop = gst_v4l2_buffer_pool_stop;
1427 bufferpool_class->set_config = gst_v4l2_buffer_pool_set_config;
1428 bufferpool_class->alloc_buffer = gst_v4l2_buffer_pool_alloc_buffer;
1429 bufferpool_class->acquire_buffer = gst_v4l2_buffer_pool_acquire_buffer;
1430 bufferpool_class->release_buffer = gst_v4l2_buffer_pool_release_buffer;
1431 bufferpool_class->flush_start = gst_v4l2_buffer_pool_flush_start;
1432 bufferpool_class->flush_stop = gst_v4l2_buffer_pool_flush_stop;
1436 * gst_v4l2_buffer_pool_new:
1437 * @obj: the v4l2 object owning the pool
1439 * Construct a new buffer pool.
1441 * Returns: the new pool, use gst_object_unref() to free resources
1444 gst_v4l2_buffer_pool_new (GstV4l2Object * obj, GstCaps * caps)
1446 GstV4l2BufferPool *pool;
1447 GstStructure *config;
1448 gchar *name, *parent_name;
1451 fd = v4l2_dup (obj->video_fd);
1455 /* setting a significant unique name */
1456 parent_name = gst_object_get_name (GST_OBJECT (obj->element));
1457 name = g_strconcat (parent_name, ":", "pool:",
1458 V4L2_TYPE_IS_OUTPUT (obj->type) ? "sink" : "src", NULL);
1459 g_free (parent_name);
1461 pool = (GstV4l2BufferPool *) g_object_new (GST_TYPE_V4L2_BUFFER_POOL,
1462 "name", name, NULL);
1465 gst_poll_fd_init (&pool->pollfd);
1466 pool->pollfd.fd = fd;
1467 gst_poll_add_fd (pool->poll, &pool->pollfd);
1468 if (V4L2_TYPE_IS_OUTPUT (obj->type))
1469 gst_poll_fd_ctl_write (pool->poll, &pool->pollfd, TRUE);
1471 gst_poll_fd_ctl_read (pool->poll, &pool->pollfd, TRUE);
1473 pool->video_fd = fd;
1475 pool->can_poll_device = TRUE;
1478 gst_v4l2_allocator_new (GST_OBJECT (pool), obj->video_fd, &obj->format);
1479 if (pool->vallocator == NULL)
1480 goto allocator_failed;
1482 gst_object_ref (obj->element);
1484 config = gst_buffer_pool_get_config (GST_BUFFER_POOL_CAST (pool));
1485 gst_buffer_pool_config_set_params (config, caps, obj->info.size, 0, 0);
1486 /* This will simply set a default config, but will not configure the pool
1487 * because min and max are not valid */
1488 gst_buffer_pool_set_config (GST_BUFFER_POOL_CAST (pool), config);
1490 return GST_BUFFER_POOL (pool);
1495 GST_ERROR ("failed to dup fd %d (%s)", errno, g_strerror (errno));
1500 GST_ERROR_OBJECT (pool, "Failed to create V4L2 allocator");
1501 gst_object_unref (pool);
1506 static GstFlowReturn
1507 gst_v4l2_do_read (GstV4l2BufferPool * pool, GstBuffer * buf)
1510 GstV4l2Object *obj = pool->obj;
1515 toread = obj->info.size;
1517 GST_LOG_OBJECT (pool, "reading %d bytes into buffer %p", toread, buf);
1519 gst_buffer_map (buf, &map, GST_MAP_WRITE);
1522 if ((res = gst_v4l2_buffer_pool_poll (pool)) != GST_FLOW_OK)
1525 amount = v4l2_read (obj->video_fd, map.data, toread);
1527 if (amount == toread) {
1529 } else if (amount == -1) {
1530 if (errno == EAGAIN || errno == EINTR) {
1535 /* short reads can happen if a signal interrupts the read */
1540 GST_LOG_OBJECT (pool, "read %d bytes", amount);
1541 gst_buffer_unmap (buf, &map);
1542 gst_buffer_resize (buf, 0, amount);
1549 GST_DEBUG ("poll error %s", gst_flow_get_name (res));
1554 GST_ELEMENT_ERROR (obj->element, RESOURCE, READ,
1555 (_("Error reading %d bytes from device '%s'."),
1556 toread, obj->videodev), GST_ERROR_SYSTEM);
1557 res = GST_FLOW_ERROR;
1562 gst_buffer_unmap (buf, &map);
1563 gst_buffer_resize (buf, 0, 0);
1569 * gst_v4l2_buffer_pool_process:
1570 * @bpool: a #GstBufferPool
1571 * @buf: a #GstBuffer, maybe be replaced
1573 * Process @buf in @bpool. For capture devices, this functions fills @buf with
1574 * data from the device. For output devices, this functions send the contents of
1575 * @buf to the device for playback.
1577 * Returns: %GST_FLOW_OK on success.
1580 gst_v4l2_buffer_pool_process (GstV4l2BufferPool * pool, GstBuffer ** buf)
1582 GstFlowReturn ret = GST_FLOW_OK;
1583 GstBufferPool *bpool = GST_BUFFER_POOL_CAST (pool);
1584 GstV4l2Object *obj = pool->obj;
1586 GST_DEBUG_OBJECT (pool, "process buffer %p", buf);
1588 g_return_val_if_fail (gst_buffer_pool_is_active (bpool), GST_FLOW_ERROR);
1590 if (GST_BUFFER_POOL_IS_FLUSHING (pool))
1591 return GST_FLOW_FLUSHING;
1593 switch (obj->type) {
1594 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1595 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
1597 switch (obj->mode) {
1598 case GST_V4L2_IO_RW:
1599 /* capture into the buffer */
1600 ret = gst_v4l2_do_read (pool, *buf);
1603 case GST_V4L2_IO_MMAP:
1604 case GST_V4L2_IO_DMABUF:
1608 if ((*buf)->pool == bpool) {
1611 if (gst_buffer_get_size (*buf) == 0) {
1612 if (GST_BUFFER_FLAG_IS_SET (*buf, GST_BUFFER_FLAG_CORRUPTED))
1613 goto buffer_corrupted;
1618 num_queued = g_atomic_int_get (&pool->num_queued);
1619 GST_TRACE_OBJECT (pool, "Only %i buffer left in the capture queue.",
1622 /* If we have no more buffer, and can allocate it time to do so */
1623 if (num_queued == 0) {
1624 if (GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, MMAP)) {
1625 ret = gst_v4l2_buffer_pool_resurect_buffer (pool);
1626 if (ret == GST_FLOW_OK)
1631 /* start copying buffers when we are running low on buffers */
1632 if (num_queued < pool->copy_threshold) {
1635 if (GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, MMAP)) {
1636 ret = gst_v4l2_buffer_pool_resurect_buffer (pool);
1637 if (ret == GST_FLOW_OK)
1641 /* copy the buffer */
1642 copy = gst_buffer_copy_region (*buf,
1643 GST_BUFFER_COPY_ALL | GST_BUFFER_COPY_DEEP, 0, -1);
1644 GST_LOG_OBJECT (pool, "copy buffer %p->%p", *buf, copy);
1646 /* and requeue so that we can continue capturing */
1647 gst_buffer_unref (*buf);
1651 /* nothing, data was inside the buffer when we did _acquire() */
1655 /* buffer not from our pool, grab a frame and copy it into the target */
1656 if ((ret = gst_v4l2_buffer_pool_dqbuf (pool, &tmp)) != GST_FLOW_OK)
1659 /* An empty buffer on capture indicates the end of stream */
1660 if (gst_buffer_get_size (tmp) == 0) {
1661 gst_v4l2_buffer_pool_release_buffer (bpool, tmp);
1663 if (GST_BUFFER_FLAG_IS_SET (*buf, GST_BUFFER_FLAG_CORRUPTED))
1664 goto buffer_corrupted;
1669 ret = gst_v4l2_buffer_pool_copy_buffer (pool, *buf, tmp);
1671 /* an queue the buffer again after the copy */
1672 gst_v4l2_buffer_pool_release_buffer (bpool, tmp);
1674 if (ret != GST_FLOW_OK)
1679 case GST_V4L2_IO_USERPTR:
1681 struct UserPtrData *data;
1683 /* Replace our buffer with downstream allocated buffer */
1684 data = gst_mini_object_steal_qdata (GST_MINI_OBJECT (*buf),
1685 GST_V4L2_IMPORT_QUARK);
1686 gst_buffer_replace (buf, data->buffer);
1687 _unmap_userptr_frame (data);
1691 case GST_V4L2_IO_DMABUF_IMPORT:
1695 /* Replace our buffer with downstream allocated buffer */
1696 tmp = gst_mini_object_steal_qdata (GST_MINI_OBJECT (*buf),
1697 GST_V4L2_IMPORT_QUARK);
1698 gst_buffer_replace (buf, tmp);
1699 gst_buffer_unref (tmp);
1704 g_assert_not_reached ();
1709 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1710 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
1712 switch (obj->mode) {
1713 case GST_V4L2_IO_RW:
1714 /* FIXME, do write() */
1715 GST_WARNING_OBJECT (pool, "implement write()");
1718 case GST_V4L2_IO_USERPTR:
1719 case GST_V4L2_IO_DMABUF_IMPORT:
1720 case GST_V4L2_IO_DMABUF:
1721 case GST_V4L2_IO_MMAP:
1723 GstBuffer *to_queue = NULL;
1724 GstV4l2MemoryGroup *group;
1727 if ((*buf)->pool != bpool)
1730 if (!gst_v4l2_is_buffer_valid (*buf, &group))
1733 index = group->buffer.index;
1735 GST_LOG_OBJECT (pool, "processing buffer %i from our pool", index);
1737 index = group->buffer.index;
1738 if (pool->buffers[index] != NULL) {
1739 GST_LOG_OBJECT (pool, "buffer %i already queued, copying", index);
1743 /* we can queue directly */
1744 to_queue = gst_buffer_ref (*buf);
1747 if (to_queue == NULL) {
1748 GstBufferPoolAcquireParams params = { 0 };
1750 GST_LOG_OBJECT (pool, "alloc buffer from our pool");
1752 /* this can return EOS if all buffers are outstanding which would
1753 * be strange because we would expect the upstream element to have
1754 * allocated them and returned to us.. */
1755 params.flags = GST_BUFFER_POOL_ACQUIRE_FLAG_DONTWAIT;
1756 ret = gst_buffer_pool_acquire_buffer (bpool, &to_queue, ¶ms);
1757 if (ret != GST_FLOW_OK)
1758 goto acquire_failed;
1760 ret = gst_v4l2_buffer_pool_prepare_buffer (pool, to_queue, *buf);
1761 if (ret != GST_FLOW_OK) {
1762 gst_buffer_unref (to_queue);
1763 goto prepare_failed;
1767 if ((ret = gst_v4l2_buffer_pool_qbuf (pool, to_queue)) != GST_FLOW_OK)
1770 /* if we are not streaming yet (this is the first buffer, start
1772 if (!gst_v4l2_buffer_pool_streamon (pool)) {
1773 /* don't check return value because qbuf would have failed */
1774 gst_v4l2_is_buffer_valid (to_queue, &group);
1776 /* qbuf has taken the ref of the to_queue buffer but we are no in
1777 * streaming state, so the flush logic won't be performed.
1778 * To avoid leaks, flush the allocator and restore the queued
1779 * buffer as non-queued */
1780 gst_v4l2_allocator_flush (pool->vallocator);
1782 pool->buffers[group->buffer.index] = NULL;
1784 gst_mini_object_set_qdata (GST_MINI_OBJECT (to_queue),
1785 GST_V4L2_IMPORT_QUARK, NULL, NULL);
1786 gst_buffer_unref (to_queue);
1787 g_atomic_int_add (&pool->num_queued, -1);
1791 if (g_atomic_int_get (&pool->num_queued) >= pool->min_latency) {
1793 /* all buffers are queued, try to dequeue one and release it back
1794 * into the pool so that _acquire can get to it again. */
1795 ret = gst_v4l2_buffer_pool_dqbuf (pool, &out);
1796 if (ret == GST_FLOW_OK)
1797 /* release the rendered buffer back into the pool. This wakes up any
1798 * thread waiting for a buffer in _acquire(). */
1799 gst_buffer_unref (out);
1804 g_assert_not_reached ();
1809 g_assert_not_reached ();
1818 GST_ERROR_OBJECT (pool, "failed to copy buffer");
1823 GST_WARNING_OBJECT (pool, "Dropping corrupted buffer without payload");
1824 gst_buffer_unref (*buf);
1826 return GST_V4L2_FLOW_CORRUPTED_BUFFER;
1830 GST_DEBUG_OBJECT (pool, "end of stream reached");
1831 gst_buffer_unref (*buf);
1833 return GST_V4L2_FLOW_LAST_BUFFER;
1837 if (ret == GST_FLOW_FLUSHING)
1838 GST_DEBUG_OBJECT (pool, "flushing");
1840 GST_WARNING_OBJECT (pool, "failed to acquire a buffer: %s",
1841 gst_flow_get_name (ret));
1846 GST_ERROR_OBJECT (pool, "failed to prepare data");
1851 GST_ERROR_OBJECT (pool, "failed to queue buffer");
1856 GST_ERROR_OBJECT (pool, "failed to start streaming");
1857 return GST_FLOW_ERROR;
1862 gst_v4l2_buffer_pool_set_other_pool (GstV4l2BufferPool * pool,
1863 GstBufferPool * other_pool)
1865 g_return_if_fail (!gst_buffer_pool_is_active (GST_BUFFER_POOL (pool)));
1867 if (pool->other_pool)
1868 gst_object_unref (pool->other_pool);
1869 pool->other_pool = gst_object_ref (other_pool);