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gstreamer/sys/v4l2/gstv4l2bufferpool.c
Nicolas Dufresne cf6c7e9846 v4l2bufferpool: Do not pre-configure the pool 
Pre-configuring the pool is error prone, since it may hide a configuration failure and
endup with a pool that is not configured the way it should (e.g. no video meta, wrong
queue size, etc.)
2014-05-08 15:56:36 -04:00

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/* GStreamer
*
* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
* 2006 Edgard Lima <edgard.lima@indt.org.br>
* 2009 Texas Instruments, Inc - http://www.ti.com/
*
* gstv4l2bufferpool.c V4L2 buffer pool class
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifndef _GNU_SOURCE
# define _GNU_SOURCE /* O_CLOEXEC */
#endif
#include <fcntl.h>
#include <sys/mman.h>
#include <string.h>
#include <unistd.h>
#include "gst/video/video.h"
#include "gst/video/gstvideometa.h"
#include "gst/video/gstvideopool.h"
#include "gst/allocators/gstdmabuf.h"
#include <gstv4l2bufferpool.h>
#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
/*
* GstV4l2BufferPool:
*/
#define gst_v4l2_buffer_pool_parent_class parent_class
G_DEFINE_TYPE (GstV4l2BufferPool, gst_v4l2_buffer_pool, GST_TYPE_BUFFER_POOL);
enum _GstV4l2BufferPoolAcquireFlags
{
GST_V4L2_POOL_ACQUIRE_FLAG_RESURECT = GST_BUFFER_POOL_ACQUIRE_FLAG_LAST,
GST_V4L2_BUFFER_POOL_ACQUIRE_FAG_LAST
};
static void gst_v4l2_buffer_pool_release_buffer (GstBufferPool * bpool,
GstBuffer * buffer);
static gboolean
gst_v4l2_is_buffer_valid (GstBuffer * buffer, GstV4l2MemoryGroup ** group)
{
GstMemory *mem = gst_buffer_peek_memory (buffer, 0);
gboolean valid = FALSE;
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY))
goto done;
if (gst_is_v4l2_memory (mem)) {
GstV4l2Memory *vmem = (GstV4l2Memory *) mem;
valid = TRUE;
if (group)
*group = vmem->group;
}
done:
return valid;
}
static GstFlowReturn
gst_v4l2_buffer_pool_alloc_buffer (GstBufferPool * bpool, GstBuffer ** buffer,
GstBufferPoolAcquireParams * params)
{
GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
GstV4l2MemoryGroup *group = NULL;
GstBuffer *newbuf = NULL;
GstV4l2Object *obj;
GstVideoInfo *info;
GstVideoAlignment *align;
obj = pool->obj;
info = &obj->info;
align = &obj->align;
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:
group = gst_v4l2_allocator_alloc_mmap (pool->vallocator);
break;
case GST_V4L2_IO_DMABUF:
/* TODO group = gst_v4l2_allocator_alloc_dmabuf (pool->vallocator); */
break;
case GST_V4L2_IO_USERPTR:
default:
newbuf = NULL;
g_assert_not_reached ();
break;
}
if (group != NULL) {
gint i;
newbuf = gst_buffer_new ();
for (i = 0; i < group->n_mem; i++)
gst_buffer_append_memory (newbuf, group->mem[i]);
} else if (newbuf == NULL) {
goto allocation_failed;
}
/* add metadata to raw video buffers */
if (pool->add_videometa && info->finfo) {
const GstVideoFormatInfo *finfo = info->finfo;
gsize offset[GST_VIDEO_MAX_PLANES];
gint width, height, n_gst_planes, offs, i, stride[GST_VIDEO_MAX_PLANES];
width = GST_VIDEO_INFO_WIDTH (info);
height = GST_VIDEO_INFO_HEIGHT (info);
/* n_gst_planes is the number of planes
* (RGB: 1, YUY2: 1, NV12: 2, I420: 3)
* It's greater or equal than the number of v4l2 planes. */
n_gst_planes = GST_VIDEO_INFO_N_PLANES (info);
/* the basic are common between MPLANE mode and non MPLANE mode
* except a special case inside the loop at the end
*/
offs = 0;
for (i = 0; i < n_gst_planes; i++) {
GST_DEBUG_OBJECT (pool, "adding video meta, bytesperline %d",
obj->bytesperline[i]);
offset[i] = offs;
if (GST_VIDEO_FORMAT_INFO_IS_TILED (finfo)) {
guint x_tiles, y_tiles, ws, hs, tile_height;
ws = GST_VIDEO_FORMAT_INFO_TILE_WS (finfo);
hs = GST_VIDEO_FORMAT_INFO_TILE_HS (finfo);
tile_height = 1 << hs;
x_tiles = obj->bytesperline[i] >> ws;
y_tiles = GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (finfo, i,
GST_ROUND_UP_N (height, tile_height) >> hs);
stride[i] = GST_VIDEO_TILE_MAKE_STRIDE (x_tiles, y_tiles);
} else {
stride[i] = obj->bytesperline[i];
}
/* when using multiplanar mode and if there is more then one v4l
* plane for each gst plane
*/
if (V4L2_TYPE_IS_MULTIPLANAR (obj->type) && group->n_mem > 1)
/* non_contiguous case here so we have to make sure that gst goes to the
* next plane (using default gstvideometa.c::default_map).
* And the next plane is after length bytes of the previous one from
* the gst buffer point of view. */
offs += gst_memory_get_sizes (group->mem[i], NULL, NULL);
else
offs += obj->bytesperline[i] *
GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (finfo, i, height);
}
gst_buffer_add_video_meta_full (newbuf, GST_VIDEO_FRAME_FLAG_NONE,
GST_VIDEO_INFO_FORMAT (info), width, height, n_gst_planes,
offset, stride);
}
if (pool->add_cropmeta) {
GstVideoCropMeta *crop;
crop = gst_buffer_add_video_crop_meta (newbuf);
crop->x = align->padding_left;
crop->y = align->padding_top;
crop->width = info->width;
crop->width = info->height;
}
pool->num_allocated++;
*buffer = newbuf;
return GST_FLOW_OK;
/* ERRORS */
allocation_failed:
{
GST_WARNING ("Failed to allocated buffer");
return GST_FLOW_EOS;
}
}
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;
GstAllocator *allocator;
GstAllocationParams params;
gboolean can_allocate = FALSE;
gboolean updated = FALSE;
gboolean ret;
pool->add_videometa =
gst_buffer_pool_config_has_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_META);
pool->add_cropmeta =
gst_buffer_pool_config_has_option (config,
GST_V4L2_BUFFER_POOL_OPTION_CROP_META);
if (!pool->add_videometa && obj->need_video_meta)
goto missing_video_api;
if (!pool->add_cropmeta && obj->need_crop_meta)
goto missing_crop_api;
/* parse the config and keep around */
if (!gst_buffer_pool_config_get_params (config, &caps, &size, &min_buffers,
&max_buffers))
goto wrong_config;
if (!gst_buffer_pool_config_get_allocator (config, &allocator, &params))
goto wrong_config;
GST_DEBUG_OBJECT (pool, "config %" GST_PTR_FORMAT, config);
if (pool->allocator)
gst_object_unref (pool->allocator);
pool->allocator = NULL;
switch (obj->mode) {
case GST_V4L2_IO_DMABUF:
pool->allocator = gst_dmabuf_allocator_new ();
can_allocate = GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, MMAP);
break;
case GST_V4L2_IO_MMAP:
can_allocate = GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, MMAP);
break;
case GST_V4L2_IO_USERPTR:
can_allocate =
GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, USERPTR);
break;
case GST_V4L2_IO_RW:
default:
pool->allocator = g_object_ref (allocator);
pool->params = params;
/* No need to change the configuration */
goto done;
break;
}
if (min_buffers < GST_V4L2_MIN_BUFFERS) {
updated = TRUE;
min_buffers = GST_V4L2_MIN_BUFFERS;
GST_INFO_OBJECT (pool, "increasing minimum buffers to %u", min_buffers);
}
if (max_buffers > VIDEO_MAX_FRAME || max_buffers == 0) {
updated = TRUE;
max_buffers = VIDEO_MAX_FRAME;
GST_INFO_OBJECT (pool, "reducing maximum buffers to %u", max_buffers);
}
if (min_buffers > max_buffers) {
updated = TRUE;
min_buffers = max_buffers;
GST_INFO_OBJECT (pool, "reducing minimum buffers to %u", min_buffers);
} else if (min_buffers != max_buffers) {
if (!can_allocate) {
updated = TRUE;
max_buffers = min_buffers;
GST_INFO_OBJECT (pool, "can't allocate, setting maximum to minimum");
}
}
if (updated)
gst_buffer_pool_config_set_params (config, caps, size, min_buffers,
max_buffers);
done:
ret = GST_BUFFER_POOL_CLASS (parent_class)->set_config (bpool, config);
/* If anything was changed documentation recommand to return FALSE */
return !updated && ret;
/* ERRORS */
missing_video_api:
{
GST_ERROR_OBJECT (pool, "missing GstVideoMeta API in config");
return FALSE;
}
missing_crop_api:
{
GST_ERROR_OBJECT (pool, "missing GstVideoCropMeta API");
return FALSE;
}
wrong_config:
{
GST_ERROR_OBJECT (pool, "invalid config %" GST_PTR_FORMAT, config);
return FALSE;
}
}
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:
case GST_V4L2_IO_DMABUF:
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;
return TRUE;
/* ERRORS */
start_failed:
{
GST_ERROR_OBJECT (pool, "error with STREAMON %d (%s)", errno,
g_strerror (errno));
return FALSE;
}
}
static void
gst_v4l2_buffer_pool_group_released (GstV4l2BufferPool * pool)
{
GstBufferPoolAcquireParams params = { 0 };
GstBuffer *buffer = NULL;
GstFlowReturn ret;
GST_DEBUG_OBJECT (pool, "A buffer was lost, reallocating it");
params.flags = GST_V4L2_POOL_ACQUIRE_FLAG_RESURECT;
ret = gst_buffer_pool_acquire_buffer (GST_BUFFER_POOL (pool), &buffer,
&params);
if (ret == GST_FLOW_OK)
gst_buffer_unref (buffer);
}
static gboolean
gst_v4l2_buffer_pool_start (GstBufferPool * bpool)
{
GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
GstV4l2Object *obj = pool->obj;
GstStructure *config;
GstCaps *caps;
guint size, min_buffers, max_buffers;
guint num_buffers = 0, copy_threshold = 0;
config = gst_buffer_pool_get_config (bpool);
if (!gst_buffer_pool_config_get_params (config, &caps, &size, &min_buffers,
&max_buffers))
goto wrong_config;
switch (obj->mode) {
case GST_V4L2_IO_RW:
/* this value also instructs the latency calculation to have min_buffers
* frame latency max */
num_buffers = min_buffers;
break;
case GST_V4L2_IO_DMABUF:
case GST_V4L2_IO_MMAP:
{
guint count;
if (GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, MMAP)) {
num_buffers = min_buffers;
} else {
num_buffers = max_buffers;
}
/* first, lets request buffers, and see how many we can get: */
GST_DEBUG_OBJECT (pool, "requesting %d MMAP buffers", num_buffers);
count = gst_v4l2_allocator_start (pool->vallocator, num_buffers,
V4L2_MEMORY_MMAP);
if (count < GST_V4L2_MIN_BUFFERS) {
num_buffers = count;
goto no_buffers;
}
/* V4L2 buffer pool are often very limited in the amount of buffers it
* can offer. The copy_threshold will workaround this limitation by
* falling back to copy if the pipeline needed more buffers. This also
* prevent having to do REQBUFS(N)/REQBUFS(0) everytime configure is
* called. */
if (count != num_buffers) {
GST_WARNING_OBJECT (pool, "using %u buffers instead of %u",
count, num_buffers);
num_buffers = count;
copy_threshold =
MAX (GST_V4L2_MIN_BUFFERS, obj->min_buffers_for_capture);
/* Ensure GstBufferPool don't expect initial minimum */
if (min_buffers > count)
min_buffers = count;
}
break;
}
case GST_V4L2_IO_USERPTR:
default:
num_buffers = 0;
copy_threshold = 0;
g_assert_not_reached ();
break;
}
pool->size = size;
pool->copy_threshold = copy_threshold;
pool->num_buffers = num_buffers;
pool->num_allocated = 0;
pool->num_queued = 0;
gst_buffer_pool_config_set_params (config, caps, size, min_buffers,
max_buffers);
GST_BUFFER_POOL_CLASS (parent_class)->set_config (bpool, config);
gst_structure_free (config);
/* now, allocate the buffers: */
if (!GST_BUFFER_POOL_CLASS (parent_class)->start (bpool))
goto start_failed;
/* we can start capturing now, we wait for the playback case until we queued
* the first buffer */
if (!V4L2_TYPE_IS_OUTPUT (obj->type))
if (!start_streaming (pool))
goto start_failed;
if (!V4L2_TYPE_IS_OUTPUT (obj->type))
pool->group_released_handler =
g_signal_connect_swapped (pool->vallocator, "group-released",
G_CALLBACK (gst_v4l2_buffer_pool_group_released), pool);
gst_poll_set_flushing (obj->poll, FALSE);
return TRUE;
/* ERRORS */
wrong_config:
{
GST_ERROR_OBJECT (pool, "invalid config %" GST_PTR_FORMAT, config);
return FALSE;
}
no_buffers:
{
GST_ERROR_OBJECT (pool,
"we received %d buffer from device '%s', we want at least %d",
num_buffers, obj->videodev, GST_V4L2_MIN_BUFFERS);
return FALSE;
}
start_failed:
{
GST_ERROR_OBJECT (pool, "failed to start streaming");
return FALSE;
}
}
static gboolean
stop_streaming (GstV4l2BufferPool * pool)
{
GstV4l2Object *obj = pool->obj;
gint i;
GST_DEBUG_OBJECT (pool, "stopping stream");
gst_poll_set_flushing (obj->poll, TRUE);
if (!pool->streaming) {
/* it avoid error: STREAMOFF 22 (Invalid argument) when
* attempting to stop a stream not previously started */
GST_DEBUG_OBJECT (pool, "no need to stop, was not previously started");
return TRUE;
}
switch (obj->mode) {
case GST_V4L2_IO_RW:
break;
case GST_V4L2_IO_MMAP:
case GST_V4L2_IO_USERPTR:
case GST_V4L2_IO_DMABUF:
GST_DEBUG_OBJECT (pool, "STREAMOFF");
if (v4l2_ioctl (pool->video_fd, VIDIOC_STREAMOFF, &obj->type) < 0)
goto stop_failed;
gst_v4l2_allocator_flush (pool->vallocator);
for (i = 0; i < pool->num_allocated; i++) {
if (pool->buffers[i]) {
GstBufferPool *bpool = (GstBufferPool *) pool;
GstBuffer *buffer = pool->buffers[i];
pool->buffers[i] = NULL;
pool->num_queued--;
if (V4L2_TYPE_IS_OUTPUT (obj->type))
gst_buffer_unref (buffer);
else
/* Give back the outstanding buffer to the pool */
GST_BUFFER_POOL_CLASS (parent_class)->release_buffer (bpool,
buffer);
}
}
g_return_val_if_fail (pool->num_queued == 0, FALSE);
break;
default:
g_return_val_if_reached (FALSE);
break;
}
pool->streaming = FALSE;
return TRUE;
/* ERRORS */
stop_failed:
{
GST_ERROR_OBJECT (pool, "error with STREAMOFF %d (%s)", errno,
g_strerror (errno));
return FALSE;
}
}
static gboolean
gst_v4l2_buffer_pool_stop (GstBufferPool * bpool)
{
gboolean ret;
GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
GstV4l2Object *obj = pool->obj;
GST_DEBUG_OBJECT (pool, "stopping pool");
if (pool->group_released_handler > 0) {
g_signal_handler_disconnect (pool->vallocator,
pool->group_released_handler);
pool->group_released_handler = 0;
}
gst_poll_set_flushing (obj->poll, TRUE);
if (!stop_streaming (pool))
goto stop_failed;
ret = GST_BUFFER_POOL_CLASS (parent_class)->stop (bpool);
if (ret) {
GstV4l2Return vret;
vret = gst_v4l2_allocator_stop (pool->vallocator);
if (vret == GST_V4L2_BUSY) {
GST_WARNING_OBJECT (pool, "allocated buffer need to be reclaimed");
/* FIXME deal with reclaiming */
} else if (vret == GST_V4L2_ERROR) {
ret = FALSE;
}
}
return ret;
/* ERRORS */
stop_failed:
{
GST_ERROR_OBJECT (pool, "error with STREAMOFF %d (%s)", errno,
g_strerror (errno));
return FALSE;
}
}
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;
}
}
}
return GST_FLOW_OK;
/* ERRORS */
stopped:
{
GST_DEBUG ("stop called");
return GST_FLOW_FLUSHING;
}
select_error:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, READ, (NULL),
("poll error %d: %s (%d)", ret, g_strerror (errno), errno));
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
gst_v4l2_buffer_pool_qbuf (GstV4l2BufferPool * pool, GstBuffer * buf)
{
GstV4l2MemoryGroup *group = NULL;
gint index;
if (!gst_v4l2_is_buffer_valid (buf, &group)) {
GST_LOG_OBJECT (pool, "unref copied/invalid buffer %p", buf);
gst_buffer_unref (buf);
return GST_FLOW_OK;
}
index = group->buffer.index;
if (pool->buffers[index] != NULL)
goto already_queued;
GST_LOG_OBJECT (pool, "queuing buffer %i", index);
if (!gst_v4l2_allocator_qbuf (pool->vallocator, group))
goto queue_failed;
pool->buffers[index] = buf;
pool->num_queued++;
return GST_FLOW_OK;
already_queued:
{
GST_ERROR_OBJECT (pool, "the buffer %i was already queued", index);
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
queue_failed:
{
GST_ERROR_OBJECT (pool, "could not queue a buffer %i", index);
/* Return broken buffer to the allocator */
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_TAG_MEMORY);
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
gst_v4l2_buffer_pool_dqbuf (GstV4l2BufferPool * pool, GstBuffer ** buffer)
{
GstFlowReturn res;
GstBuffer *outbuf;
GstV4l2Object *obj = pool->obj;
GstClockTime timestamp;
GstV4l2MemoryGroup *group;
gint i;
if ((res = gst_v4l2_object_poll (obj)) != GST_FLOW_OK)
goto poll_failed;
GST_LOG_OBJECT (pool, "dequeueing a buffer");
group = gst_v4l2_allocator_dqbuf (pool->vallocator);
if (group == NULL)
goto dqbuf_failed;
/* get our GstBuffer with that index from the pool, if the buffer was
* outstanding we have a serious problem.
*/
outbuf = pool->buffers[group->buffer.index];
if (outbuf == NULL)
goto no_buffer;
/* mark the buffer outstanding */
pool->buffers[group->buffer.index] = NULL;
pool->num_queued--;
timestamp = GST_TIMEVAL_TO_TIME (group->buffer.timestamp);
#ifndef GST_DISABLE_GST_DEBUG
for (i = 0; i < group->n_mem; i++) {
GST_LOG_OBJECT (pool,
"dequeued buffer %p seq:%d (ix=%d), mem %p used %d, plane=%d, flags %08x, ts %"
GST_TIME_FORMAT ", pool-queued=%d, buffer=%p", outbuf,
group->buffer.sequence, group->buffer.index, group->mem[i],
group->planes[i].bytesused, i, group->buffer.flags,
GST_TIME_ARGS (timestamp), pool->num_queued, outbuf);
}
#endif
/* set top/bottom field first if v4l2_buffer has the information */
if (group->buffer.field == V4L2_FIELD_INTERLACED_TB) {
GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_INTERLACED);
GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_TFF);
} else if (group->buffer.field == V4L2_FIELD_INTERLACED_BT) {
GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_INTERLACED);
GST_BUFFER_FLAG_UNSET (outbuf, GST_VIDEO_BUFFER_FLAG_TFF);
} else {
GST_BUFFER_FLAG_UNSET (outbuf, GST_VIDEO_BUFFER_FLAG_INTERLACED);
GST_BUFFER_FLAG_UNSET (outbuf, GST_VIDEO_BUFFER_FLAG_TFF);
}
if (GST_VIDEO_INFO_FORMAT (&obj->info) == GST_VIDEO_FORMAT_ENCODED) {
if (group->buffer.flags & V4L2_BUF_FLAG_KEYFRAME)
GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
}
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
*buffer = outbuf;
return GST_FLOW_OK;
/* ERRORS */
poll_failed:
{
GST_DEBUG_OBJECT (pool, "poll error %s", gst_flow_get_name (res));
return res;
}
dqbuf_failed:
{
return GST_FLOW_ERROR;
}
no_buffer:
{
GST_ERROR_OBJECT (pool, "No free buffer found in the pool at index %d.",
group->buffer.index);
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
gst_v4l2_buffer_pool_acquire_buffer (GstBufferPool * bpool, GstBuffer ** buffer,
GstBufferPoolAcquireParams * params)
{
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:
case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
/* 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_DMABUF:
case GST_V4L2_IO_MMAP:
/* If this is being called to resurect a lost buffer */
if (params && params->flags & GST_V4L2_POOL_ACQUIRE_FLAG_RESURECT) {
ret = GST_BUFFER_POOL_CLASS (parent_class)->acquire_buffer (bpool,
buffer, params);
break;
}
/* 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;
if (GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, MMAP)) {
if (GST_BUFFER_POOL_CLASS (parent_class)->acquire_buffer (bpool,
&copy, params) == GST_FLOW_OK) {
gst_v4l2_buffer_pool_release_buffer (bpool, copy);
break;
}
}
/* copy the buffer */
copy = gst_buffer_copy_region (*buffer,
GST_BUFFER_COPY_ALL | GST_BUFFER_COPY_DEEP, 0, -1);
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:
ret = GST_FLOW_ERROR;
g_assert_not_reached ();
break;
}
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
/* 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:
ret = GST_FLOW_ERROR;
g_assert_not_reached ();
break;
}
break;
default:
ret = GST_FLOW_ERROR;
g_assert_not_reached ();
break;
}
done:
return ret;
/* ERRORS */
flushing:
{
GST_DEBUG_OBJECT (pool, "We are flushing");
return GST_FLOW_FLUSHING;
}
}
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:
case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
/* 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_DMABUF:
case GST_V4L2_IO_MMAP:
{
if (gst_v4l2_is_buffer_valid (buffer, NULL)) {
/* queue back in the device */
gst_v4l2_buffer_pool_qbuf (pool, buffer);
} else {
/* Simply release invalide/modified buffer, the allocator will
* give it back later */
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
GST_BUFFER_POOL_CLASS (parent_class)->release_buffer (bpool,
buffer);
}
break;
}
case GST_V4L2_IO_USERPTR:
default:
g_assert_not_reached ();
break;
}
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
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:
{
GstV4l2MemoryGroup *group;
guint index;
if (!gst_v4l2_is_buffer_valid (buffer, &group)) {
/* Simply release invalide/modified buffer, the allocator will
* give it back later */
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_TAG_MEMORY);
GST_BUFFER_POOL_CLASS (parent_class)->release_buffer (bpool,
buffer);
break;
}
index = group->buffer.index;
if (pool->buffers[index] == NULL) {
GST_LOG_OBJECT (pool, "buffer %u not queued, putting on free list",
index);
/* reset to default size */
gst_v4l2_allocator_reset_size (pool->vallocator, group);
/* 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 %u is queued", index);
}
break;
}
case GST_V4L2_IO_USERPTR:
default:
g_assert_not_reached ();
break;
}
break;
default:
g_assert_not_reached ();
break;
}
}
static void
gst_v4l2_buffer_pool_finalize (GObject * object)
{
GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (object);
gint i;
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
if (pool->buffers[i])
gst_buffer_replace (&(pool->buffers[i]), NULL);
}
if (pool->video_fd >= 0)
v4l2_close (pool->video_fd);
if (pool->vallocator)
gst_object_unref (pool->vallocator);
if (pool->allocator)
gst_object_unref (pool->allocator);
/* FIXME Is this required to keep around ? */
gst_object_unref (pool->obj->element);
/* FIXME have we done enough here ? */
G_OBJECT_CLASS (parent_class)->finalize (object);
}
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;
}
/**
* gst_v4l2_buffer_pool_new:
* @obj: the v4l2 object owning the pool
*
* Construct a new buffer pool.
*
* Returns: the new pool, use gst_object_unref() to free resources
*/
GstBufferPool *
gst_v4l2_buffer_pool_new (GstV4l2Object * obj, GstCaps * caps)
{
GstV4l2BufferPool *pool;
GstStructure *config;
gchar *name, *parent_name;
gint fd;
fd = v4l2_dup (obj->video_fd);
if (fd < 0)
goto dup_failed;
/* setting a significant unique name */
parent_name = gst_object_get_name (GST_OBJECT (obj->element));
name = g_strconcat (parent_name, ":", "pool:",
V4L2_TYPE_IS_OUTPUT (obj->type) ? "sink" : "src", NULL);
g_free (parent_name);
pool = (GstV4l2BufferPool *) g_object_new (GST_TYPE_V4L2_BUFFER_POOL,
"name", name, NULL);
g_free (name);
pool->video_fd = fd;
pool->obj = obj;
pool->vallocator =
gst_v4l2_allocator_new (GST_OBJECT (pool), obj->video_fd, &obj->format);
gst_object_ref (obj->element);
config = gst_buffer_pool_get_config (GST_BUFFER_POOL_CAST (pool));
gst_buffer_pool_config_set_params (config, caps, obj->sizeimage, 0, 0);
/* This will simply set a default config, but will not configure the pool
* because min and max are not valid */
gst_buffer_pool_set_config (GST_BUFFER_POOL_CAST (pool), config);
return GST_BUFFER_POOL (pool);
/* ERRORS */
dup_failed:
{
GST_ERROR ("failed to dup fd %d (%s)", errno, g_strerror (errno));
return NULL;
}
}
static GstFlowReturn
gst_v4l2_do_read (GstV4l2BufferPool * pool, GstBuffer * buf)
{
GstFlowReturn res;
GstV4l2Object *obj = pool->obj;
gint amount;
GstMapInfo map;
gint toread;
toread = obj->sizeimage;
GST_LOG_OBJECT (pool, "reading %d bytes into buffer %p", toread, buf);
gst_buffer_map (buf, &map, GST_MAP_WRITE);
do {
if ((res = gst_v4l2_object_poll (obj)) != GST_FLOW_OK)
goto poll_error;
amount = v4l2_read (obj->video_fd, map.data, toread);
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);
return GST_FLOW_OK;
/* 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;
}
}
/**
* gst_v4l2_buffer_pool_process:
* @bpool: a #GstBufferPool
* @buf: a #GstBuffer
*
* 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: %GST_FLOW_OK on success.
*/
GstFlowReturn
gst_v4l2_buffer_pool_process (GstV4l2BufferPool * pool, GstBuffer * buf)
{
GstFlowReturn ret = GST_FLOW_OK;
GstBufferPool *bpool = GST_BUFFER_POOL_CAST (pool);
GstV4l2Object *obj = pool->obj;
GST_DEBUG_OBJECT (pool, "process buffer %p", buf);
g_return_val_if_fail (gst_buffer_pool_is_active (bpool), GST_FLOW_ERROR);
switch (obj->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
/* 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) {
if (gst_buffer_get_size (buf) == 0)
goto eos;
else
/* 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;
/* An empty buffer on capture indicates the end of stream */
if (gst_buffer_get_size (tmp) == 0) {
gst_buffer_unref (tmp);
goto eos;
}
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:
case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
/* playback */
switch (obj->mode) {
case GST_V4L2_IO_RW:
/* FIXME, do write() */
GST_WARNING_OBJECT (pool, "implement write()");
break;
case GST_V4L2_IO_DMABUF:
case GST_V4L2_IO_MMAP:
{
GstBuffer *to_queue;
if (buf->pool == bpool) {
/* nothing, we can queue directly */
to_queue = gst_buffer_ref (buf);
GST_LOG_OBJECT (pool, "processing buffer from our pool");
} else {
GstBufferPoolAcquireParams params = { 0 };
GST_LOG_OBJECT (pool, "alloc buffer from our pool");
/* this can return EOS if all buffers are outstanding which would
* be strange because we would expect the upstream element to have
* allocated them and returned to us.. */
params.flags = GST_BUFFER_POOL_ACQUIRE_FLAG_DONTWAIT;
ret = gst_buffer_pool_acquire_buffer (bpool, &to_queue, &params);
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) {
GstBuffer *out;
/* 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, &out);
if (ret != GST_FLOW_OK) {
gst_buffer_unref (to_queue);
goto done;
}
/* release the rendered buffer back into the pool. This wakes up any
* thread waiting for a buffer in _acquire(). If the buffer still has
* a pool then this will happen when the refcount reaches 0 */
if (!out->pool)
gst_v4l2_buffer_pool_release_buffer (bpool, out);
}
gst_buffer_unref (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 */
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;
}
eos:
{
GST_DEBUG_OBJECT (obj->element, "end of stream reached");
return GST_FLOW_EOS;
}
}
/**
* gst_v4l2_buffer_pool_flush:
* @bpool: a #GstBufferPool
*
* First, set obj->poll to be flushing
* Call STREAMOFF to clear QUEUED flag on every driver buffers.
* Then release all buffers that are in pool->buffers array.
* Finally call STREAMON if CAPTURE type
* The caller is responsible to unset flushing on obj->pool
*
* Returns: TRUE on success.
*/
gboolean
gst_v4l2_buffer_pool_flush (GstV4l2BufferPool * pool)
{
GstV4l2Object *obj = pool->obj;
GST_DEBUG_OBJECT (pool, "flush");
stop_streaming (pool);
/* we can start capturing now, we wait for the playback
* case until we queued the first buffer */
if (!V4L2_TYPE_IS_OUTPUT (obj->type))
if (!start_streaming (pool))
goto start_failed;
return TRUE;
/* ERRORS */
start_failed:
{
GST_ERROR_OBJECT (pool, "failed to start streaming");
return FALSE;
}
}
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