gstreamer/subprojects/gst-plugins-bad/sys/v4l2codecs/gstv4l2decoder.c

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/* GStreamer
* Copyright (C) 2020 Nicolas Dufresne <nicolas.dufresne@collabora.com>
*
* 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
#include "gstv4l2codecallocator.h"
#include "gstv4l2codecpool.h"
#include "gstv4l2decoder.h"
#include "gstv4l2format.h"
#include "linux/media.h"
#include "linux/videodev2.h"
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <gst/base/base.h>
#define IMAGE_MINSZ (256*1024) /* 256kB */
GST_DEBUG_CATEGORY (v4l2_decoder_debug);
#define GST_CAT_DEFAULT v4l2_decoder_debug
enum
{
PROP_0,
PROP_MEDIA_DEVICE,
PROP_VIDEO_DEVICE,
};
struct _GstV4l2Request
{
/* non-thread safe */
gint ref_count;
GstV4l2Decoder *decoder;
gint fd;
guint32 frame_num;
GstMemory *bitstream;
GstBuffer *pic_buf;
GstPoll *poll;
GstPollFD pollfd;
/* request state */
gboolean pending;
gboolean failed;
gboolean hold_pic_buf;
gboolean sub_request;
};
struct _GstV4l2Decoder
{
GstObject parent;
gboolean opened;
gint media_fd;
gint video_fd;
GstQueueArray *request_pool;
GstQueueArray *pending_requests;
guint version;
enum v4l2_buf_type src_buf_type;
enum v4l2_buf_type sink_buf_type;
gboolean mplane;
/* properties */
gchar *media_device;
gchar *video_device;
guint render_delay;
/* detected features */
gboolean supports_holding_capture;
};
G_DEFINE_TYPE_WITH_CODE (GstV4l2Decoder, gst_v4l2_decoder, GST_TYPE_OBJECT,
GST_DEBUG_CATEGORY_INIT (v4l2_decoder_debug, "v4l2codecs-decoder", 0,
"V4L2 stateless decoder helper"));
static void gst_v4l2_request_free (GstV4l2Request * request);
static guint32
direction_to_buffer_type (GstV4l2Decoder * self, GstPadDirection direction)
{
if (direction == GST_PAD_SRC)
return self->src_buf_type;
else
return self->sink_buf_type;
}
static void
gst_v4l2_decoder_finalize (GObject * obj)
{
GstV4l2Decoder *self = GST_V4L2_DECODER (obj);
gst_v4l2_decoder_close (self);
g_free (self->media_device);
g_free (self->video_device);
gst_queue_array_free (self->request_pool);
gst_queue_array_free (self->pending_requests);
G_OBJECT_CLASS (gst_v4l2_decoder_parent_class)->finalize (obj);
}
static void
gst_v4l2_decoder_init (GstV4l2Decoder * self)
{
self->request_pool = gst_queue_array_new (16);
self->pending_requests = gst_queue_array_new (16);
}
static void
gst_v4l2_decoder_class_init (GstV4l2DecoderClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = gst_v4l2_decoder_finalize;
gobject_class->get_property = gst_v4l2_decoder_get_property;
gobject_class->set_property = gst_v4l2_decoder_set_property;
gst_v4l2_decoder_install_properties (gobject_class, 0, NULL);
}
GstV4l2Decoder *
gst_v4l2_decoder_new (GstV4l2CodecDevice * device)
{
GstV4l2Decoder *decoder;
g_return_val_if_fail (device->function == MEDIA_ENT_F_PROC_VIDEO_DECODER,
NULL);
decoder = g_object_new (GST_TYPE_V4L2_DECODER,
"media-device", device->media_device_path,
"video-device", device->video_device_path, NULL);
return gst_object_ref_sink (decoder);
}
guint
gst_v4l2_decoder_get_version (GstV4l2Decoder * self)
{
return self->version;
}
gboolean
gst_v4l2_decoder_open (GstV4l2Decoder * self)
{
gint ret;
struct v4l2_capability querycap;
guint32 capabilities;
self->media_fd = open (self->media_device, 0);
if (self->media_fd < 0) {
GST_ERROR_OBJECT (self, "Failed to open '%s': %s",
self->media_device, g_strerror (errno));
return FALSE;
}
self->video_fd = open (self->video_device, O_NONBLOCK);
if (self->video_fd < 0) {
GST_ERROR_OBJECT (self, "Failed to open '%s': %s",
self->video_device, g_strerror (errno));
return FALSE;
}
ret = ioctl (self->video_fd, VIDIOC_QUERYCAP, &querycap);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_QUERYCAP failed: %s", g_strerror (errno));
gst_v4l2_decoder_close (self);
return FALSE;
}
self->version = querycap.version;
if (querycap.capabilities & V4L2_CAP_DEVICE_CAPS)
capabilities = querycap.device_caps;
else
capabilities = querycap.capabilities;
if (capabilities & V4L2_CAP_VIDEO_M2M_MPLANE) {
self->sink_buf_type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
self->src_buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
self->mplane = TRUE;
} else if (capabilities & V4L2_CAP_VIDEO_M2M) {
self->sink_buf_type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
self->src_buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
self->mplane = FALSE;
} else {
GST_ERROR_OBJECT (self, "Unsupported memory-2-memory device.");
gst_v4l2_decoder_close (self);
return FALSE;
}
self->opened = TRUE;
return TRUE;
}
gboolean
gst_v4l2_decoder_close (GstV4l2Decoder * self)
{
GstV4l2Request *request;
while ((request = gst_queue_array_pop_head (self->pending_requests)))
gst_v4l2_request_unref (request);
while ((request = gst_queue_array_pop_head (self->request_pool)))
gst_v4l2_request_free (request);
if (self->media_fd)
close (self->media_fd);
if (self->video_fd)
close (self->video_fd);
self->media_fd = 0;
self->video_fd = 0;
self->opened = FALSE;
return TRUE;
}
gboolean
gst_v4l2_decoder_streamon (GstV4l2Decoder * self, GstPadDirection direction)
{
gint ret;
guint32 type = direction_to_buffer_type (self, direction);
ret = ioctl (self->video_fd, VIDIOC_STREAMON, &type);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_STREAMON failed: %s", g_strerror (errno));
return FALSE;
}
return TRUE;
}
gboolean
gst_v4l2_decoder_streamoff (GstV4l2Decoder * self, GstPadDirection direction)
{
guint32 type = direction_to_buffer_type (self, direction);
gint ret;
if (direction == GST_PAD_SRC) {
GstV4l2Request *pending_req;
/* STREAMOFF have the effect of cancelling all requests and unqueuing all
* buffers, so clear the pending request list */
while ((pending_req = gst_queue_array_pop_head (self->pending_requests))) {
g_clear_pointer (&pending_req->bitstream, gst_memory_unref);
pending_req->pending = FALSE;
gst_v4l2_request_unref (pending_req);
}
}
ret = ioctl (self->video_fd, VIDIOC_STREAMOFF, &type);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_STREAMOFF failed: %s", g_strerror (errno));
return FALSE;
}
return TRUE;
}
gboolean
gst_v4l2_decoder_flush (GstV4l2Decoder * self)
{
/* We ignore streamoff failure as it's not relevant, if we manage to
* streamon again, we are good. */
gst_v4l2_decoder_streamoff (self, GST_PAD_SINK);
gst_v4l2_decoder_streamoff (self, GST_PAD_SRC);
return gst_v4l2_decoder_streamon (self, GST_PAD_SINK) &&
gst_v4l2_decoder_streamon (self, GST_PAD_SRC);
}
gboolean
gst_v4l2_decoder_enum_sink_fmt (GstV4l2Decoder * self, gint i,
guint32 * out_fmt)
{
struct v4l2_fmtdesc fmtdesc = { i, self->sink_buf_type, };
gint ret;
g_return_val_if_fail (self->opened, FALSE);
ret = ioctl (self->video_fd, VIDIOC_ENUM_FMT, &fmtdesc);
if (ret < 0) {
if (errno != EINVAL)
GST_ERROR_OBJECT (self, "VIDIOC_ENUM_FMT failed: %s", g_strerror (errno));
return FALSE;
}
GST_DEBUG_OBJECT (self, "Found format %" GST_FOURCC_FORMAT " (%s)",
GST_FOURCC_ARGS (fmtdesc.pixelformat), fmtdesc.description);
*out_fmt = fmtdesc.pixelformat;
return TRUE;
}
gboolean
gst_v4l2_decoder_set_sink_fmt (GstV4l2Decoder * self, guint32 pix_fmt,
gint width, gint height, gint pixel_bitdepth)
{
struct v4l2_format format = (struct v4l2_format) {
.type = self->sink_buf_type,
/* Compatible with .fmt.pix for these field */
.fmt.pix_mp = (struct v4l2_pix_format_mplane) {
.pixelformat = pix_fmt,
.width = width,
.height = height,
},
};
gint ret;
/* Using raw image size for now, it is guarantied to be large enough */
gsize sizeimage = MAX (IMAGE_MINSZ, (width * height * pixel_bitdepth) / 8);
if (self->mplane)
format.fmt.pix_mp.plane_fmt[0].sizeimage = sizeimage;
else
format.fmt.pix.sizeimage = sizeimage;
ret = ioctl (self->video_fd, VIDIOC_S_FMT, &format);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_S_FMT failed: %s", g_strerror (errno));
return FALSE;
}
if (format.fmt.pix_mp.pixelformat != pix_fmt
|| format.fmt.pix_mp.width < width || format.fmt.pix_mp.height < height) {
GST_WARNING_OBJECT (self, "Failed to set sink format to %"
GST_FOURCC_FORMAT " %ix%i", GST_FOURCC_ARGS (pix_fmt), width, height);
errno = EINVAL;
return FALSE;
}
return TRUE;
}
static GstCaps *
gst_v4l2_decoder_enum_size_for_format (GstV4l2Decoder * self,
guint32 pixelformat, gint index, gint unscaled_width, gint unscaled_height)
{
struct v4l2_frmsizeenum size;
GstVideoFormat format;
gint ret;
gboolean res;
memset (&size, 0, sizeof (struct v4l2_frmsizeenum));
size.index = index;
size.pixel_format = pixelformat;
GST_DEBUG_OBJECT (self, "enumerate size index %d for %" GST_FOURCC_FORMAT,
index, GST_FOURCC_ARGS (pixelformat));
ret = ioctl (self->video_fd, VIDIOC_ENUM_FRAMESIZES, &size);
if (ret < 0)
return NULL;
if (size.type != V4L2_FRMSIZE_TYPE_DISCRETE) {
GST_WARNING_OBJECT (self, "V4L2_FRMSIZE type not supported");
return NULL;
}
if (gst_util_fraction_compare (unscaled_width, unscaled_height,
size.discrete.width, size.discrete.height)) {
GST_DEBUG_OBJECT (self,
"Pixel ratio modification not supported %dx%d %dx%d (%d)",
unscaled_width, unscaled_height, size.discrete.width,
size.discrete.height, ret);
return NULL;
}
res = gst_v4l2_format_to_video_format (pixelformat, &format);
g_assert (res);
GST_DEBUG_OBJECT (self, "get size (%d x %d) index %d for %" GST_FOURCC_FORMAT,
size.discrete.width, size.discrete.height, index,
GST_FOURCC_ARGS (pixelformat));
return gst_caps_new_simple ("video/x-raw",
"width", G_TYPE_INT, size.discrete.width,
"height", G_TYPE_INT, size.discrete.height, NULL);
}
static GstCaps *
gst_v4l2_decoder_probe_caps_for_format (GstV4l2Decoder * self,
guint32 pixelformat, gint unscaled_width, gint unscaled_height)
{
gint index = 0;
GstCaps *caps, *tmp, *size_caps;
GstVideoFormat format;
guint32 drm_fourcc;
GST_DEBUG_OBJECT (self, "enumerate size for %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (pixelformat));
if (!gst_v4l2_format_to_video_format (pixelformat, &format))
return gst_caps_new_empty ();
caps = gst_caps_new_simple ("video/x-raw", "format", G_TYPE_STRING,
gst_video_format_to_string (format), NULL);
size_caps = gst_caps_new_empty ();
while ((tmp = gst_v4l2_decoder_enum_size_for_format (self, pixelformat,
index++, unscaled_width, unscaled_height))) {
size_caps = gst_caps_merge (size_caps, tmp);
}
if (!gst_caps_is_empty (size_caps)) {
tmp = caps;
caps = gst_caps_intersect_full (tmp, size_caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (tmp);
}
/* TODO: Add a V4L2 to DRM fourcc translator for formats that we don't support
* in software.
*/
drm_fourcc = gst_video_dma_drm_fourcc_from_format (format);
if (drm_fourcc /* != DRM_FORMAT_INVALID */ ) {
GstCaps *drm_caps;
drm_caps = gst_caps_new_simple ("video/x-raw", "format", G_TYPE_STRING,
"DMA_DRM", "drm-format", G_TYPE_STRING,
gst_video_dma_drm_fourcc_to_string (drm_fourcc, 0), NULL);
gst_caps_set_features_simple (drm_caps,
gst_caps_features_from_string (GST_CAPS_FEATURE_MEMORY_DMABUF));
if (!gst_caps_is_empty (size_caps)) {
gst_caps_set_features_simple (size_caps,
gst_caps_features_from_string (GST_CAPS_FEATURE_MEMORY_DMABUF));
tmp = drm_caps;
drm_caps =
gst_caps_intersect_full (tmp, size_caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (tmp);
}
caps = gst_caps_merge (drm_caps, caps);
}
gst_caps_unref (size_caps);
return caps;
}
GstCaps *
gst_v4l2_decoder_enum_src_formats (GstV4l2Decoder * self,
GstStaticCaps * static_filter)
{
gint ret;
struct v4l2_format fmt = {
.type = self->src_buf_type,
};
GstCaps *caps, *filter, *tmp;
gint i;
g_return_val_if_fail (self->opened, FALSE);
ret = ioctl (self->video_fd, VIDIOC_G_FMT, &fmt);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_G_FMT failed: %s", g_strerror (errno));
return FALSE;
}
caps =
gst_v4l2_decoder_probe_caps_for_format (self,
fmt.fmt.pix_mp.pixelformat, fmt.fmt.pix_mp.width, fmt.fmt.pix_mp.height);
/* And then enumerate other possible formats and place that as a second
* structure in the caps */
for (i = 0; ret >= 0; i++) {
struct v4l2_fmtdesc fmtdesc = { i, self->src_buf_type, };
ret = ioctl (self->video_fd, VIDIOC_ENUM_FMT, &fmtdesc);
if (ret < 0) {
if (errno != EINVAL)
GST_ERROR_OBJECT (self, "VIDIOC_ENUM_FMT failed: %s",
g_strerror (errno));
continue;
}
tmp = gst_v4l2_decoder_probe_caps_for_format (self, fmtdesc.pixelformat,
fmt.fmt.pix_mp.width, fmt.fmt.pix_mp.height);
caps = gst_caps_merge (caps, tmp);
}
filter = gst_static_caps_get (static_filter);
tmp = caps;
caps = gst_caps_intersect_full (tmp, filter, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (tmp);
gst_caps_unref (filter);
GST_DEBUG_OBJECT (self, "Probed caps: %" GST_PTR_FORMAT, caps);
return caps;
}
gboolean
gst_v4l2_decoder_select_src_format (GstV4l2Decoder * self, GstCaps * caps,
GstVideoInfo * vinfo, GstVideoInfoDmaDrm * vinfo_drm)
{
gint ret;
struct v4l2_format fmt = {
.type = self->src_buf_type,
};
GstVideoFormat format;
guint32 pix_fmt;
GstVideoInfo tmp_vinfo;
GstVideoInfoDmaDrm tmp_vinfo_drm;
if (gst_caps_is_empty (caps))
return FALSE;
ret = ioctl (self->video_fd, VIDIOC_G_FMT, &fmt);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_G_FMT failed: %s", g_strerror (errno));
return FALSE;
}
gst_video_info_init (&tmp_vinfo);
gst_video_info_dma_drm_init (&tmp_vinfo_drm);
GST_DEBUG_OBJECT (self, "Original caps: %" GST_PTR_FORMAT, caps);
caps = gst_caps_fixate (caps);
GST_DEBUG_OBJECT (self, "Fixated caps: %" GST_PTR_FORMAT, caps);
if (gst_video_info_dma_drm_from_caps (&tmp_vinfo_drm, caps)) {
format = tmp_vinfo_drm.vinfo.finfo->format;
} else if (gst_video_info_from_caps (&tmp_vinfo, caps)) {
format = tmp_vinfo.finfo->format;
} else {
GST_WARNING_OBJECT (self, "Can't transform caps into video info!");
return FALSE;
}
if (!gst_v4l2_format_from_video_format (format, &pix_fmt)) {
GST_ERROR_OBJECT (self, "Unsupported V4L2 pixelformat %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (fmt.fmt.pix_mp.pixelformat));
return FALSE;
}
if (pix_fmt != fmt.fmt.pix_mp.pixelformat) {
GST_WARNING_OBJECT (self, "Trying to use peer format: %s",
gst_video_format_to_string (format));
fmt.fmt.pix_mp.pixelformat = pix_fmt;
ret = ioctl (self->video_fd, VIDIOC_S_FMT, &fmt);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_S_FMT failed: %s", g_strerror (errno));
return FALSE;
}
}
if (!gst_v4l2_format_to_video_info (&fmt, vinfo)) {
GST_ERROR_OBJECT (self, "Unsupported V4L2 pixelformat %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (fmt.fmt.pix_mp.pixelformat));
return FALSE;
}
if (tmp_vinfo_drm.drm_fourcc) {
if (!gst_video_info_dma_drm_from_video_info (vinfo_drm, vinfo, 0)) {
GST_ERROR_OBJECT (self,
"Unsupported V4L2 pixelformat for DRM %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (fmt.fmt.pix_mp.pixelformat));
return FALSE;
}
} else {
gst_video_info_dma_drm_init (vinfo_drm);
}
GST_INFO_OBJECT (self, "Selected format %s %ix%i",
gst_video_format_to_string (vinfo->finfo->format),
vinfo->width, vinfo->height);
return TRUE;
}
GstVideoCodecState *
gst_v4l2_decoder_set_output_state (GstVideoDecoder * decoder,
GstVideoInfo * vinfo, GstVideoInfoDmaDrm * vinfo_drm, guint width,
guint height, GstVideoCodecState * reference)
{
GstVideoCodecState *state;
state = gst_video_decoder_set_output_state (decoder, vinfo->finfo->format,
width, height, reference);
if (vinfo_drm->drm_fourcc /* != DRM_FORMAT_INVALID */ ) {
GstVideoInfoDmaDrm tmp_vinfo_drm;
gst_video_info_dma_drm_from_video_info (&tmp_vinfo_drm, &state->info, 0);
state->caps = gst_video_info_dma_drm_to_caps (&tmp_vinfo_drm);
} else {
state->caps = gst_video_info_to_caps (&state->info);
}
GST_DEBUG_OBJECT (decoder, "Setting caps: %" GST_PTR_FORMAT, state->caps);
return state;
}
gint
gst_v4l2_decoder_request_buffers (GstV4l2Decoder * self,
GstPadDirection direction, guint num_buffers)
{
gint ret;
struct v4l2_requestbuffers reqbufs = {
.count = num_buffers,
.memory = V4L2_MEMORY_MMAP,
.type = direction_to_buffer_type (self, direction),
};
GST_DEBUG_OBJECT (self, "Requesting %u buffers", num_buffers);
ret = ioctl (self->video_fd, VIDIOC_REQBUFS, &reqbufs);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_REQBUFS failed: %s", g_strerror (errno));
return ret;
}
if (direction == GST_PAD_SINK) {
if (reqbufs.capabilities & V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF)
self->supports_holding_capture = TRUE;
else
self->supports_holding_capture = FALSE;
}
return reqbufs.count;
}
gboolean
gst_v4l2_decoder_export_buffer (GstV4l2Decoder * self,
GstPadDirection direction, gint index, gint * fds, gsize * sizes,
gsize * offsets, guint * num_fds)
{
gint i, ret;
struct v4l2_plane planes[GST_VIDEO_MAX_PLANES] = { {0} };
struct v4l2_buffer v4l2_buf = {
.index = index,
.type = direction_to_buffer_type (self, direction),
};
if (self->mplane) {
v4l2_buf.length = GST_VIDEO_MAX_PLANES;
v4l2_buf.m.planes = planes;
}
ret = ioctl (self->video_fd, VIDIOC_QUERYBUF, &v4l2_buf);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_QUERYBUF failed: %s", g_strerror (errno));
return FALSE;
}
if (self->mplane) {
for (i = 0; i < v4l2_buf.length; i++) {
struct v4l2_plane *plane = v4l2_buf.m.planes + i;
struct v4l2_exportbuffer expbuf = {
.type = direction_to_buffer_type (self, direction),
.index = index,
.plane = i,
.flags = O_CLOEXEC | O_RDWR,
};
ret = ioctl (self->video_fd, VIDIOC_EXPBUF, &expbuf);
if (ret < 0) {
gint j;
GST_ERROR_OBJECT (self, "VIDIOC_EXPBUF failed: %s", g_strerror (errno));
for (j = i - 1; j >= 0; j--)
close (fds[j]);
return FALSE;
}
*num_fds = v4l2_buf.length;
fds[i] = expbuf.fd;
sizes[i] = plane->length;
offsets[i] = plane->data_offset;
}
} else {
struct v4l2_exportbuffer expbuf = {
.type = direction_to_buffer_type (self, direction),
.index = index,
.flags = O_CLOEXEC | O_RDWR,
};
ret = ioctl (self->video_fd, VIDIOC_EXPBUF, &expbuf);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_EXPBUF failed: %s", g_strerror (errno));
return FALSE;
}
*num_fds = 1;
fds[0] = expbuf.fd;
sizes[0] = v4l2_buf.length;
offsets[0] = 0;
}
return TRUE;
}
static gboolean
gst_v4l2_decoder_queue_sink_mem (GstV4l2Decoder * self,
GstV4l2Request * request, GstMemory * mem, guint32 frame_num, guint flags)
{
gint ret;
gsize bytesused = gst_memory_get_sizes (mem, NULL, NULL);
struct v4l2_plane plane = {
.bytesused = bytesused,
};
struct v4l2_buffer buf = {
.type = self->sink_buf_type,
.memory = V4L2_MEMORY_MMAP,
.index = gst_v4l2_codec_memory_get_index (mem),
v4l2codecs: Avoid QBUF/DQBUF struct timeval .tv_usec wrap-around at frame 1000000 When decoding stream using hardware V4L2 decoder element, in any of the currently supported formats, the decoding will fail once frame number 1000000 is reached. The reported error clearly indicates a wrap-around occured, instead of receiving decoded frame 1000000, frame 0 is received from the hardware V4L2 decoder driver. The problem is actually not in the driver itself, but rather in gstreamer, which uses `struct v4l2_buffer` member `.timestamp` in a special way. The timestamp of buffers with encoded data added to the SINK (input) queue of the driver is copied by the driver into matching buffers with decoded data added to the SOURCE (output) queue of the driver. In fact, the timestamp is not a timestamp at all, but rather in this special case, only part of it is used as an incrementing frame counter. The `.timestamp` is of type `struct timeval`, which is defined in `sys/time.h` [1]. Only the `tv_usec` member of this structure is used for the incrementing frame counter. However, suseconds_t tv_usec [2] may be limited to range [-1, 1000000]: " [XSI] The type suseconds_t shall be a signed integer type capable of storing values at least in the range [-1, 1000000]. " Therefore, once frame 1000000 is reached, a rollover occurs and decoding fails. Fix this by using both `struct timeval` members, `.tv_sec` and `.tv_usec` with matching modular arithmetic, this way the failure would occur again just short of 2^84 frames, which should be plenty. [1] https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_time.h.html [2] https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_types.h.html A test case using stateless hardware h264 decoder, the WARN/ERROR output in gstreamer log indicates a failure occurred. With this change, that error no longer occurs and the WARN/ERROR are not present: ``` pc$ gst-launch-1.0 videotestsrc num-buffers=1001001 pattern=6 ! \ video/x-raw,width=16,height=16,format=I420 ! \ x264enc ! filesink location=/tmp/test.h264 dut$ GST_DEBUG="*:3" gst-launch-1.0 filesrc location=/tmp/test.h264 ! \ h264parse ! v4l2slh264dec ! fakesink ... 0:03:51.393677606 12111 0x370df400 WARN \ v4l2codecs-decoder gstv4l2decoder.c:1157:gst_v4l2_request_set_done:<v4l2decoder2> \ Requested frame 1000000, but driver returned frame 0. 0:03:51.394140597 12111 0x370df400 WARN \ v4l2codecs-decoder gstv4l2decoder.c:1157:gst_v4l2_request_set_done:<v4l2decoder2> \ Requested frame 1000001, but driver returned frame 1. 0:03:51.394425216 12111 0x370df400 WARN \ v4l2codecs-decoder gstv4l2decoder.c:1157:gst_v4l2_request_set_done:<v4l2decoder2> \ Requested frame 1000002, but driver returned frame 2. 0:03:51.394665211 12111 0x370df400 WARN \ v4l2codecs-decoder gstv4l2decoder.c:1157:gst_v4l2_request_set_done:<v4l2decoder2> \ Requested frame 1000003, but driver returned frame 3. 0:03:51.394785833 12111 0x370df400 WARN \ v4l2codecs-h264dec gstv4l2codech264dec.c:1059:gst_v4l2_codec_h264_dec_output_picture:<v4l2slh264dec0> \ error: Failed to decode frame 1000000 ERROR: from element /GstPipeline:pipeline0/v4l2slh264dec:v4l2slh264dec0: Failed to decode frame 1000000 ``` Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5598>
2023-11-04 02:16:47 +00:00
.timestamp.tv_sec = frame_num / 1000000,
.timestamp.tv_usec = frame_num % 1000000,
.request_fd = request->fd,
.flags = V4L2_BUF_FLAG_REQUEST_FD | flags,
};
GST_TRACE_OBJECT (self, "Queueing bitstream buffer %i", buf.index);
if (self->mplane) {
buf.length = 1;
buf.m.planes = &plane;
} else {
buf.bytesused = bytesused;
}
ret = ioctl (self->video_fd, VIDIOC_QBUF, &buf);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_QBUF failed: %s", g_strerror (errno));
return FALSE;
}
return TRUE;
}
static gboolean
gst_v4l2_decoder_queue_src_buffer (GstV4l2Decoder * self, GstBuffer * buffer)
{
gint i, ret;
struct v4l2_plane planes[GST_VIDEO_MAX_PLANES];
struct v4l2_buffer buf = {
.type = self->src_buf_type,
.memory = V4L2_MEMORY_MMAP,
.index = gst_v4l2_codec_buffer_get_index (buffer),
};
GST_TRACE_OBJECT (self, "Queuing picture buffer %i", buf.index);
if (self->mplane) {
buf.length = gst_buffer_n_memory (buffer);
buf.m.planes = planes;
for (i = 0; i < buf.length; i++) {
GstMemory *mem = gst_buffer_peek_memory (buffer, i);
/* *INDENT-OFF* */
planes[i] = (struct v4l2_plane) {
.bytesused = gst_memory_get_sizes (mem, NULL, NULL),
};
/* *INDENT-ON* */
}
} else {
buf.bytesused = gst_buffer_get_size (buffer);
}
ret = ioctl (self->video_fd, VIDIOC_QBUF, &buf);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_QBUF failed: %s", g_strerror (errno));
return FALSE;
}
return TRUE;
}
static gboolean
gst_v4l2_decoder_dequeue_sink (GstV4l2Decoder * self)
{
gint ret;
struct v4l2_plane planes[GST_VIDEO_MAX_PLANES] = { {0} };
struct v4l2_buffer buf = {
.type = self->sink_buf_type,
.memory = V4L2_MEMORY_MMAP,
};
if (self->mplane) {
buf.length = GST_VIDEO_MAX_PLANES;
buf.m.planes = planes;
}
ret = ioctl (self->video_fd, VIDIOC_DQBUF, &buf);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_DQBUF failed: %s", g_strerror (errno));
return FALSE;
}
GST_TRACE_OBJECT (self, "Dequeued bitstream buffer %i", buf.index);
return TRUE;
}
static gboolean
gst_v4l2_decoder_dequeue_src (GstV4l2Decoder * self, guint32 * out_frame_num)
{
gint ret;
struct v4l2_plane planes[GST_VIDEO_MAX_PLANES] = { {0} };
struct v4l2_buffer buf = {
.type = self->src_buf_type,
.memory = V4L2_MEMORY_MMAP,
};
if (self->mplane) {
buf.length = GST_VIDEO_MAX_PLANES;
buf.m.planes = planes;
}
ret = ioctl (self->video_fd, VIDIOC_DQBUF, &buf);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_DQBUF failed: %s", g_strerror (errno));
return FALSE;
}
v4l2codecs: Avoid QBUF/DQBUF struct timeval .tv_usec wrap-around at frame 1000000 When decoding stream using hardware V4L2 decoder element, in any of the currently supported formats, the decoding will fail once frame number 1000000 is reached. The reported error clearly indicates a wrap-around occured, instead of receiving decoded frame 1000000, frame 0 is received from the hardware V4L2 decoder driver. The problem is actually not in the driver itself, but rather in gstreamer, which uses `struct v4l2_buffer` member `.timestamp` in a special way. The timestamp of buffers with encoded data added to the SINK (input) queue of the driver is copied by the driver into matching buffers with decoded data added to the SOURCE (output) queue of the driver. In fact, the timestamp is not a timestamp at all, but rather in this special case, only part of it is used as an incrementing frame counter. The `.timestamp` is of type `struct timeval`, which is defined in `sys/time.h` [1]. Only the `tv_usec` member of this structure is used for the incrementing frame counter. However, suseconds_t tv_usec [2] may be limited to range [-1, 1000000]: " [XSI] The type suseconds_t shall be a signed integer type capable of storing values at least in the range [-1, 1000000]. " Therefore, once frame 1000000 is reached, a rollover occurs and decoding fails. Fix this by using both `struct timeval` members, `.tv_sec` and `.tv_usec` with matching modular arithmetic, this way the failure would occur again just short of 2^84 frames, which should be plenty. [1] https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_time.h.html [2] https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_types.h.html A test case using stateless hardware h264 decoder, the WARN/ERROR output in gstreamer log indicates a failure occurred. With this change, that error no longer occurs and the WARN/ERROR are not present: ``` pc$ gst-launch-1.0 videotestsrc num-buffers=1001001 pattern=6 ! \ video/x-raw,width=16,height=16,format=I420 ! \ x264enc ! filesink location=/tmp/test.h264 dut$ GST_DEBUG="*:3" gst-launch-1.0 filesrc location=/tmp/test.h264 ! \ h264parse ! v4l2slh264dec ! fakesink ... 0:03:51.393677606 12111 0x370df400 WARN \ v4l2codecs-decoder gstv4l2decoder.c:1157:gst_v4l2_request_set_done:<v4l2decoder2> \ Requested frame 1000000, but driver returned frame 0. 0:03:51.394140597 12111 0x370df400 WARN \ v4l2codecs-decoder gstv4l2decoder.c:1157:gst_v4l2_request_set_done:<v4l2decoder2> \ Requested frame 1000001, but driver returned frame 1. 0:03:51.394425216 12111 0x370df400 WARN \ v4l2codecs-decoder gstv4l2decoder.c:1157:gst_v4l2_request_set_done:<v4l2decoder2> \ Requested frame 1000002, but driver returned frame 2. 0:03:51.394665211 12111 0x370df400 WARN \ v4l2codecs-decoder gstv4l2decoder.c:1157:gst_v4l2_request_set_done:<v4l2decoder2> \ Requested frame 1000003, but driver returned frame 3. 0:03:51.394785833 12111 0x370df400 WARN \ v4l2codecs-h264dec gstv4l2codech264dec.c:1059:gst_v4l2_codec_h264_dec_output_picture:<v4l2slh264dec0> \ error: Failed to decode frame 1000000 ERROR: from element /GstPipeline:pipeline0/v4l2slh264dec:v4l2slh264dec0: Failed to decode frame 1000000 ``` Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5598>
2023-11-04 02:16:47 +00:00
*out_frame_num = buf.timestamp.tv_usec + buf.timestamp.tv_sec * 1000000;
GST_TRACE_OBJECT (self, "Dequeued picture buffer %i", buf.index);
return TRUE;
}
gboolean
gst_v4l2_decoder_set_controls (GstV4l2Decoder * self, GstV4l2Request * request,
struct v4l2_ext_control *control, guint count)
{
gint ret;
struct v4l2_ext_controls controls = {
.controls = control,
.count = count,
.request_fd = request ? request->fd : 0,
.which = request ? V4L2_CTRL_WHICH_REQUEST_VAL : 0,
};
ret = ioctl (self->video_fd, VIDIOC_S_EXT_CTRLS, &controls);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_S_EXT_CTRLS failed: %s",
g_strerror (errno));
return FALSE;
}
return TRUE;
}
gboolean
gst_v4l2_decoder_get_controls (GstV4l2Decoder * self,
struct v4l2_ext_control *control, guint count)
{
gint ret;
struct v4l2_ext_controls controls = {
.controls = control,
.count = count,
};
ret = ioctl (self->video_fd, VIDIOC_G_EXT_CTRLS, &controls);
if (ret < 0) {
GST_ERROR_OBJECT (self, "VIDIOC_G_EXT_CTRLS failed: %s",
g_strerror (errno));
return FALSE;
}
return TRUE;
}
gboolean
gst_v4l2_decoder_query_control_size (GstV4l2Decoder * self,
unsigned int control_id, unsigned int *control_size)
{
gint ret;
struct v4l2_query_ext_ctrl control = {
.id = control_id,
};
if (control_size)
*control_size = 0;
ret = ioctl (self->video_fd, VIDIOC_QUERY_EXT_CTRL, &control);
if (ret < 0)
/*
* It's not an error if a control is not supported by this driver.
* Return false but don't print any error.
*/
return FALSE;
if (control_size)
*control_size = control.elem_size;
return TRUE;
}
void
gst_v4l2_decoder_install_properties (GObjectClass * gobject_class,
gint prop_offset, GstV4l2CodecDevice * device)
{
const gchar *media_device_path = NULL;
const gchar *video_device_path = NULL;
if (device) {
media_device_path = device->media_device_path;
video_device_path = device->video_device_path;
}
g_object_class_install_property (gobject_class, PROP_MEDIA_DEVICE,
g_param_spec_string ("media-device", "Media Device Path",
"Path to the media device node", media_device_path,
G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_VIDEO_DEVICE,
g_param_spec_string ("video-device", "Video Device Path",
"Path to the video device node", video_device_path,
G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
void
gst_v4l2_decoder_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstV4l2Decoder *self = GST_V4L2_DECODER (object);
switch (prop_id) {
case PROP_MEDIA_DEVICE:
g_free (self->media_device);
self->media_device = g_value_dup_string (value);
break;
case PROP_VIDEO_DEVICE:
g_free (self->video_device);
self->video_device = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
void
gst_v4l2_decoder_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstV4l2Decoder *self = GST_V4L2_DECODER (object);
switch (prop_id) {
case PROP_MEDIA_DEVICE:
g_value_set_string (value, self->media_device);
break;
case PROP_VIDEO_DEVICE:
g_value_set_string (value, self->video_device);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gst_v4l2_decoder_register:
* @plugin: a #GstPlugin
* @dec_type: A #GType for the codec
* @class_init: The #GClassInitFunc for #dec_type
* @instance_init: The #GInstanceInitFunc for #dec_type
* @element_name_tmpl: A string to use for the first codec found and as a template for the next ones.
* @device: (transfer full) A #GstV4l2CodecDevice
* @rank: The rank to use for the element
* @class_data: (nullable) (transfer full) A #gpointer to pass as class_data, set to @device if null
* @element_name (nullable) (out) Sets the pointer to the new element name
*
* Registers a decoder element as a subtype of @dec_type for @plugin.
* Will create a different sub_types for each subsequent @decoder of the
* same type.
*/
void
gst_v4l2_decoder_register (GstPlugin * plugin,
GType dec_type, GClassInitFunc class_init, gconstpointer class_data,
GInstanceInitFunc instance_init, const gchar * element_name_tmpl,
GstV4l2CodecDevice * device, guint rank, gchar ** element_name)
{
GTypeQuery type_query;
GTypeInfo type_info = { 0, };
GType subtype;
gchar *type_name;
g_type_query (dec_type, &type_query);
memset (&type_info, 0, sizeof (type_info));
type_info.class_size = type_query.class_size;
type_info.instance_size = type_query.instance_size;
type_info.class_init = class_init;
type_info.class_data = class_data;
type_info.instance_init = instance_init;
if (class_data == device)
GST_MINI_OBJECT_FLAG_SET (device, GST_MINI_OBJECT_FLAG_MAY_BE_LEAKED);
/* The first decoder to be registered should use a constant name, like
* v4l2slvp8dec, for any additional decoders, we create unique names. Decoder
* names may change between boots, so this should help gain stable names for
* the most common use cases. SL stands for state-less, we differentiate
* with v4l2vp8dec as this element may not have the same properties */
type_name = g_strdup_printf (element_name_tmpl, "");
if (g_type_from_name (type_name) != 0) {
gchar *basename = g_path_get_basename (device->video_device_path);
g_free (type_name);
type_name = g_strdup_printf (element_name_tmpl, basename);
g_free (basename);
}
subtype = g_type_register_static (dec_type, type_name, &type_info, 0);
if (!gst_element_register (plugin, type_name, rank, subtype)) {
GST_WARNING ("Failed to register plugin '%s'", type_name);
g_free (type_name);
type_name = NULL;
}
if (element_name)
*element_name = type_name;
else
g_free (type_name);
}
/*
* gst_v4l2_decoder_alloc_request:
* @self a #GstV4l2Decoder pointer
* @frame_num: Used as a timestamp to identify references
* @bitstream the #GstMemory that holds the bitstream data
* @pic_buf the #GstBuffer holding the decoded picture
*
* Allocate a Linux media request file descriptor. This request wrapper will
* hold a reference to the requested bitstream memory to decoded and the
* picture buffer this request will decode to. This will be used for
* transparent management of the V4L2 queues.
*
* Returns: a new #GstV4l2Request
*/
GstV4l2Request *
gst_v4l2_decoder_alloc_request (GstV4l2Decoder * self, guint32 frame_num,
GstMemory * bitstream, GstBuffer * pic_buf)
{
GstV4l2Request *request = gst_queue_array_pop_head (self->request_pool);
gint ret;
if (!request) {
request = g_new0 (GstV4l2Request, 1);
ret = ioctl (self->media_fd, MEDIA_IOC_REQUEST_ALLOC, &request->fd);
if (ret < 0) {
GST_ERROR_OBJECT (self, "MEDIA_IOC_REQUEST_ALLOC failed: %s",
g_strerror (errno));
return NULL;
}
request->poll = gst_poll_new (FALSE);
gst_poll_fd_init (&request->pollfd);
request->pollfd.fd = request->fd;
gst_poll_add_fd (request->poll, &request->pollfd);
gst_poll_fd_ctl_pri (request->poll, &request->pollfd, TRUE);
}
request->decoder = g_object_ref (self);
request->bitstream = gst_memory_ref (bitstream);
request->pic_buf = gst_buffer_ref (pic_buf);
request->frame_num = frame_num;
request->ref_count = 1;
return request;
}
/*
* gst_v4l2_decoder_alloc_sub_request:
* @self a #GstV4l2Decoder pointer
* @prev_request the #GstV4l2Request this request continue
* @bitstream the #GstMemory that holds the bitstream data
*
* Allocate a Linux media request file descriptor. Similar to
* gst_v4l2_decoder_alloc_request(), but used when a request is the
* continuation of the decoding of the same picture. This is notably the case
* for subsequent slices or for second field of a frame.
*
* Returns: a new #GstV4l2Request
*/
GstV4l2Request *
gst_v4l2_decoder_alloc_sub_request (GstV4l2Decoder * self,
GstV4l2Request * prev_request, GstMemory * bitstream)
{
GstV4l2Request *request = gst_queue_array_pop_head (self->request_pool);
gint ret;
if (!request) {
request = g_new0 (GstV4l2Request, 1);
ret = ioctl (self->media_fd, MEDIA_IOC_REQUEST_ALLOC, &request->fd);
if (ret < 0) {
GST_ERROR_OBJECT (self, "MEDIA_IOC_REQUEST_ALLOC failed: %s",
g_strerror (errno));
return NULL;
}
request->poll = gst_poll_new (FALSE);
gst_poll_fd_init (&request->pollfd);
request->pollfd.fd = request->fd;
gst_poll_add_fd (request->poll, &request->pollfd);
gst_poll_fd_ctl_pri (request->poll, &request->pollfd, TRUE);
}
request->decoder = g_object_ref (self);
request->bitstream = gst_memory_ref (bitstream);
request->pic_buf = gst_buffer_ref (prev_request->pic_buf);
request->frame_num = prev_request->frame_num;
request->sub_request = TRUE;
request->ref_count = 1;
return request;
}
/**
* gst_v4l2_decoder_set_render_delay:
* @self: a #GstV4l2Decoder pointer
* @delay: The expected render delay
*
* The decoder will adjust the number of allowed concurrent request in order
* to allow this delay. The same number of concurrent bitstream buffer will be
* used, so make sure to adjust the number of bitstream buffer.
*
* For per-slice decoder, this is the maximum number of pending slice, so the
* render backlog in frame may be less then the render delay.
*/
void
gst_v4l2_decoder_set_render_delay (GstV4l2Decoder * self, guint delay)
{
self->render_delay = delay;
}
/**
* gst_v4l2_decoder_get_render_delay:
* @self: a #GstV4l2Decoder pointer
*
* This function is used to avoid storing the render delay in multiple places.
*
* Returns: The currently configured render delay.
*/
guint
gst_v4l2_decoder_get_render_delay (GstV4l2Decoder * self)
{
return self->render_delay;
}
GstV4l2Request *
gst_v4l2_request_ref (GstV4l2Request * request)
{
request->ref_count++;
return request;
}
static void
gst_v4l2_request_free (GstV4l2Request * request)
{
GstV4l2Decoder *decoder = request->decoder;
request->decoder = NULL;
close (request->fd);
gst_poll_free (request->poll);
g_free (request);
if (decoder)
g_object_unref (decoder);
}
void
gst_v4l2_request_unref (GstV4l2Request * request)
{
GstV4l2Decoder *decoder = request->decoder;
gint ret;
g_return_if_fail (request->ref_count > 0);
if (--request->ref_count > 0)
return;
g_clear_pointer (&request->bitstream, gst_memory_unref);
g_clear_pointer (&request->pic_buf, gst_buffer_unref);
request->frame_num = G_MAXUINT32;
request->failed = FALSE;
request->hold_pic_buf = FALSE;
request->sub_request = FALSE;
if (request->pending) {
gint idx;
GST_DEBUG_OBJECT (decoder, "Freeing pending request %i.", request->fd);
idx = gst_queue_array_find (decoder->pending_requests, NULL, request);
if (idx >= 0)
gst_queue_array_drop_element (decoder->pending_requests, idx);
gst_v4l2_request_free (request);
return;
}
GST_TRACE_OBJECT (decoder, "Recycling request %i.", request->fd);
ret = ioctl (request->fd, MEDIA_REQUEST_IOC_REINIT, NULL);
if (ret < 0) {
GST_ERROR_OBJECT (request->decoder, "MEDIA_REQUEST_IOC_REINIT failed: %s",
g_strerror (errno));
gst_v4l2_request_free (request);
return;
}
gst_queue_array_push_tail (decoder->request_pool, request);
g_clear_object (&request->decoder);
}
gboolean
gst_v4l2_request_queue (GstV4l2Request * request, guint flags)
{
GstV4l2Decoder *decoder = request->decoder;
gint ret;
guint max_pending;
GST_TRACE_OBJECT (decoder, "Queuing request %i.", request->fd);
/* this would lead to stalls if we tried to use this feature and it wasn't
* supported. */
if ((flags & V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF)
&& !decoder->supports_holding_capture) {
GST_ERROR_OBJECT (decoder,
"Driver does not support holding capture buffer.");
return FALSE;
}
if (!gst_v4l2_decoder_queue_sink_mem (decoder, request,
request->bitstream, request->frame_num, flags)) {
GST_ERROR_OBJECT (decoder, "Driver did not accept the bitstream data.");
return FALSE;
}
if (!request->sub_request &&
!gst_v4l2_decoder_queue_src_buffer (decoder, request->pic_buf)) {
GST_ERROR_OBJECT (decoder, "Driver did not accept the picture buffer.");
return FALSE;
}
ret = ioctl (request->fd, MEDIA_REQUEST_IOC_QUEUE, NULL);
if (ret < 0) {
GST_ERROR_OBJECT (decoder, "MEDIA_REQUEST_IOC_QUEUE, failed: %s",
g_strerror (errno));
return FALSE;
}
if (flags & V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF)
request->hold_pic_buf = TRUE;
request->pending = TRUE;
gst_queue_array_push_tail (decoder->pending_requests,
gst_v4l2_request_ref (request));
max_pending = MAX (1, decoder->render_delay);
if (gst_queue_array_get_length (decoder->pending_requests) > max_pending) {
GstV4l2Request *pending_req;
pending_req = gst_queue_array_peek_head (decoder->pending_requests);
gst_v4l2_request_set_done (pending_req);
}
return TRUE;
}
gint
gst_v4l2_request_set_done (GstV4l2Request * request)
{
GstV4l2Decoder *decoder = request->decoder;
GstV4l2Request *pending_req = NULL;
gint ret;
if (!request->pending)
return 1;
GST_DEBUG_OBJECT (decoder, "Waiting for request %i to complete.",
request->fd);
ret = gst_poll_wait (request->poll, GST_SECOND);
if (ret == 0) {
GST_WARNING_OBJECT (decoder, "Request %i took too long.", request->fd);
return 0;
}
if (ret < 0) {
GST_WARNING_OBJECT (decoder, "Request %i error: %s (%i)",
request->fd, g_strerror (errno), errno);
return ret;
}
while ((pending_req = gst_queue_array_pop_head (decoder->pending_requests))) {
gst_v4l2_decoder_dequeue_sink (decoder);
g_clear_pointer (&pending_req->bitstream, gst_memory_unref);
if (!pending_req->hold_pic_buf) {
guint32 frame_num = G_MAXUINT32;
if (!gst_v4l2_decoder_dequeue_src (decoder, &frame_num)) {
pending_req->failed = TRUE;
} else if (frame_num != pending_req->frame_num) {
GST_WARNING_OBJECT (decoder,
"Requested frame %u, but driver returned frame %u.",
pending_req->frame_num, frame_num);
pending_req->failed = TRUE;
}
}
pending_req->pending = FALSE;
gst_v4l2_request_unref (pending_req);
if (pending_req == request)
break;
}
/* Pending request must be in the pending request list */
g_assert (pending_req == request);
return ret;
}
gboolean
gst_v4l2_request_failed (GstV4l2Request * request)
{
return request->failed;
}
GstBuffer *
gst_v4l2_request_dup_pic_buf (GstV4l2Request * request)
{
return gst_buffer_ref (request->pic_buf);
}
gint
gst_v4l2_request_get_fd (GstV4l2Request * request)
{
return request->fd;
}