gstreamer/sys/v4l2codecs/gstv4l2decoder.c
Nicolas Dufresne 24eda30bd7 v4l2codecs: Fix holding of reference picture buffer
The picture buffer (V4L2 CAPTURE buffer) was being released immediatly
when the request was done. This was problematic since even after the
request is done, the picture buffer might still be used as a reference
and should not be reused for further decoding yet.

This change effectively bind the picture buffer lifetime to the request.
So that if the picture is never showned (decode only frame) or the request
queue is full before the buffer is displayed, the picture buffer will
remain alive.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2142>
2021-04-07 19:00:21 +00:00

1144 lines
30 KiB
C

/* 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>
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;
};
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);
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 = (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;
}
GstCaps *
gst_v4l2_decoder_enum_src_formats (GstV4l2Decoder * self)
{
gint ret;
struct v4l2_format fmt = {
.type = self->src_buf_type,
};
GstVideoFormat format;
GstCaps *caps;
GValue list = G_VALUE_INIT;
GValue value = G_VALUE_INIT;
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;
}
/* We first place a structure with the default pixel format */
if (gst_v4l2_format_to_video_format (fmt.fmt.pix_mp.pixelformat, &format))
caps = gst_caps_new_simple ("video/x-raw", "format", G_TYPE_STRING,
gst_video_format_to_string (format), NULL);
else
caps = gst_caps_new_empty ();
/* And then enumerate other possible formats and place that as a second
* structure in the caps */
g_value_init (&list, GST_TYPE_LIST);
g_value_init (&value, G_TYPE_STRING);
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;
}
if (gst_v4l2_format_to_video_format (fmtdesc.pixelformat, &format)) {
g_value_set_static_string (&value, gst_video_format_to_string (format));
gst_value_list_append_value (&list, &value);
}
}
g_value_reset (&value);
if (gst_value_list_get_size (&list) > 0) {
GstStructure *str = gst_structure_new_empty ("video/x-raw");
gst_structure_take_value (str, "format", &list);
gst_caps_append_structure (caps, str);
} else {
g_value_reset (&list);
}
return caps;
}
gboolean
gst_v4l2_decoder_select_src_format (GstV4l2Decoder * self, GstCaps * caps,
GstVideoInfo * info)
{
gint ret;
struct v4l2_format fmt = {
.type = self->src_buf_type,
};
GstStructure *str;
const gchar *format_str;
GstVideoFormat format;
guint32 pix_fmt;
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;
}
caps = gst_caps_make_writable (caps);
str = gst_caps_get_structure (caps, 0);
gst_structure_fixate_field (str, "format");
format_str = gst_structure_get_string (str, "format");
format = gst_video_format_from_string (format_str);
if (gst_v4l2_format_from_video_format (format, &pix_fmt) &&
pix_fmt != fmt.fmt.pix_mp.pixelformat) {
GST_DEBUG_OBJECT (self, "Trying to use peer format: %s ", format_str);
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, info)) {
GST_ERROR_OBJECT (self, "Unsupported V4L2 pixelformat %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (fmt.fmt.pix_mp.pixelformat));
return FALSE;
}
GST_INFO_OBJECT (self, "Selected format %s %ix%i",
gst_video_format_to_string (info->finfo->format),
info->width, info->height);
return TRUE;
}
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;
}
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 = 0,
.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),
.timestamp.tv_usec = frame_num,
.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;
}
*out_frame_num = buf.timestamp.tv_usec;
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,
};
*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;
*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;
}
}
void
gst_v4l2_decoder_register (GstPlugin * plugin,
GType dec_type, GClassInitFunc class_init, GInstanceInitFunc instance_init,
const gchar * element_name_tmpl, GstV4l2CodecDevice * device, guint rank)
{
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 = gst_mini_object_ref (GST_MINI_OBJECT (device));
type_info.instance_init = instance_init;
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);
}
/*
* 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 %p.", request);
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 %p.", request);
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 %p.", request);
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;
ret = gst_poll_wait (request->poll, GST_SECOND);
if (ret <= 0)
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;
}