mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-12-24 17:20:36 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/subprojects/gst-plugins-good/sys/v4l2/gstv4l2videodec.c
Jonas Rebmann 225d6b7e11 v4l2videodec: fix freeze race condition 
This fixes a possible deadlock between gst_v4l2_video_dec_change_state
and gst_v4l2_video_dec_loop on the buffer pool.

When stopping capture, the flushing state of the v4l2 capture buffer
pool gets reverted in the processing loop after it was set via
gst_v4l2_object_unlock (self->v4l2capture) (in
gst_v4l2_video_dec_change_state). As a result, gst_v4l2_video_dec_loop
does not return and consequently, gst_pad_stop_task gets stuck waiting
for the GST_PAD_STREAM_LOCK. To circumvent this, skip acquiring the
buffer pool if stopping capture.

Suggested-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7958>
2024-11-27 17:42:11 +00:00

1501 lines
47 KiB
C
Raw Blame History

/*
* Copyright (C) 2014 Collabora Ltd.
* Author: 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 <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include "gstv4l2object.h"
#include "gstv4l2videodec.h"
#include "gstv4l2h264codec.h"
#include "gstv4l2h265codec.h"
#include "gstv4l2mpeg2codec.h"
#include "gstv4l2mpeg4codec.h"
#include "gstv4l2vp8codec.h"
#include "gstv4l2vp9codec.h"
#include <string.h>
#include <glib/gi18n-lib.h>
GST_DEBUG_CATEGORY_STATIC (gst_v4l2_video_dec_debug);
#define GST_CAT_DEFAULT gst_v4l2_video_dec_debug
typedef struct
{
gchar *device;
GstCaps *sink_caps;
GstCaps *src_caps;
const gchar *longname;
const gchar *description;
const GstV4l2Codec *codec;
} GstV4l2VideoDecCData;
enum
{
PROP_0,
V4L2_STD_OBJECT_PROPS
};
#define gst_v4l2_video_dec_parent_class parent_class
G_DEFINE_ABSTRACT_TYPE (GstV4l2VideoDec, gst_v4l2_video_dec,
GST_TYPE_VIDEO_DECODER);
static GstFlowReturn gst_v4l2_video_dec_finish (GstVideoDecoder * decoder);
static void
gst_v4l2_video_dec_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
switch (prop_id) {
case PROP_CAPTURE_IO_MODE:
if (!gst_v4l2_object_set_property_helper (self->v4l2capture,
prop_id, value, pspec)) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
break;
/* By default, only set on output */
default:
if (!gst_v4l2_object_set_property_helper (self->v4l2output,
prop_id, value, pspec)) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
break;
}
}
static void
gst_v4l2_video_dec_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
switch (prop_id) {
case PROP_CAPTURE_IO_MODE:
if (!gst_v4l2_object_get_property_helper (self->v4l2capture,
prop_id, value, pspec)) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
break;
/* By default read from output */
default:
if (!gst_v4l2_object_get_property_helper (self->v4l2output,
prop_id, value, pspec)) {
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
break;
}
}
static gboolean
gst_v4l2_video_dec_open (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GstV4l2Error error = GST_V4L2_ERROR_INIT;
GstCaps *codec_caps;
GST_DEBUG_OBJECT (self, "Opening");
if (!gst_v4l2_object_open (self->v4l2output, &error))
goto failure;
if (!gst_v4l2_object_open_shared (self->v4l2capture, self->v4l2output))
goto failure;
codec_caps = gst_pad_get_pad_template_caps (decoder->sinkpad);
self->probed_sinkcaps = gst_v4l2_object_probe_caps (self->v4l2output,
codec_caps);
gst_caps_unref (codec_caps);
if (gst_caps_is_empty (self->probed_sinkcaps))
goto no_encoded_format;
self->supports_source_change =
gst_v4l2_object_subscribe_event (self->v4l2capture,
V4L2_EVENT_SOURCE_CHANGE);
return TRUE;
no_encoded_format:
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
(_("Decoder on device %s has no supported input format"),
self->v4l2output->videodev), (NULL));
goto failure;
failure:
if (GST_V4L2_IS_OPEN (self->v4l2output))
gst_v4l2_object_close (self->v4l2output);
if (GST_V4L2_IS_OPEN (self->v4l2capture))
gst_v4l2_object_close (self->v4l2capture);
gst_caps_replace (&self->probed_srccaps, NULL);
gst_caps_replace (&self->probed_sinkcaps, NULL);
gst_v4l2_error (self, &error);
return FALSE;
}
static gboolean
gst_v4l2_video_dec_close (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GST_DEBUG_OBJECT (self, "Closing");
gst_v4l2_object_close (self->v4l2output);
gst_v4l2_object_close (self->v4l2capture);
gst_caps_replace (&self->probed_srccaps, NULL);
gst_caps_replace (&self->probed_sinkcaps, NULL);
return TRUE;
}
static gboolean
gst_v4l2_video_dec_start (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GST_DEBUG_OBJECT (self, "Starting");
gst_v4l2_object_unlock (self->v4l2output);
g_atomic_int_set (&self->active, TRUE);
self->output_flow = GST_FLOW_OK;
return TRUE;
}
static gboolean
gst_v4l2_video_dec_stop (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GST_DEBUG_OBJECT (self, "Stopping");
gst_v4l2_object_unlock (self->v4l2output);
gst_v4l2_object_unlock (self->v4l2capture);
/* Wait for capture thread to stop */
gst_pad_stop_task (decoder->srcpad);
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
self->output_flow = GST_FLOW_OK;
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
/* Should have been flushed already */
g_assert (g_atomic_int_get (&self->active) == FALSE);
gst_v4l2_object_stop (self->v4l2output);
gst_v4l2_object_stop (self->v4l2capture);
if (self->input_state) {
gst_video_codec_state_unref (self->input_state);
self->input_state = NULL;
}
GST_DEBUG_OBJECT (self, "Stopped");
return TRUE;
}
static gboolean
compatible_caps (GstV4l2VideoDec * self, GstCaps * new_caps)
{
GstCaps *current_caps, *caps1, *caps2;
GstStructure *s;
gboolean ret;
current_caps = gst_v4l2_object_get_current_caps (self->v4l2output);
if (!current_caps)
return FALSE;
caps1 = gst_caps_copy (current_caps);
s = gst_caps_get_structure (caps1, 0);
gst_structure_remove_field (s, "framerate");
caps2 = gst_caps_copy (new_caps);
s = gst_caps_get_structure (caps2, 0);
gst_structure_remove_field (s, "framerate");
ret = gst_caps_is_equal (caps1, caps2);
gst_caps_unref (caps1);
gst_caps_unref (caps2);
gst_caps_unref (current_caps);
return ret;
}
static gboolean
gst_v4l2_video_dec_set_format (GstVideoDecoder * decoder,
GstVideoCodecState * state)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GstV4l2Error error = GST_V4L2_ERROR_INIT;
gboolean ret = TRUE;
gboolean dyn_resolution = self->v4l2output->fmtdesc &&
(self->v4l2output->fmtdesc->flags & V4L2_FMT_FLAG_DYN_RESOLUTION);
GST_DEBUG_OBJECT (self, "Setting format: %" GST_PTR_FORMAT, state->caps);
if (self->input_state && !dyn_resolution) {
if (compatible_caps (self, state->caps)) {
GST_DEBUG_OBJECT (self, "Compatible caps");
goto done;
}
gst_video_codec_state_unref (self->input_state);
self->input_state = NULL;
gst_v4l2_video_dec_finish (decoder);
gst_v4l2_object_stop (self->v4l2output);
/* The renegotiation flow don't blend with the base class flow. To properly
* stop the capture pool, if the buffers can't be orphaned, we need to
* reclaim our buffers, which will happend through the allocation query.
* The allocation query is triggered by gst_video_decoder_negotiate() which
* requires the output caps to be set, but we can't know this information
* as we rely on the decoder, which requires the capture queue to be
* stopped.
*
* To workaround this issue, we simply run an allocation query with the
* old negotiated caps in order to drain/reclaim our buffers. That breaks
* the complexity and should not have much impact in performance since the
* following allocation query will happen on a drained pipeline and won't
* block. */
if (!gst_v4l2_buffer_pool_orphan (self->v4l2capture)) {
GstCaps *caps = gst_pad_get_current_caps (decoder->srcpad);
if (caps) {
GstQuery *query = gst_query_new_allocation (caps, FALSE);
gst_pad_peer_query (decoder->srcpad, query);
gst_query_unref (query);
gst_caps_unref (caps);
}
}
gst_v4l2_object_stop (self->v4l2capture);
self->output_flow = GST_FLOW_OK;
}
/* No V4L2_FMT_FLAG_DYN_RESOLUTION or no fmtdesc set yet */
if (!dyn_resolution)
ret = gst_v4l2_object_set_format (self->v4l2output, state->caps, &error);
if (ret)
self->input_state = gst_video_codec_state_ref (state);
else
gst_v4l2_error (self, &error);
done:
return ret;
}
static gboolean
gst_v4l2_video_dec_flush (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GST_DEBUG_OBJECT (self, "Flushed");
/* Ensure the processing thread has stopped for the reverse playback
* discount case */
if (gst_pad_get_task_state (decoder->srcpad) == GST_TASK_STARTED) {
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
gst_v4l2_object_unlock (self->v4l2output);
gst_v4l2_object_unlock (self->v4l2capture);
gst_pad_stop_task (decoder->srcpad);
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
}
if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
return TRUE;
self->output_flow = GST_FLOW_OK;
gst_v4l2_object_unlock_stop (self->v4l2output);
gst_v4l2_object_unlock_stop (self->v4l2capture);
gst_v4l2_buffer_pool_flush (self->v4l2output);
/* gst_v4l2_buffer_pool_flush() calls streamon the capture pool and must be
* called after gst_v4l2_object_unlock_stop() stopped flushing the buffer
* pool. If the resolution has changed before we stopped the driver we must
* reallocate the capture pool. We simply discard the pool, and let the
* capture thread handle re-allocation.*/
if (gst_v4l2_buffer_pool_flush (self->v4l2capture) ==
GST_V4L2_FLOW_RESOLUTION_CHANGE || self->draining)
gst_v4l2_object_stop (self->v4l2capture);
return TRUE;
}
static gboolean
gst_v4l2_video_remove_padding (GstCapsFeatures * features,
GstStructure * structure, gpointer user_data)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (user_data);
GstVideoAlignment *align = &self->v4l2capture->align;
GstVideoInfo *info = &self->v4l2capture->info;
int width, height;
if (!gst_structure_get_int (structure, "width", &width))
return TRUE;
if (!gst_structure_get_int (structure, "height", &height))
return TRUE;
if (align->padding_left != 0 || align->padding_top != 0 ||
height != info->height + align->padding_bottom)
return TRUE;
if (height == info->height + align->padding_bottom) {
/* Some drivers may round up width to the padded with */
if (width == info->width + align->padding_right)
gst_structure_set (structure,
"width", G_TYPE_INT, width - align->padding_right,
"height", G_TYPE_INT, height - align->padding_bottom, NULL);
/* Some drivers may keep visible width and only round up bytesperline */
else if (width == info->width)
gst_structure_set (structure,
"height", G_TYPE_INT, height - align->padding_bottom, NULL);
}
return TRUE;
}
static gboolean
gst_v4l2_video_dec_negotiate (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GstV4l2Error error = GST_V4L2_ERROR_INIT;
GstVideoInfo info;
GstVideoCodecState *output_state;
GstCaps *acquired_caps, *fixation_caps, *available_caps, *caps, *filter;
GstStructure *st;
gboolean active;
GstBufferPool *cpool;
gboolean ret;
/* We don't allow renegotiation without careful disabling the pool */
cpool = gst_v4l2_object_get_buffer_pool (self->v4l2capture);
if (cpool) {
gboolean is_active = gst_buffer_pool_is_active (cpool);
gst_object_unref (cpool);
if (is_active)
return TRUE;
}
/* init capture fps according to output */
self->v4l2capture->info.fps_d = self->v4l2output->info.fps_d;
self->v4l2capture->info.fps_n = self->v4l2output->info.fps_n;
/* For decoders G_FMT returns coded size, G_SELECTION returns visible size
* in the compose rectangle. gst_v4l2_object_acquire_format() checks both
* and returns the visible size as with/height and the coded size as
* padding. */
if (!gst_v4l2_object_acquire_format (self->v4l2capture, &info))
goto not_negotiated;
/* gst_v4l2_object_acquire_format() does not set fps, copy from sink */
info.fps_n = self->v4l2output->info.fps_n;
info.fps_d = self->v4l2output->info.fps_d;
gst_caps_replace (&self->probed_srccaps, NULL);
self->probed_srccaps = gst_v4l2_object_probe_caps (self->v4l2capture,
gst_v4l2_object_get_raw_caps ());
/* Create caps from the acquired format, remove the format field */
acquired_caps = gst_video_info_to_caps (&info);
GST_DEBUG_OBJECT (self, "Acquired caps: %" GST_PTR_FORMAT, acquired_caps);
fixation_caps = gst_caps_copy (acquired_caps);
st = gst_caps_get_structure (fixation_caps, 0);
gst_structure_remove_fields (st, "format", "colorimetry", "chroma-site",
NULL);
/* Probe currently available pixel formats */
available_caps = gst_caps_copy (self->probed_srccaps);
GST_DEBUG_OBJECT (self, "Available caps: %" GST_PTR_FORMAT, available_caps);
/* Replace coded size with visible size, we want to negotiate visible size
* with downstream, not coded size. */
gst_caps_map_in_place (available_caps, gst_v4l2_video_remove_padding, self);
filter = gst_caps_intersect_full (available_caps, fixation_caps,
GST_CAPS_INTERSECT_FIRST);
GST_DEBUG_OBJECT (self, "Filtered caps: %" GST_PTR_FORMAT, filter);
gst_caps_unref (fixation_caps);
gst_caps_unref (available_caps);
caps = gst_pad_peer_query_caps (decoder->srcpad, filter);
gst_caps_unref (filter);
GST_DEBUG_OBJECT (self, "Possible decoded caps: %" GST_PTR_FORMAT, caps);
if (gst_caps_is_empty (caps)) {
gst_caps_unref (caps);
goto not_negotiated;
}
/* Prefer the acquired caps over anything suggested downstream, this ensure
* that we preserves the bit depth, as we don't have any fancy fixation
* process */
if (gst_caps_is_subset (acquired_caps, caps))
goto use_acquired_caps;
/* Fixate pixel format */
caps = gst_caps_fixate (caps);
GST_DEBUG_OBJECT (self, "Chosen decoded caps: %" GST_PTR_FORMAT, caps);
/* Try to set negotiated format, on success replace acquired format */
if (gst_v4l2_object_set_format (self->v4l2capture, caps, &error))
gst_video_info_from_caps (&info, caps);
else
gst_v4l2_clear_error (&error);
use_acquired_caps:
gst_caps_unref (acquired_caps);
gst_caps_unref (caps);
/* catch possible bogus driver that don't enumerate the format it actually
* returned from G_FMT */
if (!self->v4l2capture->fmtdesc)
goto not_negotiated;
output_state = gst_video_decoder_set_output_state (decoder,
info.finfo->format, info.width, info.height, self->input_state);
/* Copy the rest of the information, there might be more in the future */
output_state->info.interlace_mode = info.interlace_mode;
output_state->info.colorimetry = info.colorimetry;
gst_video_codec_state_unref (output_state);
ret = GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder);
if (!ret)
goto not_negotiated;
/* The pool may be created through gst_video_decoder_negotiate(), so must
* be kept after */
cpool = gst_v4l2_object_get_buffer_pool (self->v4l2capture);
gst_v4l2_buffer_pool_enable_resolution_change (GST_V4L2_BUFFER_POOL (cpool));
/* Ensure our internal pool is activated */
active = gst_buffer_pool_set_active (cpool, TRUE);
if (cpool)
gst_object_unref (cpool);
if (!active)
goto activate_failed;
return TRUE;
not_negotiated:
GST_ERROR_OBJECT (self, "not negotiated");
gst_v4l2_error (self, &error);
gst_v4l2_object_stop (self->v4l2capture);
return FALSE;
activate_failed:
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
(_("Failed to allocate required memory.")),
("Buffer pool activation failed"));
gst_v4l2_object_stop (self->v4l2capture);
return FALSE;
}
static gboolean
gst_v4l2_decoder_cmd (GstV4l2Object * v4l2object, guint cmd, guint flags)
{
struct v4l2_decoder_cmd dcmd = { 0, };
GST_DEBUG_OBJECT (v4l2object->element,
"sending v4l2 decoder command %u with flags %u", cmd, flags);
if (!GST_V4L2_IS_OPEN (v4l2object))
return FALSE;
dcmd.cmd = cmd;
dcmd.flags = flags;
if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_DECODER_CMD, &dcmd) < 0)
goto dcmd_failed;
return TRUE;
dcmd_failed:
if (errno == ENOTTY) {
GST_INFO_OBJECT (v4l2object->element,
"Failed to send decoder command %u with flags %u for '%s'. (%s)",
cmd, flags, v4l2object->videodev, g_strerror (errno));
} else {
GST_ERROR_OBJECT (v4l2object->element,
"Failed to send decoder command %u with flags %u for '%s'. (%s)",
cmd, flags, v4l2object->videodev, g_strerror (errno));
}
return FALSE;
}
static GstFlowReturn
gst_v4l2_video_dec_finish (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *buffer;
GList *pending_frames = NULL;
if (gst_pad_get_task_state (decoder->srcpad) != GST_TASK_STARTED)
goto done;
GST_DEBUG_OBJECT (self, "Finishing decoding");
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
/* If we are in the middle of a source change, cancel it */
self->draining = FALSE;
if (gst_v4l2_decoder_cmd (self->v4l2output, V4L2_DEC_CMD_STOP, 0)) {
GstTask *task;
GST_OBJECT_LOCK (decoder->srcpad);
task = GST_PAD_TASK (decoder->srcpad);
if (task)
gst_object_ref (task);
GST_OBJECT_UNLOCK (decoder->srcpad);
if (task) {
/* If the decoder stop command succeeded, just wait until processing is
* finished */
GST_DEBUG_OBJECT (self, "Waiting for decoder stop");
GST_OBJECT_LOCK (task);
while (GST_TASK_STATE (task) == GST_TASK_STARTED)
GST_TASK_WAIT (task);
GST_OBJECT_UNLOCK (task);
ret = GST_FLOW_FLUSHING;
gst_object_unref (task);
}
} else {
GstBufferPool *opool = gst_v4l2_object_get_buffer_pool (self->v4l2output);
/* otherwise keep queuing empty buffers until the processing thread has
* stopped, _pool_process() will return FLUSHING when that happened */
while (ret == GST_FLOW_OK) {
buffer = gst_buffer_new ();
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (opool), &buffer,
NULL);
gst_buffer_unref (buffer);
}
if (opool)
gst_object_unref (opool);
}
/* and ensure the processing thread has stopped in case another error
* occurred. */
gst_v4l2_object_unlock (self->v4l2capture);
gst_pad_stop_task (decoder->srcpad);
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
if (ret == GST_FLOW_FLUSHING)
ret = self->output_flow;
GST_DEBUG_OBJECT (decoder, "Done draining buffers");
/* Draining of the capture buffer has completed.
* If any pending frames remain at this point there is a decoder error.
* This has been observed as a driver bug, where eos is sent too early.
* These frames will never be rendered, so drop them now with a warning */
pending_frames = gst_video_decoder_get_frames (decoder);
if (pending_frames) {
int counter = 0;
guint32 first = 0, last = 0;
for (GList * g = pending_frames; g; g = g->next) {
GstVideoCodecFrame *frame = g->data;
g->data = NULL;
last = frame->system_frame_number;
if (!counter)
first = last;
counter++;
gst_video_decoder_drop_frame (decoder, frame);
}
if (self->output_flow == GST_FLOW_OK) {
g_warning ("%s: %i frames %u-%u left undrained after CMD_STOP, "
"eos sent too early: bug in decoder -- please file a bug",
GST_ELEMENT_NAME (decoder), counter, first, last);
}
if (pending_frames)
g_list_free (pending_frames);
}
done:
return ret;
}
static GstFlowReturn
gst_v4l2_video_dec_drain (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GST_DEBUG_OBJECT (self, "Draining...");
gst_v4l2_video_dec_finish (decoder);
gst_v4l2_video_dec_flush (decoder);
return GST_FLOW_OK;
}
static gboolean
check_system_frame_number_too_old (guint32 current, guint32 old)
{
guint32 absdiff = current > old ? current - old : old - current;
/* More than 100 frames in the past, or current wrapped around */
if (absdiff > 100) {
/* Wraparound and difference is actually smaller than 100 */
if (absdiff > G_MAXUINT32 - 100)
return FALSE;
return TRUE;
}
return FALSE;
}
/* Only used initially to wait for a SRC_CH event
* called with decoder stream lock */
static GstFlowReturn
gst_v4l2_video_dec_wait_for_src_ch (GstV4l2VideoDec * self)
{
GstFlowReturn flowret;
if (!self->wait_for_source_change)
return GST_FLOW_OK;
GST_DEBUG_OBJECT (self, "Waiting for source change event");
GST_VIDEO_DECODER_STREAM_UNLOCK (GST_VIDEO_DECODER (self));
flowret = gst_v4l2_object_poll (self->v4l2capture, GST_CLOCK_TIME_NONE);
GST_VIDEO_DECODER_STREAM_LOCK (GST_VIDEO_DECODER (self));
/* Fix the flow return value, as the poll is watching for buffer, but we are
* looking for the source change event */
if (flowret == GST_V4L2_FLOW_RESOLUTION_CHANGE) {
self->wait_for_source_change = FALSE;
flowret = GST_FLOW_OK;
} else if (flowret == GST_FLOW_OK) {
/* A buffer would be unexpected, in this case just terminate */
flowret = GST_V4L2_FLOW_LAST_BUFFER;
}
return flowret;
}
static void
gst_v4l2_video_dec_loop (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GstBufferPool *pool;
GstVideoCodecFrame *frame;
GstBuffer *buffer = NULL;
GstFlowReturn ret;
GST_LOG_OBJECT (self, "Looping.");
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) {
ret = gst_v4l2_video_dec_wait_for_src_ch (self);
if (ret != GST_FLOW_OK) {
GST_INFO_OBJECT (decoder, "Polling for source change was interrupted");
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
goto beach;
}
GST_DEBUG_OBJECT (decoder, "Setup the capture queue");
if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) {
if (!gst_video_decoder_negotiate (decoder)) {
/* FIXME not super nice ? */
if (GST_PAD_IS_FLUSHING (decoder->sinkpad)
|| GST_PAD_IS_FLUSHING (decoder->srcpad)) {
ret = GST_FLOW_FLUSHING;
} else {
ret = GST_FLOW_NOT_NEGOTIATED;
GST_ERROR_OBJECT (decoder, "Failed to setup capture queue");
}
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
goto beach;
}
/*
* In case we are flushing or stopping the element, ensure the active
* state is reflected onto the newly create pool.
*/
if (!g_atomic_int_get (&self->active))
gst_v4l2_object_unlock (self->v4l2capture);
}
/* just a safety, as introducing mistakes in negotiation seems rather
* easy.*/
g_return_if_fail (GST_V4L2_IS_ACTIVE (self->v4l2capture));
}
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
GST_LOG_OBJECT (decoder, "Acquire output buffer");
self->output_flow = GST_FLOW_OK;
do {
/* We cannot use the base class allotate helper since it taking the internal
* stream lock. we know that the acquire may need to poll until more frames
* comes in and holding this lock would prevent that.
*/
pool = gst_video_decoder_get_buffer_pool (decoder);
/* Pool may be NULL if we started going to READY state */
if (pool == NULL) {
ret = GST_FLOW_FLUSHING;
goto beach;
}
ret = gst_buffer_pool_acquire_buffer (pool, &buffer, NULL);
g_object_unref (pool);
if (ret != GST_FLOW_OK)
goto beach;
GST_LOG_OBJECT (decoder, "Process output buffer");
{
GstV4l2BufferPool *cpool =
GST_V4L2_BUFFER_POOL (gst_v4l2_object_get_buffer_pool
(self->v4l2capture));
ret = gst_v4l2_buffer_pool_process (cpool, &buffer, NULL);
if (cpool)
gst_object_unref (cpool);
}
} while (ret == GST_V4L2_FLOW_CORRUPTED_BUFFER);
if (ret != GST_FLOW_OK)
goto beach;
if (GST_BUFFER_TIMESTAMP (buffer) % GST_SECOND != 0)
GST_ERROR_OBJECT (decoder,
"Driver bug detected - check driver with v4l2-compliance from http://git.linuxtv.org/v4l-utils.git");
GST_LOG_OBJECT (decoder, "Got buffer for frame number %u",
(guint32) (GST_BUFFER_TIMESTAMP (buffer) / GST_SECOND));
frame =
gst_video_decoder_get_frame (decoder,
GST_BUFFER_TIMESTAMP (buffer) / GST_SECOND);
if (frame) {
GstVideoCodecFrame *oldest_frame;
gboolean warned = FALSE;
/* Garbage collect old frames in case of codec bugs */
while ((oldest_frame = gst_video_decoder_get_oldest_frame (decoder)) &&
check_system_frame_number_too_old (frame->system_frame_number,
oldest_frame->system_frame_number)) {
if (oldest_frame->system_frame_number > 0) {
gst_video_decoder_drop_frame (decoder, oldest_frame);
oldest_frame = NULL;
if (!warned) {
g_warning ("%s: Too old frames, bug in decoder -- please file a bug",
GST_ELEMENT_NAME (decoder));
warned = TRUE;
}
} else {
/* special treatment when oldest_frame->system_frame_number = 0:
* if a consecutive sequence 0, 1, 2,..., n < frame->system_frame_number
* is pending, drop them all at this time. (This has been seen to occur
* as a driver bug when the initial frame triggered a Caps re-negotiation,
* and the driver dropped these frames) */
guint32 counter = 0;
while (oldest_frame) {
gst_video_decoder_drop_frame (decoder, oldest_frame);
counter++;
oldest_frame = gst_video_decoder_get_oldest_frame (decoder);
if (oldest_frame &&
(oldest_frame->system_frame_number > counter ||
oldest_frame->system_frame_number >=
frame->system_frame_number)) {
gst_video_codec_frame_unref (oldest_frame);
oldest_frame = NULL;
}
}
g_warning
("%s: %i initial frames were not dequeued: bug in decoder -- please file a bug",
GST_ELEMENT_NAME (decoder), counter);
}
}
if (oldest_frame)
gst_video_codec_frame_unref (oldest_frame);
frame->duration = self->v4l2capture->duration;
frame->output_buffer = buffer;
buffer = NULL;
ret = gst_video_decoder_finish_frame (decoder, frame);
if (ret != GST_FLOW_OK)
goto beach;
} else {
GST_WARNING_OBJECT (decoder, "Decoder is producing too many buffers");
gst_buffer_unref (buffer);
}
return;
beach:
if (ret == GST_V4L2_FLOW_RESOLUTION_CHANGE) {
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
self->draining = TRUE;
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
GST_INFO_OBJECT (decoder, "Received resolution change");
return;
}
if (ret == GST_V4L2_FLOW_LAST_BUFFER) {
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
if (self->draining) {
self->draining = FALSE;
gst_v4l2_object_stop (self->v4l2capture);
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
return;
}
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
}
GST_DEBUG_OBJECT (decoder, "Leaving output thread: %s",
gst_flow_get_name (ret));
gst_buffer_replace (&buffer, NULL);
self->output_flow = ret;
gst_v4l2_object_unlock (self->v4l2output);
gst_pad_pause_task (decoder->srcpad);
}
static GstFlowReturn
gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
GstVideoCodecFrame * frame)
{
GstV4l2Error error = GST_V4L2_ERROR_INIT;
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GstBufferPool *pool = NULL;
GstFlowReturn ret = GST_FLOW_OK;
gboolean processed = FALSE;
GstBuffer *tmp;
GstTaskState task_state;
GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
goto flushing;
if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2output))) {
if (!self->input_state)
goto not_negotiated;
if (!gst_v4l2_object_set_format (self->v4l2output, self->input_state->caps,
&error))
goto not_negotiated;
}
pool = gst_v4l2_object_get_buffer_pool (self->v4l2output);
if (G_UNLIKELY (!gst_buffer_pool_is_active (pool))) {
GstBuffer *codec_data;
GstStructure *config = gst_buffer_pool_get_config (pool);
guint min = MAX (self->v4l2output->min_buffers,
GST_V4L2_MIN_BUFFERS (self->v4l2output));
guint max = VIDEO_MAX_FRAME;
guint32 dummy_frame_number = 0;
GST_DEBUG_OBJECT (self, "Sending header");
codec_data = self->input_state->codec_data;
/* We are running in byte-stream mode, so we don't know the headers, but
* we need to send something, otherwise the decoder will refuse to
* initialize.
*/
if (codec_data) {
gst_buffer_ref (codec_data);
} else {
codec_data = gst_buffer_ref (frame->input_buffer);
processed = TRUE;
}
/* Ensure input internal pool is active */
gst_buffer_pool_config_set_params (config, self->input_state->caps,
self->v4l2output->info.size, min, max);
/* There is no reason to refuse this config */
if (!gst_buffer_pool_set_config (pool, config)) {
config = gst_buffer_pool_get_config (pool);
if (!gst_buffer_pool_config_validate_params (config,
self->input_state->caps, self->v4l2output->info.size, min, max)) {
gst_structure_free (config);
goto activate_failed;
}
if (!gst_buffer_pool_set_config (pool, config))
goto activate_failed;
}
/* Ensure to unlock capture, as it may be flushing due to previous
* unlock/stop calls */
gst_v4l2_object_unlock_stop (self->v4l2output);
gst_v4l2_object_unlock_stop (self->v4l2capture);
if (!gst_buffer_pool_set_active (pool, TRUE))
goto activate_failed;
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
GST_LOG_OBJECT (decoder, "Passing buffer with system frame number %u",
processed ? frame->system_frame_number : 0);
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (pool), &codec_data,
processed ? &frame->system_frame_number : &dummy_frame_number);
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
gst_buffer_unref (codec_data);
/* Only wait for source change if the formats supports it */
if (!GST_V4L2_IS_ACTIVE (self->v4l2capture) &&
self->v4l2output->fmtdesc->flags & V4L2_FMT_FLAG_DYN_RESOLUTION) {
gst_v4l2_object_unlock_stop (self->v4l2capture);
self->wait_for_source_change = TRUE;
}
}
task_state = gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (self));
if (task_state == GST_TASK_STOPPED || task_state == GST_TASK_PAUSED) {
/* It's possible that the processing thread stopped due to an error */
if (self->output_flow != GST_FLOW_OK &&
self->output_flow != GST_FLOW_FLUSHING) {
GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
ret = self->output_flow;
goto drop;
}
GST_DEBUG_OBJECT (self, "Starting decoding thread");
/* Start the processing task, when it quits, the task will disable input
* processing to unlock input if draining, or prevent potential block */
self->output_flow = GST_FLOW_FLUSHING;
self->draining = FALSE;
if (!gst_pad_start_task (decoder->srcpad,
(GstTaskFunction) gst_v4l2_video_dec_loop, self, NULL))
goto start_task_failed;
}
if (!processed) {
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
GST_LOG_OBJECT (decoder, "Passing buffer with system frame number %u",
frame->system_frame_number);
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (pool),
&frame->input_buffer, &frame->system_frame_number);
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
if (ret == GST_FLOW_FLUSHING) {
if (gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (self)) !=
GST_TASK_STARTED)
ret = self->output_flow;
goto drop;
} else if (ret != GST_FLOW_OK) {
goto process_failed;
}
}
/* No need to keep input around */
tmp = frame->input_buffer;
frame->input_buffer = gst_buffer_new ();
gst_buffer_copy_into (frame->input_buffer, tmp,
GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS |
GST_BUFFER_COPY_META, 0, 0);
gst_buffer_unref (tmp);
gst_video_codec_frame_unref (frame);
if (pool)
gst_object_unref (pool);
return ret;
/* ERRORS */
not_negotiated:
{
GST_ERROR_OBJECT (self, "not negotiated");
ret = GST_FLOW_NOT_NEGOTIATED;
gst_v4l2_error (self, &error);
goto drop;
}
activate_failed:
{
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
(_("Failed to allocate required memory.")),
("Buffer pool activation failed"));
ret = GST_FLOW_ERROR;
goto drop;
}
flushing:
{
ret = GST_FLOW_FLUSHING;
goto drop;
}
start_task_failed:
{
GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
(_("Failed to start decoding thread.")), (NULL));
ret = GST_FLOW_ERROR;
goto drop;
}
process_failed:
{
GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
(_("Failed to process frame.")),
("Maybe be due to not enough memory or failing driver"));
ret = GST_FLOW_ERROR;
goto drop;
}
drop:
{
if (pool)
gst_object_unref (pool);
gst_video_decoder_drop_frame (decoder, frame);
return ret;
}
}
static gboolean
gst_v4l2_video_dec_decide_allocation (GstVideoDecoder * decoder,
GstQuery * query)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GstClockTime latency;
gboolean ret = FALSE;
if (gst_v4l2_object_decide_allocation (self->v4l2capture, query))
ret = GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder,
query);
if (GST_CLOCK_TIME_IS_VALID (self->v4l2capture->duration)) {
latency = self->v4l2capture->min_buffers * self->v4l2capture->duration;
GST_DEBUG_OBJECT (self, "Setting latency: %" GST_TIME_FORMAT " (%"
G_GUINT32_FORMAT " * %" G_GUINT64_FORMAT, GST_TIME_ARGS (latency),
self->v4l2capture->min_buffers, self->v4l2capture->duration);
gst_video_decoder_set_latency (decoder, latency, latency);
} else {
GST_WARNING_OBJECT (self, "Duration invalid, not setting latency");
}
return ret;
}
static gboolean
gst_v4l2_video_dec_src_query (GstVideoDecoder * decoder, GstQuery * query)
{
gboolean ret = TRUE;
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:{
GstCaps *filter, *result = NULL;
GstPad *pad = GST_VIDEO_DECODER_SRC_PAD (decoder);
gst_query_parse_caps (query, &filter);
if (self->probed_srccaps)
result = gst_caps_ref (self->probed_srccaps);
else
result = gst_pad_get_pad_template_caps (pad);
if (filter) {
GstCaps *tmp = result;
result =
gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (tmp);
}
GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
gst_query_set_caps_result (query, result);
gst_caps_unref (result);
break;
}
default:
ret = GST_VIDEO_DECODER_CLASS (parent_class)->src_query (decoder, query);
break;
}
return ret;
}
static GstCaps *
gst_v4l2_video_dec_sink_getcaps (GstVideoDecoder * decoder, GstCaps * filter)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GstCaps *result;
result = gst_video_decoder_proxy_getcaps (decoder, self->probed_sinkcaps,
filter);
GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
return result;
}
static gboolean
gst_v4l2_video_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
gboolean ret;
GstEventType type = GST_EVENT_TYPE (event);
switch (type) {
case GST_EVENT_FLUSH_START:
GST_DEBUG_OBJECT (self, "flush start");
gst_v4l2_object_unlock (self->v4l2output);
gst_v4l2_object_unlock (self->v4l2capture);
break;
default:
break;
}
ret = GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
switch (type) {
case GST_EVENT_FLUSH_START:
/* The processing thread should stop now, wait for it */
gst_pad_stop_task (decoder->srcpad);
GST_DEBUG_OBJECT (self, "flush start done");
break;
default:
break;
}
return ret;
}
static GstStateChangeReturn
gst_v4l2_video_dec_change_state (GstElement * element,
GstStateChange transition)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (element);
GstVideoDecoder *decoder = GST_VIDEO_DECODER (element);
if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
g_atomic_int_set (&self->active, FALSE);
gst_v4l2_object_unlock (self->v4l2output);
gst_v4l2_object_unlock (self->v4l2capture);
gst_pad_stop_task (decoder->srcpad);
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
}
static void
gst_v4l2_video_dec_dispose (GObject * object)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
gst_caps_replace (&self->probed_sinkcaps, NULL);
gst_caps_replace (&self->probed_srccaps, NULL);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_v4l2_video_dec_finalize (GObject * object)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
gst_v4l2_object_destroy (self->v4l2capture);
gst_v4l2_object_destroy (self->v4l2output);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_v4l2_video_dec_init (GstV4l2VideoDec * self)
{
/* V4L2 object are created in subinstance_init */
}
static void
gst_v4l2_video_dec_subinstance_init (GTypeInstance * instance, gpointer g_class)
{
GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (instance);
GstVideoDecoder *decoder = GST_VIDEO_DECODER (instance);
gst_video_decoder_set_packetized (decoder, TRUE);
self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
GST_OBJECT (GST_VIDEO_DECODER_SINK_PAD (self)),
V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
gst_v4l2_get_output, gst_v4l2_set_output, NULL);
self->v4l2output->no_initial_format = TRUE;
self->v4l2output->keep_aspect = FALSE;
self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
GST_OBJECT (GST_VIDEO_DECODER_SRC_PAD (self)),
V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
gst_v4l2_get_input, gst_v4l2_set_input, NULL);
}
static void
gst_v4l2_video_dec_class_init (GstV4l2VideoDecClass * klass)
{
GstElementClass *element_class;
GObjectClass *gobject_class;
GstVideoDecoderClass *video_decoder_class;
parent_class = g_type_class_peek_parent (klass);
element_class = (GstElementClass *) klass;
gobject_class = (GObjectClass *) klass;
video_decoder_class = (GstVideoDecoderClass *) klass;
GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_dec_debug, "v4l2videodec", 0,
"V4L2 Video Decoder");
gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_dispose);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finalize);
gobject_class->set_property =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_property);
gobject_class->get_property =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_get_property);
video_decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_open);
video_decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_close);
video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_start);
video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_stop);
video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finish);
video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_flush);
video_decoder_class->drain = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_drain);
video_decoder_class->set_format =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_format);
video_decoder_class->negotiate =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_negotiate);
video_decoder_class->decide_allocation =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_decide_allocation);
/* FIXME propose_allocation or not ? */
video_decoder_class->handle_frame =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_handle_frame);
video_decoder_class->getcaps =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_getcaps);
video_decoder_class->src_query =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_src_query);
video_decoder_class->sink_event =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_event);
element_class->change_state =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_change_state);
gst_v4l2_object_install_m2m_properties_helper (gobject_class);
}
static void
gst_v4l2_video_dec_subclass_init (gpointer g_class, gpointer data)
{
GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
GstV4l2VideoDecCData *cdata = data;
klass->default_device = cdata->device;
gst_element_class_add_pad_template (element_class,
gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
cdata->sink_caps));
gst_element_class_add_pad_template (element_class,
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
cdata->src_caps));
gst_element_class_set_metadata (element_class, cdata->longname,
"Codec/Decoder/Video/Hardware", cdata->description,
"Nicolas Dufresne <nicolas.dufresne@collabora.com>");
gst_caps_unref (cdata->sink_caps);
gst_caps_unref (cdata->src_caps);
g_free (cdata);
}
/* Probing functions */
gboolean
gst_v4l2_is_video_dec (GstCaps * sink_caps, GstCaps * src_caps)
{
gboolean ret = FALSE;
if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_codec_caps ())
&& gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ()))
ret = TRUE;
return ret;
}
static gchar *
gst_v4l2_video_dec_set_metadata (GstStructure * s, GstV4l2VideoDecCData * cdata,
const gchar * basename)
{
gchar *codec_name = NULL;
gchar *type_name = NULL;
#define SET_META(codec) \
G_STMT_START { \
cdata->longname = "V4L2 " codec " Decoder"; \
cdata->description = "Decodes " codec " streams via V4L2 API"; \
codec_name = g_ascii_strdown (codec, -1); \
} G_STMT_END
if (gst_structure_has_name (s, "image/jpeg")) {
SET_META ("JPEG");
} else if (gst_structure_has_name (s, "video/mpeg")) {
gint mpegversion = 0;
gst_structure_get_int (s, "mpegversion", &mpegversion);
if (mpegversion == 4) {
SET_META ("MPEG4");
cdata->codec = gst_v4l2_mpeg4_get_codec ();
} else {
/* MPEG 2 decoders supports MPEG 1 format */
SET_META ("MPEG2");
cdata->codec = gst_v4l2_mpeg2_get_codec ();
}
} else if (gst_structure_has_name (s, "video/x-h263")) {
SET_META ("H263");
} else if (gst_structure_has_name (s, "video/x-fwht")) {
SET_META ("FWHT");
} else if (gst_structure_has_name (s, "video/x-h264")) {
SET_META ("H264");
cdata->codec = gst_v4l2_h264_get_codec ();
} else if (gst_structure_has_name (s, "video/x-h265")) {
SET_META ("H265");
cdata->codec = gst_v4l2_h265_get_codec ();
} else if (gst_structure_has_name (s, "video/x-wmv")) {
SET_META ("VC1");
} else if (gst_structure_has_name (s, "video/x-vp8")) {
SET_META ("VP8");
cdata->codec = gst_v4l2_vp8_get_codec ();
} else if (gst_structure_has_name (s, "video/x-vp9")) {
SET_META ("VP9");
cdata->codec = gst_v4l2_vp9_get_codec ();
} else if (gst_structure_has_name (s, "video/x-bayer")) {
SET_META ("BAYER");
} else if (gst_structure_has_name (s, "video/x-sonix")) {
SET_META ("SONIX");
} else if (gst_structure_has_name (s, "video/x-pwc1")) {
SET_META ("PWC1");
} else if (gst_structure_has_name (s, "video/x-pwc2")) {
SET_META ("PWC2");
} else {
/* This code should be kept on sync with the exposed CODEC type of format
* from gstv4l2object.c. This warning will only occur in case we forget
* to also add a format here. */
gchar *s_str = gst_structure_to_string (s);
g_warning ("Missing fixed name mapping for caps '%s', this is a GStreamer "
"bug, please report at https://bugs.gnome.org", s_str);
g_free (s_str);
}
if (codec_name) {
type_name = g_strdup_printf ("v4l2%sdec", codec_name);
if (g_type_from_name (type_name) != 0) {
g_free (type_name);
type_name = g_strdup_printf ("v4l2%s%sdec", basename, codec_name);
}
g_free (codec_name);
}
return type_name;
#undef SET_META
}
void
gst_v4l2_video_dec_register (GstPlugin * plugin, const gchar * basename,
const gchar * device_path, gint video_fd, GstCaps * sink_caps,
GstCaps * src_caps)
{
gint i;
for (i = 0; i < gst_caps_get_size (sink_caps); i++) {
GstV4l2VideoDecCData *cdata;
GstStructure *s;
GTypeQuery type_query;
GTypeInfo type_info = { 0, };
GType type, subtype;
gchar *type_name;
s = gst_caps_get_structure (sink_caps, i);
cdata = g_new0 (GstV4l2VideoDecCData, 1);
cdata->device = g_strdup (device_path);
cdata->sink_caps = gst_caps_new_empty ();
gst_caps_append_structure (cdata->sink_caps, gst_structure_copy (s));
GST_MINI_OBJECT_FLAG_SET (cdata->sink_caps,
GST_MINI_OBJECT_FLAG_MAY_BE_LEAKED);
cdata->src_caps = gst_caps_ref (src_caps);
type_name = gst_v4l2_video_dec_set_metadata (s, cdata, basename);
/* Skip over if we hit an unmapped type */
if (!type_name) {
g_free (cdata->device);
gst_caps_unref (cdata->sink_caps);
gst_caps_unref (cdata->src_caps);
g_free (cdata);
continue;
}
if (cdata->codec != NULL && cdata->codec != gst_v4l2_vp8_get_codec ()
&& cdata->codec != gst_v4l2_vp9_get_codec ()) {
GValue value = G_VALUE_INIT;
if (gst_v4l2_codec_probe_levels (cdata->codec, video_fd, &value)) {
gst_caps_set_value (cdata->sink_caps, "level", &value);
g_value_unset (&value);
}
if (gst_v4l2_codec_probe_profiles (cdata->codec, video_fd, &value)) {
gst_caps_set_value (cdata->sink_caps, "profile", &value);
g_value_unset (&value);
}
}
type = gst_v4l2_video_dec_get_type ();
g_type_query (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 = gst_v4l2_video_dec_subclass_init;
type_info.class_data = cdata;
type_info.instance_init = gst_v4l2_video_dec_subinstance_init;
subtype = g_type_register_static (type, type_name, &type_info, 0);
if (!gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1,
subtype))
GST_WARNING ("Failed to register plugin '%s'", type_name);
g_free (type_name);
}
}
Reference in a new issue View git blame Copy permalink