gstreamer/sys/v4l2/gstv4l2videodec.c

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/*
* Copyright (C) 2014 Collabora Ltd.
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
*
* 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 "gstv4l2videodec.h"
#include "v4l2_calls.h"
#include <string.h>
#include <gst/gst-i18n-plugin.h>
#define DEFAULT_PROP_DEVICE "/dev/video0"
#define V4L2_VIDEO_DEC_QUARK \
g_quark_from_static_string("gst-v4l2-video-dec-info")
GST_DEBUG_CATEGORY_STATIC (gst_v4l2_video_dec_debug);
#define GST_CAT_DEFAULT gst_v4l2_video_dec_debug
static gboolean gst_v4l2_video_dec_flush (GstVideoDecoder * decoder);
typedef struct
{
gchar *device;
GstCaps *sink_caps;
GstCaps *src_caps;
} Gstv4l2VideoDecQData;
enum
{
PROP_0,
V4L2_STD_OBJECT_PROPS,
PROP_CAPTURE_IO_MODE,
};
static void gst_v4l2_video_dec_class_init (GstV4l2VideoDecClass * klass);
static void gst_v4l2_video_dec_init (GstV4l2VideoDec * self, gpointer g_class);
static void gst_v4l2_video_dec_base_init (gpointer g_class);
static GstVideoDecoderClass *parent_class = NULL;
GType
gst_v4l2_video_dec_get_type (void)
{
static volatile gsize type = 0;
if (g_once_init_enter (&type)) {
GType _type;
static const GTypeInfo info = {
sizeof (GstV4l2VideoDecClass),
gst_v4l2_video_dec_base_init,
NULL,
(GClassInitFunc) gst_v4l2_video_dec_class_init,
NULL,
NULL,
sizeof (GstV4l2VideoDec),
0,
(GInstanceInitFunc) gst_v4l2_video_dec_init,
NULL
};
_type = g_type_register_static (GST_TYPE_VIDEO_DECODER, "GstV4l2VideoDec",
&info, 0);
g_once_init_leave (&type, _type);
}
return type;
}
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) {
/* Split IO mode so output is configure through 'io-mode' and capture
* through 'capture-io-mode' */
case PROP_IO_MODE:
gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value,
pspec);
break;
case PROP_CAPTURE_IO_MODE:
gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value,
pspec);
break;
case PROP_DEVICE:
gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value,
pspec);
gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value,
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_IO_MODE:
gst_v4l2_object_get_property_helper (self->v4l2output, prop_id, value,
pspec);
break;
case PROP_CAPTURE_IO_MODE:
gst_v4l2_object_get_property_helper (self->v4l2output, PROP_IO_MODE,
value, 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);
GST_DEBUG_OBJECT (self, "Opening");
if (!gst_v4l2_object_open (self->v4l2output))
goto failure;
if (!gst_v4l2_object_open_shared (self->v4l2capture, self->v4l2output))
goto failure;
self->probed_sinkcaps = gst_v4l2_object_get_caps (self->v4l2output,
gst_v4l2_object_get_codec_caps ());
if (gst_caps_is_empty (self->probed_sinkcaps))
goto no_encoded_format;
self->probed_srccaps = gst_v4l2_object_get_caps (self->v4l2capture,
gst_v4l2_object_get_raw_caps ());
if (gst_caps_is_empty (self->probed_srccaps))
goto no_raw_format;
return TRUE;
no_encoded_format:
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
(_("Encoder on device %s has no supported input format"),
self->v4l2output->videodev), (NULL));
goto failure;
no_raw_format:
GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
(_("Encoder on device %s has no supported output 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);
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");
/* Should have been flushed already */
g_assert (g_atomic_int_get (&self->active) == FALSE);
g_assert (g_atomic_int_get (&self->processing) == 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
gst_v4l2_video_dec_set_format (GstVideoDecoder * decoder,
GstVideoCodecState * state)
{
gboolean ret = TRUE;
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GST_DEBUG_OBJECT (self, "Setting format: %" GST_PTR_FORMAT, state->caps);
if (self->input_state) {
if (gst_v4l2_object_caps_equal (self->v4l2output, state->caps)) {
GST_DEBUG_OBJECT (self, "Compatible caps");
goto done;
}
gst_video_codec_state_unref (self->input_state);
/* FIXME we probably need to do more work if pools are active */
}
ret = gst_v4l2_object_set_format (self->v4l2output, state->caps);
if (ret)
self->input_state = gst_video_codec_state_ref (state);
done:
return ret;
}
static gboolean
gst_v4l2_video_dec_flush (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GST_DEBUG_OBJECT (self, "Flushing");
/* Wait for capture thread to stop */
gst_pad_stop_task (decoder->srcpad);
self->output_flow = GST_FLOW_OK;
gst_v4l2_buffer_pool_flush (GST_V4L2_BUFFER_POOL (self->v4l2output->pool));
gst_v4l2_buffer_pool_flush (GST_V4L2_BUFFER_POOL (self->v4l2capture->pool));
/* Output will remain flushing until new frame comes in */
gst_v4l2_object_unlock_stop (self->v4l2capture);
return TRUE;
}
static gboolean
gst_v4l2_video_dec_negotiate (GstVideoDecoder * decoder)
{
return GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder);
}
static GstFlowReturn
gst_v4l2_video_dec_finish (GstVideoDecoder * decoder)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *buffer;
if (!self->input_state)
goto done;
GST_DEBUG_OBJECT (self, "Finishing decoding");
/* Keep queuing empty buffers until the processing thread has stopped,
* _pool_process() will return FLUSHING when that happened */
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
while (ret == GST_FLOW_OK) {
buffer = gst_buffer_new ();
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
v4l2output->pool), buffer);
gst_buffer_unref (buffer);
}
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
g_assert (g_atomic_int_get (&self->processing) == FALSE);
if (ret == GST_FLOW_FLUSHING)
ret = self->output_flow;
GST_DEBUG_OBJECT (decoder, "Done draining buffers");
done:
return ret;
}
static GstVideoCodecFrame *
gst_v4l2_video_dec_get_oldest_frame (GstVideoDecoder * decoder)
{
GstVideoCodecFrame *frame = NULL;
GList *frames, *l;
gint count = 0;
frames = gst_video_decoder_get_frames (decoder);
for (l = frames; l != NULL; l = l->next) {
GstVideoCodecFrame *f = l->data;
if (!frame || frame->pts > f->pts)
frame = f;
count++;
}
if (frame) {
GST_LOG_OBJECT (decoder,
"Oldest frame is %d %" GST_TIME_FORMAT " and %d frames left",
frame->system_frame_number, GST_TIME_ARGS (frame->pts), count - 1);
gst_video_codec_frame_ref (frame);
}
g_list_free_full (frames, (GDestroyNotify) gst_video_codec_frame_unref);
return frame;
}
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 (decoder, "Allocate output buffer");
/* 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);
ret = gst_buffer_pool_acquire_buffer (pool, &buffer, NULL);
g_object_unref (pool);
if (ret != GST_FLOW_OK)
goto beach;
/* Check if buffer isn't the last one */
if (gst_buffer_get_size (buffer) == 0)
goto beach;
GST_LOG_OBJECT (decoder, "Process output buffer");
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
v4l2capture->pool), buffer);
if (ret != GST_FLOW_OK)
goto beach;
frame = gst_v4l2_video_dec_get_oldest_frame (decoder);
if (frame) {
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:
GST_DEBUG_OBJECT (decoder, "Leaving output thread");
gst_buffer_replace (&buffer, NULL);
self->output_flow = ret;
g_atomic_int_set (&self->processing, FALSE);
gst_v4l2_object_unlock (self->v4l2output);
gst_pad_pause_task (decoder->srcpad);
}
static GstFlowReturn
gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
GstVideoCodecFrame * frame)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
GstFlowReturn ret = GST_FLOW_OK;
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 (!gst_v4l2_object_set_format (self->v4l2output, self->input_state->caps))
goto not_negotiated;
}
if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) {
GstVideoInfo info;
GstVideoCodecState *output_state;
GstBuffer *codec_data;
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
* intialize.
*/
if (codec_data) {
gst_buffer_ref (codec_data);
} else {
codec_data = frame->input_buffer;
frame->input_buffer = NULL;
}
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
gst_v4l2_object_unlock_stop (self->v4l2output);
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
v4l2output->pool), codec_data);
gst_v4l2_object_unlock (self->v4l2output);
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
gst_buffer_unref (codec_data);
if (!gst_v4l2_object_setup_format (self->v4l2capture, &info, &self->align))
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;
gst_video_codec_state_unref (output_state);
if (!gst_video_decoder_negotiate (decoder)) {
if (GST_PAD_IS_FLUSHING (decoder->srcpad))
goto flushing;
else
goto not_negotiated;
}
}
if (g_atomic_int_get (&self->processing) == FALSE) {
/* It possible that the processing thread stopped due to an error */
if (self->output_flow != GST_FLOW_OK) {
GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
ret = self->output_flow;
goto drop;
}
GST_DEBUG_OBJECT (self, "Starting decoding thread");
/* Enable processing input */
gst_v4l2_object_unlock_stop (self->v4l2output);
/* Start the processing task, when it quits, the task will disable input
* processing to unlock input if draining, or prevent potential block */
g_atomic_int_set (&self->processing, TRUE);
gst_pad_start_task (decoder->srcpad,
(GstTaskFunction) gst_v4l2_video_dec_loop, self, NULL);
}
if (frame->input_buffer) {
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->
pool), frame->input_buffer);
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
if (ret == GST_FLOW_FLUSHING) {
if (g_atomic_int_get (&self->processing) == FALSE)
ret = self->output_flow;
}
/* No need to keep input arround */
gst_buffer_replace (&frame->input_buffer, NULL);
}
gst_video_codec_frame_unref (frame);
return ret;
/* ERRORS */
not_negotiated:
{
GST_ERROR_OBJECT (self, "not negotiated");
ret = GST_FLOW_NOT_NEGOTIATED;
goto drop;
}
flushing:
{
ret = GST_FLOW_FLUSHING;
goto drop;
}
drop:
{
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);
latency = self->v4l2capture->min_buffers_for_capture *
self->v4l2capture->duration;
gst_video_decoder_set_latency (decoder, latency, 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;
gst_query_parse_caps (query, &filter);
if (self->probed_srccaps)
result = gst_caps_ref (self->probed_srccaps);
else
result = gst_v4l2_object_get_raw_caps ();
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 gboolean
gst_v4l2_video_dec_sink_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;
gst_query_parse_caps (query, &filter);
if (self->probed_sinkcaps)
result = gst_caps_ref (self->probed_sinkcaps);
else
result = gst_v4l2_object_get_codec_caps ();
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 sink 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)->sink_query (decoder, query);
break;
}
return ret;
}
static gboolean
gst_v4l2_video_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
gst_v4l2_object_unlock (self->v4l2output);
gst_v4l2_object_unlock (self->v4l2capture);
default:
break;
}
return GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
}
static GstStateChangeReturn
gst_v4l2_video_dec_change_state (GstElement * element,
GstStateChange transition)
{
GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (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);
}
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_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
Gstv4l2VideoDecQData *qdata;
GstPadTemplate *templ;
qdata = g_type_get_qdata (G_TYPE_FROM_CLASS (g_class), V4L2_VIDEO_DEC_QUARK);
if (!qdata)
return;
templ =
gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
qdata->sink_caps);
gst_element_class_add_pad_template (element_class, templ);
templ =
gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
qdata->src_caps);
gst_element_class_add_pad_template (element_class, templ);
}
static void
gst_v4l2_video_dec_init (GstV4l2VideoDec * self, gpointer g_class)
{
GstVideoDecoder *decoder = (GstVideoDecoder *) self;
Gstv4l2VideoDecQData *qdata;
qdata = g_type_get_qdata (G_TYPE_FROM_CLASS (g_class), V4L2_VIDEO_DEC_QUARK);
if (!qdata)
return;
gst_video_decoder_set_packetized (decoder, TRUE);
self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
V4L2_BUF_TYPE_VIDEO_OUTPUT, qdata->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),
V4L2_BUF_TYPE_VIDEO_CAPTURE, qdata->device,
gst_v4l2_get_input, gst_v4l2_set_input, NULL);
self->v4l2capture->no_initial_format = TRUE;
self->v4l2output->keep_aspect = FALSE;
g_object_set (self, "device", qdata->device, 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_element_class_set_static_metadata (element_class,
"V4L2 Video Decoder",
"Codec/Decoder/Video",
"Decode video streams via V4L2 API",
"Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>");
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->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->sink_query =
GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_query);
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_properties_helper (gobject_class,
DEFAULT_PROP_DEVICE);
/**
* GstV4l2VideoDec:capture-io-mode
*
* Capture IO Mode
*/
g_object_class_install_property (gobject_class, PROP_IO_MODE,
g_param_spec_enum ("capture-io-mode", "Capture IO mode",
"Capture I/O mode",
GST_TYPE_V4L2_IO_MODE, GST_V4L2_IO_AUTO,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
/* Probing functions */
static GstCaps *
gst_v4l2_video_dec_probe_caps (gchar * device, gint video_fd,
enum v4l2_buf_type type, GstCaps * filter)
{
gint n;
struct v4l2_fmtdesc format;
GstCaps *ret, *caps;
GST_DEBUG ("Getting %s format enumerations", device);
caps = gst_caps_new_empty ();
for (n = 0;; n++) {
GstStructure *template;
memset (&format, 0, sizeof (format));
format.index = n;
format.type = type;
if (v4l2_ioctl (video_fd, VIDIOC_ENUM_FMT, &format) < 0)
break; /* end of enumeration */
GST_LOG ("index: %u", format.index);
GST_LOG ("type: %d", format.type);
GST_LOG ("flags: %08x", format.flags);
GST_LOG ("description: '%s'", format.description);
GST_LOG ("pixelformat: %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (format.pixelformat));
template = gst_v4l2_object_v4l2fourcc_to_structure (format.pixelformat);
if (template)
gst_caps_append_structure (caps, template);
}
caps = gst_caps_simplify (caps);
ret = gst_caps_intersect (filter, caps);
gst_caps_unref (filter);
gst_caps_unref (caps);
return ret;
}
gboolean
gst_v4l2_video_dec_register (GstPlugin * plugin)
{
gint i = -1;
gchar *device = NULL;
GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_dec_debug, "v4l2videodec", 0,
"V4L2 Video Decoder");
while (TRUE) {
GstCaps *src_caps, *sink_caps;
gint video_fd;
g_free (device);
device = g_strdup_printf ("/dev/video%d", ++i);
if (!g_file_test (device, G_FILE_TEST_EXISTS))
break;
video_fd = open (device, O_RDWR);
if (video_fd == -1) {
GST_WARNING ("Failed to open %s", device);
continue;
}
/* get sink supported format (no MPLANE for codec) */
sink_caps = gst_v4l2_video_dec_probe_caps (device, video_fd,
V4L2_BUF_TYPE_VIDEO_OUTPUT, gst_v4l2_object_get_codec_caps ());
/* get src supported format */
src_caps = gst_caps_merge (gst_v4l2_video_dec_probe_caps (device, video_fd,
V4L2_BUF_TYPE_VIDEO_CAPTURE, gst_v4l2_object_get_raw_caps ()),
gst_v4l2_video_dec_probe_caps (device, video_fd,
V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE,
gst_v4l2_object_get_raw_caps ()));
if (!gst_caps_is_empty (sink_caps) && !gst_caps_is_empty (src_caps)) {
GTypeQuery type_query;
GTypeInfo type_info = { 0, };
GType type, subtype;
gchar *type_name;
Gstv4l2VideoDecQData *qdata;
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_name = g_strdup_printf ("v4l2video%ddec", i);
subtype = g_type_register_static (type, type_name, &type_info, 0);
qdata = g_new0 (Gstv4l2VideoDecQData, 1);
qdata->device = g_strdup (device);
qdata->sink_caps = gst_caps_ref (sink_caps);
qdata->src_caps = gst_caps_ref (src_caps);
g_type_set_qdata (subtype, V4L2_VIDEO_DEC_QUARK, qdata);
gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype);
g_free (type_name);
}
close (video_fd);
gst_caps_unref (src_caps);
gst_caps_unref (sink_caps);
}
g_free (device);
return TRUE;
}