gstreamer/sys/v4l2/gstv4l2videodec.c
Nicolas Dufresne 57726911f8 v4l2videodec: don't stop if loop returned FLUSHING
The decodeing thread returning flushing isn't an error, we should simply
try starting the task again. If it's actually flushing, it will stop again by itself.
2014-05-24 15:38:53 -04:00

924 lines
26 KiB
C

/*
* 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>
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;
} 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 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_OUTPUT_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;
/* 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");
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);
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);
self->input_state = NULL;
/* 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, "Flushed");
/* Ensure the processing thread has stopped for the reverse playback
* discount case */
if (g_atomic_int_get (&self->processing)) {
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_UNLOCK (decoder);
}
self->output_flow = GST_FLOW_OK;
gst_v4l2_object_unlock_stop (self->v4l2output);
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 (!g_atomic_int_get (&self->processing))
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);
}
/* and ensure the processing thread has stopped in case another error
* occured. */
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");
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);
/* 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");
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: %s",
gst_flow_get_name (ret));
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 void
gst_v4l2_video_dec_loop_stopped (GstV4l2VideoDec * self)
{
/* When flushing, decoding thread may never run */
if (g_atomic_int_get (&self->processing)) {
GST_DEBUG_OBJECT (self, "Early stop of decoding thread");
self->output_flow = GST_FLOW_FLUSHING;
g_atomic_int_set (&self->processing, FALSE);
}
GST_DEBUG_OBJECT (self, "Decoding task destroyed: %s",
gst_flow_get_name (self->output_flow));
}
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 (!self->input_state)
goto not_negotiated;
if (!gst_v4l2_object_set_format (self->v4l2output, self->input_state->caps))
goto not_negotiated;
}
if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) {
GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool);
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;
}
/* Ensure input internal pool is active */
if (!gst_buffer_pool_is_active (pool)) {
GstStructure *config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set_params (config, self->input_state->caps,
self->v4l2output->info.size, 2, 2);
/* There is no reason to refuse this config */
if (!gst_buffer_pool_set_config (pool, config))
goto activate_failed;
if (!gst_buffer_pool_set_active (pool, TRUE))
goto activate_failed;
}
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
v4l2output->pool), &codec_data);
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
gst_buffer_unref (codec_data);
if (!gst_v4l2_object_acquire_format (self->v4l2capture, &info))
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;
}
/* Ensure our internal pool is activated */
if (!gst_buffer_pool_set_active (GST_BUFFER_POOL (self->v4l2capture->pool),
TRUE))
goto activate_failed;
}
if (g_atomic_int_get (&self->processing) == FALSE) {
/* 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 */
g_atomic_int_set (&self->processing, TRUE);
if (!gst_pad_start_task (decoder->srcpad,
(GstTaskFunction) gst_v4l2_video_dec_loop, self,
(GDestroyNotify) gst_v4l2_video_dec_loop_stopped))
goto start_task_failed;
}
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;
goto drop;
} else if (ret != GST_FLOW_OK) {
goto process_failed;
}
/* 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;
}
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));
g_atomic_int_set (&self->processing, FALSE);
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:
{
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;
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 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;
GstPad *pad = GST_VIDEO_DECODER_SINK_PAD (decoder);
gst_query_parse_caps (query, &filter);
if (self->probed_sinkcaps)
result = gst_caps_ref (self->probed_sinkcaps);
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 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);
gboolean ret;
switch (GST_EVENT_TYPE (event)) {
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 (GST_EVENT_TYPE (event)) {
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),
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),
V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
gst_v4l2_get_input, gst_v4l2_set_input, NULL);
self->v4l2capture->no_initial_format = TRUE;
self->v4l2output->keep_aspect = FALSE;
}
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");
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_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;
/* Note: gst_pad_template_new() take the floating ref from the caps */
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));
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;
}
gboolean
gst_v4l2_video_dec_register (GstPlugin * plugin, const gchar * basename,
const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps)
{
GTypeQuery type_query;
GTypeInfo type_info = { 0, };
GType type, subtype;
gchar *type_name;
GstV4l2VideoDecCData *cdata;
cdata = g_new0 (GstV4l2VideoDecCData, 1);
cdata->device = g_strdup (device_path);
cdata->sink_caps = gst_caps_ref (sink_caps);
cdata->src_caps = gst_caps_ref (src_caps);
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;
type_name = g_strdup_printf ("v4l2%sdec", basename);
subtype = g_type_register_static (type, type_name, &type_info, 0);
gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype);
g_free (type_name);
return TRUE;
}