/* * Copyright (C) 2014-2017 SUMOMO Computer Association * Authors Ayaka * Copyright (C) 2017 Collabora Ltd. * Author: Nicolas Dufresne * * 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 #include #include #include #include #include "gstv4l2videoenc.h" #include "v4l2_calls.h" #include #include GST_DEBUG_CATEGORY_STATIC (gst_v4l2_video_enc_debug); #define GST_CAT_DEFAULT gst_v4l2_video_enc_debug typedef struct { gchar *device; GstCaps *sink_caps; GstCaps *src_caps; } GstV4l2VideoEncCData; enum { PROP_0, V4L2_STD_OBJECT_PROPS, }; #define gst_v4l2_video_enc_parent_class parent_class G_DEFINE_ABSTRACT_TYPE (GstV4l2VideoEnc, gst_v4l2_video_enc, GST_TYPE_VIDEO_ENCODER); static void gst_v4l2_video_enc_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (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_enc_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object); switch (prop_id) { case PROP_OUTPUT_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_enc_open (GstVideoEncoder * encoder) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); 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_raw_caps ()); if (gst_caps_is_empty (self->probed_sinkcaps)) goto no_raw_format; self->probed_srccaps = gst_v4l2_object_get_caps (self->v4l2capture, gst_v4l2_object_get_codec_caps ()); if (gst_caps_is_empty (self->probed_srccaps)) goto no_encoded_format; return TRUE; no_encoded_format: GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS, (_("Encoder on device %s has no supported output format"), self->v4l2output->videodev), (NULL)); goto failure; no_raw_format: GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS, (_("Encoder 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); return FALSE; } static gboolean gst_v4l2_video_enc_close (GstVideoEncoder * encoder) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); 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_enc_start (GstVideoEncoder * encoder) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); 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_enc_stop (GstVideoEncoder * encoder) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); 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 (encoder->srcpad); GST_VIDEO_ENCODER_STREAM_LOCK (encoder); self->output_flow = GST_FLOW_OK; GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder); /* 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_encoder_cmd (GstV4l2Object * v4l2object, guint cmd, guint flags) { struct v4l2_encoder_cmd ecmd = { 0, }; GST_DEBUG_OBJECT (v4l2object->element, "sending v4l2 encoder command %u with flags %u", cmd, flags); if (!GST_V4L2_IS_OPEN (v4l2object)) return FALSE; ecmd.cmd = cmd; ecmd.flags = flags; if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENCODER_CMD, &ecmd) < 0) goto ecmd_failed; return TRUE; ecmd_failed: if (errno == ENOTTY) { GST_INFO_OBJECT (v4l2object->element, "Failed to send encoder command %u with flags %u for '%s'. (%s)", cmd, flags, v4l2object->videodev, g_strerror (errno)); } else { GST_ERROR_OBJECT (v4l2object->element, "Failed to send encoder command %u with flags %u for '%s'. (%s)", cmd, flags, v4l2object->videodev, g_strerror (errno)); } return FALSE; } static GstFlowReturn gst_v4l2_video_enc_finish (GstVideoEncoder * encoder) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); GstFlowReturn ret = GST_FLOW_OK; if (gst_pad_get_task_state (encoder->srcpad) != GST_TASK_STARTED) goto done; GST_DEBUG_OBJECT (self, "Finishing encoding"); /* drop the stream lock while draining, so remaining buffers can be * pushed from the src pad task thread */ GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder); if (gst_v4l2_encoder_cmd (self->v4l2capture, V4L2_ENC_CMD_STOP, 0)) { GstTask *task = encoder->srcpad->task; /* Wait for the task to be drained */ GST_OBJECT_LOCK (task); while (GST_TASK_STATE (task) == GST_TASK_STARTED) GST_TASK_WAIT (task); GST_OBJECT_UNLOCK (task); ret = GST_FLOW_FLUSHING; } /* and ensure the processing thread has stopped in case another error * occured. */ gst_v4l2_object_unlock (self->v4l2capture); gst_pad_stop_task (encoder->srcpad); GST_VIDEO_ENCODER_STREAM_LOCK (encoder); if (ret == GST_FLOW_FLUSHING) ret = self->output_flow; GST_DEBUG_OBJECT (encoder, "Done draining buffers"); done: return ret; } static gboolean gst_v4l2_video_enc_set_format (GstVideoEncoder * encoder, GstVideoCodecState * state) { gboolean ret = TRUE; GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); GstV4l2Error error = GST_V4L2_ERROR_INIT; GstCaps *outcaps; 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"); return TRUE; } if (gst_v4l2_video_enc_finish (encoder) != GST_FLOW_OK) return FALSE; gst_video_codec_state_unref (self->input_state); self->input_state = NULL; } outcaps = gst_pad_get_pad_template_caps (encoder->srcpad); outcaps = gst_caps_make_writable (outcaps); gst_video_encoder_set_output_state (encoder, outcaps, state); if (!gst_video_encoder_negotiate (encoder)) return FALSE; if (!gst_v4l2_object_set_format (self->v4l2output, state->caps, &error)) { gst_v4l2_error (self, &error); return FALSE; } self->input_state = gst_video_codec_state_ref (state); GST_DEBUG_OBJECT (self, "output caps: %" GST_PTR_FORMAT, state->caps); return ret; } static gboolean gst_v4l2_video_enc_flush (GstVideoEncoder * encoder) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); GST_DEBUG_OBJECT (self, "Flushing"); /* Ensure the processing thread has stopped for the reverse playback * iscount case */ if (g_atomic_int_get (&self->processing)) { GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder); gst_v4l2_object_unlock_stop (self->v4l2output); gst_v4l2_object_unlock_stop (self->v4l2capture); gst_pad_stop_task (encoder->srcpad); GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder); } 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_enc_negotiate (GstVideoEncoder * encoder) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); gboolean ret; ret = GST_VIDEO_ENCODER_CLASS (parent_class)->negotiate (encoder); if (!gst_buffer_pool_set_active (GST_BUFFER_POOL (self->v4l2capture->pool), TRUE)) { GST_WARNING_OBJECT (self, "Could not activate capture buffer pool."); ret = FALSE; } return ret; } static GstVideoCodecFrame * gst_v4l2_video_enc_get_oldest_frame (GstVideoEncoder * encoder) { GstVideoCodecFrame *frame = NULL; GList *frames, *l; gint count = 0; frames = gst_video_encoder_get_frames (encoder); 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 (encoder, "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_enc_loop (GstVideoEncoder * encoder) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); GstVideoCodecFrame *frame; GstBuffer *buffer = NULL; GstFlowReturn ret; GST_LOG_OBJECT (encoder, "Allocate output buffer"); buffer = gst_video_encoder_allocate_output_buffer (encoder, self->v4l2capture->info.size); if (NULL == buffer) { ret = GST_FLOW_FLUSHING; goto beach; } /* FIXME Check if buffer isn't the last one here */ GST_LOG_OBJECT (encoder, "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_enc_get_oldest_frame (encoder); if (frame) { frame->output_buffer = buffer; buffer = NULL; ret = gst_video_encoder_finish_frame (encoder, frame); if (ret != GST_FLOW_OK) goto beach; } else { GST_WARNING_OBJECT (encoder, "Encoder is producing too many buffers"); gst_buffer_unref (buffer); } return; beach: GST_DEBUG_OBJECT (encoder, "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 (encoder->srcpad); } static void gst_v4l2_video_enc_loop_stopped (GstV4l2VideoEnc * self) { if (g_atomic_int_get (&self->processing)) { GST_DEBUG_OBJECT (self, "Early stop of encoding thread"); self->output_flow = GST_FLOW_FLUSHING; g_atomic_int_set (&self->processing, FALSE); } GST_DEBUG_OBJECT (self, "Encoding task destroyed: %s", gst_flow_get_name (self->output_flow)); } static GstFlowReturn gst_v4l2_video_enc_handle_frame (GstVideoEncoder * encoder, GstVideoCodecFrame * frame) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); 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 (gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (self)) == GST_TASK_STOPPED) { GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool); /* It 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; } /* 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, self->v4l2output->min_buffers, self->v4l2output->min_buffers); /* 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_DEBUG_OBJECT (self, "Starting encoding thread"); /* Start the processing task, when it quits, the task will disable input * processing to unlock input if draining, or prevent potential block */ if (!gst_pad_start_task (encoder->srcpad, (GstTaskFunction) gst_v4l2_video_enc_loop, self, (GDestroyNotify) gst_v4l2_video_enc_loop_stopped)) goto start_task_failed; } if (frame->input_buffer) { GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder); ret = gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->pool), &frame->input_buffer); GST_VIDEO_ENCODER_STREAM_LOCK (encoder); 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; } } gst_video_codec_frame_unref (frame); return ret; /* ERRORS */ activate_failed: { GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS, (_("Failed to allocate required memory.")), ("Buffer pool activation failed")); return GST_FLOW_ERROR; } flushing: { ret = GST_FLOW_FLUSHING; goto drop; } start_task_failed: { GST_ELEMENT_ERROR (self, RESOURCE, FAILED, (_("Failed to start encoding 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_encoder_finish_frame (encoder, frame); return ret; } } static gboolean gst_v4l2_video_enc_decide_allocation (GstVideoEncoder * encoder, GstQuery * query) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); GstVideoCodecState *state = gst_video_encoder_get_output_state (encoder); GstV4l2Error error = GST_V4L2_ERROR_INIT; GstClockTime latency; gboolean ret = FALSE; /* We need to set the format here, since this is called right after * GstVideoEncoder have set the width, height and framerate into the state * caps. These are needed by the driver to calculate the buffer size and to * implement bitrate adaptation. */ if (!gst_v4l2_object_set_format (self->v4l2capture, state->caps, &error)) { gst_v4l2_error (self, &error); ret = FALSE; goto done; } if (gst_v4l2_object_decide_allocation (self->v4l2capture, query)) { GstVideoEncoderClass *enc_class = GST_VIDEO_ENCODER_CLASS (parent_class); ret = enc_class->decide_allocation (encoder, query); } /* FIXME This may not be entirely correct, as encoder may keep some * observation withouth delaying the encoding. Linux Media API need some * more work to explicitly expressed the decoder / encoder latency. This * value will then become max latency, and the reported driver latency would * become the min latency. */ latency = self->v4l2capture->min_buffers * self->v4l2capture->duration; gst_video_encoder_set_latency (encoder, latency, latency); done: gst_video_codec_state_unref (state); return ret; } static gboolean gst_v4l2_video_enc_propose_allocation (GstVideoEncoder * encoder, GstQuery * query) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); gboolean ret = FALSE; GST_DEBUG_OBJECT (self, "called"); if (query == NULL) ret = TRUE; else ret = gst_v4l2_object_propose_allocation (self->v4l2output, query); if (ret) ret = GST_VIDEO_ENCODER_CLASS (parent_class)->propose_allocation (encoder, query); return ret; } static gboolean gst_v4l2_video_enc_src_query (GstVideoEncoder * encoder, GstQuery * query) { gboolean ret = TRUE; GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); switch (GST_QUERY_TYPE (query)) { case GST_QUERY_CAPS:{ GstCaps *filter, *result = NULL; GstPad *pad = GST_VIDEO_ENCODER_SRC_PAD (encoder); gst_query_parse_caps (query, &filter); /* FIXME Try and not probe the entire encoder, but only the implement * subclass format */ if (self->probed_srccaps) { GstCaps *tmpl = gst_pad_get_pad_template_caps (pad); result = gst_caps_intersect (tmpl, self->probed_srccaps); gst_caps_unref (tmpl); } 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_ENCODER_CLASS (parent_class)->src_query (encoder, query); break; } return ret; } static gboolean gst_v4l2_video_enc_sink_query (GstVideoEncoder * encoder, GstQuery * query) { gboolean ret = TRUE; GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); switch (GST_QUERY_TYPE (query)) { case GST_QUERY_CAPS:{ GstCaps *filter, *result = NULL; GstPad *pad = GST_VIDEO_ENCODER_SINK_PAD (encoder); 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_ENCODER_CLASS (parent_class)->sink_query (encoder, query); break; } return ret; } static gboolean gst_v4l2_video_enc_sink_event (GstVideoEncoder * encoder, GstEvent * event) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder); 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_ENCODER_CLASS (parent_class)->sink_event (encoder, event); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_START: gst_pad_stop_task (encoder->srcpad); GST_DEBUG_OBJECT (self, "flush start done"); default: break; } return ret; } static GstStateChangeReturn gst_v4l2_video_enc_change_state (GstElement * element, GstStateChange transition) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (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_enc_dispose (GObject * object) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (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_enc_finalize (GObject * object) { GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (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_enc_init (GstV4l2VideoEnc * self) { /* V4L2 object are created in subinstance_init */ } static void gst_v4l2_video_enc_subinstance_init (GTypeInstance * instance, gpointer g_class) { GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_CLASS (g_class); GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (instance); 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_enc_class_init (GstV4l2VideoEncClass * klass) { GstElementClass *element_class; GObjectClass *gobject_class; GstVideoEncoderClass *video_encoder_class; parent_class = g_type_class_peek_parent (klass); element_class = (GstElementClass *) klass; gobject_class = (GObjectClass *) klass; video_encoder_class = (GstVideoEncoderClass *) klass; GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_enc_debug, "v4l2videoenc", 0, "V4L2 Video Encoder"); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_dispose); gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_finalize); gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_get_property); video_encoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_open); video_encoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_close); video_encoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_start); video_encoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_stop); video_encoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_finish); video_encoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_flush); video_encoder_class->set_format = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_set_format); video_encoder_class->negotiate = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_negotiate); video_encoder_class->decide_allocation = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_decide_allocation); video_encoder_class->propose_allocation = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_propose_allocation); video_encoder_class->sink_query = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_sink_query); video_encoder_class->src_query = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_src_query); video_encoder_class->sink_event = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_sink_event); video_encoder_class->handle_frame = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_handle_frame); element_class->change_state = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_change_state); gst_v4l2_object_install_m2m_properties_helper (gobject_class); } static void gst_v4l2_video_enc_subclass_init (gpointer g_class, gpointer data) { GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_CLASS (g_class); GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); GstV4l2VideoEncCData *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_enc (GstCaps * sink_caps, GstCaps * src_caps) { gboolean ret = FALSE; if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_raw_caps ()) && gst_caps_is_subset (src_caps, gst_v4l2_object_get_codec_caps ())) ret = TRUE; return ret; } gboolean gst_v4l2_video_enc_register (GstPlugin * plugin, GType type, const char *codec, const gchar * basename, const gchar * device_path, GstCaps * sink_caps, GstCaps * codec_caps, GstCaps * src_caps) { GstCaps *filtered_caps; GTypeQuery type_query; GTypeInfo type_info = { 0, }; GType subtype; gchar *type_name; GstV4l2VideoEncCData *cdata; filtered_caps = gst_caps_intersect (src_caps, codec_caps); cdata = g_new0 (GstV4l2VideoEncCData, 1); cdata->device = g_strdup (device_path); cdata->sink_caps = gst_caps_ref (sink_caps); cdata->src_caps = gst_caps_ref (filtered_caps); 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_enc_subclass_init; type_info.class_data = cdata; type_info.instance_init = gst_v4l2_video_enc_subinstance_init; /* The first encoder to be registered should use a constant name, like * v4l2h264enc, for any additional encoders, we create unique names. Encoder * names may change between boots, so this should help gain stable names for * the most common use cases. */ type_name = g_strdup_printf ("v4l2%senc", codec); if (g_type_from_name (type_name) != 0) { g_free (type_name); type_name = g_strdup_printf ("v4l2%s%senc", basename, codec); } 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; }