/* * Copyright (C) 2014 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 "gstv4l2videodec.h" #include "v4l2_calls.h" #include #include 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; } 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_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->v4l2capture, prop_id, 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); 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) { GstV4l2Error error = GST_V4L2_ERROR_INIT; 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, &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); } 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) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder); /* We don't allow renegotiation without carefull disabling the pool */ if (self->v4l2capture->pool && gst_buffer_pool_is_active (GST_BUFFER_POOL (self->v4l2capture->pool))) return TRUE; return GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder); } 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 (v4l2_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; 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 (gst_v4l2_decoder_cmd (self->v4l2output, V4L2_DEC_CMD_STOP, 0)) { GstTask *task = decoder->srcpad->task; /* If the decoder stop command succeeded, just wait until processing is * finished */ GST_OBJECT_LOCK (task); while (GST_TASK_STATE (task) == GST_TASK_STARTED) GST_TASK_WAIT (task); GST_OBJECT_UNLOCK (task); ret = GST_FLOW_FLUSHING; } else { /* 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 (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); GstV4l2BufferPool *v4l2_pool = GST_V4L2_BUFFER_POOL (self->v4l2capture->pool); GstBufferPool *pool; GstVideoCodecFrame *frame; GstBuffer *buffer = NULL; GstFlowReturn ret; GST_LOG_OBJECT (decoder, "Allocate 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"); ret = gst_v4l2_buffer_pool_process (v4l2_pool, &buffer); } while (ret == GST_V4L2_FLOW_CORRUPTED_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; gst_v4l2_object_unlock (self->v4l2output); gst_pad_pause_task (decoder->srcpad); } 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 || width != info->width + align->padding_right || height != info->height + align->padding_bottom) return TRUE; gst_structure_set (structure, "width", G_TYPE_INT, width - align->padding_right, "height", G_TYPE_INT, height - align->padding_bottom, NULL); return TRUE; } 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); GstFlowReturn ret = GST_FLOW_OK; gboolean processed = FALSE; GstBuffer *tmp; 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; } 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; GstCaps *acquired_caps, *available_caps, *caps, *filter; GstStructure *st; 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 = gst_buffer_ref (frame->input_buffer); processed = TRUE; } /* 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); /* 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; /* Create caps from the acquired format, remove the format field */ acquired_caps = gst_video_info_to_caps (&info); st = gst_caps_get_structure (acquired_caps, 0); gst_structure_remove_field (st, "format"); /* Probe currently available pixel formats */ available_caps = gst_v4l2_object_probe_caps (self->v4l2capture, NULL); available_caps = gst_caps_make_writable (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, acquired_caps, GST_CAPS_INTERSECT_FIRST); gst_caps_unref (acquired_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; } /* 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); gst_caps_unref (caps); 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 (gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (self)) == GST_TASK_STOPPED) { /* 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; 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); 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 (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 arround */ 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); 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: { 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; 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 "); 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->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; /* 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; }