/* * 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 "gstv4l2object.h" #include "gstv4l2videodec.h" #include "gstv4l2h264codec.h" #include "gstv4l2h265codec.h" #include "gstv4l2mpeg2codec.h" #include "gstv4l2mpeg4codec.h" #include "gstv4l2vp8codec.h" #include "gstv4l2vp9codec.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; const gchar *longname; const gchar *description; const GstV4l2Codec *codec; } GstV4l2VideoDecCData; enum { PROP_0, V4L2_STD_OBJECT_PROPS }; #define gst_v4l2_video_dec_parent_class parent_class G_DEFINE_ABSTRACT_TYPE (GstV4l2VideoDec, gst_v4l2_video_dec, GST_TYPE_VIDEO_DECODER); static GstFlowReturn gst_v4l2_video_dec_finish (GstVideoDecoder * decoder); static void gst_v4l2_video_dec_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object); switch (prop_id) { case PROP_CAPTURE_IO_MODE: if (!gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value, pspec)) { G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); } break; /* By default, only set on output */ default: if (!gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value, pspec)) { G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); } break; } } static void gst_v4l2_video_dec_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object); switch (prop_id) { case PROP_CAPTURE_IO_MODE: if (!gst_v4l2_object_get_property_helper (self->v4l2capture, prop_id, value, pspec)) { G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); } break; /* By default read from output */ default: if (!gst_v4l2_object_get_property_helper (self->v4l2output, prop_id, value, pspec)) { G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); } break; } } static gboolean gst_v4l2_video_dec_open (GstVideoDecoder * decoder) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder); GstV4l2Error error = GST_V4L2_ERROR_INIT; GstCaps *codec_caps; GST_DEBUG_OBJECT (self, "Opening"); if (!gst_v4l2_object_open (self->v4l2output, &error)) goto failure; if (!gst_v4l2_object_open_shared (self->v4l2capture, self->v4l2output)) goto failure; codec_caps = gst_pad_get_pad_template_caps (decoder->sinkpad); self->probed_sinkcaps = gst_v4l2_object_probe_caps (self->v4l2output, codec_caps); gst_caps_unref (codec_caps); if (gst_caps_is_empty (self->probed_sinkcaps)) goto no_encoded_format; return TRUE; no_encoded_format: GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS, (_("Decoder on device %s has no supported input format"), self->v4l2output->videodev), (NULL)); goto failure; failure: if (GST_V4L2_IS_OPEN (self->v4l2output)) gst_v4l2_object_close (self->v4l2output); if (GST_V4L2_IS_OPEN (self->v4l2capture)) gst_v4l2_object_close (self->v4l2capture); gst_caps_replace (&self->probed_srccaps, NULL); gst_caps_replace (&self->probed_sinkcaps, NULL); gst_v4l2_error (self, &error); return FALSE; } static gboolean gst_v4l2_video_dec_close (GstVideoDecoder * decoder) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder); GST_DEBUG_OBJECT (self, "Closing"); gst_v4l2_object_close (self->v4l2output); gst_v4l2_object_close (self->v4l2capture); gst_caps_replace (&self->probed_srccaps, NULL); gst_caps_replace (&self->probed_sinkcaps, NULL); return TRUE; } static gboolean gst_v4l2_video_dec_start (GstVideoDecoder * decoder) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder); GST_DEBUG_OBJECT (self, "Starting"); gst_v4l2_object_unlock (self->v4l2output); g_atomic_int_set (&self->active, TRUE); g_atomic_int_set (&self->capture_configuration_change, FALSE); self->output_flow = GST_FLOW_OK; return TRUE; } static gboolean gst_v4l2_video_dec_stop (GstVideoDecoder * decoder) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder); GST_DEBUG_OBJECT (self, "Stopping"); gst_v4l2_object_unlock (self->v4l2output); gst_v4l2_object_unlock (self->v4l2capture); /* Wait for capture thread to stop */ gst_pad_stop_task (decoder->srcpad); GST_VIDEO_DECODER_STREAM_LOCK (decoder); self->output_flow = GST_FLOW_OK; GST_VIDEO_DECODER_STREAM_UNLOCK (decoder); /* Should have been flushed already */ g_assert (g_atomic_int_get (&self->active) == FALSE); gst_v4l2_object_stop (self->v4l2output); gst_v4l2_object_stop (self->v4l2capture); if (self->input_state) { gst_video_codec_state_unref (self->input_state); self->input_state = NULL; } GST_DEBUG_OBJECT (self, "Stopped"); return TRUE; } static gboolean compatible_caps (GstV4l2VideoDec * self, GstCaps * new_caps) { GstCaps *current_caps, *caps1, *caps2; GstStructure *s; gboolean ret; current_caps = gst_v4l2_object_get_current_caps (self->v4l2output); if (!current_caps) return FALSE; caps1 = gst_caps_copy (current_caps); s = gst_caps_get_structure (caps1, 0); gst_structure_remove_field (s, "framerate"); caps2 = gst_caps_copy (new_caps); s = gst_caps_get_structure (caps2, 0); gst_structure_remove_field (s, "framerate"); ret = gst_caps_is_equal (caps1, caps2); gst_caps_unref (caps1); gst_caps_unref (caps2); gst_caps_unref (current_caps); return ret; } static gboolean gst_v4l2_video_dec_set_format (GstVideoDecoder * decoder, GstVideoCodecState * state) { 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 (compatible_caps (self, state->caps)) { GST_DEBUG_OBJECT (self, "Compatible caps"); goto done; } gst_video_codec_state_unref (self->input_state); self->input_state = NULL; gst_v4l2_video_dec_finish (decoder); gst_v4l2_object_stop (self->v4l2output); /* The renegotiation flow don't blend with the base class flow. To properly * stop the capture pool, if the buffers can't be orphaned, we need to * reclaim our buffers, which will happend through the allocation query. * The allocation query is triggered by gst_video_decoder_negotiate() which * requires the output caps to be set, but we can't know this information * as we rely on the decoder, which requires the capture queue to be * stopped. * * To workaround this issue, we simply run an allocation query with the * old negotiated caps in order to drain/reclaim our buffers. That breaks * the complexity and should not have much impact in performance since the * following allocation query will happen on a drained pipeline and won't * block. */ if (self->v4l2capture->pool && !gst_v4l2_buffer_pool_orphan (&self->v4l2capture->pool)) { GstCaps *caps = gst_pad_get_current_caps (decoder->srcpad); if (caps) { GstQuery *query = gst_query_new_allocation (caps, FALSE); gst_pad_peer_query (decoder->srcpad, query); gst_query_unref (query); gst_caps_unref (caps); } } gst_v4l2_object_stop (self->v4l2capture); self->output_flow = GST_FLOW_OK; } ret = gst_v4l2_object_set_format (self->v4l2output, state->caps, &error); gst_caps_replace (&self->probed_srccaps, NULL); self->probed_srccaps = gst_v4l2_object_probe_caps (self->v4l2capture, gst_v4l2_object_get_raw_caps ()); if (gst_caps_is_empty (self->probed_srccaps)) goto no_raw_format; if (ret) self->input_state = gst_video_codec_state_ref (state); else gst_v4l2_error (self, &error); done: return ret; no_raw_format: GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS, (_("Decoder on device %s has no supported output format"), self->v4l2output->videodev), (NULL)); return GST_FLOW_ERROR; } static gboolean gst_v4l2_video_dec_flush (GstVideoDecoder * decoder) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder); GST_DEBUG_OBJECT (self, "Flushed"); /* Ensure the processing thread has stopped for the reverse playback * discount case */ if (gst_pad_get_task_state (decoder->srcpad) == GST_TASK_STARTED) { GST_VIDEO_DECODER_STREAM_UNLOCK (decoder); gst_v4l2_object_unlock (self->v4l2output); gst_v4l2_object_unlock (self->v4l2capture); gst_pad_stop_task (decoder->srcpad); GST_VIDEO_DECODER_STREAM_LOCK (decoder); } if (G_UNLIKELY (!g_atomic_int_get (&self->active))) return TRUE; self->output_flow = GST_FLOW_OK; gst_v4l2_object_unlock_stop (self->v4l2output); gst_v4l2_object_unlock_stop (self->v4l2capture); if (self->v4l2output->pool) gst_v4l2_buffer_pool_flush (self->v4l2output->pool); /* gst_v4l2_buffer_pool_flush() calls streamon the capture pool and must be * called after gst_v4l2_object_unlock_stop() stopped flushing the buffer * pool. */ if (self->v4l2capture->pool) gst_v4l2_buffer_pool_flush (self->v4l2capture->pool); return TRUE; } static gboolean gst_v4l2_video_dec_negotiate (GstVideoDecoder * decoder) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder); /* We don't allow renegotiation without careful 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 (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_DECODER_CMD, &dcmd) < 0) goto dcmd_failed; return TRUE; dcmd_failed: if (errno == ENOTTY) { GST_INFO_OBJECT (v4l2object->element, "Failed to send decoder command %u with flags %u for '%s'. (%s)", cmd, flags, v4l2object->videodev, g_strerror (errno)); } else { GST_ERROR_OBJECT (v4l2object->element, "Failed to send decoder command %u with flags %u for '%s'. (%s)", cmd, flags, v4l2object->videodev, g_strerror (errno)); } return FALSE; } static GstFlowReturn gst_v4l2_video_dec_finish (GstVideoDecoder * decoder) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder); GstFlowReturn ret = GST_FLOW_OK; GstBuffer *buffer; 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; GST_OBJECT_LOCK (decoder->srcpad); task = GST_PAD_TASK (decoder->srcpad); if (task) gst_object_ref (task); GST_OBJECT_UNLOCK (decoder->srcpad); if (task) { /* If the decoder stop command succeeded, just wait until processing is * finished */ GST_DEBUG_OBJECT (self, "Waiting for decoder stop"); GST_OBJECT_LOCK (task); while (GST_TASK_STATE (task) == GST_TASK_STARTED) GST_TASK_WAIT (task); GST_OBJECT_UNLOCK (task); ret = GST_FLOW_FLUSHING; gst_object_unref (task); } } else { /* 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, NULL); gst_buffer_unref (buffer); } } /* and ensure the processing thread has stopped in case another error * occurred. */ gst_v4l2_object_unlock (self->v4l2capture); gst_pad_stop_task (decoder->srcpad); GST_VIDEO_DECODER_STREAM_LOCK (decoder); if (ret == GST_FLOW_FLUSHING) ret = self->output_flow; GST_DEBUG_OBJECT (decoder, "Done draining buffers"); /* TODO Shall we cleanup any reffed frame to workaround broken decoders ? */ done: return ret; } static GstFlowReturn gst_v4l2_video_dec_drain (GstVideoDecoder * decoder) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder); GST_DEBUG_OBJECT (self, "Draining..."); gst_v4l2_video_dec_finish (decoder); gst_v4l2_video_dec_flush (decoder); return GST_FLOW_OK; } static gboolean check_system_frame_number_too_old (guint32 current, guint32 old) { guint32 absdiff = current > old ? current - old : old - current; /* More than 100 frames in the past, or current wrapped around */ if (absdiff > 100) { /* Wraparound and difference is actually smaller than 100 */ if (absdiff > G_MAXUINT32 - 100) return FALSE; return TRUE; } return FALSE; } static gboolean gst_v4l2_video_remove_padding (GstCapsFeatures * features, GstStructure * structure, gpointer user_data) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (user_data); GstVideoAlignment *align = &self->v4l2capture->align; GstVideoInfo *info = &self->v4l2capture->info; int width, height; if (!gst_structure_get_int (structure, "width", &width)) return TRUE; if (!gst_structure_get_int (structure, "height", &height)) return TRUE; if (align->padding_left != 0 || align->padding_top != 0 || height != info->height + align->padding_bottom) return TRUE; if (height == info->height + align->padding_bottom) { /* Some drivers may round up width to the padded with */ if (width == info->width + align->padding_right) gst_structure_set (structure, "width", G_TYPE_INT, width - align->padding_right, "height", G_TYPE_INT, height - align->padding_bottom, NULL); /* Some drivers may keep visible width and only round up bytesperline */ else if (width == info->width) gst_structure_set (structure, "height", G_TYPE_INT, height - align->padding_bottom, NULL); } return TRUE; } static GstFlowReturn gst_v4l2_video_dec_setup_capture (GstVideoDecoder * decoder) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder); GstV4l2Error error = GST_V4L2_ERROR_INIT; GstVideoInfo info; GstVideoCodecState *output_state; GstCaps *acquired_caps, *available_caps, *caps, *filter; GstStructure *st; if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) { /* init capture fps according to output */ self->v4l2capture->info.fps_d = self->v4l2output->info.fps_d; self->v4l2capture->info.fps_n = self->v4l2output->info.fps_n; /* For decoders G_FMT returns coded size, G_SELECTION returns visible size * in the compose rectangle. gst_v4l2_object_acquire_format() checks both * and returns the visible size as with/height and the coded size as * padding. */ if (!gst_v4l2_object_acquire_format (self->v4l2capture, &info)) goto not_negotiated; /* gst_v4l2_object_acquire_format() does not set fps, copy from sink */ info.fps_n = self->v4l2output->info.fps_n; info.fps_d = self->v4l2output->info.fps_d; gst_v4l2_object_clear_format_list (self->v4l2capture); gst_caps_replace (&self->probed_srccaps, NULL); self->probed_srccaps = gst_v4l2_object_probe_caps (self->v4l2capture, gst_v4l2_object_get_raw_caps ()); /* Create caps from the acquired format, remove the format field */ acquired_caps = gst_video_info_to_caps (&info); GST_DEBUG_OBJECT (self, "Acquired caps: %" GST_PTR_FORMAT, acquired_caps); st = gst_caps_get_structure (acquired_caps, 0); gst_structure_remove_fields (st, "format", "colorimetry", "chroma-site", NULL); /* Probe currently available pixel formats */ available_caps = gst_caps_copy (self->probed_srccaps); GST_DEBUG_OBJECT (self, "Available caps: %" GST_PTR_FORMAT, available_caps); /* Replace coded size with visible size, we want to negotiate visible size * with downstream, not coded size. */ gst_caps_map_in_place (available_caps, gst_v4l2_video_remove_padding, self); filter = gst_caps_intersect_full (available_caps, acquired_caps, GST_CAPS_INTERSECT_FIRST); GST_DEBUG_OBJECT (self, "Filtered caps: %" GST_PTR_FORMAT, filter); 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; output_state->info.colorimetry = info.colorimetry; gst_video_codec_state_unref (output_state); gst_v4l2_buffer_pool_enable_resolution_change (GST_V4L2_BUFFER_POOL (self->v4l2capture->pool)); 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; } return GST_FLOW_OK; not_negotiated: GST_ERROR_OBJECT (self, "not negotiated"); gst_v4l2_error (self, &error); return GST_FLOW_NOT_NEGOTIATED; activate_failed: GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS, (_("Failed to allocate required memory.")), ("Buffer pool activation failed")); return GST_FLOW_ERROR; flushing: return GST_FLOW_FLUSHING; } static void gst_v4l2_video_dec_loop (GstVideoDecoder * decoder) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder); GstV4l2BufferPool *v4l2_pool; GstBufferPool *pool; GstVideoCodecFrame *frame; GstBuffer *buffer = NULL; GstFlowReturn ret; GST_VIDEO_DECODER_STREAM_LOCK (decoder); if (g_atomic_int_get (&self->capture_configuration_change)) { gst_v4l2_object_stop (self->v4l2capture); ret = gst_v4l2_video_dec_setup_capture (decoder); if (ret != GST_FLOW_OK) { GST_VIDEO_DECODER_STREAM_UNLOCK (decoder); return; } g_atomic_int_set (&self->capture_configuration_change, FALSE); } GST_VIDEO_DECODER_STREAM_UNLOCK (decoder); if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) return; GST_LOG_OBJECT (decoder, "Allocate output buffer"); v4l2_pool = GST_V4L2_BUFFER_POOL (self->v4l2capture->pool); 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_V4L2_FLOW_RESOLUTION_CHANGE) { GST_WARNING_OBJECT (decoder, "Received resolution change"); g_atomic_int_set (&self->capture_configuration_change, TRUE); return; } if (ret != GST_FLOW_OK) goto beach; GST_LOG_OBJECT (decoder, "Process output buffer"); ret = gst_v4l2_buffer_pool_process (v4l2_pool, &buffer, NULL); } while (ret == GST_V4L2_FLOW_CORRUPTED_BUFFER); if (ret != GST_FLOW_OK) goto beach; if (GST_BUFFER_TIMESTAMP (buffer) % GST_SECOND != 0) GST_ERROR_OBJECT (decoder, "Driver bug detected - check driver with v4l2-compliance from http://git.linuxtv.org/v4l-utils.git"); GST_LOG_OBJECT (decoder, "Got buffer for frame number %u", (guint32) (GST_BUFFER_TIMESTAMP (buffer) / GST_SECOND)); frame = gst_video_decoder_get_frame (decoder, GST_BUFFER_TIMESTAMP (buffer) / GST_SECOND); if (frame) { GstVideoCodecFrame *oldest_frame; gboolean warned = FALSE; /* Garbage collect old frames in case of codec bugs */ while ((oldest_frame = gst_video_decoder_get_oldest_frame (decoder)) && check_system_frame_number_too_old (frame->system_frame_number, oldest_frame->system_frame_number)) { gst_video_decoder_drop_frame (decoder, oldest_frame); oldest_frame = NULL; if (!warned) { g_warning ("%s: Too old frames, bug in decoder -- please file a bug", GST_ELEMENT_NAME (decoder)); warned = TRUE; } } if (oldest_frame) gst_video_codec_frame_unref (oldest_frame); frame->duration = self->v4l2capture->duration; frame->output_buffer = buffer; buffer = NULL; ret = gst_video_decoder_finish_frame (decoder, frame); if (ret != GST_FLOW_OK) goto beach; } else { GST_WARNING_OBJECT (decoder, "Decoder is producing too many buffers"); gst_buffer_unref (buffer); } return; beach: GST_DEBUG_OBJECT (decoder, "Leaving output thread: %s", gst_flow_get_name (ret)); gst_buffer_replace (&buffer, NULL); self->output_flow = ret; gst_v4l2_object_unlock (self->v4l2output); gst_pad_pause_task (decoder->srcpad); } static GstFlowReturn gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder, GstVideoCodecFrame * frame) { GstV4l2Error error = GST_V4L2_ERROR_INIT; GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder); GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool); GstFlowReturn ret = GST_FLOW_OK; gboolean processed = FALSE; GstBuffer *tmp; GstTaskState task_state; GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number); if (G_UNLIKELY (!g_atomic_int_get (&self->active))) goto flushing; if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2output))) { if (!self->input_state) goto not_negotiated; if (!gst_v4l2_object_set_format (self->v4l2output, self->input_state->caps, &error)) goto not_negotiated; } if (!g_atomic_int_get (&self->capture_configuration_change)) { ret = gst_v4l2_video_dec_setup_capture (decoder); if (ret != GST_FLOW_OK) { GST_ERROR_OBJECT (decoder, "setup capture fail\n"); goto not_negotiated; } } if (G_UNLIKELY (!gst_buffer_pool_is_active (pool))) { GstBuffer *codec_data; GstStructure *config = gst_buffer_pool_get_config (pool); guint min = MAX (self->v4l2output->min_buffers, GST_V4L2_MIN_BUFFERS (self->v4l2output)); guint max = VIDEO_MAX_FRAME; guint32 dummy_frame_number = 0; GST_DEBUG_OBJECT (self, "Sending header"); codec_data = self->input_state->codec_data; /* We are running in byte-stream mode, so we don't know the headers, but * we need to send something, otherwise the decoder will refuse to * initialize. */ if (codec_data) { gst_buffer_ref (codec_data); } else { codec_data = gst_buffer_ref (frame->input_buffer); processed = TRUE; } /* Ensure input internal pool is active */ gst_buffer_pool_config_set_params (config, self->input_state->caps, self->v4l2output->info.size, min, max); /* There is no reason to refuse this config */ if (!gst_buffer_pool_set_config (pool, config)) goto activate_failed; if (!gst_buffer_pool_set_active (pool, TRUE)) goto activate_failed; GST_VIDEO_DECODER_STREAM_UNLOCK (decoder); GST_LOG_OBJECT (decoder, "Passing buffer with system frame number %u", processed ? frame->system_frame_number : 0); ret = gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self-> v4l2output->pool), &codec_data, processed ? &frame->system_frame_number : &dummy_frame_number); GST_VIDEO_DECODER_STREAM_LOCK (decoder); gst_buffer_unref (codec_data); } task_state = gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (self)); if (task_state == GST_TASK_STOPPED || task_state == GST_TASK_PAUSED) { /* It's possible that the processing thread stopped due to an error */ if (self->output_flow != GST_FLOW_OK && self->output_flow != GST_FLOW_FLUSHING) { GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving"); ret = self->output_flow; goto drop; } GST_DEBUG_OBJECT (self, "Starting decoding thread"); /* Start the processing task, when it quits, the task will disable input * processing to unlock input if draining, or prevent potential block */ self->output_flow = GST_FLOW_FLUSHING; if (!gst_pad_start_task (decoder->srcpad, (GstTaskFunction) gst_v4l2_video_dec_loop, self, NULL)) goto start_task_failed; } if (!processed) { GST_VIDEO_DECODER_STREAM_UNLOCK (decoder); GST_LOG_OBJECT (decoder, "Passing buffer with system frame number %u", frame->system_frame_number); ret = gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output-> pool), &frame->input_buffer, &frame->system_frame_number); GST_VIDEO_DECODER_STREAM_LOCK (decoder); if (ret == GST_FLOW_FLUSHING) { if (gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (self)) != GST_TASK_STARTED) ret = self->output_flow; goto drop; } else if (ret != GST_FLOW_OK) { goto process_failed; } } /* No need to keep input around */ tmp = frame->input_buffer; frame->input_buffer = gst_buffer_new (); gst_buffer_copy_into (frame->input_buffer, tmp, GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_META, 0, 0); gst_buffer_unref (tmp); gst_video_codec_frame_unref (frame); 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; GstEventType type = GST_EVENT_TYPE (event); switch (type) { case GST_EVENT_FLUSH_START: GST_DEBUG_OBJECT (self, "flush start"); gst_v4l2_object_unlock (self->v4l2output); gst_v4l2_object_unlock (self->v4l2capture); break; default: break; } ret = GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event); switch (type) { case GST_EVENT_FLUSH_START: /* The processing thread should stop now, wait for it */ gst_pad_stop_task (decoder->srcpad); GST_DEBUG_OBJECT (self, "flush start done"); break; default: break; } return ret; } static GstStateChangeReturn gst_v4l2_video_dec_change_state (GstElement * element, GstStateChange transition) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (element); GstVideoDecoder *decoder = GST_VIDEO_DECODER (element); if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) { g_atomic_int_set (&self->active, FALSE); gst_v4l2_object_unlock (self->v4l2output); gst_v4l2_object_unlock (self->v4l2capture); gst_pad_stop_task (decoder->srcpad); } return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); } static void gst_v4l2_video_dec_dispose (GObject * object) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object); gst_caps_replace (&self->probed_sinkcaps, NULL); gst_caps_replace (&self->probed_srccaps, NULL); G_OBJECT_CLASS (parent_class)->dispose (object); } static void gst_v4l2_video_dec_finalize (GObject * object) { GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object); gst_v4l2_object_destroy (self->v4l2capture); gst_v4l2_object_destroy (self->v4l2output); G_OBJECT_CLASS (parent_class)->finalize (object); } static void gst_v4l2_video_dec_init (GstV4l2VideoDec * self) { /* V4L2 object are created in subinstance_init */ } static void gst_v4l2_video_dec_subinstance_init (GTypeInstance * instance, gpointer g_class) { GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class); GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (instance); GstVideoDecoder *decoder = GST_VIDEO_DECODER (instance); gst_video_decoder_set_packetized (decoder, TRUE); self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self), GST_OBJECT (GST_VIDEO_DECODER_SINK_PAD (self)), V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device, gst_v4l2_get_output, gst_v4l2_set_output, NULL); self->v4l2output->no_initial_format = TRUE; self->v4l2output->keep_aspect = FALSE; self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self), GST_OBJECT (GST_VIDEO_DECODER_SRC_PAD (self)), V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device, gst_v4l2_get_input, gst_v4l2_set_input, NULL); } static void gst_v4l2_video_dec_class_init (GstV4l2VideoDecClass * klass) { GstElementClass *element_class; GObjectClass *gobject_class; GstVideoDecoderClass *video_decoder_class; parent_class = g_type_class_peek_parent (klass); element_class = (GstElementClass *) klass; gobject_class = (GObjectClass *) klass; video_decoder_class = (GstVideoDecoderClass *) klass; GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_dec_debug, "v4l2videodec", 0, "V4L2 Video Decoder"); gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_dispose); gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finalize); gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_get_property); video_decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_open); video_decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_close); video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_start); video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_stop); video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finish); video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_flush); video_decoder_class->drain = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_drain); video_decoder_class->set_format = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_format); video_decoder_class->negotiate = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_negotiate); video_decoder_class->decide_allocation = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_decide_allocation); /* FIXME propose_allocation or not ? */ video_decoder_class->handle_frame = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_handle_frame); video_decoder_class->getcaps = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_getcaps); video_decoder_class->src_query = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_src_query); video_decoder_class->sink_event = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_event); element_class->change_state = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_change_state); gst_v4l2_object_install_m2m_properties_helper (gobject_class); } static void gst_v4l2_video_dec_subclass_init (gpointer g_class, gpointer data) { GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class); GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); GstV4l2VideoDecCData *cdata = data; klass->default_device = cdata->device; gst_element_class_add_pad_template (element_class, gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, cdata->sink_caps)); gst_element_class_add_pad_template (element_class, gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS, cdata->src_caps)); gst_element_class_set_metadata (element_class, cdata->longname, "Codec/Decoder/Video/Hardware", cdata->description, "Nicolas Dufresne "); gst_caps_unref (cdata->sink_caps); gst_caps_unref (cdata->src_caps); g_free (cdata); } /* Probing functions */ gboolean gst_v4l2_is_video_dec (GstCaps * sink_caps, GstCaps * src_caps) { gboolean ret = FALSE; if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_codec_caps ()) && gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ())) ret = TRUE; return ret; } static gchar * gst_v4l2_video_dec_set_metadata (GstStructure * s, GstV4l2VideoDecCData * cdata, const gchar * basename) { gchar *codec_name = NULL; gchar *type_name = NULL; #define SET_META(codec) \ G_STMT_START { \ cdata->longname = "V4L2 " codec " Decoder"; \ cdata->description = "Decodes " codec " streams via V4L2 API"; \ codec_name = g_ascii_strdown (codec, -1); \ } G_STMT_END if (gst_structure_has_name (s, "image/jpeg")) { SET_META ("JPEG"); } else if (gst_structure_has_name (s, "video/mpeg")) { gint mpegversion = 0; gst_structure_get_int (s, "mpegversion", &mpegversion); if (mpegversion == 2) { SET_META ("MPEG2"); cdata->codec = gst_v4l2_mpeg2_get_codec (); } else { SET_META ("MPEG4"); cdata->codec = gst_v4l2_mpeg4_get_codec (); } } else if (gst_structure_has_name (s, "video/x-h263")) { SET_META ("H263"); } else if (gst_structure_has_name (s, "video/x-fwht")) { SET_META ("FWHT"); } else if (gst_structure_has_name (s, "video/x-h264")) { SET_META ("H264"); cdata->codec = gst_v4l2_h264_get_codec (); } else if (gst_structure_has_name (s, "video/x-h265")) { SET_META ("H265"); cdata->codec = gst_v4l2_h265_get_codec (); } else if (gst_structure_has_name (s, "video/x-wmv")) { SET_META ("VC1"); } else if (gst_structure_has_name (s, "video/x-vp8")) { SET_META ("VP8"); cdata->codec = gst_v4l2_vp8_get_codec (); } else if (gst_structure_has_name (s, "video/x-vp9")) { SET_META ("VP9"); cdata->codec = gst_v4l2_vp9_get_codec (); } else if (gst_structure_has_name (s, "video/x-bayer")) { SET_META ("BAYER"); } else if (gst_structure_has_name (s, "video/x-sonix")) { SET_META ("SONIX"); } else if (gst_structure_has_name (s, "video/x-pwc1")) { SET_META ("PWC1"); } else if (gst_structure_has_name (s, "video/x-pwc2")) { SET_META ("PWC2"); } else { /* This code should be kept on sync with the exposed CODEC type of format * from gstv4l2object.c. This warning will only occur in case we forget * to also add a format here. */ gchar *s_str = gst_structure_to_string (s); g_warning ("Missing fixed name mapping for caps '%s', this is a GStreamer " "bug, please report at https://bugs.gnome.org", s_str); g_free (s_str); } if (codec_name) { type_name = g_strdup_printf ("v4l2%sdec", codec_name); if (g_type_from_name (type_name) != 0) { g_free (type_name); type_name = g_strdup_printf ("v4l2%s%sdec", basename, codec_name); } g_free (codec_name); } return type_name; #undef SET_META } void gst_v4l2_video_dec_register (GstPlugin * plugin, const gchar * basename, const gchar * device_path, gint video_fd, GstCaps * sink_caps, GstCaps * src_caps) { gint i; for (i = 0; i < gst_caps_get_size (sink_caps); i++) { GstV4l2VideoDecCData *cdata; GstStructure *s; GTypeQuery type_query; GTypeInfo type_info = { 0, }; GType type, subtype; gchar *type_name; s = gst_caps_get_structure (sink_caps, i); cdata = g_new0 (GstV4l2VideoDecCData, 1); cdata->device = g_strdup (device_path); cdata->sink_caps = gst_caps_new_empty (); gst_caps_append_structure (cdata->sink_caps, gst_structure_copy (s)); cdata->src_caps = gst_caps_ref (src_caps); type_name = gst_v4l2_video_dec_set_metadata (s, cdata, basename); /* Skip over if we hit an unmapped type */ if (!type_name) { g_free (cdata); continue; } if (cdata->codec != NULL && cdata->codec != gst_v4l2_vp8_get_codec () && cdata->codec != gst_v4l2_vp9_get_codec ()) { GValue value = G_VALUE_INIT; if (gst_v4l2_codec_probe_levels (cdata->codec, video_fd, &value)) { gst_caps_set_value (cdata->sink_caps, "level", &value); g_value_unset (&value); } if (gst_v4l2_codec_probe_profiles (cdata->codec, video_fd, &value)) { gst_caps_set_value (cdata->sink_caps, "profile", &value); g_value_unset (&value); } } type = gst_v4l2_video_dec_get_type (); g_type_query (type, &type_query); memset (&type_info, 0, sizeof (type_info)); type_info.class_size = type_query.class_size; type_info.instance_size = type_query.instance_size; type_info.class_init = gst_v4l2_video_dec_subclass_init; type_info.class_data = cdata; type_info.instance_init = gst_v4l2_video_dec_subinstance_init; subtype = g_type_register_static (type, type_name, &type_info, 0); if (!gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype)) GST_WARNING ("Failed to register plugin '%s'", type_name); g_free (type_name); } }