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gstreamer/gst-libs/gst/video/gstbasevideoencoder.c

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/* GStreamer
* Copyright (C) 2008 David Schleef <ds@schleef.org>
* Copyright (C) 2011 Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>.
* Copyright (C) 2011 Nokia Corporation. All rights reserved.
* Contact: Stefan Kost <stefan.kost@nokia.com>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:gstbasevideoencoder
* @short_description: Base class for video encoders
* @see_also: #GstBaseTransform
*
* This base class is for video encoders turning raw video into
* encoded video data.
*
* GstBaseVideoEncoder and subclass should cooperate as follows.
* <orderedlist>
* <listitem>
* <itemizedlist><title>Configuration</title>
* <listitem><para>
* Initially, GstBaseVideoEncoder calls @start when the encoder element
* is activated, which allows subclass to perform any global setup.
* </para></listitem>
* <listitem><para>
* GstBaseVideoEncoder calls @set_format to inform subclass of the format
* of input video data that it is about to receive. Subclass should
* setup for encoding and configure base class as appropriate
* (e.g. latency). While unlikely, it might be called more than once,
* if changing input parameters require reconfiguration. Baseclass
* will ensure that processing of current configuration is finished.
* </para></listitem>
* <listitem><para>
* GstBaseVideoEncoder calls @stop at end of all processing.
* </para></listitem>
* </itemizedlist>
* </listitem>
* <listitem>
* <itemizedlist>
* <title>Data processing</title>
* <listitem><para>
* Base class collects input data and metadata into a frame and hands
* this to subclass' @handle_frame.
* </para></listitem>
* <listitem><para>
* If codec processing results in encoded data, subclass should call
* @gst_base_video_encoder_finish_frame to have encoded data pushed
* downstream.
* </para></listitem>
* <listitem><para>
* If implemented, baseclass calls subclass @shape_output which then sends
* data downstream in desired form. Otherwise, it is sent as-is.
* </para></listitem>
* <listitem><para>
* GstBaseVideoEncoderClass will handle both srcpad and sinkpad events.
* Sink events will be passed to subclass if @event callback has been
* provided.
* </para></listitem>
* </itemizedlist>
* </listitem>
* <listitem>
* <itemizedlist><title>Shutdown phase</title>
* <listitem><para>
* GstBaseVideoEncoder class calls @stop to inform the subclass that data
* parsing will be stopped.
* </para></listitem>
* </itemizedlist>
* </listitem>
* </orderedlist>
*
* Subclass is responsible for providing pad template caps for
* source and sink pads. The pads need to be named "sink" and "src". It should
* also be able to provide fixed src pad caps in @getcaps by the time it calls
* @gst_base_video_encoder_finish_frame.
*
* Things that subclass need to take care of:
* <itemizedlist>
* <listitem><para>Provide pad templates</para></listitem>
* <listitem><para>
* Provide source pad caps before pushing the first buffer
* </para></listitem>
* <listitem><para>
* Accept data in @handle_frame and provide encoded results to
* @gst_base_video_encoder_finish_frame.
* </para></listitem>
* </itemizedlist>
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstbasevideoencoder.h"
#include "gstbasevideoutils.h"
#include <string.h>
GST_DEBUG_CATEGORY (basevideoencoder_debug);
#define GST_CAT_DEFAULT basevideoencoder_debug
static void gst_base_video_encoder_finalize (GObject * object);
static GstCaps *gst_base_video_encoder_sink_getcaps (GstPad * pad,
GstCaps * filter);
static gboolean gst_base_video_encoder_src_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_base_video_encoder_sink_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_base_video_encoder_sink_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static GstFlowReturn gst_base_video_encoder_chain (GstPad * pad,
GstObject * parent, GstBuffer * buf);
static GstStateChangeReturn gst_base_video_encoder_change_state (GstElement *
element, GstStateChange transition);
static gboolean gst_base_video_encoder_src_query (GstPad * pad,
GstObject * parent, GstQuery * query);
#define gst_base_video_encoder_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstBaseVideoEncoder, gst_base_video_encoder,
GST_TYPE_BASE_VIDEO_CODEC, G_IMPLEMENT_INTERFACE (GST_TYPE_PRESET, NULL););
static void
gst_base_video_encoder_class_init (GstBaseVideoEncoderClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GST_DEBUG_CATEGORY_INIT (basevideoencoder_debug, "basevideoencoder", 0,
"Base Video Encoder");
gobject_class = G_OBJECT_CLASS (klass);
gstelement_class = GST_ELEMENT_CLASS (klass);
gobject_class->finalize = gst_base_video_encoder_finalize;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_base_video_encoder_change_state);
}
static void
gst_base_video_encoder_reset (GstBaseVideoEncoder * base_video_encoder)
{
GST_BASE_VIDEO_CODEC_STREAM_LOCK (base_video_encoder);
base_video_encoder->presentation_frame_number = 0;
base_video_encoder->distance_from_sync = 0;
base_video_encoder->force_keyframe = FALSE;
base_video_encoder->drained = TRUE;
base_video_encoder->min_latency = 0;
base_video_encoder->max_latency = 0;
if (base_video_encoder->force_keyunit_event) {
gst_event_unref (base_video_encoder->force_keyunit_event);
base_video_encoder->force_keyunit_event = NULL;
}
g_list_foreach (base_video_encoder->current_frame_events,
(GFunc) gst_event_unref, NULL);
g_list_free (base_video_encoder->current_frame_events);
base_video_encoder->current_frame_events = NULL;
GST_BASE_VIDEO_CODEC_STREAM_UNLOCK (base_video_encoder);
}
static void
gst_base_video_encoder_init (GstBaseVideoEncoder * base_video_encoder)
{
GstPad *pad;
GST_DEBUG_OBJECT (base_video_encoder, "gst_base_video_encoder_init");
pad = GST_BASE_VIDEO_CODEC_SINK_PAD (base_video_encoder);
gst_pad_set_chain_function (pad,
GST_DEBUG_FUNCPTR (gst_base_video_encoder_chain));
gst_pad_set_event_function (pad,
GST_DEBUG_FUNCPTR (gst_base_video_encoder_sink_event));
gst_pad_set_query_function (pad,
GST_DEBUG_FUNCPTR (gst_base_video_encoder_sink_query));
pad = GST_BASE_VIDEO_CODEC_SRC_PAD (base_video_encoder);
gst_pad_set_query_function (pad,
GST_DEBUG_FUNCPTR (gst_base_video_encoder_src_query));
gst_pad_set_event_function (pad,
GST_DEBUG_FUNCPTR (gst_base_video_encoder_src_event));
base_video_encoder->a.at_eos = FALSE;
/* encoder is expected to do so */
base_video_encoder->sink_clipping = TRUE;
}
static gboolean
gst_base_video_encoder_drain (GstBaseVideoEncoder * enc)
{
GstBaseVideoCodec *codec;
GstBaseVideoEncoderClass *enc_class;
gboolean ret = TRUE;
codec = GST_BASE_VIDEO_CODEC (enc);
enc_class = GST_BASE_VIDEO_ENCODER_GET_CLASS (enc);
GST_DEBUG_OBJECT (enc, "draining");
if (enc->drained) {
GST_DEBUG_OBJECT (enc, "already drained");
return TRUE;
}
if (enc_class->reset) {
GST_DEBUG_OBJECT (enc, "requesting subclass to finish");
ret = enc_class->reset (enc);
}
/* everything should be away now */
if (codec->frames) {
/* not fatal/impossible though if subclass/codec eats stuff */
GST_WARNING_OBJECT (enc, "still %d frames left after draining",
g_list_length (codec->frames));
#if 0
/* FIXME should do this, but subclass may come up with it later on ?
* and would then need refcounting or so on frames */
g_list_foreach (codec->frames,
(GFunc) gst_base_video_codec_free_frame, NULL);
#endif
}
return ret;
}
static gboolean
gst_base_video_encoder_sink_setcaps (GstBaseVideoEncoder * base_video_encoder,
GstCaps * caps)
{
GstBaseVideoEncoderClass *base_video_encoder_class;
GstBaseVideoCodec *codec = GST_BASE_VIDEO_CODEC (base_video_encoder);
GstVideoInfo *info, tmp_info;
GstVideoState *state, tmp_state;
gboolean ret = FALSE;
gboolean changed = TRUE;
GST_DEBUG_OBJECT (base_video_encoder, "setcaps %" GST_PTR_FORMAT, caps);
base_video_encoder_class =
GST_BASE_VIDEO_ENCODER_GET_CLASS (base_video_encoder);
/* subclass should do something here ... */
g_return_val_if_fail (base_video_encoder_class->set_format != NULL, FALSE);
GST_BASE_VIDEO_CODEC_STREAM_LOCK (base_video_encoder);
/* Get GstVideoInfo from upstream caps */
info = &codec->info;
if (!gst_video_info_from_caps (&tmp_info, caps))
goto exit;
state = &codec->state;
memset (&tmp_state, 0, sizeof (tmp_state));
tmp_state.caps = gst_caps_ref (caps);
/* Check if input caps changed */
if (info->finfo) {
/* Check if anything changed */
changed = GST_VIDEO_INFO_FORMAT (&tmp_info) != GST_VIDEO_INFO_FORMAT (info);
changed |= GST_VIDEO_INFO_FLAGS (&tmp_info) != GST_VIDEO_INFO_FLAGS (info);
changed |= GST_VIDEO_INFO_WIDTH (&tmp_info) != GST_VIDEO_INFO_WIDTH (info);
changed |=
GST_VIDEO_INFO_HEIGHT (&tmp_info) != GST_VIDEO_INFO_HEIGHT (info);
changed |= GST_VIDEO_INFO_SIZE (&tmp_info) != GST_VIDEO_INFO_SIZE (info);
changed |= GST_VIDEO_INFO_VIEWS (&tmp_info) != GST_VIDEO_INFO_VIEWS (info);
changed |= GST_VIDEO_INFO_FPS_N (&tmp_info) != GST_VIDEO_INFO_FPS_N (info);
changed |= GST_VIDEO_INFO_FPS_D (&tmp_info) != GST_VIDEO_INFO_FPS_D (info);
changed |= GST_VIDEO_INFO_PAR_N (&tmp_info) != GST_VIDEO_INFO_PAR_N (info);
changed |= GST_VIDEO_INFO_PAR_D (&tmp_info) != GST_VIDEO_INFO_PAR_D (info);
}
/* Copy over info from input GstVideoInfo into output GstVideoFrameState */
tmp_state.format = GST_VIDEO_INFO_FORMAT (&tmp_info);
tmp_state.bytes_per_picture = tmp_info.size;
tmp_state.width = tmp_info.width;
tmp_state.height = tmp_info.height;
tmp_state.fps_n = tmp_info.fps_n;
tmp_state.fps_d = tmp_info.fps_d;
tmp_state.par_n = tmp_info.par_n;
tmp_state.par_d = tmp_info.par_d;
tmp_state.clean_width = tmp_info.width;
tmp_state.clean_height = tmp_info.height;
tmp_state.clean_offset_left = 0;
tmp_state.clean_offset_top = 0;
/* FIXME (Edward): We need flags in GstVideoInfo to know whether
* interlaced field was present in input caps */
tmp_state.have_interlaced = tmp_state.interlaced =
GST_VIDEO_INFO_FLAG_IS_SET (&tmp_info, GST_VIDEO_FLAG_INTERLACED);
tmp_state.top_field_first =
GST_VIDEO_INFO_FLAG_IS_SET (&tmp_info, GST_VIDEO_FLAG_TFF);
if (changed) {
/* arrange draining pending frames */
gst_base_video_encoder_drain (base_video_encoder);
/* and subclass should be ready to configure format at any time around */
if (base_video_encoder_class->set_format)
ret =
base_video_encoder_class->set_format (base_video_encoder, &tmp_info);
if (ret) {
gst_caps_replace (&state->caps, NULL);
*state = tmp_state;
*info = tmp_info;
}
} else {
/* no need to stir things up */
GST_DEBUG_OBJECT (base_video_encoder,
"new video format identical to configured format");
gst_caps_unref (tmp_state.caps);
ret = TRUE;
}
exit:
GST_BASE_VIDEO_CODEC_STREAM_UNLOCK (base_video_encoder);
if (!ret) {
GST_WARNING_OBJECT (base_video_encoder, "rejected caps %" GST_PTR_FORMAT,
caps);
}
return ret;
}
static GstCaps *
gst_base_video_encoder_sink_getcaps (GstPad * pad, GstCaps * filter)
{
GstBaseVideoEncoder *base_video_encoder;
const GstCaps *templ_caps;
GstCaps *allowed;
GstCaps *fcaps, *filter_caps;
gint i, j;
base_video_encoder = GST_BASE_VIDEO_ENCODER (gst_pad_get_parent (pad));
/* FIXME: Allow subclass to override this? */
/* Allow downstream to specify width/height/framerate/PAR constraints
* and forward them upstream for video converters to handle
*/
templ_caps =
gst_pad_get_pad_template_caps (GST_BASE_VIDEO_CODEC_SINK_PAD
(base_video_encoder));
allowed =
gst_pad_get_allowed_caps (GST_BASE_VIDEO_CODEC_SRC_PAD
(base_video_encoder));
if (!allowed || gst_caps_is_empty (allowed) || gst_caps_is_any (allowed)) {
fcaps = gst_caps_copy (templ_caps);
goto done;
}
GST_LOG_OBJECT (base_video_encoder, "template caps %" GST_PTR_FORMAT,
templ_caps);
GST_LOG_OBJECT (base_video_encoder, "allowed caps %" GST_PTR_FORMAT, allowed);
filter_caps = gst_caps_new_empty ();
for (i = 0; i < gst_caps_get_size (templ_caps); i++) {
GQuark q_name =
gst_structure_get_name_id (gst_caps_get_structure (templ_caps, i));
for (j = 0; j < gst_caps_get_size (allowed); j++) {
const GstStructure *allowed_s = gst_caps_get_structure (allowed, j);
const GValue *val;
GstStructure *s;
s = gst_structure_new_id_empty (q_name);
if ((val = gst_structure_get_value (allowed_s, "width")))
gst_structure_set_value (s, "width", val);
if ((val = gst_structure_get_value (allowed_s, "height")))
gst_structure_set_value (s, "height", val);
if ((val = gst_structure_get_value (allowed_s, "framerate")))
gst_structure_set_value (s, "framerate", val);
if ((val = gst_structure_get_value (allowed_s, "pixel-aspect-ratio")))
gst_structure_set_value (s, "pixel-aspect-ratio", val);
gst_caps_merge_structure (filter_caps, s);
}
}
GST_LOG_OBJECT (base_video_encoder, "filtered caps (first) %" GST_PTR_FORMAT,
filter_caps);
fcaps = gst_caps_intersect (filter_caps, templ_caps);
gst_caps_unref (filter_caps);
if (filter) {
GST_LOG_OBJECT (base_video_encoder, "intersecting with %" GST_PTR_FORMAT,
filter);
filter_caps = gst_caps_intersect (fcaps, filter);
gst_caps_unref (fcaps);
fcaps = filter_caps;
}
done:
gst_caps_replace (&allowed, NULL);
GST_LOG_OBJECT (base_video_encoder, "Returning caps %" GST_PTR_FORMAT, fcaps);
g_object_unref (base_video_encoder);
return fcaps;
}
static gboolean
gst_base_video_encoder_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_base_video_encoder_sink_getcaps (pad, filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
break;
}
default:
res = gst_pad_query_default (pad, parent, query);
break;
}
return res;
}
static void
gst_base_video_encoder_finalize (GObject * object)
{
GST_DEBUG_OBJECT (object, "finalize");
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_base_video_encoder_sink_eventfunc (GstBaseVideoEncoder * base_video_encoder,
GstEvent * event)
{
GstBaseVideoEncoderClass *base_video_encoder_class;
gboolean ret = FALSE;
base_video_encoder_class =
GST_BASE_VIDEO_ENCODER_GET_CLASS (base_video_encoder);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_base_video_encoder_sink_setcaps (base_video_encoder, caps);
gst_event_unref (event);
}
break;
case GST_EVENT_EOS:
{
GstFlowReturn flow_ret;
GST_BASE_VIDEO_CODEC_STREAM_LOCK (base_video_encoder);
base_video_encoder->a.at_eos = TRUE;
if (base_video_encoder_class->finish) {
flow_ret = base_video_encoder_class->finish (base_video_encoder);
} else {
flow_ret = GST_FLOW_OK;
}
ret = (flow_ret == GST_BASE_VIDEO_ENCODER_FLOW_DROPPED);
GST_BASE_VIDEO_CODEC_STREAM_UNLOCK (base_video_encoder);
break;
}
case GST_EVENT_SEGMENT:
{
const GstSegment *segment;
GST_BASE_VIDEO_CODEC_STREAM_LOCK (base_video_encoder);
gst_event_parse_segment (event, &segment);
GST_DEBUG_OBJECT (base_video_encoder, "newseg rate %g, applied rate %g, "
"format %d, start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
", pos = %" GST_TIME_FORMAT, segment->rate, segment->applied_rate,
segment->format, GST_TIME_ARGS (segment->start),
GST_TIME_ARGS (segment->stop), GST_TIME_ARGS (segment->position));
if (segment->format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (base_video_encoder, "received non TIME newsegment");
GST_BASE_VIDEO_CODEC_STREAM_UNLOCK (base_video_encoder);
break;
}
base_video_encoder->a.at_eos = FALSE;
gst_segment_copy_into (segment, &GST_BASE_VIDEO_CODEC
(base_video_encoder)->segment);
GST_BASE_VIDEO_CODEC_STREAM_UNLOCK (base_video_encoder);
break;
}
case GST_EVENT_CUSTOM_DOWNSTREAM:
{
const GstStructure *s;
s = gst_event_get_structure (event);
if (gst_structure_has_name (s, "GstForceKeyUnit")) {
GST_OBJECT_LOCK (base_video_encoder);
base_video_encoder->force_keyframe = TRUE;
if (base_video_encoder->force_keyunit_event)
gst_event_unref (base_video_encoder->force_keyunit_event);
base_video_encoder->force_keyunit_event = gst_event_copy (event);
GST_OBJECT_UNLOCK (base_video_encoder);
gst_event_unref (event);
ret = TRUE;
}
break;
}
default:
break;
}
return ret;
}
static gboolean
gst_base_video_encoder_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstBaseVideoEncoder *enc;
GstBaseVideoEncoderClass *klass;
gboolean handled = FALSE;
gboolean ret = TRUE;
enc = GST_BASE_VIDEO_ENCODER (parent);
klass = GST_BASE_VIDEO_ENCODER_GET_CLASS (enc);
GST_DEBUG_OBJECT (enc, "received event %d, %s", GST_EVENT_TYPE (event),
GST_EVENT_TYPE_NAME (event));
if (klass->event)
handled = klass->event (enc, event);
if (!handled)
handled = gst_base_video_encoder_sink_eventfunc (enc, event);
if (!handled) {
/* Forward non-serialized events and EOS/FLUSH_STOP immediately.
* For EOS this is required because no buffer or serialized event
* will come after EOS and nothing could trigger another
* _finish_frame() call. *
* If the subclass handles sending of EOS manually it can return
* _DROPPED from ::finish() and all other subclasses should have
* decoded/flushed all remaining data before this
*
* For FLUSH_STOP this is required because it is expected
* to be forwarded immediately and no buffers are queued anyway.
*/
if (!GST_EVENT_IS_SERIALIZED (event)
|| GST_EVENT_TYPE (event) == GST_EVENT_EOS
|| GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_STOP) {
ret = gst_pad_push_event (enc->base_video_codec.srcpad, event);
} else {
GST_BASE_VIDEO_CODEC_STREAM_LOCK (enc);
enc->current_frame_events =
g_list_prepend (enc->current_frame_events, event);
GST_BASE_VIDEO_CODEC_STREAM_UNLOCK (enc);
}
}
GST_DEBUG_OBJECT (enc, "event handled");
return ret;
}
static gboolean
gst_base_video_encoder_src_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstBaseVideoEncoder *base_video_encoder;
gboolean ret = FALSE;
base_video_encoder = GST_BASE_VIDEO_ENCODER (parent);
GST_LOG_OBJECT (base_video_encoder, "handling event: %" GST_PTR_FORMAT,
event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CUSTOM_UPSTREAM:
{
const GstStructure *s;
s = gst_event_get_structure (event);
if (gst_structure_has_name (s, "GstForceKeyUnit")) {
GST_OBJECT_LOCK (base_video_encoder);
base_video_encoder->force_keyframe = TRUE;
GST_OBJECT_UNLOCK (base_video_encoder);
gst_event_unref (event);
ret = TRUE;
} else {
ret =
gst_pad_push_event (GST_BASE_VIDEO_CODEC_SINK_PAD
(base_video_encoder), event);
}
break;
}
default:
ret =
gst_pad_push_event (GST_BASE_VIDEO_CODEC_SINK_PAD
(base_video_encoder), event);
break;
}
return ret;
}
static gboolean
gst_base_video_encoder_src_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
GstBaseVideoEncoder *enc;
gboolean res;
enc = GST_BASE_VIDEO_ENCODER (parent);
GST_LOG_OBJECT (enc, "handling query: %" GST_PTR_FORMAT, query);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONVERT:
{
GstBaseVideoCodec *codec = GST_BASE_VIDEO_CODEC (enc);
GstFormat src_fmt, dest_fmt;
gint64 src_val, dest_val;
gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
res = gst_base_video_encoded_video_convert (&codec->state,
codec->bytes, codec->time, src_fmt, src_val, &dest_fmt, &dest_val);
if (!res)
goto error;
gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
break;
}
case GST_QUERY_LATENCY:
{
gboolean live;
GstClockTime min_latency, max_latency;
res = gst_pad_peer_query (GST_BASE_VIDEO_CODEC_SINK_PAD (enc), query);
if (res) {
gst_query_parse_latency (query, &live, &min_latency, &max_latency);
GST_DEBUG_OBJECT (enc, "Peer latency: live %d, min %"
GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
GST_OBJECT_LOCK (enc);
min_latency += enc->min_latency;
if (max_latency != GST_CLOCK_TIME_NONE) {
max_latency += enc->max_latency;
}
GST_OBJECT_UNLOCK (enc);
gst_query_set_latency (query, live, min_latency, max_latency);
}
}
break;
default:
res = gst_pad_query_default (pad, parent, query);
}
return res;
/* ERRORS */
error:
{
GST_DEBUG_OBJECT (enc, "query failed");
return res;
}
}
static GstFlowReturn
gst_base_video_encoder_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstBaseVideoEncoder *base_video_encoder;
GstBaseVideoEncoderClass *klass;
GstVideoFrameState *frame;
GstFlowReturn ret = GST_FLOW_OK;
base_video_encoder = GST_BASE_VIDEO_ENCODER (parent);
klass = GST_BASE_VIDEO_ENCODER_GET_CLASS (base_video_encoder);
g_return_val_if_fail (klass->handle_frame != NULL, GST_FLOW_ERROR);
GST_BASE_VIDEO_CODEC_STREAM_LOCK (base_video_encoder);
GST_LOG_OBJECT (base_video_encoder,
"received buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buf),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buf)));
if (base_video_encoder->a.at_eos) {
ret = GST_FLOW_UNEXPECTED;
goto done;
}
if (base_video_encoder->sink_clipping) {
guint64 start = GST_BUFFER_TIMESTAMP (buf);
guint64 stop = start + GST_BUFFER_DURATION (buf);
guint64 clip_start;
guint64 clip_stop;
if (!gst_segment_clip (&GST_BASE_VIDEO_CODEC (base_video_encoder)->segment,
GST_FORMAT_TIME, start, stop, &clip_start, &clip_stop)) {
GST_DEBUG_OBJECT (base_video_encoder,
"clipping to segment dropped frame");
goto done;
}
}
if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DISCONT))) {
GST_LOG_OBJECT (base_video_encoder, "marked discont");
GST_BASE_VIDEO_CODEC (base_video_encoder)->discont = TRUE;
}
frame =
gst_base_video_codec_new_frame (GST_BASE_VIDEO_CODEC
(base_video_encoder));
frame->events = base_video_encoder->current_frame_events;
base_video_encoder->current_frame_events = NULL;
frame->sink_buffer = buf;
frame->presentation_timestamp = GST_BUFFER_TIMESTAMP (buf);
frame->presentation_duration = GST_BUFFER_DURATION (buf);
frame->presentation_frame_number =
base_video_encoder->presentation_frame_number;
base_video_encoder->presentation_frame_number++;
frame->force_keyframe = base_video_encoder->force_keyframe;
base_video_encoder->force_keyframe = FALSE;
GST_BASE_VIDEO_CODEC (base_video_encoder)->frames =
g_list_append (GST_BASE_VIDEO_CODEC (base_video_encoder)->frames, frame);
/* new data, more finish needed */
base_video_encoder->drained = FALSE;
GST_LOG_OBJECT (base_video_encoder, "passing frame pfn %d to subclass",
frame->presentation_frame_number);
ret = klass->handle_frame (base_video_encoder, frame);
done:
GST_BASE_VIDEO_CODEC_STREAM_UNLOCK (base_video_encoder);
return ret;
}
static GstStateChangeReturn
gst_base_video_encoder_change_state (GstElement * element,
GstStateChange transition)
{
GstBaseVideoEncoder *base_video_encoder;
GstBaseVideoEncoderClass *base_video_encoder_class;
GstStateChangeReturn ret;
base_video_encoder = GST_BASE_VIDEO_ENCODER (element);
base_video_encoder_class = GST_BASE_VIDEO_ENCODER_GET_CLASS (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_base_video_encoder_reset (base_video_encoder);
if (base_video_encoder_class->start) {
if (!base_video_encoder_class->start (base_video_encoder))
goto start_error;
}
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_base_video_encoder_reset (base_video_encoder);
if (base_video_encoder_class->stop) {
if (!base_video_encoder_class->stop (base_video_encoder))
goto stop_error;
}
break;
default:
break;
}
return ret;
start_error:
GST_WARNING_OBJECT (base_video_encoder, "failed to start");
return GST_STATE_CHANGE_FAILURE;
stop_error:
GST_WARNING_OBJECT (base_video_encoder, "failed to stop");
return GST_STATE_CHANGE_FAILURE;
}
/**
* gst_base_video_encoder_finish_frame:
* @base_video_encoder: a #GstBaseVideoEncoder
* @frame: an encoded #GstVideoFrameState
*
* @frame must have a valid encoded data buffer, whose metadata fields
* are then appropriately set according to frame data or no buffer at
* all if the frame should be dropped.
* It is subsequently pushed downstream or provided to @shape_output.
* In any case, the frame is considered finished and released.
*
* Returns: a #GstFlowReturn resulting from sending data downstream
*/
GstFlowReturn
gst_base_video_encoder_finish_frame (GstBaseVideoEncoder * base_video_encoder,
GstVideoFrameState * frame)
{
GstFlowReturn ret = GST_FLOW_OK;
GstBaseVideoEncoderClass *base_video_encoder_class;
GList *l;
base_video_encoder_class =
GST_BASE_VIDEO_ENCODER_GET_CLASS (base_video_encoder);
GST_LOG_OBJECT (base_video_encoder,
"finish frame fpn %d", frame->presentation_frame_number);
GST_BASE_VIDEO_CODEC_STREAM_LOCK (base_video_encoder);
/* Push all pending events that arrived before this frame */
for (l = base_video_encoder->base_video_codec.frames; l; l = l->next) {
GstVideoFrameState *tmp = l->data;
if (tmp->events) {
GList *k;
for (k = g_list_last (tmp->events); k; k = k->prev)
gst_pad_push_event (GST_BASE_VIDEO_CODEC_SRC_PAD (base_video_encoder),
k->data);
g_list_free (tmp->events);
tmp->events = NULL;
}
if (tmp == frame)
break;
}
if (frame->force_keyframe) {
GstClockTime stream_time;
GstClockTime running_time;
GstEvent *ev;
running_time =
gst_segment_to_running_time (&GST_BASE_VIDEO_CODEC
(base_video_encoder)->segment, GST_FORMAT_TIME,
frame->presentation_timestamp);
stream_time =
gst_segment_to_stream_time (&GST_BASE_VIDEO_CODEC
(base_video_encoder)->segment, GST_FORMAT_TIME,
frame->presentation_timestamp);
/* re-use upstream event if any so it also conveys any additional
* info upstream arranged in there */
GST_OBJECT_LOCK (base_video_encoder);
if (base_video_encoder->force_keyunit_event) {
ev = base_video_encoder->force_keyunit_event;
base_video_encoder->force_keyunit_event = NULL;
} else {
ev = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM,
gst_structure_new_empty ("GstForceKeyUnit"));
}
GST_OBJECT_UNLOCK (base_video_encoder);
gst_structure_set (gst_event_writable_structure (ev),
"timestamp", G_TYPE_UINT64, frame->presentation_timestamp,
"stream-time", G_TYPE_UINT64, stream_time,
"running-time", G_TYPE_UINT64, running_time, NULL);
gst_pad_push_event (GST_BASE_VIDEO_CODEC_SRC_PAD (base_video_encoder), ev);
}
/* no buffer data means this frame is skipped/dropped */
if (!frame->src_buffer) {
GST_DEBUG_OBJECT (base_video_encoder, "skipping frame %" GST_TIME_FORMAT,
GST_TIME_ARGS (frame->presentation_timestamp));
goto done;
}
if (frame->is_sync_point) {
GST_LOG_OBJECT (base_video_encoder, "key frame");
base_video_encoder->distance_from_sync = 0;
GST_BUFFER_FLAG_UNSET (frame->src_buffer, GST_BUFFER_FLAG_DELTA_UNIT);
} else {
GST_BUFFER_FLAG_SET (frame->src_buffer, GST_BUFFER_FLAG_DELTA_UNIT);
}
frame->distance_from_sync = base_video_encoder->distance_from_sync;
base_video_encoder->distance_from_sync++;
frame->decode_frame_number = frame->system_frame_number - 1;
if (frame->decode_frame_number < 0) {
frame->decode_timestamp = 0;
} else {
frame->decode_timestamp = gst_util_uint64_scale (frame->decode_frame_number,
GST_SECOND * GST_BASE_VIDEO_CODEC (base_video_encoder)->state.fps_d,
GST_BASE_VIDEO_CODEC (base_video_encoder)->state.fps_n);
}
GST_BUFFER_TIMESTAMP (frame->src_buffer) = frame->presentation_timestamp;
GST_BUFFER_DURATION (frame->src_buffer) = frame->presentation_duration;
GST_BUFFER_OFFSET (frame->src_buffer) = frame->decode_timestamp;
/* update rate estimate */
GST_BASE_VIDEO_CODEC (base_video_encoder)->bytes +=
gst_buffer_get_size (frame->src_buffer);
if (GST_CLOCK_TIME_IS_VALID (frame->presentation_duration)) {
GST_BASE_VIDEO_CODEC (base_video_encoder)->time +=
frame->presentation_duration;
} else {
/* better none than nothing valid */
GST_BASE_VIDEO_CODEC (base_video_encoder)->time = GST_CLOCK_TIME_NONE;
}
if (G_UNLIKELY (GST_BASE_VIDEO_CODEC (base_video_encoder)->discont)) {
GST_LOG_OBJECT (base_video_encoder, "marking discont");
GST_BUFFER_FLAG_SET (frame->src_buffer, GST_BUFFER_FLAG_DISCONT);
GST_BASE_VIDEO_CODEC (base_video_encoder)->discont = FALSE;
}
if (base_video_encoder_class->shape_output) {
ret = base_video_encoder_class->shape_output (base_video_encoder, frame);
} else {
ret =
gst_pad_push (GST_BASE_VIDEO_CODEC_SRC_PAD (base_video_encoder),
frame->src_buffer);
}
frame->src_buffer = NULL;
done:
/* handed out */
GST_BASE_VIDEO_CODEC (base_video_encoder)->frames =
g_list_remove (GST_BASE_VIDEO_CODEC (base_video_encoder)->frames, frame);
gst_base_video_codec_free_frame (frame);
GST_BASE_VIDEO_CODEC_STREAM_UNLOCK (base_video_encoder);
return ret;
}
/**
* gst_base_video_encoder_get_state:
* @base_video_encoder: a #GstBaseVideoEncoder
*
* Returns: #GstVideoState describing format of video data.
*/
const GstVideoState *
gst_base_video_encoder_get_state (GstBaseVideoEncoder * base_video_encoder)
{
return &GST_BASE_VIDEO_CODEC (base_video_encoder)->state;
}
/**
* gst_base_video_encoder_set_latency:
* @base_video_encoder: a #GstBaseVideoEncoder
* @min_latency: minimum latency
* @max_latency: maximum latency
*
* Informs baseclass of encoding latency.
*/
void
gst_base_video_encoder_set_latency (GstBaseVideoEncoder * base_video_encoder,
GstClockTime min_latency, GstClockTime max_latency)
{
g_return_if_fail (min_latency >= 0);
g_return_if_fail (max_latency >= min_latency);
GST_OBJECT_LOCK (base_video_encoder);
base_video_encoder->min_latency = min_latency;
base_video_encoder->max_latency = max_latency;
GST_OBJECT_UNLOCK (base_video_encoder);
gst_element_post_message (GST_ELEMENT_CAST (base_video_encoder),
gst_message_new_latency (GST_OBJECT_CAST (base_video_encoder)));
}
/**
* gst_base_video_encoder_set_latency_fields:
* @base_video_encoder: a #GstBaseVideoEncoder
* @fields: latency in fields
*
* Informs baseclass of encoding latency in terms of fields (both min
* and max latency).
*/
void
gst_base_video_encoder_set_latency_fields (GstBaseVideoEncoder *
base_video_encoder, int n_fields)
{
gint64 latency;
/* 0 numerator is used for "don't know" */
if (GST_BASE_VIDEO_CODEC (base_video_encoder)->state.fps_n == 0)
return;
latency = gst_util_uint64_scale (n_fields,
GST_BASE_VIDEO_CODEC (base_video_encoder)->state.fps_d * GST_SECOND,
2 * GST_BASE_VIDEO_CODEC (base_video_encoder)->state.fps_n);
gst_base_video_encoder_set_latency (base_video_encoder, latency, latency);
}
/**
* gst_base_video_encoder_get_oldest_frame:
* @base_video_encoder: a #GstBaseVideoEncoder
*
* Returns: oldest unfinished pending #GstVideoFrameState
*/
GstVideoFrameState *
gst_base_video_encoder_get_oldest_frame (GstBaseVideoEncoder *
base_video_encoder)
{
GList *g;
GST_BASE_VIDEO_CODEC_STREAM_LOCK (base_video_encoder);
g = g_list_first (GST_BASE_VIDEO_CODEC (base_video_encoder)->frames);
GST_BASE_VIDEO_CODEC_STREAM_UNLOCK (base_video_encoder);
if (g == NULL)
return NULL;
return (GstVideoFrameState *) (g->data);
}
/* FIXME there could probably be more of these;
* get by presentation_number, by presentation_time ? */
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