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gstreamer/gst-libs/gst/video/gstvideoencoder.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>
* Copyright (C) 2012 Collabora Ltd.
* Author : Edward Hervey <edward@collabora.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstvideoencoder
* @short_description: Base class for video encoders
* @see_also:
*
* This base class is for video encoders turning raw video into
* encoded video data.
*
* GstVideoEncoder and subclass should cooperate as follows.
* <orderedlist>
* <listitem>
* <itemizedlist><title>Configuration</title>
* <listitem><para>
* Initially, GstVideoEncoder calls @start when the encoder element
* is activated, which allows subclass to perform any global setup.
* </para></listitem>
* <listitem><para>
* GstVideoEncoder 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>
* GstVideoEncoder 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_video_encoder_finish_frame to have encoded data pushed
* downstream.
* </para></listitem>
* <listitem><para>
* If implemented, baseclass calls subclass @pre_push just prior to
* pushing to allow subclasses to modify some metadata on the buffer.
* If it returns GST_FLOW_OK, the buffer is pushed downstream.
* </para></listitem>
* <listitem><para>
* GstVideoEncoderClass 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>
* GstVideoEncoder 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_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_video_encoder_finish_frame.
* </para></listitem>
* </itemizedlist>
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/* TODO
*
* * Calculate actual latency based on input/output timestamp/frame_number
* and if it exceeds the recorded one, save it and emit a GST_MESSAGE_LATENCY
*/
#include <gst/video/video.h>
#include "gstvideoencoder.h"
#include "gstvideoutils.h"
#include <gst/video/gstvideometa.h>
#include <gst/video/gstvideopool.h>
#include <string.h>
GST_DEBUG_CATEGORY (videoencoder_debug);
#define GST_CAT_DEFAULT videoencoder_debug
#define GST_VIDEO_ENCODER_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_VIDEO_ENCODER, \
GstVideoEncoderPrivate))
struct _GstVideoEncoderPrivate
{
guint64 presentation_frame_number;
int distance_from_sync;
/* FIXME : (and introduce a context ?) */
gboolean drained;
gboolean at_eos;
gboolean do_caps;
gint64 min_latency;
gint64 max_latency;
GList *current_frame_events;
GList *headers;
gboolean new_headers; /* Whether new headers were just set */
GList *force_key_unit; /* List of pending forced keyunits */
guint32 system_frame_number;
GList *frames; /* Protected with OBJECT_LOCK */
GstVideoCodecState *input_state;
GstVideoCodecState *output_state;
gboolean output_state_changed;
gint64 bytes;
gint64 time;
GstAllocator *allocator;
GstAllocationParams params;
GstTagList *tags;
gboolean tags_changed;
};
typedef struct _ForcedKeyUnitEvent ForcedKeyUnitEvent;
struct _ForcedKeyUnitEvent
{
GstClockTime running_time;
gboolean pending; /* TRUE if this was requested already */
gboolean all_headers;
guint count;
};
static void
forced_key_unit_event_free (ForcedKeyUnitEvent * evt)
{
g_slice_free (ForcedKeyUnitEvent, evt);
}
static ForcedKeyUnitEvent *
forced_key_unit_event_new (GstClockTime running_time, gboolean all_headers,
guint count)
{
ForcedKeyUnitEvent *evt = g_slice_new0 (ForcedKeyUnitEvent);
evt->running_time = running_time;
evt->all_headers = all_headers;
evt->count = count;
return evt;
}
static GstElementClass *parent_class = NULL;
static void gst_video_encoder_class_init (GstVideoEncoderClass * klass);
static void gst_video_encoder_init (GstVideoEncoder * enc,
GstVideoEncoderClass * klass);
static void gst_video_encoder_finalize (GObject * object);
static gboolean gst_video_encoder_setcaps (GstVideoEncoder * enc,
GstCaps * caps);
static GstCaps *gst_video_encoder_sink_getcaps (GstVideoEncoder * encoder,
GstCaps * filter);
static gboolean gst_video_encoder_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_video_encoder_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstFlowReturn gst_video_encoder_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static GstStateChangeReturn gst_video_encoder_change_state (GstElement *
element, GstStateChange transition);
static gboolean gst_video_encoder_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static gboolean gst_video_encoder_src_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static GstVideoCodecFrame *gst_video_encoder_new_frame (GstVideoEncoder *
encoder, GstBuffer * buf, GstClockTime pts, GstClockTime dts,
GstClockTime duration);
static gboolean gst_video_encoder_sink_event_default (GstVideoEncoder * encoder,
GstEvent * event);
static gboolean gst_video_encoder_src_event_default (GstVideoEncoder * encoder,
GstEvent * event);
static gboolean gst_video_encoder_decide_allocation_default (GstVideoEncoder *
encoder, GstQuery * query);
static gboolean gst_video_encoder_propose_allocation_default (GstVideoEncoder *
encoder, GstQuery * query);
static gboolean gst_video_encoder_negotiate_default (GstVideoEncoder * encoder);
/* we can't use G_DEFINE_ABSTRACT_TYPE because we need the klass in the _init
* method to get to the padtemplates */
GType
gst_video_encoder_get_type (void)
{
static volatile gsize type = 0;
if (g_once_init_enter (&type)) {
GType _type;
static const GTypeInfo info = {
sizeof (GstVideoEncoderClass),
NULL,
NULL,
(GClassInitFunc) gst_video_encoder_class_init,
NULL,
NULL,
sizeof (GstVideoEncoder),
0,
(GInstanceInitFunc) gst_video_encoder_init,
};
const GInterfaceInfo preset_interface_info = {
NULL, /* interface_init */
NULL, /* interface_finalize */
NULL /* interface_data */
};
_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstVideoEncoder", &info, G_TYPE_FLAG_ABSTRACT);
g_type_add_interface_static (_type, GST_TYPE_PRESET,
&preset_interface_info);
g_once_init_leave (&type, _type);
}
return type;
}
static void
gst_video_encoder_class_init (GstVideoEncoderClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = G_OBJECT_CLASS (klass);
gstelement_class = GST_ELEMENT_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (videoencoder_debug, "videoencoder", 0,
"Base Video Encoder");
parent_class = g_type_class_peek_parent (klass);
g_type_class_add_private (klass, sizeof (GstVideoEncoderPrivate));
gobject_class->finalize = gst_video_encoder_finalize;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_video_encoder_change_state);
klass->sink_event = gst_video_encoder_sink_event_default;
klass->src_event = gst_video_encoder_src_event_default;
klass->propose_allocation = gst_video_encoder_propose_allocation_default;
klass->decide_allocation = gst_video_encoder_decide_allocation_default;
klass->negotiate = gst_video_encoder_negotiate_default;
}
static void
gst_video_encoder_reset (GstVideoEncoder * encoder)
{
GstVideoEncoderPrivate *priv = encoder->priv;
GList *g;
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
priv->presentation_frame_number = 0;
priv->distance_from_sync = 0;
g_list_foreach (priv->force_key_unit, (GFunc) forced_key_unit_event_free,
NULL);
g_list_free (priv->force_key_unit);
priv->force_key_unit = NULL;
priv->drained = TRUE;
priv->min_latency = 0;
priv->max_latency = 0;
g_list_foreach (priv->headers, (GFunc) gst_event_unref, NULL);
g_list_free (priv->headers);
priv->headers = NULL;
priv->new_headers = FALSE;
g_list_foreach (priv->current_frame_events, (GFunc) gst_event_unref, NULL);
g_list_free (priv->current_frame_events);
priv->current_frame_events = NULL;
for (g = priv->frames; g; g = g->next) {
gst_video_codec_frame_unref ((GstVideoCodecFrame *) g->data);
}
g_list_free (priv->frames);
priv->frames = NULL;
priv->bytes = 0;
priv->time = 0;
if (priv->input_state)
gst_video_codec_state_unref (priv->input_state);
priv->input_state = NULL;
if (priv->output_state)
gst_video_codec_state_unref (priv->output_state);
priv->output_state = NULL;
if (priv->tags)
gst_tag_list_unref (priv->tags);
priv->tags = NULL;
priv->tags_changed = FALSE;
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
}
static void
gst_video_encoder_init (GstVideoEncoder * encoder, GstVideoEncoderClass * klass)
{
GstVideoEncoderPrivate *priv;
GstPadTemplate *pad_template;
GstPad *pad;
GST_DEBUG_OBJECT (encoder, "gst_video_encoder_init");
priv = encoder->priv = GST_VIDEO_ENCODER_GET_PRIVATE (encoder);
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass), "sink");
g_return_if_fail (pad_template != NULL);
encoder->sinkpad = pad = gst_pad_new_from_template (pad_template, "sink");
gst_pad_set_chain_function (pad, GST_DEBUG_FUNCPTR (gst_video_encoder_chain));
gst_pad_set_event_function (pad,
GST_DEBUG_FUNCPTR (gst_video_encoder_sink_event));
gst_pad_set_query_function (pad,
GST_DEBUG_FUNCPTR (gst_video_encoder_sink_query));
gst_element_add_pad (GST_ELEMENT (encoder), encoder->sinkpad);
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass), "src");
g_return_if_fail (pad_template != NULL);
encoder->srcpad = pad = gst_pad_new_from_template (pad_template, "src");
gst_pad_set_query_function (pad,
GST_DEBUG_FUNCPTR (gst_video_encoder_src_query));
gst_pad_set_event_function (pad,
GST_DEBUG_FUNCPTR (gst_video_encoder_src_event));
gst_element_add_pad (GST_ELEMENT (encoder), encoder->srcpad);
gst_segment_init (&encoder->input_segment, GST_FORMAT_TIME);
gst_segment_init (&encoder->output_segment, GST_FORMAT_TIME);
g_rec_mutex_init (&encoder->stream_lock);
priv->at_eos = FALSE;
priv->headers = NULL;
priv->new_headers = FALSE;
gst_video_encoder_reset (encoder);
}
static gboolean
gst_video_encoded_video_convert (gint64 bytes, gint64 time,
GstFormat src_format, gint64 src_value, GstFormat * dest_format,
gint64 * dest_value)
{
gboolean res = FALSE;
g_return_val_if_fail (dest_format != NULL, FALSE);
g_return_val_if_fail (dest_value != NULL, FALSE);
if (G_UNLIKELY (src_format == *dest_format || src_value == 0 ||
src_value == -1)) {
if (dest_value)
*dest_value = src_value;
return TRUE;
}
if (bytes <= 0 || time <= 0) {
GST_DEBUG ("not enough metadata yet to convert");
goto exit;
}
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = gst_util_uint64_scale (src_value, time, bytes);
res = TRUE;
break;
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
*dest_value = gst_util_uint64_scale (src_value, bytes, time);
res = TRUE;
break;
default:
res = FALSE;
}
break;
default:
GST_DEBUG ("unhandled conversion from %d to %d", src_format,
*dest_format);
res = FALSE;
}
exit:
return res;
}
/**
* gst_video_encoder_set_headers:
* @encoder: a #GstVideoEncoder
* @headers: (transfer full) (element-type GstBuffer): a list of #GstBuffer containing the codec header
*
* Set the codec headers to be sent downstream whenever requested.
*/
void
gst_video_encoder_set_headers (GstVideoEncoder * video_encoder, GList * headers)
{
GST_VIDEO_ENCODER_STREAM_LOCK (video_encoder);
GST_DEBUG_OBJECT (video_encoder, "new headers %p", headers);
if (video_encoder->priv->headers) {
g_list_foreach (video_encoder->priv->headers, (GFunc) gst_buffer_unref,
NULL);
g_list_free (video_encoder->priv->headers);
}
video_encoder->priv->headers = headers;
video_encoder->priv->new_headers = TRUE;
GST_VIDEO_ENCODER_STREAM_UNLOCK (video_encoder);
}
static gboolean
gst_video_encoder_drain (GstVideoEncoder * enc)
{
GstVideoEncoderPrivate *priv;
GstVideoEncoderClass *enc_class;
gboolean ret = TRUE;
enc_class = GST_VIDEO_ENCODER_GET_CLASS (enc);
priv = enc->priv;
GST_DEBUG_OBJECT (enc, "draining");
if (priv->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, TRUE);
}
/* everything should be away now */
if (priv->frames) {
/* not fatal/impossible though if subclass/enc eats stuff */
g_list_foreach (priv->frames, (GFunc) gst_video_codec_frame_unref, NULL);
g_list_free (priv->frames);
priv->frames = NULL;
}
return ret;
}
static GstVideoCodecState *
_new_output_state (GstCaps * caps, GstVideoCodecState * reference)
{
GstVideoCodecState *state;
state = g_slice_new0 (GstVideoCodecState);
state->ref_count = 1;
gst_video_info_init (&state->info);
gst_video_info_set_format (&state->info, GST_VIDEO_FORMAT_ENCODED, 0, 0);
state->caps = caps;
if (reference) {
GstVideoInfo *tgt, *ref;
tgt = &state->info;
ref = &reference->info;
/* Copy over extra fields from reference state */
tgt->interlace_mode = ref->interlace_mode;
tgt->flags = ref->flags;
tgt->width = ref->width;
tgt->height = ref->height;
tgt->chroma_site = ref->chroma_site;
tgt->colorimetry = ref->colorimetry;
tgt->par_n = ref->par_n;
tgt->par_d = ref->par_d;
tgt->fps_n = ref->fps_n;
tgt->fps_d = ref->fps_d;
}
return state;
}
static GstVideoCodecState *
_new_input_state (GstCaps * caps)
{
GstVideoCodecState *state;
state = g_slice_new0 (GstVideoCodecState);
state->ref_count = 1;
gst_video_info_init (&state->info);
if (G_UNLIKELY (!gst_video_info_from_caps (&state->info, caps)))
goto parse_fail;
state->caps = gst_caps_ref (caps);
return state;
parse_fail:
{
g_slice_free (GstVideoCodecState, state);
return NULL;
}
}
static gboolean
gst_video_encoder_setcaps (GstVideoEncoder * encoder, GstCaps * caps)
{
GstVideoEncoderClass *encoder_class;
GstVideoCodecState *state;
gboolean ret;
gboolean samecaps = FALSE;
encoder_class = GST_VIDEO_ENCODER_GET_CLASS (encoder);
/* subclass should do something here ... */
g_return_val_if_fail (encoder_class->set_format != NULL, FALSE);
GST_DEBUG_OBJECT (encoder, "setcaps %" GST_PTR_FORMAT, caps);
state = _new_input_state (caps);
if (G_UNLIKELY (!state))
goto parse_fail;
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
if (encoder->priv->input_state)
samecaps =
gst_video_info_is_equal (&state->info,
&encoder->priv->input_state->info);
if (!samecaps) {
/* arrange draining pending frames */
gst_video_encoder_drain (encoder);
/* and subclass should be ready to configure format at any time around */
ret = encoder_class->set_format (encoder, state);
if (ret) {
if (encoder->priv->input_state)
gst_video_codec_state_unref (encoder->priv->input_state);
encoder->priv->input_state = state;
} else
gst_video_codec_state_unref (state);
} else {
/* no need to stir things up */
GST_DEBUG_OBJECT (encoder,
"new video format identical to configured format");
gst_video_codec_state_unref (state);
ret = TRUE;
}
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
if (!ret)
GST_WARNING_OBJECT (encoder, "rejected caps %" GST_PTR_FORMAT, caps);
return ret;
parse_fail:
{
GST_WARNING_OBJECT (encoder, "Failed to parse caps");
return FALSE;
}
}
/**
* gst_video_encoder_proxy_getcaps:
* @enc: a #GstVideoEncoder
* @caps: initial caps
* @filter: filter caps
*
* Returns caps that express @caps (or sink template caps if @caps == NULL)
* restricted to resolution/format/... combinations supported by downstream
* elements (e.g. muxers).
*
* Returns: a #GstCaps owned by caller
*/
GstCaps *
gst_video_encoder_proxy_getcaps (GstVideoEncoder * encoder, GstCaps * caps,
GstCaps * filter)
{
GstCaps *templ_caps;
GstCaps *allowed;
GstCaps *fcaps, *filter_caps;
gint i, j;
/* Allow downstream to specify width/height/framerate/PAR constraints
* and forward them upstream for video converters to handle
*/
templ_caps =
caps ? gst_caps_ref (caps) :
gst_pad_get_pad_template_caps (encoder->sinkpad);
allowed = gst_pad_get_allowed_caps (encoder->srcpad);
if (!allowed || gst_caps_is_empty (allowed) || gst_caps_is_any (allowed)) {
fcaps = templ_caps;
goto done;
}
GST_LOG_OBJECT (encoder, "template caps %" GST_PTR_FORMAT, templ_caps);
GST_LOG_OBJECT (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);
filter_caps = gst_caps_merge_structure (filter_caps, s);
}
}
fcaps = gst_caps_intersect (filter_caps, templ_caps);
gst_caps_unref (filter_caps);
gst_caps_unref (templ_caps);
if (filter) {
GST_LOG_OBJECT (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 (encoder, "proxy caps %" GST_PTR_FORMAT, fcaps);
return fcaps;
}
static GstCaps *
gst_video_encoder_sink_getcaps (GstVideoEncoder * encoder, GstCaps * filter)
{
GstVideoEncoderClass *klass;
GstCaps *caps;
klass = GST_VIDEO_ENCODER_GET_CLASS (encoder);
if (klass->getcaps)
caps = klass->getcaps (encoder, filter);
else
caps = gst_video_encoder_proxy_getcaps (encoder, NULL, filter);
GST_LOG_OBJECT (encoder, "Returning caps %" GST_PTR_FORMAT, caps);
return caps;
}
static gboolean
gst_video_encoder_decide_allocation_default (GstVideoEncoder * encoder,
GstQuery * query)
{
GstAllocator *allocator = NULL;
GstAllocationParams params;
gboolean update_allocator;
/* we got configuration from our peer or the decide_allocation method,
* parse them */
if (gst_query_get_n_allocation_params (query) > 0) {
/* try the allocator */
gst_query_parse_nth_allocation_param (query, 0, &allocator, &params);
update_allocator = TRUE;
} else {
allocator = NULL;
gst_allocation_params_init (&params);
update_allocator = FALSE;
}
if (update_allocator)
gst_query_set_nth_allocation_param (query, 0, allocator, &params);
else
gst_query_add_allocation_param (query, allocator, &params);
if (allocator)
gst_object_unref (allocator);
return TRUE;
}
static gboolean
gst_video_encoder_propose_allocation_default (GstVideoEncoder * encoder,
GstQuery * query)
{
GstCaps *caps;
GstVideoInfo info;
GstBufferPool *pool;
guint size;
gst_query_parse_allocation (query, &caps, NULL);
if (caps == NULL)
return FALSE;
if (!gst_video_info_from_caps (&info, caps))
return FALSE;
size = GST_VIDEO_INFO_SIZE (&info);
if (gst_query_get_n_allocation_pools (query) == 0) {
GstStructure *structure;
GstAllocator *allocator = NULL;
GstAllocationParams params = { 0, 15, 0, 0 };
if (gst_query_get_n_allocation_params (query) > 0)
gst_query_parse_nth_allocation_param (query, 0, &allocator, &params);
else
gst_query_add_allocation_param (query, allocator, &params);
pool = gst_video_buffer_pool_new ();
structure = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set_params (structure, caps, size, 0, 0);
gst_buffer_pool_config_set_allocator (structure, allocator, &params);
if (allocator)
gst_object_unref (allocator);
if (!gst_buffer_pool_set_config (pool, structure))
goto config_failed;
gst_query_add_allocation_pool (query, pool, size, 0, 0);
gst_object_unref (pool);
gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL);
}
return TRUE;
/* ERRORS */
config_failed:
{
GST_ERROR_OBJECT (encoder, "failed to set config");
gst_object_unref (pool);
return FALSE;
}
}
static gboolean
gst_video_encoder_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
GstVideoEncoder *encoder;
gboolean res = FALSE;
encoder = GST_VIDEO_ENCODER (parent);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstCaps *filter, *caps;
gst_query_parse_caps (query, &filter);
caps = gst_video_encoder_sink_getcaps (encoder, filter);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
break;
}
case GST_QUERY_ALLOCATION:
{
GstVideoEncoderClass *klass = GST_VIDEO_ENCODER_GET_CLASS (encoder);
if (klass->propose_allocation)
res = klass->propose_allocation (encoder, query);
break;
}
default:
res = gst_pad_query_default (pad, parent, query);
break;
}
return res;
}
static void
gst_video_encoder_finalize (GObject * object)
{
GstVideoEncoder *encoder;
GST_DEBUG_OBJECT (object, "finalize");
encoder = GST_VIDEO_ENCODER (object);
if (encoder->priv->headers) {
g_list_foreach (encoder->priv->headers, (GFunc) gst_buffer_unref, NULL);
g_list_free (encoder->priv->headers);
}
g_rec_mutex_clear (&encoder->stream_lock);
if (encoder->priv->allocator) {
gst_object_unref (encoder->priv->allocator);
encoder->priv->allocator = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_video_encoder_push_event (GstVideoEncoder * encoder, GstEvent * event)
{
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEGMENT:
{
GstSegment segment;
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
gst_event_copy_segment (event, &segment);
GST_DEBUG_OBJECT (encoder, "segment %" GST_SEGMENT_FORMAT, &segment);
if (segment.format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (encoder, "received non TIME segment");
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
break;
}
encoder->output_segment = segment;
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
break;
}
default:
break;
}
return gst_pad_push_event (encoder->srcpad, event);
}
static gboolean
gst_video_encoder_sink_event_default (GstVideoEncoder * encoder,
GstEvent * event)
{
GstVideoEncoderClass *encoder_class;
gboolean ret = FALSE;
encoder_class = GST_VIDEO_ENCODER_GET_CLASS (encoder);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = TRUE;
encoder->priv->do_caps = TRUE;
gst_event_unref (event);
event = NULL;
break;
}
case GST_EVENT_EOS:
{
GstFlowReturn flow_ret;
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
encoder->priv->at_eos = TRUE;
if (encoder_class->finish) {
flow_ret = encoder_class->finish (encoder);
} else {
flow_ret = GST_FLOW_OK;
}
ret = (flow_ret == GST_FLOW_OK);
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
break;
}
case GST_EVENT_SEGMENT:
{
GstSegment segment;
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
gst_event_copy_segment (event, &segment);
GST_DEBUG_OBJECT (encoder, "segment %" GST_SEGMENT_FORMAT, &segment);
if (segment.format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (encoder, "received non TIME newsegment");
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
break;
}
encoder->priv->at_eos = FALSE;
encoder->input_segment = segment;
ret = TRUE;
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
break;
}
case GST_EVENT_CUSTOM_DOWNSTREAM:
{
if (gst_video_event_is_force_key_unit (event)) {
GstClockTime running_time;
gboolean all_headers;
guint count;
if (gst_video_event_parse_downstream_force_key_unit (event,
NULL, NULL, &running_time, &all_headers, &count)) {
ForcedKeyUnitEvent *fevt;
GST_OBJECT_LOCK (encoder);
fevt = forced_key_unit_event_new (running_time, all_headers, count);
encoder->priv->force_key_unit =
g_list_append (encoder->priv->force_key_unit, fevt);
GST_OBJECT_UNLOCK (encoder);
GST_DEBUG_OBJECT (encoder,
"force-key-unit event: running-time %" GST_TIME_FORMAT
", all_headers %d, count %u",
GST_TIME_ARGS (running_time), all_headers, count);
}
gst_event_unref (event);
event = NULL;
ret = TRUE;
}
break;
}
case GST_EVENT_TAG:
{
GstTagList *tags;
gst_event_parse_tag (event, &tags);
if (gst_tag_list_get_scope (tags) == GST_TAG_SCOPE_STREAM) {
tags = gst_tag_list_copy (tags);
/* FIXME: make generic based on GST_TAG_FLAG_ENCODED */
gst_tag_list_remove_tag (tags, GST_TAG_CODEC);
gst_tag_list_remove_tag (tags, GST_TAG_AUDIO_CODEC);
gst_tag_list_remove_tag (tags, GST_TAG_VIDEO_CODEC);
gst_tag_list_remove_tag (tags, GST_TAG_SUBTITLE_CODEC);
gst_tag_list_remove_tag (tags, GST_TAG_CONTAINER_FORMAT);
gst_tag_list_remove_tag (tags, GST_TAG_BITRATE);
gst_tag_list_remove_tag (tags, GST_TAG_NOMINAL_BITRATE);
gst_tag_list_remove_tag (tags, GST_TAG_MAXIMUM_BITRATE);
gst_tag_list_remove_tag (tags, GST_TAG_MINIMUM_BITRATE);
gst_tag_list_remove_tag (tags, GST_TAG_ENCODER);
gst_tag_list_remove_tag (tags, GST_TAG_ENCODER_VERSION);
gst_video_encoder_merge_tags (encoder, tags, GST_TAG_MERGE_REPLACE);
gst_tag_list_unref (tags);
gst_event_unref (event);
event = NULL;
ret = TRUE;
}
break;
}
default:
break;
}
/* 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 simply
* not chain up to the parent class' event handler
*
* For FLUSH_STOP this is required because it is expected
* to be forwarded immediately and no buffers are queued anyway.
*/
if (event) {
if (!GST_EVENT_IS_SERIALIZED (event)
|| GST_EVENT_TYPE (event) == GST_EVENT_EOS
|| GST_EVENT_TYPE (event) == GST_EVENT_FLUSH_STOP) {
ret = gst_video_encoder_push_event (encoder, event);
} else {
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
encoder->priv->current_frame_events =
g_list_prepend (encoder->priv->current_frame_events, event);
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
ret = TRUE;
}
}
return ret;
}
static gboolean
gst_video_encoder_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
GstVideoEncoder *enc;
GstVideoEncoderClass *klass;
gboolean ret = TRUE;
enc = GST_VIDEO_ENCODER (parent);
klass = GST_VIDEO_ENCODER_GET_CLASS (enc);
GST_DEBUG_OBJECT (enc, "received event %d, %s", GST_EVENT_TYPE (event),
GST_EVENT_TYPE_NAME (event));
if (klass->sink_event)
ret = klass->sink_event (enc, event);
return ret;
}
static gboolean
gst_video_encoder_src_event_default (GstVideoEncoder * encoder,
GstEvent * event)
{
gboolean ret = FALSE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CUSTOM_UPSTREAM:
{
if (gst_video_event_is_force_key_unit (event)) {
GstClockTime running_time;
gboolean all_headers;
guint count;
if (gst_video_event_parse_upstream_force_key_unit (event,
&running_time, &all_headers, &count)) {
ForcedKeyUnitEvent *fevt;
GST_OBJECT_LOCK (encoder);
fevt = forced_key_unit_event_new (running_time, all_headers, count);
encoder->priv->force_key_unit =
g_list_append (encoder->priv->force_key_unit, fevt);
GST_OBJECT_UNLOCK (encoder);
GST_DEBUG_OBJECT (encoder,
"force-key-unit event: running-time %" GST_TIME_FORMAT
", all_headers %d, count %u",
GST_TIME_ARGS (running_time), all_headers, count);
}
gst_event_unref (event);
event = NULL;
ret = TRUE;
}
break;
}
default:
break;
}
if (event)
ret =
gst_pad_event_default (encoder->srcpad, GST_OBJECT_CAST (encoder),
event);
return ret;
}
static gboolean
gst_video_encoder_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstVideoEncoder *encoder;
GstVideoEncoderClass *klass;
gboolean ret = FALSE;
encoder = GST_VIDEO_ENCODER (parent);
klass = GST_VIDEO_ENCODER_GET_CLASS (encoder);
GST_LOG_OBJECT (encoder, "handling event: %" GST_PTR_FORMAT, event);
if (klass->src_event)
ret = klass->src_event (encoder, event);
return ret;
}
static gboolean
gst_video_encoder_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstVideoEncoderPrivate *priv;
GstVideoEncoder *enc;
gboolean res;
enc = GST_VIDEO_ENCODER (parent);
priv = enc->priv;
GST_LOG_OBJECT (enc, "handling query: %" GST_PTR_FORMAT, query);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CONVERT:
{
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_video_encoded_video_convert (priv->bytes, priv->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 (enc->sinkpad, 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 += priv->min_latency;
if (enc->priv->max_latency == GST_CLOCK_TIME_NONE) {
max_latency = GST_CLOCK_TIME_NONE;
} else if (max_latency != GST_CLOCK_TIME_NONE) {
max_latency += enc->priv->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;
error:
GST_DEBUG_OBJECT (enc, "query failed");
return res;
}
static GstVideoCodecFrame *
gst_video_encoder_new_frame (GstVideoEncoder * encoder, GstBuffer * buf,
GstClockTime pts, GstClockTime dts, GstClockTime duration)
{
GstVideoEncoderPrivate *priv = encoder->priv;
GstVideoCodecFrame *frame;
frame = g_slice_new0 (GstVideoCodecFrame);
frame->ref_count = 1;
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
frame->system_frame_number = priv->system_frame_number;
priv->system_frame_number++;
frame->presentation_frame_number = priv->presentation_frame_number;
priv->presentation_frame_number++;
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
frame->events = priv->current_frame_events;
priv->current_frame_events = NULL;
frame->input_buffer = buf;
frame->pts = pts;
frame->dts = dts;
frame->duration = duration;
frame->abidata.ABI.ts = pts;
return frame;
}
static GstFlowReturn
gst_video_encoder_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstVideoEncoder *encoder;
GstVideoEncoderPrivate *priv;
GstVideoEncoderClass *klass;
GstVideoCodecFrame *frame;
GstClockTime pts, duration;
GstFlowReturn ret = GST_FLOW_OK;
guint64 start, stop, cstart, cstop;
encoder = GST_VIDEO_ENCODER (parent);
priv = encoder->priv;
klass = GST_VIDEO_ENCODER_GET_CLASS (encoder);
g_return_val_if_fail (klass->handle_frame != NULL, GST_FLOW_ERROR);
if (G_UNLIKELY (encoder->priv->do_caps)) {
GstCaps *caps = gst_pad_get_current_caps (encoder->sinkpad);
if (!caps)
goto not_negotiated;
if (!gst_video_encoder_setcaps (encoder, caps)) {
gst_caps_unref (caps);
goto not_negotiated;
}
gst_caps_unref (caps);
encoder->priv->do_caps = FALSE;
}
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
pts = GST_BUFFER_PTS (buf);
duration = GST_BUFFER_DURATION (buf);
GST_LOG_OBJECT (encoder,
"received buffer of size %" G_GSIZE_FORMAT " with PTS %" GST_TIME_FORMAT
", DTS %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
gst_buffer_get_size (buf), GST_TIME_ARGS (pts),
GST_TIME_ARGS (GST_BUFFER_DTS (buf)), GST_TIME_ARGS (duration));
if (priv->at_eos) {
ret = GST_FLOW_EOS;
goto done;
}
start = pts;
if (GST_CLOCK_TIME_IS_VALID (duration))
stop = start + duration;
else
stop = GST_CLOCK_TIME_NONE;
/* Drop buffers outside of segment */
if (!gst_segment_clip (&encoder->input_segment,
GST_FORMAT_TIME, start, stop, &cstart, &cstop)) {
GST_DEBUG_OBJECT (encoder, "clipping to segment dropped frame");
gst_buffer_unref (buf);
goto done;
}
/* incoming DTS is not really relevant and does not make sense anyway,
* so pass along _NONE and maybe come up with something better later on */
frame = gst_video_encoder_new_frame (encoder, buf, cstart,
GST_CLOCK_TIME_NONE, cstop - cstart);
GST_OBJECT_LOCK (encoder);
if (priv->force_key_unit) {
ForcedKeyUnitEvent *fevt = NULL;
GstClockTime running_time;
GList *l;
running_time =
gst_segment_to_running_time (&encoder->output_segment, GST_FORMAT_TIME,
cstart);
for (l = priv->force_key_unit; l; l = l->next) {
ForcedKeyUnitEvent *tmp = l->data;
/* Skip pending keyunits */
if (tmp->pending)
continue;
/* Simple case, keyunit ASAP */
if (tmp->running_time == GST_CLOCK_TIME_NONE) {
fevt = tmp;
break;
}
/* Event for before this frame */
if (tmp->running_time <= running_time) {
fevt = tmp;
break;
}
}
if (fevt) {
GST_DEBUG_OBJECT (encoder,
"Forcing a key unit at running time %" GST_TIME_FORMAT,
GST_TIME_ARGS (running_time));
GST_VIDEO_CODEC_FRAME_SET_FORCE_KEYFRAME (frame);
if (fevt->all_headers)
GST_VIDEO_CODEC_FRAME_SET_FORCE_KEYFRAME_HEADERS (frame);
fevt->pending = TRUE;
}
}
GST_OBJECT_UNLOCK (encoder);
gst_video_codec_frame_ref (frame);
priv->frames = g_list_append (priv->frames, frame);
/* new data, more finish needed */
priv->drained = FALSE;
GST_LOG_OBJECT (encoder, "passing frame pfn %d to subclass",
frame->presentation_frame_number);
ret = klass->handle_frame (encoder, frame);
done:
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
return ret;
/* ERRORS */
not_negotiated:
{
GST_ELEMENT_ERROR (encoder, CORE, NEGOTIATION, (NULL),
("encoder not initialized"));
gst_buffer_unref (buf);
return GST_FLOW_NOT_NEGOTIATED;
}
}
static GstStateChangeReturn
gst_video_encoder_change_state (GstElement * element, GstStateChange transition)
{
GstVideoEncoder *encoder;
GstVideoEncoderClass *encoder_class;
GstStateChangeReturn ret;
encoder = GST_VIDEO_ENCODER (element);
encoder_class = GST_VIDEO_ENCODER_GET_CLASS (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
/* open device/library if needed */
if (encoder_class->open && !encoder_class->open (encoder))
goto open_failed;
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* Initialize device/library if needed */
if (encoder_class->start && !encoder_class->start (encoder))
goto start_failed;
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_video_encoder_reset (encoder);
if (encoder_class->stop && !encoder_class->stop (encoder))
goto stop_failed;
break;
case GST_STATE_CHANGE_READY_TO_NULL:
/* close device/library if needed */
if (encoder_class->close && !encoder_class->close (encoder))
goto close_failed;
break;
default:
break;
}
return ret;
/* Errors */
open_failed:
{
GST_ELEMENT_ERROR (encoder, LIBRARY, INIT, (NULL),
("Failed to open encoder"));
return GST_STATE_CHANGE_FAILURE;
}
start_failed:
{
GST_ELEMENT_ERROR (encoder, LIBRARY, INIT, (NULL),
("Failed to start encoder"));
return GST_STATE_CHANGE_FAILURE;
}
stop_failed:
{
GST_ELEMENT_ERROR (encoder, LIBRARY, INIT, (NULL),
("Failed to stop encoder"));
return GST_STATE_CHANGE_FAILURE;
}
close_failed:
{
GST_ELEMENT_ERROR (encoder, LIBRARY, INIT, (NULL),
("Failed to close encoder"));
return GST_STATE_CHANGE_FAILURE;
}
}
static gboolean
gst_video_encoder_negotiate_default (GstVideoEncoder * encoder)
{
GstVideoEncoderClass *klass = GST_VIDEO_ENCODER_GET_CLASS (encoder);
GstAllocator *allocator;
GstAllocationParams params;
gboolean ret;
GstVideoCodecState *state = encoder->priv->output_state;
GstVideoInfo *info = &state->info;
GstQuery *query = NULL;
g_return_val_if_fail (state->caps != NULL, FALSE);
if (encoder->priv->output_state_changed) {
state->caps = gst_caps_make_writable (state->caps);
/* Fill caps */
gst_caps_set_simple (state->caps, "width", G_TYPE_INT, info->width,
"height", G_TYPE_INT, info->height,
"pixel-aspect-ratio", GST_TYPE_FRACTION,
info->par_n, info->par_d, NULL);
if (info->flags & GST_VIDEO_FLAG_VARIABLE_FPS && info->fps_n != 0) {
/* variable fps with a max-framerate */
gst_caps_set_simple (state->caps, "framerate", GST_TYPE_FRACTION, 0, 1,
"max-framerate", GST_TYPE_FRACTION, info->fps_n, info->fps_d, NULL);
} else {
/* no variable fps or no max-framerate */
gst_caps_set_simple (state->caps, "framerate", GST_TYPE_FRACTION,
info->fps_n, info->fps_d, NULL);
}
if (state->codec_data)
gst_caps_set_simple (state->caps, "codec_data", GST_TYPE_BUFFER,
state->codec_data, NULL);
encoder->priv->output_state_changed = FALSE;
}
ret = gst_pad_set_caps (encoder->srcpad, state->caps);
if (!ret)
goto done;
query = gst_query_new_allocation (state->caps, TRUE);
if (!gst_pad_peer_query (encoder->srcpad, query)) {
GST_DEBUG_OBJECT (encoder, "didn't get downstream ALLOCATION hints");
}
g_assert (klass->decide_allocation != NULL);
ret = klass->decide_allocation (encoder, query);
GST_DEBUG_OBJECT (encoder, "ALLOCATION (%d) params: %" GST_PTR_FORMAT, ret,
query);
if (!ret)
goto no_decide_allocation;
/* we got configuration from our peer or the decide_allocation method,
* parse them */
if (gst_query_get_n_allocation_params (query) > 0) {
gst_query_parse_nth_allocation_param (query, 0, &allocator, &params);
} else {
allocator = NULL;
gst_allocation_params_init (&params);
}
if (encoder->priv->allocator)
gst_object_unref (encoder->priv->allocator);
encoder->priv->allocator = allocator;
encoder->priv->params = params;
done:
if (query)
gst_query_unref (query);
return ret;
/* Errors */
no_decide_allocation:
{
GST_WARNING_OBJECT (encoder, "Subclass failed to decide allocation");
goto done;
}
}
/**
* gst_video_encoder_negotiate:
* @encoder: a #GstVideoEncoder
*
* Negotiate with downstream elements to currently configured #GstVideoCodecState.
*
* Returns: #TRUE if the negotiation succeeded, else #FALSE.
*/
gboolean
gst_video_encoder_negotiate (GstVideoEncoder * encoder)
{
GstVideoEncoderClass *klass;
gboolean ret = TRUE;
g_return_val_if_fail (GST_IS_VIDEO_ENCODER (encoder), FALSE);
klass = GST_VIDEO_ENCODER_GET_CLASS (encoder);
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
if (klass->negotiate)
ret = klass->negotiate (encoder);
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
return ret;
}
/**
* gst_video_encoder_allocate_output_buffer:
* @encoder: a #GstVideoEncoder
* @size: size of the buffer
*
* Helper function that allocates a buffer to hold an encoded video frame
* for @encoder's current #GstVideoCodecState.
*
* Returns: (transfer full): allocated buffer
*/
GstBuffer *
gst_video_encoder_allocate_output_buffer (GstVideoEncoder * encoder, gsize size)
{
GstBuffer *buffer;
g_return_val_if_fail (size > 0, NULL);
GST_DEBUG ("alloc src buffer");
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
if (G_UNLIKELY (encoder->priv->output_state_changed
|| (encoder->priv->output_state
&& gst_pad_check_reconfigure (encoder->srcpad))))
gst_video_encoder_negotiate (encoder);
buffer =
gst_buffer_new_allocate (encoder->priv->allocator, size,
&encoder->priv->params);
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
return buffer;
}
/**
* gst_video_encoder_allocate_output_frame:
* @encoder: a #GstVideoEncoder
* @frame: a #GstVideoCodecFrame
* @size: size of the buffer
*
* Helper function that allocates a buffer to hold an encoded video frame for @encoder's
* current #GstVideoCodecState. Subclass should already have configured video
* state and set src pad caps.
*
* The buffer allocated here is owned by the frame and you should only
* keep references to the frame, not the buffer.
*
* Returns: %GST_FLOW_OK if an output buffer could be allocated
*/
GstFlowReturn
gst_video_encoder_allocate_output_frame (GstVideoEncoder *
encoder, GstVideoCodecFrame * frame, gsize size)
{
g_return_val_if_fail (frame->output_buffer == NULL, GST_FLOW_ERROR);
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
if (G_UNLIKELY (encoder->priv->output_state_changed
|| (encoder->priv->output_state
&& gst_pad_check_reconfigure (encoder->srcpad))))
gst_video_encoder_negotiate (encoder);
GST_LOG_OBJECT (encoder, "alloc buffer size %" G_GSIZE_FORMAT, size);
frame->output_buffer =
gst_buffer_new_allocate (encoder->priv->allocator, size,
&encoder->priv->params);
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
return frame->output_buffer ? GST_FLOW_OK : GST_FLOW_ERROR;
}
/**
* gst_video_encoder_finish_frame:
* @encoder: a #GstVideoEncoder
* @frame: (transfer full): an encoded #GstVideoCodecFrame
*
* @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 @pre_push.
* In any case, the frame is considered finished and released.
*
* After calling this function the output buffer of the frame is to be
* considered read-only. This function will also change the metadata
* of the buffer.
*
* Returns: a #GstFlowReturn resulting from sending data downstream
*/
GstFlowReturn
gst_video_encoder_finish_frame (GstVideoEncoder * encoder,
GstVideoCodecFrame * frame)
{
GstVideoEncoderPrivate *priv = encoder->priv;
GstFlowReturn ret = GST_FLOW_OK;
GstVideoEncoderClass *encoder_class;
GList *l;
gboolean send_headers = FALSE;
gboolean discont = (frame->presentation_frame_number == 0);
encoder_class = GST_VIDEO_ENCODER_GET_CLASS (encoder);
GST_LOG_OBJECT (encoder,
"finish frame fpn %d", frame->presentation_frame_number);
GST_LOG_OBJECT (encoder, "frame PTS %" GST_TIME_FORMAT
", DTS %" GST_TIME_FORMAT, GST_TIME_ARGS (frame->pts),
GST_TIME_ARGS (frame->dts));
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
if (G_UNLIKELY (priv->output_state_changed || (priv->output_state
&& gst_pad_check_reconfigure (encoder->srcpad))))
gst_video_encoder_negotiate (encoder);
if (G_UNLIKELY (priv->output_state == NULL))
goto no_output_state;
/* Push all pending events that arrived before this frame */
for (l = priv->frames; l; l = l->next) {
GstVideoCodecFrame *tmp = l->data;
if (tmp->events) {
GList *k;
for (k = g_list_last (tmp->events); k; k = k->prev)
gst_video_encoder_push_event (encoder, k->data);
g_list_free (tmp->events);
tmp->events = NULL;
}
if (tmp == frame)
break;
}
if (priv->tags && priv->tags_changed) {
gst_video_encoder_push_event (encoder,
gst_event_new_tag (gst_tag_list_ref (priv->tags)));
priv->tags_changed = FALSE;
}
/* no buffer data means this frame is skipped/dropped */
if (!frame->output_buffer) {
GST_DEBUG_OBJECT (encoder, "skipping frame %" GST_TIME_FORMAT,
GST_TIME_ARGS (frame->pts));
goto done;
}
if (GST_VIDEO_CODEC_FRAME_IS_SYNC_POINT (frame) && priv->force_key_unit) {
GstClockTime stream_time, running_time;
GstEvent *ev;
ForcedKeyUnitEvent *fevt = NULL;
GList *l;
running_time =
gst_segment_to_running_time (&encoder->output_segment, GST_FORMAT_TIME,
frame->pts);
GST_OBJECT_LOCK (encoder);
for (l = priv->force_key_unit; l; l = l->next) {
ForcedKeyUnitEvent *tmp = l->data;
/* Skip non-pending keyunits */
if (!tmp->pending)
continue;
/* Simple case, keyunit ASAP */
if (tmp->running_time == GST_CLOCK_TIME_NONE) {
fevt = tmp;
break;
}
/* Event for before this frame */
if (tmp->running_time <= running_time) {
fevt = tmp;
break;
}
}
if (fevt) {
priv->force_key_unit = g_list_remove (priv->force_key_unit, fevt);
}
GST_OBJECT_UNLOCK (encoder);
if (fevt) {
stream_time =
gst_segment_to_stream_time (&encoder->output_segment, GST_FORMAT_TIME,
frame->pts);
ev = gst_video_event_new_downstream_force_key_unit
(frame->pts, stream_time, running_time,
fevt->all_headers, fevt->count);
gst_video_encoder_push_event (encoder, ev);
if (fevt->all_headers)
send_headers = TRUE;
GST_DEBUG_OBJECT (encoder,
"Forced key unit: running-time %" GST_TIME_FORMAT
", all_headers %d, count %u",
GST_TIME_ARGS (running_time), fevt->all_headers, fevt->count);
forced_key_unit_event_free (fevt);
}
}
if (GST_VIDEO_CODEC_FRAME_IS_SYNC_POINT (frame)) {
priv->distance_from_sync = 0;
GST_BUFFER_FLAG_UNSET (frame->output_buffer, GST_BUFFER_FLAG_DELTA_UNIT);
/* For keyframes, DTS = PTS */
if (!GST_CLOCK_TIME_IS_VALID (frame->dts)) {
frame->dts = frame->pts;
} else if (GST_CLOCK_TIME_IS_VALID (frame->pts) && frame->pts != frame->dts) {
GST_WARNING_OBJECT (encoder, "keyframe PTS != DTS");
}
} else {
GST_BUFFER_FLAG_SET (frame->output_buffer, GST_BUFFER_FLAG_DELTA_UNIT);
}
/* DTS is expected monotone ascending,
* so a good guess is the lowest unsent PTS (all being OK) */
{
GstClockTime min_ts = GST_CLOCK_TIME_NONE;
GstVideoCodecFrame *oframe = NULL;
gboolean seen_none = FALSE;
/* some maintenance regardless */
for (l = priv->frames; l; l = l->next) {
GstVideoCodecFrame *tmp = l->data;
if (!GST_CLOCK_TIME_IS_VALID (tmp->abidata.ABI.ts)) {
seen_none = TRUE;
continue;
}
if (!GST_CLOCK_TIME_IS_VALID (min_ts) || tmp->abidata.ABI.ts < min_ts) {
min_ts = tmp->abidata.ABI.ts;
oframe = tmp;
}
}
/* save a ts if needed */
if (oframe && oframe != frame) {
oframe->abidata.ABI.ts = frame->abidata.ABI.ts;
}
/* and set if needed */
if (!GST_CLOCK_TIME_IS_VALID (frame->dts) && !seen_none) {
frame->dts = min_ts;
GST_DEBUG_OBJECT (encoder,
"no valid DTS, using oldest PTS %" GST_TIME_FORMAT,
GST_TIME_ARGS (frame->pts));
}
}
frame->distance_from_sync = priv->distance_from_sync;
priv->distance_from_sync++;
GST_BUFFER_PTS (frame->output_buffer) = frame->pts;
GST_BUFFER_DTS (frame->output_buffer) = frame->dts;
GST_BUFFER_DURATION (frame->output_buffer) = frame->duration;
/* update rate estimate */
priv->bytes += gst_buffer_get_size (frame->output_buffer);
if (GST_CLOCK_TIME_IS_VALID (frame->duration)) {
priv->time += frame->duration;
} else {
/* better none than nothing valid */
priv->time = GST_CLOCK_TIME_NONE;
}
if (G_UNLIKELY (send_headers || priv->new_headers)) {
GList *tmp, *copy = NULL;
GST_DEBUG_OBJECT (encoder, "Sending headers");
/* First make all buffers metadata-writable */
for (tmp = priv->headers; tmp; tmp = tmp->next) {
GstBuffer *tmpbuf = GST_BUFFER (tmp->data);
copy = g_list_append (copy, gst_buffer_make_writable (tmpbuf));
}
g_list_free (priv->headers);
priv->headers = copy;
for (tmp = priv->headers; tmp; tmp = tmp->next) {
GstBuffer *tmpbuf = GST_BUFFER (tmp->data);
gst_buffer_ref (tmpbuf);
priv->bytes += gst_buffer_get_size (tmpbuf);
if (G_UNLIKELY (discont)) {
GST_LOG_OBJECT (encoder, "marking discont");
GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
discont = FALSE;
}
gst_pad_push (encoder->srcpad, tmpbuf);
}
priv->new_headers = FALSE;
}
if (G_UNLIKELY (discont)) {
GST_LOG_OBJECT (encoder, "marking discont");
GST_BUFFER_FLAG_SET (frame->output_buffer, GST_BUFFER_FLAG_DISCONT);
}
if (encoder_class->pre_push)
ret = encoder_class->pre_push (encoder, frame);
/* A reference always needs to be owned by the frame on the buffer.
* For that reason, we use a complete sub-buffer (zero-cost) to push
* downstream.
* The original buffer will be free-ed only when downstream AND the
* current implementation are done with the frame. */
if (ret == GST_FLOW_OK)
ret = gst_pad_push (encoder->srcpad, gst_buffer_ref (frame->output_buffer));
done:
/* handed out */
/* unref once from the list */
l = g_list_find (priv->frames, frame);
if (l) {
gst_video_codec_frame_unref (frame);
priv->frames = g_list_delete_link (priv->frames, l);
}
/* unref because this function takes ownership */
gst_video_codec_frame_unref (frame);
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
return ret;
/* ERRORS */
no_output_state:
{
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
GST_ERROR_OBJECT (encoder, "Output state was not configured");
return GST_FLOW_ERROR;
}
}
/**
* gst_video_encoder_get_output_state:
* @encoder: a #GstVideoEncoder
*
* Get the current #GstVideoCodecState
*
* Returns: (transfer full): #GstVideoCodecState describing format of video data.
*/
GstVideoCodecState *
gst_video_encoder_get_output_state (GstVideoEncoder * encoder)
{
GstVideoCodecState *state;
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
state = gst_video_codec_state_ref (encoder->priv->output_state);
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
return state;
}
/**
* gst_video_encoder_set_output_state:
* @encoder: a #GstVideoEncoder
* @caps: (transfer full): the #GstCaps to use for the output
* @reference: (allow-none) (transfer none): An optional reference @GstVideoCodecState
*
* Creates a new #GstVideoCodecState with the specified caps as the output state
* for the encoder.
* Any previously set output state on @encoder will be replaced by the newly
* created one.
*
* The specified @caps should not contain any resolution, pixel-aspect-ratio,
* framerate, codec-data, .... Those should be specified instead in the returned
* #GstVideoCodecState.
*
* If the subclass wishes to copy over existing fields (like pixel aspect ratio,
* or framerate) from an existing #GstVideoCodecState, it can be provided as a
* @reference.
*
* If the subclass wishes to override some fields from the output state (like
* pixel-aspect-ratio or framerate) it can do so on the returned #GstVideoCodecState.
*
* The new output state will only take effect (set on pads and buffers) starting
* from the next call to #gst_video_encoder_finish_frame().
*
* Returns: (transfer full): the newly configured output state.
*/
GstVideoCodecState *
gst_video_encoder_set_output_state (GstVideoEncoder * encoder, GstCaps * caps,
GstVideoCodecState * reference)
{
GstVideoEncoderPrivate *priv = encoder->priv;
GstVideoCodecState *state;
g_return_val_if_fail (caps != NULL, NULL);
state = _new_output_state (caps, reference);
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
if (priv->output_state)
gst_video_codec_state_unref (priv->output_state);
priv->output_state = gst_video_codec_state_ref (state);
priv->output_state_changed = TRUE;
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
return state;
}
/**
* gst_video_encoder_set_latency:
* @encoder: a #GstVideoEncoder
* @min_latency: minimum latency
* @max_latency: maximum latency
*
* Informs baseclass of encoding latency.
*/
void
gst_video_encoder_set_latency (GstVideoEncoder * encoder,
GstClockTime min_latency, GstClockTime max_latency)
{
g_return_if_fail (GST_CLOCK_TIME_IS_VALID (min_latency));
g_return_if_fail (max_latency >= min_latency);
GST_OBJECT_LOCK (encoder);
encoder->priv->min_latency = min_latency;
encoder->priv->max_latency = max_latency;
GST_OBJECT_UNLOCK (encoder);
gst_element_post_message (GST_ELEMENT_CAST (encoder),
gst_message_new_latency (GST_OBJECT_CAST (encoder)));
}
/**
* gst_video_encoder_get_latency:
* @encoder: a #GstVideoEncoder
* @min_latency: (out) (allow-none): address of variable in which to store the
* configured minimum latency, or %NULL
* @max_latency: (out) (allow-none): address of variable in which to store the
* configured maximum latency, or %NULL
*
* Query the configured encoding latency. Results will be returned via
* @min_latency and @max_latency.
*/
void
gst_video_encoder_get_latency (GstVideoEncoder * encoder,
GstClockTime * min_latency, GstClockTime * max_latency)
{
GST_OBJECT_LOCK (encoder);
if (min_latency)
*min_latency = encoder->priv->min_latency;
if (max_latency)
*max_latency = encoder->priv->max_latency;
GST_OBJECT_UNLOCK (encoder);
}
/**
* gst_video_encoder_get_oldest_frame:
* @encoder: a #GstVideoEncoder
*
* Get the oldest unfinished pending #GstVideoCodecFrame
*
* Returns: (transfer full): oldest unfinished pending #GstVideoCodecFrame
*/
GstVideoCodecFrame *
gst_video_encoder_get_oldest_frame (GstVideoEncoder * encoder)
{
GstVideoCodecFrame *frame = NULL;
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
if (encoder->priv->frames)
frame = gst_video_codec_frame_ref (encoder->priv->frames->data);
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
return (GstVideoCodecFrame *) frame;
}
/**
* gst_video_encoder_get_frame:
* @encoder: a #GstVideoEnccoder
* @frame_number: system_frame_number of a frame
*
* Get a pending unfinished #GstVideoCodecFrame
*
* Returns: (transfer full): pending unfinished #GstVideoCodecFrame identified by @frame_number.
*/
GstVideoCodecFrame *
gst_video_encoder_get_frame (GstVideoEncoder * encoder, int frame_number)
{
GList *g;
GstVideoCodecFrame *frame = NULL;
GST_DEBUG_OBJECT (encoder, "frame_number : %d", frame_number);
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
for (g = encoder->priv->frames; g; g = g->next) {
GstVideoCodecFrame *tmp = g->data;
if (tmp->system_frame_number == frame_number) {
frame = gst_video_codec_frame_ref (tmp);
break;
}
}
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
return frame;
}
/**
* gst_video_encoder_get_frames:
* @encoder: a #GstVideoEncoder
*
* Get all pending unfinished #GstVideoCodecFrame
*
* Returns: (transfer full) (element-type GstVideoCodecFrame): pending unfinished #GstVideoCodecFrame.
*/
GList *
gst_video_encoder_get_frames (GstVideoEncoder * encoder)
{
GList *frames;
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
frames = g_list_copy (encoder->priv->frames);
g_list_foreach (frames, (GFunc) gst_video_codec_frame_ref, NULL);
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
return frames;
}
/**
* gst_video_encoder_merge_tags:
* @encoder: a #GstVideoEncoder
* @tags: a #GstTagList to merge
* @mode: the #GstTagMergeMode to use
*
* Adds tags to so-called pending tags, which will be processed
* before pushing out data downstream.
*
* Note that this is provided for convenience, and the subclass is
* not required to use this and can still do tag handling on its own.
*
* MT safe.
*/
void
gst_video_encoder_merge_tags (GstVideoEncoder * encoder,
const GstTagList * tags, GstTagMergeMode mode)
{
GstTagList *otags;
g_return_if_fail (GST_IS_VIDEO_ENCODER (encoder));
g_return_if_fail (tags == NULL || GST_IS_TAG_LIST (tags));
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
if (tags)
GST_DEBUG_OBJECT (encoder, "merging tags %" GST_PTR_FORMAT, tags);
otags = encoder->priv->tags;
encoder->priv->tags = gst_tag_list_merge (encoder->priv->tags, tags, mode);
if (otags)
gst_tag_list_unref (otags);
encoder->priv->tags_changed = TRUE;
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
}
/**
* gst_video_encoder_get_allocator:
* @encoder: a #GstVideoEncoder
* @allocator: (out) (allow-none) (transfer full): the #GstAllocator
* used
* @params: (out) (allow-none) (transfer full): the
* #GstAllocatorParams of @allocator
*
* Lets #GstVideoEncoder sub-classes to know the memory @allocator
* used by the base class and its @params.
*
* Unref the @allocator after use it.
*/
void
gst_video_encoder_get_allocator (GstVideoEncoder * encoder,
GstAllocator ** allocator, GstAllocationParams * params)
{
g_return_if_fail (GST_IS_VIDEO_ENCODER (encoder));
if (allocator)
*allocator = encoder->priv->allocator ?
gst_object_ref (encoder->priv->allocator) : NULL;
if (params)
*params = encoder->priv->params;
}
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