gstvideoencoder.c 48.1 KB
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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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, 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
 *
 * * Change _set_output_format() to steal the reference of the provided caps
 * * 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
 */

/* FIXME 0.11: suppress warnings for deprecated API such as GStaticRecMutex
 * with newer GLib versions (>= 2.31.0) */
#define GLIB_DISABLE_DEPRECATION_WARNINGS

#include "gstvideoencoder.h"
#include "gstvideoutils.h"

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#include <gst/video/gstvideometa.h>

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#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;

  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 */

  guint64 system_frame_number;

  GList *frames;                /* Protected with OBJECT_LOCK */
  GstVideoCodecState *input_state;
  GstVideoCodecState *output_state;
  gboolean output_state_changed;

  gint64 bytes;
  gint64 time;
};

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;
}

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static GstElementClass *parent_class = NULL;
static void gst_video_encoder_class_init (GstVideoEncoderClass * klass);
static void gst_video_encoder_init (GstVideoEncoder * enc,
    GstVideoEncoderClass * klass);

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static void gst_video_encoder_finalize (GObject * object);

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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);
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static GstStateChangeReturn gst_video_encoder_change_state (GstElement *
    element, GstStateChange transition);
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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);
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static GstVideoCodecFrame *gst_video_encoder_new_frame (GstVideoEncoder *
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    encoder, GstBuffer * buf, GstClockTime pts, GstClockTime dts,
    GstClockTime duration);
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static gboolean gst_video_encoder_sink_event_default (GstVideoEncoder * encoder,
    GstEvent * event);
static gboolean gst_video_encoder_src_event_default (GstVideoEncoder * encoder,
    GstEvent * event);
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static gboolean gst_video_encoder_propose_allocation_default (GstVideoEncoder *
    encoder, GstQuery * query);
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/* 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)
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{
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  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;
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}

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);

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  GST_DEBUG_CATEGORY_INIT (videoencoder_debug, "videoencoder", 0,
      "Base Video Encoder");

  parent_class = g_type_class_peek_parent (klass);

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  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);
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  klass->sink_event = gst_video_encoder_sink_event_default;
  klass->src_event = gst_video_encoder_src_event_default;
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  klass->propose_allocation = gst_video_encoder_propose_allocation_default;
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}

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;

  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));
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  gst_pad_set_query_function (pad,
      GST_DEBUG_FUNCPTR (gst_video_encoder_sink_query));
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  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);

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  g_rec_mutex_init (&encoder->stream_lock);
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  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.
 *
 * Since: 0.10.36
 */
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
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gst_video_encoder_setcaps (GstVideoEncoder * encoder, GstCaps * caps)
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{
  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
 *
 * 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
 *
 * Since: 0.10.36
 */
GstCaps *
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gst_video_encoder_proxy_getcaps (GstVideoEncoder * encoder, GstCaps * caps,
    GstCaps * filter)
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{
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  GstCaps *templ_caps;
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  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
   */
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  templ_caps =
      caps ? gst_caps_ref (caps) :
      gst_pad_get_pad_template_caps (encoder->sinkpad);
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  allowed = gst_pad_get_allowed_caps (encoder->srcpad);

  if (!allowed || gst_caps_is_empty (allowed) || gst_caps_is_any (allowed)) {
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    fcaps = templ_caps;
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    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;

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      s = gst_structure_new_id_empty (q_name);
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      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);

670
      filter_caps = gst_caps_merge_structure (filter_caps, s);
671 672 673 674 675
    }
  }

  fcaps = gst_caps_intersect (filter_caps, templ_caps);
  gst_caps_unref (filter_caps);
676 677 678 679 680 681 682 683
  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;
  }
684 685 686 687 688 689 690 691 692 693

done:
  gst_caps_replace (&allowed, NULL);

  GST_LOG_OBJECT (encoder, "proxy caps %" GST_PTR_FORMAT, fcaps);

  return fcaps;
}

static GstCaps *
694
gst_video_encoder_sink_getcaps (GstVideoEncoder * encoder, GstCaps * filter)
695 696 697 698 699 700 701
{
  GstVideoEncoderClass *klass;
  GstCaps *caps;

  klass = GST_VIDEO_ENCODER_GET_CLASS (encoder);

  if (klass->getcaps)
702
    caps = klass->getcaps (encoder, filter);
703
  else
704
    caps = gst_video_encoder_proxy_getcaps (encoder, NULL, filter);
705 706 707 708 709 710

  GST_LOG_OBJECT (encoder, "Returning caps %" GST_PTR_FORMAT, caps);

  return caps;
}

711 712 713 714 715 716
static gboolean
gst_video_encoder_propose_allocation_default (GstVideoEncoder * encoder,
    GstQuery * query)
{
  return TRUE;
}
717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738

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;
    }
739 740 741 742 743 744 745 746
    case GST_QUERY_ALLOCATION:
    {
      GstVideoEncoderClass *klass = GST_VIDEO_ENCODER_GET_CLASS (encoder);

      if (klass->propose_allocation)
        res = klass->propose_allocation (encoder, query);
      break;
    }
747 748 749 750 751 752 753
    default:
      res = gst_pad_query_default (pad, parent, query);
      break;
  }
  return res;
}

754 755 756 757 758 759 760 761 762 763 764 765
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);
  }
766
  g_rec_mutex_clear (&encoder->stream_lock);
767 768 769 770 771 772 773 774

  G_OBJECT_CLASS (parent_class)->finalize (object);
}

static gboolean
gst_video_encoder_push_event (GstVideoEncoder * encoder, GstEvent * event)
{
  switch (GST_EVENT_TYPE (event)) {
775
    case GST_EVENT_SEGMENT:
776
    {
777
      GstSegment segment;
778 779 780

      GST_VIDEO_ENCODER_STREAM_LOCK (encoder);

781
      gst_event_copy_segment (event, &segment);
782

783 784 785 786
      GST_DEBUG_OBJECT (encoder, "segment %" GST_SEGMENT_FORMAT, &segment);

      if (segment.format != GST_FORMAT_TIME) {
        GST_DEBUG_OBJECT (encoder, "received non TIME segment");
787 788 789 790
        GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
        break;
      }

791
      encoder->output_segment = segment;
792 793 794 795 796 797 798 799 800 801 802
      GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
      break;
    }
    default:
      break;
  }

  return gst_pad_push_event (encoder->srcpad, event);
}

static gboolean
803 804
gst_video_encoder_sink_event_default (GstVideoEncoder * encoder,
    GstEvent * event)
805 806 807 808 809 810 811
{
  GstVideoEncoderClass *encoder_class;
  gboolean ret = FALSE;

  encoder_class = GST_VIDEO_ENCODER_GET_CLASS (encoder);

  switch (GST_EVENT_TYPE (event)) {
812 813 814 815 816 817 818
    case GST_EVENT_CAPS:
    {
      GstCaps *caps;

      gst_event_parse_caps (event, &caps);
      ret = gst_video_encoder_setcaps (encoder, caps);
      gst_event_unref (event);
819
      event = NULL;
820 821
      break;
    }
822 823 824 825 826 827 828 829 830 831 832 833 834
    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;
      }

835
      ret = (flow_ret == GST_FLOW_OK);
836 837 838
      GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
      break;
    }
839
    case GST_EVENT_SEGMENT:
840
    {
841
      GstSegment segment;
842 843 844

      GST_VIDEO_ENCODER_STREAM_LOCK (encoder);

845 846 847
      gst_event_copy_segment (event, &segment);

      GST_DEBUG_OBJECT (encoder, "segment %" GST_SEGMENT_FORMAT, &segment);
848

849
      if (segment.format != GST_FORMAT_TIME) {
850 851 852 853 854 855 856
        GST_DEBUG_OBJECT (encoder, "received non TIME newsegment");
        GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
        break;
      }

      encoder->priv->at_eos = FALSE;

857
      encoder->input_segment = segment;
858
      ret = TRUE;
859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884
      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);
885
        event = NULL;
886 887 888 889 890 891 892 893
        ret = TRUE;
      }
      break;
    }
    default:
      break;
  }

894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913
  /* 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);
914
      ret = TRUE;
915 916 917
    }
  }

918 919 920 921
  return ret;
}

static gboolean
922 923
gst_video_encoder_sink_event (GstPad * pad, GstObject * parent,
    GstEvent * event)
924 925 926 927 928
{
  GstVideoEncoder *enc;
  GstVideoEncoderClass *klass;
  gboolean ret = TRUE;

929
  enc = GST_VIDEO_ENCODER (parent);
930 931 932 933 934 935
  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)
936
    ret = klass->sink_event (enc, event);
937 938 939 940 941

  return ret;
}

static gboolean
942 943
gst_video_encoder_src_event_default (GstVideoEncoder * encoder,
    GstEvent * event)
944
{
945
  gboolean ret = FALSE;
946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970

  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);
971 972
        event = NULL;
        ret = TRUE;
973 974 975 976 977 978 979
      }
      break;
    }
    default:
      break;
  }

980 981 982 983 984 985
  if (event)
    ret =
        gst_pad_event_default (encoder->srcpad, GST_OBJECT_CAST (encoder),
        event);

  return ret;
986 987 988
}

static gboolean
989
gst_video_encoder_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
990 991 992 993 994
{
  GstVideoEncoder *encoder;
  GstVideoEncoderClass *klass;
  gboolean ret = FALSE;

995
  encoder = GST_VIDEO_ENCODER (parent);
996 997 998 999 1000
  klass = GST_VIDEO_ENCODER_GET_CLASS (encoder);

  GST_LOG_OBJECT (encoder, "handling event: %" GST_PTR_FORMAT, event);

  if (klass->src_event)
1001
    ret = klass->src_event (encoder, event);
1002 1003 1004 1005 1006

  return ret;
}

static gboolean
1007
gst_video_encoder_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
1008 1009 1010 1011 1012
{
  GstVideoEncoderPrivate *priv;
  GstVideoEncoder *enc;
  gboolean res;

1013
  enc = GST_VIDEO_ENCODER (parent);
1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037
  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;

1038
      res = gst_pad_peer_query (enc->sinkpad, query);
1039 1040 1041 1042 1043 1044 1045 1046
      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;
1047 1048 1049 1050
        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;
1051 1052 1053 1054 1055 1056 1057 1058
        }
        GST_OBJECT_UNLOCK (enc);

        gst_query_set_latency (query, live, min_latency, max_latency);
      }
    }
      break;
    default:
1059
      res = gst_pad_query_default (pad, parent, query);
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069
  }
  return res;

error:
  GST_DEBUG_OBJECT (enc, "query failed");
  return res;
}

static GstVideoCodecFrame *
gst_video_encoder_new_frame (GstVideoEncoder * encoder, GstBuffer * buf,
1070
    GstClockTime pts, GstClockTime dts, GstClockTime duration)
1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
{
  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;
1090 1091
  frame->pts = pts;
  frame->dts = dts;
1092 1093 1094 1095 1096 1097 1098
  frame->duration = duration;

  return frame;
}


static GstFlowReturn
1099
gst_video_encoder_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
1100 1101 1102 1103 1104
{
  GstVideoEncoder *encoder;
  GstVideoEncoderPrivate *priv;
  GstVideoEncoderClass *klass;
  GstVideoCodecFrame *frame;
1105
  GstClockTime pts, dts, duration;
1106
  GstFlowReturn ret = GST_FLOW_OK;
1107
  guint64 start, stop, cstart, cstop;
1108

1109
  encoder = GST_VIDEO_ENCODER (parent);
1110 1111 1112 1113 1114 1115 1116
  priv = encoder->priv;
  klass = GST_VIDEO_ENCODER_GET_CLASS (encoder);

  g_return_val_if_fail (klass->handle_frame != NULL, GST_FLOW_ERROR);

  GST_VIDEO_ENCODER_STREAM_LOCK (encoder);

1117 1118 1119
  pts = GST_BUFFER_PTS (buf);
  dts = GST_BUFFER_DTS (buf);
  duration = GST_BUFFER_DURATION (buf);
1120 1121

  GST_LOG_OBJECT (encoder,
1122 1123 1124 1125
      "received buffer of size %" G_GSIZE_FORMAT " with PTS %" GST_TIME_FORMAT
      ", PTS %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
      gst_buffer_get_size (buf), GST_TIME_ARGS (pts), GST_TIME_ARGS (dts),
      GST_TIME_ARGS (duration));
1126 1127

  if (priv->at_eos) {
1128
    ret = GST_FLOW_EOS;
1129 1130 1131
    goto done;
  }

1132 1133 1134 1135 1136 1137
  start = pts;
  if (GST_CLOCK_TIME_IS_VALID (duration))
    stop = start + duration;
  else
    stop = GST_CLOCK_TIME_NONE;

1138 1139 1140 1141 1142 1143 1144 1145
  /* Drop buffers outside of segment */
  if (!gst_segment_clip (&encoder->output_segment,
          GST_FORMAT_TIME, start, stop, &cstart, &cstop)) {
    GST_DEBUG_OBJECT (encoder, "clipping to segment dropped frame");
    gst_buffer_unref (buf);
    goto done;
  }

1146 1147
  frame =
      gst_video_encoder_new_frame (encoder, buf, cstart, dts, cstop - cstart);
1148 1149 1150 1151 1152 1153 1154 1155 1156

  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,
1157
        cstart);
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190

    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);

1191
  gst_video_codec_frame_ref (frame);
1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452
  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;
}

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_set_src_caps (GstVideoEncoder * encoder)
{
  gboolean ret;
  GstVideoCodecState *state = encoder->priv->output_state;
  GstVideoInfo *info = &state->info;

  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);

  return ret;
}

/**
 * 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.
 *
 * Returns: a #GstFlowReturn resulting from sending data downstream
 *
 * Since: 0.10.36
 */
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_VIDEO_ENCODER_STREAM_LOCK (encoder);

  if (G_UNLIKELY (priv->output_state_changed))
    gst_video_encoder_set_src_caps (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;
  }

  /* 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 */
    frame->dts = frame->pts;
  } else {
    GST_BUFFER_FLAG_SET (frame->output_buffer, GST_BUFFER_FLAG_DELTA_UNIT);
  }

  frame->distance_from_sync = priv->distance_from_sync;
  priv->distance_from_sync++;

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  GST_BUFFER_PTS (frame->output_buffer) = frame->pts;
  GST_BUFFER_DTS (frame->output_buffer) = frame->dts;
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  GST_BUFFER_DURATION (frame->output_buffer) = frame->duration;

  /* update rate estimate */
1458
  priv->bytes += gst_buffer_get_size (frame->output_buffer);
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  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);

1475
      copy = g_list_append (copy, gst_buffer_make_writable (tmpbuf));
1476 1477 1478 1479 1480 1481 1482 1483
    }
    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);
1484
      priv->bytes += gst_buffer_get_size (tmpbuf);
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      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);

1504 1505 1506 1507 1508
  /* 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. */
1509
  if (ret == GST_FLOW_OK)
1510
    ret = gst_pad_push (encoder->srcpad, gst_buffer_ref (frame->output_buffer));
1511 1512 1513

done:
  /* handed out */
1514 1515 1516 1517 1518 1519 1520 1521

  /* 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 */
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  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.
 *
 * Since: 0.10.36
 */
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 @decoder 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.
 *
 * Since: 0.10.36
 */
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.
 *
 * Since: 0.10.36
 */
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_ge