gstvideoencoder.c 52.9 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;
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  GstAllocator *allocator;
  GstAllocationParams params;
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};

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_decide_allocation_default (GstVideoEncoder *
    encoder, GstQuery * query);
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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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  klass->decide_allocation = gst_video_encoder_decide_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.
 */
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
 */
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);

672
      filter_caps = gst_caps_merge_structure (filter_caps, s);
673 674 675 676 677
    }
  }

  fcaps = gst_caps_intersect (filter_caps, templ_caps);
  gst_caps_unref (filter_caps);
678 679 680 681 682 683 684 685
  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;
  }
686 687 688 689 690 691 692 693 694 695

done:
  gst_caps_replace (&allowed, NULL);

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

  return fcaps;
}

static GstCaps *
696
gst_video_encoder_sink_getcaps (GstVideoEncoder * encoder, GstCaps * filter)
697 698 699 700 701 702 703
{
  GstVideoEncoderClass *klass;
  GstCaps *caps;

  klass = GST_VIDEO_ENCODER_GET_CLASS (encoder);

  if (klass->getcaps)
704
    caps = klass->getcaps (encoder, filter);
705
  else
706
    caps = gst_video_encoder_proxy_getcaps (encoder, NULL, filter);
707 708 709 710 711 712

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

  return caps;
}

713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742
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;
}

743 744 745 746 747 748
static gboolean
gst_video_encoder_propose_allocation_default (GstVideoEncoder * encoder,
    GstQuery * query)
{
  return TRUE;
}
749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770

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;
    }
771 772 773 774 775 776 777 778
    case GST_QUERY_ALLOCATION:
    {
      GstVideoEncoderClass *klass = GST_VIDEO_ENCODER_GET_CLASS (encoder);

      if (klass->propose_allocation)
        res = klass->propose_allocation (encoder, query);
      break;
    }
779 780 781 782 783 784 785
    default:
      res = gst_pad_query_default (pad, parent, query);
      break;
  }
  return res;
}

786 787 788 789 790 791 792 793 794 795 796 797
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);
  }
798
  g_rec_mutex_clear (&encoder->stream_lock);
799

800 801 802 803 804
  if (encoder->priv->allocator) {
    gst_object_unref (encoder->priv->allocator);
    encoder->priv->allocator = NULL;
  }

805 806 807 808 809 810 811
  G_OBJECT_CLASS (parent_class)->finalize (object);
}

static gboolean
gst_video_encoder_push_event (GstVideoEncoder * encoder, GstEvent * event)
{
  switch (GST_EVENT_TYPE (event)) {
812
    case GST_EVENT_SEGMENT:
813
    {
814
      GstSegment segment;
815 816 817

      GST_VIDEO_ENCODER_STREAM_LOCK (encoder);

818
      gst_event_copy_segment (event, &segment);
819

820 821 822 823
      GST_DEBUG_OBJECT (encoder, "segment %" GST_SEGMENT_FORMAT, &segment);

      if (segment.format != GST_FORMAT_TIME) {
        GST_DEBUG_OBJECT (encoder, "received non TIME segment");
824 825 826 827
        GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
        break;
      }

828
      encoder->output_segment = segment;
829 830 831 832 833 834 835 836 837 838 839
      GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
      break;
    }
    default:
      break;
  }

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

static gboolean
840 841
gst_video_encoder_sink_event_default (GstVideoEncoder * encoder,
    GstEvent * event)
842 843 844 845 846 847 848
{
  GstVideoEncoderClass *encoder_class;
  gboolean ret = FALSE;

  encoder_class = GST_VIDEO_ENCODER_GET_CLASS (encoder);

  switch (GST_EVENT_TYPE (event)) {
849 850 851 852 853 854 855
    case GST_EVENT_CAPS:
    {
      GstCaps *caps;

      gst_event_parse_caps (event, &caps);
      ret = gst_video_encoder_setcaps (encoder, caps);
      gst_event_unref (event);
856
      event = NULL;
857 858
      break;
    }
859 860 861 862 863 864 865 866 867 868 869 870 871
    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;
      }

872
      ret = (flow_ret == GST_FLOW_OK);
873 874 875
      GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
      break;
    }
876
    case GST_EVENT_SEGMENT:
877
    {
878
      GstSegment segment;
879 880 881

      GST_VIDEO_ENCODER_STREAM_LOCK (encoder);

882 883 884
      gst_event_copy_segment (event, &segment);

      GST_DEBUG_OBJECT (encoder, "segment %" GST_SEGMENT_FORMAT, &segment);
885

886
      if (segment.format != GST_FORMAT_TIME) {
887 888 889 890 891 892 893
        GST_DEBUG_OBJECT (encoder, "received non TIME newsegment");
        GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
        break;
      }

      encoder->priv->at_eos = FALSE;

894
      encoder->input_segment = segment;
895
      ret = TRUE;
896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921
      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);
922
        event = NULL;
923 924 925 926 927 928 929 930
        ret = TRUE;
      }
      break;
    }
    default:
      break;
  }

931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950
  /* 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);
951
      ret = TRUE;
952 953 954
    }
  }

955 956 957 958
  return ret;
}

static gboolean
959 960
gst_video_encoder_sink_event (GstPad * pad, GstObject * parent,
    GstEvent * event)
961 962 963 964 965
{
  GstVideoEncoder *enc;
  GstVideoEncoderClass *klass;
  gboolean ret = TRUE;

966
  enc = GST_VIDEO_ENCODER (parent);
967 968 969 970 971 972
  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)
973
    ret = klass->sink_event (enc, event);
974 975 976 977 978

  return ret;
}

static gboolean
979 980
gst_video_encoder_src_event_default (GstVideoEncoder * encoder,
    GstEvent * event)
981
{
982
  gboolean ret = FALSE;
983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007

  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);
1008 1009
        event = NULL;
        ret = TRUE;
1010 1011 1012 1013 1014 1015 1016
      }
      break;
    }
    default:
      break;
  }

1017 1018 1019 1020 1021 1022
  if (event)
    ret =
        gst_pad_event_default (encoder->srcpad, GST_OBJECT_CAST (encoder),
        event);

  return ret;
1023 1024 1025
}

static gboolean
1026
gst_video_encoder_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1027 1028 1029 1030 1031
{
  GstVideoEncoder *encoder;
  GstVideoEncoderClass *klass;
  gboolean ret = FALSE;

1032
  encoder = GST_VIDEO_ENCODER (parent);
1033 1034 1035 1036 1037
  klass = GST_VIDEO_ENCODER_GET_CLASS (encoder);

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

  if (klass->src_event)
1038
    ret = klass->src_event (encoder, event);
1039 1040 1041 1042 1043

  return ret;
}

static gboolean
1044
gst_video_encoder_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
1045 1046 1047 1048 1049
{
  GstVideoEncoderPrivate *priv;
  GstVideoEncoder *enc;
  gboolean res;

1050
  enc = GST_VIDEO_ENCODER (parent);
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074
  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;

1075
      res = gst_pad_peer_query (enc->sinkpad, query);
1076 1077 1078 1079 1080 1081 1082 1083
      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;
1084 1085 1086 1087
        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;
1088 1089 1090 1091 1092 1093 1094 1095
        }
        GST_OBJECT_UNLOCK (enc);

        gst_query_set_latency (query, live, min_latency, max_latency);
      }
    }
      break;
    default:
1096
      res = gst_pad_query_default (pad, parent, query);
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106
  }
  return res;

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

static GstVideoCodecFrame *
gst_video_encoder_new_frame (GstVideoEncoder * encoder, GstBuffer * buf,
1107
    GstClockTime pts, GstClockTime dts, GstClockTime duration)
1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126
{
  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;
1127 1128
  frame->pts = pts;
  frame->dts = dts;
1129 1130 1131 1132 1133 1134 1135
  frame->duration = duration;

  return frame;
}


static GstFlowReturn
1136
gst_video_encoder_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
1137 1138 1139 1140 1141
{
  GstVideoEncoder *encoder;
  GstVideoEncoderPrivate *priv;
  GstVideoEncoderClass *klass;
  GstVideoCodecFrame *frame;
1142
  GstClockTime pts, dts, duration;
1143
  GstFlowReturn ret = GST_FLOW_OK;
1144
  guint64 start, stop, cstart, cstop;
1145

1146
  encoder = GST_VIDEO_ENCODER (parent);
1147 1148 1149 1150 1151 1152 1153
  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);

1154 1155 1156
  pts = GST_BUFFER_PTS (buf);
  dts = GST_BUFFER_DTS (buf);
  duration = GST_BUFFER_DURATION (buf);
1157 1158

  GST_LOG_OBJECT (encoder,
1159 1160 1161 1162
      "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));
1163 1164

  if (priv->at_eos) {
1165
    ret = GST_FLOW_EOS;
1166 1167 1168
    goto done;
  }

1169 1170 1171 1172 1173 1174
  start = pts;
  if (GST_CLOCK_TIME_IS_VALID (duration))
    stop = start + duration;
  else
    stop = GST_CLOCK_TIME_NONE;

1175 1176 1177 1178 1179 1180 1181 1182
  /* 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;
  }

1183 1184
  frame =
      gst_video_encoder_new_frame (encoder, buf, cstart, dts, cstop - cstart);
1185 1186 1187 1188 1189 1190 1191 1192 1193

  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,
1194
        cstart);
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

    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);

1228
  gst_video_codec_frame_ref (frame);
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
  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;
  }
}

1320 1321 1322 1323 1324 1325 1326 1327 1328 1329
/**
 * 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)
1330
{
1331 1332 1333
  GstVideoEncoderClass *klass = GST_VIDEO_ENCODER_GET_CLASS (encoder);
  GstAllocator *allocator;
  GstAllocationParams params;
1334 1335 1336
  gboolean ret;
  GstVideoCodecState *state = encoder->priv->output_state;
  GstVideoInfo *info = &state->info;
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  GstQuery *query = NULL;
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  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);
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  if (!ret)
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    goto done;
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  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);
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  return ret;
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  /* Errors */
no_decide_allocation:
  {
    GST_WARNING_OBJECT (encoder, "Subclass failed to decide allocation");
    goto done;
  }
}

/**
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 * gst_video_encoder_allocate_output_buffer:
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 * @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 *
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gst_video_encoder_allocate_output_buffer (GstVideoEncoder * encoder, gsize size)
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{
  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))))
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    gst_video_encoder_negotiate (encoder);
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  buffer =
      gst_buffer_new_allocate (encoder->priv->allocator, size,
      &encoder->priv->params);

  GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);

  return buffer;
}

/**
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 * gst_video_encoder_allocate_output_frame:
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 * @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
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gst_video_encoder_allocate_output_frame (GstVideoEncoder *
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    encoder, GstVideoCodecFrame * frame, gsize size)
{
  g_return_val_if_fail (frame->output_buffer == NULL, GST_FLOW_ERROR);
  g_return_val_if_fail (size > 0, GST_FLOW_ERROR);

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  GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
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  if (G_UNLIKELY (encoder->priv->output_state_changed
          || (encoder->priv->output_state
              && gst_pad_check_reconfigure (encoder->srcpad))))
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    gst_video_encoder_negotiate (encoder);
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  GST_LOG_OBJECT (encoder, "alloc buffer size %d", 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;
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}

/**
 * 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.
 *
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 * 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.
 *
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 * 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_VIDEO_ENCODER_STREAM_LOCK (encoder);

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  if (G_UNLIKELY (priv->output_state_changed || (priv->output_state
              && gst_pad_check_reconfigure (encoder->srcpad))))
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    gst_video_encoder_negotiate (encoder);
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