gstrtph265depay.c 45.3 KB
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/* GStreamer
 * Copyright (C) <2006> Wim Taymans <wim.taymans@gmail.com>
 * Copyright (C) <2014> Jurgen Slowack <jurgenslowack@gmail.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include <stdio.h>
#include <string.h>

#include <gst/base/gstbitreader.h>
#include <gst/rtp/gstrtpbuffer.h>
#include "gstrtph265depay.h"

GST_DEBUG_CATEGORY_STATIC (rtph265depay_debug);
#define GST_CAT_DEFAULT (rtph265depay_debug)

/* This is what we'll default to when downstream hasn't
 * expressed a restriction or preference via caps */
#define DEFAULT_BYTE_STREAM   TRUE
#define DEFAULT_ACCESS_UNIT   FALSE

/* 3 zero bytes syncword */
static const guint8 sync_bytes[] = { 0, 0, 0, 1 };

static GstStaticPadTemplate gst_rtp_h265_depay_src_template =
    GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (
        /* FIXME - hvc1 and hev1 formats are not supported yet */
        /*"video/x-h265, "
           "stream-format = (string) hvc1, alignment = (string) au; "
           "video/x-h265, "
           "stream-format = (string) hev1, alignment = (string) au; " */
        "video/x-h265, "
        "stream-format = (string) byte-stream, alignment = (string) { nal, au }")
    );

static GstStaticPadTemplate gst_rtp_h265_depay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("application/x-rtp, "
        "media = (string) \"video\", "
        "clock-rate = (int) 90000, " "encoding-name = (string) \"H265\"")
        /** optional parameters **/
    /* "profile-space = (int) [ 0, 3 ], " */
    /* "profile-id = (int) [ 0, 31 ], " */
    /* "tier-flag = (int) [ 0, 1 ], " */
    /* "level-id = (int) [ 0, 255 ], " */
    /* "interop-constraints = (string) ANY, " */
    /* "profile-compatibility-indicator = (string) ANY, " */
    /* "sprop-sub-layer-id = (int) [ 0, 6 ], " */
    /* "recv-sub-layer-id = (int) [ 0, 6 ], " */
    /* "max-recv-level-id = (int) [ 0, 255 ], " */
    /* "tx-mode = (string) {MST , SST}, " */
    /* "sprop-vps = (string) ANY, " */
    /* "sprop-sps = (string) ANY, " */
    /* "sprop-pps = (string) ANY, " */
    /* "sprop-sei = (string) ANY, " */
    /* "max-lsr = (int) ANY, " *//* MUST be in the range of MaxLumaSR to 16 * MaxLumaSR, inclusive */
    /* "max-lps = (int) ANY, " *//* MUST be in the range of MaxLumaPS to 16 * MaxLumaPS, inclusive */
    /* "max-cpb = (int) ANY, " *//* MUST be in the range of MaxCPB to 16 * MaxCPB, inclusive */
    /* "max-dpb = (int) [1, 16], " */
    /* "max-br = (int) ANY, " *//* MUST be in the range of MaxBR to 16 * MaxBR, inclusive, for the highest level */
    /* "max-tr = (int) ANY, " *//* MUST be in the range of MaxTileRows to 16 * MaxTileRows, inclusive, for the highest level */
    /* "max-tc = (int) ANY, " *//* MUST be in the range of MaxTileCols to 16 * MaxTileCols, inclusive, for the highest level */
    /* "max-fps = (int) ANY, " */
    /* "sprop-max-don-diff = (int) [0, 32767], " */
    /* "sprop-depack-buf-nalus = (int) [0, 32767], " */
    /* "sprop-depack-buf-nalus = (int) [0, 4294967295], " */
    /* "depack-buf-cap = (int) [1, 4294967295], " */
    /* "sprop-segmentation-id = (int) [0, 3], " */
    /* "sprop-spatial-segmentation-idc = (string) ANY, " */
    /* "dec-parallel-cap = (string) ANY, " */
    );

#define gst_rtp_h265_depay_parent_class parent_class
G_DEFINE_TYPE (GstRtpH265Depay, gst_rtp_h265_depay,
    GST_TYPE_RTP_BASE_DEPAYLOAD);

static void gst_rtp_h265_depay_finalize (GObject * object);

static GstStateChangeReturn gst_rtp_h265_depay_change_state (GstElement *
    element, GstStateChange transition);

static GstBuffer *gst_rtp_h265_depay_process (GstRTPBaseDepayload * depayload,
    GstBuffer * buf);
static gboolean gst_rtp_h265_depay_setcaps (GstRTPBaseDepayload * filter,
    GstCaps * caps);
static gboolean gst_rtp_h265_depay_handle_event (GstRTPBaseDepayload * depay,
    GstEvent * event);

static void
gst_rtp_h265_depay_class_init (GstRtpH265DepayClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
  GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
  gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;

  gobject_class->finalize = gst_rtp_h265_depay_finalize;

  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&gst_rtp_h265_depay_src_template));
  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&gst_rtp_h265_depay_sink_template));

  gst_element_class_set_static_metadata (gstelement_class,
      "RTP H265 depayloader", "Codec/Depayloader/Network/RTP",
      "Extracts H265 video from RTP packets (draft-ietf-payload-rtp-h265-03.txt)",
      "Jurgen Slowack <jurgenslowack@gmail.com>");
  gstelement_class->change_state = gst_rtp_h265_depay_change_state;

  gstrtpbasedepayload_class->process = gst_rtp_h265_depay_process;
  gstrtpbasedepayload_class->set_caps = gst_rtp_h265_depay_setcaps;
  gstrtpbasedepayload_class->handle_event = gst_rtp_h265_depay_handle_event;
}

static void
gst_rtp_h265_depay_init (GstRtpH265Depay * rtph265depay)
{
  rtph265depay->adapter = gst_adapter_new ();
  rtph265depay->picture_adapter = gst_adapter_new ();
  rtph265depay->byte_stream = DEFAULT_BYTE_STREAM;
  rtph265depay->stream_format = (gchar *) g_malloc (10);
  rtph265depay->merge = DEFAULT_ACCESS_UNIT;
  rtph265depay->vps = g_ptr_array_new_with_free_func (
      (GDestroyNotify) gst_buffer_unref);
  rtph265depay->sps = g_ptr_array_new_with_free_func (
      (GDestroyNotify) gst_buffer_unref);
  rtph265depay->pps = g_ptr_array_new_with_free_func (
      (GDestroyNotify) gst_buffer_unref);
}

static void
gst_rtp_h265_depay_reset (GstRtpH265Depay * rtph265depay)
{
  gst_adapter_clear (rtph265depay->adapter);
  rtph265depay->wait_start = TRUE;
  gst_adapter_clear (rtph265depay->picture_adapter);
  rtph265depay->picture_start = FALSE;
  rtph265depay->last_keyframe = FALSE;
  rtph265depay->last_ts = 0;
  rtph265depay->current_fu_type = 0;
  rtph265depay->new_codec_data = FALSE;
  g_ptr_array_set_size (rtph265depay->vps, 0);
  g_ptr_array_set_size (rtph265depay->sps, 0);
  g_ptr_array_set_size (rtph265depay->pps, 0);
}

static void
gst_rtp_h265_depay_finalize (GObject * object)
{
  GstRtpH265Depay *rtph265depay;

  rtph265depay = GST_RTP_H265_DEPAY (object);

  if (rtph265depay->codec_data)
    gst_buffer_unref (rtph265depay->codec_data);

  g_free (rtph265depay->stream_format);

  g_object_unref (rtph265depay->adapter);
  g_object_unref (rtph265depay->picture_adapter);

  g_ptr_array_free (rtph265depay->vps, TRUE);
  g_ptr_array_free (rtph265depay->sps, TRUE);
  g_ptr_array_free (rtph265depay->pps, TRUE);

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

static void
gst_rtp_h265_depay_negotiate (GstRtpH265Depay * rtph265depay)
{
  GstCaps *caps;
  gint byte_stream = -1;
  gint merge = -1;

  caps =
      gst_pad_get_allowed_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph265depay));

  GST_DEBUG_OBJECT (rtph265depay, "allowed caps: %" GST_PTR_FORMAT, caps);

  if (caps) {
    if (gst_caps_get_size (caps) > 0) {
      GstStructure *s = gst_caps_get_structure (caps, 0);
      const gchar *str = NULL;

      if ((str = gst_structure_get_string (s, "stream-format"))) {

        strcpy (rtph265depay->stream_format, str);

        if (strcmp (str, "hev1") == 0) {
          byte_stream = FALSE;
        } else if (strcmp (str, "hvc1") == 0) {
          byte_stream = FALSE;
        } else if (strcmp (str, "byte-stream") == 0) {
          byte_stream = TRUE;
        } else {
          GST_DEBUG_OBJECT (rtph265depay, "unknown stream-format: %s", str);
        }
      }

      if ((str = gst_structure_get_string (s, "alignment"))) {
        if (strcmp (str, "au") == 0) {
          merge = TRUE;
        } else if (strcmp (str, "nal") == 0) {
          merge = FALSE;
        } else {
          GST_DEBUG_OBJECT (rtph265depay, "unknown alignment: %s", str);
        }
      }
    }
    gst_caps_unref (caps);
  }

  if (byte_stream != -1) {
    GST_DEBUG_OBJECT (rtph265depay, "downstream requires byte-stream %d",
        byte_stream);
    rtph265depay->byte_stream = byte_stream;
  } else {
    GST_DEBUG_OBJECT (rtph265depay, "defaulting to byte-stream %d",
        DEFAULT_BYTE_STREAM);
    strcpy (rtph265depay->stream_format, "byte-stream");
    rtph265depay->byte_stream = DEFAULT_BYTE_STREAM;
  }
  if (merge != -1) {
    GST_DEBUG_OBJECT (rtph265depay, "downstream requires merge %d", merge);
    rtph265depay->merge = merge;
  } else {
    GST_DEBUG_OBJECT (rtph265depay, "defaulting to merge %d",
        DEFAULT_ACCESS_UNIT);
    rtph265depay->merge = DEFAULT_ACCESS_UNIT;
  }
}

/* Stolen from bad/gst/mpegtsdemux/payloader_parsers.c */
/* variable length Exp-Golomb parsing according to H.265 spec section 9.2*/
static gboolean
read_golomb (GstBitReader * br, guint32 * value)
{
  guint8 b, leading_zeros = -1;
  *value = 1;

  for (b = 0; !b; leading_zeros++) {
    if (!gst_bit_reader_get_bits_uint8 (br, &b, 1))
      return FALSE;
    *value *= 2;
  }

  *value = (*value >> 1) - 1;
  if (leading_zeros > 0) {
    guint32 tmp = 0;
    if (!gst_bit_reader_get_bits_uint32 (br, &tmp, leading_zeros))
      return FALSE;
    *value += tmp;
  }

  return TRUE;
}

static gboolean
parse_sps (GstMapInfo * map, guint32 * sps_id)
{                               /* To parse seq_parameter_set_id */
  GstBitReader br = GST_BIT_READER_INIT (map->data + 15,
      map->size - 15);

  if (map->size < 16)
    return FALSE;

  if (!read_golomb (&br, sps_id))
    return FALSE;

  return TRUE;
}

static gboolean
parse_pps (GstMapInfo * map, guint32 * sps_id, guint32 * pps_id)
{                               /* To parse picture_parameter_set_id */
  GstBitReader br = GST_BIT_READER_INIT (map->data + 2,
      map->size - 2);

  if (map->size < 3)
    return FALSE;

  if (!read_golomb (&br, pps_id))
    return FALSE;
  if (!read_golomb (&br, sps_id))
    return FALSE;

  return TRUE;
}


static gboolean
gst_rtp_h265_set_src_caps (GstRtpH265Depay * rtph265depay)
{
  gboolean res;
  GstCaps *srccaps;

  if (!rtph265depay->byte_stream &&
      (!rtph265depay->new_codec_data ||
          rtph265depay->vps->len == 0 || rtph265depay->sps->len == 0
          || rtph265depay->pps->len == 0))
    return TRUE;

  srccaps = gst_caps_new_simple ("video/x-h265",
      "stream-format", G_TYPE_STRING,
      rtph265depay->stream_format,
      "alignment", G_TYPE_STRING, rtph265depay->merge ? "au" : "nal", NULL);

  if (!rtph265depay->byte_stream) {

    GstBuffer *codec_data;
    gint i = 0;
    gint len;
    guint num_vps = rtph265depay->vps->len;
    guint num_sps = rtph265depay->sps->len;
    guint num_pps = rtph265depay->pps->len;
    GstMapInfo map, nalmap;
    guint8 *data;
    gint nl;
    guint8 num_arrays = 0;
    guint new_size;
    GstBitReader br;
    guint32 tmp;
    guint8 tmp8 = 0;
    guint32 max_sub_layers_minus1, temporal_id_nesting_flag, chroma_format_idc,
        bit_depth_luma_minus8, bit_depth_chroma_minus8,
        min_spatial_segmentation_idc;

    /* Fixme: Current implementation is not embedding SEI in codec_data */

    if (num_sps == 0)
      return FALSE;

    /* start with 23 bytes header */
    len = 23;

    num_arrays = (num_vps > 0) + (num_sps > 0) + (num_pps > 0);
    len += num_arrays;

    /* add size of vps, sps & pps */
    for (i = 0; i < num_vps; i++)
      len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph265depay->vps, i));
    for (i = 0; i < num_sps; i++)
      len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph265depay->sps, i));
    for (i = 0; i < num_pps; i++)
      len += 2 + gst_buffer_get_size (g_ptr_array_index (rtph265depay->pps, i));

    GST_DEBUG_OBJECT (rtph265depay,
        "constructing codec_data: num_vps =%d num_sps=%d, num_pps=%d", num_vps,
        num_sps, num_pps);

    codec_data = gst_buffer_new_and_alloc (len);
    g_debug ("alloc_len: %u", len);
    gst_buffer_map (codec_data, &map, GST_MAP_READWRITE);
    data = map.data;

    memset (data, 0, map.size);

    /* Parsing sps to get the info required further on */

    gst_buffer_map (g_ptr_array_index (rtph265depay->sps, 0), &nalmap,
        GST_MAP_READ);

    max_sub_layers_minus1 = ((nalmap.data[2]) >> 1) & 0x07;
    temporal_id_nesting_flag = nalmap.data[2] & 0x01;

    gst_bit_reader_init (&br, nalmap.data + 15, nalmap.size - 15);

    read_golomb (&br, &tmp);    /* sps_seq_parameter_set_id */
    read_golomb (&br, &chroma_format_idc);      /* chroma_format_idc */

    if (chroma_format_idc == 3)

      gst_bit_reader_get_bits_uint8 (&br, &tmp8, 1);    /* separate_colour_plane_flag */

    read_golomb (&br, &tmp);    /* pic_width_in_luma_samples */
    read_golomb (&br, &tmp);    /* pic_height_in_luma_samples */

    gst_bit_reader_get_bits_uint8 (&br, &tmp8, 1);      /* conformance_window_flag */
    if (tmp8) {
      read_golomb (&br, &tmp);  /* conf_win_left_offset */
      read_golomb (&br, &tmp);  /* conf_win_right_offset */
      read_golomb (&br, &tmp);  /* conf_win_top_offset */
      read_golomb (&br, &tmp);  /* conf_win_bottom_offset */
    }

    read_golomb (&br, &bit_depth_luma_minus8);  /* bit_depth_luma_minus8 */
    read_golomb (&br, &bit_depth_chroma_minus8);        /* bit_depth_chroma_minus8 */

    GST_DEBUG_OBJECT (rtph265depay,
        "Ignoring min_spatial_segmentation for now (assuming zero)");

    min_spatial_segmentation_idc = 0;   /* NOTE - we ignore this for now, but in a perfect world, we should continue parsing to obtain the real value */

    nl = nalmap.size;

    gst_buffer_unmap (g_ptr_array_index (rtph265depay->sps, 0), &nalmap);

    /* HEVCDecoderConfigurationVersion = 1 */
    data[0] = 1;

    /* Copy from profile_tier_level (Rec. ITU-T H.265 (04/2013) section 7.3.3
     *
     * profile_space | tier_flat | profile_idc |
     * profile_compatibility_flags | constraint_indicator_flags |
     * level_idc | progressive_source_flag | interlaced_source_flag
     * non_packed_constraint_flag | frame_only_constraint_flag
     * reserved_zero_44bits | level_idc */
    gst_buffer_map (g_ptr_array_index (rtph265depay->sps, 0), &nalmap,
        GST_MAP_READ);
    for (i = 0; i < 12; i++)
      data[i + 1] = nalmap.data[i];
    gst_buffer_unmap (g_ptr_array_index (rtph265depay->sps, 0), &nalmap);

    /* min_spatial_segmentation_idc */
    GST_WRITE_UINT16_BE (data + 13, min_spatial_segmentation_idc);
    data[13] |= 0xf0;
    data[15] = 0xfc;            /* keeping parrallelismType as zero (unknown) */
    data[16] = 0xfc | chroma_format_idc;
    data[17] = 0xf8 | bit_depth_luma_minus8;
    data[18] = 0xf8 | bit_depth_chroma_minus8;
    data[19] = 0x00;            /* keep avgFrameRate as unspecified */
    data[20] = 0x00;            /* keep avgFrameRate as unspecified */
    /* constFrameRate(2 bits): 0, stream may or may not be of constant framerate
     * numTemporalLayers (3 bits): number of temporal layers, value from SPS
     * TemporalIdNested (1 bit): sps_temporal_id_nesting_flag from SPS
     * lengthSizeMinusOne (2 bits): plus 1 indicates the length of the NALUnitLength */
    data[21] =
        0x00 | ((max_sub_layers_minus1 +
            1) << 3) | (temporal_id_nesting_flag << 2) | (nl - 1);
    GST_WRITE_UINT8 (data + 22, num_arrays);    /* numOfArrays */

    data += 23;

    /* copy all VPS */
    if (num_vps > 0) {
      /* array_completeness | reserved_zero bit | nal_unit_type */
      data[0] = 0x00 | 0x20;
      data++;

      GST_WRITE_UINT16_BE (data, num_vps);
      data += 2;

      for (i = 0; i < num_vps; i++) {
        gsize nal_size =
            gst_buffer_get_size (g_ptr_array_index (rtph265depay->vps, i));
        GST_WRITE_UINT16_BE (data, nal_size);
        gst_buffer_extract (g_ptr_array_index (rtph265depay->vps, i), 0,
            data + 2, nal_size);
        data += 2 + nal_size;
        GST_DEBUG_OBJECT (rtph265depay, "Copied VPS %d of length %u", i,
            (guint) nal_size);
      }
    }

    /* copy all SPS */
    if (num_sps > 0) {
      /* array_completeness | reserved_zero bit | nal_unit_type */
      data[0] = 0x00 | 0x21;
      data++;

      GST_WRITE_UINT16_BE (data, num_sps);
      data += 2;

      for (i = 0; i < num_sps; i++) {
        gsize nal_size =
            gst_buffer_get_size (g_ptr_array_index (rtph265depay->sps, i));
        GST_WRITE_UINT16_BE (data, nal_size);
        gst_buffer_extract (g_ptr_array_index (rtph265depay->sps, i), 0,
            data + 2, nal_size);
        data += 2 + nal_size;
        GST_DEBUG_OBJECT (rtph265depay, "Copied SPS %d of length %u", i,
            (guint) nal_size);
      }
    }

    /* copy all PPS */
    if (num_pps > 0) {
      /* array_completeness | reserved_zero bit | nal_unit_type */
      data[0] = 0x00 | 0x22;
      data++;

      GST_WRITE_UINT16_BE (data, num_pps);
      data += 2;

      for (i = 0; i < num_pps; i++) {
        gsize nal_size =
            gst_buffer_get_size (g_ptr_array_index (rtph265depay->pps, i));
        GST_WRITE_UINT16_BE (data, nal_size);
        gst_buffer_extract (g_ptr_array_index (rtph265depay->pps, i), 0,
            data + 2, nal_size);
        data += 2 + nal_size;
        GST_DEBUG_OBJECT (rtph265depay, "Copied PPS %d of length %u", i,
            (guint) nal_size);
      }
    }

    new_size = data - map.data;
    gst_buffer_unmap (codec_data, &map);
    gst_buffer_set_size (codec_data, new_size);

    gst_caps_set_simple (srccaps,
        "codec_data", GST_TYPE_BUFFER, codec_data, NULL);
    gst_buffer_unref (codec_data);
  }

  res = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (rtph265depay),
      srccaps);
  gst_caps_unref (srccaps);

  if (res)
    rtph265depay->new_codec_data = FALSE;

  return res;
}

gboolean
gst_rtp_h265_add_vps_sps_pps (GstElement * rtph265, GPtrArray * vps_array,
    GPtrArray * sps_array, GPtrArray * pps_array, GstBuffer * nal)
{
  GstMapInfo map;
  guchar type;
  guint i;

  gst_buffer_map (nal, &map, GST_MAP_READ);

  type = (map.data[0] >> 1) & 0x3f;

  if (type == GST_H265_VPS_NUT) {
    guint32 vps_id = (map.data[2] >> 4) & 0x0f;

    for (i = 0; i < vps_array->len; i++) {
      GstBuffer *vps = g_ptr_array_index (vps_array, i);
      GstMapInfo vpsmap;
      guint32 tmp_vps_id;

      gst_buffer_map (vps, &vpsmap, GST_MAP_READ);
      tmp_vps_id = (vpsmap.data[2] >> 4) & 0x0f;

      if (vps_id == tmp_vps_id) {
        if (map.size == vpsmap.size &&
            memcmp (map.data, vpsmap.data, vpsmap.size) == 0) {
          GST_LOG_OBJECT (rtph265, "Unchanged VPS %u, not updating", vps_id);
          gst_buffer_unmap (vps, &vpsmap);
          goto drop;
        } else {
          gst_buffer_unmap (vps, &vpsmap);
          g_ptr_array_remove_index_fast (vps_array, i);
          g_ptr_array_add (vps_array, nal);
          GST_LOG_OBJECT (rtph265, "Modified VPS %u, replacing", vps_id);
          goto done;
        }
      }
      gst_buffer_unmap (vps, &vpsmap);
    }
    GST_LOG_OBJECT (rtph265, "Adding new VPS %u", vps_id);
    g_ptr_array_add (vps_array, nal);
  } else if (type == GST_H265_SPS_NUT) {
    guint32 sps_id;

    if (!parse_sps (&map, &sps_id)) {
      GST_WARNING_OBJECT (rtph265, "Invalid SPS,"
          " can't parse seq_parameter_set_id");
      goto drop;
    }

    for (i = 0; i < sps_array->len; i++) {
      GstBuffer *sps = g_ptr_array_index (sps_array, i);
      GstMapInfo spsmap;
      guint32 tmp_sps_id;

      gst_buffer_map (sps, &spsmap, GST_MAP_READ);
      parse_sps (&spsmap, &tmp_sps_id);

      if (sps_id == tmp_sps_id) {
        if (map.size == spsmap.size &&
            memcmp (map.data, spsmap.data, spsmap.size) == 0) {
          GST_LOG_OBJECT (rtph265, "Unchanged SPS %u, not updating", sps_id);
          gst_buffer_unmap (sps, &spsmap);
          goto drop;
        } else {
          gst_buffer_unmap (sps, &spsmap);
          g_ptr_array_remove_index_fast (sps_array, i);
          g_ptr_array_add (sps_array, nal);
          GST_LOG_OBJECT (rtph265, "Modified SPS %u, replacing", sps_id);
          goto done;
        }
      }
      gst_buffer_unmap (sps, &spsmap);
    }
    GST_LOG_OBJECT (rtph265, "Adding new SPS %u", sps_id);
    g_ptr_array_add (sps_array, nal);
  } else if (type == GST_H265_PPS_NUT) {
    guint32 sps_id;
    guint32 pps_id;

    if (!parse_pps (&map, &sps_id, &pps_id)) {
      GST_WARNING_OBJECT (rtph265, "Invalid PPS,"
          " can't parse seq_parameter_set_id or pic_parameter_set_id");
      goto drop;
    }

    for (i = 0; i < pps_array->len; i++) {
      GstBuffer *pps = g_ptr_array_index (pps_array, i);
      GstMapInfo ppsmap;
      guint32 tmp_sps_id;
      guint32 tmp_pps_id;


      gst_buffer_map (pps, &ppsmap, GST_MAP_READ);
      parse_pps (&ppsmap, &tmp_sps_id, &tmp_pps_id);

      if (sps_id == tmp_sps_id && pps_id == tmp_pps_id) {
        if (map.size == ppsmap.size &&
            memcmp (map.data, ppsmap.data, ppsmap.size) == 0) {
          GST_LOG_OBJECT (rtph265, "Unchanged PPS %u:%u, not updating", sps_id,
              pps_id);
          gst_buffer_unmap (pps, &ppsmap);
          goto drop;
        } else {
          gst_buffer_unmap (pps, &ppsmap);
          g_ptr_array_remove_index_fast (pps_array, i);
          g_ptr_array_add (pps_array, nal);
          GST_LOG_OBJECT (rtph265, "Modified PPS %u:%u, replacing",
              sps_id, pps_id);
          goto done;
        }
      }
      gst_buffer_unmap (pps, &ppsmap);
    }
    GST_LOG_OBJECT (rtph265, "Adding new PPS %u:%i", sps_id, pps_id);
    g_ptr_array_add (pps_array, nal);
  } else {
    goto drop;
  }

done:
  gst_buffer_unmap (nal, &map);

  return TRUE;

drop:
  gst_buffer_unmap (nal, &map);
  gst_buffer_unref (nal);

  return FALSE;
}


static void
gst_rtp_h265_depay_add_vps_sps_pps (GstRtpH265Depay * rtph265depay,
    GstBuffer * nal)
{
  if (gst_rtp_h265_add_vps_sps_pps (GST_ELEMENT (rtph265depay),
          rtph265depay->vps, rtph265depay->sps, rtph265depay->pps, nal))
    rtph265depay->new_codec_data = TRUE;
}

static gboolean
gst_rtp_h265_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
{
  gint clock_rate;
  GstStructure *structure = gst_caps_get_structure (caps, 0);
  GstRtpH265Depay *rtph265depay;
  const gchar *ps;
  GstBuffer *codec_data;
  GstMapInfo map;
  guint8 *ptr;

  rtph265depay = GST_RTP_H265_DEPAY (depayload);

  if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
    clock_rate = 90000;
  depayload->clock_rate = clock_rate;

  /* Base64 encoded, comma separated config NALs */
  ps = gst_structure_get_string (structure, "sprop-parameter-sets");

  /* negotiate with downstream w.r.t. output format and alignment */
  gst_rtp_h265_depay_negotiate (rtph265depay);

  if (rtph265depay->byte_stream && ps != NULL) {
    /* for bytestream we only need the parameter sets but we don't error out
     * when they are not there, we assume they are in the stream. */
    gchar **params;
    guint len, total;
    gint i;

    params = g_strsplit (ps, ",", 0);

    /* count total number of bytes in base64. Also include the sync bytes in
     * front of the params. */
    len = 0;
    for (i = 0; params[i]; i++) {
      len += strlen (params[i]);
      len += sizeof (sync_bytes);
    }
    /* we seriously overshoot the length, but it's fine. */
    codec_data = gst_buffer_new_and_alloc (len);

    gst_buffer_map (codec_data, &map, GST_MAP_WRITE);
    ptr = map.data;
    total = 0;
    for (i = 0; params[i]; i++) {
      guint save = 0;
      gint state = 0;

      GST_DEBUG_OBJECT (depayload, "decoding param %d (%s)", i, params[i]);
      memcpy (ptr, sync_bytes, sizeof (sync_bytes));
      ptr += sizeof (sync_bytes);
      len =
          g_base64_decode_step (params[i], strlen (params[i]), ptr, &state,
          &save);
      GST_DEBUG_OBJECT (depayload, "decoded %d bytes", len);
      total += len + sizeof (sync_bytes);
      ptr += len;
    }
    gst_buffer_unmap (codec_data, &map);
    gst_buffer_resize (codec_data, 0, total);
    g_strfreev (params);

    /* keep the codec_data, we need to send it as the first buffer. We cannot
     * push it in the adapter because the adapter might be flushed on discont.
     */
    if (rtph265depay->codec_data)
      gst_buffer_unref (rtph265depay->codec_data);
    rtph265depay->codec_data = codec_data;
  } else if (!rtph265depay->byte_stream) {
    gchar **params;
    gint i;

    if (ps == NULL)
      goto incomplete_caps;

    params = g_strsplit (ps, ",", 0);

    GST_DEBUG_OBJECT (depayload, "we have %d params", g_strv_length (params));

    /* start with 23 bytes header */
    for (i = 0; params[i]; i++) {
      GstBuffer *nal;
      GstMapInfo nalmap;
      gsize nal_len;
      guint save = 0;
      gint state = 0;

      nal_len = strlen (params[i]);
      nal = gst_buffer_new_and_alloc (nal_len);
      gst_buffer_map (nal, &nalmap, GST_MAP_READWRITE);

      nal_len =
          g_base64_decode_step (params[i], nal_len, nalmap.data, &state, &save);

      GST_DEBUG_OBJECT (depayload, "adding param %d as %s", i,
          (((nalmap.data[0] >> 1) & 0x3f) ==
              32) ? "VPS" : (((nalmap.data[0] >> 1) & 0x3f) ==
              33) ? "SPS" : "PPS");

      gst_buffer_unmap (nal, &nalmap);
      gst_buffer_set_size (nal, nal_len);

      gst_rtp_h265_depay_add_vps_sps_pps (rtph265depay, nal);
    }
    g_strfreev (params);

    if (rtph265depay->sps->len == 0 || rtph265depay->pps->len == 0)
      goto incomplete_caps;
  }

  return gst_rtp_h265_set_src_caps (rtph265depay);

  /* ERRORS */
incomplete_caps:
  {
    GST_DEBUG_OBJECT (depayload, "we have incomplete caps,"
        " doing setcaps later");
    return TRUE;
  }
}

static GstBuffer *
gst_rtp_h265_complete_au (GstRtpH265Depay * rtph265depay,
    GstClockTime * out_timestamp, gboolean * out_keyframe)
{
  guint outsize;
  GstBuffer *outbuf;

  /* we had a picture in the adapter and we completed it */
  GST_DEBUG_OBJECT (rtph265depay, "taking completed AU");
  outsize = gst_adapter_available (rtph265depay->picture_adapter);
  outbuf = gst_adapter_take_buffer (rtph265depay->picture_adapter, outsize);

  *out_timestamp = rtph265depay->last_ts;
  *out_keyframe = rtph265depay->last_keyframe;

  rtph265depay->last_keyframe = FALSE;
  rtph265depay->picture_start = FALSE;

  return outbuf;
}

/* VPS/SPS/PPS/RADL/TSA/RASL/IDR/CRA is considered key, all others DELTA;
 * so downstream waiting for keyframe can pick up at VPS/SPS/PPS/IDR */

#define NAL_TYPE_IS_PARAMETER_SET(nt) (		((nt) == GST_H265_VPS_NUT)\
										||  ((nt) == GST_H265_SPS_NUT)\
										||  ((nt) == GST_H265_PPS_NUT)				)

#define NAL_TYPE_IS_CODED_SLICE_SEGMENT(nt) (		((nt) == GST_H265_NAL_SLICE_TRAIL_N)\
												|| 	((nt) == GST_H265_NAL_SLICE_TRAIL_R)\
												||  ((nt) == GST_H265_NAL_SLICE_TSA_N)\
												||  ((nt) == GST_H265_NAL_SLICE_TSA_R)\
												||  ((nt) == GST_H265_NAL_SLICE_STSA_N)\
												||  ((nt) == GST_H265_NAL_SLICE_STSA_R)\
												||  ((nt) == GST_H265_NAL_SLICE_RASL_N)\
												||  ((nt) == GST_H265_NAL_SLICE_RASL_R)\
												||  ((nt) == GST_H265_NAL_SLICE_BLA_W_LP)\
												||  ((nt) == GST_H265_NAL_SLICE_BLA_W_RADL)\
												||  ((nt) == GST_H265_NAL_SLICE_BLA_N_LP)\
												||  ((nt) == GST_H265_NAL_SLICE_IDR_W_RADL)\
												||  ((nt) == GST_H265_NAL_SLICE_IDR_N_LP)\
												||  ((nt) == GST_H265_NAL_SLICE_CRA_NUT)		)

#define NAL_TYPE_IS_KEY(nt) (NAL_TYPE_IS_PARAMETER_SET(nt) || NAL_TYPE_IS_CODED_SLICE_SEGMENT(nt))

static GstBuffer *
gst_rtp_h265_depay_handle_nal (GstRtpH265Depay * rtph265depay, GstBuffer * nal,
    GstClockTime in_timestamp, gboolean marker)
{
  GstRTPBaseDepayload *depayload = GST_RTP_BASE_DEPAYLOAD (rtph265depay);
  gint nal_type;
  GstMapInfo map;
  GstBuffer *outbuf = NULL;
  GstClockTime out_timestamp;
  gboolean keyframe, out_keyframe;

  gst_buffer_map (nal, &map, GST_MAP_READ);
  if (G_UNLIKELY (map.size < 5))
    goto short_nal;

  nal_type = (map.data[4] >> 1) & 0x3f;
  GST_DEBUG_OBJECT (rtph265depay, "handle NAL type %d (RTP marker bit %d)",
      nal_type, marker);

  keyframe = NAL_TYPE_IS_KEY (nal_type);

  out_keyframe = keyframe;
  out_timestamp = in_timestamp;

  if (!rtph265depay->byte_stream) {
    if (NAL_TYPE_IS_PARAMETER_SET (nal_type)) {
      gst_rtp_h265_depay_add_vps_sps_pps (rtph265depay,
          gst_buffer_copy_region (nal, GST_BUFFER_COPY_ALL,
              4, gst_buffer_get_size (nal) - 4));
      gst_buffer_unmap (nal, &map);
      gst_buffer_unref (nal);
      return NULL;
    } else if (rtph265depay->sps->len == 0 || rtph265depay->pps->len == 0) {
      /* Down push down any buffer in non-bytestream mode if the SPS/PPS haven't
       * go through yet
       */
      gst_pad_push_event (GST_RTP_BASE_DEPAYLOAD_SINKPAD (depayload),
          gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM,
              gst_structure_new ("GstForceKeyUnit",
                  "all-headers", G_TYPE_BOOLEAN, TRUE, NULL)));
      gst_buffer_unmap (nal, &map);
      gst_buffer_unref (nal);
      return NULL;
    }

    if (rtph265depay->new_codec_data &&
        rtph265depay->sps->len > 0 && rtph265depay->pps->len > 0)
      gst_rtp_h265_set_src_caps (rtph265depay);
  }

  if (rtph265depay->merge) {
    gboolean start = FALSE, complete = FALSE;

    /* marker bit isn't mandatory so in the following code we try to detect
     * an AU boundary (see H.265 spec section 7.4.2.4.4) */
    if (!marker) {

      if (NAL_TYPE_IS_CODED_SLICE_SEGMENT (nal_type)) {
        /* A NAL unit (X) ends an access unit if the next-occurring VCL NAL unit (Y) has the high-order bit of the first byte after its NAL unit header equal to 1 */
        start = TRUE;
        if (((map.data[6] >> 7) & 0x01) == 1) {
          complete = TRUE;
        }
        complete = TRUE;
      } else if ((nal_type >= 32 && nal_type <= 35)
917 918
          || nal_type == 39 || (nal_type >= 41 && nal_type <= 44)
          || (nal_type >= 48 && nal_type <= 55)) {
919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956
        /* VPS, SPS, PPS, SEI, ... terminate an access unit */
        complete = TRUE;
      }
      GST_DEBUG_OBJECT (depayload, "start %d, complete %d", start, complete);

      if (complete && rtph265depay->picture_start)
        outbuf = gst_rtp_h265_complete_au (rtph265depay, &out_timestamp,
            &out_keyframe);
    }
    /* add to adapter */
    gst_buffer_unmap (nal, &map);

    GST_DEBUG_OBJECT (depayload, "adding NAL to picture adapter");
    gst_adapter_push (rtph265depay->picture_adapter, nal);
    rtph265depay->last_ts = in_timestamp;
    rtph265depay->last_keyframe |= keyframe;
    rtph265depay->picture_start |= start;

    if (marker)
      outbuf = gst_rtp_h265_complete_au (rtph265depay, &out_timestamp,
          &out_keyframe);
  } else {
    /* no merge, output is input nal */
    GST_DEBUG_OBJECT (depayload, "using NAL as output");
    outbuf = nal;
    gst_buffer_unmap (nal, &map);
  }

  if (outbuf) {
    /* prepend codec_data */
    if (rtph265depay->codec_data) {
      GST_DEBUG_OBJECT (depayload, "prepending codec_data");
      outbuf = gst_buffer_append (rtph265depay->codec_data, outbuf);
      rtph265depay->codec_data = NULL;
      out_keyframe = TRUE;
    }
    outbuf = gst_buffer_make_writable (outbuf);

957
    GST_BUFFER_PTS (outbuf) = out_timestamp;
958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045

    if (out_keyframe)
      GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
    else
      GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
  }

  return outbuf;

  /* ERRORS */
short_nal:
  {
    GST_WARNING_OBJECT (depayload, "dropping short NAL");
    gst_buffer_unmap (nal, &map);
    gst_buffer_unref (nal);
    return NULL;
  }
}

static GstBuffer *
gst_rtp_h265_push_fragmentation_unit (GstRtpH265Depay * rtph265depay,
    gboolean send)
{
  guint outsize;
  GstMapInfo map;
  GstBuffer *outbuf;

  outsize = gst_adapter_available (rtph265depay->adapter);
  outbuf = gst_adapter_take_buffer (rtph265depay->adapter, outsize);

  gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
  GST_DEBUG_OBJECT (rtph265depay, "output %d bytes", outsize);

  if (rtph265depay->byte_stream) {
    memcpy (map.data, sync_bytes, sizeof (sync_bytes));
  } else {
    goto not_implemented;
  }
  gst_buffer_unmap (outbuf, &map);

  rtph265depay->current_fu_type = 0;

  outbuf = gst_rtp_h265_depay_handle_nal (rtph265depay, outbuf,
      rtph265depay->fu_timestamp, rtph265depay->fu_marker);

  if (send && outbuf) {
    gst_rtp_base_depayload_push (GST_RTP_BASE_DEPAYLOAD (rtph265depay), outbuf);
    outbuf = NULL;
  }
  return outbuf;

not_implemented:
  {
    GST_ERROR_OBJECT (rtph265depay,
        ("Only bytestream format is currently supported."));
    gst_buffer_unmap (outbuf, &map);
    return NULL;
  }
}

static GstBuffer *
gst_rtp_h265_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
{
  GstRtpH265Depay *rtph265depay;
  GstBuffer *outbuf = NULL;
  guint8 nal_unit_type;
  GstRTPBuffer rtp = { NULL };

  rtph265depay = GST_RTP_H265_DEPAY (depayload);

  /* flush remaining data on discont */
  if (GST_BUFFER_IS_DISCONT (buf)) {
    gst_adapter_clear (rtph265depay->adapter);
    rtph265depay->wait_start = TRUE;
    rtph265depay->current_fu_type = 0;
  }

  {
    gint payload_len;
    guint8 *payload;
    guint header_len;
    GstMapInfo map;
    guint outsize, nalu_size;
    GstClockTime timestamp;
    gboolean marker;
    guint8 nuh_layer_id, nuh_temporal_id_plus1;
    guint8 S, E;
    guint16 nal_header;
1046 1047 1048
#if 0
    gboolean donl_present = FALSE;
#endif
1049

1050
    timestamp = GST_BUFFER_PTS (buf);
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132

    gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);

    payload_len = gst_rtp_buffer_get_payload_len (&rtp);
    payload = gst_rtp_buffer_get_payload (&rtp);
    marker = gst_rtp_buffer_get_marker (&rtp);

    GST_DEBUG_OBJECT (rtph265depay, "receiving %d bytes", payload_len);

    if (payload_len == 0)
      goto empty_packet;

    /* +---------------+---------------+
     * |0|1|2|3|4|5|6|7|0|1|2|3|4|5|6|7|
     * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     * |F|   Type    |  LayerId  | TID |
     * +-------------+-----------------+
     *
     * F must be 0.
     *
     */
    nal_unit_type = (payload[0] >> 1) & 0x3f;
    nuh_layer_id = ((payload[0] & 0x01) << 5) | (payload[1] >> 3);      /* should be zero for now but this could change in future HEVC extensions */
    nuh_temporal_id_plus1 = payload[1] & 0x03;

    /* At least two byte header with type */
    header_len = 2;

    GST_DEBUG_OBJECT (rtph265depay,
        "NAL header nal_unit_type %d, nuh_temporal_id_plus1 %d", nal_unit_type,
        nuh_temporal_id_plus1);

    GST_FIXME_OBJECT (rtph265depay, "Assuming DONL field is not present");

    /* FIXME - assuming DONL field is not present for now */
    /*donl_present = (tx-mode == "MST") || (sprop-max-don-diff > 0); */

    /* If FU unit was being processed, but the current nal is of a different
     * type.  Assume that the remote payloader is buggy (didn't set the end bit
     * when the FU ended) and send out what we gathered thusfar */
    if (G_UNLIKELY (rtph265depay->current_fu_type != 0 &&
            nal_unit_type != rtph265depay->current_fu_type))
      gst_rtp_h265_push_fragmentation_unit (rtph265depay, TRUE);

    switch (nal_unit_type) {
      case 48:
      {
        GST_DEBUG_OBJECT (rtph265depay, "Processing aggregation packet");

        /* Aggregation packet (section 4.7) */

        /*  An example of an AP packet containing two aggregation units
           without the DONL and DOND fields

           0                   1                   2                   3
           0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
           |                          RTP Header                           |
           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
           |   PayloadHdr (Type=48)        |         NALU 1 Size           |
           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
           |          NALU 1 HDR           |                               |
           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+         NALU 1 Data           |
           |                   . . .                                       |
           |                                                               |
           +               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
           |  . . .        | NALU 2 Size                   | NALU 2 HDR    |
           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
           | NALU 2 HDR    |                                               |
           +-+-+-+-+-+-+-+-+              NALU 2 Data                      |
           |                   . . .                                       |
           |                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
           |                               :...OPTIONAL RTP padding        |
           +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         */

        /* strip headers */
        payload += header_len;
        payload_len -= header_len;

        rtph265depay->wait_start = FALSE;

1133
#if 0
1134 1135
        if (donl_present)
          goto not_implemented_donl_present;
1136
#endif
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169

        while (payload_len > 2) {

          nalu_size = (payload[0] << 8) | payload[1];

          /* dont include nalu_size */
          if (nalu_size > (payload_len - 2))
            nalu_size = payload_len - 2;

          outsize = nalu_size + sizeof (sync_bytes);
          outbuf = gst_buffer_new_and_alloc (outsize);

          gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
          if (rtph265depay->byte_stream) {
            memcpy (map.data, sync_bytes, sizeof (sync_bytes));
          } else {
            goto not_implemented;
          }

          /* strip NALU size */
          payload += 2;
          payload_len -= 2;

          memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
          gst_buffer_unmap (outbuf, &map);

          gst_adapter_push (rtph265depay->adapter, outbuf);

          payload += nalu_size;
          payload_len -= nalu_size;
        }

        outsize = gst_adapter_available (rtph265depay->adapter);
1170 1171 1172 1173 1174 1175
        if (outsize > 0) {
          outbuf = gst_adapter_take_buffer (rtph265depay->adapter, outsize);
          outbuf =
              gst_rtp_h265_depay_handle_nal (rtph265depay, outbuf, timestamp,
              marker);
        }
1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215
        break;
      }
      case 49:
      {
        GST_DEBUG_OBJECT (rtph265depay, "Processing Fragmentation Unit");

        /* Fragmentation units (FUs)  Section 4.8 */

        /*    The structure of a Fragmentation Unit (FU)
         *
         *    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         |    PayloadHdr (Type=49)       |   FU header   | DONL (cond)   |
         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-|
         | DONL (cond)   |                                               |
         |-+-+-+-+-+-+-+-+                                               |
         |                         FU payload                            |
         |                                                               |
         |                               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         |                               :...OPTIONAL RTP padding        |
         +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
         *
         *
         */

        /* strip headers */
        payload += header_len;
        payload_len -= header_len;

        /* processing FU header */
        S = (payload[0] & 0x80) == 0x80;
        E = (payload[0] & 0x40) == 0x40;

        GST_DEBUG_OBJECT (rtph265depay,
            "FU header with S %d, E %d, nal_unit_type %d", S, E,
            payload[0] & 0x3f);

        if (rtph265depay->wait_start && !S)
          goto waiting_start;

1216
#if 0
1217 1218
        if (donl_present)
          goto not_implemented_donl_present;
1219
#endif
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

        if (S) {

          GST_DEBUG_OBJECT (rtph265depay, "Start of Fragmentation Unit");

          /* If a new FU unit started, while still processing an older one.
           * Assume that the remote payloader is buggy (doesn't set the end
           * bit) and send out what we've gathered thusfar */
          if (G_UNLIKELY (rtph265depay->current_fu_type != 0))
            gst_rtp_h265_push_fragmentation_unit (rtph265depay, TRUE);

          rtph265depay->current_fu_type = nal_unit_type;
          rtph265depay->fu_timestamp = timestamp;

          rtph265depay->wait_start = FALSE;

          /* reconstruct NAL header */
          nal_header =
              ((payload[0] & 0x3f) << 9) | (nuh_layer_id << 3) |
              nuh_temporal_id_plus1;

          /* go back one byte so we can copy the payload + two bytes more in the front which
           * will be overwritten by the nal_header
           */
          payload -= 1;
          payload_len += 1;

          nalu_size = payload_len;
          outsize = nalu_size + sizeof (sync_bytes);
          outbuf = gst_buffer_new_and_alloc (outsize);

          gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
          memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
          map.data[sizeof (sync_bytes)] = nal_header >> 8;
          map.data[sizeof (sync_bytes) + 1] = nal_header & 0xff;
          gst_buffer_unmap (outbuf, &map);

          GST_DEBUG_OBJECT (rtph265depay, "queueing %d bytes", outsize);

          /* and assemble in the adapter */
          gst_adapter_push (rtph265depay->adapter, outbuf);
        } else {

          GST_DEBUG_OBJECT (rtph265depay,
              "Following part of Fragmentation Unit");

          /* strip off FU header byte */
          payload += 1;
          payload_len -= 1;

          outsize = payload_len;
          outbuf = gst_buffer_new_and_alloc (outsize);
          gst_buffer_fill (outbuf, 0, payload, outsize);

          GST_DEBUG_OBJECT (rtph265depay, "queueing %d bytes", outsize);

          /* and assemble in the adapter */
          gst_adapter_push (rtph265depay->adapter, outbuf);
        }

        outbuf = NULL;
        rtph265depay->fu_marker = marker;

        /* if NAL unit ends, flush the adapter */
        if (E) {
          outbuf = gst_rtp_h265_push_fragmentation_unit (rtph265depay, FALSE);
          GST_DEBUG_OBJECT (rtph265depay, "End of Fragmentation Unit");
        }
        break;
      }
      case 50:
        goto not_implemented;   /* PACI packets  Section 4.9 */
      default:
      {
        rtph265depay->wait_start = FALSE;

        /* All other cases: Single NAL unit packet   Section 4.6 */
        /* the entire payload is the output buffer */

1299
#if 0
1300 1301
        if (donl_present)
          goto not_implemented_donl_present;
1302
#endif
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

        nalu_size = payload_len;
        outsize = nalu_size + sizeof (sync_bytes);
        outbuf = gst_buffer_new_and_alloc (outsize);

        gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
        if (rtph265depay->byte_stream) {
          memcpy (map.data, sync_bytes, sizeof (sync_bytes));
        } else {
          goto not_implemented;
        }
        memcpy (map.data + sizeof (sync_bytes), payload, nalu_size);
        gst_buffer_unmap (outbuf, &map);

        outbuf = gst_rtp_h265_depay_handle_nal (rtph265depay, outbuf, timestamp,
            marker);
        break;
      }
    }
    gst_rtp_buffer_unmap (&rtp);
  }

  return outbuf;

  /* ERRORS */
empty_packet:
  {
    GST_DEBUG_OBJECT (rtph265depay, "empty packet");
    gst_rtp_buffer_unmap (&rtp);
    return NULL;
  }
waiting_start:
  {
    GST_DEBUG_OBJECT (rtph265depay, "waiting for start");
    gst_rtp_buffer_unmap (&rtp);
    return NULL;
  }
1340
#if 0
1341 1342 1343 1344 1345 1346 1347
not_implemented_donl_present:
  {
    GST_ELEMENT_ERROR (rtph265depay, STREAM, FORMAT,
        (NULL), ("DONL field present not supported yet"));
    gst_rtp_buffer_unmap (&rtp);
    return NULL;
  }
1348
#endif
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
not_implemented:
  {
    GST_ELEMENT_ERROR (rtph265depay, STREAM, FORMAT,
        (NULL), ("NAL unit type %d not supported yet", nal_unit_type));
    gst_rtp_buffer_unmap (&rtp);
    return NULL;
  }
}

static gboolean
gst_rtp_h265_depay_handle_event (GstRTPBaseDepayload * depay, GstEvent * event)
{
  GstRtpH265Depay *rtph265depay;

  rtph265depay = GST_RTP_H265_DEPAY (depay);

  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_FLUSH_STOP:
      gst_rtp_h265_depay_reset (rtph265depay);
      break;
    default:
      break;
  }

  return
      GST_RTP_BASE_DEPAYLOAD_CLASS (parent_class)->handle_event (depay, event);
}

static GstStateChangeReturn
gst_rtp_h265_depay_change_state (GstElement * element,
    GstStateChange transition)
{
  GstRtpH265Depay *rtph265depay;
  GstStateChangeReturn ret;

  rtph265depay = GST_RTP_H265_DEPAY (element);

  switch (transition) {
    case GST_STATE_CHANGE_NULL_TO_READY:
      break;
    case GST_STATE_CHANGE_READY_TO_PAUSED:
      gst_rtp_h265_depay_reset (rtph265depay);
      break;
    default:
      break;
  }

  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);

  switch (transition) {
    case GST_STATE_CHANGE_READY_TO_NULL:
      break;
    default:
      break;
  }
  return ret;
}

gboolean
gst_rtp_h265_depay_plugin_init (GstPlugin * plugin)
{
  GST_DEBUG_CATEGORY_INIT (rtph265depay_debug, "rtph265depay", 0,
      "H265 Video RTP Depayloader");

  return gst_element_register (plugin, "rtph265depay",
      GST_RANK_SECONDARY, GST_TYPE_RTP_H265_DEPAY);
}