/* packet-vp8.c

 * Routines for VP8 dissection

 * Copyright 2014, Owen Williams williams.owen@gmail.com

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 * Copyright 1998 Gerald Combs

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 */

/*

 * RFC 6386 - VP8 Data Format and Decoding Guide

 * RFC 7741 - RTP Payload Format for VP8 Video

 */

#include "config.h"

#include <epan/packet.h>

#include <epan/prefs.h>

#include <epan/expert.h>

#include <epan/tfs.h>

#include <wsutil/array.h>

void proto_reg_handoff_vp8(void);

void proto_register_vp8(void);

#define BIT_1_MASK              0x80

#define BIT_2_MASK              0x40

#define BIT_3_MASK              0x20

#define BIT_4_MASK              0x10

#define BIT_5_MASK              0x08

#define BIT_6_MASK              0x04

#define BIT_7_MASK              0x02

#define BIT_8_MASK              0x01

#define BIT_123_MASK            0xE0

#define BIT_234_MASK            0x70

#define BIT_5678_MASK           0x0F

#define BIT_567_MASK            0x0E

#define BIT_45678_MASK          0x1F

#define BIT_12_MASK             0xC0

#define BIT_NO_MASK             0x0

#define BIT_2BYTE_NO_MASK       0x0

#define BIT_3BYTE_NO_MASK       0x0

#define BIT_EXT_PICTURE_MASK    0x7FFF

#define BIT_PARTITION_SIZE_MASK 0xFFFFE0

static dissector_handle_t vp8_handle;

/* Initialize the protocol and registered fields */

static int proto_vp8;

static int hf_vp8_pld_x_bit;

static int hf_vp8_pld_r_bit;

static int hf_vp8_pld_n_bit;

static int hf_vp8_pld_s_bit;

static int hf_vp8_pld_part_id;

static int hf_vp8_pld_i_bit;

static int hf_vp8_pld_l_bit;

static int hf_vp8_pld_t_bit;

static int hf_vp8_pld_k_bit;

static int hf_vp8_pld_rsv_a;

static int hf_vp8_pld_picture_id;

static int hf_vp8_pld_extended_picture_id;

static int hf_vp8_pld_tl0picidx;

static int hf_vp8_pld_tid;

static int hf_vp8_pld_y_bit;

static int hf_vp8_pld_keyidx;

/* payload header fields */

static int hf_vp8_hdr_frametype;

static int hf_vp8_hdr_version;

static int hf_vp8_hdr_show_bit;

static int hf_vp8_hdr_first_partition_size;

/* keyframe fields */

static int hf_vp8_keyframe_start_code;

static int hf_vp8_keyframe_width;

static int hf_vp8_keyframe_horizontal_scale;

static int hf_vp8_keyframe_height;

static int hf_vp8_keyframe_vertical_scale;

/* Initialize the subtree pointers */

static int ett_vp8;

static int ett_vp8_payload_descriptor;

static int ett_vp8_payload_header;

static int ett_vp8_payload;

static int ett_vp8_keyframe;

static expert_field ei_vp8_startcode;

static expert_field ei_vp8_undecoded;

static expert_field ei_vp8_continuation;

static expert_field ei_vp8_first_partition_split;

static expert_field ei_vp8_first_partition_plus;

static void

dissect_vp8_payload_descriptor(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *vp8_tree, int *offset, bool *hasHeader);

static void

dissect_vp8_payload_header(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *vp8_tree, int *offset, int *frametype, int *partition1_size);

static void

dissect_vp8_payload(tvbuff_t *tvb, packet_info *pinfo, proto_tree *vp8_tree, int *offset, int *frametype, int *partition1_size);

static int *ett[] = {

    &ett_vp8,

    &ett_vp8_payload_descriptor,

    &ett_vp8_payload_header,

    &ett_vp8_payload,

    &ett_vp8_keyframe

};

static const value_string vp8_type_values[] = {

    {  0,   "Keyframe" },

    {  1,   "Interframe" },

    {  2,   "Continuation" },

    {  0, NULL }

};

static const range_string vp8_hdr_version_vals[] = {

    {  0, 0,   "Bicubic  (Loop Filter=Normal)" },

    {  1, 1,   "Bilinear (Loop Filter=Simple)" },

    {  2, 2,   "Bilinear (Loop Filter=None)" },

    {  3, 3,   "No filters" },

    {  4, 7,   "Reserved for future use" },

    {  0, 0,  NULL }

};

static const true_false_string vp8_x_bit_vals = {

    "Extended control bits present (I L T K)",

    "Extended control bits not present"

};

static const true_false_string vp8_r_bit_vals = {

    "Reserved for future use (error: should be zero)",

    "Reserved for future use"

};

static const true_false_string vp8_n_bit_vals = {

    "Non-reference frame",

    "Reference frame"

};

static const true_false_string vp8_s_bit_vals = {

    "Start of VP8 partition",

    "Continuation of VP8 partition"

};

static const true_false_string vp8_i_bit_vals = {

    "Picture ID byte present",

    "No Picture byte ID"

};

static const true_false_string vp8_l_bit_vals = {

    "TL0PICIDX byte present",

    "TL0PICIDX byte not present"

};

static const true_false_string vp8_t_bit_vals = {

    "TID (temporal layer index) present",

    "TID (temporal layer index) not present"

};

static const true_false_string vp8_k_bit_vals = {

    "KEYIDX present",

    "KEYIDX not present"

};

static const true_false_string vp8_hdr_frametype_vals = {

    "interframe",

    "keyframe"

};

static int

dissect_vp8(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)

{

    proto_item *item;

    int offset = 0, frametype = 0, partition1_size = -1;

    proto_tree *vp8_tree;

    bool hasHeader = false;

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "VP8");

    item = proto_tree_add_item(tree, proto_vp8, tvb, 0, -1, ENC_NA);

    vp8_tree = proto_item_add_subtree(item, ett_vp8);

    frametype = 2; /*continuation, will get overridden if there is a payload header*/

    dissect_vp8_payload_descriptor(tvb, pinfo, vp8_tree, &offset, &hasHeader);

    if (hasHeader)

    {

        dissect_vp8_payload_header(tvb, pinfo, vp8_tree, &offset, &frametype, &partition1_size);

    }

    dissect_vp8_payload(tvb, pinfo, vp8_tree, &offset, &frametype, &partition1_size);

    col_append_fstr(pinfo->cinfo, COL_INFO, " - %s",

        val_to_str(pinfo->pool, frametype, vp8_type_values, "Unknown Type (%u)"));

    return tvb_captured_length(tvb);

}

static void

dissect_vp8_payload_descriptor(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *vp8_tree, int *offset, bool *hasHeader)

{

    proto_item *item_descriptor;

    uint8_t     extended_bit, s_bit, partId;

    proto_tree *vp8_payload_descriptor_tree;

/*

The first octets after the RTP header are the VP8 payload descriptor,

   with the following structure.

         0 1 2 3 4 5 6 7

        +-+-+-+-+-+-+-+-+

        |X|R|N|S|R| PID | (REQUIRED), second R bit is parsed as part of PID

        +-+-+-+-+-+-+-+-+

   X:   |I|L|T|K| RSV   | (OPTIONAL)

        +-+-+-+-+-+-+-+-+

   I:   |M|  PictureID  | (OPTIONAL)

        +-+-+-+-+-+-+-+-+

   L:   |   TL0PICIDX   | (OPTIONAL)

        +-+-+-+-+-+-+-+-+

   T/K: |TID|Y| KEYIDX  | (OPTIONAL)

        +-+-+-+-+-+-+-+-+

*/

    vp8_payload_descriptor_tree = proto_tree_add_subtree(vp8_tree, tvb, *offset, -1, ett_vp8_payload_descriptor,

                                                         &item_descriptor, "Payload descriptor");

    proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_x_bit,   tvb, *offset, 1, ENC_BIG_ENDIAN);

    proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_r_bit,   tvb, *offset, 1, ENC_BIG_ENDIAN);

    proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_n_bit,   tvb, *offset, 1, ENC_BIG_ENDIAN);

    proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_s_bit,   tvb, *offset, 1, ENC_BIG_ENDIAN);

    proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_part_id, tvb, *offset, 1, ENC_BIG_ENDIAN);

    extended_bit = tvb_get_uint8(tvb, *offset) & BIT_1_MASK;

    s_bit  = tvb_get_uint8(tvb, *offset) & BIT_4_MASK;

    partId = tvb_get_uint8(tvb, *offset) & BIT_5678_MASK;

    if ((s_bit > 0) && (partId == 0)) {

        *hasHeader=true;

    }

    if (extended_bit)

    {

        uint8_t i_bit, l_bit, t_bit, k_bit;

        (*offset)++;

        proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_i_bit, tvb, *offset, 1, ENC_BIG_ENDIAN);

        proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_l_bit, tvb, *offset, 1, ENC_BIG_ENDIAN);

        proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_t_bit, tvb, *offset, 1, ENC_BIG_ENDIAN);

        proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_k_bit, tvb, *offset, 1, ENC_BIG_ENDIAN);

        proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_rsv_a, tvb, *offset, 1, ENC_BIG_ENDIAN);

        i_bit = tvb_get_uint8(tvb, *offset) & BIT_1_MASK;

        l_bit = tvb_get_uint8(tvb, *offset) & BIT_2_MASK;

        t_bit = tvb_get_uint8(tvb, *offset) & BIT_3_MASK;

        k_bit = tvb_get_uint8(tvb, *offset) & BIT_4_MASK;

        if (i_bit)

        {

            (*offset)++;

            if(tvb_get_uint8(tvb, *offset) & BIT_1_MASK)

            {

                proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_extended_picture_id, tvb, *offset, 2, ENC_BIG_ENDIAN);

                (*offset)++;

            }

            else

            {

                proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_picture_id, tvb, *offset, 1, ENC_BIG_ENDIAN);

            }

        }

        if (l_bit)

        {

            (*offset)++;

            proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_tl0picidx, tvb, *offset, 1, ENC_BIG_ENDIAN);

        }

        if (t_bit || k_bit)

        {

             (*offset)++;

             proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_tid, tvb, *offset, 1, ENC_BIG_ENDIAN);

             proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_y_bit, tvb, *offset, 1, ENC_BIG_ENDIAN);

             proto_tree_add_item(vp8_payload_descriptor_tree, hf_vp8_pld_keyidx, tvb, *offset, 1, ENC_BIG_ENDIAN);

        }

    }

    (*offset)++;

    /* now we know the length of payload descriptor */

    proto_item_set_len(item_descriptor, *offset);

}

static void

dissect_vp8_payload_header(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *vp8_tree, int *offset, int *frametype, int *partition1_size)

{

    proto_item *item_header;

    proto_tree *vp8_payload_header_tree;

    int size0, size1, size2;

/*

The first three octets of an encoded VP8 frame are referred to as an

   "uncompressed data chunk" in [RFC6386], and co-serve as payload

   header in this RTP format.  The codec bitstream format specifies two

   different variants of the uncompressed data chunk: a 3 octet version

   for interframes and a 10 octet version for key frames.  The first 3

   octets are common to both variants.  In the case of a key frame the

   remaining 7 octets are considered to be part of the remaining payload

   in this RTP format.  Note that the header is present only in packets

   which have the S bit equal to one and the PartID equal to zero in the

   payload descriptor.  Subsequent packets for the same frame do not

   carry the payload header.

      0 1 2 3 4 5 6 7

     +-+-+-+-+-+-+-+-+

     |Size0|H| VER |P|

     +-+-+-+-+-+-+-+-+

     |     Size1     |

     +-+-+-+-+-+-+-+-+

     |     Size2     |

     +-+-+-+-+-+-+-+-+

     | Bytes 4..N of |

     | VP8 payload   |

     :               :

     +-+-+-+-+-+-+-+-+

     | OPTIONAL RTP  |

     | padding       |

     :               :

     +-+-+-+-+-+-+-+-+

*/

    vp8_payload_header_tree = proto_tree_add_subtree(vp8_tree, tvb, *offset, 3, ett_vp8_payload_header, &item_header, "Payload header");

    proto_tree_add_item(vp8_payload_header_tree, hf_vp8_hdr_frametype, tvb, *offset, 1, ENC_BIG_ENDIAN);

    proto_tree_add_item(vp8_payload_header_tree, hf_vp8_hdr_version,   tvb, *offset, 1, ENC_BIG_ENDIAN);

    proto_tree_add_item(vp8_payload_header_tree, hf_vp8_hdr_show_bit,  tvb, *offset, 1, ENC_BIG_ENDIAN);

    *frametype = tvb_get_uint8(tvb, *offset) & BIT_8_MASK;

    size0 = (tvb_get_uint8(tvb, *offset) & BIT_123_MASK) >> 5;

    size1 = tvb_get_uint8(tvb, *offset + 1);

    size2 = tvb_get_uint8(tvb, *offset + 2);

    (*partition1_size) = size0 + (size1*8) + (size2*2048);

    proto_tree_add_uint(vp8_payload_header_tree, hf_vp8_hdr_first_partition_size, tvb, *offset, 3, *partition1_size);

    (*offset) += 3;

}

static void

dissect_vp8_payload(tvbuff_t *tvb, packet_info *pinfo, proto_tree *vp8_tree, int *offset, int *frametype, int *partition1_size)

{

    proto_tree *vp8_payload_tree;

    proto_item *payload_item;

    int remainder;

    vp8_payload_tree = proto_tree_add_subtree(vp8_tree, tvb, *offset, -1, ett_vp8_payload, &payload_item, "Payload");

    if (*frametype == 0)

    {

        uint16_t width, height;

        int start1, start2, start3, horizontal_scale, vertical_scale;

        proto_tree *vp8_keyframe_tree;

        vp8_keyframe_tree = proto_tree_add_subtree(vp8_payload_tree, tvb, *offset, -1, ett_vp8_keyframe, NULL, "Keyframe header");

        proto_tree_add_item(vp8_keyframe_tree, hf_vp8_keyframe_start_code, tvb, *offset, 3, ENC_BIG_ENDIAN);

        start1 = tvb_get_uint8(tvb, *offset);

        start2 = tvb_get_uint8(tvb, *offset + 1);

        start3 = tvb_get_uint8(tvb, *offset + 2);

        /* check start code is correct */

        if ((start1 != 0x9d) || (start2 != 0x01) || (start3 != 0x2a))

        {

            expert_add_info(pinfo, vp8_keyframe_tree, &ei_vp8_startcode);

        }

        (*offset)++;

        (*offset)++;

        (*offset)++;

        width = tvb_get_letohs(tvb, *offset) & 0x3FFF;

        horizontal_scale = tvb_get_letohs(tvb, *offset)>>14;

        proto_tree_add_uint(vp8_keyframe_tree, hf_vp8_keyframe_horizontal_scale, tvb, *offset, 2, horizontal_scale);

        proto_tree_add_uint(vp8_keyframe_tree, hf_vp8_keyframe_width, tvb, *offset, 2, width);

        (*offset)++;

        (*offset)++;

        height = tvb_get_letohs(tvb, *offset) & 0x3FFF;

        vertical_scale = tvb_get_letohs(tvb, *offset)>>14;

        proto_tree_add_uint(vp8_keyframe_tree, hf_vp8_keyframe_vertical_scale, tvb, *offset, 2, vertical_scale);

        proto_tree_add_uint(vp8_keyframe_tree, hf_vp8_keyframe_height, tvb, *offset, 2, height);

        (*offset)++;

        (*offset)++;

    }

    remainder = tvb_reported_length_remaining(tvb, (*offset));

    if ((*partition1_size) == -1)

    {

        /*no header, continuation?*/

        proto_tree_add_expert_format(vp8_payload_tree, pinfo, &ei_vp8_continuation, tvb, *offset, -1, "Continuation of partition fragment (%d bytes)", remainder);

    }

    else

    {

        if (remainder < *partition1_size)

        {

            /* partition size has already been added to vp8 header tree, but it would be useful to provide additional explanation */

            proto_tree_add_expert_format(vp8_payload_tree, pinfo, &ei_vp8_first_partition_split, tvb, *offset, -1,

                "First partition is split with %d bytes in this packet and %d bytes in subsequent frames", remainder, ((*partition1_size)-remainder));

        }

        else

        {

            (*offset)= (*offset) + (*partition1_size);

            proto_tree_add_expert_format(vp8_payload_tree, pinfo, &ei_vp8_first_partition_plus, tvb, *offset, -1,

                                "This frame contains all of first partition (%d bytes) and also %d bytes from other partitions",

                                *partition1_size, remainder);

        }

    }

    expert_add_info(pinfo, payload_item, &ei_vp8_undecoded);

}

void

proto_register_vp8(void)

{

    module_t *vp8_module;

    expert_module_t* expert_vp8;

    static hf_register_info hf[] = {

        { &hf_vp8_pld_x_bit,

            { "X bit",           "vp8.pld.x",

            FT_BOOLEAN, 8, TFS(&vp8_x_bit_vals), BIT_1_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_r_bit,

            { "R bit",           "vp8.pld.r",

            FT_BOOLEAN, 8, TFS(&vp8_r_bit_vals), BIT_2_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_n_bit,

            { "N bit",           "vp8.pld.n",

            FT_BOOLEAN, 8, TFS(&vp8_n_bit_vals), BIT_3_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_s_bit,

            { "S bit",           "vp8.pld.s",

            FT_BOOLEAN, 8, TFS(&vp8_s_bit_vals), BIT_4_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_part_id,

            { "2nd R bit and Part Id",           "vp8.pld.partid",

            FT_UINT8, BASE_DEC, NULL, BIT_5678_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_i_bit,

            { "I bit",           "vp8.pld.i",

            FT_BOOLEAN, 8, TFS(&vp8_i_bit_vals), BIT_1_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_l_bit,

            { "L bit",           "vp8.pld.l",

            FT_BOOLEAN, 8, TFS(&vp8_l_bit_vals), BIT_2_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_t_bit,

            { "T bit",           "vp8.pld.t",

            FT_BOOLEAN, 8, TFS(&vp8_t_bit_vals), BIT_3_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_k_bit,

            { "K bit",           "vp8.pld.k",

            FT_BOOLEAN, 8, TFS(&vp8_k_bit_vals), BIT_4_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_rsv_a,

            { "Reserved A",           "vp8.pld.rsva",

            FT_UINT8, BASE_DEC, NULL, BIT_5678_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_picture_id,

            { "Picture ID",           "vp8.pld.pictureid",

            FT_UINT8, BASE_DEC, NULL, BIT_NO_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_extended_picture_id,

            { "Extended Picture ID",           "vp8.pld.pictureid",

            FT_UINT16, BASE_DEC, NULL, BIT_EXT_PICTURE_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_tl0picidx,

            { "Temporal layer zero Picture Index (TL0PICIDX)",           "vp8.pld.tl0picidx",

            FT_UINT8, BASE_DEC, NULL, BIT_NO_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_tid,

            { "Temporal layer Index (TID)",           "vp8.pld.tid",

            FT_UINT8, BASE_DEC, NULL, BIT_12_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_y_bit,

            { "1 layer sync bit (Y)",           "vp8.pld.y",

            FT_BOOLEAN, 8, NULL, BIT_3_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_pld_keyidx,

            { "Temporal Key Frame Index (KEYIDX)",           "vp8.pld.keyidx",

            FT_UINT8, BASE_DEC, NULL, BIT_45678_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_hdr_frametype,

            { "frametype",           "vp8.hdr.frametype",

            FT_BOOLEAN, 8, TFS(&vp8_hdr_frametype_vals), BIT_8_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_hdr_version,

            { "version",           "vp8.hdr.version",

            FT_UINT8, BASE_DEC | BASE_RANGE_STRING, RVALS(vp8_hdr_version_vals), BIT_567_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_hdr_show_bit,

            { "Show bit",           "vp8.hdr.show",

            FT_BOOLEAN, 8, NULL, BIT_4_MASK,

            "Set when current frame is for display", HFILL }

        },

        { &hf_vp8_hdr_first_partition_size,

            { "First partition size",           "vp8.hdr.partition_size",

            FT_UINT24, BASE_DEC, NULL, BIT_PARTITION_SIZE_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_keyframe_start_code,

            { "VP8 Start code",           "vp8.keyframe.start_code",

            FT_UINT24, BASE_HEX, NULL, BIT_3BYTE_NO_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_keyframe_width,

            { "Width",           "vp8.keyframe.width",

            FT_UINT16, BASE_DEC, NULL, BIT_2BYTE_NO_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_keyframe_height,

            { "Height",           "vp8.keyframe.height",

            FT_UINT16, BASE_DEC, NULL, BIT_2BYTE_NO_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_keyframe_horizontal_scale,

            { "Horizontal Scale",           "vp8.keyframe.horizontal_scale",

            FT_UINT8, BASE_DEC, NULL, BIT_12_MASK,

            NULL, HFILL }

        },

        { &hf_vp8_keyframe_vertical_scale,

            { "Vertical Scale",           "vp8.keyframe.vertical_scale",

            FT_UINT8, BASE_DEC, NULL, BIT_12_MASK,

            NULL, HFILL }

        }

    };

    static ei_register_info ei[] = {

        { &ei_vp8_startcode, { "vp8.keyframe.startcode", PI_PROTOCOL, PI_ERROR, "Startcode is incorrect", EXPFILL }},

        { &ei_vp8_undecoded, { "vp8.undecoded", PI_UNDECODED, PI_NOTE, "Payload not fully decoded", EXPFILL }},

        { &ei_vp8_continuation, { "vp8.continuation", PI_REASSEMBLE, PI_CHAT, "Continuation of partition fragment", EXPFILL }},

        { &ei_vp8_first_partition_split, { "vp8.first_partition_split", PI_REASSEMBLE, PI_CHAT, "First partition is split", EXPFILL }},

        { &ei_vp8_first_partition_plus, { "vp8.first_partition_plus", PI_REASSEMBLE, PI_CHAT, "This frame contains all of first partition and also bytes from other partitions", EXPFILL }},

    };

    proto_vp8 = proto_register_protocol (

        "VP8", /* name       */

        "VP8",      /* short name */

        "vp8"       /* abbrev     */

        );

    proto_register_field_array(proto_vp8, hf, array_length(hf));

    proto_register_subtree_array(ett, array_length(ett));

    vp8_module = prefs_register_protocol(proto_vp8, NULL);

    expert_vp8 = expert_register_protocol(proto_vp8);

    expert_register_field_array(expert_vp8, ei, array_length(ei));

    prefs_register_obsolete_preference(vp8_module, "dynamic.payload.type");

    vp8_handle = register_dissector("vp8", dissect_vp8, proto_vp8);

}

void

proto_reg_handoff_vp8(void)

{

    dissector_add_string("rtp_dyn_payload_type" , "VP8", vp8_handle);

    dissector_add_uint_range_with_preference("rtp.pt", "", vp8_handle);

}

/*

 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html

 *

 * Local variables:

 * c-basic-offset: 4

 * tab-width: 8

 * indent-tabs-mode: nil

 * End:

 *

 * vi: set shiftwidth=4 tabstop=8 expandtab:

 * :indentSize=4:tabSize=8:noTabs=true:

 */