![Martin Kaiser](/assets/img/avatar_default.png)
Change-Id: I8e080b250b81976898d2950da9e91fb32b719590 Reviewed-on: https://code.wireshark.org/review/756 Reviewed-by: Martin Kaiser <wireshark@kaiser.cx>
412 lines
14 KiB
C
412 lines
14 KiB
C
/* file-mp4.c
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* routines for dissection of MP4 files
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* Copyright 2013-2014, Martin Kaiser <martin@kaiser.cx>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* this dissector is based on
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* ISO/IEC 14496-12 (ISO base media file format) and
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* ISO/IEC 14496-14 (MP4 file format)
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*
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* at the moment, it dissects the basic box structure and the payload of
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* some simple boxes */
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#include "config.h"
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#include <glib.h>
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#include <epan/expert.h>
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#include <epan/packet.h>
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#define MAKE_TYPE_VAL(a, b, c, d) ((a)<<24 | (b)<<16 | (c)<<8 | (d))
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void proto_register_mp4(void);
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void proto_reg_handoff_mp4(void);
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static int proto_mp4 = -1;
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static gint ett_mp4 = -1;
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static gint ett_mp4_box = -1;
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static int hf_mp4_box_size = -1;
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static int hf_mp4_box_type_str = -1;
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static int hf_mp4_box_largesize = -1;
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static int hf_mp4_full_box_ver = -1;
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static int hf_mp4_ftyp_brand = -1;
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static int hf_mp4_ftyp_ver = -1;
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static int hf_mp4_ftyp_add_brand = -1;
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static int hf_mp4_mfhd_seq_num = -1;
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static expert_field ei_mp4_box_too_large = EI_INIT;
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/* a box must at least have a 32bit len field and a 32bit type */
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#define MIN_BOX_SIZE 8
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/* an extended box has the first length field set to 1 */
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#define BOX_SIZE_EXTENDED 1
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/* the box type is stored as four text characters
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it is in network byte order and contains only printable characters
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for our internal handling, we convert this to a 32bit value */
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#define BOX_TYPE_NONE 0x0 /* used for parent_box_type of a top-level box */
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#define BOX_TYPE_FTYP MAKE_TYPE_VAL('f', 't', 'y', 'p')
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#define BOX_TYPE_MOOV MAKE_TYPE_VAL('m', 'o', 'o', 'v')
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#define BOX_TYPE_MVHD MAKE_TYPE_VAL('m', 'v', 'h', 'd')
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#define BOX_TYPE_TRAK MAKE_TYPE_VAL('t', 'r', 'a', 'k')
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#define BOX_TYPE_TKHD MAKE_TYPE_VAL('t', 'k', 'h', 'd')
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#define BOX_TYPE_MDIA MAKE_TYPE_VAL('m', 'd', 'i', 'a')
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#define BOX_TYPE_MDHD MAKE_TYPE_VAL('m', 'd', 'h', 'd')
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#define BOX_TYPE_HDLR MAKE_TYPE_VAL('h', 'd', 'l', 'r')
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#define BOX_TYPE_MINF MAKE_TYPE_VAL('m', 'i', 'n', 'f')
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#define BOX_TYPE_VMHD MAKE_TYPE_VAL('v', 'm', 'h', 'd')
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#define BOX_TYPE_SMHD MAKE_TYPE_VAL('s', 'm', 'h', 'd')
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#define BOX_TYPE_DINF MAKE_TYPE_VAL('d', 'i', 'n', 'f')
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#define BOX_TYPE_DREF MAKE_TYPE_VAL('d', 'r', 'e', 'f')
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#define BOX_TYPE_STBL MAKE_TYPE_VAL('s', 't', 'b', 'l')
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#define BOX_TYPE_STTS MAKE_TYPE_VAL('s', 't', 't', 's')
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#define BOX_TYPE_CTTS MAKE_TYPE_VAL('c', 't', 't', 's')
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#define BOX_TYPE_STSD MAKE_TYPE_VAL('s', 't', 's', 'd')
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#define BOX_TYPE_STSZ MAKE_TYPE_VAL('s', 't', 's', 'z')
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#define BOX_TYPE_STSC MAKE_TYPE_VAL('s', 't', 's', 'c')
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#define BOX_TYPE_STCO MAKE_TYPE_VAL('s', 't', 'c', 'o')
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#define BOX_TYPE_STSS MAKE_TYPE_VAL('s', 't', 's', 's')
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#define BOX_TYPE_MVEX MAKE_TYPE_VAL('m', 'v', 'e', 'x')
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#define BOX_TYPE_MOOF MAKE_TYPE_VAL('m', 'o', 'o', 'f')
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#define BOX_TYPE_MEHD MAKE_TYPE_VAL('m', 'e', 'h', 'd')
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#define BOX_TYPE_TREX MAKE_TYPE_VAL('t', 'r', 'e', 'x')
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#define BOX_TYPE_MFHD MAKE_TYPE_VAL('m', 'f', 'h', 'd')
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#define BOX_TYPE_TRAF MAKE_TYPE_VAL('t', 'r', 'a', 'f')
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#define BOX_TYPE_TFHD MAKE_TYPE_VAL('t', 'f', 'h', 'd')
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#define BOX_TYPE_TRUN MAKE_TYPE_VAL('t', 'r', 'u', 'n')
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#define BOX_TYPE_MDAT MAKE_TYPE_VAL('m', 'd', 'a', 't')
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#define BOX_TYPE_UDTA MAKE_TYPE_VAL('u', 'd', 't', 'a')
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static const value_string box_types[] = {
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{ BOX_TYPE_FTYP, "File Type Box" },
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{ BOX_TYPE_MOOV, "Movie Box" },
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{ BOX_TYPE_MVHD, "Movie Header Box" },
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{ BOX_TYPE_TRAK, "Track Box" },
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{ BOX_TYPE_TKHD, "Track Header Box" },
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{ BOX_TYPE_MDIA, "Media Box" },
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{ BOX_TYPE_MDHD, "Media Header Box" },
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{ BOX_TYPE_HDLR, "Handler Reference Box" },
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{ BOX_TYPE_MINF, "Media Information Box" },
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{ BOX_TYPE_VMHD, "Video Media Header Box" },
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{ BOX_TYPE_SMHD, "Sound Media Header Box" },
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{ BOX_TYPE_DINF, "Data Information Box" },
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{ BOX_TYPE_DREF, "Data Reference Box" },
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{ BOX_TYPE_STBL, "Sample to Group Box" },
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{ BOX_TYPE_STTS, "Decoding Time To Sample Box" },
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{ BOX_TYPE_CTTS, "Composition Time To Sample Box" },
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{ BOX_TYPE_STSD, "Sample Description Box" },
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{ BOX_TYPE_STSZ, "Sample Size Box" },
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{ BOX_TYPE_STSC, "Sample To Chunk Box" },
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{ BOX_TYPE_STCO, "Chunk Offset Box" },
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{ BOX_TYPE_STSS, "Sync Sample Table" },
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{ BOX_TYPE_MVEX, "Movie Extends Box" },
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{ BOX_TYPE_MOOF, "Movie Fragment Box" },
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{ BOX_TYPE_MEHD, "Movie Extends Header Box" },
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{ BOX_TYPE_TREX, "Track Extends Box" },
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{ BOX_TYPE_MFHD, "Movie Fragment Header Box" },
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{ BOX_TYPE_TRAF, "Track Fragment Box" },
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{ BOX_TYPE_TFHD, "Track Fragment Header Box" },
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{ BOX_TYPE_TRUN, "Track Fragment Run Box" },
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{ BOX_TYPE_MDAT, "Media Data Box" },
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{ BOX_TYPE_UDTA, "User Data Box" },
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{ 0, NULL }
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};
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static gint
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dissect_mp4_mvhd_body(tvbuff_t *tvb, gint offset, gint len _U_,
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packet_info *pinfo _U_, proto_tree *tree)
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{
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gint offset_start;
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offset_start = offset;
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proto_tree_add_item(tree, hf_mp4_full_box_ver,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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offset += 3;
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return offset-offset_start;
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}
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static gint
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dissect_mp4_mfhd_body(tvbuff_t *tvb, gint offset, gint len _U_,
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packet_info *pinfo _U_, proto_tree *tree)
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{
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gint offset_start;
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offset_start = offset;
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proto_tree_add_item(tree, hf_mp4_full_box_ver,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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offset += 3;
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proto_tree_add_item(tree, hf_mp4_mfhd_seq_num,
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tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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return offset-offset_start;
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}
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static gint
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dissect_mp4_tkhd_body(tvbuff_t *tvb, gint offset, gint len,
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packet_info *pinfo _U_, proto_tree *tree)
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{
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proto_tree_add_item(tree, hf_mp4_full_box_ver,
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tvb, offset, 1, ENC_BIG_ENDIAN);
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return len;
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}
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static gint
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dissect_mp4_ftyp_body(tvbuff_t *tvb, gint offset, gint len,
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packet_info *pinfo _U_, proto_tree *tree)
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{
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gint offset_start;
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offset_start = offset;
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proto_tree_add_item(tree, hf_mp4_ftyp_brand,
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tvb, offset, 4, ENC_ASCII|ENC_NA);
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offset += 4;
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proto_tree_add_item(tree, hf_mp4_ftyp_ver,
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tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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while ((offset-offset_start) < len) {
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proto_tree_add_item(tree, hf_mp4_ftyp_add_brand,
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tvb, offset, 4, ENC_ASCII|ENC_NA);
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offset += 4;
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}
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return offset - offset_start;
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}
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/* dissect a box, return its (standard or extended) length or 0 for error */
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static gint
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dissect_mp4_box(guint32 parent_box_type _U_,
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tvbuff_t *tvb, gint offset, packet_info *pinfo, proto_tree *tree)
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{
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gint offset_start;
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guint64 box_size;
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guint32 box_type;
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guint8 *box_type_str;
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proto_item *type_pi, *size_pi, *ext_size_pi = NULL;
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proto_tree *box_tree;
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gint ret;
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gint body_size;
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offset_start = offset;
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/* the following mechanisms are not supported for now
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- size==0, indicating that the box extends to the end of the file
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- extended box types */
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box_size = (guint64)tvb_get_ntohl(tvb, offset);
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if ((box_size != BOX_SIZE_EXTENDED) && (box_size < MIN_BOX_SIZE))
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return -1;
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box_type = tvb_get_ntohl(tvb, offset+4);
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box_type_str = tvb_get_string_enc(wmem_packet_scope(), tvb,
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offset+4, 4, ENC_ASCII|ENC_NA);
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type_pi = proto_tree_add_text(tree, tvb, offset, -1, "%s (%s)",
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val_to_str_const(box_type, box_types, "unknown"), box_type_str);
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box_tree = proto_item_add_subtree(type_pi, ett_mp4_box);
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size_pi = proto_tree_add_item(box_tree, hf_mp4_box_size,
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tvb, offset, 4, ENC_BIG_ENDIAN);
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if (box_size == BOX_SIZE_EXTENDED)
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proto_item_append_text(size_pi, " (actual size is in largesize)");
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offset += 4;
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proto_tree_add_item(box_tree, hf_mp4_box_type_str,
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tvb, offset, 4, ENC_ASCII|ENC_NA);
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offset += 4;
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if (box_size == BOX_SIZE_EXTENDED) {
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box_size = tvb_get_ntoh64(tvb, offset);
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ext_size_pi = proto_tree_add_item(box_tree, hf_mp4_box_largesize,
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tvb, offset, 8, ENC_BIG_ENDIAN);
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offset += 8;
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}
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if (box_size > G_MAXINT) {
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/* this should be ok for ext_size_pi==NULL */
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expert_add_info(pinfo, ext_size_pi, &ei_mp4_box_too_large);
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return -1;
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}
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proto_item_set_len(type_pi, (gint)box_size);
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body_size = (gint)box_size - (offset-offset_start);
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/* XXX - check parent box if supplied */
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switch (box_type) {
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case BOX_TYPE_FTYP:
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dissect_mp4_ftyp_body(tvb, offset, body_size, pinfo, box_tree);
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break;
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case BOX_TYPE_MVHD:
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dissect_mp4_mvhd_body(tvb, offset, body_size, pinfo, box_tree);
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break;
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case BOX_TYPE_MFHD:
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dissect_mp4_mfhd_body(tvb, offset, body_size, pinfo, box_tree);
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break;
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case BOX_TYPE_TKHD:
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dissect_mp4_tkhd_body(tvb, offset, body_size, pinfo, box_tree);
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break;
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case BOX_TYPE_MOOV:
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case BOX_TYPE_MOOF:
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case BOX_TYPE_STBL:
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case BOX_TYPE_MDIA:
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case BOX_TYPE_TRAK:
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case BOX_TYPE_TRAF:
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case BOX_TYPE_MINF:
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case BOX_TYPE_MVEX:
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case BOX_TYPE_DINF:
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case BOX_TYPE_UDTA:
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while (offset-offset_start < (gint)box_size) {
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ret = dissect_mp4_box(box_type, tvb, offset, pinfo, box_tree);
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if (ret <= 0)
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break;
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offset += ret;
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}
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break;
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default:
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break;
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}
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return (gint)box_size;
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}
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static int
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dissect_mp4(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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gint offset = 0;
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guint32 box_type;
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proto_item *pi;
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proto_tree *mp4_tree;
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gint ret;
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/* to make sure that we have an mp4 file, we check that it starts with
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a box of a known type
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please note that we do not allow the first box to be an extended box
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this detection should be safe as long as the dissector is only called for
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the video/mp4 mime type
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when we read mp4 files directly, we might need stricter checks here */
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if (tvb_reported_length(tvb) < MIN_BOX_SIZE)
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return 0;
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box_type = tvb_get_ntohl(tvb, 4);
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if (try_val_to_str(box_type, box_types) == NULL)
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return 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MP4");
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col_clear(pinfo->cinfo, COL_INFO);
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pi = proto_tree_add_protocol_format(tree, proto_mp4,
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tvb, 0, (gint)tvb_reported_length(tvb), "MP4");
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mp4_tree = proto_item_add_subtree(pi, ett_mp4);
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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ret = dissect_mp4_box(BOX_TYPE_NONE, tvb, offset, pinfo, mp4_tree);
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if (ret <= 0)
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break;
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offset += ret;
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}
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return offset;
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}
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void
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proto_register_mp4(void)
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{
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static hf_register_info hf[] = {
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{ &hf_mp4_box_size,
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{ "Box size", "mp4.box.size", FT_UINT32, BASE_DEC,
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NULL, 0, NULL, HFILL } },
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{ &hf_mp4_box_type_str,
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{ "Box type", "mp4.box.type_str", FT_STRING, BASE_NONE,
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NULL, 0, NULL, HFILL } },
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{ &hf_mp4_box_largesize,
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{ "Box size (largesize)", "mp4.box.largesize", FT_UINT64, BASE_DEC,
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NULL, 0, NULL, HFILL } },
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{ &hf_mp4_full_box_ver,
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{ "Box version", "mp4.full_box.version", FT_UINT8, BASE_DEC,
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NULL, 0, NULL, HFILL } },
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{ &hf_mp4_ftyp_brand,
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{ "Brand", "mp4.ftyp.brand", FT_STRING, BASE_NONE,
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NULL, 0, NULL, HFILL } },
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{ &hf_mp4_ftyp_ver,
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{ "Version", "mp4.ftyp.version", FT_UINT32, BASE_DEC,
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NULL, 0, NULL, HFILL } },
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{ &hf_mp4_ftyp_add_brand,
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{ "Additional brand", "mp4.ftyp.additional_brand", FT_STRING,
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BASE_NONE, NULL, 0, NULL, HFILL } },
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{ &hf_mp4_mfhd_seq_num,
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{ "Sequence number", "mp4.mfhd.sequence_number", FT_UINT32,
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BASE_DEC, NULL, 0, NULL, HFILL } }
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};
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static gint *ett[] = {
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&ett_mp4,
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&ett_mp4_box
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};
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static ei_register_info ei[] = {
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{ &ei_mp4_box_too_large,
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{ "mp4.box_too_large", PI_PROTOCOL, PI_WARN,
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"box size too large, dissection of this box is not supported", EXPFILL }}
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};
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expert_module_t *expert_mp4;
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proto_mp4 = proto_register_protocol("MP4 / ISOBMFF file format", "mp4", "mp4");
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proto_register_field_array(proto_mp4, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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expert_mp4 = expert_register_protocol(proto_mp4);
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expert_register_field_array(expert_mp4, ei, array_length(ei));
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}
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void
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proto_reg_handoff_mp4(void)
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{
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dissector_handle_t mp4_handle = new_create_dissector_handle(dissect_mp4, proto_mp4);
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dissector_add_string("media_type", "video/mp4", mp4_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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