Dissect a bit more of the h263 data.
svn path=/trunk/; revision=21376
This commit is contained in:
Anders Broman
parent
ffd05a9579
commit
6898074943
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@ -2,7 +2,7 @@
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*
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* Routines for ITU-T Recommendation H.263 dissection
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*
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* Copyright 2003 Niklas Ögren <niklas.ogren@7l.se>
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* Copyright 2003 Niklas ™gren <niklas.ogren@7l.se>
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* Seven Levels Consultants AB
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*
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* $Id$
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@ -30,8 +30,9 @@
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/*
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* This dissector tries to dissect the H.263 protocol according to
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* ITU-T Recommendations and RFC 2190 and
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* ITU-T Recommendations and RFC 2190,
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* http://www.ietf.org/rfc/rfc4629.txt?number=4629
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* and http://www.itu.int/rec/T-REC-H.263/en
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*/
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@ -100,7 +101,11 @@ static int hf_h263_opptype = -1;
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static int hf_h263_pquant = -1;
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static int hf_h263_cpm = -1;
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static int hf_h263_psbi = -1;
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static int hf_h263_picture_type_code = -1;
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static int hf_h263_ext_source_format = -1;
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static int hf_h263_custom_pcf = -1;
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static int hf_h263_pei = -1;
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static int hf_h263_psupp = -1;
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/* H.263 RFC 4629 fields */
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static int hf_h263P_payload = -1;
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@ -138,6 +143,24 @@ static const value_string srcformat_vals[] =
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{ 0, NULL },
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};
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/*
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* If UFEP is "001", then the following bits are present in PLUSPTYPE:
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* Bits 1-3 Source Format, "000" reserved, "001" sub-QCIF, "010" QCIF, "011" CIF,
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* "100" 4CIF, "101" 16CIF, "110" custom source format, "111" reserved;
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*/
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static const value_string ext_srcformat_vals[] =
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{
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{ 0, "reserved" },
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{ H263_SRCFORMAT_SQCIF, "sub-QCIF 128x96" },
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{ H263_SRCFORMAT_QCIF, "QCIF 176x144" },
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{ H263_SRCFORMAT_CIF, "CIF 352x288" },
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{ H263_SRCFORMAT_4CIF, "4CIF 704x576" },
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{ H263_SRCFORMAT_16CIF, "16CIF 1408x1152" },
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{ 6, "Custom source format",},
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{ 7, "Reserved" },
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{ 0, NULL },
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};
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static const value_string h263_ufep_vals[] =
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{
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{ 0, "Only MPPTYPE included" },
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@ -165,11 +188,31 @@ static const true_false_string PB_frames_mode_flg = {
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"PB-frame",
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"Normal I- or P-picture"
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};
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static const true_false_string cpm_flg = {
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"On",
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"Off"
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};
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static const true_false_string custom_pcf_flg = {
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"Custom PCF",
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"CIF PCF"
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};
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/* Bits 1-3 Picture Type Code:*/
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static const value_string picture_type_code_vals[] =
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{
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{ 0, "I-picture (INTRA)" },
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{ 1, "P-picture (INTER)" },
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{ 2, "Improved PB-frame (see Annex M)" },
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{ 3, "B-picture (see Annex O)" },
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{ 4, "EI-picture (see Annex O)" },
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{ 5, "EP-picture (see Annex O)" },
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{ 6, "Reserved" },
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{ 7, "Reserved" },
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{ 0, NULL },
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};
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/* H.263 fields defining a sub tree */
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static gint ett_h263 = -1;
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static gint ett_h263_payload = -1;
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@ -341,7 +384,7 @@ h263_proto_tree_add_bits(proto_tree *tree, int hf_index, tvbuff_t *tvb, gint bit
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guint length;
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guint bit_length;
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char *str;
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header_field_info *hfinfo;
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header_field_info *hf_field;
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guint32 value = 0;
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int bit;
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guint32 mask = 0, tmp;
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@ -356,7 +399,7 @@ h263_proto_tree_add_bits(proto_tree *tree, int hf_index, tvbuff_t *tvb, gint bit
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if((bit_offset&0x7)==0)
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is_bytealigned = TRUE;
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hfinfo = proto_registrar_get_nth(hf_index);
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hf_field = proto_registrar_get_nth(hf_index);
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offset = bit_offset>>3;
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bit_length = ((bit_offset&0x7)+no_of_bits);
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@ -488,34 +531,41 @@ h263_proto_tree_add_bits(proto_tree *tree, int hf_index, tvbuff_t *tvb, gint bit
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strcat(str,".");
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}
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strcat(str," = ");
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strcat(str,hfinfo->name);
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if(return_value){
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*return_value=value;
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}
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if (no_of_bits== 1){
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if(hf_index == -1)
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return NULL;
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strcat(str," = ");
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strcat(str,hf_field->name);
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if (hf_field->type == FT_BOOLEAN){
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/* Boolean field */
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if (hfinfo->strings) {
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if (hf_field->strings) {
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const true_false_string *tfstring = &tfs_true_false;
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tfstring = (const struct true_false_string*) hfinfo->strings;
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tfstring = (const struct true_false_string*) hf_field->strings;
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return proto_tree_add_boolean_format(tree, hf_index, tvb, offset, length, value,
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"%s: %s",
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str,
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value ? tfstring->true_string : tfstring->false_string);
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}else{
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return proto_tree_add_boolean_format(tree, hf_index, tvb, offset, length, value,
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"%s: %u",
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str,
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value);
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}
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}
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/* 2 - 32 bits field */
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/* 1 - 32 bits field */
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if (hfinfo->strings) {
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if (hf_field->strings) {
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return proto_tree_add_uint_format(tree, hf_index, tvb, offset, length, value,
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"%s: %s",
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str,
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val_to_str(value, cVALS(hfinfo->strings), "Unknown"));
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val_to_str(value, cVALS(hf_field->strings), "Unknown"));
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}
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switch(hfinfo->display){
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switch(hf_field->display){
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case BASE_DEC:
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return proto_tree_add_uint_format(tree, hf_index, tvb, offset, length, value,
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"%s: %u",
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@ -536,6 +586,16 @@ h263_proto_tree_add_bits(proto_tree *tree, int hf_index, tvbuff_t *tvb, gint bit
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}
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/*
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* 5.3 Macroblock layer
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static int
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dissect_h263_macroblock_layer( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint offset)
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{
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}
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*/
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static int
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dissect_h263_group_of_blocks_layer( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint offset, gboolean is_rfc4626)
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{
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@ -547,7 +607,9 @@ dissect_h263_group_of_blocks_layer( tvbuff_t *tvb, packet_info *pinfo, proto_tre
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h263_proto_tree_add_bits(tree, hf_h263_gbsc, tvb, offset_in_bits, 1, NULL);
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offset_in_bits++;
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}else{
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/* Group of Block Start Code (GBSC) (17 bits) */
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/* Group of Block Start Code (GBSC) (17 bits)
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* A word of 17 bits. Its value is 0000 0000 0000 0000 1.
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*/
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h263_proto_tree_add_bits(tree, hf_h263_gbsc, tvb, offset_in_bits, 17, NULL);
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offset_in_bits = offset_in_bits +17;
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}
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@ -556,6 +618,18 @@ dissect_h263_group_of_blocks_layer( tvbuff_t *tvb, packet_info *pinfo, proto_tre
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*/
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h263_proto_tree_add_bits(tree, hf_h263_GN, tvb, offset_in_bits, 5, NULL);
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offset_in_bits = offset_in_bits +5;
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/* 5.2.4 GOB Sub-Bitstream Indicator (GSBI) (2 bits)
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* A fixed length codeword of 2 bits that is only present if CPM is "1" in the picture header.
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*/
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/*
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* 5.2.5 GOB Frame ID (GFID) (2 bits)
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*/
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/*
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* 5.2.6 Quantizer Information (GQUANT) (5 bits)
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*/
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/*
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* 5.3 Macroblock layer
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*/
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return offset_in_bits>>3;
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}
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@ -574,7 +648,10 @@ dissect_h263_picture_layer( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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guint32 ufep;
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guint32 picture_coding_type;
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guint32 PB_frames_mode = 0;
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guint32 custom_pcf = 0;
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guint32 picture_type_code =0;
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guint32 cpm;
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guint32 pei;
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if(is_rfc4626){
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/* PC 1000 00xx */
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@ -647,12 +724,13 @@ dissect_h263_picture_layer( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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* Bits 1-3 Source Format, "000" reserved, "001" sub-QCIF, "010" QCIF, "011" CIF,
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* "100" 4CIF, "101" 16CIF, "110" custom source format, "111" reserved;
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*/
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h263_proto_tree_add_bits( h263_opptype_tree, hf_h263_source_format, tvb, offset_in_bits, 3, NULL);
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h263_proto_tree_add_bits( h263_opptype_tree, hf_h263_ext_source_format, tvb, offset_in_bits, 3, NULL);
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offset_in_bits = offset_in_bits +3;
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/*
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* Bit 4 Optional Custom PCF, "0" CIF PCF, "1" custom PCF;
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*/
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h263_proto_tree_add_bits( h263_opptype_tree, hf_h263_custom_pcf, tvb, offset_in_bits, 3, &custom_pcf);
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offset_in_bits++;
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/*
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* Bit 5 Optional Unrestricted Motion Vector (UMV) mode (see Annex D), "0" off, "1" on;
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@ -714,7 +792,7 @@ dissect_h263_picture_layer( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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/*
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* 5.1.4.3 The mandatory part of PLUSPTYPE when PLUSPTYPE present (MPPTYPE) (9 bits)
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* Regardless of the value of UFEP, the following 9 bits are also present in PLUSPTYPE:
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* – Bits 1-3 Picture Type Code:
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* - Bits 1-3 Picture Type Code:
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* "000" I-picture (INTRA);
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* "001" P-picture (INTER);
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* "010" Improved PB-frame (see Annex M);
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@ -723,14 +801,33 @@ dissect_h263_picture_layer( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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* "101" EP-picture (see Annex O);
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* "110" Reserved;
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* "111" Reserved;
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*/
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h263_proto_tree_add_bits( tree, hf_h263_picture_type_code, tvb, offset_in_bits, 3, &picture_type_code);
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offset_in_bits = offset_in_bits +3;
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/*
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* Bit 4 Optional Reference Picture Resampling (RPR) mode (see Annex P), "0" off, "1" on;
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*/
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offset_in_bits++;
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/*
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* Bit 5 Optional Reduced-Resolution Update (RRU) mode (see Annex Q), "0" off, "1" on;
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*/
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offset_in_bits++;
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/*
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* Bit 6 Rounding Type (RTYPE) (see 6.1.2);
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*/
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offset_in_bits++;
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/*
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* Bit 7 Reserved, shall be equal to "0";
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*/
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offset_in_bits++;
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/*
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* Bit 8 Reserved, shall be equal to "0";
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*/
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offset_in_bits++;
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/*
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* Bit 9 Equal to "1" to prevent start code emulation.
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*/
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offset_in_bits = offset_in_bits +9;
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offset_in_bits++;
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/* The picture header location of CPM (1 bit) and PSBI (2 bits)
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* the picture header depends on whether or not PLUSPTYPE is present
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* (see 5.1.20 and 5.1.21). If PLUSPTYPE is present, then CPM follows
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@ -790,9 +887,9 @@ dissect_h263_picture_layer( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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* A fixed length codeword of 2 bits which is present only if the optional Slice Structured mode
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* (see Annex K) is indicated in PLUSPTYPE and UFEP is 001. If the Slice Structured mode is in use
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* but UFEP is not 001, the last values sent for SSS shall remain in effect.
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* – Bit 1 Rectangular Slices, "0" indicates free-running slices, "1" indicates rectangular
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* - Bit 1 Rectangular Slices, "0" indicates free-running slices, "1" indicates rectangular
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* slices;
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* – Bit 2 Arbitrary Slice Ordering, "0" indicates sequential order, "1" indicates arbitrary
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* - Bit 2 Arbitrary Slice Ordering, "0" indicates sequential order, "1" indicates arbitrary
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* order.
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* 5.1.11 Enhancement Layer Number (ELNUM) (4 bits)
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* A fixed length codeword of 4 bits which is present only if the optional Temporal, SNR, and Spatial
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@ -815,17 +912,17 @@ dissect_h263_picture_layer( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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* use and UFEP is 001. When present, RPSMF indicates which type of back-channel messages are
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* needed by the encoder. If the Reference Picture Selection mode is in use but RPSMF is not present,
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* the last value of RPSMF that was sent shall remain in effect.
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* – 100: neither ACK nor NACK signals needed;
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* – 101: need ACK signals to be returned;
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* – 110: need NACK signals to be returned;
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* – 111: need both ACK and NACK signals to be returned;
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* – 000-011: Reserved.
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* - 100: neither ACK nor NACK signals needed;
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* - 101: need ACK signals to be returned;
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* - 110: need NACK signals to be returned;
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* - 111: need both ACK and NACK signals to be returned;
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* - 000-011: Reserved.
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* 5.1.14 Temporal Reference for Prediction Indication (TRPI) (1 bit)
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* A fixed length codeword of 1 bit that is present only if the optional Reference Picture Selection
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* mode is in use (regardless of the value of UFEP). When present, TRPI indicates the presence of the
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* following TRP field:
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* – 0: TRP field is not present;
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* – 1: TRP field is present.
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* - 0: TRP field is not present;
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* - 1: TRP field is present.
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* TRPI shall be 0 whenever the picture header indicates an I- or EI-picture.
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* 5.1.15 Temporal Reference for Prediction (TRP) (10 bits)
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* When present (as indicated in TRPI), TRP indicates the Temporal Reference which is used for
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@ -857,7 +954,6 @@ dissect_h263_picture_layer( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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* from that of the previous encoded picture, in which case the RPRP field is not present and the
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* Reference Picture Resampling mode bit is not set.
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*/
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return offset_in_bits>>3;
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}
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/* 5.1.19 Quantizer Information (PQUANT) (5 bits) */
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h263_proto_tree_add_bits( tree, hf_h263_pquant, tvb, offset_in_bits, 5, NULL);
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@ -879,7 +975,44 @@ dissect_h263_picture_layer( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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* It is 3 bits long for standard CIF picture clock frequency and is
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* extended to 5 bits when a custom picture clock frequency is in use.
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*/
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/* TODO Add the rest of the fields */
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if((PB_frames_mode == 1)||(picture_type_code == 2 )){
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if(custom_pcf == 0){
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h263_proto_tree_add_bits( tree, hf_h263_trb, tvb, offset_in_bits, 3, NULL);
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offset_in_bits = offset_in_bits +3;
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}else{
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h263_proto_tree_add_bits( tree, hf_h263_trb, tvb, offset_in_bits, 5, NULL);
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offset_in_bits = offset_in_bits +5;
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}
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}
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/* 5.1.23 Quantization information for B-pictures in PB-frames (DBQUANT) (2 bits)
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* DBQUANT is present if PTYPE or PLUSPTYPE indicates "PB-frame" or "Improved PB-frame"
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*/
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if((PB_frames_mode == 1)||(picture_type_code == 2 )){
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offset_in_bits = offset_in_bits +2;
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}
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/* 5.1.24 Extra Insertion Information (PEI) (1 bit)
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* A bit which when set to "1" signals the presence of the following optional data field.
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*/
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h263_proto_tree_add_bits( tree, hf_h263_pei, tvb, offset_in_bits, 1, &pei);
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while(pei==1)
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{
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/*5.1.25 Supplemental Enhancement Information (PSUPP) (0/8/16 ... bits)
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* If PEI is set to "1", then 9 bits follow consisting of 8 bits of data (PSUPP) and then another PEI bit
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* to indicate if a further 9 bits follow and so on. Encoders shall use PSUPP as specified in Annex L.
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*/
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h263_proto_tree_add_bits( tree, hf_h263_psupp, tvb, offset_in_bits, 8, NULL);
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offset_in_bits = offset_in_bits +8;
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h263_proto_tree_add_bits( tree, hf_h263_pei, tvb, offset_in_bits, 1, &pei);
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}
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/* For the first GOB in each picture (with number 0), no GOB header shall be transmitted.
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* For all other GOBs, the GOB header may be empty, depending on the encoder strategy.
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*/
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/*
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* 5.3 Macroblock layer
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* dissect_h263_macroblock_layer( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint offset)
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*/
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return offset_in_bits>>3;
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@ -986,9 +1119,13 @@ dissect_h263P( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
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/* Startc code holds bit 17 -23 of the codeword */
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startcode = tvb_get_guint8(tvb,offset)&0xfe;
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if (startcode & 0x80){
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/* All picture, slice, and EOSBS start codes
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* shall be byte aligned, and GOB and EOS start codes may be byte aligned.
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*/
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switch(startcode){
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case 0xf8:
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/* End Of Sub-Bitstream code (EOSBS)
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* EOSBS codes shall be byte aligned
|
||||
* ( 1111 100. )
|
||||
*/
|
||||
break;
|
||||
|
|
@ -1098,7 +1235,7 @@ static void dissect_h263_data( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tr
|
|||
*/
|
||||
if ( check_col( pinfo->cinfo, COL_INFO) )
|
||||
col_append_str( pinfo->cinfo, COL_INFO, "(GBSC) ");
|
||||
dissect_h263_group_of_blocks_layer( tvb, pinfo, h263_payload_tree, offset,FALSE);
|
||||
offset = dissect_h263_group_of_blocks_layer( tvb, pinfo, h263_payload_tree, offset,FALSE);
|
||||
break;
|
||||
}
|
||||
}else{
|
||||
|
|
@ -1465,7 +1602,7 @@ proto_register_h263(void)
|
|||
&hf_h263_source_format,
|
||||
{
|
||||
"H.263 Source Format",
|
||||
"h263.split_screen_indicator",
|
||||
"h263.source_format",
|
||||
FT_UINT8,
|
||||
BASE_HEX,
|
||||
VALS(srcformat_vals),
|
||||
|
|
@ -1473,6 +1610,18 @@ proto_register_h263(void)
|
|||
"Source Format", HFILL
|
||||
}
|
||||
},
|
||||
{
|
||||
&hf_h263_ext_source_format,
|
||||
{
|
||||
"H.263 Source Format",
|
||||
"h263.ext_source_format",
|
||||
FT_UINT8,
|
||||
BASE_HEX,
|
||||
VALS(ext_srcformat_vals),
|
||||
0x0,
|
||||
"Source Format", HFILL
|
||||
}
|
||||
},
|
||||
{
|
||||
&hf_h263_UFEP,
|
||||
{
|
||||
|
|
@ -1605,7 +1754,54 @@ proto_register_h263(void)
|
|||
"Picture Sub-Bitstream Indicator (PSBI)", HFILL
|
||||
}
|
||||
},
|
||||
|
||||
{
|
||||
&hf_h263_picture_type_code,
|
||||
{
|
||||
"H.263 Picture Type Code",
|
||||
"h263.psi",
|
||||
FT_UINT32,
|
||||
BASE_DEC,
|
||||
VALS(picture_type_code_vals),
|
||||
0x0,
|
||||
"Picture Type Code", HFILL
|
||||
}
|
||||
},
|
||||
{
|
||||
&hf_h263_custom_pcf,
|
||||
{
|
||||
"H.263 Custom PCF",
|
||||
"h263.custom_pcf",
|
||||
FT_BOOLEAN,
|
||||
8,
|
||||
TFS(&custom_pcf_flg),
|
||||
0x0,
|
||||
"Custom PCF", HFILL
|
||||
}
|
||||
},
|
||||
{
|
||||
&hf_h263_pei,
|
||||
{
|
||||
"H.263 Extra Insertion Information (PEI)",
|
||||
"h263.pei",
|
||||
FT_BOOLEAN,
|
||||
8,
|
||||
NULL,
|
||||
0x0,
|
||||
"Extra Insertion Information (PEI)", HFILL
|
||||
}
|
||||
},
|
||||
{
|
||||
&hf_h263_psupp,
|
||||
{
|
||||
"H.263 Supplemental Enhancement Information (PSUPP)",
|
||||
"h263.psupp",
|
||||
FT_UINT32,
|
||||
BASE_DEC,
|
||||
NULL,
|
||||
0x0,
|
||||
"Supplemental Enhancement Information (PSUPP)", HFILL
|
||||
}
|
||||
},
|
||||
};
|
||||
|
||||
static gint *ett[] =
|
||||
|
|
|
|||
Loading…
Reference in New Issue