LCOV - code coverage report
Current view: top level - libavformat - rtpdec_h263.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 29 0.0 %
Date: 2017-12-16 13:57:32 Functions: 0 1 0.0 %

          Line data    Source code
       1             : /*
       2             :  * RTP H.263 Depacketizer, RFC 4629
       3             :  * Copyright (c) 2010 Martin Storsjo
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include "avformat.h"
      23             : #include "rtpdec_formats.h"
      24             : #include "libavutil/attributes.h"
      25             : #include "libavutil/intreadwrite.h"
      26             : 
      27           0 : int ff_h263_handle_packet(AVFormatContext *ctx, PayloadContext *data,
      28             :                           AVStream *st, AVPacket *pkt, uint32_t *timestamp,
      29             :                           const uint8_t *buf, int len, uint16_t seq, int flags)
      30             : {
      31             :     uint8_t *ptr;
      32             :     uint16_t header;
      33             :     int startcode, vrc, picture_header;
      34             : 
      35           0 :     if (len < 2) {
      36           0 :         av_log(ctx, AV_LOG_ERROR, "Too short H.263 RTP packet\n");
      37           0 :         return AVERROR_INVALIDDATA;
      38             :     }
      39             : 
      40             :     /* Decode the 16 bit H.263+ payload header, as described in section
      41             :      * 5.1 of RFC 4629. The fields of this header are:
      42             :      * - 5 reserved bits, should be ignored.
      43             :      * - One bit (P, startcode), indicating a picture start, picture segment
      44             :      *   start or video sequence end. If set, two zero bytes should be
      45             :      *   prepended to the payload.
      46             :      * - One bit (V, vrc), indicating the presence of an 8 bit Video
      47             :      *   Redundancy Coding field after this 16 bit header.
      48             :      * - 6 bits (PLEN, picture_header), the length (in bytes) of an extra
      49             :      *   picture header, following the VRC field.
      50             :      * - 3 bits (PEBIT), the number of bits to ignore of the last byte
      51             :      *   of the extra picture header. (Not used at the moment.)
      52             :      */
      53           0 :     header = AV_RB16(buf);
      54           0 :     startcode      = (header & 0x0400) >> 9;
      55           0 :     vrc            =  header & 0x0200;
      56           0 :     picture_header = (header & 0x01f8) >> 3;
      57           0 :     buf += 2;
      58           0 :     len -= 2;
      59             : 
      60           0 :     if (vrc) {
      61             :         /* Skip VRC header if present, not used at the moment. */
      62           0 :         buf += 1;
      63           0 :         len -= 1;
      64             :     }
      65           0 :     if (picture_header) {
      66             :         /* Skip extra picture header if present, not used at the moment. */
      67           0 :         buf += picture_header;
      68           0 :         len -= picture_header;
      69             :     }
      70             : 
      71           0 :     if (len < 0) {
      72           0 :         av_log(ctx, AV_LOG_ERROR, "Too short H.263 RTP packet\n");
      73           0 :         return AVERROR_INVALIDDATA;
      74             :     }
      75             : 
      76           0 :     if (av_new_packet(pkt, len + startcode)) {
      77           0 :         av_log(ctx, AV_LOG_ERROR, "Out of memory\n");
      78           0 :         return AVERROR(ENOMEM);
      79             :     }
      80           0 :     pkt->stream_index = st->index;
      81           0 :     ptr = pkt->data;
      82             : 
      83           0 :     if (startcode) {
      84           0 :         *ptr++ = 0;
      85           0 :         *ptr++ = 0;
      86             :     }
      87           0 :     memcpy(ptr, buf, len);
      88             : 
      89           0 :     return 0;
      90             : }
      91             : 
      92             : RTPDynamicProtocolHandler ff_h263_1998_dynamic_handler = {
      93             :     .enc_name         = "H263-1998",
      94             :     .codec_type       = AVMEDIA_TYPE_VIDEO,
      95             :     .codec_id         = AV_CODEC_ID_H263,
      96             :     .need_parsing     = AVSTREAM_PARSE_FULL,
      97             :     .parse_packet     = ff_h263_handle_packet,
      98             : };
      99             : 
     100             : RTPDynamicProtocolHandler ff_h263_2000_dynamic_handler = {
     101             :     .enc_name         = "H263-2000",
     102             :     .codec_type       = AVMEDIA_TYPE_VIDEO,
     103             :     .codec_id         = AV_CODEC_ID_H263,
     104             :     .need_parsing     = AVSTREAM_PARSE_FULL,
     105             :     .parse_packet     = ff_h263_handle_packet,
     106             : };

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