LCOV - code coverage report
Current view: top level - libavformat - rtpdec_qcelp.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 91 0.0 %
Date: 2017-12-15 11:05:35 Functions: 0 3 0.0 %

          Line data    Source code
       1             : /*
       2             :  * RTP Depacketization of QCELP/PureVoice, RFC 2658
       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 "rtpdec_formats.h"
      23             : 
      24             : static const uint8_t frame_sizes[] = {
      25             :     1, 4, 8, 17, 35
      26             : };
      27             : 
      28             : typedef struct InterleavePacket {
      29             :     int pos;
      30             :     int size;
      31             :     /* The largest frame is 35 bytes, only 10 frames are allowed per
      32             :      * packet, and we return the first one immediately, so allocate
      33             :      * space for 9 frames */
      34             :     uint8_t data[35*9];
      35             : } InterleavePacket;
      36             : 
      37             : struct PayloadContext {
      38             :     int interleave_size;
      39             :     int interleave_index;
      40             :     InterleavePacket group[6];
      41             :     int group_finished;
      42             : 
      43             :     /* The maximum packet size, 10 frames of 35 bytes each, and one
      44             :      * packet header byte. */
      45             :     uint8_t  next_data[1 + 35*10];
      46             :     int      next_size;
      47             :     uint32_t next_timestamp;
      48             : };
      49             : 
      50             : static int return_stored_frame(AVFormatContext *ctx, PayloadContext *data,
      51             :                                AVStream *st, AVPacket *pkt, uint32_t *timestamp,
      52             :                                const uint8_t *buf, int len);
      53             : 
      54           0 : static int store_packet(AVFormatContext *ctx, PayloadContext *data,
      55             :                         AVStream *st, AVPacket *pkt, uint32_t *timestamp,
      56             :                         const uint8_t *buf, int len)
      57             : {
      58             :     int interleave_size, interleave_index;
      59             :     int frame_size, ret;
      60             :     InterleavePacket* ip;
      61             : 
      62           0 :     if (len < 2)
      63           0 :         return AVERROR_INVALIDDATA;
      64             : 
      65           0 :     interleave_size  = buf[0] >> 3 & 7;
      66           0 :     interleave_index = buf[0]      & 7;
      67             : 
      68           0 :     if (interleave_size > 5) {
      69           0 :         av_log(ctx, AV_LOG_ERROR, "Invalid interleave size %d\n",
      70             :                                    interleave_size);
      71           0 :         return AVERROR_INVALIDDATA;
      72             :     }
      73           0 :     if (interleave_index > interleave_size) {
      74           0 :         av_log(ctx, AV_LOG_ERROR, "Invalid interleave index %d/%d\n",
      75             :                                    interleave_index, interleave_size);
      76           0 :         return AVERROR_INVALIDDATA;
      77             :     }
      78           0 :     if (interleave_size != data->interleave_size) {
      79             :         int i;
      80             :         /* First packet, or changed interleave size */
      81           0 :         data->interleave_size = interleave_size;
      82           0 :         data->interleave_index = 0;
      83           0 :         for (i = 0; i < 6; i++)
      84           0 :             data->group[i].size = 0;
      85             :     }
      86             : 
      87           0 :     if (interleave_index < data->interleave_index) {
      88             :         /* Wrapped around - missed the last packet of the previous group. */
      89           0 :         if (data->group_finished) {
      90             :             /* No more data in the packets in this interleaving group, just
      91             :              * start processing the next one */
      92           0 :             data->interleave_index = 0;
      93             :         } else {
      94             :             /* Stash away the current packet, emit everything we have of the
      95             :              * previous group. */
      96           0 :             for (; data->interleave_index <= interleave_size;
      97           0 :                  data->interleave_index++)
      98           0 :                 data->group[data->interleave_index].size = 0;
      99             : 
     100           0 :             if (len > sizeof(data->next_data))
     101           0 :                 return AVERROR_INVALIDDATA;
     102           0 :             memcpy(data->next_data, buf, len);
     103           0 :             data->next_size = len;
     104           0 :             data->next_timestamp = *timestamp;
     105           0 :             *timestamp = RTP_NOTS_VALUE;
     106             : 
     107           0 :             data->interleave_index = 0;
     108           0 :             return return_stored_frame(ctx, data, st, pkt, timestamp, buf, len);
     109             :         }
     110             :     }
     111           0 :     if (interleave_index > data->interleave_index) {
     112             :         /* We missed a packet */
     113           0 :         for (; data->interleave_index < interleave_index;
     114           0 :              data->interleave_index++)
     115           0 :             data->group[data->interleave_index].size = 0;
     116             :     }
     117           0 :     data->interleave_index = interleave_index;
     118             : 
     119           0 :     if (buf[1] >= FF_ARRAY_ELEMS(frame_sizes))
     120           0 :         return AVERROR_INVALIDDATA;
     121           0 :     frame_size = frame_sizes[buf[1]];
     122           0 :     if (1 + frame_size > len)
     123           0 :         return AVERROR_INVALIDDATA;
     124             : 
     125           0 :     if (len - 1 - frame_size > sizeof(data->group[0].data))
     126           0 :         return AVERROR_INVALIDDATA;
     127             : 
     128           0 :     if ((ret = av_new_packet(pkt, frame_size)) < 0)
     129           0 :         return ret;
     130           0 :     memcpy(pkt->data, &buf[1], frame_size);
     131           0 :     pkt->stream_index = st->index;
     132             : 
     133           0 :     ip = &data->group[data->interleave_index];
     134           0 :     ip->size = len - 1 - frame_size;
     135           0 :     ip->pos = 0;
     136           0 :     memcpy(ip->data, &buf[1 + frame_size], ip->size);
     137             :     /* Each packet must contain the same number of frames according to the
     138             :      * RFC. If there's no data left in this packet, there shouldn't be any
     139             :      * in any of the other frames in the interleaving group either. */
     140           0 :     data->group_finished = ip->size == 0;
     141             : 
     142           0 :     if (interleave_index == interleave_size) {
     143           0 :         data->interleave_index = 0;
     144           0 :         return !data->group_finished;
     145             :     } else {
     146           0 :         data->interleave_index++;
     147           0 :         return 0;
     148             :     }
     149             : }
     150             : 
     151           0 : static int return_stored_frame(AVFormatContext *ctx, PayloadContext *data,
     152             :                                AVStream *st, AVPacket *pkt, uint32_t *timestamp,
     153             :                                const uint8_t *buf, int len)
     154             : {
     155           0 :     InterleavePacket* ip = &data->group[data->interleave_index];
     156             :     int frame_size, ret;
     157             : 
     158           0 :     if (data->group_finished && data->interleave_index == 0) {
     159           0 :         *timestamp = data->next_timestamp;
     160           0 :         ret = store_packet(ctx, data, st, pkt, timestamp, data->next_data,
     161             :                            data->next_size);
     162           0 :         data->next_size = 0;
     163           0 :         return ret;
     164             :     }
     165             : 
     166           0 :     if (ip->size == 0) {
     167             :         /* No stored data for this interleave block, output an empty packet */
     168           0 :         if ((ret = av_new_packet(pkt, 1)) < 0)
     169           0 :             return ret;
     170           0 :         pkt->data[0] = 0; // Blank - could also be 14, Erasure
     171             :     } else {
     172           0 :         if (ip->pos >= ip->size)
     173           0 :             return AVERROR_INVALIDDATA;
     174           0 :         if (ip->data[ip->pos] >= FF_ARRAY_ELEMS(frame_sizes))
     175           0 :             return AVERROR_INVALIDDATA;
     176           0 :         frame_size = frame_sizes[ip->data[ip->pos]];
     177           0 :         if (ip->pos + frame_size > ip->size)
     178           0 :             return AVERROR_INVALIDDATA;
     179             : 
     180           0 :         if ((ret = av_new_packet(pkt, frame_size)) < 0)
     181           0 :             return ret;
     182           0 :         memcpy(pkt->data, &ip->data[ip->pos], frame_size);
     183             : 
     184           0 :         ip->pos += frame_size;
     185           0 :         data->group_finished = ip->pos >= ip->size;
     186             :     }
     187           0 :     pkt->stream_index = st->index;
     188             : 
     189           0 :     if (data->interleave_index == data->interleave_size) {
     190           0 :         data->interleave_index = 0;
     191           0 :         if (!data->group_finished)
     192           0 :             return 1;
     193             :         else
     194           0 :             return data->next_size > 0;
     195             :     } else {
     196           0 :         data->interleave_index++;
     197           0 :         return 1;
     198             :     }
     199             : }
     200             : 
     201           0 : static int qcelp_parse_packet(AVFormatContext *ctx, PayloadContext *data,
     202             :                               AVStream *st, AVPacket *pkt, uint32_t *timestamp,
     203             :                               const uint8_t *buf, int len, uint16_t seq,
     204             :                               int flags)
     205             : {
     206           0 :     if (buf)
     207           0 :         return store_packet(ctx, data, st, pkt, timestamp, buf, len);
     208             :     else
     209           0 :         return return_stored_frame(ctx, data, st, pkt, timestamp, buf, len);
     210             : }
     211             : 
     212             : RTPDynamicProtocolHandler ff_qcelp_dynamic_handler = {
     213             :     .enc_name           = "x-Purevoice",
     214             :     .codec_type         = AVMEDIA_TYPE_AUDIO,
     215             :     .codec_id           = AV_CODEC_ID_QCELP,
     216             :     .priv_data_size     = sizeof(PayloadContext),
     217             :     .static_payload_id  = 12,
     218             :     .parse_packet       = qcelp_parse_packet,
     219             : };

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