LCOV - code coverage report
Current view: top level - libavformat - qcp.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 65 83 78.3 %
Date: 2017-12-17 11:58:42 Functions: 4 4 100.0 %

          Line data    Source code
       1             : /*
       2             :  * QCP format (.qcp) demuxer
       3             :  * Copyright (c) 2009 Kenan Gillet
       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             : /**
      23             :  * @file
      24             :  * QCP format (.qcp) demuxer
      25             :  * @author Kenan Gillet
      26             :  * @see RFC 3625: "The QCP File Format and Media Types for Speech Data"
      27             :  *     http://tools.ietf.org/html/rfc3625
      28             :  */
      29             : 
      30             : #include "libavutil/channel_layout.h"
      31             : #include "libavutil/intreadwrite.h"
      32             : #include "avformat.h"
      33             : #include "riff.h"
      34             : 
      35             : typedef struct QCPContext {
      36             :     uint32_t data_size;                     ///< size of data chunk
      37             : 
      38             : #define QCP_MAX_MODE 4
      39             :     int16_t rates_per_mode[QCP_MAX_MODE+1]; ///< contains the packet size corresponding
      40             :                                             ///< to each mode, -1 if no size.
      41             : } QCPContext;
      42             : 
      43             : /**
      44             :  * Last 15 out of 16 bytes of QCELP-13K GUID, as stored in the file;
      45             :  * the first byte of the GUID can be either 0x41 or 0x42.
      46             :  */
      47             : static const uint8_t guid_qcelp_13k_part[15] = {
      48             :     0x6d, 0x7f, 0x5e, 0x15, 0xb1, 0xd0, 0x11, 0xba,
      49             :     0x91, 0x00, 0x80, 0x5f, 0xb4, 0xb9, 0x7e
      50             : };
      51             : 
      52             : /**
      53             :  * EVRC GUID as stored in the file
      54             :  */
      55             : static const uint8_t guid_evrc[16] = {
      56             :     0x8d, 0xd4, 0x89, 0xe6, 0x76, 0x90, 0xb5, 0x46,
      57             :     0x91, 0xef, 0x73, 0x6a, 0x51, 0x00, 0xce, 0xb4
      58             : };
      59             : 
      60             : static const uint8_t guid_4gv[16] = {
      61             :     0xca, 0x29, 0xfd, 0x3c, 0x53, 0xf6, 0xf5, 0x4e,
      62             :     0x90, 0xe9, 0xf4, 0x23, 0x6d, 0x59, 0x9b, 0x61
      63             : };
      64             : 
      65             : /**
      66             :  * SMV GUID as stored in the file
      67             :  */
      68             : static const uint8_t guid_smv[16] = {
      69             :     0x75, 0x2b, 0x7c, 0x8d, 0x97, 0xa7, 0x49, 0xed,
      70             :     0x98, 0x5e, 0xd5, 0x3c, 0x8c, 0xc7, 0x5f, 0x84
      71             : };
      72             : 
      73             : /**
      74             :  * @param guid contains at least 16 bytes
      75             :  * @return 1 if the guid is a qcelp_13k guid, 0 otherwise
      76             :  */
      77           2 : static int is_qcelp_13k_guid(const uint8_t *guid) {
      78           2 :     return (guid[0] == 0x41 || guid[0] == 0x42)
      79           4 :         && !memcmp(guid+1, guid_qcelp_13k_part, sizeof(guid_qcelp_13k_part));
      80             : }
      81             : 
      82        6130 : static int qcp_probe(AVProbeData *pd)
      83             : {
      84        7033 :     if (AV_RL32(pd->buf  ) == AV_RL32("RIFF") &&
      85         903 :         AV_RL64(pd->buf+8) == AV_RL64("QLCMfmt "))
      86           2 :         return AVPROBE_SCORE_MAX;
      87        6128 :     return 0;
      88             : }
      89             : 
      90           2 : static int qcp_read_header(AVFormatContext *s)
      91             : {
      92           2 :     AVIOContext *pb = s->pb;
      93           2 :     QCPContext    *c  = s->priv_data;
      94           2 :     AVStream      *st = avformat_new_stream(s, NULL);
      95             :     uint8_t       buf[16];
      96             :     int           i, nb_rates;
      97             : 
      98           2 :     if (!st)
      99           0 :         return AVERROR(ENOMEM);
     100             : 
     101           2 :     avio_rb32(pb);                    // "RIFF"
     102           2 :     avio_skip(pb, 4 + 8 + 4 + 1 + 1);    // filesize + "QLCMfmt " + chunk-size + major-version + minor-version
     103             : 
     104           2 :     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
     105           2 :     st->codecpar->channels   = 1;
     106           2 :     st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
     107           2 :     avio_read(pb, buf, 16);
     108           2 :     if (is_qcelp_13k_guid(buf)) {
     109           2 :         st->codecpar->codec_id = AV_CODEC_ID_QCELP;
     110           0 :     } else if (!memcmp(buf, guid_evrc, 16)) {
     111           0 :         st->codecpar->codec_id = AV_CODEC_ID_EVRC;
     112           0 :     } else if (!memcmp(buf, guid_smv, 16)) {
     113           0 :         st->codecpar->codec_id = AV_CODEC_ID_SMV;
     114           0 :     } else if (!memcmp(buf, guid_4gv, 16)) {
     115           0 :         st->codecpar->codec_id = AV_CODEC_ID_4GV;
     116             :     } else {
     117           0 :         av_log(s, AV_LOG_ERROR, "Unknown codec GUID "FF_PRI_GUID".\n",
     118           0 :                FF_ARG_GUID(buf));
     119           0 :         return AVERROR_INVALIDDATA;
     120             :     }
     121           2 :     avio_skip(pb, 2 + 80); // codec-version + codec-name
     122           2 :     st->codecpar->bit_rate = avio_rl16(pb);
     123             : 
     124           2 :     s->packet_size = avio_rl16(pb);
     125           2 :     avio_skip(pb, 2); // block-size
     126           2 :     st->codecpar->sample_rate = avio_rl16(pb);
     127           2 :     avio_skip(pb, 2); // sample-size
     128             : 
     129           2 :     memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode));
     130           2 :     nb_rates = avio_rl32(pb);
     131           2 :     nb_rates = FFMIN(nb_rates, 8);
     132          12 :     for (i=0; i<nb_rates; i++) {
     133          10 :         int size = avio_r8(pb);
     134          10 :         int mode = avio_r8(pb);
     135          10 :         if (mode > QCP_MAX_MODE) {
     136           0 :             av_log(s, AV_LOG_WARNING, "Unknown entry %d=>%d in rate-map-table.\n ", mode, size);
     137             :         } else
     138          10 :             c->rates_per_mode[mode] = size;
     139             :     }
     140           2 :     avio_skip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved
     141             : 
     142           2 :     return 0;
     143             : }
     144             : 
     145         992 : static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt)
     146             : {
     147         992 :     AVIOContext *pb = s->pb;
     148         992 :     QCPContext    *c  = s->priv_data;
     149             :     unsigned int  chunk_size, tag;
     150             : 
     151        1994 :     while(!avio_feof(pb)) {
     152        1000 :         if (c->data_size) {
     153         990 :             int pkt_size, ret, mode = avio_r8(pb);
     154             : 
     155         990 :             if (s->packet_size) {
     156           0 :                 pkt_size = s->packet_size - 1;
     157         990 :             } else if (mode > QCP_MAX_MODE || (pkt_size = c->rates_per_mode[mode]) < 0) {
     158           0 :                 c->data_size--;
     159           0 :                 continue;
     160             :             }
     161             : 
     162         990 :             if (c->data_size <= pkt_size) {
     163           0 :                 av_log(s, AV_LOG_WARNING, "Data chunk is too small.\n");
     164           0 :                 pkt_size = c->data_size - 1;
     165             :             }
     166             : 
     167         990 :             if ((ret = av_get_packet(pb, pkt, pkt_size)) >= 0) {
     168         990 :                 if (pkt_size != ret)
     169           0 :                     av_log(s, AV_LOG_ERROR, "Packet size is too small.\n");
     170             : 
     171         990 :                 c->data_size -= pkt_size + 1;
     172             :             }
     173         990 :             return ret;
     174             :         }
     175             : 
     176          10 :         if (avio_tell(pb) & 1 && avio_r8(pb))
     177           0 :             av_log(s, AV_LOG_WARNING, "Padding should be 0.\n");
     178             : 
     179          10 :         tag        = avio_rl32(pb);
     180          10 :         chunk_size = avio_rl32(pb);
     181          10 :         switch (tag) {
     182           2 :         case MKTAG('v', 'r', 'a', 't'):
     183           2 :             if (avio_rl32(pb)) // var-rate-flag
     184           2 :                 s->packet_size = 0;
     185           2 :             avio_skip(pb, 4); // size-in-packets
     186           2 :             break;
     187           2 :         case MKTAG('d', 'a', 't', 'a'):
     188           2 :             c->data_size = chunk_size;
     189           2 :             break;
     190             : 
     191           6 :         default:
     192           6 :             avio_skip(pb, chunk_size);
     193             :         }
     194             :     }
     195           2 :     return AVERROR_EOF;
     196             : }
     197             : 
     198             : AVInputFormat ff_qcp_demuxer = {
     199             :     .name           = "qcp",
     200             :     .long_name      = NULL_IF_CONFIG_SMALL("QCP"),
     201             :     .priv_data_size = sizeof(QCPContext),
     202             :     .read_probe     = qcp_probe,
     203             :     .read_header    = qcp_read_header,
     204             :     .read_packet    = qcp_read_packet,
     205             : };

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