libavformat/qcp.c

   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 libavformat/qcp.c
  24  * QCP format (.qcp) demuxer
  25  * @author Kenan Gillet
  26  * @sa RFC 3625: "The QCP File Format and Media Types for Speech Data"
  27  *     http://tools.ietf.org/html/rfc3625
  28  */
  29
  30 #include "libavutil/intreadwrite.h"
  31 #include "avformat.h"
  32
  33 typedef struct {
  34     uint32_t data_size;                     ///< size of data chunk
  35
  36 #define QCP_MAX_MODE 4
  37     int16_t rates_per_mode[QCP_MAX_MODE+1]; ///< contains the packet size corresponding
  38                                             ///< to each mode, -1 if no size.
  39 } QCPContext;
  40
  41 /**
  42  * Last 15 out of 16 bytes of QCELP-13K GUID, as stored in the file;
  43  * the first byte of the GUID can be either 0x41 or 0x42.
  44  */
  45 static const uint8_t guid_qcelp_13k_part[15] = {
  46     0x6d, 0x7f, 0x5e, 0x15, 0xb1, 0xd0, 0x11, 0xba,
  47     0x91, 0x00, 0x80, 0x5f, 0xb4, 0xb9, 0x7e
  48 };
  49
  50 /**
  51  * EVRC GUID as stored in the file
  52  */
  53 static const uint8_t guid_evrc[16] = {
  54     0x8d, 0xd4, 0x89, 0xe6, 0x76, 0x90, 0xb5, 0x46,
  55     0x91, 0xef, 0x73, 0x6a, 0x51, 0x00, 0xce, 0xb4
  56 };
  57
  58 /**
  59  * SMV GUID as stored in the file
  60  */
  61 static const uint8_t guid_smv[16] = {
  62     0x75, 0x2b, 0x7c, 0x8d, 0x97, 0xa7, 0x49, 0xed,
  63     0x98, 0x5e, 0xd5, 0x3c, 0x8c, 0xc7, 0x5f, 0x84
  64 };
  65
  66 /**
  67  * @param guid contains at least 16 bytes
  68  * @return 1 if the guid is a qcelp_13k guid, 0 otherwise
  69  */
  70 static int is_qcelp_13k_guid(const uint8_t *guid) {
  71     return (guid[0] == 0x41 || guid[0] == 0x42)
  72         && !memcmp(guid+1, guid_qcelp_13k_part, sizeof(guid_qcelp_13k_part));
  73 }
  74
  75 static int qcp_probe(AVProbeData *pd)
  76 {
  77     if (AV_RL32(pd->buf  ) == AV_RL32("RIFF") &&
  78         AV_RL64(pd->buf+8) == AV_RL64("QLCMfmt "))
  79         return AVPROBE_SCORE_MAX;
  80     return 0;
  81 }
  82
  83 static int qcp_read_header(AVFormatContext *s, AVFormatParameters *ap)
  84 {
  85     ByteIOContext *pb = s->pb;
  86     QCPContext    *c  = s->priv_data;
  87     AVStream      *st = av_new_stream(s, 0);
  88     uint8_t       buf[16];
  89     int           i, nb_rates;
  90
  91     if (!st)
  92         return AVERROR(ENOMEM);
  93
  94     get_be32(pb);                    // "RIFF"
  95     s->file_size = get_le32(pb) + 8;
  96     url_fskip(pb, 8 + 4 + 1 + 1);    // "QLCMfmt " + chunk-size + major-version + minor-version
  97
  98     st->codec->codec_type = CODEC_TYPE_AUDIO;
  99     st->codec->channels   = 1;
 100     get_buffer(pb, buf, 16);
 101     if (is_qcelp_13k_guid(buf)) {
 102         st->codec->codec_id = CODEC_ID_QCELP;
 103     } else if (!memcmp(buf, guid_evrc, 16)) {
 104         av_log(s, AV_LOG_ERROR, "EVRC codec is not supported.\n");
 105         return AVERROR_PATCHWELCOME;
 106     } else if (!memcmp(buf, guid_smv, 16)) {
 107         av_log(s, AV_LOG_ERROR, "SMV codec is not supported.\n");
 108         return AVERROR_PATCHWELCOME;
 109     } else {
 110         av_log(s, AV_LOG_ERROR, "Unknown codec GUID.\n");
 111         return AVERROR_INVALIDDATA;
 112     }
 113     url_fskip(pb, 2 + 80); // codec-version + codec-name
 114     st->codec->bit_rate = get_le16(pb);
 115
 116     s->packet_size = get_le16(pb);
 117     url_fskip(pb, 2); // block-size
 118     st->codec->sample_rate = get_le16(pb);
 119     url_fskip(pb, 2); // sample-size
 120
 121     memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode));
 122     nb_rates = get_le32(pb);
 123     nb_rates = FFMIN(nb_rates, 8);
 124     for (i=0; i<nb_rates; i++) {
 125         int size = get_byte(pb);
 126         int mode = get_byte(pb);
 127         if (mode > QCP_MAX_MODE) {
 128             av_log(s, AV_LOG_WARNING, "Unknown entry %d=>%d in rate-map-table.\n ", mode, size);
 129         } else
 130             c->rates_per_mode[mode] = size;
 131     }
 132     url_fskip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved
 133
 134     return 0;
 135 }
 136
 137 static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt)
 138 {
 139     ByteIOContext *pb = s->pb;
 140     QCPContext    *c  = s->priv_data;
 141     unsigned int  chunk_size, tag;
 142
 143     while(!url_feof(pb)) {
 144         if (c->data_size) {
 145             int pkt_size, ret, mode = get_byte(pb);
 146
 147             if (s->packet_size) {
 148                 pkt_size = s->packet_size - 1;
 149             } else if (mode > QCP_MAX_MODE || (pkt_size = c->rates_per_mode[mode]) < 0) {
 150                 c->data_size--;
 151                 continue;
 152             }
 153
 154             if (c->data_size <= pkt_size) {
 155                 av_log(s, AV_LOG_WARNING, "Data chunk is too small.\n");
 156                 pkt_size = c->data_size - 1;
 157             }
 158
 159             if ((ret = av_get_packet(pb, pkt, pkt_size)) >= 0) {
 160                 if (pkt_size != ret)
 161                     av_log(s, AV_LOG_ERROR, "Packet size is too small.\n");
 162
 163                 c->data_size -= pkt_size + 1;
 164             }
 165             return ret;
 166         }
 167
 168         if (url_ftell(pb) & 1 && get_byte(pb))
 169             av_log(s, AV_LOG_WARNING, "Padding should be 0.\n");
 170
 171         tag        = get_le32(pb);
 172         chunk_size = get_le32(pb);
 173         switch (tag) {
 174         case MKTAG('v', 'r', 'a', 't'):
 175             if (get_le32(pb)) // var-rate-flag
 176                 s->packet_size = 0;
 177             url_fskip(pb, 4); // size-in-packets
 178             break;
 179         case MKTAG('d', 'a', 't', 'a'):
 180             c->data_size = chunk_size;
 181             break;
 182
 183         default:
 184             url_fskip(pb, chunk_size);
 185         }
 186     }
 187     return AVERROR_EOF;
 188 }
 189
 190 AVInputFormat qcp_demuxer = {
 191     .name           = "qcp",
 192     .long_name      = NULL_IF_CONFIG_SMALL("QCP format"),
 193     .priv_data_size = sizeof(QCPContext),
 194     .read_probe     = qcp_probe,
 195     .read_header    = qcp_read_header,
 196     .read_packet    = qcp_read_packet,
 197 };