Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tree: 6bd643a676
Fetching contributors…

Cannot retrieve contributors at this time

file 196 lines (170 sloc) 6.184 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196
/*
* QCP format (.qcp) demuxer
* Copyright (c) 2009 Kenan Gillet
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

/**
* @file
* QCP format (.qcp) demuxer
* @author Kenan Gillet
* @see RFC 3625: "The QCP File Format and Media Types for Speech Data"
* http://tools.ietf.org/html/rfc3625
*/

#include "libavutil/intreadwrite.h"
#include "avformat.h"

typedef struct {
    uint32_t data_size; ///< size of data chunk

#define QCP_MAX_MODE 4
    int16_t rates_per_mode[QCP_MAX_MODE+1]; ///< contains the packet size corresponding
                                            ///< to each mode, -1 if no size.
} QCPContext;

/**
* Last 15 out of 16 bytes of QCELP-13K GUID, as stored in the file;
* the first byte of the GUID can be either 0x41 or 0x42.
*/
static const uint8_t guid_qcelp_13k_part[15] = {
    0x6d, 0x7f, 0x5e, 0x15, 0xb1, 0xd0, 0x11, 0xba,
    0x91, 0x00, 0x80, 0x5f, 0xb4, 0xb9, 0x7e
};

/**
* EVRC GUID as stored in the file
*/
static const uint8_t guid_evrc[16] = {
    0x8d, 0xd4, 0x89, 0xe6, 0x76, 0x90, 0xb5, 0x46,
    0x91, 0xef, 0x73, 0x6a, 0x51, 0x00, 0xce, 0xb4
};

/**
* SMV GUID as stored in the file
*/
static const uint8_t guid_smv[16] = {
    0x75, 0x2b, 0x7c, 0x8d, 0x97, 0xa7, 0x49, 0xed,
    0x98, 0x5e, 0xd5, 0x3c, 0x8c, 0xc7, 0x5f, 0x84
};

/**
* @param guid contains at least 16 bytes
* @return 1 if the guid is a qcelp_13k guid, 0 otherwise
*/
static int is_qcelp_13k_guid(const uint8_t *guid) {
    return (guid[0] == 0x41 || guid[0] == 0x42)
        && !memcmp(guid+1, guid_qcelp_13k_part, sizeof(guid_qcelp_13k_part));
}

static int qcp_probe(AVProbeData *pd)
{
    if (AV_RL32(pd->buf ) == AV_RL32("RIFF") &&
        AV_RL64(pd->buf+8) == AV_RL64("QLCMfmt "))
        return AVPROBE_SCORE_MAX;
    return 0;
}

static int qcp_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
    AVIOContext *pb = s->pb;
    QCPContext *c = s->priv_data;
    AVStream *st = avformat_new_stream(s, NULL);
    uint8_t buf[16];
    int i, nb_rates;

    if (!st)
        return AVERROR(ENOMEM);

    avio_rb32(pb); // "RIFF"
    avio_skip(pb, 4 + 8 + 4 + 1 + 1); // filesize + "QLCMfmt " + chunk-size + major-version + minor-version

    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
    st->codec->channels = 1;
    avio_read(pb, buf, 16);
    if (is_qcelp_13k_guid(buf)) {
        st->codec->codec_id = CODEC_ID_QCELP;
    } else if (!memcmp(buf, guid_evrc, 16)) {
        av_log(s, AV_LOG_ERROR, "EVRC codec is not supported.\n");
        return AVERROR_PATCHWELCOME;
    } else if (!memcmp(buf, guid_smv, 16)) {
        av_log(s, AV_LOG_ERROR, "SMV codec is not supported.\n");
        return AVERROR_PATCHWELCOME;
    } else {
        av_log(s, AV_LOG_ERROR, "Unknown codec GUID.\n");
        return AVERROR_INVALIDDATA;
    }
    avio_skip(pb, 2 + 80); // codec-version + codec-name
    st->codec->bit_rate = avio_rl16(pb);

    s->packet_size = avio_rl16(pb);
    avio_skip(pb, 2); // block-size
    st->codec->sample_rate = avio_rl16(pb);
    avio_skip(pb, 2); // sample-size

    memset(c->rates_per_mode, -1, sizeof(c->rates_per_mode));
    nb_rates = avio_rl32(pb);
    nb_rates = FFMIN(nb_rates, 8);
    for (i=0; i<nb_rates; i++) {
        int size = avio_r8(pb);
        int mode = avio_r8(pb);
        if (mode > QCP_MAX_MODE) {
            av_log(s, AV_LOG_WARNING, "Unknown entry %d=>%d in rate-map-table.\n ", mode, size);
        } else
            c->rates_per_mode[mode] = size;
    }
    avio_skip(pb, 16 - 2*nb_rates + 20); // empty entries of rate-map-table + reserved

    return 0;
}

static int qcp_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    AVIOContext *pb = s->pb;
    QCPContext *c = s->priv_data;
    unsigned int chunk_size, tag;

    while(!url_feof(pb)) {
        if (c->data_size) {
            int pkt_size, ret, mode = avio_r8(pb);

            if (s->packet_size) {
                pkt_size = s->packet_size - 1;
            } else if (mode > QCP_MAX_MODE || (pkt_size = c->rates_per_mode[mode]) < 0) {
                c->data_size--;
                continue;
            }

            if (c->data_size <= pkt_size) {
                av_log(s, AV_LOG_WARNING, "Data chunk is too small.\n");
                pkt_size = c->data_size - 1;
            }

            if ((ret = av_get_packet(pb, pkt, pkt_size)) >= 0) {
                if (pkt_size != ret)
                    av_log(s, AV_LOG_ERROR, "Packet size is too small.\n");

                c->data_size -= pkt_size + 1;
            }
            return ret;
        }

        if (avio_tell(pb) & 1 && avio_r8(pb))
            av_log(s, AV_LOG_WARNING, "Padding should be 0.\n");

        tag = avio_rl32(pb);
        chunk_size = avio_rl32(pb);
        switch (tag) {
        case MKTAG('v', 'r', 'a', 't'):
            if (avio_rl32(pb)) // var-rate-flag
                s->packet_size = 0;
            avio_skip(pb, 4); // size-in-packets
            break;
        case MKTAG('d', 'a', 't', 'a'):
            c->data_size = chunk_size;
            break;

        default:
            avio_skip(pb, chunk_size);
        }
    }
    return AVERROR_EOF;
}

AVInputFormat ff_qcp_demuxer = {
    .name = "qcp",
    .long_name = NULL_IF_CONFIG_SMALL("QCP format"),
    .priv_data_size = sizeof(QCPContext),
    .read_probe = qcp_probe,
    .read_header = qcp_read_header,
    .read_packet = qcp_read_packet,
};
Something went wrong with that request. Please try again.