summaryrefslogtreecommitdiff
path: root/libavformat/qcp.c
blob: c88c39b25dc7d1123470563e92d23a80326bddd1 (plain)
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,
};