summaryrefslogtreecommitdiffstats
path: root/libavformat/idroqdec.c
blob: 6f843d7bc939f869915c4470a58e12bffc573513 (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
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
/*
 * id RoQ (.roq) File Demuxer
 * Copyright (c) 2003 The ffmpeg Project
 *
 * 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
 * id RoQ format file demuxer
 * by Mike Melanson (melanson@pcisys.net)
 * for more information on the .roq file format, visit:
 *   http://www.csse.monash.edu.au/~timf/
 */

#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"

#define RoQ_MAGIC_NUMBER 0x1084
#define RoQ_CHUNK_PREAMBLE_SIZE 8
#define RoQ_AUDIO_SAMPLE_RATE 22050
#define RoQ_CHUNKS_TO_SCAN 30

#define RoQ_INFO           0x1001
#define RoQ_QUAD_CODEBOOK  0x1002
#define RoQ_QUAD_VQ        0x1011
#define RoQ_SOUND_MONO     0x1020
#define RoQ_SOUND_STEREO   0x1021

typedef struct RoqDemuxContext {

    int frame_rate;
    int width;
    int height;
    int audio_channels;

    int video_stream_index;
    int audio_stream_index;

    int64_t video_pts;
    unsigned int audio_frame_count;

} RoqDemuxContext;

static int roq_probe(AVProbeData *p)
{
    if ((AV_RL16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
        (AV_RL32(&p->buf[2]) != 0xFFFFFFFF))
        return 0;

    return AVPROBE_SCORE_MAX;
}

static int roq_read_header(AVFormatContext *s)
{
    RoqDemuxContext *roq = s->priv_data;
    AVIOContext *pb = s->pb;
    unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];

    /* get the main header */
    if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
        RoQ_CHUNK_PREAMBLE_SIZE)
        return AVERROR(EIO);
    roq->frame_rate = AV_RL16(&preamble[6]);

    /* init private context parameters */
    roq->width = roq->height = roq->audio_channels = roq->video_pts =
    roq->audio_frame_count = 0;
    roq->audio_stream_index = -1;
    roq->video_stream_index = -1;

    s->ctx_flags |= AVFMTCTX_NOHEADER;

    return 0;
}

static int roq_read_packet(AVFormatContext *s,
                           AVPacket *pkt)
{
    RoqDemuxContext *roq = s->priv_data;
    AVIOContext *pb = s->pb;
    int ret = 0;
    unsigned int chunk_size;
    unsigned int chunk_type;
    unsigned int codebook_size;
    unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
    int packet_read = 0;
    int64_t codebook_offset;

    while (!packet_read) {

        if (url_feof(s->pb))
            return AVERROR(EIO);

        /* get the next chunk preamble */
        if ((ret = avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) !=
            RoQ_CHUNK_PREAMBLE_SIZE)
            return AVERROR(EIO);

        chunk_type = AV_RL16(&preamble[0]);
        chunk_size = AV_RL32(&preamble[2]);
        if(chunk_size > INT_MAX)
            return AVERROR_INVALIDDATA;

        chunk_size = ffio_limit(pb, chunk_size);

        switch (chunk_type) {

        case RoQ_INFO:
            if (roq->video_stream_index == -1) {
                AVStream *st = avformat_new_stream(s, NULL);
                if (!st)
                    return AVERROR(ENOMEM);
                avpriv_set_pts_info(st, 63, 1, roq->frame_rate);
                roq->video_stream_index = st->index;
                st->codec->codec_type   = AVMEDIA_TYPE_VIDEO;
                st->codec->codec_id     = AV_CODEC_ID_ROQ;
                st->codec->codec_tag    = 0;  /* no fourcc */

                if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != RoQ_CHUNK_PREAMBLE_SIZE)
                    return AVERROR(EIO);
                st->codec->width  = roq->width  = AV_RL16(preamble);
                st->codec->height = roq->height = AV_RL16(preamble + 2);
                break;
            }
            /* don't care about this chunk anymore */
            avio_skip(pb, RoQ_CHUNK_PREAMBLE_SIZE);
            break;

        case RoQ_QUAD_CODEBOOK:
            /* packet needs to contain both this codebook and next VQ chunk */
            codebook_offset = avio_tell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
            codebook_size = chunk_size;
            avio_skip(pb, codebook_size);
            if (avio_read(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) !=
                RoQ_CHUNK_PREAMBLE_SIZE)
                return AVERROR(EIO);
            chunk_size = AV_RL32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 +
                codebook_size;

            /* rewind */
            avio_seek(pb, codebook_offset, SEEK_SET);

            /* load up the packet */
            ret= av_get_packet(pb, pkt, chunk_size);
            if (ret != chunk_size)
                return AVERROR(EIO);
            pkt->stream_index = roq->video_stream_index;
            pkt->pts = roq->video_pts++;

            packet_read = 1;
            break;

        case RoQ_SOUND_MONO:
        case RoQ_SOUND_STEREO:
            if (roq->audio_stream_index == -1) {
                AVStream *st = avformat_new_stream(s, NULL);
                if (!st)
                    return AVERROR(ENOMEM);
                avpriv_set_pts_info(st, 32, 1, RoQ_AUDIO_SAMPLE_RATE);
                roq->audio_stream_index = st->index;
                st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
                st->codec->codec_id = AV_CODEC_ID_ROQ_DPCM;
                st->codec->codec_tag = 0;  /* no tag */
                if (chunk_type == RoQ_SOUND_STEREO) {
                    st->codec->channels       = 2;
                    st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
                } else {
                    st->codec->channels       = 1;
                    st->codec->channel_layout = AV_CH_LAYOUT_MONO;
                }
                roq->audio_channels    = st->codec->channels;
                st->codec->sample_rate = RoQ_AUDIO_SAMPLE_RATE;
                st->codec->bits_per_coded_sample = 16;
                st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
                    st->codec->bits_per_coded_sample;
                st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
            }
        case RoQ_QUAD_VQ:
            /* load up the packet */
            if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
                return AVERROR(EIO);
            /* copy over preamble */
            memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);

            if (chunk_type == RoQ_QUAD_VQ) {
                pkt->stream_index = roq->video_stream_index;
                pkt->pts = roq->video_pts++;
            } else {
                pkt->stream_index = roq->audio_stream_index;
                pkt->pts = roq->audio_frame_count;
                roq->audio_frame_count += (chunk_size / roq->audio_channels);
            }

            pkt->pos= avio_tell(pb);
            ret = avio_read(pb, pkt->data + RoQ_CHUNK_PREAMBLE_SIZE,
                chunk_size);
            if (ret != chunk_size)
                ret = AVERROR(EIO);

            packet_read = 1;
            break;

        default:
            av_log(s, AV_LOG_ERROR, "  unknown RoQ chunk (%04X)\n", chunk_type);
            return AVERROR_INVALIDDATA;
        }
    }

    return ret;
}

AVInputFormat ff_roq_demuxer = {
    .name           = "roq",
    .long_name      = NULL_IF_CONFIG_SMALL("id RoQ"),
    .priv_data_size = sizeof(RoqDemuxContext),
    .read_probe     = roq_probe,
    .read_header    = roq_read_header,
    .read_packet    = roq_read_packet,
};
OpenPOWER on IntegriCloud