summaryrefslogtreecommitdiff
path: root/libavformat/cdxl.c
blob: 065148360ef8e4b14d552caccbee9ac866d53136 (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
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
/*
 * CDXL demuxer
 * Copyright (c) 2011-2012 Paul B Mahol
 *
 * 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
 */

#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/parseutils.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "internal.h"

#define CDXL_HEADER_SIZE 32

typedef struct CDXLDemuxContext {
    AVClass     *class;
    int         read_chunk;
    AVRational  frate;
    int         srate;
    AVRational  frame_rate;
    int         sample_rate;
    uint8_t     header[CDXL_HEADER_SIZE];
    int         video_stream_index;
    int         audio_stream_index;
    int64_t     filesize;
    int64_t     pos;
} CDXLDemuxContext;

static int cdxl_read_probe(const AVProbeData *p)
{
    int score = AVPROBE_SCORE_EXTENSION + 10;
    const uint8_t *buf = p->buf;

    if (p->buf_size < CDXL_HEADER_SIZE)
        return 0;

    /* check type */
    if (buf[0] > 1)
        return 0;

    /* reserved bytes should always be set to 0 */
    if (AV_RL24(&buf[29]))
        return 0;

    /* check palette size */
    if (!AV_RN16(&buf[20]))
        return 0;
    if (buf[0] == 1 && AV_RB16(&buf[20]) > 512)
        return 0;
    if (buf[0] == 0 && AV_RB16(&buf[20]) > 768)
        return 0;

    if (!AV_RN16(&buf[22]) && AV_RN16(&buf[24]))
        return 0;

    if (buf[0] == 0 && (!buf[26] || !AV_RB16(&buf[24])))
        return 0;

    /* check number of planes */
    if (buf[19] != 6 && buf[19] != 8 && buf[19] != 24)
        return 0;

    if (buf[18])
        return 0;

    /* check widh and height */
    if (AV_RB16(&buf[14]) > 640 || AV_RB16(&buf[16]) > 480 ||
        AV_RB16(&buf[14]) == 0 || AV_RB16(&buf[16]) == 0)
        return 0;

    /* chunk size */
    if (AV_RB32(&buf[2]) <= AV_RB16(&buf[20]) + AV_RB16(&buf[22]) * (1 + !!(buf[1] & 0x10)) + CDXL_HEADER_SIZE)
        return 0;

    /* previous chunk size */
    if (AV_RN32(&buf[6]))
        score /= 2;

    /* current frame number, usually starts from 1 */
    if (AV_RB32(&buf[10]) != 1)
        score /= 2;

    return score;
}

static int cdxl_read_header(AVFormatContext *s)
{
    CDXLDemuxContext *cdxl = s->priv_data;

    cdxl->read_chunk         =  0;
    cdxl->video_stream_index = -1;
    cdxl->audio_stream_index = -1;

    cdxl->filesize = avio_size(s->pb);

    s->ctx_flags |= AVFMTCTX_NOHEADER;

    return 0;
}

static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    CDXLDemuxContext *cdxl = s->priv_data;
    AVIOContext *pb = s->pb;
    uint32_t current_size, video_size, image_size;
    uint16_t audio_size, palette_size, width, height;
    int      channels, type, format, ret;

    if (avio_feof(pb))
        return AVERROR_EOF;

    if (!cdxl->read_chunk) {
        cdxl->pos = avio_tell(pb);
        if (avio_read(pb, cdxl->header, CDXL_HEADER_SIZE) != CDXL_HEADER_SIZE)
            return AVERROR_EOF;
    }
    if (cdxl->header[0] > 1) {
        av_log(s, AV_LOG_ERROR, "unsupported cdxl file\n");
        return AVERROR_INVALIDDATA;
    }

    type         = cdxl->header[0];
    channels     = 1 + !!(cdxl->header[1] & 0x10);
    format       = cdxl->header[1] & 0xE0;
    current_size = AV_RB32(&cdxl->header[2]);
    width        = AV_RB16(&cdxl->header[14]);
    height       = AV_RB16(&cdxl->header[16]);
    palette_size = AV_RB16(&cdxl->header[20]);
    audio_size   = AV_RB16(&cdxl->header[22]) * channels;
    cdxl->srate  = AV_RB16(&cdxl->header[24]);
    if (!cdxl->srate && audio_size)
        cdxl->srate = cdxl->sample_rate;
    cdxl->frate.num = cdxl->header[26];
    cdxl->frate.den = 1;
    if (cdxl->header[19] == 0 ||
        FFALIGN(width, 16) * (uint64_t)height * cdxl->header[19] > INT_MAX)
        return AVERROR_INVALIDDATA;
    if (format == 0x20)
        image_size = width * height * cdxl->header[19] / 8;
    else
        image_size = FFALIGN(width, 16) * height * cdxl->header[19] / 8;
    video_size   = palette_size + image_size;

    if ((type == 1 && palette_size > 512) ||
        (type == 0 && palette_size > 768))
        return AVERROR_INVALIDDATA;
    if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE)
        return AVERROR_INVALIDDATA;

    if (!cdxl->frate.num && audio_size && cdxl->srate > 0) {
        cdxl->frate = (AVRational){ cdxl->srate, audio_size };
    } else if (!cdxl->frate.num) {
        cdxl->frate = cdxl->frame_rate;
    }

    if (cdxl->read_chunk && audio_size) {
        if (cdxl->audio_stream_index == -1) {
            AVStream *st = avformat_new_stream(s, NULL);
            if (!st)
                return AVERROR(ENOMEM);

            st->codecpar->codec_type    = AVMEDIA_TYPE_AUDIO;
            st->codecpar->codec_tag     = 0;
            st->codecpar->codec_id      = AV_CODEC_ID_PCM_S8_PLANAR;
            av_channel_layout_default(&st->codecpar->ch_layout, channels);
            st->codecpar->sample_rate= cdxl->srate;
            st->start_time           = 0;
            cdxl->audio_stream_index = st->index;
            avpriv_set_pts_info(st, 64, 1, cdxl->srate);
            if (current_size && cdxl->filesize > 0 && audio_size > 0)
                st->duration = (cdxl->filesize / current_size) * audio_size / channels;
        }

        ret = av_get_packet(pb, pkt, audio_size);
        if (ret < 0)
            return ret;
        pkt->stream_index = cdxl->audio_stream_index;
        pkt->pos          = cdxl->pos;
        pkt->duration     = audio_size / channels;
        cdxl->read_chunk  = 0;
    } else {
        if (cdxl->video_stream_index == -1) {
            AVStream *st = avformat_new_stream(s, NULL);
            if (!st)
                return AVERROR(ENOMEM);

            st->codecpar->codec_type    = AVMEDIA_TYPE_VIDEO;
            st->codecpar->codec_tag     = 0;
            st->codecpar->codec_id      = AV_CODEC_ID_CDXL;
            st->codecpar->width         = width;
            st->codecpar->height        = height;

            if (current_size && cdxl->filesize > 0)
                st->nb_frames = cdxl->filesize / current_size;
            st->start_time           = 0;
            cdxl->video_stream_index = st->index;
            avpriv_set_pts_info(st, 64, cdxl->frate.den, cdxl->frate.num);
        }

        if ((ret = av_new_packet(pkt, video_size + CDXL_HEADER_SIZE)) < 0)
            return ret;
        memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE);
        ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size);
        if (ret < 0) {
            return ret;
        }
        av_shrink_packet(pkt, CDXL_HEADER_SIZE + ret);
        pkt->stream_index  = cdxl->video_stream_index;
        pkt->flags        |= AV_PKT_FLAG_KEY;
        pkt->pos           = cdxl->pos;
        pkt->duration      = 1;
        cdxl->read_chunk   = audio_size;
    }

    if (!cdxl->read_chunk)
        avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE);
    return ret;
}

static int read_seek(AVFormatContext *s, int stream_index,
                     int64_t timestamp, int flags)
{
    CDXLDemuxContext *cdxl = s->priv_data;

    cdxl->read_chunk = 0;

    return -1;
}

#define OFFSET(x) offsetof(CDXLDemuxContext, x)
static const AVOption cdxl_options[] = {
    { "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64=11025 }, 8000, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
    { "frame_rate", "", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, { .str="15" }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
    { NULL },
};

static const AVClass cdxl_demuxer_class = {
    .class_name = "CDXL demuxer",
    .item_name  = av_default_item_name,
    .option     = cdxl_options,
    .version    = LIBAVUTIL_VERSION_INT,
};

const AVInputFormat ff_cdxl_demuxer = {
    .name           = "cdxl",
    .long_name      = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
    .priv_data_size = sizeof(CDXLDemuxContext),
    .priv_class     = &cdxl_demuxer_class,
    .read_probe     = cdxl_read_probe,
    .read_header    = cdxl_read_header,
    .read_packet    = cdxl_read_packet,
    .read_seek      = read_seek,
    .extensions     = "cdxl,xl",
    .flags          = AVFMT_GENERIC_INDEX,
};