summaryrefslogtreecommitdiffstats
path: root/libavformat/bink.c
blob: c1206505f35d4bcb2d97daec1c6d7e4132296b3e (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
272
273
274
275
276
277
/*
 * Bink demuxer
 * Copyright (c) 2008-2010 Peter Ross (pross@xvid.org)
 * Copyright (c) 2009 Daniel Verkamp (daniel@drv.nu)
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Bink demuxer
 *
 * Technical details here:
 *  http://wiki.multimedia.cx/index.php?title=Bink_Container
 */

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

enum BinkAudFlags {
    BINK_AUD_16BITS = 0x4000, ///< prefer 16-bit output
    BINK_AUD_STEREO = 0x2000,
    BINK_AUD_USEDCT = 0x1000,
};

#define BINK_EXTRADATA_SIZE     1
#define BINK_MAX_AUDIO_TRACKS   256
#define BINK_MAX_WIDTH          7680
#define BINK_MAX_HEIGHT         4800

typedef struct {
    uint32_t file_size;

    uint32_t num_audio_tracks;
    int current_track;      ///< audio track to return in next packet
    int64_t video_pts;
    int64_t audio_pts[BINK_MAX_AUDIO_TRACKS];

    uint32_t remain_packet_size;
} BinkDemuxContext;

static int probe(AVProbeData *p)
{
    const uint8_t *b = p->buf;

    if ( b[0] == 'B' && b[1] == 'I' && b[2] == 'K' &&
        (b[3] == 'b' || b[3] == 'f' || b[3] == 'g' || b[3] == 'h' || b[3] == 'i') &&
        AV_RL32(b+8) > 0 &&  // num_frames
        AV_RL32(b+20) > 0 && AV_RL32(b+20) <= BINK_MAX_WIDTH &&
        AV_RL32(b+24) > 0 && AV_RL32(b+24) <= BINK_MAX_HEIGHT &&
        AV_RL32(b+28) > 0 && AV_RL32(b+32) > 0)  // fps num,den
        return AVPROBE_SCORE_MAX;
    return 0;
}

static int read_header(AVFormatContext *s)
{
    BinkDemuxContext *bink = s->priv_data;
    AVIOContext *pb = s->pb;
    uint32_t fps_num, fps_den;
    AVStream *vst, *ast;
    unsigned int i;
    uint32_t pos, next_pos;
    uint16_t flags;
    int keyframe;

    vst = avformat_new_stream(s, NULL);
    if (!vst)
        return AVERROR(ENOMEM);

    vst->codec->codec_tag = avio_rl32(pb);

    bink->file_size = avio_rl32(pb) + 8;
    vst->duration   = avio_rl32(pb);

    if (vst->duration > 1000000) {
        av_log(s, AV_LOG_ERROR, "invalid header: more than 1000000 frames\n");
        return AVERROR(EIO);
    }

    if (avio_rl32(pb) > bink->file_size) {
        av_log(s, AV_LOG_ERROR,
               "invalid header: largest frame size greater than file size\n");
        return AVERROR(EIO);
    }

    avio_skip(pb, 4);

    vst->codec->width  = avio_rl32(pb);
    vst->codec->height = avio_rl32(pb);

    fps_num = avio_rl32(pb);
    fps_den = avio_rl32(pb);
    if (fps_num == 0 || fps_den == 0) {
        av_log(s, AV_LOG_ERROR, "invalid header: invalid fps (%d/%d)\n", fps_num, fps_den);
        return AVERROR(EIO);
    }
    avpriv_set_pts_info(vst, 64, fps_den, fps_num);

    vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
    vst->codec->codec_id   = CODEC_ID_BINKVIDEO;
    vst->codec->extradata  = av_mallocz(4 + FF_INPUT_BUFFER_PADDING_SIZE);
    vst->codec->extradata_size = 4;
    avio_read(pb, vst->codec->extradata, 4);

    bink->num_audio_tracks = avio_rl32(pb);

    if (bink->num_audio_tracks > BINK_MAX_AUDIO_TRACKS) {
        av_log(s, AV_LOG_ERROR,
               "invalid header: more than "AV_STRINGIFY(BINK_MAX_AUDIO_TRACKS)" audio tracks (%d)\n",
               bink->num_audio_tracks);
        return AVERROR(EIO);
    }

    if (bink->num_audio_tracks) {
        avio_skip(pb, 4 * bink->num_audio_tracks);

        for (i = 0; i < bink->num_audio_tracks; i++) {
            ast = avformat_new_stream(s, NULL);
            if (!ast)
                return AVERROR(ENOMEM);
            ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
            ast->codec->codec_tag   = 0;
            ast->codec->sample_rate = avio_rl16(pb);
            avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
            flags = avio_rl16(pb);
            ast->codec->codec_id = flags & BINK_AUD_USEDCT ?
                                   CODEC_ID_BINKAUDIO_DCT : CODEC_ID_BINKAUDIO_RDFT;
            ast->codec->channels = flags & BINK_AUD_STEREO ? 2 : 1;
            ast->codec->extradata = av_mallocz(4 + FF_INPUT_BUFFER_PADDING_SIZE);
            if (!ast->codec->extradata)
                return AVERROR(ENOMEM);
            ast->codec->extradata_size = 4;
            AV_WL32(ast->codec->extradata, vst->codec->codec_tag);
        }

        for (i = 0; i < bink->num_audio_tracks; i++)
            s->streams[i + 1]->id = avio_rl32(pb);
    }

    /* frame index table */
    next_pos = avio_rl32(pb);
    for (i = 0; i < vst->duration; i++) {
        pos = next_pos;
        if (i == vst->duration - 1) {
            next_pos = bink->file_size;
            keyframe = 0;
        } else {
            next_pos = avio_rl32(pb);
            keyframe = pos & 1;
        }
        pos &= ~1;
        next_pos &= ~1;

        if (next_pos <= pos) {
            av_log(s, AV_LOG_ERROR, "invalid frame index table\n");
            return AVERROR(EIO);
        }
        av_add_index_entry(vst, pos, i, next_pos - pos, 0,
                           keyframe ? AVINDEX_KEYFRAME : 0);
    }

    avio_skip(pb, 4);

    bink->current_track = -1;
    return 0;
}

static int read_packet(AVFormatContext *s, AVPacket *pkt)
{
    BinkDemuxContext *bink = s->priv_data;
    AVIOContext *pb = s->pb;
    int ret;

    if (bink->current_track < 0) {
        int index_entry;
        AVStream *st = s->streams[0]; // stream 0 is video stream with index

        if (bink->video_pts >= st->duration)
            return AVERROR(EIO);

        index_entry = av_index_search_timestamp(st, bink->video_pts,
                                                AVSEEK_FLAG_ANY);
        if (index_entry < 0) {
            av_log(s, AV_LOG_ERROR,
                   "could not find index entry for frame %"PRId64"\n",
                   bink->video_pts);
            return AVERROR(EIO);
        }

        bink->remain_packet_size = st->index_entries[index_entry].size;
        bink->current_track = 0;
    }

    while (bink->current_track < bink->num_audio_tracks) {
        uint32_t audio_size = avio_rl32(pb);
        if (audio_size > bink->remain_packet_size - 4) {
            av_log(s, AV_LOG_ERROR,
                   "frame %"PRId64": audio size in header (%u) > size of packet left (%u)\n",
                   bink->video_pts, audio_size, bink->remain_packet_size);
            return AVERROR(EIO);
        }
        bink->remain_packet_size -= 4 + audio_size;
        bink->current_track++;
        if (audio_size >= 4) {
            /* get one audio packet per track */
            if ((ret = av_get_packet(pb, pkt, audio_size)) < 0)
                return ret;
            pkt->stream_index = bink->current_track;
            pkt->pts = bink->audio_pts[bink->current_track - 1];

            /* Each audio packet reports the number of decompressed samples
               (in bytes). We use this value to calcuate the audio PTS */
            if (pkt->size >= 4)
                bink->audio_pts[bink->current_track -1] +=
                    AV_RL32(pkt->data) / (2 * s->streams[bink->current_track]->codec->channels);
            return 0;
        } else {
            avio_skip(pb, audio_size);
        }
    }

    /* get video packet */
    if ((ret = av_get_packet(pb, pkt, bink->remain_packet_size)) < 0)
        return ret;
    pkt->stream_index = 0;
    pkt->pts = bink->video_pts++;
    pkt->flags |= AV_PKT_FLAG_KEY;

    /* -1 instructs the next call to read_packet() to read the next frame */
    bink->current_track = -1;

    return 0;
}

static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
    BinkDemuxContext *bink = s->priv_data;
    AVStream *vst = s->streams[0];

    if (!s->pb->seekable)
        return -1;

    /* seek to the first frame */
    if (avio_seek(s->pb, vst->index_entries[0].pos, SEEK_SET) < 0)
        return -1;

    bink->video_pts = 0;
    memset(bink->audio_pts, 0, sizeof(bink->audio_pts));
    bink->current_track = -1;
    return 0;
}

AVInputFormat ff_bink_demuxer = {
    .name           = "bink",
    .long_name      = NULL_IF_CONFIG_SMALL("Bink"),
    .priv_data_size = sizeof(BinkDemuxContext),
    .read_probe     = probe,
    .read_header    = read_header,
    .read_packet    = read_packet,
    .read_seek      = read_seek,
};
OpenPOWER on IntegriCloud