1/*
2 * R3D REDCODE demuxer
3 * Copyright (c) 2008 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22//#define DEBUG
23
24#include "libavutil/intreadwrite.h"
25#include "libavutil/dict.h"
26#include "libavutil/mathematics.h"
27#include "avformat.h"
28#include "internal.h"
29
30typedef struct {
31    unsigned video_offsets_count;
32    unsigned *video_offsets;
33    unsigned rdvo_offset;
34} R3DContext;
35
36typedef struct {
37    unsigned size;
38    uint32_t tag;
39    uint64_t offset;
40} Atom;
41
42static int read_atom(AVFormatContext *s, Atom *atom)
43{
44    atom->offset = avio_tell(s->pb);
45    atom->size = avio_rb32(s->pb);
46    if (atom->size < 8)
47        return -1;
48    atom->tag = avio_rl32(s->pb);
49    av_dlog(s, "atom %u %.4s offset %#"PRIx64"\n",
50            atom->size, (char*)&atom->tag, atom->offset);
51    return atom->size;
52}
53
54static int r3d_read_red1(AVFormatContext *s)
55{
56    AVStream *st = avformat_new_stream(s, NULL);
57    char filename[258];
58    int tmp;
59    int av_unused tmp2;
60
61    if (!st)
62        return AVERROR(ENOMEM);
63    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
64    st->codec->codec_id = CODEC_ID_JPEG2000;
65
66    tmp  = avio_r8(s->pb); // major version
67    tmp2 = avio_r8(s->pb); // minor version
68    av_dlog(s, "version %d.%d\n", tmp, tmp2);
69
70    tmp = avio_rb16(s->pb); // unknown
71    av_dlog(s, "unknown1 %d\n", tmp);
72
73    tmp = avio_rb32(s->pb);
74    avpriv_set_pts_info(st, 32, 1, tmp);
75
76    tmp = avio_rb32(s->pb); // filenum
77    av_dlog(s, "filenum %d\n", tmp);
78
79    avio_skip(s->pb, 32); // unknown
80
81    st->codec->width  = avio_rb32(s->pb);
82    st->codec->height = avio_rb32(s->pb);
83
84    tmp = avio_rb16(s->pb); // unknown
85    av_dlog(s, "unknown2 %d\n", tmp);
86
87    st->codec->time_base.den = avio_rb16(s->pb);
88    st->codec->time_base.num = avio_rb16(s->pb);
89
90    tmp = avio_r8(s->pb); // audio channels
91    av_dlog(s, "audio channels %d\n", tmp);
92    if (tmp > 0) {
93        AVStream *ast = avformat_new_stream(s, NULL);
94        if (!ast)
95            return AVERROR(ENOMEM);
96        ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
97        ast->codec->codec_id = CODEC_ID_PCM_S32BE;
98        ast->codec->channels = tmp;
99        avpriv_set_pts_info(ast, 32, 1, st->time_base.den);
100    }
101
102    avio_read(s->pb, filename, 257);
103    filename[sizeof(filename)-1] = 0;
104    av_dict_set(&st->metadata, "filename", filename, 0);
105
106    av_dlog(s, "filename %s\n", filename);
107    av_dlog(s, "resolution %dx%d\n", st->codec->width, st->codec->height);
108    av_dlog(s, "timescale %d\n", st->time_base.den);
109    av_dlog(s, "frame rate %d/%d\n",
110            st->codec->time_base.num, st->codec->time_base.den);
111
112    return 0;
113}
114
115static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)
116{
117    R3DContext *r3d = s->priv_data;
118    AVStream *st = s->streams[0];
119    int i;
120
121    r3d->video_offsets_count = (atom->size - 8) / 4;
122    r3d->video_offsets = av_malloc(atom->size);
123    if (!r3d->video_offsets)
124        return AVERROR(ENOMEM);
125
126    for (i = 0; i < r3d->video_offsets_count; i++) {
127        r3d->video_offsets[i] = avio_rb32(s->pb);
128        if (!r3d->video_offsets[i]) {
129            r3d->video_offsets_count = i;
130            break;
131        }
132        av_dlog(s, "video offset %d: %#x\n", i, r3d->video_offsets[i]);
133    }
134
135    if (st->codec->time_base.den)
136        st->duration = (uint64_t)r3d->video_offsets_count*
137            st->time_base.den*st->codec->time_base.num/st->codec->time_base.den;
138    av_dlog(s, "duration %"PRId64"\n", st->duration);
139
140    return 0;
141}
142
143static void r3d_read_reos(AVFormatContext *s)
144{
145    R3DContext *r3d = s->priv_data;
146    int av_unused tmp;
147
148    r3d->rdvo_offset = avio_rb32(s->pb);
149    avio_rb32(s->pb); // rdvs offset
150    avio_rb32(s->pb); // rdao offset
151    avio_rb32(s->pb); // rdas offset
152
153    tmp = avio_rb32(s->pb);
154    av_dlog(s, "num video chunks %d\n", tmp);
155
156    tmp = avio_rb32(s->pb);
157    av_dlog(s, "num audio chunks %d\n", tmp);
158
159    avio_skip(s->pb, 6*4);
160}
161
162static int r3d_read_header(AVFormatContext *s, AVFormatParameters *ap)
163{
164    R3DContext *r3d = s->priv_data;
165    Atom atom;
166    int ret;
167
168    if (read_atom(s, &atom) < 0) {
169        av_log(s, AV_LOG_ERROR, "error reading atom\n");
170        return -1;
171    }
172    if (atom.tag == MKTAG('R','E','D','1')) {
173        if ((ret = r3d_read_red1(s)) < 0) {
174            av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");
175            return ret;
176        }
177    } else {
178        av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");
179        return -1;
180    }
181
182    s->data_offset = avio_tell(s->pb);
183    av_dlog(s, "data offset %#"PRIx64"\n", s->data_offset);
184    if (!s->pb->seekable)
185        return 0;
186    // find REOB/REOF/REOS to load index
187    avio_seek(s->pb, avio_size(s->pb)-48-8, SEEK_SET);
188    if (read_atom(s, &atom) < 0)
189        av_log(s, AV_LOG_ERROR, "error reading end atom\n");
190
191    if (atom.tag != MKTAG('R','E','O','B') &&
192        atom.tag != MKTAG('R','E','O','F') &&
193        atom.tag != MKTAG('R','E','O','S'))
194        goto out;
195
196    r3d_read_reos(s);
197
198    if (r3d->rdvo_offset) {
199        avio_seek(s->pb, r3d->rdvo_offset, SEEK_SET);
200        if (read_atom(s, &atom) < 0)
201            av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");
202        if (atom.tag == MKTAG('R','D','V','O')) {
203            if (r3d_read_rdvo(s, &atom) < 0)
204                av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");
205        }
206    }
207
208 out:
209    avio_seek(s->pb, s->data_offset, SEEK_SET);
210    return 0;
211}
212
213static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)
214{
215    AVStream *st = s->streams[0];
216    int tmp;
217    int av_unused tmp2;
218    uint64_t pos = avio_tell(s->pb);
219    unsigned dts;
220    int ret;
221
222    dts = avio_rb32(s->pb);
223
224    tmp = avio_rb32(s->pb);
225    av_dlog(s, "frame num %d\n", tmp);
226
227    tmp  = avio_r8(s->pb); // major version
228    tmp2 = avio_r8(s->pb); // minor version
229    av_dlog(s, "version %d.%d\n", tmp, tmp2);
230
231    tmp = avio_rb16(s->pb); // unknown
232    av_dlog(s, "unknown %d\n", tmp);
233
234    if (tmp > 4) {
235        tmp = avio_rb16(s->pb); // unknown
236        av_dlog(s, "unknown %d\n", tmp);
237
238        tmp = avio_rb16(s->pb); // unknown
239        av_dlog(s, "unknown %d\n", tmp);
240
241        tmp = avio_rb32(s->pb);
242        av_dlog(s, "width %d\n", tmp);
243        tmp = avio_rb32(s->pb);
244        av_dlog(s, "height %d\n", tmp);
245
246        tmp = avio_rb32(s->pb);
247        av_dlog(s, "metadata len %d\n", tmp);
248    }
249    tmp = atom->size - 8 - (avio_tell(s->pb) - pos);
250    if (tmp < 0)
251        return -1;
252    ret = av_get_packet(s->pb, pkt, tmp);
253    if (ret < 0) {
254        av_log(s, AV_LOG_ERROR, "error reading video packet\n");
255        return -1;
256    }
257
258    pkt->stream_index = 0;
259    pkt->dts = dts;
260    if (st->codec->time_base.den)
261        pkt->duration = (uint64_t)st->time_base.den*
262            st->codec->time_base.num/st->codec->time_base.den;
263    av_dlog(s, "pkt dts %"PRId64" duration %d\n", pkt->dts, pkt->duration);
264
265    return 0;
266}
267
268static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
269{
270    AVStream *st = s->streams[1];
271    int av_unused tmp, tmp2;
272    int samples, size;
273    uint64_t pos = avio_tell(s->pb);
274    unsigned dts;
275    int ret;
276
277    dts = avio_rb32(s->pb);
278
279    st->codec->sample_rate = avio_rb32(s->pb);
280
281    samples = avio_rb32(s->pb);
282
283    tmp = avio_rb32(s->pb);
284    av_dlog(s, "packet num %d\n", tmp);
285
286    tmp = avio_rb16(s->pb); // unkown
287    av_dlog(s, "unknown %d\n", tmp);
288
289    tmp  = avio_r8(s->pb); // major version
290    tmp2 = avio_r8(s->pb); // minor version
291    av_dlog(s, "version %d.%d\n", tmp, tmp2);
292
293    tmp = avio_rb32(s->pb); // unknown
294    av_dlog(s, "unknown %d\n", tmp);
295
296    size = atom->size - 8 - (avio_tell(s->pb) - pos);
297    if (size < 0)
298        return -1;
299    ret = av_get_packet(s->pb, pkt, size);
300    if (ret < 0) {
301        av_log(s, AV_LOG_ERROR, "error reading audio packet\n");
302        return ret;
303    }
304
305    pkt->stream_index = 1;
306    pkt->dts = dts;
307    pkt->duration = av_rescale(samples, st->time_base.den, st->codec->sample_rate);
308    av_dlog(s, "pkt dts %"PRId64" duration %d samples %d sample rate %d\n",
309            pkt->dts, pkt->duration, samples, st->codec->sample_rate);
310
311    return 0;
312}
313
314static int r3d_read_packet(AVFormatContext *s, AVPacket *pkt)
315{
316    Atom atom;
317    int err = 0;
318
319    while (!err) {
320        if (read_atom(s, &atom) < 0) {
321            err = -1;
322            break;
323        }
324        switch (atom.tag) {
325        case MKTAG('R','E','D','V'):
326            if (s->streams[0]->discard == AVDISCARD_ALL)
327                goto skip;
328            if (!(err = r3d_read_redv(s, pkt, &atom)))
329                return 0;
330            break;
331        case MKTAG('R','E','D','A'):
332            if (s->nb_streams < 2)
333                return -1;
334            if (s->streams[1]->discard == AVDISCARD_ALL)
335                goto skip;
336            if (!(err = r3d_read_reda(s, pkt, &atom)))
337                return 0;
338            break;
339        default:
340        skip:
341            avio_skip(s->pb, atom.size-8);
342        }
343    }
344    return err;
345}
346
347static int r3d_probe(AVProbeData *p)
348{
349    if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))
350        return AVPROBE_SCORE_MAX;
351    return 0;
352}
353
354static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
355{
356    AVStream *st = s->streams[0]; // video stream
357    R3DContext *r3d = s->priv_data;
358    int frame_num;
359
360    if (!st->codec->time_base.num || !st->time_base.den)
361        return -1;
362
363    frame_num = sample_time*st->codec->time_base.den/
364        ((int64_t)st->codec->time_base.num*st->time_base.den);
365    av_dlog(s, "seek frame num %d timestamp %"PRId64"\n",
366            frame_num, sample_time);
367
368    if (frame_num < r3d->video_offsets_count) {
369        avio_seek(s->pb, r3d->video_offsets_count, SEEK_SET);
370    } else {
371        av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);
372        return -1;
373    }
374
375    return 0;
376}
377
378static int r3d_close(AVFormatContext *s)
379{
380    R3DContext *r3d = s->priv_data;
381
382    av_freep(&r3d->video_offsets);
383
384    return 0;
385}
386
387AVInputFormat ff_r3d_demuxer = {
388    .name           = "r3d",
389    .long_name      = NULL_IF_CONFIG_SMALL("REDCODE R3D format"),
390    .priv_data_size = sizeof(R3DContext),
391    .read_probe     = r3d_probe,
392    .read_header    = r3d_read_header,
393    .read_packet    = r3d_read_packet,
394    .read_close     = r3d_close,
395    .read_seek      = r3d_seek,
396};
397