FFmpeg: libavformat/r3d.c Source File

00001 /*
00002  * R3D REDCODE demuxer
00003  * Copyright (c) 2008 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 //#define DEBUG
00023 
00024 #include "libavutil/intreadwrite.h"
00025 #include "libavutil/dict.h"
00026 #include "avformat.h"
00027 
00028 typedef struct {
00029     unsigned video_offsets_count;
00030     unsigned *video_offsets;
00031     unsigned rdvo_offset;
00032 } R3DContext;
00033 
00034 typedef struct {
00035     unsigned size;
00036     uint32_t tag;
00037     uint64_t offset;
00038 } Atom;
00039 
00040 static int read_atom(AVFormatContext *s, Atom *atom)
00041 {
00042     atom->offset = avio_tell(s->pb);
00043     atom->size = avio_rb32(s->pb);
00044     if (atom->size < 8)
00045         return -1;
00046     atom->tag = avio_rl32(s->pb);
00047     av_dlog(s, "atom %u %.4s offset %#"PRIx64"\n",
00048             atom->size, (char*)&atom->tag, atom->offset);
00049     return atom->size;
00050 }
00051 
00052 static int r3d_read_red1(AVFormatContext *s)
00053 {
00054     AVStream *st = av_new_stream(s, 0);
00055     char filename[258];
00056     int tmp;
00057     int av_unused tmp2;
00058 
00059     if (!st)
00060         return AVERROR(ENOMEM);
00061     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00062     st->codec->codec_id = CODEC_ID_JPEG2000;
00063 
00064     tmp  = avio_r8(s->pb); // major version
00065     tmp2 = avio_r8(s->pb); // minor version
00066     av_dlog(s, "version %d.%d\n", tmp, tmp2);
00067 
00068     tmp = avio_rb16(s->pb); // unknown
00069     av_dlog(s, "unknown1 %d\n", tmp);
00070 
00071     tmp = avio_rb32(s->pb);
00072     av_set_pts_info(st, 32, 1, tmp);
00073 
00074     tmp = avio_rb32(s->pb); // filenum
00075     av_dlog(s, "filenum %d\n", tmp);
00076 
00077     avio_skip(s->pb, 32); // unknown
00078 
00079     st->codec->width  = avio_rb32(s->pb);
00080     st->codec->height = avio_rb32(s->pb);
00081 
00082     tmp = avio_rb16(s->pb); // unknown
00083     av_dlog(s, "unknown2 %d\n", tmp);
00084 
00085     st->codec->time_base.den = avio_rb16(s->pb);
00086     st->codec->time_base.num = avio_rb16(s->pb);
00087 
00088     tmp = avio_r8(s->pb); // audio channels
00089     av_dlog(s, "audio channels %d\n", tmp);
00090     if (tmp > 0) {
00091         AVStream *ast = av_new_stream(s, 1);
00092         if (!ast)
00093             return AVERROR(ENOMEM);
00094         ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00095         ast->codec->codec_id = CODEC_ID_PCM_S32BE;
00096         ast->codec->channels = tmp;
00097         av_set_pts_info(ast, 32, 1, st->time_base.den);
00098     }
00099 
00100     avio_read(s->pb, filename, 257);
00101     filename[sizeof(filename)-1] = 0;
00102     av_dict_set(&st->metadata, "filename", filename, 0);
00103 
00104     av_dlog(s, "filename %s\n", filename);
00105     av_dlog(s, "resolution %dx%d\n", st->codec->width, st->codec->height);
00106     av_dlog(s, "timescale %d\n", st->time_base.den);
00107     av_dlog(s, "frame rate %d/%d\n",
00108             st->codec->time_base.num, st->codec->time_base.den);
00109 
00110     return 0;
00111 }
00112 
00113 static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)
00114 {
00115     R3DContext *r3d = s->priv_data;
00116     AVStream *st = s->streams[0];
00117     int i;
00118 
00119     r3d->video_offsets_count = (atom->size - 8) / 4;
00120     r3d->video_offsets = av_malloc(atom->size);
00121     if (!r3d->video_offsets)
00122         return AVERROR(ENOMEM);
00123 
00124     for (i = 0; i < r3d->video_offsets_count; i++) {
00125         r3d->video_offsets[i] = avio_rb32(s->pb);
00126         if (!r3d->video_offsets[i]) {
00127             r3d->video_offsets_count = i;
00128             break;
00129         }
00130         av_dlog(s, "video offset %d: %#x\n", i, r3d->video_offsets[i]);
00131     }
00132 
00133     if (st->codec->time_base.den)
00134         st->duration = (uint64_t)r3d->video_offsets_count*
00135             st->time_base.den*st->codec->time_base.num/st->codec->time_base.den;
00136     av_dlog(s, "duration %"PRId64"\n", st->duration);
00137 
00138     return 0;
00139 }
00140 
00141 static void r3d_read_reos(AVFormatContext *s)
00142 {
00143     R3DContext *r3d = s->priv_data;
00144     int av_unused tmp;
00145 
00146     r3d->rdvo_offset = avio_rb32(s->pb);
00147     avio_rb32(s->pb); // rdvs offset
00148     avio_rb32(s->pb); // rdao offset
00149     avio_rb32(s->pb); // rdas offset
00150 
00151     tmp = avio_rb32(s->pb);
00152     av_dlog(s, "num video chunks %d\n", tmp);
00153 
00154     tmp = avio_rb32(s->pb);
00155     av_dlog(s, "num audio chunks %d\n", tmp);
00156 
00157     avio_skip(s->pb, 6*4);
00158 }
00159 
00160 static int r3d_read_header(AVFormatContext *s, AVFormatParameters *ap)
00161 {
00162     R3DContext *r3d = s->priv_data;
00163     Atom atom;
00164     int ret;
00165 
00166     if (read_atom(s, &atom) < 0) {
00167         av_log(s, AV_LOG_ERROR, "error reading atom\n");
00168         return -1;
00169     }
00170     if (atom.tag == MKTAG('R','E','D','1')) {
00171         if ((ret = r3d_read_red1(s)) < 0) {
00172             av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");
00173             return ret;
00174         }
00175     } else {
00176         av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");
00177         return -1;
00178     }
00179 
00180     s->data_offset = avio_tell(s->pb);
00181     av_dlog(s, "data offset %#"PRIx64"\n", s->data_offset);
00182     if (!s->pb->seekable)
00183         return 0;
00184     // find REOB/REOF/REOS to load index
00185     avio_seek(s->pb, avio_size(s->pb)-48-8, SEEK_SET);
00186     if (read_atom(s, &atom) < 0)
00187         av_log(s, AV_LOG_ERROR, "error reading end atom\n");
00188 
00189     if (atom.tag != MKTAG('R','E','O','B') &&
00190         atom.tag != MKTAG('R','E','O','F') &&
00191         atom.tag != MKTAG('R','E','O','S'))
00192         goto out;
00193 
00194     r3d_read_reos(s);
00195 
00196     if (r3d->rdvo_offset) {
00197         avio_seek(s->pb, r3d->rdvo_offset, SEEK_SET);
00198         if (read_atom(s, &atom) < 0)
00199             av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");
00200         if (atom.tag == MKTAG('R','D','V','O')) {
00201             if (r3d_read_rdvo(s, &atom) < 0)
00202                 av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");
00203         }
00204     }
00205 
00206  out:
00207     avio_seek(s->pb, s->data_offset, SEEK_SET);
00208     return 0;
00209 }
00210 
00211 static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)
00212 {
00213     AVStream *st = s->streams[0];
00214     int tmp;
00215     int av_unused tmp2;
00216     uint64_t pos = avio_tell(s->pb);
00217     unsigned dts;
00218     int ret;
00219 
00220     dts = avio_rb32(s->pb);
00221 
00222     tmp = avio_rb32(s->pb);
00223     av_dlog(s, "frame num %d\n", tmp);
00224 
00225     tmp  = avio_r8(s->pb); // major version
00226     tmp2 = avio_r8(s->pb); // minor version
00227     av_dlog(s, "version %d.%d\n", tmp, tmp2);
00228 
00229     tmp = avio_rb16(s->pb); // unknown
00230     av_dlog(s, "unknown %d\n", tmp);
00231 
00232     if (tmp > 4) {
00233         tmp = avio_rb16(s->pb); // unknown
00234         av_dlog(s, "unknown %d\n", tmp);
00235 
00236         tmp = avio_rb16(s->pb); // unknown
00237         av_dlog(s, "unknown %d\n", tmp);
00238 
00239         tmp = avio_rb32(s->pb);
00240         av_dlog(s, "width %d\n", tmp);
00241         tmp = avio_rb32(s->pb);
00242         av_dlog(s, "height %d\n", tmp);
00243 
00244         tmp = avio_rb32(s->pb);
00245         av_dlog(s, "metadata len %d\n", tmp);
00246     }
00247     tmp = atom->size - 8 - (avio_tell(s->pb) - pos);
00248     if (tmp < 0)
00249         return -1;
00250     ret = av_get_packet(s->pb, pkt, tmp);
00251     if (ret < 0) {
00252         av_log(s, AV_LOG_ERROR, "error reading video packet\n");
00253         return -1;
00254     }
00255 
00256     pkt->stream_index = 0;
00257     pkt->dts = dts;
00258     if (st->codec->time_base.den)
00259         pkt->duration = (uint64_t)st->time_base.den*
00260             st->codec->time_base.num/st->codec->time_base.den;
00261     av_dlog(s, "pkt dts %"PRId64" duration %d\n", pkt->dts, pkt->duration);
00262 
00263     return 0;
00264 }
00265 
00266 static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
00267 {
00268     AVStream *st = s->streams[1];
00269     int av_unused tmp, tmp2;
00270     int samples, size;
00271     uint64_t pos = avio_tell(s->pb);
00272     unsigned dts;
00273     int ret;
00274 
00275     dts = avio_rb32(s->pb);
00276 
00277     st->codec->sample_rate = avio_rb32(s->pb);
00278 
00279     samples = avio_rb32(s->pb);
00280 
00281     tmp = avio_rb32(s->pb);
00282     av_dlog(s, "packet num %d\n", tmp);
00283 
00284     tmp = avio_rb16(s->pb); // unkown
00285     av_dlog(s, "unknown %d\n", tmp);
00286 
00287     tmp  = avio_r8(s->pb); // major version
00288     tmp2 = avio_r8(s->pb); // minor version
00289     av_dlog(s, "version %d.%d\n", tmp, tmp2);
00290 
00291     tmp = avio_rb32(s->pb); // unknown
00292     av_dlog(s, "unknown %d\n", tmp);
00293 
00294     size = atom->size - 8 - (avio_tell(s->pb) - pos);
00295     if (size < 0)
00296         return -1;
00297     ret = av_get_packet(s->pb, pkt, size);
00298     if (ret < 0) {
00299         av_log(s, AV_LOG_ERROR, "error reading audio packet\n");
00300         return ret;
00301     }
00302 
00303     pkt->stream_index = 1;
00304     pkt->dts = dts;
00305     pkt->duration = av_rescale(samples, st->time_base.den, st->codec->sample_rate);
00306     av_dlog(s, "pkt dts %"PRId64" duration %d samples %d sample rate %d\n",
00307             pkt->dts, pkt->duration, samples, st->codec->sample_rate);
00308 
00309     return 0;
00310 }
00311 
00312 static int r3d_read_packet(AVFormatContext *s, AVPacket *pkt)
00313 {
00314     Atom atom;
00315     int err = 0;
00316 
00317     while (!err) {
00318         if (read_atom(s, &atom) < 0) {
00319             err = -1;
00320             break;
00321         }
00322         switch (atom.tag) {
00323         case MKTAG('R','E','D','V'):
00324             if (s->streams[0]->discard == AVDISCARD_ALL)
00325                 goto skip;
00326             if (!(err = r3d_read_redv(s, pkt, &atom)))
00327                 return 0;
00328             break;
00329         case MKTAG('R','E','D','A'):
00330             if (s->nb_streams < 2)
00331                 return -1;
00332             if (s->streams[1]->discard == AVDISCARD_ALL)
00333                 goto skip;
00334             if (!(err = r3d_read_reda(s, pkt, &atom)))
00335                 return 0;
00336             break;
00337         default:
00338         skip:
00339             avio_skip(s->pb, atom.size-8);
00340         }
00341     }
00342     return err;
00343 }
00344 
00345 static int r3d_probe(AVProbeData *p)
00346 {
00347     if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))
00348         return AVPROBE_SCORE_MAX;
00349     return 0;
00350 }
00351 
00352 static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
00353 {
00354     AVStream *st = s->streams[0]; // video stream
00355     R3DContext *r3d = s->priv_data;
00356     int frame_num;
00357 
00358     if (!st->codec->time_base.num || !st->time_base.den)
00359         return -1;
00360 
00361     frame_num = sample_time*st->codec->time_base.den/
00362         ((int64_t)st->codec->time_base.num*st->time_base.den);
00363     av_dlog(s, "seek frame num %d timestamp %"PRId64"\n",
00364             frame_num, sample_time);
00365 
00366     if (frame_num < r3d->video_offsets_count) {
00367         avio_seek(s->pb, r3d->video_offsets_count, SEEK_SET);
00368     } else {
00369         av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);
00370         return -1;
00371     }
00372 
00373     return 0;
00374 }
00375 
00376 static int r3d_close(AVFormatContext *s)
00377 {
00378     R3DContext *r3d = s->priv_data;
00379 
00380     av_freep(&r3d->video_offsets);
00381 
00382     return 0;
00383 }
00384 
00385 AVInputFormat ff_r3d_demuxer = {
00386     "r3d",
00387     NULL_IF_CONFIG_SMALL("REDCODE R3D format"),
00388     sizeof(R3DContext),
00389     r3d_probe,
00390     r3d_read_header,
00391     r3d_read_packet,
00392     r3d_close,
00393     r3d_seek,
00394 };