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 "libavutil/mathematics.h"
00027 #include "avformat.h"
00028 #include "internal.h"
00029 
00030 typedef struct {
00031     unsigned video_offsets_count;
00032     unsigned *video_offsets;
00033     unsigned rdvo_offset;
00034 } R3DContext;
00035 
00036 typedef struct {
00037     unsigned size;
00038     uint32_t tag;
00039     uint64_t offset;
00040 } Atom;
00041 
00042 static int read_atom(AVFormatContext *s, Atom *atom)
00043 {
00044     atom->offset = avio_tell(s->pb);
00045     atom->size = avio_rb32(s->pb);
00046     if (atom->size < 8)
00047         return -1;
00048     atom->tag = avio_rl32(s->pb);
00049     av_dlog(s, "atom %u %.4s offset %#"PRIx64"\n",
00050             atom->size, (char*)&atom->tag, atom->offset);
00051     return atom->size;
00052 }
00053 
00054 static int r3d_read_red1(AVFormatContext *s)
00055 {
00056     AVStream *st = avformat_new_stream(s, NULL);
00057     char filename[258];
00058     int tmp;
00059     int av_unused tmp2;
00060 
00061     if (!st)
00062         return AVERROR(ENOMEM);
00063     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00064     st->codec->codec_id = CODEC_ID_JPEG2000;
00065 
00066     tmp  = avio_r8(s->pb); // major version
00067     tmp2 = avio_r8(s->pb); // minor version
00068     av_dlog(s, "version %d.%d\n", tmp, tmp2);
00069 
00070     tmp = avio_rb16(s->pb); // unknown
00071     av_dlog(s, "unknown1 %d\n", tmp);
00072 
00073     tmp = avio_rb32(s->pb);
00074     avpriv_set_pts_info(st, 32, 1, tmp);
00075 
00076     tmp = avio_rb32(s->pb); // filenum
00077     av_dlog(s, "filenum %d\n", tmp);
00078 
00079     avio_skip(s->pb, 32); // unknown
00080 
00081     st->codec->width  = avio_rb32(s->pb);
00082     st->codec->height = avio_rb32(s->pb);
00083 
00084     tmp = avio_rb16(s->pb); // unknown
00085     av_dlog(s, "unknown2 %d\n", tmp);
00086 
00087     st->codec->time_base.den = avio_rb16(s->pb);
00088     st->codec->time_base.num = avio_rb16(s->pb);
00089 
00090     tmp = avio_r8(s->pb); // audio channels
00091     av_dlog(s, "audio channels %d\n", tmp);
00092     if (tmp > 0) {
00093         AVStream *ast = avformat_new_stream(s, NULL);
00094         if (!ast)
00095             return AVERROR(ENOMEM);
00096         ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00097         ast->codec->codec_id = CODEC_ID_PCM_S32BE;
00098         ast->codec->channels = tmp;
00099         avpriv_set_pts_info(ast, 32, 1, st->time_base.den);
00100     }
00101 
00102     avio_read(s->pb, filename, 257);
00103     filename[sizeof(filename)-1] = 0;
00104     av_dict_set(&st->metadata, "filename", filename, 0);
00105 
00106     av_dlog(s, "filename %s\n", filename);
00107     av_dlog(s, "resolution %dx%d\n", st->codec->width, st->codec->height);
00108     av_dlog(s, "timescale %d\n", st->time_base.den);
00109     av_dlog(s, "frame rate %d/%d\n",
00110             st->codec->time_base.num, st->codec->time_base.den);
00111 
00112     return 0;
00113 }
00114 
00115 static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)
00116 {
00117     R3DContext *r3d = s->priv_data;
00118     AVStream *st = s->streams[0];
00119     int i;
00120 
00121     r3d->video_offsets_count = (atom->size - 8) / 4;
00122     r3d->video_offsets = av_malloc(atom->size);
00123     if (!r3d->video_offsets)
00124         return AVERROR(ENOMEM);
00125 
00126     for (i = 0; i < r3d->video_offsets_count; i++) {
00127         r3d->video_offsets[i] = avio_rb32(s->pb);
00128         if (!r3d->video_offsets[i]) {
00129             r3d->video_offsets_count = i;
00130             break;
00131         }
00132         av_dlog(s, "video offset %d: %#x\n", i, r3d->video_offsets[i]);
00133     }
00134 
00135     if (st->codec->time_base.den)
00136         st->duration = (uint64_t)r3d->video_offsets_count*
00137             st->time_base.den*st->codec->time_base.num/st->codec->time_base.den;
00138     av_dlog(s, "duration %"PRId64"\n", st->duration);
00139 
00140     return 0;
00141 }
00142 
00143 static void r3d_read_reos(AVFormatContext *s)
00144 {
00145     R3DContext *r3d = s->priv_data;
00146     int av_unused tmp;
00147 
00148     r3d->rdvo_offset = avio_rb32(s->pb);
00149     avio_rb32(s->pb); // rdvs offset
00150     avio_rb32(s->pb); // rdao offset
00151     avio_rb32(s->pb); // rdas offset
00152 
00153     tmp = avio_rb32(s->pb);
00154     av_dlog(s, "num video chunks %d\n", tmp);
00155 
00156     tmp = avio_rb32(s->pb);
00157     av_dlog(s, "num audio chunks %d\n", tmp);
00158 
00159     avio_skip(s->pb, 6*4);
00160 }
00161 
00162 static int r3d_read_header(AVFormatContext *s, AVFormatParameters *ap)
00163 {
00164     R3DContext *r3d = s->priv_data;
00165     Atom atom;
00166     int ret;
00167 
00168     if (read_atom(s, &atom) < 0) {
00169         av_log(s, AV_LOG_ERROR, "error reading atom\n");
00170         return -1;
00171     }
00172     if (atom.tag == MKTAG('R','E','D','1')) {
00173         if ((ret = r3d_read_red1(s)) < 0) {
00174             av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");
00175             return ret;
00176         }
00177     } else {
00178         av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");
00179         return -1;
00180     }
00181 
00182     s->data_offset = avio_tell(s->pb);
00183     av_dlog(s, "data offset %#"PRIx64"\n", s->data_offset);
00184     if (!s->pb->seekable)
00185         return 0;
00186     // find REOB/REOF/REOS to load index
00187     avio_seek(s->pb, avio_size(s->pb)-48-8, SEEK_SET);
00188     if (read_atom(s, &atom) < 0)
00189         av_log(s, AV_LOG_ERROR, "error reading end atom\n");
00190 
00191     if (atom.tag != MKTAG('R','E','O','B') &&
00192         atom.tag != MKTAG('R','E','O','F') &&
00193         atom.tag != MKTAG('R','E','O','S'))
00194         goto out;
00195 
00196     r3d_read_reos(s);
00197 
00198     if (r3d->rdvo_offset) {
00199         avio_seek(s->pb, r3d->rdvo_offset, SEEK_SET);
00200         if (read_atom(s, &atom) < 0)
00201             av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");
00202         if (atom.tag == MKTAG('R','D','V','O')) {
00203             if (r3d_read_rdvo(s, &atom) < 0)
00204                 av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");
00205         }
00206     }
00207 
00208  out:
00209     avio_seek(s->pb, s->data_offset, SEEK_SET);
00210     return 0;
00211 }
00212 
00213 static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)
00214 {
00215     AVStream *st = s->streams[0];
00216     int tmp;
00217     int av_unused tmp2;
00218     uint64_t pos = avio_tell(s->pb);
00219     unsigned dts;
00220     int ret;
00221 
00222     dts = avio_rb32(s->pb);
00223 
00224     tmp = avio_rb32(s->pb);
00225     av_dlog(s, "frame num %d\n", tmp);
00226 
00227     tmp  = avio_r8(s->pb); // major version
00228     tmp2 = avio_r8(s->pb); // minor version
00229     av_dlog(s, "version %d.%d\n", tmp, tmp2);
00230 
00231     tmp = avio_rb16(s->pb); // unknown
00232     av_dlog(s, "unknown %d\n", tmp);
00233 
00234     if (tmp > 4) {
00235         tmp = avio_rb16(s->pb); // unknown
00236         av_dlog(s, "unknown %d\n", tmp);
00237 
00238         tmp = avio_rb16(s->pb); // unknown
00239         av_dlog(s, "unknown %d\n", tmp);
00240 
00241         tmp = avio_rb32(s->pb);
00242         av_dlog(s, "width %d\n", tmp);
00243         tmp = avio_rb32(s->pb);
00244         av_dlog(s, "height %d\n", tmp);
00245 
00246         tmp = avio_rb32(s->pb);
00247         av_dlog(s, "metadata len %d\n", tmp);
00248     }
00249     tmp = atom->size - 8 - (avio_tell(s->pb) - pos);
00250     if (tmp < 0)
00251         return -1;
00252     ret = av_get_packet(s->pb, pkt, tmp);
00253     if (ret < 0) {
00254         av_log(s, AV_LOG_ERROR, "error reading video packet\n");
00255         return -1;
00256     }
00257 
00258     pkt->stream_index = 0;
00259     pkt->dts = dts;
00260     if (st->codec->time_base.den)
00261         pkt->duration = (uint64_t)st->time_base.den*
00262             st->codec->time_base.num/st->codec->time_base.den;
00263     av_dlog(s, "pkt dts %"PRId64" duration %d\n", pkt->dts, pkt->duration);
00264 
00265     return 0;
00266 }
00267 
00268 static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
00269 {
00270     AVStream *st = s->streams[1];
00271     int av_unused tmp, tmp2;
00272     int samples, size;
00273     uint64_t pos = avio_tell(s->pb);
00274     unsigned dts;
00275     int ret;
00276 
00277     dts = avio_rb32(s->pb);
00278 
00279     st->codec->sample_rate = avio_rb32(s->pb);
00280 
00281     samples = avio_rb32(s->pb);
00282 
00283     tmp = avio_rb32(s->pb);
00284     av_dlog(s, "packet num %d\n", tmp);
00285 
00286     tmp = avio_rb16(s->pb); // unkown
00287     av_dlog(s, "unknown %d\n", tmp);
00288 
00289     tmp  = avio_r8(s->pb); // major version
00290     tmp2 = avio_r8(s->pb); // minor version
00291     av_dlog(s, "version %d.%d\n", tmp, tmp2);
00292 
00293     tmp = avio_rb32(s->pb); // unknown
00294     av_dlog(s, "unknown %d\n", tmp);
00295 
00296     size = atom->size - 8 - (avio_tell(s->pb) - pos);
00297     if (size < 0)
00298         return -1;
00299     ret = av_get_packet(s->pb, pkt, size);
00300     if (ret < 0) {
00301         av_log(s, AV_LOG_ERROR, "error reading audio packet\n");
00302         return ret;
00303     }
00304 
00305     pkt->stream_index = 1;
00306     pkt->dts = dts;
00307     pkt->duration = av_rescale(samples, st->time_base.den, st->codec->sample_rate);
00308     av_dlog(s, "pkt dts %"PRId64" duration %d samples %d sample rate %d\n",
00309             pkt->dts, pkt->duration, samples, st->codec->sample_rate);
00310 
00311     return 0;
00312 }
00313 
00314 static int r3d_read_packet(AVFormatContext *s, AVPacket *pkt)
00315 {
00316     Atom atom;
00317     int err = 0;
00318 
00319     while (!err) {
00320         if (read_atom(s, &atom) < 0) {
00321             err = -1;
00322             break;
00323         }
00324         switch (atom.tag) {
00325         case MKTAG('R','E','D','V'):
00326             if (s->streams[0]->discard == AVDISCARD_ALL)
00327                 goto skip;
00328             if (!(err = r3d_read_redv(s, pkt, &atom)))
00329                 return 0;
00330             break;
00331         case MKTAG('R','E','D','A'):
00332             if (s->nb_streams < 2)
00333                 return -1;
00334             if (s->streams[1]->discard == AVDISCARD_ALL)
00335                 goto skip;
00336             if (!(err = r3d_read_reda(s, pkt, &atom)))
00337                 return 0;
00338             break;
00339         default:
00340         skip:
00341             avio_skip(s->pb, atom.size-8);
00342         }
00343     }
00344     return err;
00345 }
00346 
00347 static int r3d_probe(AVProbeData *p)
00348 {
00349     if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))
00350         return AVPROBE_SCORE_MAX;
00351     return 0;
00352 }
00353 
00354 static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
00355 {
00356     AVStream *st = s->streams[0]; // video stream
00357     R3DContext *r3d = s->priv_data;
00358     int frame_num;
00359 
00360     if (!st->codec->time_base.num || !st->time_base.den)
00361         return -1;
00362 
00363     frame_num = sample_time*st->codec->time_base.den/
00364         ((int64_t)st->codec->time_base.num*st->time_base.den);
00365     av_dlog(s, "seek frame num %d timestamp %"PRId64"\n",
00366             frame_num, sample_time);
00367 
00368     if (frame_num < r3d->video_offsets_count) {
00369         if (avio_seek(s->pb, r3d->video_offsets_count, SEEK_SET) < 0)
00370             return -1;
00371     } else {
00372         av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);
00373         return -1;
00374     }
00375 
00376     return 0;
00377 }
00378 
00379 static int r3d_close(AVFormatContext *s)
00380 {
00381     R3DContext *r3d = s->priv_data;
00382 
00383     av_freep(&r3d->video_offsets);
00384 
00385     return 0;
00386 }
00387 
00388 AVInputFormat ff_r3d_demuxer = {
00389     .name           = "r3d",
00390     .long_name      = NULL_IF_CONFIG_SMALL("REDCODE R3D format"),
00391     .priv_data_size = sizeof(R3DContext),
00392     .read_probe     = r3d_probe,
00393     .read_header    = r3d_read_header,
00394     .read_packet    = r3d_read_packet,
00395     .read_close     = r3d_close,
00396     .read_seek      = r3d_seek,
00397 };