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     AVRational framerate;
00061 
00062     if (!st)
00063         return AVERROR(ENOMEM);
00064     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00065     st->codec->codec_id = AV_CODEC_ID_JPEG2000;
00066 
00067     tmp  = avio_r8(s->pb); // major version
00068     tmp2 = avio_r8(s->pb); // minor version
00069     av_dlog(s, "version %d.%d\n", tmp, tmp2);
00070 
00071     tmp = avio_rb16(s->pb); // unknown
00072     av_dlog(s, "unknown1 %d\n", tmp);
00073 
00074     tmp = avio_rb32(s->pb);
00075     avpriv_set_pts_info(st, 32, 1, tmp);
00076 
00077     tmp = avio_rb32(s->pb); // filenum
00078     av_dlog(s, "filenum %d\n", tmp);
00079 
00080     avio_skip(s->pb, 32); // unknown
00081 
00082     st->codec->width  = avio_rb32(s->pb);
00083     st->codec->height = avio_rb32(s->pb);
00084 
00085     tmp = avio_rb16(s->pb); // unknown
00086     av_dlog(s, "unknown2 %d\n", tmp);
00087 
00088     framerate.num = avio_rb16(s->pb);
00089     framerate.den = avio_rb16(s->pb);
00090     if (framerate.num && framerate.den) {
00091 #if FF_API_R_FRAME_RATE
00092         st->r_frame_rate =
00093 #endif
00094         st->avg_frame_rate = framerate;
00095     }
00096 
00097     tmp = avio_r8(s->pb); // audio channels
00098     av_dlog(s, "audio channels %d\n", tmp);
00099     if (tmp > 0) {
00100         AVStream *ast = avformat_new_stream(s, NULL);
00101         if (!ast)
00102             return AVERROR(ENOMEM);
00103         ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00104         ast->codec->codec_id = AV_CODEC_ID_PCM_S32BE;
00105         ast->codec->channels = tmp;
00106         avpriv_set_pts_info(ast, 32, 1, st->time_base.den);
00107     }
00108 
00109     avio_read(s->pb, filename, 257);
00110     filename[sizeof(filename)-1] = 0;
00111     av_dict_set(&st->metadata, "filename", filename, 0);
00112 
00113     av_dlog(s, "filename %s\n", filename);
00114     av_dlog(s, "resolution %dx%d\n", st->codec->width, st->codec->height);
00115     av_dlog(s, "timescale %d\n", st->time_base.den);
00116     av_dlog(s, "frame rate %d/%d\n",
00117             framerate.num, framerate.den);
00118 
00119     return 0;
00120 }
00121 
00122 static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)
00123 {
00124     R3DContext *r3d = s->priv_data;
00125     AVStream *st = s->streams[0];
00126     int i;
00127 
00128     r3d->video_offsets_count = (atom->size - 8) / 4;
00129     r3d->video_offsets = av_malloc(atom->size);
00130     if (!r3d->video_offsets)
00131         return AVERROR(ENOMEM);
00132 
00133     for (i = 0; i < r3d->video_offsets_count; i++) {
00134         r3d->video_offsets[i] = avio_rb32(s->pb);
00135         if (!r3d->video_offsets[i]) {
00136             r3d->video_offsets_count = i;
00137             break;
00138         }
00139         av_dlog(s, "video offset %d: %#x\n", i, r3d->video_offsets[i]);
00140     }
00141 
00142     if (st->avg_frame_rate.num)
00143         st->duration = av_rescale_q(r3d->video_offsets_count,
00144                                     av_inv_q(st->avg_frame_rate),
00145                                     st->time_base);
00146     av_dlog(s, "duration %"PRId64"\n", st->duration);
00147 
00148     return 0;
00149 }
00150 
00151 static void r3d_read_reos(AVFormatContext *s)
00152 {
00153     R3DContext *r3d = s->priv_data;
00154     int av_unused tmp;
00155 
00156     r3d->rdvo_offset = avio_rb32(s->pb);
00157     avio_rb32(s->pb); // rdvs offset
00158     avio_rb32(s->pb); // rdao offset
00159     avio_rb32(s->pb); // rdas offset
00160 
00161     tmp = avio_rb32(s->pb);
00162     av_dlog(s, "num video chunks %d\n", tmp);
00163 
00164     tmp = avio_rb32(s->pb);
00165     av_dlog(s, "num audio chunks %d\n", tmp);
00166 
00167     avio_skip(s->pb, 6*4);
00168 }
00169 
00170 static int r3d_read_header(AVFormatContext *s)
00171 {
00172     R3DContext *r3d = s->priv_data;
00173     Atom atom;
00174     int ret;
00175 
00176     if (read_atom(s, &atom) < 0) {
00177         av_log(s, AV_LOG_ERROR, "error reading atom\n");
00178         return -1;
00179     }
00180     if (atom.tag == MKTAG('R','E','D','1')) {
00181         if ((ret = r3d_read_red1(s)) < 0) {
00182             av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");
00183             return ret;
00184         }
00185     } else {
00186         av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");
00187         return -1;
00188     }
00189 
00190     s->data_offset = avio_tell(s->pb);
00191     av_dlog(s, "data offset %#"PRIx64"\n", s->data_offset);
00192     if (!s->pb->seekable)
00193         return 0;
00194     // find REOB/REOF/REOS to load index
00195     avio_seek(s->pb, avio_size(s->pb)-48-8, SEEK_SET);
00196     if (read_atom(s, &atom) < 0)
00197         av_log(s, AV_LOG_ERROR, "error reading end atom\n");
00198 
00199     if (atom.tag != MKTAG('R','E','O','B') &&
00200         atom.tag != MKTAG('R','E','O','F') &&
00201         atom.tag != MKTAG('R','E','O','S'))
00202         goto out;
00203 
00204     r3d_read_reos(s);
00205 
00206     if (r3d->rdvo_offset) {
00207         avio_seek(s->pb, r3d->rdvo_offset, SEEK_SET);
00208         if (read_atom(s, &atom) < 0)
00209             av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");
00210         if (atom.tag == MKTAG('R','D','V','O')) {
00211             if (r3d_read_rdvo(s, &atom) < 0)
00212                 av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");
00213         }
00214     }
00215 
00216  out:
00217     avio_seek(s->pb, s->data_offset, SEEK_SET);
00218     return 0;
00219 }
00220 
00221 static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)
00222 {
00223     AVStream *st = s->streams[0];
00224     int tmp;
00225     int av_unused tmp2;
00226     uint64_t pos = avio_tell(s->pb);
00227     unsigned dts;
00228     int ret;
00229 
00230     dts = avio_rb32(s->pb);
00231 
00232     tmp = avio_rb32(s->pb);
00233     av_dlog(s, "frame num %d\n", tmp);
00234 
00235     tmp  = avio_r8(s->pb); // major version
00236     tmp2 = avio_r8(s->pb); // minor version
00237     av_dlog(s, "version %d.%d\n", tmp, tmp2);
00238 
00239     tmp = avio_rb16(s->pb); // unknown
00240     av_dlog(s, "unknown %d\n", tmp);
00241 
00242     if (tmp > 4) {
00243         tmp = avio_rb16(s->pb); // unknown
00244         av_dlog(s, "unknown %d\n", tmp);
00245 
00246         tmp = avio_rb16(s->pb); // unknown
00247         av_dlog(s, "unknown %d\n", tmp);
00248 
00249         tmp = avio_rb32(s->pb);
00250         av_dlog(s, "width %d\n", tmp);
00251         tmp = avio_rb32(s->pb);
00252         av_dlog(s, "height %d\n", tmp);
00253 
00254         tmp = avio_rb32(s->pb);
00255         av_dlog(s, "metadata len %d\n", tmp);
00256     }
00257     tmp = atom->size - 8 - (avio_tell(s->pb) - pos);
00258     if (tmp < 0)
00259         return -1;
00260     ret = av_get_packet(s->pb, pkt, tmp);
00261     if (ret < 0) {
00262         av_log(s, AV_LOG_ERROR, "error reading video packet\n");
00263         return -1;
00264     }
00265 
00266     pkt->stream_index = 0;
00267     pkt->dts = dts;
00268     if (st->avg_frame_rate.num)
00269         pkt->duration = (uint64_t)st->time_base.den*
00270             st->avg_frame_rate.den/st->avg_frame_rate.num;
00271     av_dlog(s, "pkt dts %"PRId64" duration %d\n", pkt->dts, pkt->duration);
00272 
00273     return 0;
00274 }
00275 
00276 static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
00277 {
00278     AVStream *st = s->streams[1];
00279     int av_unused tmp, tmp2;
00280     int samples, size;
00281     uint64_t pos = avio_tell(s->pb);
00282     unsigned dts;
00283     int ret;
00284 
00285     dts = avio_rb32(s->pb);
00286 
00287     st->codec->sample_rate = avio_rb32(s->pb);
00288 
00289     samples = avio_rb32(s->pb);
00290 
00291     tmp = avio_rb32(s->pb);
00292     av_dlog(s, "packet num %d\n", tmp);
00293 
00294     tmp = avio_rb16(s->pb); // unknown
00295     av_dlog(s, "unknown %d\n", tmp);
00296 
00297     tmp  = avio_r8(s->pb); // major version
00298     tmp2 = avio_r8(s->pb); // minor version
00299     av_dlog(s, "version %d.%d\n", tmp, tmp2);
00300 
00301     tmp = avio_rb32(s->pb); // unknown
00302     av_dlog(s, "unknown %d\n", tmp);
00303 
00304     size = atom->size - 8 - (avio_tell(s->pb) - pos);
00305     if (size < 0)
00306         return -1;
00307     ret = av_get_packet(s->pb, pkt, size);
00308     if (ret < 0) {
00309         av_log(s, AV_LOG_ERROR, "error reading audio packet\n");
00310         return ret;
00311     }
00312 
00313     pkt->stream_index = 1;
00314     pkt->dts = dts;
00315     pkt->duration = av_rescale(samples, st->time_base.den, st->codec->sample_rate);
00316     av_dlog(s, "pkt dts %"PRId64" duration %d samples %d sample rate %d\n",
00317             pkt->dts, pkt->duration, samples, st->codec->sample_rate);
00318 
00319     return 0;
00320 }
00321 
00322 static int r3d_read_packet(AVFormatContext *s, AVPacket *pkt)
00323 {
00324     Atom atom;
00325     int err = 0;
00326 
00327     while (!err) {
00328         if (read_atom(s, &atom) < 0) {
00329             err = -1;
00330             break;
00331         }
00332         switch (atom.tag) {
00333         case MKTAG('R','E','D','V'):
00334             if (s->streams[0]->discard == AVDISCARD_ALL)
00335                 goto skip;
00336             if (!(err = r3d_read_redv(s, pkt, &atom)))
00337                 return 0;
00338             break;
00339         case MKTAG('R','E','D','A'):
00340             if (s->nb_streams < 2)
00341                 return -1;
00342             if (s->streams[1]->discard == AVDISCARD_ALL)
00343                 goto skip;
00344             if (!(err = r3d_read_reda(s, pkt, &atom)))
00345                 return 0;
00346             break;
00347         default:
00348         skip:
00349             avio_skip(s->pb, atom.size-8);
00350         }
00351     }
00352     return err;
00353 }
00354 
00355 static int r3d_probe(AVProbeData *p)
00356 {
00357     if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))
00358         return AVPROBE_SCORE_MAX;
00359     return 0;
00360 }
00361 
00362 static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
00363 {
00364     AVStream *st = s->streams[0]; // video stream
00365     R3DContext *r3d = s->priv_data;
00366     int frame_num;
00367 
00368     if (!st->avg_frame_rate.num)
00369         return -1;
00370 
00371     frame_num = av_rescale_q(sample_time, st->time_base,
00372                              av_inv_q(st->avg_frame_rate));
00373     av_dlog(s, "seek frame num %d timestamp %"PRId64"\n",
00374             frame_num, sample_time);
00375 
00376     if (frame_num < r3d->video_offsets_count) {
00377         if (avio_seek(s->pb, r3d->video_offsets_count, SEEK_SET) < 0)
00378             return -1;
00379     } else {
00380         av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);
00381         return -1;
00382     }
00383 
00384     return 0;
00385 }
00386 
00387 static int r3d_close(AVFormatContext *s)
00388 {
00389     R3DContext *r3d = s->priv_data;
00390 
00391     av_freep(&r3d->video_offsets);
00392 
00393     return 0;
00394 }
00395 
00396 AVInputFormat ff_r3d_demuxer = {
00397     .name           = "r3d",
00398     .long_name      = NULL_IF_CONFIG_SMALL("REDCODE R3D"),
00399     .priv_data_size = sizeof(R3DContext),
00400     .read_probe     = r3d_probe,
00401     .read_header    = r3d_read_header,
00402     .read_packet    = r3d_read_packet,
00403     .read_close     = r3d_close,
00404     .read_seek      = r3d_seek,
00405 };