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 "avformat.h"
00026 
00027 typedef struct {
00028     unsigned video_offsets_count;
00029     unsigned *video_offsets;
00030     unsigned rdvo_offset;
00031 } R3DContext;
00032 
00033 typedef struct {
00034     unsigned size;
00035     uint32_t tag;
00036     uint64_t offset;
00037 } Atom;
00038 
00039 static int read_atom(AVFormatContext *s, Atom *atom)
00040 {
00041     atom->offset = url_ftell(s->pb);
00042     atom->size = get_be32(s->pb);
00043     if (atom->size < 8)
00044         return -1;
00045     atom->tag = get_le32(s->pb);
00046     dprintf(s, "atom %d %.4s offset %#llx\n",
00047             atom->size, (char*)&atom->tag, atom->offset);
00048     return atom->size;
00049 }
00050 
00051 static int r3d_read_red1(AVFormatContext *s)
00052 {
00053     AVStream *st = av_new_stream(s, 0);
00054     char filename[258];
00055     int tmp, tmp2;
00056 
00057     if (!st)
00058         return AVERROR(ENOMEM);
00059     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00060     st->codec->codec_id = CODEC_ID_JPEG2000;
00061 
00062     tmp  = get_byte(s->pb); // major version
00063     tmp2 = get_byte(s->pb); // minor version
00064     dprintf(s, "version %d.%d\n", tmp, tmp2);
00065 
00066     tmp = get_be16(s->pb); // unknown
00067     dprintf(s, "unknown1 %d\n", tmp);
00068 
00069     tmp = get_be32(s->pb);
00070     av_set_pts_info(st, 32, 1, tmp);
00071 
00072     tmp = get_be32(s->pb); // filenum
00073     dprintf(s, "filenum %d\n", tmp);
00074 
00075     url_fskip(s->pb, 32); // unknown
00076 
00077     st->codec->width  = get_be32(s->pb);
00078     st->codec->height = get_be32(s->pb);
00079 
00080     tmp = get_be16(s->pb); // unknown
00081     dprintf(s, "unknown2 %d\n", tmp);
00082 
00083     st->codec->time_base.den = get_be16(s->pb);
00084     st->codec->time_base.num = get_be16(s->pb);
00085 
00086     tmp = get_byte(s->pb); // audio channels
00087     dprintf(s, "audio channels %d\n", tmp);
00088     if (tmp > 0) {
00089         AVStream *ast = av_new_stream(s, 1);
00090         if (!ast)
00091             return AVERROR(ENOMEM);
00092         ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00093         ast->codec->codec_id = CODEC_ID_PCM_S32BE;
00094         ast->codec->channels = tmp;
00095         av_set_pts_info(ast, 32, 1, st->time_base.den);
00096     }
00097 
00098     get_buffer(s->pb, filename, 257);
00099     filename[sizeof(filename)-1] = 0;
00100     av_metadata_set2(&st->metadata, "filename", filename, 0);
00101 
00102     dprintf(s, "filename %s\n", filename);
00103     dprintf(s, "resolution %dx%d\n", st->codec->width, st->codec->height);
00104     dprintf(s, "timescale %d\n", st->time_base.den);
00105     dprintf(s, "frame rate %d/%d\n",
00106             st->codec->time_base.num, st->codec->time_base.den);
00107 
00108     return 0;
00109 }
00110 
00111 static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)
00112 {
00113     R3DContext *r3d = s->priv_data;
00114     AVStream *st = s->streams[0];
00115     int i;
00116 
00117     r3d->video_offsets_count = (atom->size - 8) / 4;
00118     r3d->video_offsets = av_malloc(atom->size);
00119     if (!r3d->video_offsets)
00120         return AVERROR(ENOMEM);
00121 
00122     for (i = 0; i < r3d->video_offsets_count; i++) {
00123         r3d->video_offsets[i] = get_be32(s->pb);
00124         if (!r3d->video_offsets[i]) {
00125             r3d->video_offsets_count = i;
00126             break;
00127         }
00128         dprintf(s, "video offset %d: %#x\n", i, r3d->video_offsets[i]);
00129     }
00130 
00131     if (st->codec->time_base.den)
00132         st->duration = (uint64_t)r3d->video_offsets_count*
00133             st->time_base.den*st->codec->time_base.num/st->codec->time_base.den;
00134     dprintf(s, "duration %lld\n", st->duration);
00135 
00136     return 0;
00137 }
00138 
00139 static void r3d_read_reos(AVFormatContext *s)
00140 {
00141     R3DContext *r3d = s->priv_data;
00142     int tmp;
00143 
00144     r3d->rdvo_offset = get_be32(s->pb);
00145     get_be32(s->pb); // rdvs offset
00146     get_be32(s->pb); // rdao offset
00147     get_be32(s->pb); // rdas offset
00148 
00149     tmp = get_be32(s->pb);
00150     dprintf(s, "num video chunks %d\n", tmp);
00151 
00152     tmp = get_be32(s->pb);
00153     dprintf(s, "num audio chunks %d\n", tmp);
00154 
00155     url_fskip(s->pb, 6*4);
00156 }
00157 
00158 static int r3d_read_header(AVFormatContext *s, AVFormatParameters *ap)
00159 {
00160     R3DContext *r3d = s->priv_data;
00161     Atom atom;
00162     int ret;
00163 
00164     if (read_atom(s, &atom) < 0) {
00165         av_log(s, AV_LOG_ERROR, "error reading atom\n");
00166         return -1;
00167     }
00168     if (atom.tag == MKTAG('R','E','D','1')) {
00169         if ((ret = r3d_read_red1(s)) < 0) {
00170             av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");
00171             return ret;
00172         }
00173     } else {
00174         av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");
00175         return -1;
00176     }
00177 
00178     s->data_offset = url_ftell(s->pb);
00179     dprintf(s, "data offset %#llx\n", s->data_offset);
00180     if (url_is_streamed(s->pb))
00181         return 0;
00182     // find REOB/REOF/REOS to load index
00183     url_fseek(s->pb, url_fsize(s->pb)-48-8, SEEK_SET);
00184     if (read_atom(s, &atom) < 0)
00185         av_log(s, AV_LOG_ERROR, "error reading end atom\n");
00186 
00187     if (atom.tag != MKTAG('R','E','O','B') &&
00188         atom.tag != MKTAG('R','E','O','F') &&
00189         atom.tag != MKTAG('R','E','O','S'))
00190         goto out;
00191 
00192     r3d_read_reos(s);
00193 
00194     if (r3d->rdvo_offset) {
00195         url_fseek(s->pb, r3d->rdvo_offset, SEEK_SET);
00196         if (read_atom(s, &atom) < 0)
00197             av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");
00198         if (atom.tag == MKTAG('R','D','V','O')) {
00199             if (r3d_read_rdvo(s, &atom) < 0)
00200                 av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");
00201         }
00202     }
00203 
00204  out:
00205     url_fseek(s->pb, s->data_offset, SEEK_SET);
00206     return 0;
00207 }
00208 
00209 static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)
00210 {
00211     AVStream *st = s->streams[0];
00212     int tmp, tmp2;
00213     uint64_t pos = url_ftell(s->pb);
00214     unsigned dts;
00215     int ret;
00216 
00217     dts = get_be32(s->pb);
00218 
00219     tmp = get_be32(s->pb);
00220     dprintf(s, "frame num %d\n", tmp);
00221 
00222     tmp  = get_byte(s->pb); // major version
00223     tmp2 = get_byte(s->pb); // minor version
00224     dprintf(s, "version %d.%d\n", tmp, tmp2);
00225 
00226     tmp = get_be16(s->pb); // unknown
00227     dprintf(s, "unknown %d\n", tmp);
00228 
00229     if (tmp > 4) {
00230         tmp = get_be16(s->pb); // unknown
00231         dprintf(s, "unknown %d\n", tmp);
00232 
00233         tmp = get_be16(s->pb); // unknown
00234         dprintf(s, "unknown %d\n", tmp);
00235 
00236         tmp = get_be32(s->pb);
00237         dprintf(s, "width %d\n", tmp);
00238         tmp = get_be32(s->pb);
00239         dprintf(s, "height %d\n", tmp);
00240 
00241         tmp = get_be32(s->pb);
00242         dprintf(s, "metadata len %d\n", tmp);
00243     }
00244     tmp = atom->size - 8 - (url_ftell(s->pb) - pos);
00245     if (tmp < 0)
00246         return -1;
00247     ret = av_get_packet(s->pb, pkt, tmp);
00248     if (ret < 0) {
00249         av_log(s, AV_LOG_ERROR, "error reading video packet\n");
00250         return -1;
00251     }
00252 
00253     pkt->stream_index = 0;
00254     pkt->dts = dts;
00255     if (st->codec->time_base.den)
00256         pkt->duration = (uint64_t)st->time_base.den*
00257             st->codec->time_base.num/st->codec->time_base.den;
00258     dprintf(s, "pkt dts %lld duration %d\n", pkt->dts, pkt->duration);
00259 
00260     return 0;
00261 }
00262 
00263 static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
00264 {
00265     AVStream *st = s->streams[1];
00266     int tmp, tmp2, samples, size;
00267     uint64_t pos = url_ftell(s->pb);
00268     unsigned dts;
00269     int ret;
00270 
00271     dts = get_be32(s->pb);
00272 
00273     st->codec->sample_rate = get_be32(s->pb);
00274 
00275     samples = get_be32(s->pb);
00276 
00277     tmp = get_be32(s->pb);
00278     dprintf(s, "packet num %d\n", tmp);
00279 
00280     tmp = get_be16(s->pb); // unkown
00281     dprintf(s, "unknown %d\n", tmp);
00282 
00283     tmp  = get_byte(s->pb); // major version
00284     tmp2 = get_byte(s->pb); // minor version
00285     dprintf(s, "version %d.%d\n", tmp, tmp2);
00286 
00287     tmp = get_be32(s->pb); // unknown
00288     dprintf(s, "unknown %d\n", tmp);
00289 
00290     size = atom->size - 8 - (url_ftell(s->pb) - pos);
00291     if (size < 0)
00292         return -1;
00293     ret = av_get_packet(s->pb, pkt, size);
00294     if (ret < 0) {
00295         av_log(s, AV_LOG_ERROR, "error reading audio packet\n");
00296         return ret;
00297     }
00298 
00299     pkt->stream_index = 1;
00300     pkt->dts = dts;
00301     pkt->duration = av_rescale(samples, st->time_base.den, st->codec->sample_rate);
00302     dprintf(s, "pkt dts %lld duration %d samples %d sample rate %d\n",
00303             pkt->dts, pkt->duration, samples, st->codec->sample_rate);
00304 
00305     return 0;
00306 }
00307 
00308 static int r3d_read_packet(AVFormatContext *s, AVPacket *pkt)
00309 {
00310     Atom atom;
00311     int err = 0;
00312 
00313     while (!err) {
00314         if (read_atom(s, &atom) < 0) {
00315             err = -1;
00316             break;
00317         }
00318         switch (atom.tag) {
00319         case MKTAG('R','E','D','V'):
00320             if (s->streams[0]->discard == AVDISCARD_ALL)
00321                 goto skip;
00322             if (!(err = r3d_read_redv(s, pkt, &atom)))
00323                 return 0;
00324             break;
00325         case MKTAG('R','E','D','A'):
00326             if (s->nb_streams < 2)
00327                 return -1;
00328             if (s->streams[1]->discard == AVDISCARD_ALL)
00329                 goto skip;
00330             if (!(err = r3d_read_reda(s, pkt, &atom)))
00331                 return 0;
00332             break;
00333         default:
00334         skip:
00335             url_fskip(s->pb, atom.size-8);
00336         }
00337     }
00338     return err;
00339 }
00340 
00341 static int r3d_probe(AVProbeData *p)
00342 {
00343     if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))
00344         return AVPROBE_SCORE_MAX;
00345     return 0;
00346 }
00347 
00348 static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
00349 {
00350     AVStream *st = s->streams[0]; // video stream
00351     R3DContext *r3d = s->priv_data;
00352     int frame_num;
00353 
00354     if (!st->codec->time_base.num || !st->time_base.den)
00355         return -1;
00356 
00357     frame_num = sample_time*st->codec->time_base.den/
00358         ((int64_t)st->codec->time_base.num*st->time_base.den);
00359     dprintf(s, "seek frame num %d timestamp %lld\n", frame_num, sample_time);
00360 
00361     if (frame_num < r3d->video_offsets_count) {
00362         url_fseek(s->pb, r3d->video_offsets_count, SEEK_SET);
00363     } else {
00364         av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);
00365         return -1;
00366     }
00367 
00368     return 0;
00369 }
00370 
00371 static int r3d_close(AVFormatContext *s)
00372 {
00373     R3DContext *r3d = s->priv_data;
00374 
00375     av_freep(&r3d->video_offsets);
00376 
00377     return 0;
00378 }
00379 
00380 AVInputFormat r3d_demuxer = {
00381     "r3d",
00382     NULL_IF_CONFIG_SMALL("REDCODE R3D format"),
00383     sizeof(R3DContext),
00384     r3d_probe,
00385     r3d_read_header,
00386     r3d_read_packet,
00387     r3d_close,
00388     r3d_seek,
00389 };