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