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  1. /*
  2.  * R3D REDCODE demuxer
  3.  * Copyright (c) 2008 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "libavutil/intreadwrite.h"
  23. #include "libavutil/dict.h"
  24. #include "libavutil/mathematics.h"
  25. #include "avformat.h"
  26. #include "internal.h"
  27.  
  28. typedef struct {
  29.     unsigned video_offsets_count;
  30.     unsigned *video_offsets;
  31.     unsigned rdvo_offset;
  32. } R3DContext;
  33.  
  34. typedef struct {
  35.     unsigned size;
  36.     uint32_t tag;
  37.     uint64_t offset;
  38. } Atom;
  39.  
  40. static int read_atom(AVFormatContext *s, Atom *atom)
  41. {
  42.     atom->offset = avio_tell(s->pb);
  43.     atom->size = avio_rb32(s->pb);
  44.     if (atom->size < 8)
  45.         return -1;
  46.     atom->tag = avio_rl32(s->pb);
  47.     av_dlog(s, "atom %u %.4s offset %#"PRIx64"\n",
  48.             atom->size, (char*)&atom->tag, atom->offset);
  49.     return atom->size;
  50. }
  51.  
  52. static int r3d_read_red1(AVFormatContext *s)
  53. {
  54.     AVStream *st = avformat_new_stream(s, NULL);
  55.     char filename[258];
  56.     int tmp;
  57.     int av_unused tmp2;
  58.     AVRational framerate;
  59.  
  60.     if (!st)
  61.         return AVERROR(ENOMEM);
  62.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  63.     st->codec->codec_id = AV_CODEC_ID_JPEG2000;
  64.  
  65.     tmp  = avio_r8(s->pb); // major version
  66.     tmp2 = avio_r8(s->pb); // minor version
  67.     av_dlog(s, "version %d.%d\n", tmp, tmp2);
  68.  
  69.     tmp = avio_rb16(s->pb); // unknown
  70.     av_dlog(s, "unknown1 %d\n", tmp);
  71.  
  72.     tmp = avio_rb32(s->pb);
  73.     avpriv_set_pts_info(st, 32, 1, tmp);
  74.  
  75.     tmp = avio_rb32(s->pb); // filenum
  76.     av_dlog(s, "filenum %d\n", tmp);
  77.  
  78.     avio_skip(s->pb, 32); // unknown
  79.  
  80.     st->codec->width  = avio_rb32(s->pb);
  81.     st->codec->height = avio_rb32(s->pb);
  82.  
  83.     tmp = avio_rb16(s->pb); // unknown
  84.     av_dlog(s, "unknown2 %d\n", tmp);
  85.  
  86.     framerate.num = avio_rb16(s->pb);
  87.     framerate.den = avio_rb16(s->pb);
  88.     if (framerate.num > 0 && framerate.den > 0) {
  89. #if FF_API_R_FRAME_RATE
  90.         st->r_frame_rate =
  91. #endif
  92.         st->avg_frame_rate = framerate;
  93.     }
  94.  
  95.     tmp = avio_r8(s->pb); // audio channels
  96.     av_dlog(s, "audio channels %d\n", tmp);
  97.     if (tmp > 0) {
  98.         AVStream *ast = avformat_new_stream(s, NULL);
  99.         if (!ast)
  100.             return AVERROR(ENOMEM);
  101.         ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  102.         ast->codec->codec_id = AV_CODEC_ID_PCM_S32BE;
  103.         ast->codec->channels = tmp;
  104.         avpriv_set_pts_info(ast, 32, 1, st->time_base.den);
  105.     }
  106.  
  107.     avio_read(s->pb, filename, 257);
  108.     filename[sizeof(filename)-1] = 0;
  109.     av_dict_set(&st->metadata, "filename", filename, 0);
  110.  
  111.     av_dlog(s, "filename %s\n", filename);
  112.     av_dlog(s, "resolution %dx%d\n", st->codec->width, st->codec->height);
  113.     av_dlog(s, "timescale %d\n", st->time_base.den);
  114.     av_dlog(s, "frame rate %d/%d\n",
  115.             framerate.num, framerate.den);
  116.  
  117.     return 0;
  118. }
  119.  
  120. static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)
  121. {
  122.     R3DContext *r3d = s->priv_data;
  123.     AVStream *st = s->streams[0];
  124.     int i;
  125.  
  126.     r3d->video_offsets_count = (atom->size - 8) / 4;
  127.     r3d->video_offsets = av_malloc(atom->size);
  128.     if (!r3d->video_offsets)
  129.         return AVERROR(ENOMEM);
  130.  
  131.     for (i = 0; i < r3d->video_offsets_count; i++) {
  132.         r3d->video_offsets[i] = avio_rb32(s->pb);
  133.         if (!r3d->video_offsets[i]) {
  134.             r3d->video_offsets_count = i;
  135.             break;
  136.         }
  137.         av_dlog(s, "video offset %d: %#x\n", i, r3d->video_offsets[i]);
  138.     }
  139.  
  140.     if (st->avg_frame_rate.num)
  141.         st->duration = av_rescale_q(r3d->video_offsets_count,
  142.                                     av_inv_q(st->avg_frame_rate),
  143.                                     st->time_base);
  144.     av_dlog(s, "duration %"PRId64"\n", st->duration);
  145.  
  146.     return 0;
  147. }
  148.  
  149. static void r3d_read_reos(AVFormatContext *s)
  150. {
  151.     R3DContext *r3d = s->priv_data;
  152.     int av_unused tmp;
  153.  
  154.     r3d->rdvo_offset = avio_rb32(s->pb);
  155.     avio_rb32(s->pb); // rdvs offset
  156.     avio_rb32(s->pb); // rdao offset
  157.     avio_rb32(s->pb); // rdas offset
  158.  
  159.     tmp = avio_rb32(s->pb);
  160.     av_dlog(s, "num video chunks %d\n", tmp);
  161.  
  162.     tmp = avio_rb32(s->pb);
  163.     av_dlog(s, "num audio chunks %d\n", tmp);
  164.  
  165.     avio_skip(s->pb, 6*4);
  166. }
  167.  
  168. static int r3d_read_header(AVFormatContext *s)
  169. {
  170.     R3DContext *r3d = s->priv_data;
  171.     Atom atom;
  172.     int ret;
  173.  
  174.     if (read_atom(s, &atom) < 0) {
  175.         av_log(s, AV_LOG_ERROR, "error reading atom\n");
  176.         return -1;
  177.     }
  178.     if (atom.tag == MKTAG('R','E','D','1')) {
  179.         if ((ret = r3d_read_red1(s)) < 0) {
  180.             av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");
  181.             return ret;
  182.         }
  183.     } else {
  184.         av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");
  185.         return -1;
  186.     }
  187.  
  188.     s->data_offset = avio_tell(s->pb);
  189.     av_dlog(s, "data offset %#"PRIx64"\n", s->data_offset);
  190.     if (!s->pb->seekable)
  191.         return 0;
  192.     // find REOB/REOF/REOS to load index
  193.     avio_seek(s->pb, avio_size(s->pb)-48-8, SEEK_SET);
  194.     if (read_atom(s, &atom) < 0)
  195.         av_log(s, AV_LOG_ERROR, "error reading end atom\n");
  196.  
  197.     if (atom.tag != MKTAG('R','E','O','B') &&
  198.         atom.tag != MKTAG('R','E','O','F') &&
  199.         atom.tag != MKTAG('R','E','O','S'))
  200.         goto out;
  201.  
  202.     r3d_read_reos(s);
  203.  
  204.     if (r3d->rdvo_offset) {
  205.         avio_seek(s->pb, r3d->rdvo_offset, SEEK_SET);
  206.         if (read_atom(s, &atom) < 0)
  207.             av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");
  208.         if (atom.tag == MKTAG('R','D','V','O')) {
  209.             if (r3d_read_rdvo(s, &atom) < 0)
  210.                 av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");
  211.         }
  212.     }
  213.  
  214.  out:
  215.     avio_seek(s->pb, s->data_offset, SEEK_SET);
  216.     return 0;
  217. }
  218.  
  219. static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)
  220. {
  221.     AVStream *st = s->streams[0];
  222.     int tmp;
  223.     int av_unused tmp2;
  224.     uint64_t pos = avio_tell(s->pb);
  225.     unsigned dts;
  226.     int ret;
  227.  
  228.     dts = avio_rb32(s->pb);
  229.  
  230.     tmp = avio_rb32(s->pb);
  231.     av_dlog(s, "frame num %d\n", tmp);
  232.  
  233.     tmp  = avio_r8(s->pb); // major version
  234.     tmp2 = avio_r8(s->pb); // minor version
  235.     av_dlog(s, "version %d.%d\n", tmp, tmp2);
  236.  
  237.     tmp = avio_rb16(s->pb); // unknown
  238.     av_dlog(s, "unknown %d\n", tmp);
  239.  
  240.     if (tmp > 4) {
  241.         tmp = avio_rb16(s->pb); // unknown
  242.         av_dlog(s, "unknown %d\n", tmp);
  243.  
  244.         tmp = avio_rb16(s->pb); // unknown
  245.         av_dlog(s, "unknown %d\n", tmp);
  246.  
  247.         tmp = avio_rb32(s->pb);
  248.         av_dlog(s, "width %d\n", tmp);
  249.         tmp = avio_rb32(s->pb);
  250.         av_dlog(s, "height %d\n", tmp);
  251.  
  252.         tmp = avio_rb32(s->pb);
  253.         av_dlog(s, "metadata len %d\n", tmp);
  254.     }
  255.     tmp = atom->size - 8 - (avio_tell(s->pb) - pos);
  256.     if (tmp < 0)
  257.         return -1;
  258.     ret = av_get_packet(s->pb, pkt, tmp);
  259.     if (ret < 0) {
  260.         av_log(s, AV_LOG_ERROR, "error reading video packet\n");
  261.         return -1;
  262.     }
  263.  
  264.     pkt->stream_index = 0;
  265.     pkt->dts = dts;
  266.     if (st->avg_frame_rate.num)
  267.         pkt->duration = (uint64_t)st->time_base.den*
  268.             st->avg_frame_rate.den/st->avg_frame_rate.num;
  269.     av_dlog(s, "pkt dts %"PRId64" duration %d\n", pkt->dts, pkt->duration);
  270.  
  271.     return 0;
  272. }
  273.  
  274. static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
  275. {
  276.     AVStream *st = s->streams[1];
  277.     int av_unused tmp, tmp2;
  278.     int samples, size;
  279.     uint64_t pos = avio_tell(s->pb);
  280.     unsigned dts;
  281.     int ret;
  282.  
  283.     dts = avio_rb32(s->pb);
  284.  
  285.     st->codec->sample_rate = avio_rb32(s->pb);
  286.     if (st->codec->sample_rate <= 0) {
  287.         av_log(s, AV_LOG_ERROR, "Bad sample rate\n");
  288.         return AVERROR_INVALIDDATA;
  289.     }
  290.  
  291.     samples = avio_rb32(s->pb);
  292.  
  293.     tmp = avio_rb32(s->pb);
  294.     av_dlog(s, "packet num %d\n", tmp);
  295.  
  296.     tmp = avio_rb16(s->pb); // unknown
  297.     av_dlog(s, "unknown %d\n", tmp);
  298.  
  299.     tmp  = avio_r8(s->pb); // major version
  300.     tmp2 = avio_r8(s->pb); // minor version
  301.     av_dlog(s, "version %d.%d\n", tmp, tmp2);
  302.  
  303.     tmp = avio_rb32(s->pb); // unknown
  304.     av_dlog(s, "unknown %d\n", tmp);
  305.  
  306.     size = atom->size - 8 - (avio_tell(s->pb) - pos);
  307.     if (size < 0)
  308.         return -1;
  309.     ret = av_get_packet(s->pb, pkt, size);
  310.     if (ret < 0) {
  311.         av_log(s, AV_LOG_ERROR, "error reading audio packet\n");
  312.         return ret;
  313.     }
  314.  
  315.     pkt->stream_index = 1;
  316.     pkt->dts = dts;
  317.     if (st->codec->sample_rate)
  318.         pkt->duration = av_rescale(samples, st->time_base.den, st->codec->sample_rate);
  319.     av_dlog(s, "pkt dts %"PRId64" duration %d samples %d sample rate %d\n",
  320.             pkt->dts, pkt->duration, samples, st->codec->sample_rate);
  321.  
  322.     return 0;
  323. }
  324.  
  325. static int r3d_read_packet(AVFormatContext *s, AVPacket *pkt)
  326. {
  327.     Atom atom;
  328.     int err = 0;
  329.  
  330.     while (!err) {
  331.         if (read_atom(s, &atom) < 0) {
  332.             err = -1;
  333.             break;
  334.         }
  335.         switch (atom.tag) {
  336.         case MKTAG('R','E','D','V'):
  337.             if (s->streams[0]->discard == AVDISCARD_ALL)
  338.                 goto skip;
  339.             if (!(err = r3d_read_redv(s, pkt, &atom)))
  340.                 return 0;
  341.             break;
  342.         case MKTAG('R','E','D','A'):
  343.             if (s->nb_streams < 2)
  344.                 return -1;
  345.             if (s->streams[1]->discard == AVDISCARD_ALL)
  346.                 goto skip;
  347.             if (!(err = r3d_read_reda(s, pkt, &atom)))
  348.                 return 0;
  349.             break;
  350.         default:
  351.         skip:
  352.             avio_skip(s->pb, atom.size-8);
  353.         }
  354.     }
  355.     return err;
  356. }
  357.  
  358. static int r3d_probe(AVProbeData *p)
  359. {
  360.     if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))
  361.         return AVPROBE_SCORE_MAX;
  362.     return 0;
  363. }
  364.  
  365. static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
  366. {
  367.     AVStream *st = s->streams[0]; // video stream
  368.     R3DContext *r3d = s->priv_data;
  369.     int frame_num;
  370.  
  371.     if (!st->avg_frame_rate.num)
  372.         return -1;
  373.  
  374.     frame_num = av_rescale_q(sample_time, st->time_base,
  375.                              av_inv_q(st->avg_frame_rate));
  376.     av_dlog(s, "seek frame num %d timestamp %"PRId64"\n",
  377.             frame_num, sample_time);
  378.  
  379.     if (frame_num < r3d->video_offsets_count) {
  380.         if (avio_seek(s->pb, r3d->video_offsets_count, SEEK_SET) < 0)
  381.             return -1;
  382.     } else {
  383.         av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);
  384.         return -1;
  385.     }
  386.  
  387.     return 0;
  388. }
  389.  
  390. static int r3d_close(AVFormatContext *s)
  391. {
  392.     R3DContext *r3d = s->priv_data;
  393.  
  394.     av_freep(&r3d->video_offsets);
  395.  
  396.     return 0;
  397. }
  398.  
  399. AVInputFormat ff_r3d_demuxer = {
  400.     .name           = "r3d",
  401.     .long_name      = NULL_IF_CONFIG_SMALL("REDCODE R3D"),
  402.     .priv_data_size = sizeof(R3DContext),
  403.     .read_probe     = r3d_probe,
  404.     .read_header    = r3d_read_header,
  405.     .read_packet    = r3d_read_packet,
  406.     .read_close     = r3d_close,
  407.     .read_seek      = r3d_seek,
  408. };
  409.