libavformat/nuv.c

   1 /*
   2  * NuppelVideo demuxer.
   3  * Copyright (c) 2006 Reimar Doeffinger
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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/channel_layout.h"
  23 #include "libavutil/imgutils.h"
  24 #include "libavutil/intreadwrite.h"
  25 #include "libavutil/intfloat.h"
  26 #include "avformat.h"
  27 #include "internal.h"
  28 #include "riff.h"
  29
  30 static const AVCodecTag nuv_audio_tags[] = {
  31     { AV_CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
  32     { AV_CODEC_ID_MP3,       MKTAG('L', 'A', 'M', 'E') },
  33     { AV_CODEC_ID_NONE,      0 },
  34 };
  35
  36 typedef struct NUVContext {
  37     int v_id;
  38     int a_id;
  39     int rtjpg_video;
  40 } NUVContext;
  41
  42 typedef enum {
  43     NUV_VIDEO     = 'V',
  44     NUV_EXTRADATA = 'D',
  45     NUV_AUDIO     = 'A',
  46     NUV_SEEKP     = 'R',
  47     NUV_MYTHEXT   = 'X'
  48 } nuv_frametype;
  49
  50 static int nuv_probe(AVProbeData *p)
  51 {
  52     if (!memcmp(p->buf, "NuppelVideo", 12))
  53         return AVPROBE_SCORE_MAX;
  54     if (!memcmp(p->buf, "MythTVVideo", 12))
  55         return AVPROBE_SCORE_MAX;
  56     return 0;
  57 }
  58
  59 /// little macro to sanitize packet size
  60 #define PKTSIZE(s) (s &  0xffffff)
  61
  62 /**
  63  * @brief read until we found all data needed for decoding
  64  * @param vst video stream of which to change parameters
  65  * @param ast video stream of which to change parameters
  66  * @param myth set if this is a MythTVVideo format file
  67  * @return 0 or AVERROR code
  68  */
  69 static int get_codec_data(AVIOContext *pb, AVStream *vst,
  70                           AVStream *ast, int myth)
  71 {
  72     nuv_frametype frametype;
  73
  74     if (!vst && !myth)
  75         return 1; // no codec data needed
  76     while (!pb->eof_reached) {
  77         int size, subtype;
  78
  79         frametype = avio_r8(pb);
  80         switch (frametype) {
  81         case NUV_EXTRADATA:
  82             subtype = avio_r8(pb);
  83             avio_skip(pb, 6);
  84             size = PKTSIZE(avio_rl32(pb));
  85             if (vst && subtype == 'R') {
  86                 if (vst->codec->extradata) {
  87                     av_freep(&vst->codec->extradata);
  88                     vst->codec->extradata_size = 0;
  89                 }
  90                 vst->codec->extradata = av_malloc(size);
  91                 if (!vst->codec->extradata)
  92                     return AVERROR(ENOMEM);
  93                 vst->codec->extradata_size = size;
  94                 avio_read(pb, vst->codec->extradata, size);
  95                 size = 0;
  96                 if (!myth)
  97                     return 0;
  98             }
  99             break;
 100         case NUV_MYTHEXT:
 101             avio_skip(pb, 7);
 102             size = PKTSIZE(avio_rl32(pb));
 103             if (size != 128 * 4)
 104                 break;
 105             avio_rl32(pb); // version
 106             if (vst) {
 107                 vst->codec->codec_tag = avio_rl32(pb);
 108                 vst->codec->codec_id =
 109                     ff_codec_get_id(ff_codec_bmp_tags, vst->codec->codec_tag);
 110                 if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
 111                     vst->codec->codec_id = AV_CODEC_ID_NUV;
 112             } else
 113                 avio_skip(pb, 4);
 114
 115             if (ast) {
 116                 int id;
 117
 118                 ast->codec->codec_tag             = avio_rl32(pb);
 119                 ast->codec->sample_rate           = avio_rl32(pb);
 120                 ast->codec->bits_per_coded_sample = avio_rl32(pb);
 121                 ast->codec->channels              = avio_rl32(pb);
 122                 ast->codec->channel_layout        = 0;
 123
 124                 id = ff_wav_codec_get_id(ast->codec->codec_tag,
 125                                          ast->codec->bits_per_coded_sample);
 126                 if (id == AV_CODEC_ID_NONE) {
 127                     id = ff_codec_get_id(nuv_audio_tags, ast->codec->codec_tag);
 128                     if (id == AV_CODEC_ID_PCM_S16LE)
 129                         id = ff_get_pcm_codec_id(ast->codec->bits_per_coded_sample,
 130                                                  0, 0, ~1);
 131                 }
 132                 ast->codec->codec_id = id;
 133
 134                 ast->need_parsing = AVSTREAM_PARSE_FULL;
 135             } else
 136                 avio_skip(pb, 4 * 4);
 137
 138             size -= 6 * 4;
 139             avio_skip(pb, size);
 140             return 0;
 141         case NUV_SEEKP:
 142             size = 11;
 143             break;
 144         default:
 145             avio_skip(pb, 7);
 146             size = PKTSIZE(avio_rl32(pb));
 147             break;
 148         }
 149         avio_skip(pb, size);
 150     }
 151
 152     return 0;
 153 }
 154
 155 static int nuv_header(AVFormatContext *s)
 156 {
 157     NUVContext *ctx = s->priv_data;
 158     AVIOContext *pb = s->pb;
 159     char id_string[12];
 160     double aspect, fps;
 161     int is_mythtv, width, height, v_packs, a_packs, ret;
 162     AVStream *vst = NULL, *ast = NULL;
 163
 164     avio_read(pb, id_string, 12);
 165     is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
 166     avio_skip(pb, 5);       // version string
 167     avio_skip(pb, 3);       // padding
 168     width  = avio_rl32(pb);
 169     height = avio_rl32(pb);
 170     avio_rl32(pb);          // unused, "desiredwidth"
 171     avio_rl32(pb);          // unused, "desiredheight"
 172     avio_r8(pb);            // 'P' == progressive, 'I' == interlaced
 173     avio_skip(pb, 3);       // padding
 174     aspect = av_int2double(avio_rl64(pb));
 175     if (aspect > 0.9999 && aspect < 1.0001)
 176         aspect = 4.0 / 3.0;
 177     fps = av_int2double(avio_rl64(pb));
 178     if (fps < 0.0f) {
 179         if (s->error_recognition & AV_EF_EXPLODE) {
 180             av_log(s, AV_LOG_ERROR, "Invalid frame rate %f\n", fps);
 181             return AVERROR_INVALIDDATA;
 182         } else {
 183             av_log(s, AV_LOG_WARNING, "Invalid frame rate %f, setting to 0.\n", fps);
 184             fps = 0.0f;
 185         }
 186     }
 187
 188     // number of packets per stream type, -1 means unknown, e.g. streaming
 189     v_packs = avio_rl32(pb);
 190     a_packs = avio_rl32(pb);
 191     avio_rl32(pb); // text
 192
 193     avio_rl32(pb); // keyframe distance (?)
 194
 195     if (v_packs) {
 196         vst = avformat_new_stream(s, NULL);
 197         if (!vst)
 198             return AVERROR(ENOMEM);
 199         ctx->v_id = vst->index;
 200
 201         ret = av_image_check_size(width, height, 0, ctx);
 202         if (ret < 0)
 203             return ret;
 204
 205         vst->codec->codec_type            = AVMEDIA_TYPE_VIDEO;
 206         vst->codec->codec_id              = AV_CODEC_ID_NUV;
 207         vst->codec->width                 = width;
 208         vst->codec->height                = height;
 209         vst->codec->bits_per_coded_sample = 10;
 210         vst->sample_aspect_ratio          = av_d2q(aspect * height / width,
 211                                                    10000);
 212         vst->avg_frame_rate = av_d2q(fps, 60000);
 213         avpriv_set_pts_info(vst, 32, 1, 1000);
 214     } else
 215         ctx->v_id = -1;
 216
 217     if (a_packs) {
 218         ast = avformat_new_stream(s, NULL);
 219         if (!ast)
 220             return AVERROR(ENOMEM);
 221         ctx->a_id = ast->index;
 222
 223         ast->codec->codec_type            = AVMEDIA_TYPE_AUDIO;
 224         ast->codec->codec_id              = AV_CODEC_ID_PCM_S16LE;
 225         ast->codec->channels              = 2;
 226         ast->codec->channel_layout        = AV_CH_LAYOUT_STEREO;
 227         ast->codec->sample_rate           = 44100;
 228         ast->codec->bit_rate              = 2 * 2 * 44100 * 8;
 229         ast->codec->block_align           = 2 * 2;
 230         ast->codec->bits_per_coded_sample = 16;
 231         avpriv_set_pts_info(ast, 32, 1, 1000);
 232     } else
 233         ctx->a_id = -1;
 234
 235     if ((ret = get_codec_data(pb, vst, ast, is_mythtv)) < 0)
 236         return ret;
 237
 238     ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV;
 239
 240     return 0;
 241 }
 242
 243 #define HDRSIZE 12
 244
 245 static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
 246 {
 247     NUVContext *ctx = s->priv_data;
 248     AVIOContext *pb = s->pb;
 249     uint8_t hdr[HDRSIZE];
 250     nuv_frametype frametype;
 251     int ret, size;
 252
 253     while (!pb->eof_reached) {
 254         int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
 255         uint64_t pos    = avio_tell(pb);
 256
 257         ret = avio_read(pb, hdr, HDRSIZE);
 258         if (ret < HDRSIZE)
 259             return ret < 0 ? ret : AVERROR(EIO);
 260
 261         frametype = hdr[0];
 262         size      = PKTSIZE(AV_RL32(&hdr[8]));
 263
 264         switch (frametype) {
 265         case NUV_EXTRADATA:
 266             if (!ctx->rtjpg_video) {
 267                 avio_skip(pb, size);
 268                 break;
 269             }
 270         case NUV_VIDEO:
 271             if (ctx->v_id < 0) {
 272                 av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
 273                 avio_skip(pb, size);
 274                 break;
 275             }
 276             ret = av_new_packet(pkt, copyhdrsize + size);
 277             if (ret < 0)
 278                 return ret;
 279             // HACK: we have no idea if it is a keyframe,
 280             // but if we mark none seeking will not work at all.
 281             pkt->flags       |= AV_PKT_FLAG_KEY;
 282             pkt->pos          = pos;
 283             pkt->pts          = AV_RL32(&hdr[4]);
 284             pkt->stream_index = ctx->v_id;
 285             memcpy(pkt->data, hdr, copyhdrsize);
 286             ret = avio_read(pb, pkt->data + copyhdrsize, size);
 287             if (ret < 0) {
 288                 av_packet_unref(pkt);
 289                 return ret;
 290             }
 291             if (ret < size)
 292                 av_shrink_packet(pkt, copyhdrsize + ret);
 293             return 0;
 294         case NUV_AUDIO:
 295             if (ctx->a_id < 0) {
 296                 av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
 297                 avio_skip(pb, size);
 298                 break;
 299             }
 300             ret               = av_get_packet(pb, pkt, size);
 301             pkt->flags       |= AV_PKT_FLAG_KEY;
 302             pkt->pos          = pos;
 303             pkt->pts          = AV_RL32(&hdr[4]);
 304             pkt->stream_index = ctx->a_id;
 305             if (ret < 0)
 306                 return ret;
 307             return 0;
 308         case NUV_SEEKP:
 309             // contains no data, size value is invalid
 310             break;
 311         default:
 312             avio_skip(pb, size);
 313             break;
 314         }
 315     }
 316
 317     return AVERROR(EIO);
 318 }
 319
 320 AVInputFormat ff_nuv_demuxer = {
 321     .name           = "nuv",
 322     .long_name      = NULL_IF_CONFIG_SMALL("NuppelVideo"),
 323     .priv_data_size = sizeof(NUVContext),
 324     .read_probe     = nuv_probe,
 325     .read_header    = nuv_header,
 326     .read_packet    = nuv_packet,
 327     .flags          = AVFMT_GENERIC_INDEX,
 328 };