libavformat/nuv.c

   1 /*
   2  * NuppelVideo demuxer.
   3  * Copyright (c) 2006 Reimar Doeffinger.
   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 #include "avformat.h"
  22 #include "riff.h"
  23
  24 typedef struct {
  25     int v_id;
  26     int a_id;
  27     int rtjpg_video;
  28 } NUVContext;
  29
  30 typedef enum {
  31     NUV_VIDEO = 'V',
  32     NUV_EXTRADATA = 'D',
  33     NUV_AUDIO = 'A',
  34     NUV_SEEKP = 'R',
  35     NUV_MYTHEXT = 'X'
  36 } frametype_t;
  37
  38 static int nuv_probe(AVProbeData *p) {
  39     if (!memcmp(p->buf, "NuppelVideo", 12))
  40         return AVPROBE_SCORE_MAX;
  41     if (!memcmp(p->buf, "MythTVVideo", 12))
  42         return AVPROBE_SCORE_MAX;
  43     return 0;
  44 }
  45
  46 //! little macro to sanitize packet size
  47 #define PKTSIZE(s) (s &  0xffffff)
  48
  49 /**
  50  * \brief read until we found all data needed for decoding
  51  * \param vst video stream of which to change parameters
  52  * \param ast video stream of which to change parameters
  53  * \param myth set if this is a MythTVVideo format file
  54  * \return 1 if all required codec data was found
  55  */
  56 static int get_codec_data(ByteIOContext *pb, AVStream *vst,
  57                           AVStream *ast, int myth) {
  58     frametype_t frametype;
  59     if (!vst && !myth)
  60         return 1; // no codec data needed
  61     while (!url_feof(pb)) {
  62         int size, subtype;
  63         frametype = get_byte(pb);
  64         switch (frametype) {
  65             case NUV_EXTRADATA:
  66                 subtype = get_byte(pb);
  67                 url_fskip(pb, 6);
  68                 size = PKTSIZE(get_le32(pb));
  69                 if (vst && subtype == 'R') {
  70                     vst->codec->extradata_size = size;
  71                     vst->codec->extradata = av_malloc(size);
  72                     get_buffer(pb, vst->codec->extradata, size);
  73                     size = 0;
  74                     if (!myth)
  75                         return 1;
  76                 }
  77                 break;
  78             case NUV_MYTHEXT:
  79                 url_fskip(pb, 7);
  80                 size = PKTSIZE(get_le32(pb));
  81                 if (size != 128 * 4)
  82                     break;
  83                 get_le32(pb); // version
  84                 if (vst) {
  85                     vst->codec->codec_tag = get_le32(pb);
  86                     vst->codec->codec_id =
  87                         codec_get_id(codec_bmp_tags, vst->codec->codec_tag);
  88                     if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
  89                         vst->codec->codec_id = CODEC_ID_NUV;
  90                 } else
  91                     url_fskip(pb, 4);
  92
  93                 if (ast) {
  94                     ast->codec->codec_tag = get_le32(pb);
  95                     ast->codec->sample_rate = get_le32(pb);
  96                     ast->codec->bits_per_coded_sample = get_le32(pb);
  97                     ast->codec->channels = get_le32(pb);
  98                     ast->codec->codec_id =
  99                         wav_codec_get_id(ast->codec->codec_tag,
 100                                          ast->codec->bits_per_coded_sample);
 101                     ast->need_parsing = AVSTREAM_PARSE_FULL;
 102                 } else
 103                     url_fskip(pb, 4 * 4);
 104
 105                 size -= 6 * 4;
 106                 url_fskip(pb, size);
 107                 return 1;
 108             case NUV_SEEKP:
 109                 size = 11;
 110                 break;
 111             default:
 112                 url_fskip(pb, 7);
 113                 size = PKTSIZE(get_le32(pb));
 114                 break;
 115         }
 116         url_fskip(pb, size);
 117     }
 118     return 0;
 119 }
 120
 121 static int nuv_header(AVFormatContext *s, AVFormatParameters *ap) {
 122     NUVContext *ctx = s->priv_data;
 123     ByteIOContext *pb = s->pb;
 124     char id_string[12], version_string[5];
 125     double aspect, fps;
 126     int is_mythtv, width, height, v_packs, a_packs;
 127     int stream_nr = 0;
 128     AVStream *vst = NULL, *ast = NULL;
 129     get_buffer(pb, id_string, 12);
 130     is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
 131     get_buffer(pb, version_string, 5);
 132     url_fskip(pb, 3); // padding
 133     width = get_le32(pb);
 134     height = get_le32(pb);
 135     get_le32(pb); // unused, "desiredwidth"
 136     get_le32(pb); // unused, "desiredheight"
 137     get_byte(pb); // 'P' == progressive, 'I' == interlaced
 138     url_fskip(pb, 3); // padding
 139     aspect = av_int2dbl(get_le64(pb));
 140     if (aspect > 0.9999 && aspect < 1.0001)
 141         aspect = 4.0 / 3.0;
 142     fps = av_int2dbl(get_le64(pb));
 143
 144     // number of packets per stream type, -1 means unknown, e.g. streaming
 145     v_packs = get_le32(pb);
 146     a_packs = get_le32(pb);
 147     get_le32(pb); // text
 148
 149     get_le32(pb); // keyframe distance (?)
 150
 151     if (v_packs) {
 152         ctx->v_id = stream_nr++;
 153         vst = av_new_stream(s, ctx->v_id);
 154         if (!vst)
 155             return AVERROR(ENOMEM);
 156         vst->codec->codec_type = CODEC_TYPE_VIDEO;
 157         vst->codec->codec_id = CODEC_ID_NUV;
 158         vst->codec->width = width;
 159         vst->codec->height = height;
 160         vst->codec->bits_per_coded_sample = 10;
 161         vst->sample_aspect_ratio = av_d2q(aspect * height / width, 10000);
 162         vst->r_frame_rate = av_d2q(fps, 60000);
 163         av_set_pts_info(vst, 32, 1, 1000);
 164     } else
 165         ctx->v_id = -1;
 166
 167     if (a_packs) {
 168         ctx->a_id = stream_nr++;
 169         ast = av_new_stream(s, ctx->a_id);
 170         if (!ast)
 171             return AVERROR(ENOMEM);
 172         ast->codec->codec_type = CODEC_TYPE_AUDIO;
 173         ast->codec->codec_id = CODEC_ID_PCM_S16LE;
 174         ast->codec->channels = 2;
 175         ast->codec->sample_rate = 44100;
 176         ast->codec->bit_rate = 2 * 2 * 44100 * 8;
 177         ast->codec->block_align = 2 * 2;
 178         ast->codec->bits_per_coded_sample = 16;
 179         av_set_pts_info(ast, 32, 1, 1000);
 180     } else
 181         ctx->a_id = -1;
 182
 183     get_codec_data(pb, vst, ast, is_mythtv);
 184     ctx->rtjpg_video = vst && vst->codec->codec_id == CODEC_ID_NUV;
 185     return 0;
 186 }
 187
 188 #define HDRSIZE 12
 189
 190 static int nuv_packet(AVFormatContext *s, AVPacket *pkt) {
 191     NUVContext *ctx = s->priv_data;
 192     ByteIOContext *pb = s->pb;
 193     uint8_t hdr[HDRSIZE];
 194     frametype_t frametype;
 195     int ret, size;
 196     while (!url_feof(pb)) {
 197         int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
 198         ret = get_buffer(pb, hdr, HDRSIZE);
 199         if (ret <= 0)
 200             return ret ? ret : -1;
 201         frametype = hdr[0];
 202         size = PKTSIZE(AV_RL32(&hdr[8]));
 203         switch (frametype) {
 204             case NUV_EXTRADATA:
 205                 if (!ctx->rtjpg_video) {
 206                     url_fskip(pb, size);
 207                     break;
 208                 }
 209             case NUV_VIDEO:
 210                 if (ctx->v_id < 0) {
 211                     av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
 212                     url_fskip(pb, size);
 213                     break;
 214                 }
 215                 ret = av_new_packet(pkt, copyhdrsize + size);
 216                 if (ret < 0)
 217                     return ret;
 218                 pkt->pos = url_ftell(pb) - copyhdrsize;
 219                 pkt->pts = AV_RL32(&hdr[4]);
 220                 pkt->stream_index = ctx->v_id;
 221                 memcpy(pkt->data, hdr, copyhdrsize);
 222                 ret = get_buffer(pb, pkt->data + copyhdrsize, size);
 223                 return ret;
 224             case NUV_AUDIO:
 225                 if (ctx->a_id < 0) {
 226                     av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
 227                     url_fskip(pb, size);
 228                     break;
 229                 }
 230                 ret = av_get_packet(pb, pkt, size);
 231                 pkt->pts = AV_RL32(&hdr[4]);
 232                 pkt->stream_index = ctx->a_id;
 233                 return ret;
 234             case NUV_SEEKP:
 235                 // contains no data, size value is invalid
 236                 break;
 237             default:
 238                 url_fskip(pb, size);
 239                 break;
 240         }
 241     }
 242     return AVERROR(EIO);
 243 }
 244
 245 AVInputFormat nuv_demuxer = {
 246     "nuv",
 247     NULL_IF_CONFIG_SMALL("NuppelVideo format"),
 248     sizeof(NUVContext),
 249     nuv_probe,
 250     nuv_header,
 251     nuv_packet,
 252     NULL,
 253     NULL,
 254 };