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
  22 #include "libavutil/intreadwrite.h"
  23 #include "avformat.h"
  24 #include "riff.h"
  25
  26 typedef struct {
  27     int v_id;
  28     int a_id;
  29     int rtjpg_video;
  30 } NUVContext;
  31
  32 typedef enum {
  33     NUV_VIDEO = 'V',
  34     NUV_EXTRADATA = 'D',
  35     NUV_AUDIO = 'A',
  36     NUV_SEEKP = 'R',
  37     NUV_MYTHEXT = 'X'
  38 } nuv_frametype;
  39
  40 static int nuv_probe(AVProbeData *p) {
  41     if (!memcmp(p->buf, "NuppelVideo", 12))
  42         return AVPROBE_SCORE_MAX;
  43     if (!memcmp(p->buf, "MythTVVideo", 12))
  44         return AVPROBE_SCORE_MAX;
  45     return 0;
  46 }
  47
  48 //! little macro to sanitize packet size
  49 #define PKTSIZE(s) (s &  0xffffff)
  50
  51 /**
  52  * \brief read until we found all data needed for decoding
  53  * \param vst video stream of which to change parameters
  54  * \param ast video stream of which to change parameters
  55  * \param myth set if this is a MythTVVideo format file
  56  * \return 1 if all required codec data was found
  57  */
  58 static int get_codec_data(ByteIOContext *pb, AVStream *vst,
  59                           AVStream *ast, int myth) {
  60     nuv_frametype frametype;
  61     if (!vst && !myth)
  62         return 1; // no codec data needed
  63     while (!url_feof(pb)) {
  64         int size, subtype;
  65         frametype = get_byte(pb);
  66         switch (frametype) {
  67             case NUV_EXTRADATA:
  68                 subtype = get_byte(pb);
  69                 url_fskip(pb, 6);
  70                 size = PKTSIZE(get_le32(pb));
  71                 if (vst && subtype == 'R') {
  72                     vst->codec->extradata_size = size;
  73                     vst->codec->extradata = av_malloc(size);
  74                     get_buffer(pb, vst->codec->extradata, size);
  75                     size = 0;
  76                     if (!myth)
  77                         return 1;
  78                 }
  79                 break;
  80             case NUV_MYTHEXT:
  81                 url_fskip(pb, 7);
  82                 size = PKTSIZE(get_le32(pb));
  83                 if (size != 128 * 4)
  84                     break;
  85                 get_le32(pb); // version
  86                 if (vst) {
  87                     vst->codec->codec_tag = get_le32(pb);
  88                     vst->codec->codec_id =
  89                         codec_get_id(codec_bmp_tags, vst->codec->codec_tag);
  90                     if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
  91                         vst->codec->codec_id = CODEC_ID_NUV;
  92                 } else
  93                     url_fskip(pb, 4);
  94
  95                 if (ast) {
  96                     ast->codec->codec_tag = get_le32(pb);
  97                     ast->codec->sample_rate = get_le32(pb);
  98                     ast->codec->bits_per_coded_sample = get_le32(pb);
  99                     ast->codec->channels = get_le32(pb);
 100                     ast->codec->codec_id =
 101                         wav_codec_get_id(ast->codec->codec_tag,
 102                                          ast->codec->bits_per_coded_sample);
 103                     ast->need_parsing = AVSTREAM_PARSE_FULL;
 104                 } else
 105                     url_fskip(pb, 4 * 4);
 106
 107                 size -= 6 * 4;
 108                 url_fskip(pb, size);
 109                 return 1;
 110             case NUV_SEEKP:
 111                 size = 11;
 112                 break;
 113             default:
 114                 url_fskip(pb, 7);
 115                 size = PKTSIZE(get_le32(pb));
 116                 break;
 117         }
 118         url_fskip(pb, size);
 119     }
 120     return 0;
 121 }
 122
 123 static int nuv_header(AVFormatContext *s, AVFormatParameters *ap) {
 124     NUVContext *ctx = s->priv_data;
 125     ByteIOContext *pb = s->pb;
 126     char id_string[12];
 127     double aspect, fps;
 128     int is_mythtv, width, height, v_packs, a_packs;
 129     int stream_nr = 0;
 130     AVStream *vst = NULL, *ast = NULL;
 131     get_buffer(pb, id_string, 12);
 132     is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
 133     url_fskip(pb, 5); // version string
 134     url_fskip(pb, 3); // padding
 135     width = get_le32(pb);
 136     height = get_le32(pb);
 137     get_le32(pb); // unused, "desiredwidth"
 138     get_le32(pb); // unused, "desiredheight"
 139     get_byte(pb); // 'P' == progressive, 'I' == interlaced
 140     url_fskip(pb, 3); // padding
 141     aspect = av_int2dbl(get_le64(pb));
 142     if (aspect > 0.9999 && aspect < 1.0001)
 143         aspect = 4.0 / 3.0;
 144     fps = av_int2dbl(get_le64(pb));
 145
 146     // number of packets per stream type, -1 means unknown, e.g. streaming
 147     v_packs = get_le32(pb);
 148     a_packs = get_le32(pb);
 149     get_le32(pb); // text
 150
 151     get_le32(pb); // keyframe distance (?)
 152
 153     if (v_packs) {
 154         ctx->v_id = stream_nr++;
 155         vst = av_new_stream(s, ctx->v_id);
 156         if (!vst)
 157             return AVERROR(ENOMEM);
 158         vst->codec->codec_type = CODEC_TYPE_VIDEO;
 159         vst->codec->codec_id = CODEC_ID_NUV;
 160         vst->codec->width = width;
 161         vst->codec->height = height;
 162         vst->codec->bits_per_coded_sample = 10;
 163         vst->sample_aspect_ratio = av_d2q(aspect * height / width, 10000);
 164         vst->r_frame_rate = av_d2q(fps, 60000);
 165         av_set_pts_info(vst, 32, 1, 1000);
 166     } else
 167         ctx->v_id = -1;
 168
 169     if (a_packs) {
 170         ctx->a_id = stream_nr++;
 171         ast = av_new_stream(s, ctx->a_id);
 172         if (!ast)
 173             return AVERROR(ENOMEM);
 174         ast->codec->codec_type = CODEC_TYPE_AUDIO;
 175         ast->codec->codec_id = CODEC_ID_PCM_S16LE;
 176         ast->codec->channels = 2;
 177         ast->codec->sample_rate = 44100;
 178         ast->codec->bit_rate = 2 * 2 * 44100 * 8;
 179         ast->codec->block_align = 2 * 2;
 180         ast->codec->bits_per_coded_sample = 16;
 181         av_set_pts_info(ast, 32, 1, 1000);
 182     } else
 183         ctx->a_id = -1;
 184
 185     get_codec_data(pb, vst, ast, is_mythtv);
 186     ctx->rtjpg_video = vst && vst->codec->codec_id == CODEC_ID_NUV;
 187     return 0;
 188 }
 189
 190 #define HDRSIZE 12
 191
 192 static int nuv_packet(AVFormatContext *s, AVPacket *pkt) {
 193     NUVContext *ctx = s->priv_data;
 194     ByteIOContext *pb = s->pb;
 195     uint8_t hdr[HDRSIZE];
 196     nuv_frametype frametype;
 197     int ret, size;
 198     while (!url_feof(pb)) {
 199         int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
 200         uint64_t pos = url_ftell(pb);
 201         ret = get_buffer(pb, hdr, HDRSIZE);
 202         if (ret < HDRSIZE)
 203             return ret < 0 ? ret : AVERROR(EIO);
 204         frametype = hdr[0];
 205         size = PKTSIZE(AV_RL32(&hdr[8]));
 206         switch (frametype) {
 207             case NUV_EXTRADATA:
 208                 if (!ctx->rtjpg_video) {
 209                     url_fskip(pb, size);
 210                     break;
 211                 }
 212             case NUV_VIDEO:
 213                 if (ctx->v_id < 0) {
 214                     av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
 215                     url_fskip(pb, size);
 216                     break;
 217                 }
 218                 ret = av_new_packet(pkt, copyhdrsize + size);
 219                 if (ret < 0)
 220                     return ret;
 221                 // HACK: we have no idea if it is a keyframe,
 222                 // but if we mark none seeking will not work at all.
 223                 pkt->flags |= PKT_FLAG_KEY;
 224                 pkt->pos = pos;
 225                 pkt->pts = AV_RL32(&hdr[4]);
 226                 pkt->stream_index = ctx->v_id;
 227                 memcpy(pkt->data, hdr, copyhdrsize);
 228                 ret = get_buffer(pb, pkt->data + copyhdrsize, size);
 229                 if (ret < 0) {
 230                     av_free_packet(pkt);
 231                     return ret;
 232                 }
 233                 if (ret < size)
 234                     av_shrink_packet(pkt, copyhdrsize + ret);
 235                 return 0;
 236             case NUV_AUDIO:
 237                 if (ctx->a_id < 0) {
 238                     av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
 239                     url_fskip(pb, size);
 240                     break;
 241                 }
 242                 ret = av_get_packet(pb, pkt, size);
 243                 pkt->flags |= PKT_FLAG_KEY;
 244                 pkt->pos = pos;
 245                 pkt->pts = AV_RL32(&hdr[4]);
 246                 pkt->stream_index = ctx->a_id;
 247                 if (ret < 0) return ret;
 248                 return 0;
 249             case NUV_SEEKP:
 250                 // contains no data, size value is invalid
 251                 break;
 252             default:
 253                 url_fskip(pb, size);
 254                 break;
 255         }
 256     }
 257     return AVERROR(EIO);
 258 }
 259
 260 AVInputFormat nuv_demuxer = {
 261     "nuv",
 262     NULL_IF_CONFIG_SMALL("NuppelVideo format"),
 263     sizeof(NUVContext),
 264     nuv_probe,
 265     nuv_header,
 266     nuv_packet,
 267     NULL,
 268     NULL,
 269     .flags = AVFMT_GENERIC_INDEX,
 270 };