libavformat/nuv.c

   1 /*
   2  * NuppelVideo demuxer.
   3  * Copyright (c) 2006 Reimar Doeffinger.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19 #include "avformat.h"
  20 #include "avi.h"
  21
  22 typedef struct {
  23     int v_id;
  24     int a_id;
  25 } NUVContext;
  26
  27 typedef enum {
  28     NUV_VIDEO = 'V',
  29     NUV_EXTRADATA = 'D',
  30     NUV_AUDIO = 'A',
  31     NUV_SEEKP = 'R',
  32     NUV_MYTHEXT = 'X'
  33 } frametype_t;
  34
  35 static int nuv_probe(AVProbeData *p) {
  36     if (p->buf_size < 12)
  37         return 0;
  38     if (!memcmp(p->buf, "NuppelVideo", 12))
  39         return AVPROBE_SCORE_MAX;
  40     if (!memcmp(p->buf, "MythTVVideo", 12))
  41         return AVPROBE_SCORE_MAX;
  42     return 0;
  43 }
  44
  45 //! little macro to sanitize packet size
  46 #define PKTSIZE(s) (s &  0xffffff)
  47
  48 /**
  49  * \brief read until we found all data needed for decoding
  50  * \param vst video stream of which to change parameters
  51  * \param ast video stream of which to change parameters
  52  * \param myth set if this is a MythTVVideo format file
  53  * \return 1 if all required codec data was found
  54  */
  55 static int get_codec_data(ByteIOContext *pb, AVStream *vst,
  56                           AVStream *ast, int myth) {
  57     frametype_t frametype;
  58     if (!vst && !myth)
  59         return 1; // no codec data needed
  60     while (!url_feof(pb)) {
  61         int size, subtype;
  62         frametype = get_byte(pb);
  63         switch (frametype) {
  64             case NUV_EXTRADATA:
  65                 subtype = get_byte(pb);
  66                 url_fskip(pb, 6);
  67                 size = PKTSIZE(get_le32(pb));
  68                 if (subtype == 'R') {
  69                     vst->codec->extradata_size = size;
  70                     vst->codec->extradata = av_malloc(size);
  71                     get_buffer(pb, vst->codec->extradata, size);
  72                     size = 0;
  73                     if (!myth)
  74                         return 1;
  75                 }
  76                 break;
  77             case NUV_MYTHEXT:
  78                 url_fskip(pb, 7);
  79                 size = PKTSIZE(get_le32(pb));
  80                 if (size != 128 * 4)
  81                     break;
  82                 get_le32(pb); // version
  83                 if (vst) {
  84                     vst->codec->codec_tag = get_le32(pb);
  85                     vst->codec->codec_id =
  86                         codec_get_id(codec_bmp_tags, vst->codec->codec_tag);
  87                 } else
  88                     url_fskip(pb, 4);
  89
  90                 if (ast) {
  91                     ast->codec->codec_tag = get_le32(pb);
  92                     ast->codec->sample_rate = get_le32(pb);
  93                     ast->codec->bits_per_sample = get_le32(pb);
  94                     ast->codec->channels = get_le32(pb);
  95                     ast->codec->codec_id =
  96                         wav_codec_get_id(ast->codec->codec_tag,
  97                                          ast->codec->bits_per_sample);
  98                 } else
  99                     url_fskip(pb, 4 * 4);
 100
 101                 size -= 6 * 4;
 102                 url_fskip(pb, size);
 103                 return 1;
 104             case NUV_SEEKP:
 105                 size = 11;
 106                 break;
 107             default:
 108                 url_fskip(pb, 7);
 109                 size = PKTSIZE(get_le32(pb));
 110                 break;
 111         }
 112         url_fskip(pb, size);
 113     }
 114     return 0;
 115 }
 116
 117 static int nuv_header(AVFormatContext *s, AVFormatParameters *ap) {
 118     NUVContext *ctx = (NUVContext *)s->priv_data;
 119     ByteIOContext *pb = &s->pb;
 120     char id_string[12], version_string[5];
 121     double aspect, fps;
 122     int is_mythtv, width, height, v_packs, a_packs;
 123     int stream_nr = 0;
 124     AVStream *vst = NULL, *ast = NULL;
 125     get_buffer(pb, id_string, 12);
 126     is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
 127     get_buffer(pb, version_string, 5);
 128     url_fskip(pb, 3); // padding
 129     width = get_le32(pb);
 130     height = get_le32(pb);
 131     get_le32(pb); // unused, "desiredwidth"
 132     get_le32(pb); // unused, "desiredheight"
 133     get_byte(pb); // 'P' == progressive, 'I' == interlaced
 134     url_fskip(pb, 3); // padding
 135     aspect = av_int2dbl(get_le64(pb));
 136     fps = av_int2dbl(get_le64(pb));
 137
 138     // number of packets per stream type, -1 means unknown, e.g. streaming
 139     v_packs = get_le32(pb);
 140     a_packs = get_le32(pb);
 141     get_le32(pb); // text
 142
 143     get_le32(pb); // keyframe distance (?)
 144
 145     if (v_packs) {
 146         ctx->v_id = stream_nr++;
 147         vst = av_new_stream(s, ctx->v_id);
 148         vst->codec->codec_type = CODEC_TYPE_VIDEO;
 149         vst->codec->codec_id = CODEC_ID_NUV;
 150         vst->codec->codec_tag = MKTAG('R', 'J', 'P', 'G');
 151         vst->codec->width = width;
 152         vst->codec->height = height;
 153         vst->codec->bits_per_sample = 10;
 154         vst->codec->sample_aspect_ratio = av_d2q(aspect, 10000);
 155         vst->r_frame_rate = av_d2q(1.0 / fps, 10000);
 156         av_set_pts_info(vst, 32, 1, 1000);
 157     } else
 158         ctx->v_id = -1;
 159
 160     if (a_packs) {
 161         ctx->a_id = stream_nr++;
 162         ast = av_new_stream(s, ctx->a_id);
 163         ast->codec->codec_type = CODEC_TYPE_AUDIO;
 164         ast->codec->codec_id = CODEC_ID_PCM_S16LE;
 165         ast->codec->channels = 2;
 166         ast->codec->sample_rate = 44100;
 167         ast->codec->bit_rate = 2 * 2 * 44100 * 8;
 168         ast->codec->block_align = 2 * 2;
 169         ast->codec->bits_per_sample = 16;
 170         av_set_pts_info(ast, 32, 1, 1000);
 171     } else
 172         ctx->a_id = -1;
 173
 174     get_codec_data(pb, vst, ast, is_mythtv);
 175     return 0;
 176 }
 177
 178 #define HDRSIZE 12
 179
 180 static int nuv_packet(AVFormatContext *s, AVPacket *pkt) {
 181     NUVContext *ctx = (NUVContext *)s->priv_data;
 182     ByteIOContext *pb = &s->pb;
 183     uint8_t hdr[HDRSIZE];
 184     frametype_t frametype;
 185     int ret, size;
 186     while (!url_feof(pb)) {
 187         ret = get_buffer(pb, hdr, HDRSIZE);
 188         if (ret <= 0)
 189             return ret;
 190         frametype = hdr[0];
 191         size = PKTSIZE(LE_32(&hdr[8]));
 192         switch (frametype) {
 193             case NUV_VIDEO:
 194             case NUV_EXTRADATA:
 195                 if (ctx->v_id < 0) {
 196                     av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
 197                     url_fskip(pb, size);
 198                     break;
 199                 }
 200                 ret = av_new_packet(pkt, HDRSIZE + size);
 201                 if (ret < 0)
 202                     return ret;
 203                 pkt->pos = url_ftell(pb);
 204                 pkt->pts = LE_32(&hdr[4]);
 205                 pkt->stream_index = ctx->v_id;
 206                 memcpy(pkt->data, hdr, HDRSIZE);
 207                 ret = get_buffer(pb, pkt->data + HDRSIZE, size);
 208                 return ret;
 209             case NUV_AUDIO:
 210                 if (ctx->a_id < 0) {
 211                     av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
 212                     url_fskip(pb, size);
 213                     break;
 214                 }
 215                 ret = av_get_packet(pb, pkt, size);
 216                 pkt->pts = LE_32(&hdr[4]);
 217                 pkt->stream_index = ctx->a_id;
 218                 return ret;
 219             case NUV_SEEKP:
 220                 // contains no data, size value is invalid
 221                 break;
 222             default:
 223                 url_fskip(pb, size);
 224                 break;
 225         }
 226     }
 227     return AVERROR_IO;
 228 }
 229
 230 static AVInputFormat nuv_iformat = {
 231     "nuv",
 232     "NuppelVideo format",
 233     sizeof(NUVContext),
 234     nuv_probe,
 235     nuv_header,
 236     nuv_packet,
 237     NULL,
 238     NULL,
 239 };
 240
 241 int nuv_init(void) {
 242     av_register_input_format(&nuv_iformat);
 243     return 0;
 244 }
 245