libavformat/4xm.c

   1 /*
   2  * 4X Technologies .4xm File Demuxer (no muxer)
   3  * Copyright (c) 2003  The ffmpeg Project
   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 /**
  21  * @file 4xm.c
  22  * 4X Technologies file demuxer
  23  * by Mike Melanson (melanson@pcisys.net)
  24  * for more information on the .4xm file format, visit:
  25  *   http://www.pcisys.net/~melanson/codecs/
  26  */
  27
  28 #include "avformat.h"
  29
  30 #define LE_16(x)  ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
  31 #define LE_32(x)  ((((uint8_t*)(x))[3] << 24) | \
  32                    (((uint8_t*)(x))[2] << 16) | \
  33                    (((uint8_t*)(x))[1] << 8) | \
  34                     ((uint8_t*)(x))[0])
  35 #define BE_16(x)  ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
  36 #define BE_32(x)  ((((uint8_t*)(x))[0] << 24) | \
  37                    (((uint8_t*)(x))[1] << 16) | \
  38                    (((uint8_t*)(x))[2] << 8) | \
  39                     ((uint8_t*)(x))[3])
  40
  41 #define FOURCC_TAG( ch0, ch1, ch2, ch3 ) \
  42         ( (long)(unsigned char)(ch3) | \
  43         ( (long)(unsigned char)(ch2) << 8 ) | \
  44         ( (long)(unsigned char)(ch1) << 16 ) | \
  45         ( (long)(unsigned char)(ch0) << 24 ) )
  46
  47 #define  RIFF_TAG FOURCC_TAG('R', 'I', 'F', 'F')
  48 #define _4XMV_TAG FOURCC_TAG('4', 'X', 'M', 'V')
  49 #define  LIST_TAG FOURCC_TAG('L', 'I', 'S', 'T')
  50 #define  HEAD_TAG FOURCC_TAG('H', 'E', 'A', 'D')
  51 #define  TRK__TAG FOURCC_TAG('T', 'R', 'K', '_')
  52 #define  MOVI_TAG FOURCC_TAG('M', 'O', 'V', 'I')
  53 #define  VTRK_TAG FOURCC_TAG('V', 'T', 'R', 'K')
  54 #define  STRK_TAG FOURCC_TAG('S', 'T', 'R', 'K')
  55 #define  name_TAG FOURCC_TAG('n', 'a', 'm', 'e')
  56 #define  vtrk_TAG FOURCC_TAG('v', 't', 'r', 'k')
  57 #define  strk_TAG FOURCC_TAG('s', 't', 'r', 'k')
  58 #define  ifrm_TAG FOURCC_TAG('i', 'f', 'r', 'm')
  59 #define  pfrm_TAG FOURCC_TAG('p', 'f', 'r', 'm')
  60 #define  cfrm_TAG FOURCC_TAG('c', 'f', 'r', 'm')
  61 #define  snd__TAG FOURCC_TAG('s', 'n', 'd', '_')
  62 #define  _TAG FOURCC_TAG('', '', '', '')
  63
  64 #define vtrk_SIZE 0x44
  65 #define strk_SIZE 0x28
  66
  67 #define GET_LIST_HEADER() \
  68     fourcc_tag = get_be32(pb); \
  69     size = get_le32(pb); \
  70     if (fourcc_tag != LIST_TAG) \
  71         return AVERROR_INVALIDDATA; \
  72     fourcc_tag = get_be32(pb);
  73
  74 typedef struct AudioTrack {
  75     int sample_rate;
  76     int bits;
  77     int channels;
  78 } AudioTrack;
  79
  80 typedef struct FourxmDemuxContext {
  81     int width;
  82     int height;
  83     int track_count;
  84     AudioTrack *tracks;
  85     int selected_track;
  86 } FourxmDemuxContext;
  87
  88 static int fourxm_probe(AVProbeData *p)
  89 {
  90     if ((BE_32(&p->buf[0]) != RIFF_TAG) ||
  91         (BE_32(&p->buf[8]) != _4XMV_TAG))
  92         return 0;
  93
  94 printf ("  detected .4xm file\n");
  95
  96     return AVPROBE_SCORE_MAX;
  97 }
  98
  99 static int fourxm_read_header(AVFormatContext *s,
 100                              AVFormatParameters *ap)
 101 {
 102     ByteIOContext *pb = &s->pb;
 103     unsigned int fourcc_tag;
 104     unsigned int size;
 105     int header_size;
 106     FourxmDemuxContext *fourxm = (FourxmDemuxContext *)s->priv_data;
 107     unsigned char *header;
 108     int i;
 109     int current_track = -1;
 110     AVStream *st;
 111
 112     fourxm->track_count = 0;
 113     fourxm->tracks = NULL;
 114     fourxm->selected_track = 0;
 115
 116     /* skip the first 3 32-bit numbers */
 117     url_fseek(pb, 12, SEEK_CUR);
 118
 119     /* check for LIST-HEAD */
 120     GET_LIST_HEADER();
 121     header_size = size - 4;
 122     if (fourcc_tag != HEAD_TAG)
 123         return AVERROR_INVALIDDATA;
 124
 125     /* allocate space for the header and load the whole thing */
 126     header = av_malloc(header_size);
 127     if (!header)
 128         return AVERROR_NOMEM;
 129     if (get_buffer(pb, header, header_size) != header_size)
 130         return AVERROR_IO;
 131
 132     /* take the lazy approach and search for any and all vtrk and strk chunks */
 133     for (i = 0; i < header_size - 8; i++) {
 134         fourcc_tag = BE_32(&header[i]);
 135         size = LE_32(&header[i + 4]);
 136
 137         if (fourcc_tag == vtrk_TAG) {
 138             /* check that there is enough data */
 139             if (size != vtrk_SIZE) {
 140                 av_free(header);
 141                 return AVERROR_INVALIDDATA;
 142             }
 143             fourxm->width = LE_32(&header[i + 36]);
 144             fourxm->height = LE_32(&header[i + 40]);
 145             i += 8 + size;
 146         } else if (fourcc_tag == strk_TAG) {
 147             /* check that there is enough data */
 148             if (size != strk_SIZE) {
 149                 av_free(header);
 150                 return AVERROR_INVALIDDATA;
 151             }
 152             current_track = LE_32(&header[i + 8]);
 153             if (current_track + 1 > fourxm->track_count) {
 154                 fourxm->track_count++;
 155                 fourxm->tracks = av_realloc(fourxm->tracks, fourxm->track_count);
 156                 if (!fourxm->tracks) {
 157                     av_free(header);
 158                     return AVERROR_NOMEM;
 159                 }
 160             }
 161             fourxm->tracks[current_track].channels = LE_32(&header[i + 36]);
 162             fourxm->tracks[current_track].sample_rate = LE_32(&header[i + 40]);
 163             fourxm->tracks[current_track].bits = LE_32(&header[i + 44]);
 164             i += 8 + size;
 165         }
 166     }
 167
 168     av_free(header);
 169
 170     /* skip over the LIST-MOVI chunk (which is where the stream should be */
 171     GET_LIST_HEADER();
 172     if (fourcc_tag != MOVI_TAG)
 173         return AVERROR_INVALIDDATA;
 174
 175     if (current_track > -1) {
 176         st = av_new_stream(s, 0);
 177         if (!st)
 178             return AVERROR_NOMEM;
 179
 180         st->codec.codec_type = CODEC_TYPE_AUDIO;
 181         st->codec.codec_tag = 1;
 182         st->codec.channels = fourxm->tracks[current_track].channels;
 183         st->codec.sample_rate = fourxm->tracks[current_track].sample_rate;
 184         st->codec.bits_per_sample = fourxm->tracks[current_track].bits;
 185         st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
 186             st->codec.bits_per_sample;
 187         st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;
 188         if (st->codec.bits_per_sample == 8)
 189             st->codec.codec_id = CODEC_ID_PCM_U8;
 190         else
 191             st->codec.codec_id = CODEC_ID_PCM_S16LE;
 192     }
 193
 194     return 0;
 195 }
 196
 197 static int fourxm_read_packet(AVFormatContext *s,
 198                              AVPacket *pkt)
 199 {
 200     FourxmDemuxContext *fourxm = s->priv_data;
 201     ByteIOContext *pb = &s->pb;
 202     unsigned int fourcc_tag;
 203     unsigned int size;
 204     int ret = 0;
 205     int track_number;
 206     int packet_read = 0;
 207
 208     while (!packet_read) {
 209
 210         fourcc_tag = get_be32(pb);
 211         size = get_le32(pb);
 212         if (fourcc_tag == LIST_TAG) {
 213             /* skip the LIST-FRAM tag and get the next fourcc */
 214             get_be32(pb);
 215             fourcc_tag = get_be32(pb);
 216             size = get_le32(pb);
 217         }
 218
 219         if (url_feof(pb))
 220             return -EIO;
 221
 222         switch (fourcc_tag) {
 223
 224         case ifrm_TAG:
 225 printf (" %cfrm chunk\n", (char)(fourcc_tag >> 24) & 0xFF);
 226 url_fseek(pb, size, SEEK_CUR);
 227             break;
 228         case pfrm_TAG:
 229 printf (" %cfrm chunk\n", (char)(fourcc_tag >> 24) & 0xFF);
 230 url_fseek(pb, size, SEEK_CUR);
 231             break;
 232         case cfrm_TAG:{
 233 int unknown= get_le32(pb);
 234 int id= get_le32(pb);
 235 int whole= get_le32(pb);
 236 static int stats[1000];
 237 stats[id] += size - 12;
 238 printf(" cfrm chunk id:%d size:%d whole:%d until now:%d\n", id, size, whole, stats[id]);
 239 url_fseek(pb, size-12, SEEK_CUR);
 240             break;
 241         }
 242         case snd__TAG:
 243 printf (" snd_ chunk, ");
 244             track_number = get_le32(pb);
 245             size = get_le32(pb);
 246             if (track_number == fourxm->selected_track) {
 247 printf ("correct track, dispatching...\n");
 248                 if (av_new_packet(pkt, size))
 249                     return -EIO;
 250                 ret = get_buffer(&s->pb, pkt->data, size);
 251                 if (ret < 0)
 252                     av_free_packet(pkt);
 253                 packet_read = 1;
 254             } else {
 255 printf ("wrong track, skipping...\n");
 256                 url_fseek(pb, size, SEEK_CUR);
 257             }
 258             break;
 259
 260         default:
 261             url_fseek(pb, size, SEEK_CUR);
 262             break;
 263         }
 264     }
 265
 266     return ret;
 267 }
 268
 269 static int fourxm_read_close(AVFormatContext *s)
 270 {
 271     FourxmDemuxContext *fourxm = (FourxmDemuxContext *)s->priv_data;
 272
 273     av_free(fourxm->tracks);
 274
 275     return 0;
 276 }
 277
 278 static AVInputFormat fourxm_iformat = {
 279     "4xm",
 280     "4X Technologies format",
 281     sizeof(FourxmDemuxContext),
 282     fourxm_probe,
 283     fourxm_read_header,
 284     fourxm_read_packet,
 285     fourxm_read_close,
 286 };
 287
 288 int fourxm_init(void)
 289 {
 290     av_register_input_format(&fourxm_iformat);
 291     return 0;
 292 }