libavformat/4xm.c

   1 /*
   2  * 4X Technologies .4xm File Demuxer (no muxer)
   3  * Copyright (c) 2003  The ffmpeg Project
   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 /**
  23  * @file libavformat/4xm.c
  24  * 4X Technologies file demuxer
  25  * by Mike Melanson (melanson@pcisys.net)
  26  * for more information on the .4xm file format, visit:
  27  *   http://www.pcisys.net/~melanson/codecs/
  28  */
  29
  30 #include "libavutil/intreadwrite.h"
  31 #include "avformat.h"
  32
  33 #define     RIFF_TAG MKTAG('R', 'I', 'F', 'F')
  34 #define  FOURXMV_TAG MKTAG('4', 'X', 'M', 'V')
  35 #define     LIST_TAG MKTAG('L', 'I', 'S', 'T')
  36 #define     HEAD_TAG MKTAG('H', 'E', 'A', 'D')
  37 #define     TRK__TAG MKTAG('T', 'R', 'K', '_')
  38 #define     MOVI_TAG MKTAG('M', 'O', 'V', 'I')
  39 #define     VTRK_TAG MKTAG('V', 'T', 'R', 'K')
  40 #define     STRK_TAG MKTAG('S', 'T', 'R', 'K')
  41 #define     std__TAG MKTAG('s', 't', 'd', '_')
  42 #define     name_TAG MKTAG('n', 'a', 'm', 'e')
  43 #define     vtrk_TAG MKTAG('v', 't', 'r', 'k')
  44 #define     strk_TAG MKTAG('s', 't', 'r', 'k')
  45 #define     ifrm_TAG MKTAG('i', 'f', 'r', 'm')
  46 #define     pfrm_TAG MKTAG('p', 'f', 'r', 'm')
  47 #define     cfrm_TAG MKTAG('c', 'f', 'r', 'm')
  48 #define     ifr2_TAG MKTAG('i', 'f', 'r', '2')
  49 #define     pfr2_TAG MKTAG('p', 'f', 'r', '2')
  50 #define     cfr2_TAG MKTAG('c', 'f', 'r', '2')
  51 #define     snd__TAG MKTAG('s', 'n', 'd', '_')
  52
  53 #define vtrk_SIZE 0x44
  54 #define strk_SIZE 0x28
  55
  56 #define GET_LIST_HEADER() \
  57     fourcc_tag = get_le32(pb); \
  58     size = get_le32(pb); \
  59     if (fourcc_tag != LIST_TAG) \
  60         return AVERROR_INVALIDDATA; \
  61     fourcc_tag = get_le32(pb);
  62
  63 typedef struct AudioTrack {
  64     int sample_rate;
  65     int bits;
  66     int channels;
  67     int stream_index;
  68     int adpcm;
  69     int64_t audio_pts;
  70 } AudioTrack;
  71
  72 typedef struct FourxmDemuxContext {
  73     int width;
  74     int height;
  75     int video_stream_index;
  76     int track_count;
  77     AudioTrack *tracks;
  78
  79     int64_t video_pts;
  80     float fps;
  81 } FourxmDemuxContext;
  82
  83 static int fourxm_probe(AVProbeData *p)
  84 {
  85     if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
  86         (AV_RL32(&p->buf[8]) != FOURXMV_TAG))
  87         return 0;
  88
  89     return AVPROBE_SCORE_MAX;
  90 }
  91
  92 static int fourxm_read_header(AVFormatContext *s,
  93                               AVFormatParameters *ap)
  94 {
  95     ByteIOContext *pb = s->pb;
  96     unsigned int fourcc_tag;
  97     unsigned int size;
  98     int header_size;
  99     FourxmDemuxContext *fourxm = s->priv_data;
 100     unsigned char *header;
 101     int i, ret;
 102     AVStream *st;
 103
 104     fourxm->track_count = 0;
 105     fourxm->tracks = NULL;
 106     fourxm->fps = 1.0;
 107
 108     /* skip the first 3 32-bit numbers */
 109     url_fseek(pb, 12, SEEK_CUR);
 110
 111     /* check for LIST-HEAD */
 112     GET_LIST_HEADER();
 113     header_size = size - 4;
 114     if (fourcc_tag != HEAD_TAG || header_size < 0)
 115         return AVERROR_INVALIDDATA;
 116
 117     /* allocate space for the header and load the whole thing */
 118     header = av_malloc(header_size);
 119     if (!header)
 120         return AVERROR(ENOMEM);
 121     if (get_buffer(pb, header, header_size) != header_size){
 122         av_free(header);
 123         return AVERROR(EIO);
 124     }
 125
 126     /* take the lazy approach and search for any and all vtrk and strk chunks */
 127     for (i = 0; i < header_size - 8; i++) {
 128         fourcc_tag = AV_RL32(&header[i]);
 129         size = AV_RL32(&header[i + 4]);
 130
 131         if (fourcc_tag == std__TAG) {
 132             fourxm->fps = av_int2flt(AV_RL32(&header[i + 12]));
 133         } else if (fourcc_tag == vtrk_TAG) {
 134             /* check that there is enough data */
 135             if (size != vtrk_SIZE) {
 136                 ret= AVERROR_INVALIDDATA;
 137                 goto fail;
 138             }
 139             fourxm->width  = AV_RL32(&header[i + 36]);
 140             fourxm->height = AV_RL32(&header[i + 40]);
 141
 142             /* allocate a new AVStream */
 143             st = av_new_stream(s, 0);
 144             if (!st){
 145                 ret= AVERROR(ENOMEM);
 146                 goto fail;
 147             }
 148             av_set_pts_info(st, 60, 1, fourxm->fps);
 149
 150             fourxm->video_stream_index = st->index;
 151
 152             st->codec->codec_type = CODEC_TYPE_VIDEO;
 153             st->codec->codec_id = CODEC_ID_4XM;
 154             st->codec->extradata_size = 4;
 155             st->codec->extradata = av_malloc(4);
 156             AV_WL32(st->codec->extradata, AV_RL32(&header[i + 16]));
 157             st->codec->width  = fourxm->width;
 158             st->codec->height = fourxm->height;
 159
 160             i += 8 + size;
 161         } else if (fourcc_tag == strk_TAG) {
 162             int current_track;
 163             /* check that there is enough data */
 164             if (size != strk_SIZE) {
 165                 ret= AVERROR_INVALIDDATA;
 166                 goto fail;
 167             }
 168             current_track = AV_RL32(&header[i + 8]);
 169             if((unsigned)current_track >= UINT_MAX / sizeof(AudioTrack) - 1){
 170                 av_log(s, AV_LOG_ERROR, "current_track too large\n");
 171                 ret= -1;
 172                 goto fail;
 173             }
 174             if (current_track + 1 > fourxm->track_count) {
 175                 fourxm->track_count = current_track + 1;
 176                 fourxm->tracks = av_realloc(fourxm->tracks,
 177                     fourxm->track_count * sizeof(AudioTrack));
 178                 if (!fourxm->tracks) {
 179                     ret=  AVERROR(ENOMEM);
 180                     goto fail;
 181                 }
 182             }
 183             fourxm->tracks[current_track].adpcm       = AV_RL32(&header[i + 12]);
 184             fourxm->tracks[current_track].channels    = AV_RL32(&header[i + 36]);
 185             fourxm->tracks[current_track].sample_rate = AV_RL32(&header[i + 40]);
 186             fourxm->tracks[current_track].bits        = AV_RL32(&header[i + 44]);
 187             fourxm->tracks[current_track].audio_pts   = 0;
 188             i += 8 + size;
 189
 190             /* allocate a new AVStream */
 191             st = av_new_stream(s, current_track);
 192             if (!st){
 193                 ret= AVERROR(ENOMEM);
 194                 goto fail;
 195             }
 196
 197             av_set_pts_info(st, 60, 1, fourxm->tracks[current_track].sample_rate);
 198
 199             fourxm->tracks[current_track].stream_index = st->index;
 200
 201             st->codec->codec_type = CODEC_TYPE_AUDIO;
 202             st->codec->codec_tag = 0;
 203             st->codec->channels              = fourxm->tracks[current_track].channels;
 204             st->codec->sample_rate           = fourxm->tracks[current_track].sample_rate;
 205             st->codec->bits_per_coded_sample = fourxm->tracks[current_track].bits;
 206             st->codec->bit_rate              = st->codec->channels * st->codec->sample_rate *
 207                 st->codec->bits_per_coded_sample;
 208             st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
 209             if (fourxm->tracks[current_track].adpcm){
 210                 st->codec->codec_id = CODEC_ID_ADPCM_4XM;
 211             }else if (st->codec->bits_per_coded_sample == 8){
 212                 st->codec->codec_id = CODEC_ID_PCM_U8;
 213             }else
 214                 st->codec->codec_id = CODEC_ID_PCM_S16LE;
 215         }
 216     }
 217
 218     /* skip over the LIST-MOVI chunk (which is where the stream should be */
 219     GET_LIST_HEADER();
 220     if (fourcc_tag != MOVI_TAG){
 221         ret= AVERROR_INVALIDDATA;
 222         goto fail;
 223     }
 224
 225     av_free(header);
 226     /* initialize context members */
 227     fourxm->video_pts = -1;  /* first frame will push to 0 */
 228
 229     return 0;
 230 fail:
 231     av_freep(&fourxm->tracks);
 232     av_free(header);
 233     return ret;
 234 }
 235
 236 static int fourxm_read_packet(AVFormatContext *s,
 237                               AVPacket *pkt)
 238 {
 239     FourxmDemuxContext *fourxm = s->priv_data;
 240     ByteIOContext *pb = s->pb;
 241     unsigned int fourcc_tag;
 242     unsigned int size, out_size;
 243     int ret = 0;
 244     unsigned int track_number;
 245     int packet_read = 0;
 246     unsigned char header[8];
 247     int audio_frame_count;
 248
 249     while (!packet_read) {
 250
 251         if ((ret = get_buffer(s->pb, header, 8)) < 0)
 252             return ret;
 253         fourcc_tag = AV_RL32(&header[0]);
 254         size = AV_RL32(&header[4]);
 255         if (url_feof(pb))
 256             return AVERROR(EIO);
 257         switch (fourcc_tag) {
 258
 259         case LIST_TAG:
 260             /* this is a good time to bump the video pts */
 261             fourxm->video_pts ++;
 262
 263             /* skip the LIST-* tag and move on to the next fourcc */
 264             get_le32(pb);
 265             break;
 266
 267         case ifrm_TAG:
 268         case pfrm_TAG:
 269         case cfrm_TAG:
 270         case ifr2_TAG:
 271         case pfr2_TAG:
 272         case cfr2_TAG:
 273             /* allocate 8 more bytes than 'size' to account for fourcc
 274              * and size */
 275             if (size + 8 < size || av_new_packet(pkt, size + 8))
 276                 return AVERROR(EIO);
 277             pkt->stream_index = fourxm->video_stream_index;
 278             pkt->pts = fourxm->video_pts;
 279             pkt->pos = url_ftell(s->pb);
 280             memcpy(pkt->data, header, 8);
 281             ret = get_buffer(s->pb, &pkt->data[8], size);
 282
 283             if (ret < 0){
 284                 av_free_packet(pkt);
 285             }else
 286                 packet_read = 1;
 287             break;
 288
 289         case snd__TAG:
 290             track_number = get_le32(pb);
 291             out_size= get_le32(pb);
 292             size-=8;
 293
 294             if (track_number < fourxm->track_count) {
 295                 ret= av_get_packet(s->pb, pkt, size);
 296                 if(ret<0)
 297                     return AVERROR(EIO);
 298                 pkt->stream_index =
 299                     fourxm->tracks[track_number].stream_index;
 300                 pkt->pts = fourxm->tracks[track_number].audio_pts;
 301                 packet_read = 1;
 302
 303                 /* pts accounting */
 304                 audio_frame_count = size;
 305                 if (fourxm->tracks[track_number].adpcm)
 306                     audio_frame_count -=
 307                         2 * (fourxm->tracks[track_number].channels);
 308                 audio_frame_count /=
 309                       fourxm->tracks[track_number].channels;
 310                 if (fourxm->tracks[track_number].adpcm){
 311                     audio_frame_count *= 2;
 312                 }else
 313                     audio_frame_count /=
 314                     (fourxm->tracks[track_number].bits / 8);
 315                 fourxm->tracks[track_number].audio_pts += audio_frame_count;
 316
 317             } else {
 318                 url_fseek(pb, size, SEEK_CUR);
 319             }
 320             break;
 321
 322         default:
 323             url_fseek(pb, size, SEEK_CUR);
 324             break;
 325         }
 326     }
 327     return ret;
 328 }
 329
 330 static int fourxm_read_close(AVFormatContext *s)
 331 {
 332     FourxmDemuxContext *fourxm = s->priv_data;
 333
 334     av_freep(&fourxm->tracks);
 335
 336     return 0;
 337 }
 338
 339 AVInputFormat fourxm_demuxer = {
 340     "4xm",
 341     NULL_IF_CONFIG_SMALL("4X Technologies format"),
 342     sizeof(FourxmDemuxContext),
 343     fourxm_probe,
 344     fourxm_read_header,
 345     fourxm_read_packet,
 346     fourxm_read_close,
 347 };