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Member "quicktime4linux-2.3/thirdparty/ffmpeg.053108/libavformat/4xm.c" (8 Aug 2008, 10850 Bytes) of package /linux/privat/old/quicktime4linux-2.3-src.tar.gz:


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    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 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 "avformat.h"
   31 
   32 #define  RIFF_TAG MKTAG('R', 'I', 'F', 'F')
   33 #define _4XMV_TAG MKTAG('4', 'X', 'M', 'V')
   34 #define  LIST_TAG MKTAG('L', 'I', 'S', 'T')
   35 #define  HEAD_TAG MKTAG('H', 'E', 'A', 'D')
   36 #define  TRK__TAG MKTAG('T', 'R', 'K', '_')
   37 #define  MOVI_TAG MKTAG('M', 'O', 'V', 'I')
   38 #define  VTRK_TAG MKTAG('V', 'T', 'R', 'K')
   39 #define  STRK_TAG MKTAG('S', 'T', 'R', 'K')
   40 #define  std__TAG MKTAG('s', 't', 'd', '_')
   41 #define  name_TAG MKTAG('n', 'a', 'm', 'e')
   42 #define  vtrk_TAG MKTAG('v', 't', 'r', 'k')
   43 #define  strk_TAG MKTAG('s', 't', 'r', 'k')
   44 #define  ifrm_TAG MKTAG('i', 'f', 'r', 'm')
   45 #define  pfrm_TAG MKTAG('p', 'f', 'r', 'm')
   46 #define  cfrm_TAG MKTAG('c', 'f', 'r', 'm')
   47 #define  ifr2_TAG MKTAG('i', 'f', 'r', '2')
   48 #define  pfr2_TAG MKTAG('p', 'f', 'r', '2')
   49 #define  cfr2_TAG MKTAG('c', 'f', 'r', '2')
   50 #define  snd__TAG MKTAG('s', 'n', 'd', '_')
   51 
   52 #define vtrk_SIZE 0x44
   53 #define strk_SIZE 0x28
   54 
   55 #define GET_LIST_HEADER() \
   56     fourcc_tag = get_le32(pb); \
   57     size = get_le32(pb); \
   58     if (fourcc_tag != LIST_TAG) \
   59         return AVERROR_INVALIDDATA; \
   60     fourcc_tag = get_le32(pb);
   61 
   62 typedef struct AudioTrack {
   63     int sample_rate;
   64     int bits;
   65     int channels;
   66     int stream_index;
   67     int adpcm;
   68 } AudioTrack;
   69 
   70 typedef struct FourxmDemuxContext {
   71     int width;
   72     int height;
   73     int video_stream_index;
   74     int track_count;
   75     AudioTrack *tracks;
   76     int selected_track;
   77 
   78     int64_t audio_pts;
   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]) != _4XMV_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;
  102     int current_track = -1;
  103     AVStream *st;
  104 
  105     fourxm->track_count = 0;
  106     fourxm->tracks = NULL;
  107     fourxm->selected_track = 0;
  108     fourxm->fps = 1.0;
  109 
  110     /* skip the first 3 32-bit numbers */
  111     url_fseek(pb, 12, SEEK_CUR);
  112 
  113     /* check for LIST-HEAD */
  114     GET_LIST_HEADER();
  115     header_size = size - 4;
  116     if (fourcc_tag != HEAD_TAG)
  117         return AVERROR_INVALIDDATA;
  118 
  119     /* allocate space for the header and load the whole thing */
  120     header = av_malloc(header_size);
  121     if (!header)
  122         return AVERROR(ENOMEM);
  123     if (get_buffer(pb, header, header_size) != header_size)
  124         return AVERROR(EIO);
  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                 av_free(header);
  137                 return AVERROR_INVALIDDATA;
  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                 return AVERROR(ENOMEM);
  146             av_set_pts_info(st, 60, 1, fourxm->fps);
  147 
  148             fourxm->video_stream_index = st->index;
  149 
  150             st->codec->codec_type = CODEC_TYPE_VIDEO;
  151             st->codec->codec_id = CODEC_ID_4XM;
  152             st->codec->extradata_size = 4;
  153             st->codec->extradata = av_malloc(4);
  154             AV_WL32(st->codec->extradata, AV_RL32(&header[i + 16]));
  155             st->codec->width = fourxm->width;
  156             st->codec->height = fourxm->height;
  157 
  158             i += 8 + size;
  159         } else if (fourcc_tag == strk_TAG) {
  160             /* check that there is enough data */
  161             if (size != strk_SIZE) {
  162                 av_free(header);
  163                 return AVERROR_INVALIDDATA;
  164             }
  165             current_track = AV_RL32(&header[i + 8]);
  166             if (current_track + 1 > fourxm->track_count) {
  167                 fourxm->track_count = current_track + 1;
  168                 if((unsigned)fourxm->track_count >= UINT_MAX / sizeof(AudioTrack))
  169                     return -1;
  170                 fourxm->tracks = av_realloc(fourxm->tracks,
  171                     fourxm->track_count * sizeof(AudioTrack));
  172                 if (!fourxm->tracks) {
  173                     av_free(header);
  174                     return AVERROR(ENOMEM);
  175                 }
  176             }
  177             fourxm->tracks[current_track].adpcm = AV_RL32(&header[i + 12]);
  178             fourxm->tracks[current_track].channels = AV_RL32(&header[i + 36]);
  179             fourxm->tracks[current_track].sample_rate = AV_RL32(&header[i + 40]);
  180             fourxm->tracks[current_track].bits = AV_RL32(&header[i + 44]);
  181             i += 8 + size;
  182 
  183             /* allocate a new AVStream */
  184             st = av_new_stream(s, current_track);
  185             if (!st)
  186                 return AVERROR(ENOMEM);
  187 
  188             av_set_pts_info(st, 60, 1, fourxm->tracks[current_track].sample_rate);
  189 
  190             fourxm->tracks[current_track].stream_index = st->index;
  191 
  192             st->codec->codec_type = CODEC_TYPE_AUDIO;
  193             st->codec->codec_tag = 0;
  194             st->codec->channels = fourxm->tracks[current_track].channels;
  195             st->codec->sample_rate = fourxm->tracks[current_track].sample_rate;
  196             st->codec->bits_per_sample = fourxm->tracks[current_track].bits;
  197             st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
  198                 st->codec->bits_per_sample;
  199             st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
  200             if (fourxm->tracks[current_track].adpcm)
  201                 st->codec->codec_id = CODEC_ID_ADPCM_4XM;
  202             else if (st->codec->bits_per_sample == 8)
  203                 st->codec->codec_id = CODEC_ID_PCM_U8;
  204             else
  205                 st->codec->codec_id = CODEC_ID_PCM_S16LE;
  206         }
  207     }
  208 
  209     av_free(header);
  210 
  211     /* skip over the LIST-MOVI chunk (which is where the stream should be */
  212     GET_LIST_HEADER();
  213     if (fourcc_tag != MOVI_TAG)
  214         return AVERROR_INVALIDDATA;
  215 
  216     /* initialize context members */
  217     fourxm->video_pts = -1;  /* first frame will push to 0 */
  218     fourxm->audio_pts = 0;
  219 
  220     return 0;
  221 }
  222 
  223 static int fourxm_read_packet(AVFormatContext *s,
  224                               AVPacket *pkt)
  225 {
  226     FourxmDemuxContext *fourxm = s->priv_data;
  227     ByteIOContext *pb = s->pb;
  228     unsigned int fourcc_tag;
  229     unsigned int size, out_size;
  230     int ret = 0;
  231     int track_number;
  232     int packet_read = 0;
  233     unsigned char header[8];
  234     int audio_frame_count;
  235 
  236     while (!packet_read) {
  237 
  238         if ((ret = get_buffer(s->pb, header, 8)) < 0)
  239             return ret;
  240         fourcc_tag = AV_RL32(&header[0]);
  241         size = AV_RL32(&header[4]);
  242         if (url_feof(pb))
  243             return AVERROR(EIO);
  244         switch (fourcc_tag) {
  245 
  246         case LIST_TAG:
  247             /* this is a good time to bump the video pts */
  248             fourxm->video_pts ++;
  249 
  250             /* skip the LIST-* tag and move on to the next fourcc */
  251             get_le32(pb);
  252             break;
  253 
  254         case ifrm_TAG:
  255         case pfrm_TAG:
  256         case cfrm_TAG:
  257         case ifr2_TAG:
  258         case pfr2_TAG:
  259         case cfr2_TAG:
  260         {
  261 
  262             /* allocate 8 more bytes than 'size' to account for fourcc
  263              * and size */
  264             if (size + 8 < size || av_new_packet(pkt, size + 8))
  265                 return AVERROR(EIO);
  266             pkt->stream_index = fourxm->video_stream_index;
  267             pkt->pts = fourxm->video_pts;
  268             pkt->pos = url_ftell(s->pb);
  269             memcpy(pkt->data, header, 8);
  270             ret = get_buffer(s->pb, &pkt->data[8], size);
  271 
  272             if (ret < 0)
  273                 av_free_packet(pkt);
  274             else
  275                 packet_read = 1;
  276             break;
  277         }
  278 
  279         case snd__TAG:
  280             track_number = get_le32(pb);
  281             out_size= get_le32(pb);
  282             size-=8;
  283 
  284             if (track_number == fourxm->selected_track) {
  285                 ret= av_get_packet(s->pb, pkt, size);
  286                 if(ret<0)
  287                     return AVERROR(EIO);
  288                 pkt->stream_index =
  289                     fourxm->tracks[fourxm->selected_track].stream_index;
  290                 pkt->pts = fourxm->audio_pts;
  291                 packet_read = 1;
  292 
  293                 /* pts accounting */
  294                 audio_frame_count = size;
  295                 if (fourxm->tracks[fourxm->selected_track].adpcm)
  296                     audio_frame_count -=
  297                         2 * (fourxm->tracks[fourxm->selected_track].channels);
  298                 audio_frame_count /=
  299                       fourxm->tracks[fourxm->selected_track].channels;
  300                 if (fourxm->tracks[fourxm->selected_track].adpcm)
  301                     audio_frame_count *= 2;
  302                 else
  303                     audio_frame_count /=
  304                     (fourxm->tracks[fourxm->selected_track].bits / 8);
  305                 fourxm->audio_pts += audio_frame_count;
  306 
  307             } else {
  308                 url_fseek(pb, size, SEEK_CUR);
  309             }
  310             break;
  311 
  312         default:
  313             url_fseek(pb, size, SEEK_CUR);
  314             break;
  315         }
  316     }
  317     return ret;
  318 }
  319 
  320 static int fourxm_read_close(AVFormatContext *s)
  321 {
  322     FourxmDemuxContext *fourxm = s->priv_data;
  323 
  324     av_free(fourxm->tracks);
  325 
  326     return 0;
  327 }
  328 
  329 AVInputFormat fourxm_demuxer = {
  330     "4xm",
  331     "4X Technologies format",
  332     sizeof(FourxmDemuxContext),
  333     fourxm_probe,
  334     fourxm_read_header,
  335     fourxm_read_packet,
  336     fourxm_read_close,
  337 };