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libavformat/iff.c

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00001 /*
00002  * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
00003  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
00004  * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00031 #include "libavcodec/bytestream.h"
00032 #include "libavutil/intreadwrite.h"
00033 #include "libavutil/dict.h"
00034 #include "avformat.h"
00035 #include "internal.h"
00036 
00037 #define ID_8SVX       MKTAG('8','S','V','X')
00038 #define ID_VHDR       MKTAG('V','H','D','R')
00039 #define ID_ATAK       MKTAG('A','T','A','K')
00040 #define ID_RLSE       MKTAG('R','L','S','E')
00041 #define ID_CHAN       MKTAG('C','H','A','N')
00042 #define ID_PBM        MKTAG('P','B','M',' ')
00043 #define ID_ILBM       MKTAG('I','L','B','M')
00044 #define ID_BMHD       MKTAG('B','M','H','D')
00045 #define ID_CAMG       MKTAG('C','A','M','G')
00046 #define ID_CMAP       MKTAG('C','M','A','P')
00047 #define ID_ACBM       MKTAG('A','C','B','M')
00048 
00049 #define ID_FORM       MKTAG('F','O','R','M')
00050 #define ID_ANNO       MKTAG('A','N','N','O')
00051 #define ID_AUTH       MKTAG('A','U','T','H')
00052 #define ID_CHRS       MKTAG('C','H','R','S')
00053 #define ID_COPYRIGHT  MKTAG('(','c',')',' ')
00054 #define ID_CSET       MKTAG('C','S','E','T')
00055 #define ID_FVER       MKTAG('F','V','E','R')
00056 #define ID_NAME       MKTAG('N','A','M','E')
00057 #define ID_TEXT       MKTAG('T','E','X','T')
00058 #define ID_ABIT       MKTAG('A','B','I','T')
00059 #define ID_BODY       MKTAG('B','O','D','Y')
00060 #define ID_ANNO       MKTAG('A','N','N','O')
00061 
00062 #define LEFT    2
00063 #define RIGHT   4
00064 #define STEREO  6
00065 
00074 #define IFF_EXTRA_VIDEO_SIZE 9
00075 
00076 typedef enum {
00077     COMP_NONE,
00078     COMP_FIB,
00079     COMP_EXP
00080 } svx8_compression_type;
00081 
00082 typedef enum {
00083     BITMAP_RAW,
00084     BITMAP_BYTERUN1
00085 } bitmap_compression_type;
00086 
00087 typedef struct {
00088     uint64_t  body_pos;
00089     uint32_t  body_size;
00090     uint32_t  sent_bytes;
00091     svx8_compression_type   svx8_compression;
00092     bitmap_compression_type bitmap_compression;  
00093     unsigned  bpp;          
00094     unsigned  ham;          
00095     unsigned  flags;        
00096     unsigned  transparency; 
00097     unsigned  masking;      
00098 } IffDemuxContext;
00099 
00100 /* Metadata string read */
00101 static int get_metadata(AVFormatContext *s,
00102                         const char *const tag,
00103                         const unsigned data_size)
00104 {
00105     uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
00106 
00107     if (!buf)
00108         return AVERROR(ENOMEM);
00109 
00110     if (avio_read(s->pb, buf, data_size) < 0) {
00111         av_free(buf);
00112         return AVERROR(EIO);
00113     }
00114     buf[data_size] = 0;
00115     av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
00116     return 0;
00117 }
00118 
00119 static int iff_probe(AVProbeData *p)
00120 {
00121     const uint8_t *d = p->buf;
00122 
00123     if ( AV_RL32(d)   == ID_FORM &&
00124          (AV_RL32(d+8) == ID_8SVX || AV_RL32(d+8) == ID_PBM || AV_RL32(d+8) == ID_ILBM || AV_RL32(d+8) == ID_ACBM) )
00125         return AVPROBE_SCORE_MAX;
00126     return 0;
00127 }
00128 
00129 static int iff_read_header(AVFormatContext *s,
00130                            AVFormatParameters *ap)
00131 {
00132     IffDemuxContext *iff = s->priv_data;
00133     AVIOContext *pb = s->pb;
00134     AVStream *st;
00135     uint8_t *buf;
00136     uint32_t chunk_id, data_size;
00137     uint32_t screenmode = 0;
00138     unsigned transparency = 0;
00139     unsigned masking = 0; // no mask
00140 
00141     st = avformat_new_stream(s, NULL);
00142     if (!st)
00143         return AVERROR(ENOMEM);
00144 
00145     st->codec->channels = 1;
00146     avio_skip(pb, 8);
00147     // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
00148     st->codec->codec_tag = avio_rl32(pb);
00149 
00150     while(!url_feof(pb)) {
00151         uint64_t orig_pos;
00152         int res;
00153         const char *metadata_tag = NULL;
00154         chunk_id = avio_rl32(pb);
00155         data_size = avio_rb32(pb);
00156         orig_pos = avio_tell(pb);
00157 
00158         switch(chunk_id) {
00159         case ID_VHDR:
00160             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00161 
00162             if (data_size < 14)
00163                 return AVERROR_INVALIDDATA;
00164             avio_skip(pb, 12);
00165             st->codec->sample_rate = avio_rb16(pb);
00166             if (data_size >= 16) {
00167                 avio_skip(pb, 1);
00168                 iff->svx8_compression = avio_r8(pb);
00169             }
00170             break;
00171 
00172         case ID_ABIT:
00173         case ID_BODY:
00174             iff->body_pos = avio_tell(pb);
00175             iff->body_size = data_size;
00176             break;
00177 
00178         case ID_CHAN:
00179             if (data_size < 4)
00180                 return AVERROR_INVALIDDATA;
00181             st->codec->channels = (avio_rb32(pb) < 6) ? 1 : 2;
00182             break;
00183 
00184         case ID_CAMG:
00185             if (data_size < 4)
00186                 return AVERROR_INVALIDDATA;
00187             screenmode                = avio_rb32(pb);
00188             break;
00189 
00190         case ID_CMAP:
00191             st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
00192             st->codec->extradata      = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
00193             if (!st->codec->extradata)
00194                 return AVERROR(ENOMEM);
00195             if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)
00196                 return AVERROR(EIO);
00197             break;
00198 
00199         case ID_BMHD:
00200             iff->bitmap_compression = -1;
00201             st->codec->codec_type            = AVMEDIA_TYPE_VIDEO;
00202             if (data_size <= 8)
00203                 return AVERROR_INVALIDDATA;
00204             st->codec->width                 = avio_rb16(pb);
00205             st->codec->height                = avio_rb16(pb);
00206             avio_skip(pb, 4); // x, y offset
00207             st->codec->bits_per_coded_sample = avio_r8(pb);
00208             if (data_size >= 10)
00209                 masking                      = avio_r8(pb);
00210             if (data_size >= 11)
00211                 iff->bitmap_compression      = avio_r8(pb);
00212             if (data_size >= 14) {
00213                 avio_skip(pb, 1); // padding
00214                 transparency                 = avio_rb16(pb);
00215             }
00216             if (data_size >= 16) {
00217                 st->sample_aspect_ratio.num  = avio_r8(pb);
00218                 st->sample_aspect_ratio.den  = avio_r8(pb);
00219             }
00220             break;
00221 
00222         case ID_ANNO:
00223         case ID_TEXT:      metadata_tag = "comment";   break;
00224         case ID_AUTH:      metadata_tag = "artist";    break;
00225         case ID_COPYRIGHT: metadata_tag = "copyright"; break;
00226         case ID_NAME:      metadata_tag = "title";     break;
00227         }
00228 
00229         if (metadata_tag) {
00230             if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
00231                 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!", metadata_tag);
00232                 return res;
00233             }
00234         }
00235         avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
00236     }
00237 
00238     avio_seek(pb, iff->body_pos, SEEK_SET);
00239 
00240     switch(st->codec->codec_type) {
00241     case AVMEDIA_TYPE_AUDIO:
00242         avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
00243 
00244         switch (iff->svx8_compression) {
00245         case COMP_NONE:
00246             st->codec->codec_id = CODEC_ID_PCM_S8_PLANAR;
00247             break;
00248         case COMP_FIB:
00249             st->codec->codec_id = CODEC_ID_8SVX_FIB;
00250             break;
00251         case COMP_EXP:
00252             st->codec->codec_id = CODEC_ID_8SVX_EXP;
00253             break;
00254         default:
00255             av_log(s, AV_LOG_ERROR,
00256                    "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
00257             return -1;
00258         }
00259 
00260         st->codec->bits_per_coded_sample = iff->svx8_compression == COMP_NONE ? 8 : 4;
00261         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
00262         st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
00263         break;
00264 
00265     case AVMEDIA_TYPE_VIDEO:
00266         iff->bpp          = st->codec->bits_per_coded_sample;
00267         if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
00268             iff->ham      = iff->bpp > 6 ? 6 : 4;
00269             st->codec->bits_per_coded_sample = 24;
00270         }
00271         iff->flags        = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
00272         iff->masking      = masking;
00273         iff->transparency = transparency;
00274 
00275         if (!st->codec->extradata) {
00276             st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;
00277             st->codec->extradata      = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
00278             if (!st->codec->extradata)
00279                 return AVERROR(ENOMEM);
00280         }
00281         buf = st->codec->extradata;
00282         bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);
00283         bytestream_put_byte(&buf, iff->bitmap_compression);
00284         bytestream_put_byte(&buf, iff->bpp);
00285         bytestream_put_byte(&buf, iff->ham);
00286         bytestream_put_byte(&buf, iff->flags);
00287         bytestream_put_be16(&buf, iff->transparency);
00288         bytestream_put_byte(&buf, iff->masking);
00289 
00290         switch (iff->bitmap_compression) {
00291         case BITMAP_RAW:
00292             st->codec->codec_id = CODEC_ID_IFF_ILBM;
00293             break;
00294         case BITMAP_BYTERUN1:
00295             st->codec->codec_id = CODEC_ID_IFF_BYTERUN1;
00296             break;
00297         default:
00298             av_log(s, AV_LOG_ERROR,
00299                    "Unknown bitmap compression method '%d'\n", iff->bitmap_compression);
00300             return AVERROR_INVALIDDATA;
00301         }
00302         break;
00303     default:
00304         return -1;
00305     }
00306 
00307     return 0;
00308 }
00309 
00310 static int iff_read_packet(AVFormatContext *s,
00311                            AVPacket *pkt)
00312 {
00313     IffDemuxContext *iff = s->priv_data;
00314     AVIOContext *pb = s->pb;
00315     AVStream *st = s->streams[0];
00316     int ret;
00317 
00318     if(iff->sent_bytes >= iff->body_size)
00319         return AVERROR_EOF;
00320 
00321     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00322         ret = av_get_packet(pb, pkt, iff->body_size);
00323     } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00324         uint8_t *buf;
00325 
00326         if (av_new_packet(pkt, iff->body_size + 2) < 0) {
00327             return AVERROR(ENOMEM);
00328         }
00329 
00330         buf = pkt->data;
00331         bytestream_put_be16(&buf, 2);
00332         ret = avio_read(pb, buf, iff->body_size);
00333     } else {
00334         av_abort();
00335     }
00336 
00337     if(iff->sent_bytes == 0)
00338         pkt->flags |= AV_PKT_FLAG_KEY;
00339     iff->sent_bytes = iff->body_size;
00340 
00341     pkt->stream_index = 0;
00342     return ret;
00343 }
00344 
00345 AVInputFormat ff_iff_demuxer = {
00346     .name           = "IFF",
00347     .long_name      = NULL_IF_CONFIG_SMALL("IFF format"),
00348     .priv_data_size = sizeof(IffDemuxContext),
00349     .read_probe     = iff_probe,
00350     .read_header    = iff_read_header,
00351     .read_packet    = iff_read_packet,
00352 };
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