FFmpeg: libavformat/iff.c Source File

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 
00036 #define ID_8SVX       MKTAG('8','S','V','X')
00037 #define ID_VHDR       MKTAG('V','H','D','R')
00038 #define ID_ATAK       MKTAG('A','T','A','K')
00039 #define ID_RLSE       MKTAG('R','L','S','E')
00040 #define ID_CHAN       MKTAG('C','H','A','N')
00041 #define ID_PBM        MKTAG('P','B','M',' ')
00042 #define ID_ILBM       MKTAG('I','L','B','M')
00043 #define ID_BMHD       MKTAG('B','M','H','D')
00044 #define ID_CAMG       MKTAG('C','A','M','G')
00045 #define ID_CMAP       MKTAG('C','M','A','P')
00046 
00047 #define ID_FORM       MKTAG('F','O','R','M')
00048 #define ID_ANNO       MKTAG('A','N','N','O')
00049 #define ID_AUTH       MKTAG('A','U','T','H')
00050 #define ID_CHRS       MKTAG('C','H','R','S')
00051 #define ID_COPYRIGHT  MKTAG('(','c',')',' ')
00052 #define ID_CSET       MKTAG('C','S','E','T')
00053 #define ID_FVER       MKTAG('F','V','E','R')
00054 #define ID_NAME       MKTAG('N','A','M','E')
00055 #define ID_TEXT       MKTAG('T','E','X','T')
00056 #define ID_BODY       MKTAG('B','O','D','Y')
00057 #define ID_ANNO       MKTAG('A','N','N','O')
00058 
00059 #define LEFT    2
00060 #define RIGHT   4
00061 #define STEREO  6
00062 
00071 #define IFF_EXTRA_VIDEO_SIZE 9
00072 
00073 typedef enum {
00074     COMP_NONE,
00075     COMP_FIB,
00076     COMP_EXP
00077 } svx8_compression_type;
00078 
00079 typedef enum {
00080     BITMAP_RAW,
00081     BITMAP_BYTERUN1
00082 } bitmap_compression_type;
00083 
00084 typedef struct {
00085     uint64_t  body_pos;
00086     uint32_t  body_size;
00087     uint32_t  sent_bytes;
00088     uint32_t  audio_frame_count;
00089     svx8_compression_type   svx8_compression;
00090     bitmap_compression_type bitmap_compression;  
00091     unsigned  bpp;          
00092     unsigned  ham;          
00093     unsigned  flags;        
00094     unsigned  transparency; 
00095     unsigned  masking;      
00096 } IffDemuxContext;
00097 
00098 /* Metadata string read */
00099 static int get_metadata(AVFormatContext *s,
00100                         const char *const tag,
00101                         const unsigned data_size)
00102 {
00103     uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
00104 
00105     if (!buf)
00106         return AVERROR(ENOMEM);
00107 
00108     if (avio_read(s->pb, buf, data_size) < 0) {
00109         av_free(buf);
00110         return AVERROR(EIO);
00111     }
00112     buf[data_size] = 0;
00113     av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
00114     return 0;
00115 }
00116 
00117 static int iff_probe(AVProbeData *p)
00118 {
00119     const uint8_t *d = p->buf;
00120 
00121     if ( AV_RL32(d)   == ID_FORM &&
00122          (AV_RL32(d+8) == ID_8SVX || AV_RL32(d+8) == ID_PBM || AV_RL32(d+8) == ID_ILBM) )
00123         return AVPROBE_SCORE_MAX;
00124     return 0;
00125 }
00126 
00127 static int iff_read_header(AVFormatContext *s,
00128                            AVFormatParameters *ap)
00129 {
00130     IffDemuxContext *iff = s->priv_data;
00131     AVIOContext *pb = s->pb;
00132     AVStream *st;
00133     uint8_t *buf;
00134     uint32_t chunk_id, data_size;
00135     uint32_t screenmode = 0;
00136     unsigned transparency = 0;
00137     unsigned masking = 0; // no mask
00138 
00139     st = av_new_stream(s, 0);
00140     if (!st)
00141         return AVERROR(ENOMEM);
00142 
00143     st->codec->channels = 1;
00144     avio_skip(pb, 8);
00145     // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
00146     st->codec->codec_tag = avio_rl32(pb);
00147 
00148     while(!url_feof(pb)) {
00149         uint64_t orig_pos;
00150         int res;
00151         const char *metadata_tag = NULL;
00152         chunk_id = avio_rl32(pb);
00153         data_size = avio_rb32(pb);
00154         orig_pos = avio_tell(pb);
00155 
00156         switch(chunk_id) {
00157         case ID_VHDR:
00158             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00159 
00160             if (data_size < 14)
00161                 return AVERROR_INVALIDDATA;
00162             avio_skip(pb, 12);
00163             st->codec->sample_rate = avio_rb16(pb);
00164             if (data_size >= 16) {
00165                 avio_skip(pb, 1);
00166                 iff->svx8_compression = avio_r8(pb);
00167             }
00168             break;
00169 
00170         case ID_BODY:
00171             iff->body_pos = avio_tell(pb);
00172             iff->body_size = data_size;
00173             break;
00174 
00175         case ID_CHAN:
00176             if (data_size < 4)
00177                 return AVERROR_INVALIDDATA;
00178             st->codec->channels = (avio_rb32(pb) < 6) ? 1 : 2;
00179             break;
00180 
00181         case ID_CAMG:
00182             if (data_size < 4)
00183                 return AVERROR_INVALIDDATA;
00184             screenmode                = avio_rb32(pb);
00185             break;
00186 
00187         case ID_CMAP:
00188             st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
00189             st->codec->extradata      = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
00190             if (!st->codec->extradata)
00191                 return AVERROR(ENOMEM);
00192             if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)
00193                 return AVERROR(EIO);
00194             break;
00195 
00196         case ID_BMHD:
00197             iff->bitmap_compression = -1;
00198             st->codec->codec_type            = AVMEDIA_TYPE_VIDEO;
00199             if (data_size <= 8)
00200                 return AVERROR_INVALIDDATA;
00201             st->codec->width                 = avio_rb16(pb);
00202             st->codec->height                = avio_rb16(pb);
00203             avio_skip(pb, 4); // x, y offset
00204             st->codec->bits_per_coded_sample = avio_r8(pb);
00205             if (data_size >= 10)
00206                 masking                      = avio_r8(pb);
00207             if (data_size >= 11)
00208                 iff->bitmap_compression      = avio_r8(pb);
00209             if (data_size >= 14) {
00210                 avio_skip(pb, 1); // padding
00211                 transparency                 = avio_rb16(pb);
00212             }
00213             if (data_size >= 16) {
00214                 st->sample_aspect_ratio.num  = avio_r8(pb);
00215                 st->sample_aspect_ratio.den  = avio_r8(pb);
00216             }
00217             break;
00218 
00219         case ID_ANNO:
00220         case ID_TEXT:      metadata_tag = "comment";   break;
00221         case ID_AUTH:      metadata_tag = "artist";    break;
00222         case ID_COPYRIGHT: metadata_tag = "copyright"; break;
00223         case ID_NAME:      metadata_tag = "title";     break;
00224         }
00225 
00226         if (metadata_tag) {
00227             if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
00228                 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!", metadata_tag);
00229                 return res;
00230             }
00231         }
00232         avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
00233     }
00234 
00235     avio_seek(pb, iff->body_pos, SEEK_SET);
00236 
00237     switch(st->codec->codec_type) {
00238     case AVMEDIA_TYPE_AUDIO:
00239         av_set_pts_info(st, 32, 1, st->codec->sample_rate);
00240 
00241         switch (iff->svx8_compression) {
00242         case COMP_NONE:
00243             st->codec->codec_id = CODEC_ID_8SVX_RAW;
00244             break;
00245         case COMP_FIB:
00246             st->codec->codec_id = CODEC_ID_8SVX_FIB;
00247             break;
00248         case COMP_EXP:
00249             st->codec->codec_id = CODEC_ID_8SVX_EXP;
00250             break;
00251         default:
00252             av_log(s, AV_LOG_ERROR,
00253                    "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
00254             return -1;
00255         }
00256 
00257         st->codec->bits_per_coded_sample = iff->svx8_compression == COMP_NONE ? 8 : 4;
00258         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
00259         st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
00260         break;
00261 
00262     case AVMEDIA_TYPE_VIDEO:
00263         iff->bpp          = st->codec->bits_per_coded_sample;
00264         if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
00265             iff->ham      = iff->bpp > 6 ? 6 : 4;
00266             st->codec->bits_per_coded_sample = 24;
00267         }
00268         iff->flags        = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
00269         iff->masking      = masking;
00270         iff->transparency = transparency;
00271 
00272         if (!st->codec->extradata) {
00273             st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;
00274             st->codec->extradata      = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
00275             if (!st->codec->extradata)
00276                 return AVERROR(ENOMEM);
00277         }
00278         buf = st->codec->extradata;
00279         bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);
00280         bytestream_put_byte(&buf, iff->bitmap_compression);
00281         bytestream_put_byte(&buf, iff->bpp);
00282         bytestream_put_byte(&buf, iff->ham);
00283         bytestream_put_byte(&buf, iff->flags);
00284         bytestream_put_be16(&buf, iff->transparency);
00285         bytestream_put_byte(&buf, iff->masking);
00286 
00287         switch (iff->bitmap_compression) {
00288         case BITMAP_RAW:
00289             st->codec->codec_id = CODEC_ID_IFF_ILBM;
00290             break;
00291         case BITMAP_BYTERUN1:
00292             st->codec->codec_id = CODEC_ID_IFF_BYTERUN1;
00293             break;
00294         default:
00295             av_log(s, AV_LOG_ERROR,
00296                    "Unknown bitmap compression method '%d'\n", iff->bitmap_compression);
00297             return AVERROR_INVALIDDATA;
00298         }
00299         break;
00300     default:
00301         return -1;
00302     }
00303 
00304     return 0;
00305 }
00306 
00307 static int iff_read_packet(AVFormatContext *s,
00308                            AVPacket *pkt)
00309 {
00310     IffDemuxContext *iff = s->priv_data;
00311     AVIOContext *pb = s->pb;
00312     AVStream *st = s->streams[0];
00313     int ret;
00314 
00315     if(iff->sent_bytes >= iff->body_size)
00316         return AVERROR(EIO);
00317 
00318     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00319         ret = av_get_packet(pb, pkt, iff->body_size);
00320     } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00321         uint8_t *buf;
00322 
00323         if (av_new_packet(pkt, iff->body_size + 2) < 0) {
00324             return AVERROR(ENOMEM);
00325         }
00326 
00327         buf = pkt->data;
00328         bytestream_put_be16(&buf, 2);
00329         ret = avio_read(pb, buf, iff->body_size);
00330     } else {
00331         av_abort();
00332     }
00333 
00334     if(iff->sent_bytes == 0)
00335         pkt->flags |= AV_PKT_FLAG_KEY;
00336     iff->sent_bytes = iff->body_size;
00337 
00338     pkt->stream_index = 0;
00339     return ret;
00340 }
00341 
00342 AVInputFormat ff_iff_demuxer = {
00343     "IFF",
00344     NULL_IF_CONFIG_SMALL("IFF format"),
00345     sizeof(IffDemuxContext),
00346     iff_probe,
00347     iff_read_header,
00348     iff_read_packet,
00349 };