Libav 0.7.1
libavformat/bink.c
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00001 /*
00002  * Bink demuxer
00003  * Copyright (c) 2008-2010 Peter Ross (pross@xvid.org)
00004  * Copyright (c) 2009 Daniel Verkamp (daniel@drv.nu)
00005  *
00006  * This file is part of Libav.
00007  *
00008  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00031 #include "libavutil/intreadwrite.h"
00032 #include "avformat.h"
00033 
00034 enum BinkAudFlags {
00035     BINK_AUD_16BITS = 0x4000, 
00036     BINK_AUD_STEREO = 0x2000,
00037     BINK_AUD_USEDCT = 0x1000,
00038 };
00039 
00040 #define BINK_EXTRADATA_SIZE     1
00041 #define BINK_MAX_AUDIO_TRACKS   256
00042 #define BINK_MAX_WIDTH          7680
00043 #define BINK_MAX_HEIGHT         4800
00044 
00045 typedef struct {
00046     uint32_t file_size;
00047 
00048     uint32_t num_audio_tracks;
00049     int current_track;      
00050     int64_t video_pts;
00051     int64_t audio_pts[BINK_MAX_AUDIO_TRACKS];
00052 
00053     uint32_t remain_packet_size;
00054 } BinkDemuxContext;
00055 
00056 static int probe(AVProbeData *p)
00057 {
00058     const uint8_t *b = p->buf;
00059 
00060     if ( b[0] == 'B' && b[1] == 'I' && b[2] == 'K' &&
00061         (b[3] == 'b' || b[3] == 'f' || b[3] == 'g' || b[3] == 'h' || b[3] == 'i') &&
00062         AV_RL32(b+8) > 0 &&  // num_frames
00063         AV_RL32(b+20) > 0 && AV_RL32(b+20) <= BINK_MAX_WIDTH &&
00064         AV_RL32(b+24) > 0 && AV_RL32(b+24) <= BINK_MAX_HEIGHT &&
00065         AV_RL32(b+28) > 0 && AV_RL32(b+32) > 0)  // fps num,den
00066         return AVPROBE_SCORE_MAX;
00067     return 0;
00068 }
00069 
00070 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
00071 {
00072     BinkDemuxContext *bink = s->priv_data;
00073     AVIOContext *pb = s->pb;
00074     uint32_t fps_num, fps_den;
00075     AVStream *vst, *ast;
00076     unsigned int i;
00077     uint32_t pos, next_pos;
00078     uint16_t flags;
00079     int keyframe;
00080 
00081     vst = av_new_stream(s, 0);
00082     if (!vst)
00083         return AVERROR(ENOMEM);
00084 
00085     vst->codec->codec_tag = avio_rl32(pb);
00086 
00087     bink->file_size = avio_rl32(pb) + 8;
00088     vst->duration   = avio_rl32(pb);
00089 
00090     if (vst->duration > 1000000) {
00091         av_log(s, AV_LOG_ERROR, "invalid header: more than 1000000 frames\n");
00092         return AVERROR(EIO);
00093     }
00094 
00095     if (avio_rl32(pb) > bink->file_size) {
00096         av_log(s, AV_LOG_ERROR,
00097                "invalid header: largest frame size greater than file size\n");
00098         return AVERROR(EIO);
00099     }
00100 
00101     avio_skip(pb, 4);
00102 
00103     vst->codec->width  = avio_rl32(pb);
00104     vst->codec->height = avio_rl32(pb);
00105 
00106     fps_num = avio_rl32(pb);
00107     fps_den = avio_rl32(pb);
00108     if (fps_num == 0 || fps_den == 0) {
00109         av_log(s, AV_LOG_ERROR, "invalid header: invalid fps (%d/%d)\n", fps_num, fps_den);
00110         return AVERROR(EIO);
00111     }
00112     av_set_pts_info(vst, 64, fps_den, fps_num);
00113 
00114     vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00115     vst->codec->codec_id   = CODEC_ID_BINKVIDEO;
00116     vst->codec->extradata  = av_mallocz(4 + FF_INPUT_BUFFER_PADDING_SIZE);
00117     vst->codec->extradata_size = 4;
00118     avio_read(pb, vst->codec->extradata, 4);
00119 
00120     bink->num_audio_tracks = avio_rl32(pb);
00121 
00122     if (bink->num_audio_tracks > BINK_MAX_AUDIO_TRACKS) {
00123         av_log(s, AV_LOG_ERROR,
00124                "invalid header: more than "AV_STRINGIFY(BINK_MAX_AUDIO_TRACKS)" audio tracks (%d)\n",
00125                bink->num_audio_tracks);
00126         return AVERROR(EIO);
00127     }
00128 
00129     if (bink->num_audio_tracks) {
00130         avio_skip(pb, 4 * bink->num_audio_tracks);
00131 
00132         for (i = 0; i < bink->num_audio_tracks; i++) {
00133             ast = av_new_stream(s, 1);
00134             if (!ast)
00135                 return AVERROR(ENOMEM);
00136             ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
00137             ast->codec->codec_tag   = vst->codec->codec_tag;
00138             ast->codec->sample_rate = avio_rl16(pb);
00139             av_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
00140             flags = avio_rl16(pb);
00141             ast->codec->codec_id = flags & BINK_AUD_USEDCT ?
00142                                    CODEC_ID_BINKAUDIO_DCT : CODEC_ID_BINKAUDIO_RDFT;
00143             ast->codec->channels = flags & BINK_AUD_STEREO ? 2 : 1;
00144         }
00145 
00146         for (i = 0; i < bink->num_audio_tracks; i++)
00147             s->streams[i + 1]->id = avio_rl32(pb);
00148     }
00149 
00150     /* frame index table */
00151     next_pos = avio_rl32(pb);
00152     for (i = 0; i < vst->duration; i++) {
00153         pos = next_pos;
00154         if (i == vst->duration - 1) {
00155             next_pos = bink->file_size;
00156             keyframe = 0;
00157         } else {
00158             next_pos = avio_rl32(pb);
00159             keyframe = pos & 1;
00160         }
00161         pos &= ~1;
00162         next_pos &= ~1;
00163 
00164         if (next_pos <= pos) {
00165             av_log(s, AV_LOG_ERROR, "invalid frame index table\n");
00166             return AVERROR(EIO);
00167         }
00168         av_add_index_entry(vst, pos, i, next_pos - pos, 0,
00169                            keyframe ? AVINDEX_KEYFRAME : 0);
00170     }
00171 
00172     avio_skip(pb, 4);
00173 
00174     bink->current_track = -1;
00175     return 0;
00176 }
00177 
00178 static int read_packet(AVFormatContext *s, AVPacket *pkt)
00179 {
00180     BinkDemuxContext *bink = s->priv_data;
00181     AVIOContext *pb = s->pb;
00182     int ret;
00183 
00184     if (bink->current_track < 0) {
00185         int index_entry;
00186         AVStream *st = s->streams[0]; // stream 0 is video stream with index
00187 
00188         if (bink->video_pts >= st->duration)
00189             return AVERROR(EIO);
00190 
00191         index_entry = av_index_search_timestamp(st, bink->video_pts,
00192                                                 AVSEEK_FLAG_ANY);
00193         if (index_entry < 0) {
00194             av_log(s, AV_LOG_ERROR,
00195                    "could not find index entry for frame %"PRId64"\n",
00196                    bink->video_pts);
00197             return AVERROR(EIO);
00198         }
00199 
00200         bink->remain_packet_size = st->index_entries[index_entry].size;
00201         bink->current_track = 0;
00202     }
00203 
00204     while (bink->current_track < bink->num_audio_tracks) {
00205         uint32_t audio_size = avio_rl32(pb);
00206         if (audio_size > bink->remain_packet_size - 4) {
00207             av_log(s, AV_LOG_ERROR,
00208                    "frame %"PRId64": audio size in header (%u) > size of packet left (%u)\n",
00209                    bink->video_pts, audio_size, bink->remain_packet_size);
00210             return AVERROR(EIO);
00211         }
00212         bink->remain_packet_size -= 4 + audio_size;
00213         bink->current_track++;
00214         if (audio_size >= 4) {
00215             /* get one audio packet per track */
00216             if ((ret = av_get_packet(pb, pkt, audio_size)) < 0)
00217                 return ret;
00218             pkt->stream_index = bink->current_track;
00219             pkt->pts = bink->audio_pts[bink->current_track - 1];
00220 
00221             /* Each audio packet reports the number of decompressed samples
00222                (in bytes). We use this value to calcuate the audio PTS */
00223             if (pkt->size >= 4)
00224                 bink->audio_pts[bink->current_track -1] +=
00225                     AV_RL32(pkt->data) / (2 * s->streams[bink->current_track]->codec->channels);
00226             return 0;
00227         } else {
00228             avio_skip(pb, audio_size);
00229         }
00230     }
00231 
00232     /* get video packet */
00233     if ((ret = av_get_packet(pb, pkt, bink->remain_packet_size)) < 0)
00234         return ret;
00235     pkt->stream_index = 0;
00236     pkt->pts = bink->video_pts++;
00237     pkt->flags |= AV_PKT_FLAG_KEY;
00238 
00239     /* -1 instructs the next call to read_packet() to read the next frame */
00240     bink->current_track = -1;
00241 
00242     return 0;
00243 }
00244 
00245 static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
00246 {
00247     BinkDemuxContext *bink = s->priv_data;
00248     AVStream *vst = s->streams[0];
00249 
00250     if (!s->pb->seekable)
00251         return -1;
00252 
00253     /* seek to the first frame */
00254     avio_seek(s->pb, vst->index_entries[0].pos, SEEK_SET);
00255     bink->video_pts = 0;
00256     memset(bink->audio_pts, 0, sizeof(bink->audio_pts));
00257     bink->current_track = -1;
00258     return 0;
00259 }
00260 
00261 AVInputFormat ff_bink_demuxer = {
00262     "bink",
00263     NULL_IF_CONFIG_SMALL("Bink"),
00264     sizeof(BinkDemuxContext),
00265     probe,
00266     read_header,
00267     read_packet,
00268     NULL,
00269     read_seek,
00270 };