• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • Examples
  • File List
  • Globals

libavformat/bink.c

Go to the documentation of this file.
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 #include "internal.h"
00034 
00035 enum BinkAudFlags {
00036     BINK_AUD_16BITS = 0x4000, 
00037     BINK_AUD_STEREO = 0x2000,
00038     BINK_AUD_USEDCT = 0x1000,
00039 };
00040 
00041 #define BINK_EXTRADATA_SIZE     1
00042 #define BINK_MAX_AUDIO_TRACKS   256
00043 #define BINK_MAX_WIDTH          7680
00044 #define BINK_MAX_HEIGHT         4800
00045 
00046 typedef struct {
00047     uint32_t file_size;
00048 
00049     uint32_t num_audio_tracks;
00050     int current_track;      
00051     int64_t video_pts;
00052     int64_t audio_pts[BINK_MAX_AUDIO_TRACKS];
00053 
00054     uint32_t remain_packet_size;
00055 } BinkDemuxContext;
00056 
00057 static int probe(AVProbeData *p)
00058 {
00059     const uint8_t *b = p->buf;
00060 
00061     if ( b[0] == 'B' && b[1] == 'I' && b[2] == 'K' &&
00062         (b[3] == 'b' || b[3] == 'f' || b[3] == 'g' || b[3] == 'h' || b[3] == 'i') &&
00063         AV_RL32(b+8) > 0 &&  // num_frames
00064         AV_RL32(b+20) > 0 && AV_RL32(b+20) <= BINK_MAX_WIDTH &&
00065         AV_RL32(b+24) > 0 && AV_RL32(b+24) <= BINK_MAX_HEIGHT &&
00066         AV_RL32(b+28) > 0 && AV_RL32(b+32) > 0)  // fps num,den
00067         return AVPROBE_SCORE_MAX;
00068     return 0;
00069 }
00070 
00071 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
00072 {
00073     BinkDemuxContext *bink = s->priv_data;
00074     AVIOContext *pb = s->pb;
00075     uint32_t fps_num, fps_den;
00076     AVStream *vst, *ast;
00077     unsigned int i;
00078     uint32_t pos, next_pos;
00079     uint16_t flags;
00080     int keyframe;
00081 
00082     vst = avformat_new_stream(s, NULL);
00083     if (!vst)
00084         return AVERROR(ENOMEM);
00085 
00086     vst->codec->codec_tag = avio_rl32(pb);
00087 
00088     bink->file_size = avio_rl32(pb) + 8;
00089     vst->duration   = avio_rl32(pb);
00090 
00091     if (vst->duration > 1000000) {
00092         av_log(s, AV_LOG_ERROR, "invalid header: more than 1000000 frames\n");
00093         return AVERROR(EIO);
00094     }
00095 
00096     if (avio_rl32(pb) > bink->file_size) {
00097         av_log(s, AV_LOG_ERROR,
00098                "invalid header: largest frame size greater than file size\n");
00099         return AVERROR(EIO);
00100     }
00101 
00102     avio_skip(pb, 4);
00103 
00104     vst->codec->width  = avio_rl32(pb);
00105     vst->codec->height = avio_rl32(pb);
00106 
00107     fps_num = avio_rl32(pb);
00108     fps_den = avio_rl32(pb);
00109     if (fps_num == 0 || fps_den == 0) {
00110         av_log(s, AV_LOG_ERROR, "invalid header: invalid fps (%d/%d)\n", fps_num, fps_den);
00111         return AVERROR(EIO);
00112     }
00113     avpriv_set_pts_info(vst, 64, fps_den, fps_num);
00114 
00115     vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00116     vst->codec->codec_id   = CODEC_ID_BINKVIDEO;
00117     vst->codec->extradata  = av_mallocz(4 + FF_INPUT_BUFFER_PADDING_SIZE);
00118     vst->codec->extradata_size = 4;
00119     avio_read(pb, vst->codec->extradata, 4);
00120 
00121     bink->num_audio_tracks = avio_rl32(pb);
00122 
00123     if (bink->num_audio_tracks > BINK_MAX_AUDIO_TRACKS) {
00124         av_log(s, AV_LOG_ERROR,
00125                "invalid header: more than "AV_STRINGIFY(BINK_MAX_AUDIO_TRACKS)" audio tracks (%d)\n",
00126                bink->num_audio_tracks);
00127         return AVERROR(EIO);
00128     }
00129 
00130     if (bink->num_audio_tracks) {
00131         avio_skip(pb, 4 * bink->num_audio_tracks);
00132 
00133         for (i = 0; i < bink->num_audio_tracks; i++) {
00134             ast = avformat_new_stream(s, NULL);
00135             if (!ast)
00136                 return AVERROR(ENOMEM);
00137             ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
00138             ast->codec->codec_tag   = 0;
00139             ast->codec->sample_rate = avio_rl16(pb);
00140             avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
00141             flags = avio_rl16(pb);
00142             ast->codec->codec_id = flags & BINK_AUD_USEDCT ?
00143                                    CODEC_ID_BINKAUDIO_DCT : CODEC_ID_BINKAUDIO_RDFT;
00144             ast->codec->channels = flags & BINK_AUD_STEREO ? 2 : 1;
00145             ast->codec->extradata = av_mallocz(4 + FF_INPUT_BUFFER_PADDING_SIZE);
00146             if (!ast->codec->extradata)
00147                 return AVERROR(ENOMEM);
00148             ast->codec->extradata_size = 4;
00149             AV_WL32(ast->codec->extradata, vst->codec->codec_tag);
00150         }
00151 
00152         for (i = 0; i < bink->num_audio_tracks; i++)
00153             s->streams[i + 1]->id = avio_rl32(pb);
00154     }
00155 
00156     /* frame index table */
00157     next_pos = avio_rl32(pb);
00158     for (i = 0; i < vst->duration; i++) {
00159         pos = next_pos;
00160         if (i == vst->duration - 1) {
00161             next_pos = bink->file_size;
00162             keyframe = 0;
00163         } else {
00164             next_pos = avio_rl32(pb);
00165             keyframe = pos & 1;
00166         }
00167         pos &= ~1;
00168         next_pos &= ~1;
00169 
00170         if (next_pos <= pos) {
00171             av_log(s, AV_LOG_ERROR, "invalid frame index table\n");
00172             return AVERROR(EIO);
00173         }
00174         av_add_index_entry(vst, pos, i, next_pos - pos, 0,
00175                            keyframe ? AVINDEX_KEYFRAME : 0);
00176     }
00177 
00178     avio_skip(pb, 4);
00179 
00180     bink->current_track = -1;
00181     return 0;
00182 }
00183 
00184 static int read_packet(AVFormatContext *s, AVPacket *pkt)
00185 {
00186     BinkDemuxContext *bink = s->priv_data;
00187     AVIOContext *pb = s->pb;
00188     int ret;
00189 
00190     if (bink->current_track < 0) {
00191         int index_entry;
00192         AVStream *st = s->streams[0]; // stream 0 is video stream with index
00193 
00194         if (bink->video_pts >= st->duration)
00195             return AVERROR(EIO);
00196 
00197         index_entry = av_index_search_timestamp(st, bink->video_pts,
00198                                                 AVSEEK_FLAG_ANY);
00199         if (index_entry < 0) {
00200             av_log(s, AV_LOG_ERROR,
00201                    "could not find index entry for frame %"PRId64"\n",
00202                    bink->video_pts);
00203             return AVERROR(EIO);
00204         }
00205 
00206         bink->remain_packet_size = st->index_entries[index_entry].size;
00207         bink->current_track = 0;
00208     }
00209 
00210     while (bink->current_track < bink->num_audio_tracks) {
00211         uint32_t audio_size = avio_rl32(pb);
00212         if (audio_size > bink->remain_packet_size - 4) {
00213             av_log(s, AV_LOG_ERROR,
00214                    "frame %"PRId64": audio size in header (%u) > size of packet left (%u)\n",
00215                    bink->video_pts, audio_size, bink->remain_packet_size);
00216             return AVERROR(EIO);
00217         }
00218         bink->remain_packet_size -= 4 + audio_size;
00219         bink->current_track++;
00220         if (audio_size >= 4) {
00221             /* get one audio packet per track */
00222             if ((ret = av_get_packet(pb, pkt, audio_size)) < 0)
00223                 return ret;
00224             pkt->stream_index = bink->current_track;
00225             pkt->pts = bink->audio_pts[bink->current_track - 1];
00226 
00227             /* Each audio packet reports the number of decompressed samples
00228                (in bytes). We use this value to calcuate the audio PTS */
00229             if (pkt->size >= 4)
00230                 bink->audio_pts[bink->current_track -1] +=
00231                     AV_RL32(pkt->data) / (2 * s->streams[bink->current_track]->codec->channels);
00232             return 0;
00233         } else {
00234             avio_skip(pb, audio_size);
00235         }
00236     }
00237 
00238     /* get video packet */
00239     if ((ret = av_get_packet(pb, pkt, bink->remain_packet_size)) < 0)
00240         return ret;
00241     pkt->stream_index = 0;
00242     pkt->pts = bink->video_pts++;
00243     pkt->flags |= AV_PKT_FLAG_KEY;
00244 
00245     /* -1 instructs the next call to read_packet() to read the next frame */
00246     bink->current_track = -1;
00247 
00248     return 0;
00249 }
00250 
00251 static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
00252 {
00253     BinkDemuxContext *bink = s->priv_data;
00254     AVStream *vst = s->streams[0];
00255 
00256     if (!s->pb->seekable)
00257         return -1;
00258 
00259     /* seek to the first frame */
00260     avio_seek(s->pb, vst->index_entries[0].pos, SEEK_SET);
00261     bink->video_pts = 0;
00262     memset(bink->audio_pts, 0, sizeof(bink->audio_pts));
00263     bink->current_track = -1;
00264     return 0;
00265 }
00266 
00267 AVInputFormat ff_bink_demuxer = {
00268     .name           = "bink",
00269     .long_name      = NULL_IF_CONFIG_SMALL("Bink"),
00270     .priv_data_size = sizeof(BinkDemuxContext),
00271     .read_probe     = probe,
00272     .read_header    = read_header,
00273     .read_packet    = read_packet,
00274     .read_seek      = read_seek,
00275 };
Generated on Thu Jan 24 2013 17:08:50 for Libav by doxygen 1.7.1