1/* 2 * Bink demuxer 3 * Copyright (c) 2008-2010 Peter Ross (pross@xvid.org) 4 * Copyright (c) 2009 Daniel Verkamp (daniel@drv.nu) 5 * 6 * This file is part of Libav. 7 * 8 * Libav is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * Libav is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with Libav; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23/** 24 * @file 25 * Bink demuxer 26 * 27 * Technical details here: 28 * http://wiki.multimedia.cx/index.php?title=Bink_Container 29 */ 30 31#include "libavutil/intreadwrite.h" 32#include "avformat.h" 33#include "internal.h" 34 35enum BinkAudFlags { 36 BINK_AUD_16BITS = 0x4000, ///< prefer 16-bit output 37 BINK_AUD_STEREO = 0x2000, 38 BINK_AUD_USEDCT = 0x1000, 39}; 40 41#define BINK_EXTRADATA_SIZE 1 42#define BINK_MAX_AUDIO_TRACKS 256 43#define BINK_MAX_WIDTH 7680 44#define BINK_MAX_HEIGHT 4800 45 46typedef struct { 47 uint32_t file_size; 48 49 uint32_t num_audio_tracks; 50 int current_track; ///< audio track to return in next packet 51 int64_t video_pts; 52 int64_t audio_pts[BINK_MAX_AUDIO_TRACKS]; 53 54 uint32_t remain_packet_size; 55} BinkDemuxContext; 56 57static int probe(AVProbeData *p) 58{ 59 const uint8_t *b = p->buf; 60 61 if ( b[0] == 'B' && b[1] == 'I' && b[2] == 'K' && 62 (b[3] == 'b' || b[3] == 'f' || b[3] == 'g' || b[3] == 'h' || b[3] == 'i') && 63 AV_RL32(b+8) > 0 && // num_frames 64 AV_RL32(b+20) > 0 && AV_RL32(b+20) <= BINK_MAX_WIDTH && 65 AV_RL32(b+24) > 0 && AV_RL32(b+24) <= BINK_MAX_HEIGHT && 66 AV_RL32(b+28) > 0 && AV_RL32(b+32) > 0) // fps num,den 67 return AVPROBE_SCORE_MAX; 68 return 0; 69} 70 71static int read_header(AVFormatContext *s, AVFormatParameters *ap) 72{ 73 BinkDemuxContext *bink = s->priv_data; 74 AVIOContext *pb = s->pb; 75 uint32_t fps_num, fps_den; 76 AVStream *vst, *ast; 77 unsigned int i; 78 uint32_t pos, next_pos; 79 uint16_t flags; 80 int keyframe; 81 82 vst = avformat_new_stream(s, NULL); 83 if (!vst) 84 return AVERROR(ENOMEM); 85 86 vst->codec->codec_tag = avio_rl32(pb); 87 88 bink->file_size = avio_rl32(pb) + 8; 89 vst->duration = avio_rl32(pb); 90 91 if (vst->duration > 1000000) { 92 av_log(s, AV_LOG_ERROR, "invalid header: more than 1000000 frames\n"); 93 return AVERROR(EIO); 94 } 95 96 if (avio_rl32(pb) > bink->file_size) { 97 av_log(s, AV_LOG_ERROR, 98 "invalid header: largest frame size greater than file size\n"); 99 return AVERROR(EIO); 100 } 101 102 avio_skip(pb, 4); 103 104 vst->codec->width = avio_rl32(pb); 105 vst->codec->height = avio_rl32(pb); 106 107 fps_num = avio_rl32(pb); 108 fps_den = avio_rl32(pb); 109 if (fps_num == 0 || fps_den == 0) { 110 av_log(s, AV_LOG_ERROR, "invalid header: invalid fps (%d/%d)\n", fps_num, fps_den); 111 return AVERROR(EIO); 112 } 113 avpriv_set_pts_info(vst, 64, fps_den, fps_num); 114 115 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; 116 vst->codec->codec_id = CODEC_ID_BINKVIDEO; 117 vst->codec->extradata = av_mallocz(4 + FF_INPUT_BUFFER_PADDING_SIZE); 118 vst->codec->extradata_size = 4; 119 avio_read(pb, vst->codec->extradata, 4); 120 121 bink->num_audio_tracks = avio_rl32(pb); 122 123 if (bink->num_audio_tracks > BINK_MAX_AUDIO_TRACKS) { 124 av_log(s, AV_LOG_ERROR, 125 "invalid header: more than "AV_STRINGIFY(BINK_MAX_AUDIO_TRACKS)" audio tracks (%d)\n", 126 bink->num_audio_tracks); 127 return AVERROR(EIO); 128 } 129 130 if (bink->num_audio_tracks) { 131 avio_skip(pb, 4 * bink->num_audio_tracks); 132 133 for (i = 0; i < bink->num_audio_tracks; i++) { 134 ast = avformat_new_stream(s, NULL); 135 if (!ast) 136 return AVERROR(ENOMEM); 137 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; 138 ast->codec->codec_tag = 0; 139 ast->codec->sample_rate = avio_rl16(pb); 140 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); 141 flags = avio_rl16(pb); 142 ast->codec->codec_id = flags & BINK_AUD_USEDCT ? 143 CODEC_ID_BINKAUDIO_DCT : CODEC_ID_BINKAUDIO_RDFT; 144 ast->codec->channels = flags & BINK_AUD_STEREO ? 2 : 1; 145 ast->codec->extradata = av_mallocz(4 + FF_INPUT_BUFFER_PADDING_SIZE); 146 if (!ast->codec->extradata) 147 return AVERROR(ENOMEM); 148 ast->codec->extradata_size = 4; 149 AV_WL32(ast->codec->extradata, vst->codec->codec_tag); 150 } 151 152 for (i = 0; i < bink->num_audio_tracks; i++) 153 s->streams[i + 1]->id = avio_rl32(pb); 154 } 155 156 /* frame index table */ 157 next_pos = avio_rl32(pb); 158 for (i = 0; i < vst->duration; i++) { 159 pos = next_pos; 160 if (i == vst->duration - 1) { 161 next_pos = bink->file_size; 162 keyframe = 0; 163 } else { 164 next_pos = avio_rl32(pb); 165 keyframe = pos & 1; 166 } 167 pos &= ~1; 168 next_pos &= ~1; 169 170 if (next_pos <= pos) { 171 av_log(s, AV_LOG_ERROR, "invalid frame index table\n"); 172 return AVERROR(EIO); 173 } 174 av_add_index_entry(vst, pos, i, next_pos - pos, 0, 175 keyframe ? AVINDEX_KEYFRAME : 0); 176 } 177 178 avio_skip(pb, 4); 179 180 bink->current_track = -1; 181 return 0; 182} 183 184static int read_packet(AVFormatContext *s, AVPacket *pkt) 185{ 186 BinkDemuxContext *bink = s->priv_data; 187 AVIOContext *pb = s->pb; 188 int ret; 189 190 if (bink->current_track < 0) { 191 int index_entry; 192 AVStream *st = s->streams[0]; // stream 0 is video stream with index 193 194 if (bink->video_pts >= st->duration) 195 return AVERROR(EIO); 196 197 index_entry = av_index_search_timestamp(st, bink->video_pts, 198 AVSEEK_FLAG_ANY); 199 if (index_entry < 0) { 200 av_log(s, AV_LOG_ERROR, 201 "could not find index entry for frame %"PRId64"\n", 202 bink->video_pts); 203 return AVERROR(EIO); 204 } 205 206 bink->remain_packet_size = st->index_entries[index_entry].size; 207 bink->current_track = 0; 208 } 209 210 while (bink->current_track < bink->num_audio_tracks) { 211 uint32_t audio_size = avio_rl32(pb); 212 if (audio_size > bink->remain_packet_size - 4) { 213 av_log(s, AV_LOG_ERROR, 214 "frame %"PRId64": audio size in header (%u) > size of packet left (%u)\n", 215 bink->video_pts, audio_size, bink->remain_packet_size); 216 return AVERROR(EIO); 217 } 218 bink->remain_packet_size -= 4 + audio_size; 219 bink->current_track++; 220 if (audio_size >= 4) { 221 /* get one audio packet per track */ 222 if ((ret = av_get_packet(pb, pkt, audio_size)) < 0) 223 return ret; 224 pkt->stream_index = bink->current_track; 225 pkt->pts = bink->audio_pts[bink->current_track - 1]; 226 227 /* Each audio packet reports the number of decompressed samples 228 (in bytes). We use this value to calcuate the audio PTS */ 229 if (pkt->size >= 4) 230 bink->audio_pts[bink->current_track -1] += 231 AV_RL32(pkt->data) / (2 * s->streams[bink->current_track]->codec->channels); 232 return 0; 233 } else { 234 avio_skip(pb, audio_size); 235 } 236 } 237 238 /* get video packet */ 239 if ((ret = av_get_packet(pb, pkt, bink->remain_packet_size)) < 0) 240 return ret; 241 pkt->stream_index = 0; 242 pkt->pts = bink->video_pts++; 243 pkt->flags |= AV_PKT_FLAG_KEY; 244 245 /* -1 instructs the next call to read_packet() to read the next frame */ 246 bink->current_track = -1; 247 248 return 0; 249} 250 251static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) 252{ 253 BinkDemuxContext *bink = s->priv_data; 254 AVStream *vst = s->streams[0]; 255 256 if (!s->pb->seekable) 257 return -1; 258 259 /* seek to the first frame */ 260 avio_seek(s->pb, vst->index_entries[0].pos, SEEK_SET); 261 bink->video_pts = 0; 262 memset(bink->audio_pts, 0, sizeof(bink->audio_pts)); 263 bink->current_track = -1; 264 return 0; 265} 266 267AVInputFormat ff_bink_demuxer = { 268 .name = "bink", 269 .long_name = NULL_IF_CONFIG_SMALL("Bink"), 270 .priv_data_size = sizeof(BinkDemuxContext), 271 .read_probe = probe, 272 .read_header = read_header, 273 .read_packet = read_packet, 274 .read_seek = read_seek, 275}; 276