bink.c
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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 
31 #include "libavutil/intreadwrite.h"
32 #include "avformat.h"
33 #include "internal.h"
34 
36  BINK_AUD_16BITS = 0x4000,
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 
46 typedef struct {
47  uint32_t file_size;
48 
49  uint32_t num_audio_tracks;
51  int64_t video_pts;
52  int64_t audio_pts[BINK_MAX_AUDIO_TRACKS];
53 
56 
57 static 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 
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) {
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 
118  vst->codec->extradata_size = 4;
119  avio_read(pb, vst->codec->extradata, 4);
120 
121  bink->num_audio_tracks = avio_rl32(pb);
122 
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);
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 ?
144  ast->codec->channels = flags & BINK_AUD_STEREO ? 2 : 1;
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 
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,
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 
251 static 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 
268  .name = "bink",
269  .long_name = NULL_IF_CONFIG_SMALL("Bink"),
270  .priv_data_size = sizeof(BinkDemuxContext),
271  .read_probe = probe,
274  .read_seek = read_seek,
275 };