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 
32 #include "libavutil/intreadwrite.h"
33 #include "avformat.h"
34 #include "internal.h"
35 
37  BINK_AUD_16BITS = 0x4000,
38  BINK_AUD_STEREO = 0x2000,
39  BINK_AUD_USEDCT = 0x1000,
40 };
41 
42 #define BINK_EXTRADATA_SIZE 1
43 #define BINK_MAX_AUDIO_TRACKS 256
44 #define BINK_MAX_WIDTH 7680
45 #define BINK_MAX_HEIGHT 4800
46 
47 typedef struct {
48  uint32_t file_size;
49 
50  uint32_t num_audio_tracks;
52  int64_t video_pts;
53  int64_t audio_pts[BINK_MAX_AUDIO_TRACKS];
54 
57 
58 static int probe(AVProbeData *p)
59 {
60  const uint8_t *b = p->buf;
61 
62  if ( b[0] == 'B' && b[1] == 'I' && b[2] == 'K' &&
63  (b[3] == 'b' || b[3] == 'f' || b[3] == 'g' || b[3] == 'h' || b[3] == 'i') &&
64  AV_RL32(b+8) > 0 && // num_frames
65  AV_RL32(b+20) > 0 && AV_RL32(b+20) <= BINK_MAX_WIDTH &&
66  AV_RL32(b+24) > 0 && AV_RL32(b+24) <= BINK_MAX_HEIGHT &&
67  AV_RL32(b+28) > 0 && AV_RL32(b+32) > 0) // fps num,den
68  return AVPROBE_SCORE_MAX;
69  return 0;
70 }
71 
73 {
74  BinkDemuxContext *bink = s->priv_data;
75  AVIOContext *pb = s->pb;
76  uint32_t fps_num, fps_den;
77  AVStream *vst, *ast;
78  unsigned int i;
79  uint32_t pos, next_pos;
80  uint16_t flags;
81  int keyframe;
82 
83  vst = avformat_new_stream(s, NULL);
84  if (!vst)
85  return AVERROR(ENOMEM);
86 
87  vst->codec->codec_tag = avio_rl32(pb);
88 
89  bink->file_size = avio_rl32(pb) + 8;
90  vst->duration = avio_rl32(pb);
91 
92  if (vst->duration > 1000000) {
93  av_log(s, AV_LOG_ERROR, "invalid header: more than 1000000 frames\n");
94  return AVERROR(EIO);
95  }
96 
97  if (avio_rl32(pb) > bink->file_size) {
99  "invalid header: largest frame size greater than file size\n");
100  return AVERROR(EIO);
101  }
102 
103  avio_skip(pb, 4);
104 
105  vst->codec->width = avio_rl32(pb);
106  vst->codec->height = avio_rl32(pb);
107 
108  fps_num = avio_rl32(pb);
109  fps_den = avio_rl32(pb);
110  if (fps_num == 0 || fps_den == 0) {
111  av_log(s, AV_LOG_ERROR, "invalid header: invalid fps (%d/%d)\n", fps_num, fps_den);
112  return AVERROR(EIO);
113  }
114  avpriv_set_pts_info(vst, 64, fps_den, fps_num);
115 
119  vst->codec->extradata_size = 4;
120  avio_read(pb, vst->codec->extradata, 4);
121 
122  bink->num_audio_tracks = avio_rl32(pb);
123 
125  av_log(s, AV_LOG_ERROR,
126  "invalid header: more than "AV_STRINGIFY(BINK_MAX_AUDIO_TRACKS)" audio tracks (%d)\n",
127  bink->num_audio_tracks);
128  return AVERROR(EIO);
129  }
130 
131  if (bink->num_audio_tracks) {
132  avio_skip(pb, 4 * bink->num_audio_tracks);
133 
134  for (i = 0; i < bink->num_audio_tracks; i++) {
135  ast = avformat_new_stream(s, NULL);
136  if (!ast)
137  return AVERROR(ENOMEM);
139  ast->codec->codec_tag = 0;
140  ast->codec->sample_rate = avio_rl16(pb);
141  avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
142  flags = avio_rl16(pb);
143  ast->codec->codec_id = flags & BINK_AUD_USEDCT ?
145  if (flags & BINK_AUD_STEREO) {
146  ast->codec->channels = 2;
148  } else {
149  ast->codec->channels = 1;
151  }
153  if (!ast->codec->extradata)
154  return AVERROR(ENOMEM);
155  ast->codec->extradata_size = 4;
156  AV_WL32(ast->codec->extradata, vst->codec->codec_tag);
157  }
158 
159  for (i = 0; i < bink->num_audio_tracks; i++)
160  s->streams[i + 1]->id = avio_rl32(pb);
161  }
162 
163  /* frame index table */
164  next_pos = avio_rl32(pb);
165  for (i = 0; i < vst->duration; i++) {
166  pos = next_pos;
167  if (i == vst->duration - 1) {
168  next_pos = bink->file_size;
169  keyframe = 0;
170  } else {
171  next_pos = avio_rl32(pb);
172  keyframe = pos & 1;
173  }
174  pos &= ~1;
175  next_pos &= ~1;
176 
177  if (next_pos <= pos) {
178  av_log(s, AV_LOG_ERROR, "invalid frame index table\n");
179  return AVERROR(EIO);
180  }
181  av_add_index_entry(vst, pos, i, next_pos - pos, 0,
182  keyframe ? AVINDEX_KEYFRAME : 0);
183  }
184 
185  avio_skip(pb, 4);
186 
187  bink->current_track = -1;
188  return 0;
189 }
190 
192 {
193  BinkDemuxContext *bink = s->priv_data;
194  AVIOContext *pb = s->pb;
195  int ret;
196 
197  if (bink->current_track < 0) {
198  int index_entry;
199  AVStream *st = s->streams[0]; // stream 0 is video stream with index
200 
201  if (bink->video_pts >= st->duration)
202  return AVERROR(EIO);
203 
204  index_entry = av_index_search_timestamp(st, bink->video_pts,
206  if (index_entry < 0) {
207  av_log(s, AV_LOG_ERROR,
208  "could not find index entry for frame %"PRId64"\n",
209  bink->video_pts);
210  return AVERROR(EIO);
211  }
212 
213  bink->remain_packet_size = st->index_entries[index_entry].size;
214  bink->current_track = 0;
215  }
216 
217  while (bink->current_track < bink->num_audio_tracks) {
218  uint32_t audio_size = avio_rl32(pb);
219  if (audio_size > bink->remain_packet_size - 4) {
220  av_log(s, AV_LOG_ERROR,
221  "frame %"PRId64": audio size in header (%u) > size of packet left (%u)\n",
222  bink->video_pts, audio_size, bink->remain_packet_size);
223  return AVERROR(EIO);
224  }
225  bink->remain_packet_size -= 4 + audio_size;
226  bink->current_track++;
227  if (audio_size >= 4) {
228  /* get one audio packet per track */
229  if ((ret = av_get_packet(pb, pkt, audio_size)) < 0)
230  return ret;
231  pkt->stream_index = bink->current_track;
232  pkt->pts = bink->audio_pts[bink->current_track - 1];
233 
234  /* Each audio packet reports the number of decompressed samples
235  (in bytes). We use this value to calcuate the audio PTS */
236  if (pkt->size >= 4)
237  bink->audio_pts[bink->current_track -1] +=
238  AV_RL32(pkt->data) / (2 * s->streams[bink->current_track]->codec->channels);
239  return 0;
240  } else {
241  avio_skip(pb, audio_size);
242  }
243  }
244 
245  /* get video packet */
246  if ((ret = av_get_packet(pb, pkt, bink->remain_packet_size)) < 0)
247  return ret;
248  pkt->stream_index = 0;
249  pkt->pts = bink->video_pts++;
250  pkt->flags |= AV_PKT_FLAG_KEY;
251 
252  /* -1 instructs the next call to read_packet() to read the next frame */
253  bink->current_track = -1;
254 
255  return 0;
256 }
257 
258 static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
259 {
260  BinkDemuxContext *bink = s->priv_data;
261  AVStream *vst = s->streams[0];
262 
263  if (!s->pb->seekable)
264  return -1;
265 
266  /* seek to the first frame */
267  if (avio_seek(s->pb, vst->index_entries[0].pos, SEEK_SET) < 0)
268  return -1;
269 
270  bink->video_pts = 0;
271  memset(bink->audio_pts, 0, sizeof(bink->audio_pts));
272  bink->current_track = -1;
273  return 0;
274 }
275 
277  .name = "bink",
278  .long_name = NULL_IF_CONFIG_SMALL("Bink"),
279  .priv_data_size = sizeof(BinkDemuxContext),
280  .read_probe = probe,
283  .read_seek = read_seek,
284 };