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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 FFmpeg.
7  *
8  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 
32 #include "libavutil/intreadwrite.h"
33 #include "avformat.h"
34 #include "internal.h"
35 
37  BINK_AUD_16BITS = 0x4000, ///< prefer 16-bit output
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;
51  int current_track; ///< audio track to return in next packet
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  vst->avg_frame_rate = av_inv_q(vst->time_base);
116 
119  if (ff_alloc_extradata(vst->codec, 4))
120  return AVERROR(ENOMEM);
121  avio_read(pb, vst->codec->extradata, 4);
122 
123  bink->num_audio_tracks = avio_rl32(pb);
124 
126  av_log(s, AV_LOG_ERROR,
127  "invalid header: more than "AV_STRINGIFY(BINK_MAX_AUDIO_TRACKS)" audio tracks (%d)\n",
128  bink->num_audio_tracks);
129  return AVERROR(EIO);
130  }
131 
132  if (bink->num_audio_tracks) {
133  avio_skip(pb, 4 * bink->num_audio_tracks);
134 
135  for (i = 0; i < bink->num_audio_tracks; i++) {
136  ast = avformat_new_stream(s, NULL);
137  if (!ast)
138  return AVERROR(ENOMEM);
140  ast->codec->codec_tag = 0;
141  ast->codec->sample_rate = avio_rl16(pb);
142  avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
143  flags = avio_rl16(pb);
144  ast->codec->codec_id = flags & BINK_AUD_USEDCT ?
146  if (flags & BINK_AUD_STEREO) {
147  ast->codec->channels = 2;
149  } else {
150  ast->codec->channels = 1;
152  }
153  if (ff_alloc_extradata(ast->codec, 4))
154  return AVERROR(ENOMEM);
155  AV_WL32(ast->codec->extradata, vst->codec->codec_tag);
156  }
157 
158  for (i = 0; i < bink->num_audio_tracks; i++)
159  s->streams[i + 1]->id = avio_rl32(pb);
160  }
161 
162  /* frame index table */
163  next_pos = avio_rl32(pb);
164  for (i = 0; i < vst->duration; i++) {
165  pos = next_pos;
166  if (i == vst->duration - 1) {
167  next_pos = bink->file_size;
168  keyframe = 0;
169  } else {
170  next_pos = avio_rl32(pb);
171  keyframe = pos & 1;
172  }
173  pos &= ~1;
174  next_pos &= ~1;
175 
176  if (next_pos <= pos) {
177  av_log(s, AV_LOG_ERROR, "invalid frame index table\n");
178  return AVERROR(EIO);
179  }
180  av_add_index_entry(vst, pos, i, next_pos - pos, 0,
181  keyframe ? AVINDEX_KEYFRAME : 0);
182  }
183 
184  avio_skip(pb, 4);
185 
186  bink->current_track = -1;
187  return 0;
188 }
189 
191 {
192  BinkDemuxContext *bink = s->priv_data;
193  AVIOContext *pb = s->pb;
194  int ret;
195 
196  if (bink->current_track < 0) {
197  int index_entry;
198  AVStream *st = s->streams[0]; // stream 0 is video stream with index
199 
200  if (bink->video_pts >= st->duration)
201  return AVERROR_EOF;
202 
203  index_entry = av_index_search_timestamp(st, bink->video_pts,
205  if (index_entry < 0) {
206  av_log(s, AV_LOG_ERROR,
207  "could not find index entry for frame %"PRId64"\n",
208  bink->video_pts);
209  return AVERROR(EIO);
210  }
211 
212  bink->remain_packet_size = st->index_entries[index_entry].size;
213  bink->current_track = 0;
214  }
215 
216  while (bink->current_track < bink->num_audio_tracks) {
217  uint32_t audio_size = avio_rl32(pb);
218  if (audio_size > bink->remain_packet_size - 4) {
219  av_log(s, AV_LOG_ERROR,
220  "frame %"PRId64": audio size in header (%u) > size of packet left (%u)\n",
221  bink->video_pts, audio_size, bink->remain_packet_size);
222  return AVERROR(EIO);
223  }
224  bink->remain_packet_size -= 4 + audio_size;
225  bink->current_track++;
226  if (audio_size >= 4) {
227  /* get one audio packet per track */
228  if ((ret = av_get_packet(pb, pkt, audio_size)) < 0)
229  return ret;
230  pkt->stream_index = bink->current_track;
231  pkt->pts = bink->audio_pts[bink->current_track - 1];
232 
233  /* Each audio packet reports the number of decompressed samples
234  (in bytes). We use this value to calcuate the audio PTS */
235  if (pkt->size >= 4)
236  bink->audio_pts[bink->current_track -1] +=
237  AV_RL32(pkt->data) / (2 * s->streams[bink->current_track]->codec->channels);
238  return 0;
239  } else {
240  avio_skip(pb, audio_size);
241  }
242  }
243 
244  /* get video packet */
245  if ((ret = av_get_packet(pb, pkt, bink->remain_packet_size)) < 0)
246  return ret;
247  pkt->stream_index = 0;
248  pkt->pts = bink->video_pts++;
249  pkt->flags |= AV_PKT_FLAG_KEY;
250 
251  /* -1 instructs the next call to read_packet() to read the next frame */
252  bink->current_track = -1;
253 
254  return 0;
255 }
256 
257 static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
258 {
259  BinkDemuxContext *bink = s->priv_data;
260  AVStream *vst = s->streams[0];
261 
262  if (!s->pb->seekable)
263  return -1;
264 
265  /* seek to the first frame */
266  if (avio_seek(s->pb, vst->index_entries[0].pos, SEEK_SET) < 0)
267  return -1;
268 
269  bink->video_pts = 0;
270  memset(bink->audio_pts, 0, sizeof(bink->audio_pts));
271  bink->current_track = -1;
272  return 0;
273 }
274 
276  .name = "bink",
277  .long_name = NULL_IF_CONFIG_SMALL("Bink"),
278  .priv_data_size = sizeof(BinkDemuxContext),
279  .read_probe = probe,
282  .read_seek = read_seek,
283 };