• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 
31 #include <inttypes.h>
32 
33 #include "libavutil/channel_layout.h"
34 #include "libavutil/intreadwrite.h"
35 #include "avformat.h"
36 #include "demux.h"
37 #include "internal.h"
38 
39 enum BinkAudFlags {
40     BINK_AUD_16BITS = 0x4000, ///< prefer 16-bit output
41     BINK_AUD_STEREO = 0x2000,
42     BINK_AUD_USEDCT = 0x1000,
43 };
44 
45 #define BINK_EXTRADATA_SIZE     1
46 #define BINK_MAX_AUDIO_TRACKS   256
47 #define BINK_MAX_WIDTH          7680
48 #define BINK_MAX_HEIGHT         4800
49 #define SMUSH_BLOCK_SIZE        512
50 
51 typedef struct BinkDemuxContext {
52     uint32_t file_size;
53 
54     uint32_t num_audio_tracks;
55     int current_track;      ///< audio track to return in next packet
56     int64_t video_pts;
57     int64_t audio_pts[BINK_MAX_AUDIO_TRACKS];
58 
59     uint32_t remain_packet_size;
60     int flags;
61     int smush_size;
62 } BinkDemuxContext;
63 
probe(const AVProbeData * p)64 static int probe(const AVProbeData *p)
65 {
66     const uint8_t *b = p->buf;
67     int smush = AV_RN32(p->buf) == AV_RN32("SMUS");
68 
69     do {
70         if (((b[0] == 'B' && b[1] == 'I' && b[2] == 'K' && /* Bink 1 */
71              (b[3] == 'b' || b[3] == 'f' || b[3] == 'g' || b[3] == 'h' || b[3] == 'i' ||
72               b[3] == 'k')) ||
73              (b[0] == 'K' && b[1] == 'B' && b[2] == '2' && /* Bink 2 */
74              (b[3] == 'a' || b[3] == 'd' || b[3] == 'f' || b[3] == 'g' || b[3] == 'h' ||
75               b[3] == 'i' || b[3] == 'j' || b[3] == 'k'))) &&
76             AV_RL32(b+8) > 0 &&  // num_frames
77             AV_RL32(b+20) > 0 && AV_RL32(b+20) <= BINK_MAX_WIDTH &&
78             AV_RL32(b+24) > 0 && AV_RL32(b+24) <= BINK_MAX_HEIGHT &&
79             AV_RL32(b+28) > 0 && AV_RL32(b+32) > 0)  // fps num,den
80             return AVPROBE_SCORE_MAX;
81         b += SMUSH_BLOCK_SIZE;
82     } while (smush && b < p->buf + p->buf_size - 32);
83     return 0;
84 }
85 
read_header(AVFormatContext * s)86 static int read_header(AVFormatContext *s)
87 {
88     BinkDemuxContext *bink = s->priv_data;
89     AVIOContext *pb = s->pb;
90     uint32_t fps_num, fps_den;
91     AVStream *const vst  = avformat_new_stream(s, NULL);
92     FFStream *const vsti = ffstream(vst);
93     unsigned int i;
94     uint32_t pos, next_pos;
95     uint16_t flags;
96     int next_keyframe = 1;
97     int keyframe;
98     int ret;
99     uint32_t signature;
100     uint8_t revision;
101 
102     if (!vst)
103         return AVERROR(ENOMEM);
104 
105     vst->codecpar->codec_tag = avio_rl32(pb);
106     if (vst->codecpar->codec_tag == AV_RL32("SMUS")) {
107         do {
108             bink->smush_size += SMUSH_BLOCK_SIZE;
109             avio_skip(pb, SMUSH_BLOCK_SIZE - 4);
110             vst->codecpar->codec_tag = avio_rl32(pb);
111         } while (!avio_feof(pb) && (vst->codecpar->codec_tag & 0xFFFFFF) != AV_RL32("BIK"));
112         if (avio_feof(pb)) {
113             av_log(s, AV_LOG_ERROR, "invalid SMUSH header: BIK not found\n");
114             return AVERROR_INVALIDDATA;
115         }
116     }
117 
118     bink->file_size = avio_rl32(pb) + 8;
119     vst->duration   = avio_rl32(pb);
120 
121     if (vst->duration > 1000000) {
122         av_log(s, AV_LOG_ERROR, "invalid header: more than 1000000 frames\n");
123         return AVERROR(EIO);
124     }
125 
126     if (avio_rl32(pb) > bink->file_size) {
127         av_log(s, AV_LOG_ERROR,
128                "invalid header: largest frame size greater than file size\n");
129         return AVERROR(EIO);
130     }
131 
132     avio_skip(pb, 4);
133 
134     vst->codecpar->width  = avio_rl32(pb);
135     vst->codecpar->height = avio_rl32(pb);
136 
137     fps_num = avio_rl32(pb);
138     fps_den = avio_rl32(pb);
139     if (fps_num == 0 || fps_den == 0) {
140         av_log(s, AV_LOG_ERROR,
141                "invalid header: invalid fps (%"PRIu32"/%"PRIu32")\n",
142                fps_num, fps_den);
143         return AVERROR(EIO);
144     }
145     avpriv_set_pts_info(vst, 64, fps_den, fps_num);
146     vst->avg_frame_rate = av_inv_q(vst->time_base);
147 
148     vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
149     vst->codecpar->codec_id   = AV_CODEC_ID_BINKVIDEO;
150 
151     if ((vst->codecpar->codec_tag & 0xFFFFFF) == MKTAG('K', 'B', '2', 0)) {
152         av_log(s, AV_LOG_WARNING, "Bink 2 video is not implemented\n");
153         vst->codecpar->codec_id = AV_CODEC_ID_NONE;
154     }
155 
156     if ((ret = ff_get_extradata(s, vst->codecpar, pb, 4)) < 0)
157         return ret;
158 
159     bink->num_audio_tracks = avio_rl32(pb);
160 
161     if (bink->num_audio_tracks > BINK_MAX_AUDIO_TRACKS) {
162         av_log(s, AV_LOG_ERROR,
163                "invalid header: more than "AV_STRINGIFY(BINK_MAX_AUDIO_TRACKS)" audio tracks (%"PRIu32")\n",
164                bink->num_audio_tracks);
165         return AVERROR(EIO);
166     }
167 
168     signature = (vst->codecpar->codec_tag & 0xFFFFFF);
169     revision = ((vst->codecpar->codec_tag >> 24) % 0xFF);
170 
171     if ((signature == AV_RL32("BIK") && (revision == 'k')) ||
172         (signature == AV_RL32("KB2") && (revision == 'i' || revision == 'j' || revision == 'k')))
173         avio_skip(pb, 4); /* unknown new field */
174 
175     if (bink->num_audio_tracks) {
176         avio_skip(pb, 4 * bink->num_audio_tracks); /* max decoded size */
177 
178         for (i = 0; i < bink->num_audio_tracks; i++) {
179             AVStream *const ast = avformat_new_stream(s, NULL);
180             if (!ast)
181                 return AVERROR(ENOMEM);
182             ast->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
183             ast->codecpar->codec_tag   = 0;
184             ast->codecpar->sample_rate = avio_rl16(pb);
185             avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
186             flags = avio_rl16(pb);
187             ast->codecpar->codec_id = flags & BINK_AUD_USEDCT ?
188                                    AV_CODEC_ID_BINKAUDIO_DCT : AV_CODEC_ID_BINKAUDIO_RDFT;
189             if (flags & BINK_AUD_STEREO) {
190                 ast->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
191             } else {
192                 ast->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
193             }
194             if ((ret = ff_alloc_extradata(ast->codecpar, 4)) < 0)
195                 return ret;
196             AV_WL32(ast->codecpar->extradata, vst->codecpar->codec_tag);
197         }
198 
199         for (i = 0; i < bink->num_audio_tracks; i++)
200             s->streams[i + 1]->id = avio_rl32(pb);
201     }
202 
203     /* frame index table */
204     next_pos = avio_rl32(pb);
205     for (i = 0; i < vst->duration; i++) {
206         pos = next_pos;
207         keyframe = next_keyframe;
208         if (i == vst->duration - 1) {
209             next_pos = bink->file_size;
210             next_keyframe = 0;
211         } else {
212             next_pos = avio_rl32(pb);
213             next_keyframe = next_pos & 1;
214         }
215         pos &= ~1;
216         next_pos &= ~1;
217 
218         if (next_pos <= pos) {
219             av_log(s, AV_LOG_ERROR, "invalid frame index table\n");
220             return AVERROR(EIO);
221         }
222         if ((ret = av_add_index_entry(vst, pos, i, next_pos - pos, 0,
223                                       keyframe ? AVINDEX_KEYFRAME : 0)) < 0)
224             return ret;
225     }
226 
227     if (vsti->index_entries)
228         avio_seek(pb, vsti->index_entries[0].pos + bink->smush_size, SEEK_SET);
229     else
230         avio_skip(pb, 4);
231 
232     bink->current_track = -1;
233     return 0;
234 }
235 
read_packet(AVFormatContext * s,AVPacket * pkt)236 static int read_packet(AVFormatContext *s, AVPacket *pkt)
237 {
238     BinkDemuxContext *bink = s->priv_data;
239     AVIOContext *pb = s->pb;
240     int ret;
241 
242     if (bink->current_track < 0) {
243         int index_entry;
244         AVStream *st = s->streams[0]; // stream 0 is video stream with index
245         FFStream *const sti = ffstream(st);
246 
247         if (bink->video_pts >= st->duration)
248             return AVERROR_EOF;
249 
250         index_entry = av_index_search_timestamp(st, bink->video_pts,
251                                                 AVSEEK_FLAG_ANY);
252         if (index_entry < 0) {
253             av_log(s, AV_LOG_ERROR,
254                    "could not find index entry for frame %"PRId64"\n",
255                    bink->video_pts);
256             return AVERROR(EIO);
257         }
258 
259         bink->remain_packet_size = sti->index_entries[index_entry].size;
260         bink->flags              = sti->index_entries[index_entry].flags;
261         bink->current_track = 0;
262     }
263 
264     while (bink->current_track < bink->num_audio_tracks) {
265         uint32_t audio_size = avio_rl32(pb);
266         if (audio_size > bink->remain_packet_size - 4) {
267             av_log(s, AV_LOG_ERROR,
268                    "frame %"PRId64": audio size in header (%"PRIu32") > size of packet left (%"PRIu32")\n",
269                    bink->video_pts, audio_size, bink->remain_packet_size);
270             return AVERROR(EIO);
271         }
272         bink->remain_packet_size -= 4 + audio_size;
273         bink->current_track++;
274         if (audio_size >= 4) {
275             /* get one audio packet per track */
276             if ((ret = av_get_packet(pb, pkt, audio_size)) < 0)
277                 return ret;
278             pkt->stream_index = bink->current_track;
279             pkt->pts = bink->audio_pts[bink->current_track - 1];
280 
281             /* Each audio packet reports the number of decompressed samples
282                (in bytes). We use this value to calculate the audio PTS */
283             if (pkt->size >= 4)
284                 bink->audio_pts[bink->current_track -1] +=
285                     AV_RL32(pkt->data) / (2 * s->streams[bink->current_track]->codecpar->ch_layout.nb_channels);
286             return 0;
287         } else {
288             avio_skip(pb, audio_size);
289         }
290     }
291 
292     /* get video packet */
293     if ((ret = av_get_packet(pb, pkt, bink->remain_packet_size)) < 0)
294         return ret;
295     pkt->stream_index = 0;
296     pkt->pts = bink->video_pts++;
297     if (bink->flags & AVINDEX_KEYFRAME)
298         pkt->flags |= AV_PKT_FLAG_KEY;
299 
300     /* -1 instructs the next call to read_packet() to read the next frame */
301     bink->current_track = -1;
302 
303     return 0;
304 }
305 
read_seek(AVFormatContext * s,int stream_index,int64_t timestamp,int flags)306 static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
307 {
308     BinkDemuxContext *bink = s->priv_data;
309     AVStream *vst = s->streams[0];
310     FFStream *const vsti = ffstream(vst);
311     int64_t ret;
312 
313     if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
314         return -1;
315 
316     /* seek to the first frame */
317     ret = avio_seek(s->pb, vsti->index_entries[0].pos + bink->smush_size, SEEK_SET);
318     if (ret < 0)
319         return ret;
320 
321     bink->video_pts = 0;
322     memset(bink->audio_pts, 0, sizeof(bink->audio_pts));
323     bink->current_track = -1;
324     return 0;
325 }
326 
327 const AVInputFormat ff_bink_demuxer = {
328     .name           = "bink",
329     .long_name      = NULL_IF_CONFIG_SMALL("Bink"),
330     .priv_data_size = sizeof(BinkDemuxContext),
331     .read_probe     = probe,
332     .read_header    = read_header,
333     .read_packet    = read_packet,
334     .read_seek      = read_seek,
335     .flags          = AVFMT_SHOW_IDS,
336 };
337