FFmpeg
moflex.c
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1 /*
2  * MOFLEX demuxer
3  * Copyright (c) 2015-2016 Florian Nouwt
4  * Copyright (c) 2017 Adib Surani
5  * Copyright (c) 2020 Paul B Mahol
6  *
7  * This file is part of FFmpeg.
8  *
9  * FFmpeg is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * FFmpeg is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with FFmpeg; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
24 #include "libavcodec/bytestream.h"
25 
26 #include "avformat.h"
27 #include "internal.h"
28 
29 typedef struct BitReader {
30  unsigned last;
31  unsigned pos;
32 } BitReader;
33 
34 typedef struct MOFLEXDemuxContext {
35  unsigned size;
36  int64_t pos;
37  int64_t ts;
38  int flags;
39  int in_block;
40 
43 
44 static int pop(BitReader *br, AVIOContext *pb)
45 {
46  if (avio_feof(pb))
47  return AVERROR_EOF;
48 
49  if ((br->pos & 7) == 0)
50  br->last = (unsigned)avio_r8(pb) << 24U;
51  else
52  br->last <<= 1;
53 
54  br->pos++;
55  return !!(br->last & 0x80000000);
56 }
57 
58 static int pop_int(BitReader *br, AVIOContext *pb, int n)
59 {
60  int value = 0;
61 
62  for (int i = 0; i < n; i++) {
63  int ret = pop(br, pb);
64 
65  if (ret < 0)
66  return ret;
67  if (ret > INT_MAX - value - value)
68  return AVERROR_INVALIDDATA;
69  value = 2 * value + ret;
70  }
71 
72  return value;
73 }
74 
75 static int pop_length(BitReader *br, AVIOContext *pb)
76 {
77  int ret, n = 1;
78 
79  while ((ret = pop(br, pb)) == 0)
80  n++;
81 
82  if (ret < 0)
83  return ret;
84  return n;
85 }
86 
87 static int read_var_byte(AVFormatContext *s, unsigned *out)
88 {
89  AVIOContext *pb = s->pb;
90  unsigned value = 0, data;
91 
92  data = avio_r8(pb);
93  if (!(data & 0x80)) {
94  *out = data;
95  return 0;
96  }
97 
98  value = (data & 0x7F) << 7;
99  data = avio_r8(pb);
100  if (!(data & 0x80)) {
101  value |= data;
102  *out = value;
103  return 0;
104  }
105 
106  value = ((data & 0x7F) | value) << 7;
107  data = avio_r8(pb);
108  if (!(data & 0x80)) {
109  value |= data;
110  *out = value;
111  return 0;
112  }
113 
114  value = (((data & 0x7F) | value) << 7) | avio_r8(pb);
115  *out = value;
116 
117  return 0;
118 }
119 
120 static int moflex_probe(const AVProbeData *p)
121 {
122  GetByteContext gb;
123  int score = 0;
124 
125  bytestream2_init(&gb, p->buf, p->buf_size);
126 
127  if (bytestream2_get_be16(&gb) != 0x4C32)
128  return 0;
129  score += 10;
130 
131  bytestream2_skip(&gb, 10);
132  if (bytestream2_get_be16(&gb) == 0)
133  return 0;
134  score += 5;
135 
136  while (bytestream2_get_bytes_left(&gb) > 0) {
137  int type = bytestream2_get_byte(&gb);
138  int size = bytestream2_get_byte(&gb);
139 
140  if (type == 0) {
141  score += 5 * (size == 0);
142  break;
143  }
144  if ((type == 1 && size == 12) ||
145  (type == 2 && size == 6) ||
146  (type == 3 && size == 13) ||
147  (type == 4 && size == 2))
148  score += 20;
149  bytestream2_skip(&gb, size);
150  }
151 
152  return FFMIN(AVPROBE_SCORE_MAX, score);
153 }
154 
156 {
158  AVIOContext *pb = s->pb;
159 
160  if (avio_rb16(pb) != 0x4C32) {
161  if (avio_feof(pb))
162  return AVERROR_EOF;
163  avio_seek(pb, -2, SEEK_CUR);
164  return 1;
165  }
166 
167  avio_skip(pb, 2);
168  m->ts = avio_rb64(pb);
169  m->size = avio_rb16(pb) + 1;
170 
171  while (!avio_feof(pb)) {
172  unsigned type, ssize, codec_id = 0;
173  unsigned codec_type, width = 0, height = 0, sample_rate = 0, channels = 0;
174  int stream_index = -1;
175  int format;
176  AVRational fps;
177 
178  read_var_byte(s, &type);
179  read_var_byte(s, &ssize);
180 
181  switch (type) {
182  case 0:
183  if (ssize > 0)
184  avio_skip(pb, ssize);
185  return 0;
186  case 2:
187  codec_type = AVMEDIA_TYPE_AUDIO;
188  stream_index = avio_r8(pb);
189  codec_id = avio_r8(pb);
190  switch (codec_id) {
191  case 0: codec_id = AV_CODEC_ID_FASTAUDIO; break;
192  case 1: codec_id = AV_CODEC_ID_ADPCM_IMA_MOFLEX; break;
193  case 2: codec_id = AV_CODEC_ID_PCM_S16LE; break;
194  default:
195  av_log(s, AV_LOG_ERROR, "Unsupported audio codec: %d\n", codec_id);
196  return AVERROR_PATCHWELCOME;
197  }
198  sample_rate = avio_rb24(pb) + 1;
199  channels = avio_r8(pb) + 1;
200  break;
201  case 1:
202  case 3:
203  codec_type = AVMEDIA_TYPE_VIDEO;
204  stream_index = avio_r8(pb);
205  codec_id = avio_r8(pb);
206  switch (codec_id) {
207  case 0: codec_id = AV_CODEC_ID_MOBICLIP; break;
208  default:
209  av_log(s, AV_LOG_ERROR, "Unsupported video codec: %d\n", codec_id);
210  return AVERROR_PATCHWELCOME;
211  }
212  fps.num = avio_rb16(pb);
213  fps.den = avio_rb16(pb);
214  width = avio_rb16(pb);
215  height = avio_rb16(pb);
216  format = AV_PIX_FMT_YUV420P;
217  avio_skip(pb, type == 3 ? 3 : 2);
218  break;
219  case 4:
220  codec_type = AVMEDIA_TYPE_DATA;
221  stream_index = avio_r8(pb);
222  avio_skip(pb, 1);
223  break;
224  }
225 
226  if (stream_index == s->nb_streams) {
228 
229  if (!st)
230  return AVERROR(ENOMEM);
231 
233  st->codecpar->codec_id = codec_id;
234  st->codecpar->width = width;
235  st->codecpar->height = height;
237  st->codecpar->channels = channels;
238  st->codecpar->format = format;
239  st->priv_data = av_packet_alloc();
240  if (!st->priv_data)
241  return AVERROR(ENOMEM);
242 
243  if (sample_rate)
244  avpriv_set_pts_info(st, 63, 1, sample_rate);
245  else
246  avpriv_set_pts_info(st, 63, fps.den, fps.num);
247  }
248  }
249 
250  return 0;
251 }
252 
254 {
255  int ret;
256 
257  ret = moflex_read_sync(s);
258  if (ret < 0)
259  return ret;
260 
262  avio_seek(s->pb, 0, SEEK_SET);
263 
264  return 0;
265 }
266 
268 {
270  AVIOContext *pb = s->pb;
271  BitReader *br = &m->br;
272  int ret;
273 
274  while (!avio_feof(pb)) {
275  if (!m->in_block) {
276  m->pos = avio_tell(pb);
277 
278  ret = moflex_read_sync(s);
279  if (ret < 0)
280  return ret;
281 
282  m->flags = avio_r8(pb);
283  if (m->flags & 2)
284  avio_skip(pb, 2);
285  }
286 
287  while ((avio_tell(pb) < m->pos + m->size) && !avio_feof(pb) && avio_r8(pb)) {
288  int stream_index, bits, pkt_size, endframe;
289  AVPacket *packet;
290 
291  m->in_block = 1;
292 
293  avio_seek(pb, -1, SEEK_CUR);
294  br->pos = br->last = 0;
295 
296  bits = pop_length(br, pb);
297  if (bits < 0)
298  return bits;
299  stream_index = pop_int(br, pb, bits);
300  if (stream_index < 0)
301  return stream_index;
302  if (stream_index >= s->nb_streams)
303  return AVERROR_INVALIDDATA;
304 
305  endframe = pop(br, pb);
306  if (endframe < 0)
307  return endframe;
308  if (endframe) {
309  bits = pop_length(br, pb);
310  if (bits < 0)
311  return bits;
312  pop_int(br, pb, bits);
313  pop(br, pb);
314  bits = pop_length(br, pb);
315  if (bits < 0)
316  return bits;
317  pop_int(br, pb, bits * 2 + 26);
318  }
319 
320  pkt_size = pop_int(br, pb, 13) + 1;
321  if (pkt_size > m->size)
322  return AVERROR_INVALIDDATA;
323  packet = s->streams[stream_index]->priv_data;
324  if (!packet) {
325  avio_skip(pb, pkt_size);
326  continue;
327  }
328 
329  ret = av_append_packet(pb, packet, pkt_size);
330  if (ret < 0)
331  return ret;
332  if (endframe && packet->size > 0) {
333  av_packet_move_ref(pkt, packet);
334  pkt->pos = m->pos;
335  pkt->stream_index = stream_index;
336  if (s->streams[stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
337  pkt->duration = 1;
338  if (pkt->data[0] & 0x80)
339  pkt->flags |= AV_PKT_FLAG_KEY;
340  } else {
341  pkt->flags |= AV_PKT_FLAG_KEY;
342  }
343  return ret;
344  }
345  }
346 
347  m->in_block = 0;
348 
349  if (m->flags % 2 == 0) {
350  if (m->size <= 0)
351  return AVERROR_INVALIDDATA;
352  avio_seek(pb, m->pos + m->size, SEEK_SET);
353  }
354  }
355 
356  return AVERROR_EOF;
357 }
358 
359 static int moflex_read_seek(AVFormatContext *s, int stream_index,
360  int64_t pts, int flags)
361 {
363 
364  m->in_block = 0;
365 
366  return -1;
367 }
368 
370 {
371  for (int i = 0; i < s->nb_streams; i++) {
373  }
374 
375  return 0;
376 }
377 
379  .name = "moflex",
380  .long_name = NULL_IF_CONFIG_SMALL("MobiClip MOFLEX"),
381  .priv_data_size = sizeof(MOFLEXDemuxContext),
387  .extensions = "moflex",
389 };
fg outputs[0] format
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:389
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4999
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int num
Numerator.
Definition: rational.h:59
int size
Definition: packet.h:370
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
enum AVMediaType codec_type
Definition: rtp.c:37
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
GLint GLenum type
Definition: opengl_enc.c:104
void * priv_data
Definition: avformat.h:899
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
AVPacket * pkt
Definition: movenc.c:59
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:766
int ctx_flags
Flags signalling stream properties.
Definition: avformat.h:1296
Format I/O context.
Definition: avformat.h:1247
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:75
Opaque data information usually continuous.
Definition: avutil.h:203
int width
Video only.
Definition: codec_par.h:126
#define AVFMTCTX_NOHEADER
signal that no header is present (streams are added dynamically)
Definition: avformat.h:1187
static int moflex_probe(const AVProbeData *p)
Definition: moflex.c:120
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:387
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:108
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4553
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1315
#define height
uint8_t * data
Definition: packet.h:369
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Definition: avpacket.c:690
#define AVERROR_EOF
End of file.
Definition: error.h:55
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
ptrdiff_t size
Definition: opengl_enc.c:100
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:902
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
static int moflex_read_header(AVFormatContext *s)
Definition: moflex.c:253
channels
Definition: aptx.h:33
#define av_log(a,...)
int av_append_packet(AVIOContext *s, AVPacket *pkt, int size)
Read data and append it to the current content of the AVPacket.
Definition: utils.c:326
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:410
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:158
#define U(x)
Definition: vp56_arith.h:37
static int moflex_read_close(AVFormatContext *s)
Definition: moflex.c:369
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:168
static int pop(BitReader *br, AVIOContext *pb)
Definition: moflex.c:44
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:117
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
uint8_t bits
Definition: vp3data.h:141
static int moflex_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
Definition: moflex.c:359
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:375
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1303
unsigned int avio_rb24(AVIOContext *s)
Definition: aviobuf.c:774
#define FFMIN(a, b)
Definition: common.h:105
#define width
AVInputFormat ff_moflex_demuxer
Definition: moflex.c:378
int64_t pos
Definition: moflex.c:36
#define s(width, name)
Definition: cbs_vp9.c:257
unsigned pos
Definition: moflex.c:31
enum AVCodecID codec_id
Definition: vaapi_decode.c:369
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
static int moflex_read_sync(AVFormatContext *s)
Definition: moflex.c:155
Stream structure.
Definition: avformat.h:884
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
unsigned size
Definition: moflex.c:35
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
sample_rate
AVIOContext * pb
I/O context.
Definition: avformat.h:1289
int64_t ts
Definition: moflex.c:37
static int moflex_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: moflex.c:267
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:463
Rational number (pair of numerator and denominator).
Definition: rational.h:58
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
static int pop_length(BitReader *br, AVIOContext *pb)
Definition: moflex.c:75
static int pop_int(BitReader *br, AVIOContext *pb, int n)
Definition: moflex.c:58
static int64_t pts
#define flags(name, subs,...)
Definition: cbs_av1.c:561
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int sample_rate
Audio only.
Definition: codec_par.h:170
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
Main libavformat public API header.
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
unsigned last
Definition: moflex.c:30
int den
Denominator.
Definition: rational.h:60
static int read_var_byte(AVFormatContext *s, unsigned *out)
Definition: moflex.c:87
void * priv_data
Format private data.
Definition: avformat.h:1275
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:64
int channels
Audio only.
Definition: codec_par.h:166
FILE * out
Definition: movenc.c:54
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
BitReader br
Definition: moflex.c:41
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1049
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
int stream_index
Definition: packet.h:371
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
This structure stores compressed data.
Definition: packet.h:346
int i
Definition: input.c:407