FFmpeg
thp.c
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1 /*
2  * THP Demuxer
3  * Copyright (c) 2007 Marco Gerards
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/intfloat.h"
24 #include "avformat.h"
25 #include "internal.h"
26 
27 typedef struct ThpDemuxContext {
28  int version;
29  unsigned first_frame;
30  unsigned first_framesz;
31  unsigned last_frame;
32  int compoff;
33  unsigned framecnt;
35  unsigned frame;
36  int64_t next_frame;
37  unsigned next_framesz;
40  int compcount;
41  unsigned char components[16];
43  int has_audio;
44  unsigned audiosize;
46 
47 
48 static int thp_probe(const AVProbeData *p)
49 {
50  double d;
51  /* check file header */
52  if (AV_RL32(p->buf) != MKTAG('T', 'H', 'P', '\0'))
53  return 0;
54 
55  d = av_int2float(AV_RB32(p->buf + 16));
56  if (d < 0.1 || d > 1000 || isnan(d))
57  return AVPROBE_SCORE_MAX/4;
58 
59  return AVPROBE_SCORE_MAX;
60 }
61 
63 {
64  ThpDemuxContext *thp = s->priv_data;
65  AVStream *st;
66  AVIOContext *pb = s->pb;
67  int64_t fsize= avio_size(pb);
68  int i;
69 
70  /* Read the file header. */
71  avio_rb32(pb); /* Skip Magic. */
72  thp->version = avio_rb32(pb);
73 
74  avio_rb32(pb); /* Max buf size. */
75  avio_rb32(pb); /* Max samples. */
76 
77  thp->fps = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX);
78  if (thp->fps.den <= 0 || thp->fps.num < 0)
79  return AVERROR_INVALIDDATA;
80  thp->framecnt = avio_rb32(pb);
81  thp->first_framesz = avio_rb32(pb);
82  pb->maxsize = avio_rb32(pb);
83  if(fsize>0 && (!pb->maxsize || fsize < pb->maxsize))
84  pb->maxsize= fsize;
85 
86  thp->compoff = avio_rb32(pb);
87  avio_rb32(pb); /* offsetDataOffset. */
88  thp->first_frame = avio_rb32(pb);
89  thp->last_frame = avio_rb32(pb);
90 
91  thp->next_framesz = thp->first_framesz;
92  thp->next_frame = thp->first_frame;
93 
94  /* Read the component structure. */
95  avio_seek (pb, thp->compoff, SEEK_SET);
96  thp->compcount = avio_rb32(pb);
97 
98  if (thp->compcount > FF_ARRAY_ELEMS(thp->components))
99  return AVERROR_INVALIDDATA;
100 
101  /* Read the list of component types. */
102  avio_read(pb, thp->components, 16);
103 
104  for (i = 0; i < thp->compcount; i++) {
105  if (thp->components[i] == 0) {
106  if (thp->vst)
107  break;
108 
109  /* Video component. */
110  st = avformat_new_stream(s, NULL);
111  if (!st)
112  return AVERROR(ENOMEM);
113 
114  /* The denominator and numerator are switched because 1/fps
115  is required. */
116  avpriv_set_pts_info(st, 64, thp->fps.den, thp->fps.num);
119  st->codecpar->codec_tag = 0; /* no fourcc */
120  st->codecpar->width = avio_rb32(pb);
121  st->codecpar->height = avio_rb32(pb);
122  st->codecpar->sample_rate = av_q2d(thp->fps);
123  st->nb_frames =
124  st->duration = thp->framecnt;
125  thp->vst = st;
126  thp->video_stream_index = st->index;
127 
128  if (thp->version == 0x11000)
129  avio_rb32(pb); /* Unknown. */
130  } else if (thp->components[i] == 1) {
131  if (thp->has_audio != 0)
132  break;
133 
134  /* Audio component. */
135  st = avformat_new_stream(s, NULL);
136  if (!st)
137  return AVERROR(ENOMEM);
138 
141  st->codecpar->codec_tag = 0; /* no fourcc */
142  st->codecpar->channels = avio_rb32(pb); /* numChannels. */
143  st->codecpar->sample_rate = avio_rb32(pb); /* Frequency. */
144  st->duration = avio_rb32(pb);
145 
146  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
147 
148  thp->audio_stream_index = st->index;
149  thp->has_audio = 1;
150  }
151  }
152 
153  if (!thp->vst)
154  return AVERROR_INVALIDDATA;
155 
156  return 0;
157 }
158 
160  AVPacket *pkt)
161 {
162  ThpDemuxContext *thp = s->priv_data;
163  AVIOContext *pb = s->pb;
164  unsigned int size;
165  int ret;
166 
167  if (thp->audiosize == 0) {
168  /* Terminate when last frame is reached. */
169  if (thp->frame >= thp->framecnt)
170  return AVERROR_EOF;
171 
172  avio_seek(pb, thp->next_frame, SEEK_SET);
173 
174  /* Locate the next frame and read out its size. */
175  thp->next_frame += FFMAX(thp->next_framesz, 1);
176  thp->next_framesz = avio_rb32(pb);
177 
178  avio_rb32(pb); /* Previous total size. */
179  size = avio_rb32(pb); /* Total size of this frame. */
180 
181  /* Store the audiosize so the next time this function is called,
182  the audio can be read. */
183  if (thp->has_audio)
184  thp->audiosize = avio_rb32(pb); /* Audio size. */
185  else
186  thp->frame++;
187 
188  ret = av_get_packet(pb, pkt, size);
189  if (ret < 0)
190  return ret;
191  if (ret != size) {
192  return AVERROR(EIO);
193  }
194 
195  pkt->stream_index = thp->video_stream_index;
196  } else {
197  ret = av_get_packet(pb, pkt, thp->audiosize);
198  if (ret < 0)
199  return ret;
200  if (ret != thp->audiosize) {
201  return AVERROR(EIO);
202  }
203 
204  pkt->stream_index = thp->audio_stream_index;
205  if (thp->audiosize >= 8)
206  pkt->duration = AV_RB32(&pkt->data[4]);
207 
208  thp->audiosize = 0;
209  thp->frame++;
210  }
211 
212  return 0;
213 }
214 
216  .name = "thp",
217  .long_name = NULL_IF_CONFIG_SMALL("THP"),
218  .priv_data_size = sizeof(ThpDemuxContext),
222 };
unsigned framecnt
Definition: thp.c:33
#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
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:346
static int thp_read_header(AVFormatContext *s)
Definition: thp.c:62
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:4938
int video_stream_index
Definition: thp.c:38
AVInputFormat ff_thp_demuxer
Definition: thp.c:215
static av_always_inline float av_int2float(uint32_t i)
Reinterpret a 32-bit integer as a float.
Definition: intfloat.h:40
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 index
stream index in AVFormatContext
Definition: avformat.h:877
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
static int thp_probe(const AVProbeData *p)
Definition: thp.c:48
static AVPacket pkt
int64_t maxsize
max filesize, used to limit allocations This field is internal to libavformat and access from outside...
Definition: avio.h:266
Format I/O context.
Definition: avformat.h:1351
int width
Video only.
Definition: codec_par.h:126
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:790
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:381
int compoff
Definition: thp.c:32
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4519
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
uint8_t * data
Definition: packet.h:363
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
unsigned char components[16]
Definition: thp.c:41
#define AVERROR_EOF
End of file.
Definition: error.h:55
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:304
ptrdiff_t size
Definition: opengl_enc.c:100
AVStream * vst
Definition: thp.c:42
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:637
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
unsigned next_framesz
Definition: thp.c:37
#define FFMAX(a, b)
Definition: common.h:94
int64_t next_frame
Definition: thp.c:36
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
unsigned first_frame
Definition: thp.c:29
AVRational fps
Definition: thp.c:34
#define s(width, name)
Definition: cbs_vp9.c:257
#define FF_ARRAY_ELEMS(a)
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
Stream structure.
Definition: avformat.h:876
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
unsigned first_framesz
Definition: thp.c:30
Rational number (pair of numerator and denominator).
Definition: rational.h:58
#define isnan(x)
Definition: libm.h:340
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:925
int sample_rate
Audio only.
Definition: codec_par.h:170
unsigned frame
Definition: thp.c:35
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
Main libavformat public API header.
int version
Definition: thp.c:28
static int thp_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: thp.c:159
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:927
int den
Denominator.
Definition: rational.h:60
void * priv_data
Format private data.
Definition: avformat.h:1379
int audio_stream_index
Definition: thp.c:39
int channels
Audio only.
Definition: codec_par.h:166
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:650
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
static int64_t fsize(FILE *f)
Definition: audiomatch.c:28
int stream_index
Definition: packet.h:365
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
unsigned audiosize
Definition: thp.c:44
int has_audio
Definition: thp.c:43
#define MKTAG(a, b, c, d)
Definition: common.h:406
unsigned last_frame
Definition: thp.c:31
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: packet.h:340
int i
Definition: input.c:407
int compcount
Definition: thp.c:40