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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(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  thp->framecnt = avio_rb32(pb);
79  thp->first_framesz = avio_rb32(pb);
80  pb->maxsize = avio_rb32(pb);
81  if(fsize>0 && (!pb->maxsize || fsize < pb->maxsize))
82  pb->maxsize= fsize;
83 
84  thp->compoff = avio_rb32(pb);
85  avio_rb32(pb); /* offsetDataOffset. */
86  thp->first_frame = avio_rb32(pb);
87  thp->last_frame = avio_rb32(pb);
88 
89  thp->next_framesz = thp->first_framesz;
90  thp->next_frame = thp->first_frame;
91 
92  /* Read the component structure. */
93  avio_seek (pb, thp->compoff, SEEK_SET);
94  thp->compcount = avio_rb32(pb);
95 
96  /* Read the list of component types. */
97  avio_read(pb, thp->components, 16);
98 
99  for (i = 0; i < thp->compcount; i++) {
100  if (thp->components[i] == 0) {
101  if (thp->vst)
102  break;
103 
104  /* Video component. */
105  st = avformat_new_stream(s, NULL);
106  if (!st)
107  return AVERROR(ENOMEM);
108 
109  /* The denominator and numerator are switched because 1/fps
110  is required. */
111  avpriv_set_pts_info(st, 64, thp->fps.den, thp->fps.num);
114  st->codecpar->codec_tag = 0; /* no fourcc */
115  st->codecpar->width = avio_rb32(pb);
116  st->codecpar->height = avio_rb32(pb);
117  st->codecpar->sample_rate = av_q2d(thp->fps);
118  st->nb_frames =
119  st->duration = thp->framecnt;
120  thp->vst = st;
121  thp->video_stream_index = st->index;
122 
123  if (thp->version == 0x11000)
124  avio_rb32(pb); /* Unknown. */
125  } else if (thp->components[i] == 1) {
126  if (thp->has_audio != 0)
127  break;
128 
129  /* Audio component. */
130  st = avformat_new_stream(s, NULL);
131  if (!st)
132  return AVERROR(ENOMEM);
133 
136  st->codecpar->codec_tag = 0; /* no fourcc */
137  st->codecpar->channels = avio_rb32(pb); /* numChannels. */
138  st->codecpar->sample_rate = avio_rb32(pb); /* Frequency. */
139  st->duration = avio_rb32(pb);
140 
141  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
142 
143  thp->audio_stream_index = st->index;
144  thp->has_audio = 1;
145  }
146  }
147 
148  return 0;
149 }
150 
152  AVPacket *pkt)
153 {
154  ThpDemuxContext *thp = s->priv_data;
155  AVIOContext *pb = s->pb;
156  unsigned int size;
157  int ret;
158 
159  if (thp->audiosize == 0) {
160  /* Terminate when last frame is reached. */
161  if (thp->frame >= thp->framecnt)
162  return AVERROR_EOF;
163 
164  avio_seek(pb, thp->next_frame, SEEK_SET);
165 
166  /* Locate the next frame and read out its size. */
167  thp->next_frame += FFMAX(thp->next_framesz, 1);
168  thp->next_framesz = avio_rb32(pb);
169 
170  avio_rb32(pb); /* Previous total size. */
171  size = avio_rb32(pb); /* Total size of this frame. */
172 
173  /* Store the audiosize so the next time this function is called,
174  the audio can be read. */
175  if (thp->has_audio)
176  thp->audiosize = avio_rb32(pb); /* Audio size. */
177  else
178  thp->frame++;
179 
180  ret = av_get_packet(pb, pkt, size);
181  if (ret < 0)
182  return ret;
183  if (ret != size) {
184  av_packet_unref(pkt);
185  return AVERROR(EIO);
186  }
187 
188  pkt->stream_index = thp->video_stream_index;
189  } else {
190  ret = av_get_packet(pb, pkt, thp->audiosize);
191  if (ret < 0)
192  return ret;
193  if (ret != thp->audiosize) {
194  av_packet_unref(pkt);
195  return AVERROR(EIO);
196  }
197 
198  pkt->stream_index = thp->audio_stream_index;
199  if (thp->audiosize >= 8)
200  pkt->duration = AV_RB32(&pkt->data[4]);
201 
202  thp->audiosize = 0;
203  thp->frame++;
204  }
205 
206  return 0;
207 }
208 
210  .name = "thp",
211  .long_name = NULL_IF_CONFIG_SMALL("THP"),
212  .priv_data_size = sizeof(ThpDemuxContext),
216 };
unsigned framecnt
Definition: thp.c:33
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:292
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:4399
int video_stream_index
Definition: thp.c:38
AVInputFormat ff_thp_demuxer
Definition: thp.c:209
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: avcodec.h:3911
int num
numerator
Definition: rational.h:44
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:213
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:213
Format I/O context.
Definition: avformat.h:1319
int width
Video only.
Definition: avcodec.h:3977
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:703
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1592
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:4037
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
static double av_q2d(AVRational a)
Convert rational to double.
Definition: rational.h:80
uint8_t * data
Definition: avcodec.h:1574
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:260
ptrdiff_t size
Definition: opengl_enc.c:101
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:550
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3907
unsigned next_framesz
Definition: thp.c:37
static int thp_probe(AVProbeData *p)
Definition: thp.c:48
#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:461
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
unsigned first_frame
Definition: thp.c:29
AVRational fps
Definition: thp.c:34
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:638
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:1361
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:549
unsigned first_framesz
Definition: thp.c:30
rational number numerator/denominator
Definition: rational.h:43
#define isnan(x)
Definition: libm.h:340
This structure contains the data a format has to probe a file.
Definition: avformat.h:459
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:930
int sample_rate
Audio only.
Definition: avcodec.h:4021
unsigned frame
Definition: thp.c:35
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:471
Main libavformat public API header.
int version
Definition: thp.c:28
static int thp_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: thp.c:151
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:932
int den
denominator
Definition: rational.h:45
void * priv_data
Format private data.
Definition: avformat.h:1347
int audio_stream_index
Definition: thp.c:39
int channels
Audio only.
Definition: avcodec.h:4017
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:660
AVCodecParameters * codecpar
Definition: avformat.h:1006
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3915
static int64_t fsize(FILE *f)
Definition: audiomatch.c:28
int stream_index
Definition: avcodec.h:1576
unsigned audiosize
Definition: thp.c:44
int has_audio
Definition: thp.c:43
#define MKTAG(a, b, c, d)
Definition: common.h:342
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: avcodec.h:1551
int compcount
Definition: thp.c:40