FFmpeg: libavformat/thp.c Source File

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;
34   AVRational fps;
35   unsigned frame;
36   int64_t next_frame;
37   unsigned next_framesz;
38   int video_stream_index;
39   int audio_stream_index;
40   int compcount;
41   unsigned char components[16];
42   AVStream* vst;
43   int has_audio;
44   unsigned audiosize;
45 } ThpDemuxContext;
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円'))
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 
62  static int thp_read_header(AVFormatContext *s)
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);
112  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
113  st->codec->codec_id = AV_CODEC_ID_THP;
114  st->codec->codec_tag = 0; /* no fourcc */
115  st->codec->width = avio_rb32(pb);
116  st->codec->height = avio_rb32(pb);
117  st->nb_frames =
118  st->duration = thp->framecnt;
119  thp->vst = st;
120  thp->video_stream_index = st->index;
121 
122  if (thp->version == 0x11000)
123  avio_rb32(pb); /* Unknown. */
124  } else if (thp->components[i] == 1) {
125  if (thp->has_audio != 0)
126  break;
127 
128  /* Audio component. */
129  st = avformat_new_stream(s, NULL);
130  if (!st)
131  return AVERROR(ENOMEM);
132 
133  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
134  st->codec->codec_id = AV_CODEC_ID_ADPCM_THP;
135  st->codec->codec_tag = 0; /* no fourcc */
136  st->codec->channels = avio_rb32(pb); /* numChannels. */
137  st->codec->sample_rate = avio_rb32(pb); /* Frequency. */
138  st->duration = avio_rb32(pb);
139 
140  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
141 
142  thp->audio_stream_index = st->index;
143  thp->has_audio = 1;
144  }
145  }
146 
147  return 0;
148 }
149 
150  static int thp_read_packet(AVFormatContext *s,
151  AVPacket *pkt)
152 {
153  ThpDemuxContext *thp = s->priv_data;
154  AVIOContext *pb = s->pb;
155  unsigned int size;
156  int ret;
157 
158  if (thp->audiosize == 0) {
159  /* Terminate when last frame is reached. */
160  if (thp->frame >= thp->framecnt)
161  return AVERROR_EOF;
162 
163  avio_seek(pb, thp->next_frame, SEEK_SET);
164 
165  /* Locate the next frame and read out its size. */
166  thp->next_frame += FFMAX(thp->next_framesz, 1);
167  thp->next_framesz = avio_rb32(pb);
168 
169  avio_rb32(pb); /* Previous total size. */
170  size = avio_rb32(pb); /* Total size of this frame. */
171 
172  /* Store the audiosize so the next time this function is called,
173  the audio can be read. */
174  if (thp->has_audio)
175  thp->audiosize = avio_rb32(pb); /* Audio size. */
176  else
177  thp->frame++;
178 
179  ret = av_get_packet(pb, pkt, size);
180  if (ret < 0)
181  return ret;
182  if (ret != size) {
183  av_packet_unref(pkt);
184  return AVERROR(EIO);
185  }
186 
187  pkt->stream_index = thp->video_stream_index;
188  } else {
189  ret = av_get_packet(pb, pkt, thp->audiosize);
190  if (ret < 0)
191  return ret;
192  if (ret != thp->audiosize) {
193  av_packet_unref(pkt);
194  return AVERROR(EIO);
195  }
196 
197  pkt->stream_index = thp->audio_stream_index;
198  if (thp->audiosize >= 8)
199  pkt->duration = AV_RB32(&pkt->data[4]);
200 
201  thp->audiosize = 0;
202  thp->frame++;
203  }
204 
205  return 0;
206 }
207 
208  AVInputFormat ff_thp_demuxer = {
209  .name = "thp",
210  .long_name = NULL_IF_CONFIG_SMALL("THP"),
211  .priv_data_size = sizeof(ThpDemuxContext),
212  .read_probe = thp_probe,
213  .read_header = thp_read_header,
214  .read_packet = thp_read_packet
215 };
ThpDemuxContext::framecnt
unsigned framecnt
Definition: thp.c:33
NULL
#define NULL
Definition: coverity.c:32
s
const char * s
Definition: avisynth_c.h:631
AVIOContext
Bytestream IO Context.
Definition: avio.h:111
avio_size
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:287
thp_read_header
static int thp_read_header(AVFormatContext *s)
Definition: thp.c:62
avpriv_set_pts_info
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:4149
ThpDemuxContext::video_stream_index
int video_stream_index
Definition: thp.c:38
ff_thp_demuxer
AVInputFormat ff_thp_demuxer
Definition: thp.c:208
av_int2float
static av_always_inline float av_int2float(uint32_t i)
Reinterpret a 32-bit integer as a float.
Definition: intfloat.h:40
AVRational::num
int num
numerator
Definition: rational.h:44
AVStream::index
int index
stream index in AVFormatContext
Definition: avformat.h:878
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:208
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
AVIOContext::maxsize
int64_t maxsize
max filesize, used to limit allocations This field is internal to libavformat and access from outside...
Definition: avio.h:213
AVFormatContext
Format I/O context.
Definition: avformat.h:1314
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:698
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1485
ThpDemuxContext::compoff
int compoff
Definition: thp.c:32
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3805
AV_RB32
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
AVPacket::data
uint8_t * data
Definition: avcodec.h:1467
ThpDemuxContext::components
unsigned char components[16]
Definition: thp.c:41
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
av_get_packet
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:252
size
ptrdiff_t size
Definition: opengl_enc.c:101
ThpDemuxContext::vst
AVStream * vst
Definition: thp.c:42
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:545
AVERROR
#define AVERROR(e)
Definition: error.h:43
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
ThpDemuxContext::next_framesz
unsigned next_framesz
Definition: thp.c:37
AVMEDIA_TYPE_AUDIO
Definition: avutil.h:194
thp_probe
static int thp_probe(AVProbeData *p)
Definition: thp.c:48
FFMAX
#define FFMAX(a, b)
Definition: common.h:94
ThpDemuxContext::next_frame
int64_t next_frame
Definition: thp.c:36
AVStream::codec
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:896
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:462
av_d2q
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
ThpDemuxContext::first_frame
unsigned first_frame
Definition: thp.c:29
ThpDemuxContext::fps
AVRational fps
Definition: thp.c:34
read_probe
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:1711
AV_CODEC_ID_THP
Definition: avcodec.h:207
AVCodecContext::height
int height
Definition: avcodec.h:1711
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:638
AVStream
Stream structure.
Definition: avformat.h:877
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVCodecContext::codec_type
enum AVMediaType codec_type
Definition: avcodec.h:1540
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:1549
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: avcodec.h:2287
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1356
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:545
ThpDemuxContext::first_framesz
unsigned first_framesz
Definition: thp.c:30
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1564
AVRational
rational number numerator/denominator
Definition: rational.h:43
isnan
#define isnan(x)
Definition: libm.h:340
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:460
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:936
ThpDemuxContext::frame
unsigned frame
Definition: thp.c:35
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:472
avformat.h
Main libavformat public API header.
ThpDemuxContext::version
int version
Definition: thp.c:28
AV_CODEC_ID_ADPCM_THP
Definition: avcodec.h:376
thp_read_packet
static int thp_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: thp.c:150
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:938
AVRational::den
int den
denominator
Definition: rational.h:45
AVCodecContext::channels
int channels
number of audio channels
Definition: avcodec.h:2288
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1342
ThpDemuxContext::audio_stream_index
int audio_stream_index
Definition: thp.c:39
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:661
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:193
AVPacket::stream_index
int stream_index
Definition: avcodec.h:1469
ThpDemuxContext::audiosize
unsigned audiosize
Definition: thp.c:44
ThpDemuxContext::has_audio
int has_audio
Definition: thp.c:43
MKTAG
#define MKTAG(a, b, c, d)
Definition: common.h:342
ThpDemuxContext::last_frame
unsigned last_frame
Definition: thp.c:31
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1444
ThpDemuxContext::compcount
int compcount
Definition: thp.c:40
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