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 "avio_internal.h"
26 #include "internal.h"
27 
28  typedef struct ThpDemuxContext {
29   int version;
30   unsigned first_frame;
31   unsigned first_framesz;
32   unsigned last_frame;
33   int compoff;
34   unsigned framecnt;
35   AVRational fps;
36   unsigned frame;
37   int64_t next_frame;
38   unsigned next_framesz;
39   int video_stream_index;
40   int audio_stream_index;
41   int compcount;
42   unsigned char components[16];
43   AVStream* vst;
44   int has_audio;
45   unsigned audiosize;
46 } ThpDemuxContext;
47 
48 
49  static int thp_probe(const AVProbeData *p)
50 {
51  double d;
52  /* check file header */
53  if (AV_RL32(p->buf) != MKTAG('T', 'H', 'P', '0円'))
54  return 0;
55 
56  d = av_int2float(AV_RB32(p->buf + 16));
57  if (d < 0.1 || d > 1000 || isnan(d))
58  return AVPROBE_SCORE_MAX/4;
59 
60  return AVPROBE_SCORE_MAX;
61 }
62 
63  static int thp_read_header(AVFormatContext *s)
64 {
65  ThpDemuxContext *thp = s->priv_data;
66  AVStream *st;
67  AVIOContext *pb = s->pb;
68  int64_t fsize= avio_size(pb);
69  uint32_t maxsize;
70  int i;
71 
72  /* Read the file header. */
73  avio_rb32(pb); /* Skip Magic. */
74  thp->version = avio_rb32(pb);
75 
76  avio_rb32(pb); /* Max buf size. */
77  avio_rb32(pb); /* Max samples. */
78 
79  thp->fps = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX);
80  if (thp->fps.den <= 0 || thp->fps.num < 0)
81  return AVERROR_INVALIDDATA;
82  thp->framecnt = avio_rb32(pb);
83  thp->first_framesz = avio_rb32(pb);
84  maxsize = avio_rb32(pb);
85  if (fsize > 0 && (!maxsize || fsize < maxsize))
86  maxsize = fsize;
87  ffiocontext(pb)->maxsize = fsize;
88 
89  thp->compoff = avio_rb32(pb);
90  avio_rb32(pb); /* offsetDataOffset. */
91  thp->first_frame = avio_rb32(pb);
92  thp->last_frame = avio_rb32(pb);
93 
94  thp->next_framesz = thp->first_framesz;
95  thp->next_frame = thp->first_frame;
96 
97  /* Read the component structure. */
98  avio_seek (pb, thp->compoff, SEEK_SET);
99  thp->compcount = avio_rb32(pb);
100 
101  if (thp->compcount > FF_ARRAY_ELEMS(thp->components))
102  return AVERROR_INVALIDDATA;
103 
104  /* Read the list of component types. */
105  avio_read(pb, thp->components, 16);
106 
107  for (i = 0; i < thp->compcount; i++) {
108  if (thp->components[i] == 0) {
109  if (thp->vst)
110  break;
111 
112  /* Video component. */
113  st = avformat_new_stream(s, NULL);
114  if (!st)
115  return AVERROR(ENOMEM);
116 
117  /* The denominator and numerator are switched because 1/fps
118  is required. */
119  avpriv_set_pts_info(st, 64, thp->fps.den, thp->fps.num);
120  st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
121  st->codecpar->codec_id = AV_CODEC_ID_THP;
122  st->codecpar->codec_tag = 0; /* no fourcc */
123  st->codecpar->width = avio_rb32(pb);
124  st->codecpar->height = avio_rb32(pb);
125  st->codecpar->sample_rate = av_q2d(thp->fps);
126  st->nb_frames =
127  st->duration = thp->framecnt;
128  thp->vst = st;
129  thp->video_stream_index = st->index;
130 
131  if (thp->version == 0x11000)
132  avio_rb32(pb); /* Unknown. */
133  } else if (thp->components[i] == 1) {
134  if (thp->has_audio != 0)
135  break;
136 
137  /* Audio component. */
138  st = avformat_new_stream(s, NULL);
139  if (!st)
140  return AVERROR(ENOMEM);
141 
142  st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
143  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_THP;
144  st->codecpar->codec_tag = 0; /* no fourcc */
145  st->codecpar->ch_layout.nb_channels = avio_rb32(pb);
146  st->codecpar->sample_rate = avio_rb32(pb); /* Frequency. */
147  st->duration = avio_rb32(pb);
148 
149  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
150 
151  thp->audio_stream_index = st->index;
152  thp->has_audio = 1;
153  }
154  }
155 
156  if (!thp->vst)
157  return AVERROR_INVALIDDATA;
158 
159  return 0;
160 }
161 
162  static int thp_read_packet(AVFormatContext *s,
163  AVPacket *pkt)
164 {
165  ThpDemuxContext *thp = s->priv_data;
166  AVIOContext *pb = s->pb;
167  unsigned int size;
168  int ret;
169 
170  if (thp->audiosize == 0) {
171  /* Terminate when last frame is reached. */
172  if (thp->frame >= thp->framecnt)
173  return AVERROR_EOF;
174 
175  avio_seek(pb, thp->next_frame, SEEK_SET);
176 
177  /* Locate the next frame and read out its size. */
178  thp->next_frame += FFMAX(thp->next_framesz, 1);
179  thp->next_framesz = avio_rb32(pb);
180 
181  avio_rb32(pb); /* Previous total size. */
182  size = avio_rb32(pb); /* Total size of this frame. */
183 
184  /* Store the audiosize so the next time this function is called,
185  the audio can be read. */
186  if (thp->has_audio)
187  thp->audiosize = avio_rb32(pb); /* Audio size. */
188  else
189  thp->frame++;
190 
191  ret = av_get_packet(pb, pkt, size);
192  if (ret < 0)
193  return ret;
194  if (ret != size) {
195  return AVERROR(EIO);
196  }
197 
198  pkt->stream_index = thp->video_stream_index;
199  } else {
200  ret = av_get_packet(pb, pkt, thp->audiosize);
201  if (ret < 0)
202  return ret;
203  if (ret != thp->audiosize) {
204  return AVERROR(EIO);
205  }
206 
207  pkt->stream_index = thp->audio_stream_index;
208  if (thp->audiosize >= 8)
209  pkt->duration = AV_RB32(&pkt->data[4]);
210 
211  thp->audiosize = 0;
212  thp->frame++;
213  }
214 
215  return 0;
216 }
217 
218  const AVInputFormat ff_thp_demuxer = {
219  .name = "thp",
220  .long_name = NULL_IF_CONFIG_SMALL("THP"),
221  .priv_data_size = sizeof(ThpDemuxContext),
222  .read_probe = thp_probe,
223  .read_header = thp_read_header,
224  .read_packet = thp_read_packet
225 };
ThpDemuxContext
Definition: thp.c:28
ThpDemuxContext::audio_stream_index
int audio_stream_index
Definition: thp.c:40
AVERROR
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
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: options.c:237
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:57
ffiocontext
static av_always_inline FFIOContext * ffiocontext(AVIOContext *ctx)
Definition: avio_internal.h:82
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
ThpDemuxContext::vst
AVStream * vst
Definition: thp.c:43
thp_probe
static int thp_probe(const AVProbeData *p)
Definition: thp.c:49
AVPacket::data
uint8_t * data
Definition: packet.h:374
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:392
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:65
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AV_CODEC_ID_THP
@ AV_CODEC_ID_THP
Definition: codec_id.h:150
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:300
intfloat.h
avio_size
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:352
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:465
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:697
av_int2float
static av_always_inline float av_int2float(uint32_t i)
Reinterpret a 32-bit integer as a float.
Definition: intfloat.h:40
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:998
AVRational::num
int num
Numerator.
Definition: rational.h:59
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:790
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:656
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:256
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:661
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:455
ThpDemuxContext::first_frame
unsigned first_frame
Definition: thp.c:30
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:127
av_q2d
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
ThpDemuxContext::next_framesz
unsigned next_framesz
Definition: thp.c:38
thp_read_header
static int thp_read_header(AVFormatContext *s)
Definition: thp.c:63
fsize
static int64_t fsize(FILE *f)
Definition: audiomatch.c:29
ThpDemuxContext::next_frame
int64_t next_frame
Definition: thp.c:37
AVFormatContext
Format I/O context.
Definition: avformat.h:1213
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1108
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:532
ThpDemuxContext::components
unsigned char components[16]
Definition: thp.c:42
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
isnan
#define isnan(x)
Definition: libm.h:340
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:453
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:212
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:177
FFIOContext::maxsize
int64_t maxsize
max filesize, used to limit allocations
Definition: avio_internal.h:47
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:1000
AVIOContext
Bytestream IO Context.
Definition: avio.h:162
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:117
ThpDemuxContext::audiosize
unsigned audiosize
Definition: thp.c:45
size
int size
Definition: twinvq_data.h:10344
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:96
ff_thp_demuxer
const AVInputFormat ff_thp_demuxer
Definition: thp.c:218
ThpDemuxContext::compoff
int compoff
Definition: thp.c:33
ThpDemuxContext::first_framesz
unsigned first_framesz
Definition: thp.c:31
thp_read_packet
static int thp_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: thp.c:162
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
avio_internal.h
AVCodecParameters::height
int height
Definition: codec_par.h:128
av_d2q
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
ThpDemuxContext::compcount
int compcount
Definition: thp.c:41
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:102
ThpDemuxContext::video_stream_index
int video_stream_index
Definition: thp.c:39
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:948
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:260
avformat.h
ThpDemuxContext::fps
AVRational fps
Definition: thp.c:35
ThpDemuxContext::version
int version
Definition: thp.c:29
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVStream::index
int index
stream index in AVFormatContext
Definition: avformat.h:956
AVRational::den
int den
Denominator.
Definition: rational.h:60
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:641
ThpDemuxContext::frame
unsigned frame
Definition: thp.c:36
AVPacket::stream_index
int stream_index
Definition: packet.h:376
AV_CODEC_ID_ADPCM_THP
@ AV_CODEC_ID_ADPCM_THP
Definition: codec_id.h:375
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:61
AVPacket
This structure stores compressed data.
Definition: packet.h:351
ThpDemuxContext::has_audio
int has_audio
Definition: thp.c:44
d
d
Definition: ffmpeg_filter.c:153
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
ThpDemuxContext::last_frame
unsigned last_frame
Definition: thp.c:32
ThpDemuxContext::framecnt
unsigned framecnt
Definition: thp.c:34
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