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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 != 0)
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->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 
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 
139  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
140 
141  thp->audio_stream_index = st->index;
142  thp->has_audio = 1;
143  }
144  }
145 
146  return 0;
147 }
148 
150  AVPacket *pkt)
151 {
152  ThpDemuxContext *thp = s->priv_data;
153  AVIOContext *pb = s->pb;
154  unsigned int size;
155  int ret;
156 
157  if (thp->audiosize == 0) {
158  /* Terminate when last frame is reached. */
159  if (thp->frame >= thp->framecnt)
160  return AVERROR_EOF;
161 
162  avio_seek(pb, thp->next_frame, SEEK_SET);
163 
164  /* Locate the next frame and read out its size. */
165  thp->next_frame += FFMAX(thp->next_framesz, 1);
166  thp->next_framesz = avio_rb32(pb);
167 
168  avio_rb32(pb); /* Previous total size. */
169  size = avio_rb32(pb); /* Total size of this frame. */
170 
171  /* Store the audiosize so the next time this function is called,
172  the audio can be read. */
173  if (thp->has_audio)
174  thp->audiosize = avio_rb32(pb); /* Audio size. */
175  else
176  thp->frame++;
177 
178  ret = av_get_packet(pb, pkt, size);
179  if (ret != size) {
180  av_free_packet(pkt);
181  return AVERROR(EIO);
182  }
183 
184  pkt->stream_index = thp->video_stream_index;
185  } else {
186  ret = av_get_packet(pb, pkt, thp->audiosize);
187  if (ret != thp->audiosize) {
188  av_free_packet(pkt);
189  return AVERROR(EIO);
190  }
191 
192  pkt->stream_index = thp->audio_stream_index;
193  if (thp->audiosize >= 8)
194  pkt->duration = AV_RB32(&pkt->data[4]);
195 
196  thp->audiosize = 0;
197  thp->frame++;
198  }
199 
200  return 0;
201 }
202 
204  .name = "thp",
205  .long_name = NULL_IF_CONFIG_SMALL("THP"),
206  .priv_data_size = sizeof(ThpDemuxContext),
210 };