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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;
32  int compoff;
33  int framecnt;
35  int frame;
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  /* check file header */
51  if (AV_RL32(p->buf) == MKTAG('T', 'H', 'P', '\0'))
52  return AVPROBE_SCORE_MAX;
53  else
54  return 0;
55 }
56 
58 {
59  ThpDemuxContext *thp = s->priv_data;
60  AVStream *st;
61  AVIOContext *pb = s->pb;
62  int64_t fsize= avio_size(pb);
63  int i;
64 
65  /* Read the file header. */
66  avio_rb32(pb); /* Skip Magic. */
67  thp->version = avio_rb32(pb);
68 
69  avio_rb32(pb); /* Max buf size. */
70  avio_rb32(pb); /* Max samples. */
71 
72  thp->fps = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX);
73  thp->framecnt = avio_rb32(pb);
74  thp->first_framesz = avio_rb32(pb);
75  pb->maxsize = avio_rb32(pb);
76  if(fsize>0 && (!pb->maxsize || fsize < pb->maxsize))
77  pb->maxsize= fsize;
78 
79  thp->compoff = avio_rb32(pb);
80  avio_rb32(pb); /* offsetDataOffset. */
81  thp->first_frame = avio_rb32(pb);
82  thp->last_frame = avio_rb32(pb);
83 
84  thp->next_framesz = thp->first_framesz;
85  thp->next_frame = thp->first_frame;
86 
87  /* Read the component structure. */
88  avio_seek (pb, thp->compoff, SEEK_SET);
89  thp->compcount = avio_rb32(pb);
90 
91  /* Read the list of component types. */
92  avio_read(pb, thp->components, 16);
93 
94  for (i = 0; i < thp->compcount; i++) {
95  if (thp->components[i] == 0) {
96  if (thp->vst != 0)
97  break;
98 
99  /* Video component. */
100  st = avformat_new_stream(s, NULL);
101  if (!st)
102  return AVERROR(ENOMEM);
103 
104  /* The denominator and numerator are switched because 1/fps
105  is required. */
106  avpriv_set_pts_info(st, 64, thp->fps.den, thp->fps.num);
109  st->codec->codec_tag = 0; /* no fourcc */
110  st->codec->width = avio_rb32(pb);
111  st->codec->height = avio_rb32(pb);
112  st->codec->sample_rate = av_q2d(thp->fps);
113  st->nb_frames =
114  st->duration = thp->framecnt;
115  thp->vst = st;
116  thp->video_stream_index = st->index;
117 
118  if (thp->version == 0x11000)
119  avio_rb32(pb); /* Unknown. */
120  } else if (thp->components[i] == 1) {
121  if (thp->has_audio != 0)
122  break;
123 
124  /* Audio component. */
125  st = avformat_new_stream(s, NULL);
126  if (!st)
127  return AVERROR(ENOMEM);
128 
131  st->codec->codec_tag = 0; /* no fourcc */
132  st->codec->channels = avio_rb32(pb); /* numChannels. */
133  st->codec->sample_rate = avio_rb32(pb); /* Frequency. */
134 
135  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
136 
137  thp->audio_stream_index = st->index;
138  thp->has_audio = 1;
139  }
140  }
141 
142  return 0;
143 }
144 
146  AVPacket *pkt)
147 {
148  ThpDemuxContext *thp = s->priv_data;
149  AVIOContext *pb = s->pb;
150  unsigned int size;
151  int ret;
152 
153  if (thp->audiosize == 0) {
154  /* Terminate when last frame is reached. */
155  if (thp->frame >= thp->framecnt)
156  return AVERROR_EOF;
157 
158  avio_seek(pb, thp->next_frame, SEEK_SET);
159 
160  /* Locate the next frame and read out its size. */
161  thp->next_frame += thp->next_framesz;
162  thp->next_framesz = avio_rb32(pb);
163 
164  avio_rb32(pb); /* Previous total size. */
165  size = avio_rb32(pb); /* Total size of this frame. */
166 
167  /* Store the audiosize so the next time this function is called,
168  the audio can be read. */
169  if (thp->has_audio)
170  thp->audiosize = avio_rb32(pb); /* Audio size. */
171  else
172  thp->frame++;
173 
174  ret = av_get_packet(pb, pkt, size);
175  if (ret != size) {
176  av_free_packet(pkt);
177  return AVERROR(EIO);
178  }
179 
180  pkt->stream_index = thp->video_stream_index;
181  } else {
182  ret = av_get_packet(pb, pkt, thp->audiosize);
183  if (ret != thp->audiosize) {
184  av_free_packet(pkt);
185  return AVERROR(EIO);
186  }
187 
188  pkt->stream_index = thp->audio_stream_index;
189  if (thp->audiosize >= 8)
190  pkt->duration = AV_RB32(&pkt->data[4]);
191 
192  thp->audiosize = 0;
193  thp->frame++;
194  }
195 
196  return 0;
197 }
198 
200  .name = "thp",
201  .long_name = NULL_IF_CONFIG_SMALL("THP"),
202  .priv_data_size = sizeof(ThpDemuxContext),
206 };