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
thp_probe(const AVProbeData * p)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'))
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
thp_read_header(AVFormatContext * s)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
thp_read_packet(AVFormatContext * s,AVPacket * pkt)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 };
226