1 /*
2  * Beam Software SIFF demuxer
3  * Copyright (c) 2007 Konstantin Shishkov
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/channel_layout.h"
23 #include "libavutil/intreadwrite.h"
24 
25 #include "avformat.h"
26 #include "internal.h"
27 #include "avio_internal.h"
28 
29 enum SIFFTags {
30     TAG_SIFF = MKTAG('S', 'I', 'F', 'F'),
31     TAG_BODY = MKTAG('B', 'O', 'D', 'Y'),
32     TAG_VBHD = MKTAG('V', 'B', 'H', 'D'),
33     TAG_SHDR = MKTAG('S', 'H', 'D', 'R'),
34     TAG_VBV1 = MKTAG('V', 'B', 'V', '1'),
35     TAG_SOUN = MKTAG('S', 'O', 'U', 'N'),
36 };
37 
38 enum VBFlags {
39     VB_HAS_GMC     = 0x01,
40     VB_HAS_AUDIO   = 0x04,
41     VB_HAS_VIDEO   = 0x08,
42     VB_HAS_PALETTE = 0x10,
43     VB_HAS_LENGTH  = 0x20
44 };
45 
46 typedef struct SIFFContext {
47     int frames;
48     int cur_frame;
49     int rate;
50     int bits;
51     int block_align;
52 
53     int has_video;
54     int has_audio;
55 
56     int curstrm;
57     unsigned int pktsize;
58     int gmcsize;
59     unsigned int sndsize;
60 
61     unsigned int flags;
62     uint8_t gmc[4];
63 } SIFFContext;
64 
siff_probe(const AVProbeData *p)65 static int siff_probe(const AVProbeData *p)
66 {
67     uint32_t tag = AV_RL32(p->buf + 8);
68     /* check file header */
69     if (AV_RL32(p->buf) != TAG_SIFF ||
70         (tag != TAG_VBV1 && tag != TAG_SOUN))
71         return 0;
72     return AVPROBE_SCORE_MAX;
73 }
74 
create_audio_stream(AVFormatContext *s, SIFFContext *c)75 static int create_audio_stream(AVFormatContext *s, SIFFContext *c)
76 {
77     AVStream *ast;
78     ast = avformat_new_stream(s, NULL);
79     if (!ast)
80         return AVERROR(ENOMEM);
81     ast->codecpar->codec_type            = AVMEDIA_TYPE_AUDIO;
82     ast->codecpar->codec_id              = AV_CODEC_ID_PCM_U8;
83     ast->codecpar->ch_layout             = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
84     ast->codecpar->bits_per_coded_sample = 8;
85     ast->codecpar->sample_rate           = c->rate;
86     avpriv_set_pts_info(ast, 16, 1, c->rate);
87     ast->start_time                   = 0;
88     return 0;
89 }
90 
siff_parse_vbv1(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)91 static int siff_parse_vbv1(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)
92 {
93     AVStream *st;
94     int width, height;
95 
96     if (avio_rl32(pb) != TAG_VBHD) {
97         av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
98         return AVERROR_INVALIDDATA;
99     }
100     if (avio_rb32(pb) != 32) {
101         av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
102         return AVERROR_INVALIDDATA;
103     }
104     if (avio_rl16(pb) != 1) {
105         av_log(s, AV_LOG_ERROR, "Incorrect header version\n");
106         return AVERROR_INVALIDDATA;
107     }
108     width  = avio_rl16(pb);
109     height = avio_rl16(pb);
110     avio_skip(pb, 4);
111     c->frames = avio_rl16(pb);
112     if (!c->frames) {
113         av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
114         return AVERROR_INVALIDDATA;
115     }
116     c->bits        = avio_rl16(pb);
117     c->rate        = avio_rl16(pb);
118     c->block_align = c->rate * (c->bits >> 3);
119 
120     avio_skip(pb, 16); // zeroes
121 
122     st = avformat_new_stream(s, NULL);
123     if (!st)
124         return AVERROR(ENOMEM);
125     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
126     st->codecpar->codec_id   = AV_CODEC_ID_VB;
127     st->codecpar->codec_tag  = MKTAG('V', 'B', 'V', '1');
128     st->codecpar->width      = width;
129     st->codecpar->height     = height;
130     st->codecpar->format     = AV_PIX_FMT_PAL8;
131     st->nb_frames            =
132     st->duration             = c->frames;
133     avpriv_set_pts_info(st, 16, 1, 12);
134 
135     c->cur_frame = 0;
136     c->has_video = 1;
137     c->has_audio = !!c->rate;
138     c->curstrm   = -1;
139     if (c->has_audio)
140         return create_audio_stream(s, c);
141     return 0;
142 }
143 
siff_parse_soun(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)144 static int siff_parse_soun(AVFormatContext *s, SIFFContext *c, AVIOContext *pb)
145 {
146     if (avio_rl32(pb) != TAG_SHDR) {
147         av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
148         return AVERROR_INVALIDDATA;
149     }
150     if (avio_rb32(pb) != 8) {
151         av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
152         return AVERROR_INVALIDDATA;
153     }
154     avio_skip(pb, 4); // unknown value
155     c->rate        = avio_rl16(pb);
156     c->bits        = avio_rl16(pb);
157     c->block_align = c->rate * (c->bits >> 3);
158     return create_audio_stream(s, c);
159 }
160 
siff_read_header(AVFormatContext *s)161 static int siff_read_header(AVFormatContext *s)
162 {
163     AVIOContext *pb = s->pb;
164     SIFFContext *c  = s->priv_data;
165     uint32_t tag;
166     int ret;
167 
168     if (avio_rl32(pb) != TAG_SIFF)
169         return AVERROR_INVALIDDATA;
170     avio_skip(pb, 4); // ignore size
171     tag = avio_rl32(pb);
172 
173     if (tag != TAG_VBV1 && tag != TAG_SOUN) {
174         av_log(s, AV_LOG_ERROR, "Not a VBV file\n");
175         return AVERROR_INVALIDDATA;
176     }
177 
178     if (tag == TAG_VBV1 && (ret = siff_parse_vbv1(s, c, pb)) < 0)
179         return ret;
180     if (tag == TAG_SOUN && (ret = siff_parse_soun(s, c, pb)) < 0)
181         return ret;
182     if (avio_rl32(pb) != MKTAG('B', 'O', 'D', 'Y')) {
183         av_log(s, AV_LOG_ERROR, "'BODY' chunk is missing\n");
184         return AVERROR_INVALIDDATA;
185     }
186     avio_skip(pb, 4); // ignore size
187 
188     return 0;
189 }
190 
siff_read_packet(AVFormatContext *s, AVPacket *pkt)191 static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
192 {
193     SIFFContext *c = s->priv_data;
194     int ret;
195 
196     if (c->has_video) {
197         unsigned int size;
198         if (c->cur_frame >= c->frames)
199             return AVERROR_EOF;
200         if (c->curstrm == -1) {
201             c->pktsize = avio_rl32(s->pb) - 4;
202             c->flags   = avio_rl16(s->pb);
203             if (c->flags & VB_HAS_AUDIO && !c->has_audio)
204                 return AVERROR_INVALIDDATA;
205             c->gmcsize = (c->flags & VB_HAS_GMC) ? 4 : 0;
206             if (c->gmcsize)
207                 avio_read(s->pb, c->gmc, c->gmcsize);
208             c->sndsize = (c->flags & VB_HAS_AUDIO) ? avio_rl32(s->pb) : 0;
209             c->curstrm = !!(c->flags & VB_HAS_AUDIO);
210         }
211 
212         if (!c->curstrm) {
213             if (c->pktsize < 2LL + c->sndsize + c->gmcsize)
214                 return AVERROR_INVALIDDATA;
215 
216             size = c->pktsize - c->sndsize - c->gmcsize - 2;
217             size = ffio_limit(s->pb, size);
218             if ((ret = av_new_packet(pkt, size + c->gmcsize + 2)) < 0)
219                 return ret;
220             AV_WL16(pkt->data, c->flags);
221             if (c->gmcsize)
222                 memcpy(pkt->data + 2, c->gmc, c->gmcsize);
223             if (avio_read(s->pb, pkt->data + 2 + c->gmcsize, size) != size) {
224                 return AVERROR_INVALIDDATA;
225             }
226             pkt->stream_index = 0;
227             c->curstrm        = -1;
228         } else {
229             int pktsize = av_get_packet(s->pb, pkt, c->sndsize - 4);
230             if (pktsize < 0)
231                 return AVERROR(EIO);
232             pkt->stream_index = 1;
233             pkt->duration     = pktsize;
234             c->curstrm        = 0;
235         }
236         if (!c->cur_frame || c->curstrm)
237             pkt->flags |= AV_PKT_FLAG_KEY;
238         if (c->curstrm == -1)
239             c->cur_frame++;
240     } else {
241         int pktsize = av_get_packet(s->pb, pkt, c->block_align);
242         if (!pktsize)
243             return AVERROR_EOF;
244         if (pktsize <= 0)
245             return AVERROR(EIO);
246         pkt->duration = pktsize;
247     }
248     return pkt->size;
249 }
250 
251 const AVInputFormat ff_siff_demuxer = {
252     .name           = "siff",
253     .long_name      = NULL_IF_CONFIG_SMALL("Beam Software SIFF"),
254     .priv_data_size = sizeof(SIFFContext),
255     .read_probe     = siff_probe,
256     .read_header    = siff_read_header,
257     .read_packet    = siff_read_packet,
258     .extensions     = "vb,son",
259 };
260