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/intreadwrite.h"
23#include "avformat.h"
24
25enum SIFFTags{
26    TAG_SIFF = MKTAG('S', 'I', 'F', 'F'),
27    TAG_BODY = MKTAG('B', 'O', 'D', 'Y'),
28    TAG_VBHD = MKTAG('V', 'B', 'H', 'D'),
29    TAG_SHDR = MKTAG('S', 'H', 'D', 'R'),
30    TAG_VBV1 = MKTAG('V', 'B', 'V', '1'),
31    TAG_SOUN = MKTAG('S', 'O', 'U', 'N'),
32};
33
34enum VBFlags{
35    VB_HAS_GMC     = 0x01,
36    VB_HAS_AUDIO   = 0x04,
37    VB_HAS_VIDEO   = 0x08,
38    VB_HAS_PALETTE = 0x10,
39    VB_HAS_LENGTH  = 0x20
40};
41
42typedef struct SIFFContext{
43    int frames;
44    int cur_frame;
45    int rate;
46    int bits;
47    int block_align;
48
49    int has_video;
50    int has_audio;
51
52    int curstrm;
53    int pktsize;
54    int gmcsize;
55    int sndsize;
56
57    int flags;
58    uint8_t gmc[4];
59}SIFFContext;
60
61static int siff_probe(AVProbeData *p)
62{
63    /* check file header */
64    if (AV_RL32(p->buf) == TAG_SIFF)
65        return AVPROBE_SCORE_MAX;
66    else
67        return 0;
68}
69
70static int create_audio_stream(AVFormatContext *s, SIFFContext *c)
71{
72    AVStream *ast;
73    ast = av_new_stream(s, 0);
74    if (!ast)
75        return -1;
76    ast->codec->codec_type      = CODEC_TYPE_AUDIO;
77    ast->codec->codec_id        = CODEC_ID_PCM_U8;
78    ast->codec->channels        = 1;
79    ast->codec->bits_per_coded_sample = c->bits;
80    ast->codec->sample_rate     = c->rate;
81    ast->codec->frame_size      = c->block_align;
82    av_set_pts_info(ast, 16, 1, c->rate);
83    return 0;
84}
85
86static int siff_parse_vbv1(AVFormatContext *s, SIFFContext *c, ByteIOContext *pb)
87{
88    AVStream *st;
89    int width, height;
90
91    if (get_le32(pb) != TAG_VBHD){
92        av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
93        return -1;
94    }
95    if(get_be32(pb) != 32){
96        av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
97        return -1;
98    }
99    if(get_le16(pb) != 1){
100        av_log(s, AV_LOG_ERROR, "Incorrect header version\n");
101        return -1;
102    }
103    width = get_le16(pb);
104    height = get_le16(pb);
105    url_fskip(pb, 4);
106    c->frames = get_le16(pb);
107    if(!c->frames){
108        av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
109        return -1;
110    }
111    c->bits = get_le16(pb);
112    c->rate = get_le16(pb);
113    c->block_align = c->rate * (c->bits >> 3);
114
115    url_fskip(pb, 16); //zeroes
116
117    st = av_new_stream(s, 0);
118    if (!st)
119        return -1;
120    st->codec->codec_type = CODEC_TYPE_VIDEO;
121    st->codec->codec_id   = CODEC_ID_VB;
122    st->codec->codec_tag  = MKTAG('V', 'B', 'V', '1');
123    st->codec->width      = width;
124    st->codec->height     = height;
125    st->codec->pix_fmt    = PIX_FMT_PAL8;
126    av_set_pts_info(st, 16, 1, 12);
127
128    c->cur_frame = 0;
129    c->has_video = 1;
130    c->has_audio = !!c->rate;
131    c->curstrm = -1;
132    if (c->has_audio && create_audio_stream(s, c) < 0)
133        return -1;
134    return 0;
135}
136
137static int siff_parse_soun(AVFormatContext *s, SIFFContext *c, ByteIOContext *pb)
138{
139    if (get_le32(pb) != TAG_SHDR){
140        av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
141        return -1;
142    }
143    if(get_be32(pb) != 8){
144        av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
145        return -1;
146    }
147    url_fskip(pb, 4); //unknown value
148    c->rate = get_le16(pb);
149    c->bits = get_le16(pb);
150    c->block_align = c->rate * (c->bits >> 3);
151    return create_audio_stream(s, c);
152}
153
154static int siff_read_header(AVFormatContext *s, AVFormatParameters *ap)
155{
156    ByteIOContext *pb = s->pb;
157    SIFFContext *c = s->priv_data;
158    uint32_t tag;
159
160    if (get_le32(pb) != TAG_SIFF)
161        return -1;
162    url_fskip(pb, 4); //ignore size
163    tag = get_le32(pb);
164
165    if (tag != TAG_VBV1 && tag != TAG_SOUN){
166        av_log(s, AV_LOG_ERROR, "Not a VBV file\n");
167        return -1;
168    }
169
170    if (tag == TAG_VBV1 && siff_parse_vbv1(s, c, pb) < 0)
171        return -1;
172    if (tag == TAG_SOUN && siff_parse_soun(s, c, pb) < 0)
173        return -1;
174    if (get_le32(pb) != MKTAG('B', 'O', 'D', 'Y')){
175        av_log(s, AV_LOG_ERROR, "'BODY' chunk is missing\n");
176        return -1;
177    }
178    url_fskip(pb, 4); //ignore size
179
180    return 0;
181}
182
183static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
184{
185    SIFFContext *c = s->priv_data;
186    int size;
187
188    if (c->has_video){
189        if (c->cur_frame >= c->frames)
190            return AVERROR(EIO);
191        if (c->curstrm == -1){
192            c->pktsize = get_le32(s->pb) - 4;
193            c->flags = get_le16(s->pb);
194            c->gmcsize = (c->flags & VB_HAS_GMC) ? 4 : 0;
195            if (c->gmcsize)
196                get_buffer(s->pb, c->gmc, c->gmcsize);
197            c->sndsize = (c->flags & VB_HAS_AUDIO) ? get_le32(s->pb): 0;
198            c->curstrm = !!(c->flags & VB_HAS_AUDIO);
199        }
200
201        if (!c->curstrm){
202            size = c->pktsize - c->sndsize;
203            if (av_new_packet(pkt, size) < 0)
204                return AVERROR(ENOMEM);
205            AV_WL16(pkt->data, c->flags);
206            if (c->gmcsize)
207                memcpy(pkt->data + 2, c->gmc, c->gmcsize);
208            get_buffer(s->pb, pkt->data + 2 + c->gmcsize, size - c->gmcsize - 2);
209            pkt->stream_index = 0;
210            c->curstrm = -1;
211        }else{
212            if (av_get_packet(s->pb, pkt, c->sndsize - 4) < 0)
213                return AVERROR(EIO);
214            pkt->stream_index = 1;
215            c->curstrm = 0;
216        }
217        if(!c->cur_frame || c->curstrm)
218            pkt->flags |= PKT_FLAG_KEY;
219        if (c->curstrm == -1)
220            c->cur_frame++;
221    }else{
222        size = av_get_packet(s->pb, pkt, c->block_align);
223        if(size <= 0)
224            return AVERROR(EIO);
225    }
226    return pkt->size;
227}
228
229AVInputFormat siff_demuxer = {
230    "siff",
231    NULL_IF_CONFIG_SMALL("Beam Software SIFF"),
232    sizeof(SIFFContext),
233    siff_probe,
234    siff_read_header,
235    siff_read_packet,
236    .extensions = "vb,son"
237};
238