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    uint32_t tag = AV_RL32(p->buf + 8);
64    /* check file header */
65    if (AV_RL32(p->buf) != TAG_SIFF ||
66        (tag != TAG_VBV1 && tag != TAG_SOUN))
67        return 0;
68    return AVPROBE_SCORE_MAX;
69}
70
71static int create_audio_stream(AVFormatContext *s, SIFFContext *c)
72{
73    AVStream *ast;
74    ast = av_new_stream(s, 0);
75    if (!ast)
76        return -1;
77    ast->codec->codec_type      = AVMEDIA_TYPE_AUDIO;
78    ast->codec->codec_id        = CODEC_ID_PCM_U8;
79    ast->codec->channels        = 1;
80    ast->codec->bits_per_coded_sample = c->bits;
81    ast->codec->sample_rate     = c->rate;
82    ast->codec->frame_size      = c->block_align;
83    av_set_pts_info(ast, 16, 1, c->rate);
84    return 0;
85}
86
87static int siff_parse_vbv1(AVFormatContext *s, SIFFContext *c, ByteIOContext *pb)
88{
89    AVStream *st;
90    int width, height;
91
92    if (get_le32(pb) != TAG_VBHD){
93        av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
94        return -1;
95    }
96    if(get_be32(pb) != 32){
97        av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
98        return -1;
99    }
100    if(get_le16(pb) != 1){
101        av_log(s, AV_LOG_ERROR, "Incorrect header version\n");
102        return -1;
103    }
104    width = get_le16(pb);
105    height = get_le16(pb);
106    url_fskip(pb, 4);
107    c->frames = get_le16(pb);
108    if(!c->frames){
109        av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
110        return -1;
111    }
112    c->bits = get_le16(pb);
113    c->rate = get_le16(pb);
114    c->block_align = c->rate * (c->bits >> 3);
115
116    url_fskip(pb, 16); //zeroes
117
118    st = av_new_stream(s, 0);
119    if (!st)
120        return -1;
121    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
122    st->codec->codec_id   = CODEC_ID_VB;
123    st->codec->codec_tag  = MKTAG('V', 'B', 'V', '1');
124    st->codec->width      = width;
125    st->codec->height     = height;
126    st->codec->pix_fmt    = PIX_FMT_PAL8;
127    av_set_pts_info(st, 16, 1, 12);
128
129    c->cur_frame = 0;
130    c->has_video = 1;
131    c->has_audio = !!c->rate;
132    c->curstrm = -1;
133    if (c->has_audio && create_audio_stream(s, c) < 0)
134        return -1;
135    return 0;
136}
137
138static int siff_parse_soun(AVFormatContext *s, SIFFContext *c, ByteIOContext *pb)
139{
140    if (get_le32(pb) != TAG_SHDR){
141        av_log(s, AV_LOG_ERROR, "Header chunk is missing\n");
142        return -1;
143    }
144    if(get_be32(pb) != 8){
145        av_log(s, AV_LOG_ERROR, "Header chunk size is incorrect\n");
146        return -1;
147    }
148    url_fskip(pb, 4); //unknown value
149    c->rate = get_le16(pb);
150    c->bits = get_le16(pb);
151    c->block_align = c->rate * (c->bits >> 3);
152    return create_audio_stream(s, c);
153}
154
155static int siff_read_header(AVFormatContext *s, AVFormatParameters *ap)
156{
157    ByteIOContext *pb = s->pb;
158    SIFFContext *c = s->priv_data;
159    uint32_t tag;
160
161    if (get_le32(pb) != TAG_SIFF)
162        return -1;
163    url_fskip(pb, 4); //ignore size
164    tag = get_le32(pb);
165
166    if (tag != TAG_VBV1 && tag != TAG_SOUN){
167        av_log(s, AV_LOG_ERROR, "Not a VBV file\n");
168        return -1;
169    }
170
171    if (tag == TAG_VBV1 && siff_parse_vbv1(s, c, pb) < 0)
172        return -1;
173    if (tag == TAG_SOUN && siff_parse_soun(s, c, pb) < 0)
174        return -1;
175    if (get_le32(pb) != MKTAG('B', 'O', 'D', 'Y')){
176        av_log(s, AV_LOG_ERROR, "'BODY' chunk is missing\n");
177        return -1;
178    }
179    url_fskip(pb, 4); //ignore size
180
181    return 0;
182}
183
184static int siff_read_packet(AVFormatContext *s, AVPacket *pkt)
185{
186    SIFFContext *c = s->priv_data;
187    int size;
188
189    if (c->has_video){
190        if (c->cur_frame >= c->frames)
191            return AVERROR(EIO);
192        if (c->curstrm == -1){
193            c->pktsize = get_le32(s->pb) - 4;
194            c->flags = get_le16(s->pb);
195            c->gmcsize = (c->flags & VB_HAS_GMC) ? 4 : 0;
196            if (c->gmcsize)
197                get_buffer(s->pb, c->gmc, c->gmcsize);
198            c->sndsize = (c->flags & VB_HAS_AUDIO) ? get_le32(s->pb): 0;
199            c->curstrm = !!(c->flags & VB_HAS_AUDIO);
200        }
201
202        if (!c->curstrm){
203            size = c->pktsize - c->sndsize;
204            if (av_new_packet(pkt, size) < 0)
205                return AVERROR(ENOMEM);
206            AV_WL16(pkt->data, c->flags);
207            if (c->gmcsize)
208                memcpy(pkt->data + 2, c->gmc, c->gmcsize);
209            get_buffer(s->pb, pkt->data + 2 + c->gmcsize, size - c->gmcsize - 2);
210            pkt->stream_index = 0;
211            c->curstrm = -1;
212        }else{
213            if (av_get_packet(s->pb, pkt, c->sndsize - 4) < 0)
214                return AVERROR(EIO);
215            pkt->stream_index = 1;
216            c->curstrm = 0;
217        }
218        if(!c->cur_frame || c->curstrm)
219            pkt->flags |= AV_PKT_FLAG_KEY;
220        if (c->curstrm == -1)
221            c->cur_frame++;
222    }else{
223        size = av_get_packet(s->pb, pkt, c->block_align);
224        if(size <= 0)
225            return AVERROR(EIO);
226    }
227    return pkt->size;
228}
229
230AVInputFormat siff_demuxer = {
231    "siff",
232    NULL_IF_CONFIG_SMALL("Beam Software SIFF"),
233    sizeof(SIFFContext),
234    siff_probe,
235    siff_read_header,
236    siff_read_packet,
237    .extensions = "vb,son"
238};
239