1/**
2    Copyright (C) 2005  Michael Ahlberg, M��ns Rullg��rd
3
4    Permission is hereby granted, free of charge, to any person
5    obtaining a copy of this software and associated documentation
6    files (the "Software"), to deal in the Software without
7    restriction, including without limitation the rights to use, copy,
8    modify, merge, publish, distribute, sublicense, and/or sell copies
9    of the Software, and to permit persons to whom the Software is
10    furnished to do so, subject to the following conditions:
11
12    The above copyright notice and this permission notice shall be
13    included in all copies or substantial portions of the Software.
14
15    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
19    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22    DEALINGS IN THE SOFTWARE.
23**/
24
25#include <stdlib.h>
26#include "libavutil/intreadwrite.h"
27#include "libavcodec/bitstream.h"
28#include "libavcodec/bytestream.h"
29#include "avformat.h"
30#include "oggdec.h"
31#include "riff.h"
32
33static int
34ogm_header(AVFormatContext *s, int idx)
35{
36    struct ogg *ogg = s->priv_data;
37    struct ogg_stream *os = ogg->streams + idx;
38    AVStream *st = s->streams[idx];
39    const uint8_t *p = os->buf + os->pstart;
40    uint64_t time_unit;
41    uint64_t spu;
42    uint32_t default_len;
43
44    if(!(*p & 1))
45        return 0;
46    if(*p != 1)
47        return 1;
48
49    p++;
50
51    if(*p == 'v'){
52        int tag;
53        st->codec->codec_type = CODEC_TYPE_VIDEO;
54        p += 8;
55        tag = bytestream_get_le32(&p);
56        st->codec->codec_id = codec_get_id(codec_bmp_tags, tag);
57        st->codec->codec_tag = tag;
58    } else if (*p == 't') {
59        st->codec->codec_type = CODEC_TYPE_SUBTITLE;
60        st->codec->codec_id = CODEC_ID_TEXT;
61        p += 12;
62    } else {
63        uint8_t acid[5];
64        int cid;
65        st->codec->codec_type = CODEC_TYPE_AUDIO;
66        p += 8;
67        bytestream_get_buffer(&p, acid, 4);
68        acid[4] = 0;
69        cid = strtol(acid, NULL, 16);
70        st->codec->codec_id = codec_get_id(codec_wav_tags, cid);
71        st->need_parsing = AVSTREAM_PARSE_FULL;
72    }
73
74    p += 4;                     /* useless size field */
75
76    time_unit   = bytestream_get_le64(&p);
77    spu         = bytestream_get_le64(&p);
78    default_len = bytestream_get_le32(&p);
79
80    p += 8;                     /* buffersize + bits_per_sample */
81
82    if(st->codec->codec_type == CODEC_TYPE_VIDEO){
83        st->codec->width = bytestream_get_le32(&p);
84        st->codec->height = bytestream_get_le32(&p);
85        st->codec->time_base.den = spu * 10000000;
86        st->codec->time_base.num = time_unit;
87        st->time_base = st->codec->time_base;
88    } else {
89        st->codec->channels = bytestream_get_le16(&p);
90        p += 2;                 /* block_align */
91        st->codec->bit_rate = bytestream_get_le32(&p) * 8;
92        st->codec->sample_rate = spu * 10000000 / time_unit;
93        st->time_base.num = 1;
94        st->time_base.den = st->codec->sample_rate;
95    }
96
97    return 1;
98}
99
100static int
101ogm_dshow_header(AVFormatContext *s, int idx)
102{
103    struct ogg *ogg = s->priv_data;
104    struct ogg_stream *os = ogg->streams + idx;
105    AVStream *st = s->streams[idx];
106    uint8_t *p = os->buf + os->pstart;
107    uint32_t t;
108
109    if(!(*p & 1))
110        return 0;
111    if(*p != 1)
112        return 1;
113
114    t = AV_RL32(p + 96);
115
116    if(t == 0x05589f80){
117        st->codec->codec_type = CODEC_TYPE_VIDEO;
118        st->codec->codec_id = codec_get_id(codec_bmp_tags, AV_RL32(p + 68));
119        st->codec->time_base.den = 10000000;
120        st->codec->time_base.num = AV_RL64(p + 164);
121        st->codec->width = AV_RL32(p + 176);
122        st->codec->height = AV_RL32(p + 180);
123    } else if(t == 0x05589f81){
124        st->codec->codec_type = CODEC_TYPE_AUDIO;
125        st->codec->codec_id = codec_get_id(codec_wav_tags, AV_RL16(p + 124));
126        st->codec->channels = AV_RL16(p + 126);
127        st->codec->sample_rate = AV_RL32(p + 128);
128        st->codec->bit_rate = AV_RL32(p + 132) * 8;
129    }
130
131    return 1;
132}
133
134static int
135ogm_packet(AVFormatContext *s, int idx)
136{
137    struct ogg *ogg = s->priv_data;
138    struct ogg_stream *os = ogg->streams + idx;
139    uint8_t *p = os->buf + os->pstart;
140    int lb;
141
142    if(*p & 8)
143        os->pflags |= PKT_FLAG_KEY;
144
145    lb = ((*p & 2) << 1) | ((*p >> 6) & 3);
146    os->pstart += lb + 1;
147    os->psize -= lb + 1;
148
149    return 0;
150}
151
152const struct ogg_codec ff_ogm_video_codec = {
153    .magic = "\001video",
154    .magicsize = 6,
155    .header = ogm_header,
156    .packet = ogm_packet
157};
158
159const struct ogg_codec ff_ogm_audio_codec = {
160    .magic = "\001audio",
161    .magicsize = 6,
162    .header = ogm_header,
163    .packet = ogm_packet
164};
165
166const struct ogg_codec ff_ogm_text_codec = {
167    .magic = "\001text",
168    .magicsize = 5,
169    .header = ogm_header,
170    .packet = ogm_packet
171};
172
173const struct ogg_codec ff_ogm_old_codec = {
174    .magic = "\001Direct Show Samples embedded in Ogg",
175    .magicsize = 35,
176    .header = ogm_dshow_header,
177    .packet = ogm_packet
178};
179