1/**
2    Copyright (C) 2005  Michael Ahlberg, Måns Rullgård
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/get_bits.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
47    if(*p == 1) {
48        p++;
49
50        if(*p == 'v'){
51            int tag;
52            st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
53            p += 8;
54            tag = bytestream_get_le32(&p);
55            st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag);
56            st->codec->codec_tag = tag;
57        } else if (*p == 't') {
58            st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
59            st->codec->codec_id = CODEC_ID_TEXT;
60            p += 12;
61        } else {
62            uint8_t acid[5];
63            int cid;
64            st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
65            p += 8;
66            bytestream_get_buffer(&p, acid, 4);
67            acid[4] = 0;
68            cid = strtol(acid, NULL, 16);
69            st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, cid);
70            st->need_parsing = AVSTREAM_PARSE_FULL;
71        }
72
73        p += 4;                     /* useless size field */
74
75        time_unit   = bytestream_get_le64(&p);
76        spu         = bytestream_get_le64(&p);
77        default_len = bytestream_get_le32(&p);
78
79        p += 8;                     /* buffersize + bits_per_sample */
80
81        if(st->codec->codec_type == AVMEDIA_TYPE_VIDEO){
82            st->codec->width = bytestream_get_le32(&p);
83            st->codec->height = bytestream_get_le32(&p);
84            st->codec->time_base.den = spu * 10000000;
85            st->codec->time_base.num = time_unit;
86            st->time_base = st->codec->time_base;
87        } else {
88            st->codec->channels = bytestream_get_le16(&p);
89            p += 2;                 /* block_align */
90            st->codec->bit_rate = bytestream_get_le32(&p) * 8;
91            st->codec->sample_rate = spu * 10000000 / time_unit;
92            st->time_base.num = 1;
93            st->time_base.den = st->codec->sample_rate;
94        }
95    } else if (*p == 3) {
96        if (os->psize > 8)
97            ff_vorbis_comment(s, &st->metadata, p+7, os->psize-8);
98    }
99
100    return 1;
101}
102
103static int
104ogm_dshow_header(AVFormatContext *s, int idx)
105{
106    struct ogg *ogg = s->priv_data;
107    struct ogg_stream *os = ogg->streams + idx;
108    AVStream *st = s->streams[idx];
109    uint8_t *p = os->buf + os->pstart;
110    uint32_t t;
111
112    if(!(*p & 1))
113        return 0;
114    if(*p != 1)
115        return 1;
116
117    t = AV_RL32(p + 96);
118
119    if(t == 0x05589f80){
120        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
121        st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(p + 68));
122        st->codec->time_base.den = 10000000;
123        st->codec->time_base.num = AV_RL64(p + 164);
124        st->codec->width = AV_RL32(p + 176);
125        st->codec->height = AV_RL32(p + 180);
126    } else if(t == 0x05589f81){
127        st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
128        st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, AV_RL16(p + 124));
129        st->codec->channels = AV_RL16(p + 126);
130        st->codec->sample_rate = AV_RL32(p + 128);
131        st->codec->bit_rate = AV_RL32(p + 132) * 8;
132    }
133
134    return 1;
135}
136
137static int
138ogm_packet(AVFormatContext *s, int idx)
139{
140    struct ogg *ogg = s->priv_data;
141    struct ogg_stream *os = ogg->streams + idx;
142    uint8_t *p = os->buf + os->pstart;
143    int lb;
144
145    if(*p & 8)
146        os->pflags |= AV_PKT_FLAG_KEY;
147
148    lb = ((*p & 2) << 1) | ((*p >> 6) & 3);
149    os->pstart += lb + 1;
150    os->psize -= lb + 1;
151
152    while (lb--)
153        os->pduration += p[lb+1] << (lb*8);
154
155    return 0;
156}
157
158const struct ogg_codec ff_ogm_video_codec = {
159    .magic = "\001video",
160    .magicsize = 6,
161    .header = ogm_header,
162    .packet = ogm_packet,
163    .granule_is_start = 1,
164};
165
166const struct ogg_codec ff_ogm_audio_codec = {
167    .magic = "\001audio",
168    .magicsize = 6,
169    .header = ogm_header,
170    .packet = ogm_packet,
171    .granule_is_start = 1,
172};
173
174const struct ogg_codec ff_ogm_text_codec = {
175    .magic = "\001text",
176    .magicsize = 5,
177    .header = ogm_header,
178    .packet = ogm_packet,
179    .granule_is_start = 1,
180};
181
182const struct ogg_codec ff_ogm_old_codec = {
183    .magic = "\001Direct Show Samples embedded in Ogg",
184    .magicsize = 35,
185    .header = ogm_dshow_header,
186    .packet = ogm_packet,
187    .granule_is_start = 1,
188};
189