1 /*
2 * Discworld II BMV demuxer
3 * Copyright (c) 2011 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 "avformat.h"
24 #include "internal.h"
25
26 enum BMVFlags {
27 BMV_NOP = 0,
28 BMV_END,
29 BMV_DELTA,
30 BMV_INTRA,
31
32 BMV_AUDIO = 0x20,
33 };
34
35 typedef struct BMVContext {
36 uint8_t *packet;
37 int size;
38 int get_next;
39 int64_t audio_pos;
40 } BMVContext;
41
bmv_read_header(AVFormatContext * s)42 static int bmv_read_header(AVFormatContext *s)
43 {
44 AVStream *st, *ast;
45 BMVContext *c = s->priv_data;
46
47 st = avformat_new_stream(s, 0);
48 if (!st)
49 return AVERROR(ENOMEM);
50 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
51 st->codecpar->codec_id = AV_CODEC_ID_BMV_VIDEO;
52 st->codecpar->width = 640;
53 st->codecpar->height = 429;
54 st->codecpar->format = AV_PIX_FMT_PAL8;
55 avpriv_set_pts_info(st, 16, 1, 12);
56 ast = avformat_new_stream(s, 0);
57 if (!ast)
58 return AVERROR(ENOMEM);
59 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
60 ast->codecpar->codec_id = AV_CODEC_ID_BMV_AUDIO;
61 ast->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
62 ast->codecpar->sample_rate = 22050;
63 avpriv_set_pts_info(ast, 16, 1, 22050);
64
65 c->get_next = 1;
66 c->audio_pos = 0;
67 return 0;
68 }
69
bmv_read_packet(AVFormatContext * s,AVPacket * pkt)70 static int bmv_read_packet(AVFormatContext *s, AVPacket *pkt)
71 {
72 BMVContext *c = s->priv_data;
73 int type, err;
74
75 while (c->get_next) {
76 if (s->pb->eof_reached)
77 return AVERROR_EOF;
78 type = avio_r8(s->pb);
79 if (type == BMV_NOP)
80 continue;
81 if (type == BMV_END)
82 return AVERROR_EOF;
83 c->size = avio_rl24(s->pb);
84 if (!c->size)
85 return AVERROR_INVALIDDATA;
86 if ((err = av_reallocp(&c->packet, c->size + 1)) < 0)
87 return err;
88 c->packet[0] = type;
89 if (avio_read(s->pb, c->packet + 1, c->size) != c->size)
90 return AVERROR(EIO);
91 if (type & BMV_AUDIO) {
92 int audio_size = c->packet[1] * 65 + 1;
93 if (audio_size >= c->size) {
94 av_log(s, AV_LOG_ERROR, "Reported audio size %d is bigger than packet size (%d)\n",
95 audio_size, c->size);
96 return AVERROR_INVALIDDATA;
97 }
98 if ((err = av_new_packet(pkt, audio_size)) < 0)
99 return err;
100 memcpy(pkt->data, c->packet + 1, pkt->size);
101 pkt->stream_index = 1;
102 pkt->pts = c->audio_pos;
103 pkt->duration = c->packet[1] * 32;
104 c->audio_pos += pkt->duration;
105 c->get_next = 0;
106 return pkt->size;
107 } else
108 break;
109 }
110 if ((err = av_new_packet(pkt, c->size + 1)) < 0)
111 return err;
112 pkt->stream_index = 0;
113 c->get_next = 1;
114 memcpy(pkt->data, c->packet, pkt->size);
115 return pkt->size;
116 }
117
bmv_read_close(AVFormatContext * s)118 static int bmv_read_close(AVFormatContext *s)
119 {
120 BMVContext *c = s->priv_data;
121
122 av_freep(&c->packet);
123
124 return 0;
125 }
126
127 const AVInputFormat ff_bmv_demuxer = {
128 .name = "bmv",
129 .long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV"),
130 .priv_data_size = sizeof(BMVContext),
131 .read_header = bmv_read_header,
132 .read_packet = bmv_read_packet,
133 .read_close = bmv_read_close,
134 .extensions = "bmv",
135 };
136