blob: ac567c21eb63541fadc7fd4cc77f405895dc8e88
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 | |
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->channels = 2; |
62 | ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO; |
63 | ast->codecpar->sample_rate = 22050; |
64 | avpriv_set_pts_info(ast, 16, 1, 22050); |
65 | |
66 | c->get_next = 1; |
67 | c->audio_pos = 0; |
68 | return 0; |
69 | } |
70 | |
71 | static int bmv_read_packet(AVFormatContext *s, AVPacket *pkt) |
72 | { |
73 | BMVContext *c = s->priv_data; |
74 | int type, err; |
75 | |
76 | while (c->get_next) { |
77 | if (s->pb->eof_reached) |
78 | return AVERROR_EOF; |
79 | type = avio_r8(s->pb); |
80 | if (type == BMV_NOP) |
81 | continue; |
82 | if (type == BMV_END) |
83 | return AVERROR_EOF; |
84 | c->size = avio_rl24(s->pb); |
85 | if (!c->size) |
86 | return AVERROR_INVALIDDATA; |
87 | if ((err = av_reallocp(&c->packet, c->size + 1)) < 0) |
88 | return err; |
89 | c->packet[0] = type; |
90 | if (avio_read(s->pb, c->packet + 1, c->size) != c->size) |
91 | return AVERROR(EIO); |
92 | if (type & BMV_AUDIO) { |
93 | int audio_size = c->packet[1] * 65 + 1; |
94 | if (audio_size >= c->size) { |
95 | av_log(s, AV_LOG_ERROR, "Reported audio size %d is bigger than packet size (%d)\n", |
96 | audio_size, c->size); |
97 | return AVERROR_INVALIDDATA; |
98 | } |
99 | if (av_new_packet(pkt, audio_size) < 0) |
100 | return AVERROR(ENOMEM); |
101 | memcpy(pkt->data, c->packet + 1, pkt->size); |
102 | pkt->stream_index = 1; |
103 | pkt->pts = c->audio_pos; |
104 | pkt->duration = c->packet[1] * 32; |
105 | c->audio_pos += pkt->duration; |
106 | c->get_next = 0; |
107 | return pkt->size; |
108 | } else |
109 | break; |
110 | } |
111 | if (av_new_packet(pkt, c->size + 1) < 0) |
112 | return AVERROR(ENOMEM); |
113 | pkt->stream_index = 0; |
114 | c->get_next = 1; |
115 | memcpy(pkt->data, c->packet, pkt->size); |
116 | return pkt->size; |
117 | } |
118 | |
119 | static int bmv_read_close(AVFormatContext *s) |
120 | { |
121 | BMVContext *c = s->priv_data; |
122 | |
123 | av_freep(&c->packet); |
124 | |
125 | return 0; |
126 | } |
127 | |
128 | AVInputFormat ff_bmv_demuxer = { |
129 | .name = "bmv", |
130 | .long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV"), |
131 | .priv_data_size = sizeof(BMVContext), |
132 | .read_header = bmv_read_header, |
133 | .read_packet = bmv_read_packet, |
134 | .read_close = bmv_read_close, |
135 | .extensions = "bmv", |
136 | }; |
137 |