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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->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
51 | st->codec->codec_id = AV_CODEC_ID_BMV_VIDEO; | |
52 | st->codec->width = 640; | |
53 | st->codec->height = 429; | |
54 | st->codec->pix_fmt = 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->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
60 | ast->codec->codec_id = AV_CODEC_ID_BMV_AUDIO; | |
61 | ast->codec->channels = 2; | |
62 | ast->codec->channel_layout = AV_CH_LAYOUT_STEREO; | |
63 | ast->codec->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 | }; |