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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 "demux.h" | ||
25 | #include "internal.h" | ||
26 | |||
27 | enum BMVFlags { | ||
28 | BMV_NOP = 0, | ||
29 | BMV_END, | ||
30 | BMV_DELTA, | ||
31 | BMV_INTRA, | ||
32 | |||
33 | BMV_AUDIO = 0x20, | ||
34 | }; | ||
35 | |||
36 | typedef struct BMVContext { | ||
37 | uint8_t *packet; | ||
38 | int size; | ||
39 | int get_next; | ||
40 | int64_t audio_pos; | ||
41 | } BMVContext; | ||
42 | |||
43 | 2 | static int bmv_read_header(AVFormatContext *s) | |
44 | { | ||
45 | AVStream *st, *ast; | ||
46 | 2 | BMVContext *c = s->priv_data; | |
47 | |||
48 | 2 | st = avformat_new_stream(s, 0); | |
49 |
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2 | if (!st) |
50 | ✗ | return AVERROR(ENOMEM); | |
51 | 2 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
52 | 2 | st->codecpar->codec_id = AV_CODEC_ID_BMV_VIDEO; | |
53 | 2 | st->codecpar->width = 640; | |
54 | 2 | st->codecpar->height = 429; | |
55 | 2 | st->codecpar->format = AV_PIX_FMT_PAL8; | |
56 | 2 | avpriv_set_pts_info(st, 16, 1, 12); | |
57 | 2 | ast = avformat_new_stream(s, 0); | |
58 |
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2 | if (!ast) |
59 | ✗ | return AVERROR(ENOMEM); | |
60 | 2 | ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
61 | 2 | ast->codecpar->codec_id = AV_CODEC_ID_BMV_AUDIO; | |
62 | 2 | ast->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO; | |
63 | 2 | ast->codecpar->sample_rate = 22050; | |
64 | 2 | avpriv_set_pts_info(ast, 16, 1, 22050); | |
65 | |||
66 | 2 | c->get_next = 1; | |
67 | 2 | c->audio_pos = 0; | |
68 | 2 | return 0; | |
69 | } | ||
70 | |||
71 | 88 | static int bmv_read_packet(AVFormatContext *s, AVPacket *pkt) | |
72 | { | ||
73 | 88 | BMVContext *c = s->priv_data; | |
74 | int type, err; | ||
75 | |||
76 |
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88 | while (c->get_next) { |
77 |
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46 | if (s->pb->eof_reached) |
78 | 2 | return AVERROR_EOF; | |
79 | 44 | type = avio_r8(s->pb); | |
80 |
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44 | if (type == BMV_NOP) |
81 | ✗ | continue; | |
82 |
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44 | if (type == BMV_END) |
83 | ✗ | return AVERROR_EOF; | |
84 | 44 | c->size = avio_rl24(s->pb); | |
85 |
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44 | if (!c->size) |
86 | ✗ | return AVERROR_INVALIDDATA; | |
87 |
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44 | if ((err = av_reallocp(&c->packet, c->size + 1)) < 0) |
88 | ✗ | return err; | |
89 | 44 | c->packet[0] = type; | |
90 |
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44 | if (avio_read(s->pb, c->packet + 1, c->size) != c->size) |
91 | 2 | return AVERROR(EIO); | |
92 |
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42 | if (type & BMV_AUDIO) { |
93 | 42 | int audio_size = c->packet[1] * 65 + 1; | |
94 |
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42 | 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 |
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42 | if ((err = av_new_packet(pkt, audio_size)) < 0) |
100 | ✗ | return err; | |
101 | 42 | memcpy(pkt->data, c->packet + 1, pkt->size); | |
102 | 42 | pkt->stream_index = 1; | |
103 | 42 | pkt->pts = c->audio_pos; | |
104 | 42 | pkt->duration = c->packet[1] * 32; | |
105 | 42 | c->audio_pos += pkt->duration; | |
106 | 42 | c->get_next = 0; | |
107 | 42 | return pkt->size; | |
108 | } else | ||
109 | ✗ | break; | |
110 | } | ||
111 |
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42 | if ((err = av_new_packet(pkt, c->size + 1)) < 0) |
112 | ✗ | return err; | |
113 | 42 | pkt->stream_index = 0; | |
114 | 42 | c->get_next = 1; | |
115 | 42 | memcpy(pkt->data, c->packet, pkt->size); | |
116 | 42 | return pkt->size; | |
117 | } | ||
118 | |||
119 | 2 | static int bmv_read_close(AVFormatContext *s) | |
120 | { | ||
121 | 2 | BMVContext *c = s->priv_data; | |
122 | |||
123 | 2 | av_freep(&c->packet); | |
124 | |||
125 | 2 | return 0; | |
126 | } | ||
127 | |||
128 | const FFInputFormat ff_bmv_demuxer = { | ||
129 | .p.name = "bmv", | ||
130 | .p.long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV"), | ||
131 | .p.extensions = "bmv", | ||
132 | .priv_data_size = sizeof(BMVContext), | ||
133 | .read_header = bmv_read_header, | ||
134 | .read_packet = bmv_read_packet, | ||
135 | .read_close = bmv_read_close, | ||
136 | }; | ||
137 |