Commit | Line | Data |
---|---|---|
2ba45a60 DM |
1 | /* |
2 | * Brute Force & Ignorance (BFI) demuxer | |
3 | * Copyright (c) 2008 Sisir Koppaka | |
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 | /** | |
23 | * @file | |
24 | * @brief Brute Force & Ignorance (.bfi) file demuxer | |
25 | * @author Sisir Koppaka ( sisir.koppaka at gmail dot com ) | |
26 | * @see http://wiki.multimedia.cx/index.php?title=BFI | |
27 | */ | |
28 | ||
29 | #include "libavutil/channel_layout.h" | |
30 | #include "libavutil/intreadwrite.h" | |
31 | #include "avformat.h" | |
32 | #include "internal.h" | |
33 | ||
34 | typedef struct BFIContext { | |
35 | int nframes; | |
36 | int audio_frame; | |
37 | int video_frame; | |
38 | int video_size; | |
39 | int avflag; | |
40 | } BFIContext; | |
41 | ||
42 | static int bfi_probe(AVProbeData * p) | |
43 | { | |
44 | /* Check file header */ | |
45 | if (AV_RL32(p->buf) == MKTAG('B', 'F', '&', 'I')) | |
46 | return AVPROBE_SCORE_MAX; | |
47 | else | |
48 | return 0; | |
49 | } | |
50 | ||
51 | static int bfi_read_header(AVFormatContext * s) | |
52 | { | |
53 | BFIContext *bfi = s->priv_data; | |
54 | AVIOContext *pb = s->pb; | |
55 | AVStream *vstream; | |
56 | AVStream *astream; | |
57 | int fps, chunk_header; | |
58 | ||
59 | /* Initialize the video codec... */ | |
60 | vstream = avformat_new_stream(s, NULL); | |
61 | if (!vstream) | |
62 | return AVERROR(ENOMEM); | |
63 | ||
64 | /* Initialize the audio codec... */ | |
65 | astream = avformat_new_stream(s, NULL); | |
66 | if (!astream) | |
67 | return AVERROR(ENOMEM); | |
68 | ||
69 | /* Set the total number of frames. */ | |
70 | avio_skip(pb, 8); | |
71 | chunk_header = avio_rl32(pb); | |
72 | bfi->nframes = avio_rl32(pb); | |
73 | avio_rl32(pb); | |
74 | avio_rl32(pb); | |
75 | avio_rl32(pb); | |
76 | fps = avio_rl32(pb); | |
77 | avio_skip(pb, 12); | |
78 | vstream->codec->width = avio_rl32(pb); | |
79 | vstream->codec->height = avio_rl32(pb); | |
80 | ||
81 | /*Load the palette to extradata */ | |
82 | avio_skip(pb, 8); | |
83 | vstream->codec->extradata = av_malloc(768); | |
84 | if (!vstream->codec->extradata) | |
85 | return AVERROR(ENOMEM); | |
86 | vstream->codec->extradata_size = 768; | |
87 | avio_read(pb, vstream->codec->extradata, | |
88 | vstream->codec->extradata_size); | |
89 | ||
90 | astream->codec->sample_rate = avio_rl32(pb); | |
91 | ||
92 | /* Set up the video codec... */ | |
93 | avpriv_set_pts_info(vstream, 32, 1, fps); | |
94 | vstream->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
95 | vstream->codec->codec_id = AV_CODEC_ID_BFI; | |
96 | vstream->codec->pix_fmt = AV_PIX_FMT_PAL8; | |
97 | vstream->nb_frames = | |
98 | vstream->duration = bfi->nframes; | |
99 | ||
100 | /* Set up the audio codec now... */ | |
101 | astream->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
102 | astream->codec->codec_id = AV_CODEC_ID_PCM_U8; | |
103 | astream->codec->channels = 1; | |
104 | astream->codec->channel_layout = AV_CH_LAYOUT_MONO; | |
105 | astream->codec->bits_per_coded_sample = 8; | |
106 | astream->codec->bit_rate = | |
107 | astream->codec->sample_rate * astream->codec->bits_per_coded_sample; | |
108 | avio_seek(pb, chunk_header - 3, SEEK_SET); | |
109 | avpriv_set_pts_info(astream, 64, 1, astream->codec->sample_rate); | |
110 | return 0; | |
111 | } | |
112 | ||
113 | ||
114 | static int bfi_read_packet(AVFormatContext * s, AVPacket * pkt) | |
115 | { | |
116 | BFIContext *bfi = s->priv_data; | |
117 | AVIOContext *pb = s->pb; | |
118 | int ret, audio_offset, video_offset, chunk_size, audio_size = 0; | |
119 | if (bfi->nframes == 0 || avio_feof(pb)) { | |
120 | return AVERROR_EOF; | |
121 | } | |
122 | ||
123 | /* If all previous chunks were completely read, then find a new one... */ | |
124 | if (!bfi->avflag) { | |
125 | uint32_t state = 0; | |
126 | while(state != MKTAG('S','A','V','I')){ | |
127 | if (avio_feof(pb)) | |
128 | return AVERROR(EIO); | |
129 | state = 256*state + avio_r8(pb); | |
130 | } | |
131 | /* Now that the chunk's location is confirmed, we proceed... */ | |
132 | chunk_size = avio_rl32(pb); | |
133 | avio_rl32(pb); | |
134 | audio_offset = avio_rl32(pb); | |
135 | avio_rl32(pb); | |
136 | video_offset = avio_rl32(pb); | |
137 | audio_size = video_offset - audio_offset; | |
138 | bfi->video_size = chunk_size - video_offset; | |
139 | if (audio_size < 0 || bfi->video_size < 0) { | |
140 | av_log(s, AV_LOG_ERROR, "Invalid audio/video offsets or chunk size\n"); | |
141 | return AVERROR_INVALIDDATA; | |
142 | } | |
143 | ||
144 | //Tossing an audio packet at the audio decoder. | |
145 | ret = av_get_packet(pb, pkt, audio_size); | |
146 | if (ret < 0) | |
147 | return ret; | |
148 | ||
149 | pkt->pts = bfi->audio_frame; | |
150 | bfi->audio_frame += ret; | |
151 | } else if (bfi->video_size > 0) { | |
152 | ||
153 | //Tossing a video packet at the video decoder. | |
154 | ret = av_get_packet(pb, pkt, bfi->video_size); | |
155 | if (ret < 0) | |
156 | return ret; | |
157 | ||
158 | pkt->pts = bfi->video_frame; | |
159 | bfi->video_frame += ret / bfi->video_size; | |
160 | ||
161 | /* One less frame to read. A cursory decrement. */ | |
162 | bfi->nframes--; | |
163 | } else { | |
164 | /* Empty video packet */ | |
165 | ret = AVERROR(EAGAIN); | |
166 | } | |
167 | ||
168 | bfi->avflag = !bfi->avflag; | |
169 | pkt->stream_index = bfi->avflag; | |
170 | return ret; | |
171 | } | |
172 | ||
173 | AVInputFormat ff_bfi_demuxer = { | |
174 | .name = "bfi", | |
175 | .long_name = NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"), | |
176 | .priv_data_size = sizeof(BFIContext), | |
177 | .read_probe = bfi_probe, | |
178 | .read_header = bfi_read_header, | |
179 | .read_packet = bfi_read_packet, | |
180 | }; |