2 * Brute Force & Ignorance (BFI) demuxer
3 * Copyright (c) 2008 Sisir Koppaka
5 * This file is part of FFmpeg.
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.
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.
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
24 * @brief Brute Force & Ignorance (.bfi) file demuxer
25 * @author Sisir Koppaka ( sisir.koppaka at gmail dot com )
26 * @sa http://wiki.multimedia.cx/index.php?title=BFI
31 typedef struct BFIContext {
39 static int bfi_probe(AVProbeData * p)
41 /* Check file header */
42 if (AV_RL32(p->buf) == MKTAG('B', 'F', '&', 'I'))
43 return AVPROBE_SCORE_MAX;
48 static int bfi_read_header(AVFormatContext * s, AVFormatParameters * ap)
50 BFIContext *bfi = s->priv_data;
51 ByteIOContext *pb = s->pb;
54 int fps, chunk_header;
56 /* Initialize the video codec... */
57 vstream = av_new_stream(s, 0);
59 return AVERROR(ENOMEM);
61 /* Initialize the audio codec... */
62 astream = av_new_stream(s, 0);
64 return AVERROR(ENOMEM);
66 /* Set the total number of frames. */
68 chunk_header = get_le32(pb);
69 bfi->nframes = get_le32(pb);
75 vstream->codec->width = get_le32(pb);
76 vstream->codec->height = get_le32(pb);
78 /*Load the palette to extradata */
80 vstream->codec->extradata = av_malloc(768);
81 vstream->codec->extradata_size = 768;
82 get_buffer(pb, vstream->codec->extradata,
83 vstream->codec->extradata_size);
85 astream->codec->sample_rate = get_le32(pb);
87 /* Set up the video codec... */
88 av_set_pts_info(vstream, 32, 1, fps);
89 vstream->codec->codec_type = CODEC_TYPE_VIDEO;
90 vstream->codec->codec_id = CODEC_ID_BFI;
91 vstream->codec->pix_fmt = PIX_FMT_PAL8;
93 /* Set up the audio codec now... */
94 astream->codec->codec_type = CODEC_TYPE_AUDIO;
95 astream->codec->codec_id = CODEC_ID_PCM_U8;
96 astream->codec->channels = 1;
97 astream->codec->bits_per_sample = 8;
98 astream->codec->bit_rate =
99 astream->codec->sample_rate * astream->codec->bits_per_sample;
100 url_fseek(pb, chunk_header - 3, SEEK_SET);
101 av_set_pts_info(astream, 64, 1, astream->codec->sample_rate);
106 static int bfi_read_packet(AVFormatContext * s, AVPacket * pkt)
108 BFIContext *bfi = s->priv_data;
109 ByteIOContext *pb = s->pb;
110 int ret, audio_offset, video_offset, chunk_size, audio_size = 0;
111 if (bfi->nframes == 0 || url_feof(pb)) {
115 /* If all previous chunks were completely read, then find a new one... */
118 while(state != MKTAG('S','A','V','I')){
121 state = 256*state + get_byte(pb);
123 /* Now that the chunk's location is confirmed, we proceed... */
124 chunk_size = get_le32(pb);
126 audio_offset = get_le32(pb);
128 video_offset = get_le32(pb);
129 audio_size = video_offset - audio_offset;
130 bfi->video_size = chunk_size - video_offset;
132 //Tossing an audio packet at the audio decoder.
133 ret = av_get_packet(pb, pkt, audio_size);
137 pkt->pts = bfi->audio_frame;
138 bfi->audio_frame += ret;
143 //Tossing a video packet at the video decoder.
144 ret = av_get_packet(pb, pkt, bfi->video_size);
148 pkt->pts = bfi->video_frame;
149 bfi->video_frame += ret / bfi->video_size;
151 /* One less frame to read. A cursory decrement. */
155 bfi->avflag = !bfi->avflag;
156 pkt->stream_index = bfi->avflag;
160 AVInputFormat bfi_demuxer = {
162 NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"),