2008-04-13 21:06:31 +00:00
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/*
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* Brute Force & Ignorance (BFI) demuxer
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* Copyright (c) 2008 Sisir Koppaka
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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2010-04-20 14:45:34 +00:00
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* @file
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2008-04-13 21:06:31 +00:00
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* @brief Brute Force & Ignorance (.bfi) file demuxer
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* @author Sisir Koppaka ( sisir.koppaka at gmail dot com )
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* @sa http://wiki.multimedia.cx/index.php?title=BFI
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*/
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2009-01-11 22:19:48 +00:00
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#include "libavutil/intreadwrite.h"
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2008-04-13 21:06:31 +00:00
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#include "avformat.h"
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typedef struct BFIContext {
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int nframes;
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int audio_frame;
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int video_frame;
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int video_size;
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int avflag;
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} BFIContext;
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static int bfi_probe(AVProbeData * p)
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{
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/* Check file header */
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if (AV_RL32(p->buf) == MKTAG('B', 'F', '&', 'I'))
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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static int bfi_read_header(AVFormatContext * s, AVFormatParameters * ap)
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{
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BFIContext *bfi = s->priv_data;
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ByteIOContext *pb = s->pb;
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AVStream *vstream;
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AVStream *astream;
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int fps, chunk_header;
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/* Initialize the video codec... */
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vstream = av_new_stream(s, 0);
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if (!vstream)
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return AVERROR(ENOMEM);
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/* Initialize the audio codec... */
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astream = av_new_stream(s, 0);
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if (!astream)
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return AVERROR(ENOMEM);
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/* Set the total number of frames. */
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url_fskip(pb, 8);
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chunk_header = get_le32(pb);
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bfi->nframes = get_le32(pb);
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get_le32(pb);
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get_le32(pb);
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get_le32(pb);
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fps = get_le32(pb);
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url_fskip(pb, 12);
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vstream->codec->width = get_le32(pb);
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vstream->codec->height = get_le32(pb);
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/*Load the palette to extradata */
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url_fskip(pb, 8);
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vstream->codec->extradata = av_malloc(768);
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vstream->codec->extradata_size = 768;
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get_buffer(pb, vstream->codec->extradata,
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vstream->codec->extradata_size);
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astream->codec->sample_rate = get_le32(pb);
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/* Set up the video codec... */
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av_set_pts_info(vstream, 32, 1, fps);
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2010-03-30 23:30:55 +00:00
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vstream->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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2008-04-13 21:06:31 +00:00
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vstream->codec->codec_id = CODEC_ID_BFI;
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vstream->codec->pix_fmt = PIX_FMT_PAL8;
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/* Set up the audio codec now... */
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2010-03-30 23:30:55 +00:00
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astream->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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2008-04-13 21:06:31 +00:00
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astream->codec->codec_id = CODEC_ID_PCM_U8;
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astream->codec->channels = 1;
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2008-09-08 14:24:59 +00:00
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astream->codec->bits_per_coded_sample = 8;
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2008-04-13 21:06:31 +00:00
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astream->codec->bit_rate =
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2008-09-08 14:24:59 +00:00
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astream->codec->sample_rate * astream->codec->bits_per_coded_sample;
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2008-04-13 21:06:31 +00:00
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url_fseek(pb, chunk_header - 3, SEEK_SET);
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av_set_pts_info(astream, 64, 1, astream->codec->sample_rate);
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return 0;
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}
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static int bfi_read_packet(AVFormatContext * s, AVPacket * pkt)
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{
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BFIContext *bfi = s->priv_data;
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ByteIOContext *pb = s->pb;
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int ret, audio_offset, video_offset, chunk_size, audio_size = 0;
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if (bfi->nframes == 0 || url_feof(pb)) {
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return AVERROR(EIO);
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}
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/* If all previous chunks were completely read, then find a new one... */
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if (!bfi->avflag) {
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uint32_t state = 0;
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while(state != MKTAG('S','A','V','I')){
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if (url_feof(pb))
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return AVERROR(EIO);
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state = 256*state + get_byte(pb);
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}
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/* Now that the chunk's location is confirmed, we proceed... */
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chunk_size = get_le32(pb);
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get_le32(pb);
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audio_offset = get_le32(pb);
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get_le32(pb);
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video_offset = get_le32(pb);
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audio_size = video_offset - audio_offset;
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bfi->video_size = chunk_size - video_offset;
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//Tossing an audio packet at the audio decoder.
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ret = av_get_packet(pb, pkt, audio_size);
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if (ret < 0)
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return ret;
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pkt->pts = bfi->audio_frame;
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bfi->audio_frame += ret;
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}
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else {
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//Tossing a video packet at the video decoder.
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ret = av_get_packet(pb, pkt, bfi->video_size);
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if (ret < 0)
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return ret;
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pkt->pts = bfi->video_frame;
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bfi->video_frame += ret / bfi->video_size;
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/* One less frame to read. A cursory decrement. */
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bfi->nframes--;
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}
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bfi->avflag = !bfi->avflag;
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pkt->stream_index = bfi->avflag;
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return ret;
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}
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AVInputFormat bfi_demuxer = {
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"bfi",
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2008-06-03 16:20:54 +00:00
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NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"),
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2008-04-13 21:06:31 +00:00
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sizeof(BFIContext),
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bfi_probe,
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bfi_read_header,
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bfi_read_packet,
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};
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