/* * Brute Force & Ignorance (BFI) demuxer * Copyright (c) 2008 Sisir Koppaka * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * @brief Brute Force & Ignorance (.bfi) file demuxer * @author Sisir Koppaka ( sisir.koppaka at gmail dot com ) * @see http://wiki.multimedia.cx/index.php?title=BFI */ #include "libavutil/channel_layout.h"#include "libavutil/intreadwrite.h"#include "avformat.h"#include "demux.h"#include "internal.h" typedef struct BFIContext {    int nframes;    int audio_frame;    int video_frame;    int video_size;    int avflag;} BFIContext; static int bfi_probe(const AVProbeData * p){    /* Check file header */    if (AV_RL32(p->buf) == MKTAG('B', 'F', '&', 'I'))        return AVPROBE_SCORE_MAX;    else        return 0;} static int bfi_read_header(AVFormatContext * s){    BFIContext *bfi = s->priv_data;    AVIOContext *pb = s->pb;    AVStream *vstream;    AVStream *astream;    int ret, fps, chunk_header;     /* Initialize the video codec... */    vstream = avformat_new_stream(s, NULL);    if (!vstream)        return AVERROR(ENOMEM);     /* Initialize the audio codec... */    astream = avformat_new_stream(s, NULL);    if (!astream)        return AVERROR(ENOMEM);     /* Set the total number of frames. */    avio_skip(pb, 8);    chunk_header           = avio_rl32(pb);    if (chunk_header < 3)        return AVERROR_INVALIDDATA;     bfi->nframes           = avio_rl32(pb);    if (bfi->nframes < 0)        return AVERROR_INVALIDDATA;    avio_rl32(pb);    avio_rl32(pb);    avio_rl32(pb);    fps                    = avio_rl32(pb);    avio_skip(pb, 12);    vstream->codecpar->width  = avio_rl32(pb);    vstream->codecpar->height = avio_rl32(pb);     /*Load the palette to extradata */    avio_skip(pb, 8);    ret = ff_get_extradata(s, vstream->codecpar, pb, 768);    if (ret < 0)        return ret;     astream->codecpar->sample_rate = avio_rl32(pb);    if (astream->codecpar->sample_rate <= 0) {        av_log(s, AV_LOG_ERROR, "Invalid sample rate %d\n", astream->codecpar->sample_rate);        return AVERROR_INVALIDDATA;    }     /* Set up the video codec... */    avpriv_set_pts_info(vstream, 32, 1, fps);    vstream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;    vstream->codecpar->codec_id   = AV_CODEC_ID_BFI;    vstream->codecpar->format     = AV_PIX_FMT_PAL8;    vstream->nb_frames            =    vstream->duration             = bfi->nframes;     /* Set up the audio codec now... */    astream->codecpar->codec_type      = AVMEDIA_TYPE_AUDIO;    astream->codecpar->codec_id        = AV_CODEC_ID_PCM_U8;    astream->codecpar->ch_layout       = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;    astream->codecpar->bits_per_coded_sample = 8;    astream->codecpar->bit_rate        =        (int64_t)astream->codecpar->sample_rate * astream->codecpar->bits_per_coded_sample;    avio_seek(pb, chunk_header - 3, SEEK_SET);    avpriv_set_pts_info(astream, 64, 1, astream->codecpar->sample_rate);    return 0;}  static int bfi_read_packet(AVFormatContext * s, AVPacket * pkt){    BFIContext *bfi = s->priv_data;    AVIOContext *pb = s->pb;    int ret, audio_offset, video_offset, chunk_size, audio_size = 0;    if (bfi->nframes == 0 || avio_feof(pb)) {        return AVERROR_EOF;    }     /* If all previous chunks were completely read, then find a new one... */    if (!bfi->avflag) {        uint32_t state = 0;        while(state != MKTAG('S','A','V','I')){            if (avio_feof(pb))                return AVERROR(EIO);            state = 256*state + avio_r8(pb);        }        /* Now that the chunk's location is confirmed, we proceed... */        chunk_size      = avio_rl32(pb);        avio_rl32(pb);        audio_offset    = avio_rl32(pb);        avio_rl32(pb);        video_offset    = avio_rl32(pb);        if (audio_offset < 0 || video_offset < audio_offset || chunk_size < video_offset) {            av_log(s, AV_LOG_ERROR, "Invalid audio/video offsets or chunk size\n");            return AVERROR_INVALIDDATA;        }        audio_size      = video_offset - audio_offset;        bfi->video_size = chunk_size - video_offset;         //Tossing an audio packet at the audio decoder.        ret = av_get_packet(pb, pkt, audio_size);        if (ret < 0)            return ret;         pkt->pts          = bfi->audio_frame;        bfi->audio_frame += ret;    } else if (bfi->video_size > 0) {         //Tossing a video packet at the video decoder.        ret = av_get_packet(pb, pkt, bfi->video_size);        if (ret < 0)            return ret;         pkt->pts          = bfi->video_frame;        bfi->video_frame += ret / bfi->video_size;         /* One less frame to read. A cursory decrement. */        bfi->nframes--;    } else {        /* Empty video packet */        ret = AVERROR(EAGAIN);    }     bfi->avflag       = !bfi->avflag;    pkt->stream_index = bfi->avflag;    return ret;} const FFInputFormat ff_bfi_demuxer = {    .p.name         = "bfi",    .p.long_name    = NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"),    .priv_data_size = sizeof(BFIContext),    .read_probe     = bfi_probe,    .read_header    = bfi_read_header,    .read_packet    = bfi_read_packet,};