mirror of https://github.com/FFmpeg/FFmpeg.git
Patch by Sisir Koppaka (sisir.koppaka at G.M!A.I!L.com) Originally committed as revision 12808 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Sisir Koppaka
17 years ago
committed by
Vitor Sessak
parent
8c2a4ddca3
commit
b64c096be9
6 changed files with 173 additions and 0 deletions
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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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* @file bfi.c |
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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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#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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vstream->codec->codec_type = CODEC_TYPE_VIDEO; |
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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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astream->codec->codec_type = CODEC_TYPE_AUDIO; |
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astream->codec->codec_id = CODEC_ID_PCM_U8; |
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astream->codec->channels = 1; |
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astream->codec->bits_per_sample = 8; |
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astream->codec->bit_rate = |
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astream->codec->sample_rate * astream->codec->bits_per_sample; |
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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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"Brute Force & Ignorance", |
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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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