0,0 → 1,180 |
/* |
* 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 "internal.h" |
|
typedef struct BFIContext { |
int nframes; |
int audio_frame; |
int video_frame; |
int video_size; |
int avflag; |
} BFIContext; |
|
static int bfi_probe(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 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); |
bfi->nframes = avio_rl32(pb); |
avio_rl32(pb); |
avio_rl32(pb); |
avio_rl32(pb); |
fps = avio_rl32(pb); |
avio_skip(pb, 12); |
vstream->codec->width = avio_rl32(pb); |
vstream->codec->height = avio_rl32(pb); |
|
/*Load the palette to extradata */ |
avio_skip(pb, 8); |
vstream->codec->extradata = av_malloc(768); |
if (!vstream->codec->extradata) |
return AVERROR(ENOMEM); |
vstream->codec->extradata_size = 768; |
avio_read(pb, vstream->codec->extradata, |
vstream->codec->extradata_size); |
|
astream->codec->sample_rate = avio_rl32(pb); |
|
/* Set up the video codec... */ |
avpriv_set_pts_info(vstream, 32, 1, fps); |
vstream->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
vstream->codec->codec_id = AV_CODEC_ID_BFI; |
vstream->codec->pix_fmt = AV_PIX_FMT_PAL8; |
vstream->nb_frames = |
vstream->duration = bfi->nframes; |
|
/* Set up the audio codec now... */ |
astream->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
astream->codec->codec_id = AV_CODEC_ID_PCM_U8; |
astream->codec->channels = 1; |
astream->codec->channel_layout = AV_CH_LAYOUT_MONO; |
astream->codec->bits_per_coded_sample = 8; |
astream->codec->bit_rate = |
astream->codec->sample_rate * astream->codec->bits_per_coded_sample; |
avio_seek(pb, chunk_header - 3, SEEK_SET); |
avpriv_set_pts_info(astream, 64, 1, astream->codec->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 || url_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 (url_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); |
audio_size = video_offset - audio_offset; |
bfi->video_size = chunk_size - video_offset; |
if (audio_size < 0 || bfi->video_size < 0) { |
av_log(s, AV_LOG_ERROR, "Invalid audio/video offsets or chunk size\n"); |
return AVERROR_INVALIDDATA; |
} |
|
//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; |
} |
|
AVInputFormat ff_bfi_demuxer = { |
.name = "bfi", |
.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, |
}; |