ffmpeg/libavformat/bintext.c

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/*
* Binary text demuxer
* eXtended BINary text (XBIN) demuxer
* Artworx Data Format demuxer
* iCEDraw File demuxer
* Copyright (c) 2010 Peter Ross <pross@xvid.org>
*
* 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
* Binary text demuxer
* eXtended BINary text (XBIN) demuxer
* Artworx Data Format demuxer
* iCEDraw File demuxer
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "sauce.h"
#include "libavcodec/bintext.h"
#define LINE_RATE 6000 /** characters per second */
typedef struct {
int chars_per_frame;
uint64_t fsize; /**< file size less metadata buffer */
} BinDemuxContext;
#if CONFIG_BINTEXT_DEMUXER | CONFIG_ADF_DEMUXER | CONFIG_IDF_DEMUXER
/**
* Given filesize and width, calculate height (assume font_height of 16)
*/
static void calculate_height(AVCodecContext *avctx, uint64_t fsize)
{
avctx->height = (fsize / ((avctx->width>>3)*2)) << 4;
}
#endif
#if CONFIG_BINTEXT_DEMUXER
static const uint8_t next_magic[]={
0x1A, 0x1B, '[', '0', ';', '3', '0', ';', '4', '0', 'm', 'N', 'E', 'X', 'T', 0x00
};
static int next_tag_read(AVFormatContext *avctx, uint64_t *fsize)
{
AVIOContext *pb = avctx->pb;
char buf[36];
int len;
uint64_t start_pos = url_fsize(pb) - 256;
avio_seek(pb, start_pos, SEEK_SET);
if (avio_read(pb, buf, sizeof(next_magic)) != sizeof(next_magic))
return -1;
if (memcmp(buf, next_magic, sizeof(next_magic)))
return -1;
if (get_byte(pb) != 0x01)
return -1;
*fsize -= 256;
#define GET_EFI2_META(name,size) \
len = get_byte(pb); \
if (len < 1 || len > size) \
return -1; \
if (avio_read(pb, buf, size) == size && *buf) { \
buf[len] = 0; \
av_metadata_set2(&avctx->metadata, name, buf, 0); \
}
GET_EFI2_META("filename", 12)
GET_EFI2_META("author", 20)
GET_EFI2_META("publisher", 20)
GET_EFI2_META("title", 35)
return 0;
}
static void predict_width(AVCodecContext *avctx, uint64_t fsize, int got_width)
{
/** attempt to guess width */
if (!got_width)
avctx->width = fsize > 4000 ? (160<<3) : (80<<3);
}
static AVStream * init_stream(AVFormatContext *s,
AVFormatParameters *ap)
{
BinDemuxContext *bin = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return NULL;
st->codec->codec_tag = 0;
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
if (!ap->time_base.num) {
av_set_pts_info(st, 60, 1, 25);
} else {
av_set_pts_info(st, 60, ap->time_base.num, ap->time_base.den);
}
/* simulate tty display speed */
bin->chars_per_frame = FFMAX(av_q2d(st->time_base) * (ap->sample_rate ? ap->sample_rate : LINE_RATE), 1);
st->codec->width = ap->width ? ap->width : (80<<3);
st->codec->height = ap->height ? ap->height : (25<<4);
return st;
}
static int bintext_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
BinDemuxContext *bin = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st = init_stream(s, ap);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_id = CODEC_ID_BINTEXT;
st->codec->extradata_size = 2;
st->codec->extradata = av_malloc(st->codec->extradata_size);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
st->codec->extradata[0] = 16;
st->codec->extradata[1] = 0;
if (!url_is_streamed(pb)) {
int got_width = 0;
bin->fsize = url_fsize(pb);
if (ff_sauce_read(s, &bin->fsize, &got_width, 0) < 0)
next_tag_read(s, &bin->fsize);
if (!ap->width)
predict_width(st->codec, bin->fsize, got_width);
if (!ap->height)
calculate_height(st->codec, bin->fsize);
avio_seek(pb, 0, SEEK_SET);
}
return 0;
};
#endif /* CONFIG_BINTEXT_DEMUXER */
#if CONFIG_XBIN_DEMUXER
static int xbin_probe(AVProbeData *p)
{
const uint8_t *d = p->buf;
if (AV_RL32(d) == MKTAG('X','B','I','N') && d[4] == 0x1A &&
AV_RL16(d+5) > 0 && AV_RL16(d+5) <= 160 &&
d[9] > 0 && d[9] <= 32)
return AVPROBE_SCORE_MAX;
return 0;
}
static int xbin_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
BinDemuxContext *bin = s->priv_data;
AVIOContext *pb = s->pb;
char fontheight, flags;
AVStream *st = init_stream(s, ap);
if (!st)
return AVERROR(ENOMEM);
url_fskip(pb, 5);
st->codec->width = get_le16(pb)<<3;
st->codec->height = get_le16(pb);
fontheight = get_byte(pb);
st->codec->height *= fontheight;
flags = get_byte(pb);
st->codec->extradata_size = 2;
if ((flags & BINTEXT_PALETTE))
st->codec->extradata_size += 48;
if ((flags & BINTEXT_FONT))
st->codec->extradata_size += fontheight * (flags & 0x10 ? 512 : 256);
st->codec->codec_id = flags & 4 ? CODEC_ID_XBIN : CODEC_ID_BINTEXT;
st->codec->extradata = av_malloc(st->codec->extradata_size);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
st->codec->extradata[0] = fontheight;
st->codec->extradata[1] = flags;
if (avio_read(pb, st->codec->extradata + 2, st->codec->extradata_size - 2) < 0)
return AVERROR(EIO);
if (!url_is_streamed(pb)) {
bin->fsize = url_fsize(pb) - 9 - st->codec->extradata_size;
ff_sauce_read(s, &bin->fsize, NULL, 0);
avio_seek(pb, 9 + st->codec->extradata_size, SEEK_SET);
}
return 0;
}
#endif /* CONFIG_XBIN_DEMUXER */
#if CONFIG_ADF_DEMUXER
static int adf_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
BinDemuxContext *bin = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st;
if (get_byte(pb) != 1)
return AVERROR_INVALIDDATA;
st = init_stream(s, ap);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_id = CODEC_ID_BINTEXT;
st->codec->extradata_size = 2 + 48 + 4096;
st->codec->extradata = av_malloc(st->codec->extradata_size);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
st->codec->extradata[0] = 16;
st->codec->extradata[1] = BINTEXT_PALETTE|BINTEXT_FONT;
if (avio_read(pb, st->codec->extradata + 2, 24) < 0)
return AVERROR(EIO);
url_fskip(pb, 144);
if (avio_read(pb, st->codec->extradata + 2 + 24, 24) < 0)
return AVERROR(EIO);
if (avio_read(pb, st->codec->extradata + 2 + 48, 4096) < 0)
return AVERROR(EIO);
if (!url_is_streamed(pb)) {
int got_width = 0;
bin->fsize = url_fsize(pb) - 1 - 192 - 4096;
st->codec->width = 80<<3;
ff_sauce_read(s, &bin->fsize, &got_width, 0);
if (!ap->height)
calculate_height(st->codec, bin->fsize);
avio_seek(pb, 1 + 192 + 4096, SEEK_SET);
}
return 0;
}
#endif /* CONFIG_ADF_DEMUXER */
#if CONFIG_IDF_DEMUXER
static const uint8_t idf_magic[] = {
0x04, 0x31, 0x2e, 0x34, 0x00, 0x00, 0x00, 0x00, 0x4f, 0x00, 0x15, 0x00
};
static int idf_probe(AVProbeData *p)
{
if (p->buf_size < sizeof(idf_magic))
return 0;
if (!memcmp(p->buf, idf_magic, sizeof(idf_magic)))
return AVPROBE_SCORE_MAX;
return 0;
}
static int idf_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
BinDemuxContext *bin = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st;
int got_width = 0;
if (url_is_streamed(pb))
return AVERROR(EIO);
st = init_stream(s, ap);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_id = CODEC_ID_IDF;
st->codec->extradata_size = 2 + 48 + 4096;
st->codec->extradata = av_malloc(st->codec->extradata_size);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
st->codec->extradata[0] = 16;
st->codec->extradata[1] = BINTEXT_PALETTE|BINTEXT_FONT;
avio_seek(pb, avio_size(pb) - 4096 - 48, SEEK_SET);
if (avio_read(pb, st->codec->extradata + 2 + 48, 4096) < 0)
return AVERROR(EIO);
if (avio_read(pb, st->codec->extradata + 2, 48) < 0)
return AVERROR(EIO);
bin->fsize = url_fsize(pb) - 12 - 4096 - 48;
ff_sauce_read(s, &bin->fsize, &got_width, 0);
if (!ap->height)
calculate_height(st->codec, bin->fsize);
avio_seek(pb, 12, SEEK_SET);
return 0;
}
#endif /* CONFIG_IDF_DEMUXER */
static int read_packet(AVFormatContext *s,
AVPacket *pkt)
{
BinDemuxContext *bin = s->priv_data;
if (bin->fsize > 0) {
if (av_get_packet(s->pb, pkt, bin->fsize) < 0)
return AVERROR(EIO);
bin->fsize = -1; /* done */
} else if (!bin->fsize) {
if (url_feof(s->pb))
return AVERROR(EIO);
if (av_get_packet(s->pb, pkt, bin->chars_per_frame) < 0)
return AVERROR(EIO);
} else {
return AVERROR(EIO);
}
pkt->flags |= AV_PKT_FLAG_KEY;
return 0;
}
#if CONFIG_BINTEXT_DEMUXER
AVInputFormat ff_bintext_demuxer = {
.name = "bin",
.long_name = NULL_IF_CONFIG_SMALL("Binary text"),
.priv_data_size = sizeof(BinDemuxContext),
.read_header = bintext_read_header,
.read_packet = read_packet,
.extensions = "bin",
};
#endif
#if CONFIG_XBIN_DEMUXER
AVInputFormat ff_xbin_demuxer = {
.name = "xbin",
.long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text (XBIN)"),
.priv_data_size = sizeof(BinDemuxContext),
.read_probe = xbin_probe,
.read_header = xbin_read_header,
.read_packet = read_packet,
};
#endif
#if CONFIG_ADF_DEMUXER
AVInputFormat ff_adf_demuxer = {
.name = "adf",
.long_name = NULL_IF_CONFIG_SMALL("Artworx Data Format"),
.priv_data_size = sizeof(BinDemuxContext),
.read_header = adf_read_header,
.read_packet = read_packet,
.extensions = "adf",
};
#endif
#if CONFIG_IDF_DEMUXER
AVInputFormat ff_idf_demuxer = {
.name = "idf",
.long_name = NULL_IF_CONFIG_SMALL("iCE Draw File"),
.priv_data_size = sizeof(BinDemuxContext),
.read_probe = idf_probe,
.read_header = idf_read_header,
.read_packet = read_packet,
.extensions = "idf",
};
#endif