libavformat/bintext.c - chromium/third_party/ffmpeg - Git at Google

 /*
  * 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 "libavutil/opt.h"
 #include "libavutil/parseutils.h"
 #include "avformat.h"
 #include "internal.h"
 #include "sauce.h"
 #include "libavcodec/bintext.h"

 typedef struct {
     const AVClass *class;
     int chars_per_frame; /**< characters to send decoder per frame;
                               set by private options as characters per second, and then
                               converted to characters per frame at runtime */
     int width, height;    /**< video size (WxH pixels) (private option) */
     AVRational framerate; /**< frames per second (private option) */
     uint64_t fsize;  /**< file size less metadata buffer */
 } BinDemuxContext;

 static AVStream * init_stream(AVFormatContext *s)
 {
     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 (!bin->width) {
         st->codec->width  = (80<<3);
         st->codec->height = (25<<4);
     }

     avpriv_set_pts_info(st, 60, bin->framerate.den, bin->framerate.num);

     /* simulate tty display speed */
     bin->chars_per_frame = av_clip(av_q2d(st->time_base) * bin->chars_per_frame, 1, INT_MAX);

     return st;
 }

 #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 = avio_size(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 (avio_r8(pb) != 0x01)
         return -1;

     *fsize -= 256;

 #define GET_EFI2_META(name,size) \
     len = avio_r8(pb); \
     if (len < 1 || len > size) \
         return -1; \
     if (avio_read(pb, buf, size) == size && *buf) { \
         buf[len] = 0; \
         av_dict_set(&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 int bintext_read_header(AVFormatContext *s)
 {
     BinDemuxContext *bin = s->priv_data;
     AVIOContext *pb = s->pb;

     AVStream *st = init_stream(s);
     if (!st)
         return AVERROR(ENOMEM);
     st->codec->codec_id    = AV_CODEC_ID_BINTEXT;

     if (ff_alloc_extradata(st->codec, 2))
         return AVERROR(ENOMEM);
     st->codec->extradata[0] = 16;
     st->codec->extradata[1] = 0;

     if (pb->seekable) {
         int got_width = 0;
         bin->fsize = avio_size(pb);
         if (ff_sauce_read(s, &bin->fsize, &got_width, 0) < 0)
             next_tag_read(s, &bin->fsize);
         if (!bin->width) {
             predict_width(st->codec, bin->fsize, got_width);
             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)
 {
     BinDemuxContext *bin = s->priv_data;
     AVIOContext *pb = s->pb;
     char fontheight, flags;

     AVStream *st = init_stream(s);
     if (!st)
         return AVERROR(ENOMEM);

     avio_skip(pb, 5);
     st->codec->width   = avio_rl16(pb)<<3;
     st->codec->height  = avio_rl16(pb);
     fontheight         = avio_r8(pb);
     st->codec->height *= fontheight;
     flags              = avio_r8(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 ? AV_CODEC_ID_XBIN : AV_CODEC_ID_BINTEXT;

     if (ff_alloc_extradata(st->codec, st->codec->extradata_size))
         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 (pb->seekable) {
         bin->fsize = avio_size(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)
 {
     BinDemuxContext *bin = s->priv_data;
     AVIOContext *pb = s->pb;
     AVStream *st;

     if (avio_r8(pb) != 1)
         return AVERROR_INVALIDDATA;

     st = init_stream(s);
     if (!st)
         return AVERROR(ENOMEM);
     st->codec->codec_id    = AV_CODEC_ID_BINTEXT;

     if (ff_alloc_extradata(st->codec, 2 + 48 + 4096))
         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);
     avio_skip(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 (pb->seekable) {
         int got_width = 0;
         bin->fsize = avio_size(pb) - 1 - 192 - 4096;
         st->codec->width = 80<<3;
         ff_sauce_read(s, &bin->fsize, &got_width, 0);
         if (!bin->width)
             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)
 {
     BinDemuxContext *bin = s->priv_data;
     AVIOContext *pb = s->pb;
     AVStream *st;
     int got_width = 0;

     if (!pb->seekable)
         return AVERROR(EIO);

     st = init_stream(s);
     if (!st)
         return AVERROR(ENOMEM);
     st->codec->codec_id    = AV_CODEC_ID_IDF;

     if (ff_alloc_extradata(st->codec, 2 + 48 + 4096))
         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 = avio_size(pb) - 12 - 4096 - 48;
     ff_sauce_read(s, &bin->fsize, &got_width, 0);
     if (!bin->width)
         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 (avio_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;
 }

 #define OFFSET(x) offsetof(BinDemuxContext, x)
 static const AVOption options[] = {
     { "linespeed", "set simulated line speed (bytes per second)", OFFSET(chars_per_frame), AV_OPT_TYPE_INT, {.i64 = 6000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM},
     { "video_size", "set video size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
     { "framerate", "set framerate (frames per second)", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
     { NULL },
 };

 #define CLASS(name) \
 (const AVClass[1]){{ \
     .class_name     = name, \
     .item_name      = av_default_item_name, \
     .option         = options, \
     .version        = LIBAVUTIL_VERSION_INT, \
 }}

 #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",
     .priv_class     = CLASS("Binary text demuxer"),
 };
 #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,
     .priv_class     = CLASS("eXtended BINary text (XBIN) demuxer"),
 };
 #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",
     .priv_class     = CLASS("Artworx Data Format demuxer"),
 };
 #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",
     .priv_class     = CLASS("iCE Draw File demuxer"),
 };
 #endif
	/*
	* 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 "libavutil/opt.h"
	#include "libavutil/parseutils.h"
	#include "avformat.h"
	#include "internal.h"
	#include "sauce.h"
	#include "libavcodec/bintext.h"

	typedef struct {
	const AVClass *class;
	int chars_per_frame; /**< characters to send decoder per frame;
	set by private options as characters per second, and then
	converted to characters per frame at runtime */
	int width, height; /*< video size (WxH pixels) (private option) /
	AVRational framerate; /*< frames per second (private option) /
	uint64_t fsize; /*< file size less metadata buffer /
	} BinDemuxContext;

	static AVStream * init_stream(AVFormatContext *s)
	{
	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 (!bin->width) {
	st->codec->width = (80<<3);
	st->codec->height = (25<<4);
	}

	avpriv_set_pts_info(st, 60, bin->framerate.den, bin->framerate.num);

	/* simulate tty display speed */
	bin->chars_per_frame = av_clip(av_q2d(st->time_base) * bin->chars_per_frame, 1, INT_MAX);

	return st;
	}

	#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 = avio_size(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 (avio_r8(pb) != 0x01)
	return -1;

	*fsize -= 256;

	#define GET_EFI2_META(name,size) \
	len = avio_r8(pb); \
	if (len < 1 \|\| len > size) \
	return -1; \
	if (avio_read(pb, buf, size) == size && *buf) { \
	buf[len] = 0; \
	av_dict_set(&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 int bintext_read_header(AVFormatContext *s)
	{
	BinDemuxContext *bin = s->priv_data;
	AVIOContext *pb = s->pb;

	AVStream *st = init_stream(s);
	if (!st)
	return AVERROR(ENOMEM);
	st->codec->codec_id = AV_CODEC_ID_BINTEXT;

	if (ff_alloc_extradata(st->codec, 2))
	return AVERROR(ENOMEM);
	st->codec->extradata[0] = 16;
	st->codec->extradata[1] = 0;

	if (pb->seekable) {
	int got_width = 0;
	bin->fsize = avio_size(pb);
	if (ff_sauce_read(s, &bin->fsize, &got_width, 0) < 0)
	next_tag_read(s, &bin->fsize);
	if (!bin->width) {
	predict_width(st->codec, bin->fsize, got_width);
	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)
	{
	BinDemuxContext *bin = s->priv_data;
	AVIOContext *pb = s->pb;
	char fontheight, flags;

	AVStream *st = init_stream(s);
	if (!st)
	return AVERROR(ENOMEM);

	avio_skip(pb, 5);
	st->codec->width = avio_rl16(pb)<<3;
	st->codec->height = avio_rl16(pb);
	fontheight = avio_r8(pb);
	st->codec->height *= fontheight;
	flags = avio_r8(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 ? AV_CODEC_ID_XBIN : AV_CODEC_ID_BINTEXT;

	if (ff_alloc_extradata(st->codec, st->codec->extradata_size))
	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 (pb->seekable) {
	bin->fsize = avio_size(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)
	{
	BinDemuxContext *bin = s->priv_data;
	AVIOContext *pb = s->pb;
	AVStream *st;

	if (avio_r8(pb) != 1)
	return AVERROR_INVALIDDATA;

	st = init_stream(s);
	if (!st)
	return AVERROR(ENOMEM);
	st->codec->codec_id = AV_CODEC_ID_BINTEXT;

	if (ff_alloc_extradata(st->codec, 2 + 48 + 4096))
	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);
	avio_skip(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 (pb->seekable) {
	int got_width = 0;
	bin->fsize = avio_size(pb) - 1 - 192 - 4096;
	st->codec->width = 80<<3;
	ff_sauce_read(s, &bin->fsize, &got_width, 0);
	if (!bin->width)
	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)
	{
	BinDemuxContext *bin = s->priv_data;
	AVIOContext *pb = s->pb;
	AVStream *st;
	int got_width = 0;

	if (!pb->seekable)
	return AVERROR(EIO);

	st = init_stream(s);
	if (!st)
	return AVERROR(ENOMEM);
	st->codec->codec_id = AV_CODEC_ID_IDF;

	if (ff_alloc_extradata(st->codec, 2 + 48 + 4096))
	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 = avio_size(pb) - 12 - 4096 - 48;
	ff_sauce_read(s, &bin->fsize, &got_width, 0);
	if (!bin->width)
	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 (avio_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;
	}

	#define OFFSET(x) offsetof(BinDemuxContext, x)
	static const AVOption options[] = {
	{ "linespeed", "set simulated line speed (bytes per second)", OFFSET(chars_per_frame), AV_OPT_TYPE_INT, {.i64 = 6000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM},
	{ "video_size", "set video size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
	{ "framerate", "set framerate (frames per second)", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
	{ NULL },
	};

	#define CLASS(name) \
	(const AVClass[1]){{ \
	.class_name = name, \
	.item_name = av_default_item_name, \
	.option = options, \
	.version = LIBAVUTIL_VERSION_INT, \
	}}

	#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",
	.priv_class = CLASS("Binary text demuxer"),
	};
	#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,
	.priv_class = CLASS("eXtended BINary text (XBIN) demuxer"),
	};
	#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",
	.priv_class = CLASS("Artworx Data Format demuxer"),
	};
	#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",
	.priv_class = CLASS("iCE Draw File demuxer"),
	};
	#endif