mirror of
https://git.ffmpeg.org/ffmpeg.git
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396 lines
12 KiB
C
396 lines
12 KiB
C
/*
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* Binary text demuxer
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* eXtended BINary text (XBIN) demuxer
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* Artworx Data Format demuxer
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* iCEDraw File demuxer
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* Copyright (c) 2010 Peter Ross <pross@xvid.org>
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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
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* Binary text demuxer
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* eXtended BINary text (XBIN) demuxer
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* Artworx Data Format demuxer
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* iCEDraw File demuxer
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*/
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#include "libavutil/intreadwrite.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "avformat.h"
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#include "internal.h"
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#include "sauce.h"
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#include "libavcodec/bintext.h"
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typedef struct {
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const AVClass *class;
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int chars_per_frame; /**< characters to send decoder per frame;
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set by private options as characters per second, and then
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converted to characters per frame at runtime */
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int width, height; /**< video size (WxH pixels) (private option) */
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AVRational framerate; /**< frames per second (private option) */
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uint64_t fsize; /**< file size less metadata buffer */
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} BinDemuxContext;
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static AVStream * init_stream(AVFormatContext *s)
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{
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BinDemuxContext *bin = s->priv_data;
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return NULL;
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st->codec->codec_tag = 0;
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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if (!bin->width) {
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st->codec->width = (80<<3);
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st->codec->height = (25<<4);
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}
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avpriv_set_pts_info(st, 60, bin->framerate.den, bin->framerate.num);
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/* simulate tty display speed */
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bin->chars_per_frame = FFMAX(av_q2d(st->time_base) * bin->chars_per_frame, 1);
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return st;
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}
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#if CONFIG_BINTEXT_DEMUXER | CONFIG_ADF_DEMUXER | CONFIG_IDF_DEMUXER
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/**
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* Given filesize and width, calculate height (assume font_height of 16)
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*/
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static void calculate_height(AVCodecContext *avctx, uint64_t fsize)
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{
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avctx->height = (fsize / ((avctx->width>>3)*2)) << 4;
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}
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#endif
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#if CONFIG_BINTEXT_DEMUXER
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static const uint8_t next_magic[]={
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0x1A, 0x1B, '[', '0', ';', '3', '0', ';', '4', '0', 'm', 'N', 'E', 'X', 'T', 0x00
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};
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static int next_tag_read(AVFormatContext *avctx, uint64_t *fsize)
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{
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AVIOContext *pb = avctx->pb;
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char buf[36];
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int len;
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uint64_t start_pos = avio_size(pb) - 256;
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avio_seek(pb, start_pos, SEEK_SET);
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if (avio_read(pb, buf, sizeof(next_magic)) != sizeof(next_magic))
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return -1;
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if (memcmp(buf, next_magic, sizeof(next_magic)))
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return -1;
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if (avio_r8(pb) != 0x01)
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return -1;
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*fsize -= 256;
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#define GET_EFI2_META(name,size) \
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len = avio_r8(pb); \
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if (len < 1 || len > size) \
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return -1; \
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if (avio_read(pb, buf, size) == size && *buf) { \
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buf[len] = 0; \
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av_dict_set(&avctx->metadata, name, buf, 0); \
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}
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GET_EFI2_META("filename", 12)
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GET_EFI2_META("author", 20)
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GET_EFI2_META("publisher", 20)
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GET_EFI2_META("title", 35)
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return 0;
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}
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static void predict_width(AVCodecContext *avctx, uint64_t fsize, int got_width)
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{
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/** attempt to guess width */
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if (!got_width)
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avctx->width = fsize > 4000 ? (160<<3) : (80<<3);
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}
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static int bintext_read_header(AVFormatContext *s)
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{
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BinDemuxContext *bin = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st = init_stream(s);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_id = AV_CODEC_ID_BINTEXT;
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st->codec->extradata_size = 2;
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st->codec->extradata = av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!st->codec->extradata)
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return AVERROR(ENOMEM);
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st->codec->extradata[0] = 16;
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st->codec->extradata[1] = 0;
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if (pb->seekable) {
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int got_width = 0;
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bin->fsize = avio_size(pb);
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if (ff_sauce_read(s, &bin->fsize, &got_width, 0) < 0)
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next_tag_read(s, &bin->fsize);
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if (!bin->width) {
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predict_width(st->codec, bin->fsize, got_width);
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calculate_height(st->codec, bin->fsize);
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}
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avio_seek(pb, 0, SEEK_SET);
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}
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return 0;
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}
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#endif /* CONFIG_BINTEXT_DEMUXER */
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#if CONFIG_XBIN_DEMUXER
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static int xbin_probe(AVProbeData *p)
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{
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const uint8_t *d = p->buf;
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if (AV_RL32(d) == MKTAG('X','B','I','N') && d[4] == 0x1A &&
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AV_RL16(d+5) > 0 && AV_RL16(d+5) <= 160 &&
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d[9] > 0 && d[9] <= 32)
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int xbin_read_header(AVFormatContext *s)
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{
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BinDemuxContext *bin = s->priv_data;
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AVIOContext *pb = s->pb;
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char fontheight, flags;
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AVStream *st = init_stream(s);
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if (!st)
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return AVERROR(ENOMEM);
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avio_skip(pb, 5);
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st->codec->width = avio_rl16(pb)<<3;
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st->codec->height = avio_rl16(pb);
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fontheight = avio_r8(pb);
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st->codec->height *= fontheight;
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flags = avio_r8(pb);
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st->codec->extradata_size = 2;
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if ((flags & BINTEXT_PALETTE))
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st->codec->extradata_size += 48;
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if ((flags & BINTEXT_FONT))
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st->codec->extradata_size += fontheight * (flags & 0x10 ? 512 : 256);
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st->codec->codec_id = flags & 4 ? AV_CODEC_ID_XBIN : AV_CODEC_ID_BINTEXT;
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st->codec->extradata = av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!st->codec->extradata)
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return AVERROR(ENOMEM);
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st->codec->extradata[0] = fontheight;
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st->codec->extradata[1] = flags;
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if (avio_read(pb, st->codec->extradata + 2, st->codec->extradata_size - 2) < 0)
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return AVERROR(EIO);
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if (pb->seekable) {
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bin->fsize = avio_size(pb) - 9 - st->codec->extradata_size;
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ff_sauce_read(s, &bin->fsize, NULL, 0);
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avio_seek(pb, 9 + st->codec->extradata_size, SEEK_SET);
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}
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return 0;
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}
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#endif /* CONFIG_XBIN_DEMUXER */
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#if CONFIG_ADF_DEMUXER
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static int adf_read_header(AVFormatContext *s)
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{
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BinDemuxContext *bin = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st;
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if (avio_r8(pb) != 1)
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return AVERROR_INVALIDDATA;
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st = init_stream(s);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_id = AV_CODEC_ID_BINTEXT;
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st->codec->extradata_size = 2 + 48 + 4096;
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st->codec->extradata = av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!st->codec->extradata)
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return AVERROR(ENOMEM);
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st->codec->extradata[0] = 16;
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st->codec->extradata[1] = BINTEXT_PALETTE|BINTEXT_FONT;
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if (avio_read(pb, st->codec->extradata + 2, 24) < 0)
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return AVERROR(EIO);
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avio_skip(pb, 144);
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if (avio_read(pb, st->codec->extradata + 2 + 24, 24) < 0)
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return AVERROR(EIO);
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if (avio_read(pb, st->codec->extradata + 2 + 48, 4096) < 0)
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return AVERROR(EIO);
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if (pb->seekable) {
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int got_width = 0;
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bin->fsize = avio_size(pb) - 1 - 192 - 4096;
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st->codec->width = 80<<3;
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ff_sauce_read(s, &bin->fsize, &got_width, 0);
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if (!bin->width)
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calculate_height(st->codec, bin->fsize);
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avio_seek(pb, 1 + 192 + 4096, SEEK_SET);
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}
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return 0;
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}
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#endif /* CONFIG_ADF_DEMUXER */
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#if CONFIG_IDF_DEMUXER
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static const uint8_t idf_magic[] = {
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0x04, 0x31, 0x2e, 0x34, 0x00, 0x00, 0x00, 0x00, 0x4f, 0x00, 0x15, 0x00
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};
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static int idf_probe(AVProbeData *p)
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{
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if (p->buf_size < sizeof(idf_magic))
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return 0;
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if (!memcmp(p->buf, idf_magic, sizeof(idf_magic)))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int idf_read_header(AVFormatContext *s)
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{
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BinDemuxContext *bin = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st;
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int got_width = 0;
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if (!pb->seekable)
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return AVERROR(EIO);
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st = init_stream(s);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_id = AV_CODEC_ID_IDF;
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st->codec->extradata_size = 2 + 48 + 4096;
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st->codec->extradata = av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!st->codec->extradata)
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return AVERROR(ENOMEM);
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st->codec->extradata[0] = 16;
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st->codec->extradata[1] = BINTEXT_PALETTE|BINTEXT_FONT;
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avio_seek(pb, avio_size(pb) - 4096 - 48, SEEK_SET);
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if (avio_read(pb, st->codec->extradata + 2 + 48, 4096) < 0)
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return AVERROR(EIO);
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if (avio_read(pb, st->codec->extradata + 2, 48) < 0)
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return AVERROR(EIO);
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bin->fsize = avio_size(pb) - 12 - 4096 - 48;
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ff_sauce_read(s, &bin->fsize, &got_width, 0);
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if (!bin->width)
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calculate_height(st->codec, bin->fsize);
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avio_seek(pb, 12, SEEK_SET);
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return 0;
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}
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#endif /* CONFIG_IDF_DEMUXER */
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static int read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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BinDemuxContext *bin = s->priv_data;
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if (bin->fsize > 0) {
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if (av_get_packet(s->pb, pkt, bin->fsize) < 0)
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return AVERROR(EIO);
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bin->fsize = -1; /* done */
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} else if (!bin->fsize) {
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if (url_feof(s->pb))
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return AVERROR(EIO);
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if (av_get_packet(s->pb, pkt, bin->chars_per_frame) < 0)
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return AVERROR(EIO);
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} else {
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return AVERROR(EIO);
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}
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pkt->flags |= AV_PKT_FLAG_KEY;
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return 0;
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}
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#define OFFSET(x) offsetof(BinDemuxContext, x)
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static const AVOption options[] = {
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{ "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},
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{ "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 },
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{ "framerate", "set framerate (frames per second)", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
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{ NULL },
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};
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#define CLASS(name) \
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(const AVClass[1]){{ \
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.class_name = name, \
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.item_name = av_default_item_name, \
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.option = options, \
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.version = LIBAVUTIL_VERSION_INT, \
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}}
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#if CONFIG_BINTEXT_DEMUXER
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AVInputFormat ff_bintext_demuxer = {
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.name = "bin",
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.long_name = NULL_IF_CONFIG_SMALL("Binary text"),
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.priv_data_size = sizeof(BinDemuxContext),
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.read_header = bintext_read_header,
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.read_packet = read_packet,
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.extensions = "bin",
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.priv_class = CLASS("Binary text demuxer"),
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};
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#endif
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#if CONFIG_XBIN_DEMUXER
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AVInputFormat ff_xbin_demuxer = {
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.name = "xbin",
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.long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text (XBIN)"),
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.priv_data_size = sizeof(BinDemuxContext),
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.read_probe = xbin_probe,
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.read_header = xbin_read_header,
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.read_packet = read_packet,
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.priv_class = CLASS("eXtended BINary text (XBIN) demuxer"),
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};
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#endif
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#if CONFIG_ADF_DEMUXER
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AVInputFormat ff_adf_demuxer = {
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.name = "adf",
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.long_name = NULL_IF_CONFIG_SMALL("Artworx Data Format"),
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.priv_data_size = sizeof(BinDemuxContext),
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.read_header = adf_read_header,
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.read_packet = read_packet,
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.extensions = "adf",
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.priv_class = CLASS("Artworx Data Format demuxer"),
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};
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#endif
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#if CONFIG_IDF_DEMUXER
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AVInputFormat ff_idf_demuxer = {
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.name = "idf",
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.long_name = NULL_IF_CONFIG_SMALL("iCE Draw File"),
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.priv_data_size = sizeof(BinDemuxContext),
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.read_probe = idf_probe,
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.read_header = idf_read_header,
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.read_packet = read_packet,
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.extensions = "idf",
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.priv_class = CLASS("iCE Draw File demuxer"),
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};
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#endif
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