diff options
Diffstat (limited to 'libavformat/bintext.c')
| -rw-r--r-- | libavformat/bintext.c | 375 |
1 files changed, 375 insertions, 0 deletions
diff --git a/libavformat/bintext.c b/libavformat/bintext.c new file mode 100644 index 0000000..e03a31e --- /dev/null +++ b/libavformat/bintext.c @@ -0,0 +1,375 @@ +/* + * 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) +{ + ByteIOContext *pb = avctx->pb; + char buf[36]; + int len; + uint64_t start_pos = url_fsize(pb) - 256; + + url_fseek(pb, start_pos, SEEK_SET); + if (get_buffer(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 (get_buffer(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 = av_new_stream(s, 0); + 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; + ByteIOContext *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); + url_fseek(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; + ByteIOContext *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 (get_buffer(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); + url_fseek(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; + ByteIOContext *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 (get_buffer(pb, st->codec->extradata + 2, 24) < 0) + return AVERROR(EIO); + url_fskip(pb, 144); + if (get_buffer(pb, st->codec->extradata + 2 + 24, 24) < 0) + return AVERROR(EIO); + if (get_buffer(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); + url_fseek(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; + ByteIOContext *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; + + url_fseek(pb, url_fsize(pb) - 4096 - 48, SEEK_SET); + + if (get_buffer(pb, st->codec->extradata + 2 + 48, 4096) < 0) + return AVERROR(EIO); + if (get_buffer(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); + url_fseek(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 |
