From 5a717094676a9c3a5bc67686cb369911922cdd82 Mon Sep 17 00:00:00 2001 From: Peter Ross Date: Sun, 18 Jul 2010 08:06:55 +0000 Subject: [PATCH] Tele-typewriter demuxer Originally committed as revision 24301 to svn://svn.ffmpeg.org/ffmpeg/trunk --- Changelog | 1 + doc/general.texi | 2 + libavformat/Makefile | 1 + libavformat/allformats.c | 1 + libavformat/avformat.h | 2 +- libavformat/tty.c | 131 +++++++++++++++++++++++++++++++++++++++ 6 files changed, 137 insertions(+), 1 deletion(-) create mode 100644 libavformat/tty.c diff --git a/Changelog b/Changelog index 6a04869ccd..163b0f8477 100644 --- a/Changelog +++ b/Changelog @@ -21,6 +21,7 @@ version : - ffplay -exitonkeydown and -exitonmousedown options added - native GSM / GSM MS decoder - RTP depacketization of QDM2 +- ANSI/ASCII art playback system diff --git a/doc/general.texi b/doc/general.texi index 3a1fb7c0f4..e96f88d799 100644 --- a/doc/general.texi +++ b/doc/general.texi @@ -228,6 +228,7 @@ library: @item Sony Wave64 (W64) @tab @tab X @item SoX native format @tab X @tab X @item SUN AU format @tab X @tab X +@item Text files @tab @tab X @item THP @tab @tab X @tab Used on the Nintendo GameCube. @item Tiertex Limited SEQ @tab @tab X @@ -316,6 +317,7 @@ following image formats are supported: @tab Used in games like Mad Dog McCree. @item AMV Video @tab @tab X @tab Used in Chinese MP3 players. +@item ANSI/ASCII art @tab @tab X @item Apple MJPEG-B @tab @tab X @item Apple QuickDraw @tab @tab X @tab fourcc: qdrw diff --git a/libavformat/Makefile b/libavformat/Makefile index cab222c732..f8865ac9d9 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -249,6 +249,7 @@ OBJS-$(CONFIG_TMV_DEMUXER) += tmv.o OBJS-$(CONFIG_TRUEHD_DEMUXER) += raw.o OBJS-$(CONFIG_TRUEHD_MUXER) += raw.o OBJS-$(CONFIG_TTA_DEMUXER) += tta.o id3v1.o id3v2.o +OBJS-$(CONFIG_TTY_DEMUXER) += tty.o sauce.o OBJS-$(CONFIG_TXD_DEMUXER) += txd.o OBJS-$(CONFIG_VC1_DEMUXER) += raw.o OBJS-$(CONFIG_VC1T_DEMUXER) += vc1test.o diff --git a/libavformat/allformats.c b/libavformat/allformats.c index 94ab78c4e7..502c36c244 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -198,6 +198,7 @@ void av_register_all(void) REGISTER_MUXDEMUX (TRUEHD, truehd); REGISTER_DEMUXER (TTA, tta); REGISTER_DEMUXER (TXD, txd); + REGISTER_DEMUXER (TTY, tty); REGISTER_DEMUXER (VC1, vc1); REGISTER_MUXDEMUX (VC1T, vc1t); REGISTER_DEMUXER (VMD, vmd); diff --git a/libavformat/avformat.h b/libavformat/avformat.h index 4ab5cb59b1..bdd7f477e1 100644 --- a/libavformat/avformat.h +++ b/libavformat/avformat.h @@ -22,7 +22,7 @@ #define AVFORMAT_AVFORMAT_H #define LIBAVFORMAT_VERSION_MAJOR 52 -#define LIBAVFORMAT_VERSION_MINOR 74 +#define LIBAVFORMAT_VERSION_MINOR 75 #define LIBAVFORMAT_VERSION_MICRO 0 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \ diff --git a/libavformat/tty.c b/libavformat/tty.c new file mode 100644 index 0000000000..03a4f16d76 --- /dev/null +++ b/libavformat/tty.c @@ -0,0 +1,131 @@ +/* + * @file + * Tele-typewriter demuxer + * Copyright (c) 2010 Peter Ross + * + * 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 + */ + +#include "libavutil/intreadwrite.h" +#include "libavutil/avstring.h" +#include "avformat.h" +#include "sauce.h" +#include + +#define LINE_RATE 6000 /* characters per second */ + +typedef struct { + int chars_per_frame; + uint64_t fsize; /** file size less metadata buffer */ +} TtyDemuxContext; + +/** + * Parse EFI header + */ +static int efi_read(AVFormatContext *avctx, uint64_t start_pos) +{ + TtyDemuxContext *s = avctx->priv_data; + ByteIOContext *pb = avctx->pb; + char buf[37]; + int len; + + url_fseek(pb, start_pos, SEEK_SET); + if (get_byte(pb) != 0x1A) + return -1; + +#define GET_EFI_META(name,size) \ + len = get_byte(pb); \ + if (len < 1 || len > size) \ + return -1; \ + if (get_buffer(pb, buf, size) == size) { \ + buf[len] = 0; \ + av_metadata_set2(&avctx->metadata, name, buf, 0); \ + } + + GET_EFI_META("filename", 12) + GET_EFI_META("title", 36) + + s->fsize = start_pos; + return 0; +} + +static int read_header(AVFormatContext *avctx, + AVFormatParameters *ap) +{ + TtyDemuxContext *s = avctx->priv_data; + AVStream *st = av_new_stream(avctx, 0); + if (!st) + return AVERROR(ENOMEM); + st->codec->codec_tag = 0; + st->codec->codec_type = CODEC_TYPE_VIDEO; + st->codec->codec_id = CODEC_ID_ANSI; + if (ap->width) st->codec->width = ap->width; + if (ap->height) st->codec->height = ap->height; + + 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 */ + s->chars_per_frame = FFMAX(av_q2d(st->time_base) * (ap->sample_rate ? ap->sample_rate : LINE_RATE), 1); + + if (!url_is_streamed(avctx->pb)) { + s->fsize = url_fsize(avctx->pb); + st->duration = (s->fsize + s->chars_per_frame - 1) / s->chars_per_frame; + + if (ff_sauce_read(avctx, &s->fsize, 0, 0) < 0) + efi_read(avctx, s->fsize - 51); + + url_fseek(avctx->pb, 0, SEEK_SET); + } + + return 0; +} + +static int read_packet(AVFormatContext *avctx, AVPacket *pkt) +{ + TtyDemuxContext *s = avctx->priv_data; + int n; + + if (url_feof(avctx->pb)) + return AVERROR_EOF; + + n = s->chars_per_frame; + if (s->fsize) { + // ignore metadata buffer + uint64_t p = url_ftell(avctx->pb); + if (p + s->chars_per_frame > s->fsize) + n = s->fsize - p; + } + + pkt->size = av_get_packet(avctx->pb, pkt, n); + if (pkt->size <= 0) + return AVERROR(EIO); + pkt->flags |= PKT_FLAG_KEY; + return 0; +} + +AVInputFormat tty_demuxer = { + .name = "tty", + .long_name = NULL_IF_CONFIG_SMALL("Tele-typewriter"), + .priv_data_size = sizeof(TtyDemuxContext), + .read_header = read_header, + .read_packet = read_packet, + .extensions = "ans,art,asc,diz,ice,nfo,txt,vt", +};