/* * FLI/FLC Animation File Demuxer * Copyright (c) 2003 The ffmpeg Project * * This library 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 of the License, or (at your option) any later version. * * This library 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 this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /** * @file flic.c * FLI/FLC file demuxer * by Mike Melanson (melanson@pcisys.net) * for more information on the .fli/.flc file format and all of its many * variations, visit: * http://www.compuphase.com/flic.htm * * This demuxer handles standard 0xAF11- and 0xAF12-type FLIs. It also * handles special FLIs from the PC game "Magic Carpet". */ #include "avformat.h" #define FLIC_FILE_MAGIC_1 0xAF11 #define FLIC_FILE_MAGIC_2 0xAF12 #define FLIC_CHUNK_MAGIC_1 0xF1FA #define FLIC_CHUNK_MAGIC_2 0xF5FA #define FLIC_MC_PTS_INC 6000 /* pts increment for Magic Carpet game FLIs */ #define FLIC_DEFAULT_PTS_INC 6000 /* for FLIs that have 0 speed */ #define FLIC_HEADER_SIZE 128 #define FLIC_PREAMBLE_SIZE 6 typedef struct FlicDemuxContext { int frame_pts_inc; int64_t pts; int video_stream_index; } FlicDemuxContext; static int flic_probe(AVProbeData *p) { int magic_number; if (p->buf_size < 6) return 0; magic_number = LE_16(&p->buf[4]); if ((magic_number != FLIC_FILE_MAGIC_1) && (magic_number != FLIC_FILE_MAGIC_2)) return 0; return AVPROBE_SCORE_MAX; } static int flic_read_header(AVFormatContext *s, AVFormatParameters *ap) { FlicDemuxContext *flic = (FlicDemuxContext *)s->priv_data; ByteIOContext *pb = &s->pb; unsigned char header[FLIC_HEADER_SIZE]; AVStream *st; int speed; int magic_number; flic->pts = 0; /* load the whole header and pull out the width and height */ if (get_buffer(pb, header, FLIC_HEADER_SIZE) != FLIC_HEADER_SIZE) return AVERROR_IO; magic_number = LE_16(&header[4]); speed = LE_32(&header[0x10]); /* initialize the decoder streams */ st = av_new_stream(s, 0); if (!st) return AVERROR_NOMEM; flic->video_stream_index = st->index; st->codec.codec_type = CODEC_TYPE_VIDEO; st->codec.codec_id = CODEC_ID_FLIC; st->codec.codec_tag = 0; /* no fourcc */ st->codec.width = LE_16(&header[0x08]); st->codec.height = LE_16(&header[0x0A]); if (!st->codec.width || !st->codec.height) return AVERROR_INVALIDDATA; /* send over the whole 128-byte FLIC header */ st->codec.extradata_size = FLIC_HEADER_SIZE; st->codec.extradata = av_malloc(FLIC_HEADER_SIZE); memcpy(st->codec.extradata, header, FLIC_HEADER_SIZE); av_set_pts_info(st, 33, 1, 90000); /* Time to figure out the framerate: If there is a FLIC chunk magic * number at offset 0x10, assume this is from the Bullfrog game, * Magic Carpet. */ if (LE_16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) { flic->frame_pts_inc = FLIC_MC_PTS_INC; /* rewind the stream since the first chunk is at offset 12 */ url_fseek(pb, 12, SEEK_SET); /* send over abbreviated FLIC header chunk */ av_free(st->codec.extradata); st->codec.extradata_size = 12; st->codec.extradata = av_malloc(12); memcpy(st->codec.extradata, header, 12); } else if (magic_number == FLIC_FILE_MAGIC_1) { /* * in this case, the speed (n) is number of 1/70s ticks between frames: * * pts n * frame # * -------- = ----------- => pts = n * (90000/70) * frame # * 90000 70 * * therefore, the frame pts increment = n * 1285.7 */ flic->frame_pts_inc = speed * 1285.7; } else if (magic_number == FLIC_FILE_MAGIC_2) { /* * in this case, the speed (n) is number of milliseconds between frames: * * pts n * frame # * -------- = ----------- => pts = n * 90 * frame # * 90000 1000 * * therefore, the frame pts increment = n * 90 */ flic->frame_pts_inc = speed * 90; } else return AVERROR_INVALIDDATA; if (flic->frame_pts_inc == 0) flic->frame_pts_inc = FLIC_DEFAULT_PTS_INC; return 0; } static int flic_read_packet(AVFormatContext *s, AVPacket *pkt) { FlicDemuxContext *flic = (FlicDemuxContext *)s->priv_data; ByteIOContext *pb = &s->pb; int packet_read = 0; unsigned int size; int magic; int ret = 0; unsigned char preamble[FLIC_PREAMBLE_SIZE]; while (!packet_read) { if ((ret = get_buffer(pb, preamble, FLIC_PREAMBLE_SIZE)) != FLIC_PREAMBLE_SIZE) { ret = AVERROR_IO; break; } size = LE_32(&preamble[0]); magic = LE_16(&preamble[4]); if ((magic == FLIC_CHUNK_MAGIC_1) || (magic == FLIC_CHUNK_MAGIC_2)) { if (av_new_packet(pkt, size)) { ret = AVERROR_IO; break; } pkt->stream_index = flic->video_stream_index; pkt->pts = flic->pts; memcpy(pkt->data, preamble, FLIC_PREAMBLE_SIZE); ret = get_buffer(pb, pkt->data + FLIC_PREAMBLE_SIZE, size - FLIC_PREAMBLE_SIZE); if (ret != size - FLIC_PREAMBLE_SIZE) { av_free_packet(pkt); ret = AVERROR_IO; } flic->pts += flic->frame_pts_inc; packet_read = 1; } else { /* not interested in this chunk */ url_fseek(pb, size - 6, SEEK_CUR); } } return ret; } static int flic_read_close(AVFormatContext *s) { // FlicDemuxContext *flic = (FlicDemuxContext *)s->priv_data; return 0; } static AVInputFormat flic_iformat = { "flic", "FLI/FLC animation format", sizeof(FlicDemuxContext), flic_probe, flic_read_header, flic_read_packet, flic_read_close, }; int flic_init(void) { av_register_input_format(&flic_iformat); return 0; }