| /* |
| * FLI/FLC Animation File Demuxer |
| * Copyright (c) 2003 The ffmpeg Project |
| * |
| * 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 libavformat/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 "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| |
| #define FLIC_FILE_MAGIC_1 0xAF11 |
| #define FLIC_FILE_MAGIC_2 0xAF12 |
| #define FLIC_FILE_MAGIC_3 0xAF44 /* Flic Type for Extended FLX Format which |
| originated in Dave's Targa Animator (DTA) */ |
| #define FLIC_CHUNK_MAGIC_1 0xF1FA |
| #define FLIC_CHUNK_MAGIC_2 0xF5FA |
| #define FLIC_MC_SPEED 5 /* speed for Magic Carpet game FLIs */ |
| #define FLIC_DEFAULT_SPEED 5 /* for FLIs that have 0 speed */ |
| |
| #define FLIC_HEADER_SIZE 128 |
| #define FLIC_PREAMBLE_SIZE 6 |
| |
| typedef struct FlicDemuxContext { |
| int video_stream_index; |
| int frame_number; |
| } FlicDemuxContext; |
| |
| static int flic_probe(AVProbeData *p) |
| { |
| int magic_number; |
| |
| if(p->buf_size < FLIC_HEADER_SIZE) |
| return 0; |
| |
| magic_number = AV_RL16(&p->buf[4]); |
| if ((magic_number != FLIC_FILE_MAGIC_1) && |
| (magic_number != FLIC_FILE_MAGIC_2) && |
| (magic_number != FLIC_FILE_MAGIC_3)) |
| return 0; |
| |
| if(AV_RL16(&p->buf[0x10]) != FLIC_CHUNK_MAGIC_1){ |
| if(AV_RL32(&p->buf[0x10]) > 2000) |
| return 0; |
| } |
| |
| if( AV_RL16(&p->buf[0x08]) > 4096 |
| || AV_RL16(&p->buf[0x0A]) > 4096) |
| return 0; |
| |
| |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| static int flic_read_header(AVFormatContext *s, |
| AVFormatParameters *ap) |
| { |
| FlicDemuxContext *flic = s->priv_data; |
| ByteIOContext *pb = s->pb; |
| unsigned char header[FLIC_HEADER_SIZE]; |
| AVStream *st; |
| int speed; |
| int magic_number; |
| |
| flic->frame_number = 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(EIO); |
| |
| magic_number = AV_RL16(&header[4]); |
| speed = AV_RL32(&header[0x10]); |
| if (speed == 0) |
| speed = FLIC_DEFAULT_SPEED; |
| |
| /* initialize the decoder streams */ |
| st = av_new_stream(s, 0); |
| if (!st) |
| return AVERROR(ENOMEM); |
| 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 = AV_RL16(&header[0x08]); |
| st->codec->height = AV_RL16(&header[0x0A]); |
| |
| if (!st->codec->width || !st->codec->height) { |
| /* Ugly hack needed for the following sample: */ |
| /* http://samples.mplayerhq.hu/fli-flc/fli-bugs/specular.flc */ |
| av_log(s, AV_LOG_WARNING, |
| "File with no specified width/height. Trying 640x480.\n"); |
| st->codec->width = 640; |
| st->codec->height = 480; |
| } |
| |
| /* 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); |
| |
| /* 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 (AV_RL16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) { |
| |
| av_set_pts_info(st, 64, FLIC_MC_SPEED, 70); |
| |
| /* 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) { |
| av_set_pts_info(st, 64, speed, 70); |
| } else if ((magic_number == FLIC_FILE_MAGIC_2) || |
| (magic_number == FLIC_FILE_MAGIC_3)) { |
| av_set_pts_info(st, 64, speed, 1000); |
| } else { |
| av_log(s, AV_LOG_INFO, "Invalid or unsupported magic chunk in file\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| return 0; |
| } |
| |
| static int flic_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| FlicDemuxContext *flic = 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(EIO); |
| break; |
| } |
| |
| size = AV_RL32(&preamble[0]); |
| magic = AV_RL16(&preamble[4]); |
| |
| if (((magic == FLIC_CHUNK_MAGIC_1) || (magic == FLIC_CHUNK_MAGIC_2)) && size > FLIC_PREAMBLE_SIZE) { |
| if (av_new_packet(pkt, size)) { |
| ret = AVERROR(EIO); |
| break; |
| } |
| pkt->stream_index = flic->video_stream_index; |
| pkt->pts = flic->frame_number++; |
| pkt->pos = url_ftell(pb); |
| 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(EIO); |
| } |
| packet_read = 1; |
| } else { |
| /* not interested in this chunk */ |
| url_fseek(pb, size - 6, SEEK_CUR); |
| } |
| } |
| |
| return ret; |
| } |
| |
| AVInputFormat flic_demuxer = { |
| "flic", |
| NULL_IF_CONFIG_SMALL("FLI/FLC/FLX animation format"), |
| sizeof(FlicDemuxContext), |
| flic_probe, |
| flic_read_header, |
| flic_read_packet, |
| }; |