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