270 lines
9.2 KiB
C
270 lines
9.2 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 file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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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 handles
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* special FLIs from the PC games "Magic Carpet" and "X-COM: Terror from the Deep".
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*/
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#include "libavutil/channel_layout.h"
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.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_FILE_MAGIC_3 0xAF44 /* Flic Type for Extended FLX Format which
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originated in Dave's Targa Animator (DTA) */
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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_SPEED 5 /* speed for Magic Carpet game FLIs */
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#define FLIC_DEFAULT_SPEED 5 /* for FLIs that have 0 speed */
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#define FLIC_TFTD_CHUNK_AUDIO 0xAAAA /* Audio chunk. Used in Terror from the Deep.
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Has 10 B extra header not accounted for in the chunk header */
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#define FLIC_TFTD_SAMPLE_RATE 22050
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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 video_stream_index;
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int audio_stream_index;
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int frame_number;
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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 < FLIC_HEADER_SIZE)
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return 0;
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magic_number = AV_RL16(&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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(magic_number != FLIC_FILE_MAGIC_3))
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return 0;
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if(AV_RL16(&p->buf[0x10]) != FLIC_CHUNK_MAGIC_1){
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if(AV_RL32(&p->buf[0x10]) > 2000)
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return 0;
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}
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if( AV_RL16(&p->buf[0x08]) > 4096
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|| AV_RL16(&p->buf[0x0A]) > 4096)
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return 0;
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return AVPROBE_SCORE_MAX - 1;
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}
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static int flic_read_header(AVFormatContext *s)
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{
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FlicDemuxContext *flic = s->priv_data;
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AVIOContext *pb = s->pb;
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unsigned char header[FLIC_HEADER_SIZE];
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AVStream *st, *ast;
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int speed;
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int magic_number;
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unsigned char preamble[FLIC_PREAMBLE_SIZE];
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flic->frame_number = 0;
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/* load the whole header and pull out the width and height */
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if (avio_read(pb, header, FLIC_HEADER_SIZE) != FLIC_HEADER_SIZE)
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return AVERROR(EIO);
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magic_number = AV_RL16(&header[4]);
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speed = AV_RL32(&header[0x10]);
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if (speed == 0)
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speed = FLIC_DEFAULT_SPEED;
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/* initialize the decoder streams */
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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flic->video_stream_index = st->index;
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codec->codec_id = AV_CODEC_ID_FLIC;
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st->codec->codec_tag = 0; /* no fourcc */
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st->codec->width = AV_RL16(&header[0x08]);
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st->codec->height = AV_RL16(&header[0x0A]);
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if (!st->codec->width || !st->codec->height) {
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/* Ugly hack needed for the following sample: */
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/* http://samples.mplayerhq.hu/fli-flc/fli-bugs/specular.flc */
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av_log(s, AV_LOG_WARNING,
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"File with no specified width/height. Trying 640x480.\n");
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st->codec->width = 640;
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st->codec->height = 480;
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}
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/* send over the whole 128-byte FLIC header */
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if (ff_alloc_extradata(st->codec, FLIC_HEADER_SIZE))
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return AVERROR(ENOMEM);
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memcpy(st->codec->extradata, header, FLIC_HEADER_SIZE);
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/* peek at the preamble to detect TFTD videos - they seem to always start with an audio chunk */
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if (avio_read(pb, preamble, FLIC_PREAMBLE_SIZE) != FLIC_PREAMBLE_SIZE) {
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av_log(s, AV_LOG_ERROR, "Failed to peek at preamble\n");
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return AVERROR(EIO);
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}
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avio_seek(pb, -FLIC_PREAMBLE_SIZE, SEEK_CUR);
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/* Time to figure out the framerate:
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* If the first preamble's magic number is 0xAAAA then this file is from
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* X-COM: Terror from the Deep. If on the other hand there is a FLIC chunk
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* magic number at offset 0x10 assume this file is from Magic Carpet instead.
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* If neither of the above is true then this is a normal FLIC file.
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*/
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if (AV_RL16(&preamble[4]) == FLIC_TFTD_CHUNK_AUDIO) {
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/* TFTD videos have an extra 22050 Hz 8-bit mono audio stream */
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ast = avformat_new_stream(s, NULL);
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if (!ast)
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return AVERROR(ENOMEM);
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flic->audio_stream_index = ast->index;
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/* all audio frames are the same size, so use the size of the first chunk for block_align */
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ast->codec->block_align = AV_RL32(&preamble[0]);
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ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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ast->codec->codec_id = AV_CODEC_ID_PCM_U8;
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ast->codec->codec_tag = 0;
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ast->codec->sample_rate = FLIC_TFTD_SAMPLE_RATE;
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ast->codec->channels = 1;
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ast->codec->bit_rate = st->codec->sample_rate * 8;
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ast->codec->bits_per_coded_sample = 8;
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ast->codec->channel_layout = AV_CH_LAYOUT_MONO;
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ast->codec->extradata_size = 0;
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/* Since the header information is incorrect we have to figure out the
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* framerate using block_align and the fact that the audio is 22050 Hz.
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* We usually have two cases: 2205 -> 10 fps and 1470 -> 15 fps */
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avpriv_set_pts_info(st, 64, ast->codec->block_align, FLIC_TFTD_SAMPLE_RATE);
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avpriv_set_pts_info(ast, 64, 1, FLIC_TFTD_SAMPLE_RATE);
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} else if (AV_RL16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) {
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avpriv_set_pts_info(st, 64, FLIC_MC_SPEED, 70);
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/* rewind the stream since the first chunk is at offset 12 */
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avio_seek(pb, 12, SEEK_SET);
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/* send over abbreviated FLIC header chunk */
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av_freep(&st->codec->extradata);
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if (ff_alloc_extradata(st->codec, 12))
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return AVERROR(ENOMEM);
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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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avpriv_set_pts_info(st, 64, speed, 70);
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} else if ((magic_number == FLIC_FILE_MAGIC_2) ||
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(magic_number == FLIC_FILE_MAGIC_3)) {
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avpriv_set_pts_info(st, 64, speed, 1000);
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} else {
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av_log(s, AV_LOG_ERROR, "Invalid or unsupported magic chunk in file\n");
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return AVERROR_INVALIDDATA;
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}
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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 = s->priv_data;
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AVIOContext *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 = avio_read(pb, preamble, FLIC_PREAMBLE_SIZE)) !=
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FLIC_PREAMBLE_SIZE) {
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ret = AVERROR(EIO);
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break;
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}
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size = AV_RL32(&preamble[0]);
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magic = AV_RL16(&preamble[4]);
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if (((magic == FLIC_CHUNK_MAGIC_1) || (magic == FLIC_CHUNK_MAGIC_2)) && size > FLIC_PREAMBLE_SIZE) {
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if (av_new_packet(pkt, size)) {
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ret = AVERROR(EIO);
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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->frame_number++;
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pkt->pos = avio_tell(pb);
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memcpy(pkt->data, preamble, FLIC_PREAMBLE_SIZE);
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ret = avio_read(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(EIO);
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}
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packet_read = 1;
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} else if (magic == FLIC_TFTD_CHUNK_AUDIO) {
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if (av_new_packet(pkt, size)) {
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ret = AVERROR(EIO);
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break;
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}
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/* skip useless 10B sub-header (yes, it's not accounted for in the chunk header) */
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avio_skip(pb, 10);
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pkt->stream_index = flic->audio_stream_index;
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pkt->pos = avio_tell(pb);
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ret = avio_read(pb, pkt->data, size);
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if (ret != size) {
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av_free_packet(pkt);
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ret = AVERROR(EIO);
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}
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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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avio_skip(pb, size - 6);
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}
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}
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return ret;
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}
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AVInputFormat ff_flic_demuxer = {
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.name = "flic",
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.long_name = NULL_IF_CONFIG_SMALL("FLI/FLC/FLX animation"),
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.priv_data_size = sizeof(FlicDemuxContext),
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.read_probe = flic_probe,
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.read_header = flic_read_header,
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.read_packet = flic_read_packet,
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};
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