/* * 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 * 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 games "Magic Carpet" and "X-COM: Terror from the Deep". */ #include "libavutil/channel_layout.h"#include "libavutil/intreadwrite.h"#include "avformat.h"#include "internal.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_TFTD_CHUNK_AUDIO 0xAAAA /* Audio chunk. Used in Terror from the Deep.                                        Has 10 B extra header not accounted for in the chunk header */#define FLIC_TFTD_SAMPLE_RATE 22050 #define FLIC_HEADER_SIZE 128#define FLIC_PREAMBLE_SIZE 6 typedef struct FlicDemuxContext {    int video_stream_index;    int audio_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 - 1;} static int flic_read_header(AVFormatContext *s){    FlicDemuxContext *flic = s->priv_data;    AVIOContext *pb = s->pb;    unsigned char header[FLIC_HEADER_SIZE];    AVStream *st, *ast;    int speed;    int magic_number;    unsigned char preamble[FLIC_PREAMBLE_SIZE];     flic->frame_number = 0;     /* load the whole header and pull out the width and height */    if (avio_read(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 = avformat_new_stream(s, NULL);    if (!st)        return AVERROR(ENOMEM);    flic->video_stream_index = st->index;    st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;    st->codecpar->codec_id = AV_CODEC_ID_FLIC;    st->codecpar->codec_tag = 0;  /* no fourcc */    st->codecpar->width = AV_RL16(&header[0x08]);    st->codecpar->height = AV_RL16(&header[0x0A]);     if (!st->codecpar->width || !st->codecpar->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->codecpar->width  = 640;        st->codecpar->height = 480;    }     /* send over the whole 128-byte FLIC header */    if (ff_alloc_extradata(st->codecpar, FLIC_HEADER_SIZE))        return AVERROR(ENOMEM);    memcpy(st->codecpar->extradata, header, FLIC_HEADER_SIZE);     /* peek at the preamble to detect TFTD videos - they seem to always start with an audio chunk */    if (avio_read(pb, preamble, FLIC_PREAMBLE_SIZE) != FLIC_PREAMBLE_SIZE) {        av_log(s, AV_LOG_ERROR, "Failed to peek at preamble\n");        return AVERROR(EIO);    }     avio_seek(pb, -FLIC_PREAMBLE_SIZE, SEEK_CUR);     /* Time to figure out the framerate:     * If the first preamble's magic number is 0xAAAA then this file is from     * X-COM: Terror from the Deep. If on the other hand there is a FLIC chunk     * magic number at offset 0x10 assume this file is from Magic Carpet instead.     * If neither of the above is true then this is a normal FLIC file.     */    if (AV_RL16(&preamble[4]) == FLIC_TFTD_CHUNK_AUDIO) {        /* TFTD videos have an extra 22050 Hz 8-bit mono audio stream */        ast = avformat_new_stream(s, NULL);        if (!ast)            return AVERROR(ENOMEM);         flic->audio_stream_index = ast->index;         /* all audio frames are the same size, so use the size of the first chunk for block_align */        ast->codecpar->block_align = AV_RL32(&preamble[0]);        ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;        ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;        ast->codecpar->codec_tag = 0;        ast->codecpar->sample_rate = FLIC_TFTD_SAMPLE_RATE;        ast->codecpar->channels = 1;        ast->codecpar->bit_rate = st->codecpar->sample_rate * 8;        ast->codecpar->bits_per_coded_sample = 8;        ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;        ast->codecpar->extradata_size = 0;         /* Since the header information is incorrect we have to figure out the         * framerate using block_align and the fact that the audio is 22050 Hz.         * We usually have two cases: 2205 -> 10 fps and 1470 -> 15 fps */        avpriv_set_pts_info(st, 64, ast->codecpar->block_align, FLIC_TFTD_SAMPLE_RATE);        avpriv_set_pts_info(ast, 64, 1, FLIC_TFTD_SAMPLE_RATE);    } else if (AV_RL16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) {        avpriv_set_pts_info(st, 64, FLIC_MC_SPEED, 70);         /* rewind the stream since the first chunk is at offset 12 */        avio_seek(pb, 12, SEEK_SET);         /* send over abbreviated FLIC header chunk */        av_freep(&st->codecpar->extradata);        if (ff_alloc_extradata(st->codecpar, 12))            return AVERROR(ENOMEM);        memcpy(st->codecpar->extradata, header, 12);     } else if (magic_number == FLIC_FILE_MAGIC_1) {        avpriv_set_pts_info(st, 64, speed, 70);    } else if ((magic_number == FLIC_FILE_MAGIC_2) ||               (magic_number == FLIC_FILE_MAGIC_3)) {        avpriv_set_pts_info(st, 64, speed, 1000);    } else {        av_log(s, AV_LOG_ERROR, "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;    AVIOContext *pb = s->pb;    int packet_read = 0;    unsigned int size;    int magic;    int ret = 0;    unsigned char preamble[FLIC_PREAMBLE_SIZE];     while (!packet_read && !avio_feof(pb)) {         if ((ret = avio_read(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 = avio_tell(pb);            memcpy(pkt->data, preamble, FLIC_PREAMBLE_SIZE);            ret = avio_read(pb, pkt->data + FLIC_PREAMBLE_SIZE,                size - FLIC_PREAMBLE_SIZE);            if (ret != size - FLIC_PREAMBLE_SIZE) {                av_packet_unref(pkt);                ret = AVERROR(EIO);            }            packet_read = 1;        } else if (magic == FLIC_TFTD_CHUNK_AUDIO) {            if (av_new_packet(pkt, size)) {                ret = AVERROR(EIO);                break;            }             /* skip useless 10B sub-header (yes, it's not accounted for in the chunk header) */            avio_skip(pb, 10);             pkt->stream_index = flic->audio_stream_index;            pkt->pos = avio_tell(pb);            ret = avio_read(pb, pkt->data, size);             if (ret != size) {                av_packet_unref(pkt);                ret = AVERROR(EIO);            }             packet_read = 1;        } else {            /* not interested in this chunk */            avio_skip(pb, size - 6);        }    }     return avio_feof(pb) ? AVERROR_EOF : ret;} AVInputFormat ff_flic_demuxer = {    .name           = "flic",    .long_name      = NULL_IF_CONFIG_SMALL("FLI/FLC/FLX animation"),    .priv_data_size = sizeof(FlicDemuxContext),    .read_probe     = flic_probe,    .read_header    = flic_read_header,    .read_packet    = flic_read_packet,};