PeerStreamer

/*

 * 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/intreadwrite.h"

#include "avformat.h"

#include "libavcore/audioconvert.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;

}

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, *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 (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 = AVMEDIA_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);

    /* peek at the preamble to detect TFTD videos - they seem to always start with an audio chunk */

    if (get_buffer(pb, preamble, FLIC_PREAMBLE_SIZE) != FLIC_PREAMBLE_SIZE) {

        av_log(s, AV_LOG_ERROR, "Failed to peek at preamble\n");

        return AVERROR(EIO);

    }

    url_fseek(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 = av_new_stream(s, 1);

        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->codec->block_align = AV_RL32(&preamble[0]);

        ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;

        ast->codec->codec_id = CODEC_ID_PCM_U8;

        ast->codec->codec_tag = 0;

        ast->codec->sample_rate = FLIC_TFTD_SAMPLE_RATE;

        ast->codec->channels = 1;

        ast->codec->sample_fmt = AV_SAMPLE_FMT_U8;

        ast->codec->bit_rate = st->codec->sample_rate * 8;

        ast->codec->bits_per_coded_sample = 8;

        ast->codec->channel_layout = AV_CH_LAYOUT_MONO;

        ast->codec->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 */

        av_set_pts_info(st, 64, ast->codec->block_align, FLIC_TFTD_SAMPLE_RATE);

        av_set_pts_info(ast, 64, 1, FLIC_TFTD_SAMPLE_RATE);

    } else 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 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) */

            url_fseek(pb, 10, SEEK_CUR);

            pkt->stream_index = flic->audio_stream_index;

            pkt->pos = url_ftell(pb);

            ret = get_buffer(pb, pkt->data, size);

            if (ret != 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 ff_flic_demuxer = {

    "flic",

    NULL_IF_CONFIG_SMALL("FLI/FLC/FLX animation format"),

    sizeof(FlicDemuxContext),

    flic_probe,

    flic_read_header,

    flic_read_packet,

};