diff options
Diffstat (limited to 'ffmpeg/libavformat/flic.c')
| -rw-r--r-- | ffmpeg/libavformat/flic.c | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/flic.c b/ffmpeg/libavformat/flic.c new file mode 100644 index 0000000..8d49116 --- /dev/null +++ b/ffmpeg/libavformat/flic.c @@ -0,0 +1,269 @@ +/* + * 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; +} + +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->codec->codec_type = AVMEDIA_TYPE_VIDEO; + st->codec->codec_id = AV_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 (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->codec->block_align = AV_RL32(&preamble[0]); + ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; + ast->codec->codec_id = AV_CODEC_ID_PCM_U8; + ast->codec->codec_tag = 0; + ast->codec->sample_rate = FLIC_TFTD_SAMPLE_RATE; + ast->codec->channels = 1; + 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 */ + avpriv_set_pts_info(st, 64, ast->codec->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_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) { + 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) { + + 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_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) */ + 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_free_packet(pkt); + ret = AVERROR(EIO); + } + + packet_read = 1; + } else { + /* not interested in this chunk */ + avio_skip(pb, size - 6); + } + } + + return 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, +}; |