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FFmpeg/libavformat/flic.c
Andreas Rheinhardt bc70684e74 avformat: Constify all muxer/demuxers 
This is possible now that the next-API is gone.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 11:48:06 -03:00

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/*
* 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(const 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, ret;
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 ((ret = ff_alloc_extradata(st->codecpar, FLIC_HEADER_SIZE)) < 0)
return ret;
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 */
if ((ret = ff_alloc_extradata(st->codecpar, 12)) < 0)
return ret;
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];
int64_t pos = avio_tell(pb);
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 ((ret = av_new_packet(pkt, size)) < 0)
return ret;
pkt->stream_index = flic->video_stream_index;
pkt->pos = pos;
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) {
ret = AVERROR(EIO);
}
pkt->flags = flic->frame_number == 0 ? AV_PKT_FLAG_KEY : 0;
pkt->pts = flic->frame_number;
if (flic->frame_number == 0)
av_add_index_entry(s->streams[flic->video_stream_index], pkt->pos, pkt->pts, pkt->size, 0, AVINDEX_KEYFRAME);
packet_read = 1;
flic->frame_number++;
} else if (magic == FLIC_TFTD_CHUNK_AUDIO) {
if ((ret = av_new_packet(pkt, size)) < 0)
return ret;
/* 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 = pos;
pkt->flags = AV_PKT_FLAG_KEY;
ret = avio_read(pb, pkt->data, size);
if (ret != size) {
ret = AVERROR(EIO);
break;
}
packet_read = 1;
} else {
/* not interested in this chunk */
avio_skip(pb, size - 6);
}
}
return avio_feof(pb) ? AVERROR_EOF : ret;
}
static int flic_read_seek(AVFormatContext *s, int stream_index,
int64_t pts, int flags)
{
FlicDemuxContext *flic = s->priv_data;
AVStream *st = s->streams[stream_index];
int64_t pos, ts;
int index;
if (!st->internal->index_entries || stream_index != flic->video_stream_index)
return -1;
index = av_index_search_timestamp(st, pts, flags);
if (index < 0)
index = av_index_search_timestamp(st, pts, flags ^ AVSEEK_FLAG_BACKWARD);
if (index < 0)
return -1;
pos = st->internal->index_entries[index].pos;
ts = st->internal->index_entries[index].timestamp;
flic->frame_number = ts;
avio_seek(s->pb, pos, SEEK_SET);
return 0;
}
const 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,
.read_seek = flic_read_seek,
};
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