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FFmpeg/libavformat/flic.c

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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;
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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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]);
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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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");
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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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;
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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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 */
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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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 */
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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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;
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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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 ((ret = av_new_packet(pkt, size)) < 0)
return ret;
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) {
ret = AVERROR(EIO);
}
packet_read = 1;
} 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 = avio_tell(pb);
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;
}
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,
};