mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-30 21:26:13 +02:00
![Derek Buitenhuis](/assets/img/avatar_default.png)
* commit '9200514ad8717c63f82101dc394f4378854325bf': lavf: replace AVStream.codec with AVStream.codecpar This has been a HUGE effort from: - Derek Buitenhuis <derek.buitenhuis@gmail.com> - Hendrik Leppkes <h.leppkes@gmail.com> - wm4 <nfxjfg@googlemail.com> - Clément Bœsch <clement@stupeflix.com> - James Almer <jamrial@gmail.com> - Michael Niedermayer <michael@niedermayer.cc> - Rostislav Pehlivanov <atomnuker@gmail.com> Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
198 lines
5.9 KiB
C
198 lines
5.9 KiB
C
/*
|
|
* American Laser Games MM Format Demuxer
|
|
* Copyright (c) 2006 Peter Ross
|
|
*
|
|
* 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
|
|
* American Laser Games MM Format Demuxer
|
|
* by Peter Ross (pross@xvid.org)
|
|
*
|
|
* The MM format was used by IBM-PC ports of ALG's "arcade shooter" games,
|
|
* including Mad Dog McCree and Crime Patrol.
|
|
*
|
|
* Technical details here:
|
|
* http://wiki.multimedia.cx/index.php?title=American_Laser_Games_MM
|
|
*/
|
|
|
|
#include "libavutil/channel_layout.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
#define MM_PREAMBLE_SIZE 6
|
|
|
|
#define MM_TYPE_HEADER 0x0
|
|
#define MM_TYPE_INTER 0x5
|
|
#define MM_TYPE_INTRA 0x8
|
|
#define MM_TYPE_INTRA_HH 0xc
|
|
#define MM_TYPE_INTER_HH 0xd
|
|
#define MM_TYPE_INTRA_HHV 0xe
|
|
#define MM_TYPE_INTER_HHV 0xf
|
|
#define MM_TYPE_AUDIO 0x15
|
|
#define MM_TYPE_PALETTE 0x31
|
|
|
|
#define MM_HEADER_LEN_V 0x16 /* video only */
|
|
#define MM_HEADER_LEN_AV 0x18 /* video + audio */
|
|
|
|
#define MM_PALETTE_COUNT 128
|
|
#define MM_PALETTE_SIZE (MM_PALETTE_COUNT*3)
|
|
|
|
typedef struct MmDemuxContext {
|
|
unsigned int audio_pts, video_pts;
|
|
} MmDemuxContext;
|
|
|
|
static int probe(AVProbeData *p)
|
|
{
|
|
int len, type, fps, w, h;
|
|
if (p->buf_size < MM_HEADER_LEN_AV + MM_PREAMBLE_SIZE)
|
|
return 0;
|
|
/* the first chunk is always the header */
|
|
if (AV_RL16(&p->buf[0]) != MM_TYPE_HEADER)
|
|
return 0;
|
|
len = AV_RL32(&p->buf[2]);
|
|
if (len != MM_HEADER_LEN_V && len != MM_HEADER_LEN_AV)
|
|
return 0;
|
|
fps = AV_RL16(&p->buf[8]);
|
|
w = AV_RL16(&p->buf[12]);
|
|
h = AV_RL16(&p->buf[14]);
|
|
if (!fps || fps > 60 || !w || w > 2048 || !h || h > 2048)
|
|
return 0;
|
|
type = AV_RL16(&p->buf[len]);
|
|
if (!type || type > 0x31)
|
|
return 0;
|
|
|
|
/* only return half certainty since this check is a bit sketchy */
|
|
return AVPROBE_SCORE_EXTENSION;
|
|
}
|
|
|
|
static int read_header(AVFormatContext *s)
|
|
{
|
|
MmDemuxContext *mm = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
AVStream *st;
|
|
|
|
unsigned int type, length;
|
|
unsigned int frame_rate, width, height;
|
|
|
|
type = avio_rl16(pb);
|
|
length = avio_rl32(pb);
|
|
|
|
if (type != MM_TYPE_HEADER)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
/* read header */
|
|
avio_rl16(pb); /* total number of chunks */
|
|
frame_rate = avio_rl16(pb);
|
|
avio_rl16(pb); /* ibm-pc video bios mode */
|
|
width = avio_rl16(pb);
|
|
height = avio_rl16(pb);
|
|
avio_skip(pb, length - 10); /* unknown data */
|
|
|
|
/* video stream */
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_MMVIDEO;
|
|
st->codecpar->codec_tag = 0; /* no fourcc */
|
|
st->codecpar->width = width;
|
|
st->codecpar->height = height;
|
|
avpriv_set_pts_info(st, 64, 1, frame_rate);
|
|
|
|
/* audio stream */
|
|
if (length == MM_HEADER_LEN_AV) {
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->codec_tag = 0; /* no fourcc */
|
|
st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
|
|
st->codecpar->channels = 1;
|
|
st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
|
|
st->codecpar->sample_rate = 8000;
|
|
avpriv_set_pts_info(st, 64, 1, 8000); /* 8000 hz */
|
|
}
|
|
|
|
mm->audio_pts = 0;
|
|
mm->video_pts = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
MmDemuxContext *mm = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
unsigned char preamble[MM_PREAMBLE_SIZE];
|
|
unsigned int type, length;
|
|
|
|
while(1) {
|
|
|
|
if (avio_read(pb, preamble, MM_PREAMBLE_SIZE) != MM_PREAMBLE_SIZE) {
|
|
return AVERROR(EIO);
|
|
}
|
|
|
|
type = AV_RL16(&preamble[0]);
|
|
length = AV_RL16(&preamble[2]);
|
|
|
|
switch(type) {
|
|
case MM_TYPE_PALETTE :
|
|
case MM_TYPE_INTER :
|
|
case MM_TYPE_INTRA :
|
|
case MM_TYPE_INTRA_HH :
|
|
case MM_TYPE_INTER_HH :
|
|
case MM_TYPE_INTRA_HHV :
|
|
case MM_TYPE_INTER_HHV :
|
|
/* output preamble + data */
|
|
if (av_new_packet(pkt, length + MM_PREAMBLE_SIZE))
|
|
return AVERROR(ENOMEM);
|
|
memcpy(pkt->data, preamble, MM_PREAMBLE_SIZE);
|
|
if (avio_read(pb, pkt->data + MM_PREAMBLE_SIZE, length) != length)
|
|
return AVERROR(EIO);
|
|
pkt->size = length + MM_PREAMBLE_SIZE;
|
|
pkt->stream_index = 0;
|
|
pkt->pts = mm->video_pts;
|
|
if (type!=MM_TYPE_PALETTE)
|
|
mm->video_pts++;
|
|
return 0;
|
|
|
|
case MM_TYPE_AUDIO :
|
|
if (av_get_packet(s->pb, pkt, length)<0)
|
|
return AVERROR(ENOMEM);
|
|
pkt->stream_index = 1;
|
|
pkt->pts = mm->audio_pts++;
|
|
return 0;
|
|
|
|
default :
|
|
av_log(s, AV_LOG_INFO, "unknown chunk type 0x%x\n", type);
|
|
avio_skip(pb, length);
|
|
}
|
|
}
|
|
}
|
|
|
|
AVInputFormat ff_mm_demuxer = {
|
|
.name = "mm",
|
|
.long_name = NULL_IF_CONFIG_SMALL("American Laser Games MM"),
|
|
.priv_data_size = sizeof(MmDemuxContext),
|
|
.read_probe = probe,
|
|
.read_header = read_header,
|
|
.read_packet = read_packet,
|
|
};
|