0,0 → 1,144 |
/* |
* ISS (.iss) file demuxer |
* Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net> |
* |
* 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 |
* Funcom ISS file demuxer |
* @author Jaikrishnan Menon |
* @see http://wiki.multimedia.cx/index.php?title=FunCom_ISS |
*/ |
|
#include "libavutil/channel_layout.h" |
#include "avformat.h" |
#include "internal.h" |
#include "libavutil/avstring.h" |
|
#define ISS_SIG "IMA_ADPCM_Sound" |
#define ISS_SIG_LEN 15 |
#define MAX_TOKEN_SIZE 20 |
|
typedef struct { |
int packet_size; |
int sample_start_pos; |
} IssDemuxContext; |
|
static void get_token(AVIOContext *s, char *buf, int maxlen) |
{ |
int i = 0; |
char c; |
|
while ((c = avio_r8(s))) { |
if(c == ' ') |
break; |
if (i < maxlen-1) |
buf[i++] = c; |
} |
|
if(!c) |
avio_r8(s); |
|
buf[i] = 0; /* Ensure null terminated, but may be truncated */ |
} |
|
static int iss_probe(AVProbeData *p) |
{ |
if (strncmp(p->buf, ISS_SIG, ISS_SIG_LEN)) |
return 0; |
|
return AVPROBE_SCORE_MAX; |
} |
|
static av_cold int iss_read_header(AVFormatContext *s) |
{ |
IssDemuxContext *iss = s->priv_data; |
AVIOContext *pb = s->pb; |
AVStream *st; |
char token[MAX_TOKEN_SIZE]; |
int stereo, rate_divisor; |
|
get_token(pb, token, sizeof(token)); //"IMA_ADPCM_Sound" |
get_token(pb, token, sizeof(token)); //packet size |
sscanf(token, "%d", &iss->packet_size); |
get_token(pb, token, sizeof(token)); //File ID |
get_token(pb, token, sizeof(token)); //out size |
get_token(pb, token, sizeof(token)); //stereo |
sscanf(token, "%d", &stereo); |
get_token(pb, token, sizeof(token)); //Unknown1 |
get_token(pb, token, sizeof(token)); //RateDivisor |
sscanf(token, "%d", &rate_divisor); |
get_token(pb, token, sizeof(token)); //Unknown2 |
get_token(pb, token, sizeof(token)); //Version ID |
get_token(pb, token, sizeof(token)); //Size |
|
if (iss->packet_size <= 0) { |
av_log(s, AV_LOG_ERROR, "packet_size %d is invalid\n", iss->packet_size); |
return AVERROR_INVALIDDATA; |
} |
|
iss->sample_start_pos = avio_tell(pb); |
|
st = avformat_new_stream(s, NULL); |
if (!st) |
return AVERROR(ENOMEM); |
st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_ISS; |
if (stereo) { |
st->codec->channels = 2; |
st->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
} else { |
st->codec->channels = 1; |
st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
} |
st->codec->sample_rate = 44100; |
if(rate_divisor > 0) |
st->codec->sample_rate /= rate_divisor; |
st->codec->bits_per_coded_sample = 4; |
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate |
* st->codec->bits_per_coded_sample; |
st->codec->block_align = iss->packet_size; |
avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate); |
|
return 0; |
} |
|
static int iss_read_packet(AVFormatContext *s, AVPacket *pkt) |
{ |
IssDemuxContext *iss = s->priv_data; |
int ret = av_get_packet(s->pb, pkt, iss->packet_size); |
|
if(ret != iss->packet_size) |
return AVERROR(EIO); |
|
pkt->stream_index = 0; |
pkt->pts = avio_tell(s->pb) - iss->sample_start_pos; |
if(s->streams[0]->codec->channels > 0) |
pkt->pts /= s->streams[0]->codec->channels*2; |
return 0; |
} |
|
AVInputFormat ff_iss_demuxer = { |
.name = "iss", |
.long_name = NULL_IF_CONFIG_SMALL("Funcom ISS"), |
.priv_data_size = sizeof(IssDemuxContext), |
.read_probe = iss_probe, |
.read_header = iss_read_header, |
.read_packet = iss_read_packet, |
}; |