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/*
* 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
*/
/** |
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* @file |
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* Funcom ISS file demuxer
* @author Jaikrishnan Menon |
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* @see http://wiki.multimedia.cx/index.php?title=FunCom_ISS |
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*/
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#include "libavutil/channel_layout.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#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;
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static void get_token(AVIOContext *s, char *buf, int maxlen) |
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{
int i = 0;
char c;
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while ((c = avio_r8(s))) { |
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if(c == ' ')
break;
if (i < maxlen-1)
buf[i++] = c;
}
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if(!c) |
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avio_r8(s); |
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|
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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;
}
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static av_cold int iss_read_header(AVFormatContext *s) |
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{
IssDemuxContext *iss = s->priv_data; |
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AVIOContext *pb = s->pb; |
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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 |
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if (sscanf(token, "%d", &iss->packet_size) != 1) {
av_log(s, AV_LOG_ERROR, "Failed parsing packet size\n");
return AVERROR_INVALIDDATA;
} |
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get_token(pb, token, sizeof(token)); //File ID
get_token(pb, token, sizeof(token)); //out size
get_token(pb, token, sizeof(token)); //stereo |
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if (sscanf(token, "%d", &stereo) != 1) {
av_log(s, AV_LOG_ERROR, "Failed parsing stereo flag\n");
return AVERROR_INVALIDDATA;
} |
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get_token(pb, token, sizeof(token)); //Unknown1
get_token(pb, token, sizeof(token)); //RateDivisor |
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if (sscanf(token, "%d", &rate_divisor) != 1) {
av_log(s, AV_LOG_ERROR, "Failed parsing rate_divisor\n");
return AVERROR_INVALIDDATA;
} |
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get_token(pb, token, sizeof(token)); //Unknown2
get_token(pb, token, sizeof(token)); //Version ID
get_token(pb, token, sizeof(token)); //Size
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if (iss->packet_size <= 0) {
av_log(s, AV_LOG_ERROR, "packet_size %d is invalid\n", iss->packet_size);
return AVERROR_INVALIDDATA;
}
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iss->sample_start_pos = avio_tell(pb); |
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st = avformat_new_stream(s, NULL); |
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if (!st)
return AVERROR(ENOMEM); |
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_ISS; |
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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;
} |
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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; |
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avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate); |
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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);
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if(ret != iss->packet_size)
return AVERROR(EIO); |
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pkt->stream_index = 0; |
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pkt->pts = avio_tell(s->pb) - iss->sample_start_pos; |
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if(s->streams[0]->codec->channels > 0)
pkt->pts /= s->streams[0]->codec->channels*2;
return 0;
}
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AVInputFormat ff_iss_demuxer = { |
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.name = "iss", |
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.long_name = NULL_IF_CONFIG_SMALL("Funcom ISS"), |
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.priv_data_size = sizeof(IssDemuxContext),
.read_probe = iss_probe,
.read_header = iss_read_header,
.read_packet = iss_read_packet, |
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}; |