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/*
* Discworld II BMV demuxer
* Copyright (c) 2011 Konstantin Shishkov.
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/channel_layout.h"
#include "avformat.h"
#include "internal.h"
enum BMVFlags {
BMV_NOP = 0,
BMV_END,
BMV_DELTA,
BMV_INTRA,
BMV_AUDIO = 0x20,
};
typedef struct BMVContext {
uint8_t *packet;
int size;
int get_next;
int64_t audio_pos;
} BMVContext;
static int bmv_read_header(AVFormatContext *s)
{
AVStream *st, *ast;
BMVContext *c = s->priv_data;
st = avformat_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = AV_CODEC_ID_BMV_VIDEO;
st->codec->width = 640;
st->codec->height = 429;
st->codec->pix_fmt = AV_PIX_FMT_PAL8;
avpriv_set_pts_info(st, 16, 1, 12);
ast = avformat_new_stream(s, 0);
if (!ast)
return AVERROR(ENOMEM);
ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codec->codec_id = AV_CODEC_ID_BMV_AUDIO;
ast->codec->channels = 2;
ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
ast->codec->sample_rate = 22050;
avpriv_set_pts_info(ast, 16, 1, 22050);
c->get_next = 1;
c->audio_pos = 0;
return 0;
}
static int bmv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
BMVContext *c = s->priv_data;
int type, err;
while (c->get_next) {
if (s->pb->eof_reached)
return AVERROR_EOF;
type = avio_r8(s->pb);
if (type == BMV_NOP)
continue;
if (type == BMV_END)
return AVERROR_EOF;
c->size = avio_rl24(s->pb);
if (!c->size)
return AVERROR_INVALIDDATA;
if ((err = av_reallocp(&c->packet, c->size + 1)) < 0)
return err;
c->packet[0] = type;
if (avio_read(s->pb, c->packet + 1, c->size) != c->size)
return AVERROR(EIO);
if (type & BMV_AUDIO) {
int audio_size = c->packet[1] * 65 + 1;
if (audio_size >= c->size) {
av_log(s, AV_LOG_ERROR, "Reported audio size %d is bigger than packet size (%d)\n",
audio_size, c->size);
return AVERROR_INVALIDDATA;
}
if (av_new_packet(pkt, audio_size) < 0)
return AVERROR(ENOMEM);
memcpy(pkt->data, c->packet + 1, pkt->size);
pkt->stream_index = 1;
pkt->pts = c->audio_pos;
pkt->duration = c->packet[1] * 32;
c->audio_pos += pkt->duration;
c->get_next = 0;
return pkt->size;
} else
break;
}
if (av_new_packet(pkt, c->size + 1) < 0)
return AVERROR(ENOMEM);
pkt->stream_index = 0;
c->get_next = 1;
memcpy(pkt->data, c->packet, pkt->size);
return pkt->size;
}
static int bmv_read_close(AVFormatContext *s)
{
BMVContext *c = s->priv_data;
av_freep(&c->packet);
return 0;
}
AVInputFormat ff_bmv_demuxer = {
.name = "bmv",
.long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV"),
.priv_data_size = sizeof(BMVContext),
.read_header = bmv_read_header,
.read_packet = bmv_read_packet,
.read_close = bmv_read_close,
.extensions = "bmv",
};
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