mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-25 16:52:31 +00:00
137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/*
|
|
* Discworld II BMV demuxer
|
|
* Copyright (c) 2011 Konstantin Shishkov.
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#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",
|
|
};
|