mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
135 lines
3.0 KiB
C
135 lines
3.0 KiB
C
/*
|
|
* Raw DV format
|
|
* Copyright (c) 2002 Fabrice Bellard.
|
|
*
|
|
* This library 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 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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 this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include "avformat.h"
|
|
|
|
#define NTSC_FRAME_SIZE 120000
|
|
#define PAL_FRAME_SIZE 144000
|
|
|
|
typedef struct DVDemuxContext {
|
|
int is_audio;
|
|
} DVDemuxContext;
|
|
|
|
/* raw input */
|
|
static int dv_read_header(AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
AVStream *vst, *ast;
|
|
|
|
vst = av_new_stream(s, 0);
|
|
if (!vst)
|
|
return AVERROR_NOMEM;
|
|
vst->codec.codec_type = CODEC_TYPE_VIDEO;
|
|
vst->codec.codec_id = CODEC_ID_DVVIDEO;
|
|
|
|
#if 0
|
|
ast = av_new_stream(s, 1);
|
|
if (!ast)
|
|
return AVERROR_NOMEM;
|
|
|
|
ast->codec.codec_type = CODEC_TYPE_AUDIO;
|
|
ast->codec.codec_id = CODEC_ID_DVAUDIO;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/* XXX: build fake audio stream when DV audio decoder will be finished */
|
|
static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
int ret, size, dsf;
|
|
uint8_t buf[4];
|
|
|
|
ret = get_buffer(&s->pb, buf, 4);
|
|
if (ret <= 0)
|
|
return -EIO;
|
|
dsf = buf[3] & 0x80;
|
|
if (!dsf)
|
|
size = NTSC_FRAME_SIZE;
|
|
else
|
|
size = PAL_FRAME_SIZE;
|
|
|
|
if (av_new_packet(pkt, size) < 0)
|
|
return -EIO;
|
|
|
|
pkt->stream_index = 0;
|
|
memcpy(pkt->data, buf, 4);
|
|
ret = get_buffer(&s->pb, pkt->data + 4, size - 4);
|
|
if (ret <= 0) {
|
|
av_free_packet(pkt);
|
|
return -EIO;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int dv_read_close(AVFormatContext *s)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static AVInputFormat dv_iformat = {
|
|
"dv",
|
|
"DV video format",
|
|
sizeof(DVDemuxContext),
|
|
NULL,
|
|
dv_read_header,
|
|
dv_read_packet,
|
|
dv_read_close,
|
|
.extensions = "dv",
|
|
};
|
|
|
|
#if 0
|
|
int dv_write_header(struct AVFormatContext *s)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int dv_write_packet(struct AVFormatContext *s,
|
|
int stream_index,
|
|
unsigned char *buf, int size, int force_pts)
|
|
{
|
|
put_buffer(&s->pb, buf, size);
|
|
put_flush_packet(&s->pb);
|
|
return 0;
|
|
}
|
|
|
|
int dv_write_trailer(struct AVFormatContext *s)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat dv_oformat = {
|
|
"dv",
|
|
"DV video format",
|
|
NULL,
|
|
"dv",
|
|
0,
|
|
CODEC_ID_DVVIDEO,
|
|
CODEC_ID_DVAUDIO,
|
|
dv_write_header,
|
|
dv_write_packet,
|
|
dv_write_trailer,
|
|
};
|
|
#endif
|
|
|
|
int dv_init(void)
|
|
{
|
|
av_register_input_format(&dv_iformat);
|
|
// av_register_output_format(&dv_oformat);
|
|
return 0;
|
|
}
|