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/*
* 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"
#include "dvcore.h"
typedef struct DVDemuxContext {
int is_audio;
uint8_t buf[144000];
int size;
} DVDemuxContext;
/* raw input */
static int dv_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVStream *vst, *ast;
DVDemuxContext *c = s->priv_data;
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;
vst->codec.bit_rate = 25000000;
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;
c->is_audio = 0;
return 0;
}
static void __destruct_pkt(struct AVPacket *pkt)
{
pkt->data = NULL; pkt->size = 0;
return;
}
static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret;
DVDemuxContext *c = s->priv_data;
if (!c->is_audio) {
ret = get_buffer(&s->pb, c->buf, 4);
if (ret <= 0)
return -EIO;
c->size = dv_frame_profile(&c->buf[0])->frame_size;
ret = get_buffer(&s->pb, c->buf + 4, c->size - 4);
if (ret <= 0)
return -EIO;
}
av_init_packet(pkt);
pkt->destruct = __destruct_pkt;
pkt->data = c->buf;
pkt->size = c->size;
pkt->stream_index = c->is_audio;
pkt->flags |= PKT_FLAG_KEY;
c->is_audio = !c->is_audio;
return c->size;
}
static int dv_read_close(AVFormatContext *s)
{
return 0;
}
int dv_write_header(struct AVFormatContext *s)
{
DVMuxContext *c = s->priv_data;
if (s->nb_streams != 2 || dv_core_init(c, s->streams) != 0) {
fprintf(stderr, "Can't initialize DV format!\n"
"Make sure that you supply exactly two streams:\n"
" video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM\n");
return -1;
}
return 0;
}
int dv_write_packet(struct AVFormatContext *s,
int stream_index,
const uint8_t *buf, int size, int64_t pts)
{
DVMuxContext *c = s->priv_data;
if (stream_index == c->vst)
dv_assemble_frame(c, buf, NULL, 0);
else
dv_assemble_frame(c, NULL, buf, size);
if (c->has_audio && c->has_video) {
put_buffer(&s->pb, &c->frame_buf[0], c->sys->frame_size);
put_flush_packet(&s->pb);
}
return 0;
}
/*
* We might end up with some extra A/V data without matching counterpart.
* E.g. video data without enough audio to write the complete frame.
* Currently we simply drop the last frame. I don't know whether this
* is the best strategy of all
*/
int dv_write_trailer(struct AVFormatContext *s)
{
dv_core_delete((DVMuxContext *)s->priv_data);
return 0;
}
static AVInputFormat dv_iformat = {
"dv",
"DV video format",
sizeof(DVDemuxContext),
NULL,
dv_read_header,
dv_read_packet,
dv_read_close,
.extensions = "dv",
};
AVOutputFormat dv_oformat = {
"dv",
"DV video format",
NULL,
"dv",
sizeof(DVMuxContext),
CODEC_ID_PCM_S16LE,
CODEC_ID_DVVIDEO,
dv_write_header,
dv_write_packet,
dv_write_trailer,
};
int dv_init(void)
{
av_register_input_format(&dv_iformat);
av_register_output_format(&dv_oformat);
return 0;
}
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