mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-15 03:34:56 +00:00
118e91f3d8
possible. For example you can do: ffmpeg -i i.dv -i audio_track.mp3 -map 0.0 -map 1.0 \ -vcodec copy -acodec pcm_s16le out.dv * Preparations for getting rid of DVAUDIO codec, DV stream really contains PCM audio, so there's no codec needed if we have a decent demuxer. * Providing entry points for dv1394 write support. Originally committed as revision 2174 to svn://svn.ffmpeg.org/ffmpeg/trunk
165 lines
4.0 KiB
C
165 lines
4.0 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"
|
|
#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,
|
|
unsigned char *buf, int size, int force_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;
|
|
}
|