mirror of https://git.ffmpeg.org/ffmpeg.git
586 lines
14 KiB
C
586 lines
14 KiB
C
/*
|
|
* NUT (de)muxer based on initial draft
|
|
* Copyright (c) 2003 Alex Beregszaszi
|
|
*
|
|
* 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 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
|
|
*
|
|
* NUT DRAFT can be found in MPlayer CVS at DOCS/tech/mpcf.txt
|
|
*
|
|
* Compatible with draft version 20030906
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* TODO:
|
|
* - checksumming
|
|
* - correct rate denom/nom and sample_mul
|
|
* - correct timestamp handling
|
|
* - index writing
|
|
* - info and index packet reading support
|
|
* - startcode searching for broken streams
|
|
* - subpacket support
|
|
* - handling of codec specific headers
|
|
*/
|
|
|
|
//#define DEBUG 1
|
|
|
|
#include "avformat.h"
|
|
#include "mpegaudio.h"
|
|
#include "avi.h"
|
|
|
|
//from /dev/random
|
|
|
|
#define MAIN_STARTCODE (0xF9526A6200000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'M')
|
|
#define STREAM_STARTCODE (0xD667773F00000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'S')
|
|
#define KEYFRAME_STARTCODE (0xCB86308700000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'K')
|
|
#define INDEX_STARTCODE (0xEBFCDE0E00000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'X')
|
|
#define INFO_STARTCODE (0xA37B643500000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'I')
|
|
|
|
typedef struct {
|
|
int curr_frame_start;
|
|
int last_frame_size;
|
|
int curr_frame_size;
|
|
} NUTContext;
|
|
|
|
static int bytes_left(ByteIOContext *bc)
|
|
{
|
|
return bc->buf_end - bc->buf_ptr;
|
|
}
|
|
|
|
static uint64_t get_v(ByteIOContext *bc)
|
|
{
|
|
uint64_t val = 0;
|
|
|
|
// for (; bytes_left(s)*8 > 0; )
|
|
for(; bytes_left(bc) > 0; )
|
|
{
|
|
int tmp = get_byte(bc);
|
|
|
|
if (tmp&0x80)
|
|
val= (val<<7) + tmp - 0x80;
|
|
else
|
|
return (val<<7) + tmp;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int64_t get_s(ByteIOContext *bc)
|
|
{
|
|
int64_t v = get_v(bc) + 1;
|
|
|
|
if (v&1)
|
|
return -(v>>1);
|
|
else
|
|
return (v>>1);
|
|
}
|
|
|
|
static int get_b(ByteIOContext *bc)
|
|
{
|
|
int i, len, val;
|
|
|
|
len = get_v(bc);
|
|
val = 0;
|
|
for (i = 0; i < len; i++) {
|
|
if (i < 4)
|
|
val |= get_byte(bc) << (i * 8);
|
|
}
|
|
return val;
|
|
}
|
|
|
|
static int get_packetheader(NUTContext *nut, ByteIOContext *bc)
|
|
{
|
|
nut->curr_frame_start = url_ftell(bc);
|
|
nut->curr_frame_size = get_v(bc);
|
|
nut->last_frame_size = get_v(bc);
|
|
dprintf("Packet: fwd: %d bwd: %d\n",
|
|
nut->curr_frame_size, nut->last_frame_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
*
|
|
*/
|
|
static int get_length(uint64_t val){
|
|
int i;
|
|
|
|
for (i=7; ; i+=7)
|
|
if ((val>>i) == 0)
|
|
return i;
|
|
|
|
return 7; //not reached
|
|
}
|
|
|
|
static int put_v(ByteIOContext *bc, uint64_t val)
|
|
{
|
|
int i;
|
|
|
|
// if (bytes_left(s)*8 < 9)
|
|
// return -1;
|
|
|
|
if (bytes_left(bc) < 1)
|
|
return -1;
|
|
|
|
val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
|
|
i= get_length(val);
|
|
|
|
for (i-=7; i>0; i-=7){
|
|
put_byte(bc, 0x80 | (val>>i));
|
|
}
|
|
|
|
put_byte(bc, val&0x7f);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_s(ByteIOContext *bc, uint64_t val)
|
|
{
|
|
if (val<=0)
|
|
return put_v(bc, -2*val);
|
|
else
|
|
return put_v(bc, 2*val-1);
|
|
}
|
|
|
|
static int put_b(ByteIOContext *bc, char *data, int len)
|
|
{
|
|
int i;
|
|
|
|
put_v(bc, len);
|
|
for (i = 0; i < len; i++)
|
|
put_byte(bc, data[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_bi(ByteIOContext *bc, int val)
|
|
{
|
|
put_v(bc, 4);
|
|
put_le32(bc, val);
|
|
return 0;
|
|
}
|
|
|
|
static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size)
|
|
{
|
|
put_flush_packet(bc);
|
|
nut->curr_frame_start = url_ftell(bc);
|
|
nut->curr_frame_size = max_size;
|
|
|
|
/* packet header */
|
|
put_v(bc, nut->curr_frame_size); /* forward ptr */
|
|
put_v(bc, nut->last_frame_size); /* backward ptr */
|
|
dprintf("Packet: fwd: %d, bwd: %d\n",
|
|
nut->curr_frame_size, nut->last_frame_size);
|
|
|
|
nut->last_frame_size = nut->curr_frame_size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size){
|
|
offset_t start= nut->curr_frame_start;
|
|
offset_t cur= url_ftell(bc);
|
|
int size= cur - start + additional_size;
|
|
|
|
assert( size <= nut->curr_frame_size );
|
|
|
|
url_fseek(bc, start, SEEK_SET);
|
|
put_v(bc, size);
|
|
if(get_length(size) < get_length(nut->curr_frame_size))
|
|
put_byte(bc, 0x80);
|
|
nut->curr_frame_size= size;
|
|
dprintf("Packet update: size: %d\n", size);
|
|
|
|
url_fseek(bc, cur, SEEK_SET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nut_write_header(AVFormatContext *s)
|
|
{
|
|
NUTContext *nut = s->priv_data;
|
|
ByteIOContext *bc = &s->pb;
|
|
AVCodecContext *codec;
|
|
int i;
|
|
int stream_length = 0;
|
|
|
|
for (i = 0; i < s->nb_streams; i++)
|
|
{
|
|
if (stream_length < (s->streams[i]->duration * (AV_TIME_BASE / 1000)))
|
|
stream_length = s->streams[i]->duration * (AV_TIME_BASE / 1000);
|
|
}
|
|
|
|
/* main header */
|
|
put_be64(bc, MAIN_STARTCODE);
|
|
put_packetheader(nut, bc, 120);
|
|
put_v(bc, 0); /* version */
|
|
put_v(bc, s->nb_streams);
|
|
put_v(bc, 0); /* file size */
|
|
put_v(bc, stream_length); /* len in msec */
|
|
put_be32(bc, 0); /* FIXME: checksum */
|
|
|
|
update_packetheader(nut, bc, 0);
|
|
|
|
/* stream headers */
|
|
for (i = 0; i < s->nb_streams; i++)
|
|
{
|
|
codec = &s->streams[i]->codec;
|
|
|
|
put_be64(bc, STREAM_STARTCODE);
|
|
put_packetheader(nut, bc, 120);
|
|
put_v(bc, i /*s->streams[i]->index*/);
|
|
put_v(bc, (codec->codec_type == CODEC_TYPE_AUDIO) ? 32 : 0);
|
|
if (codec->codec_tag)
|
|
put_bi(bc, codec->codec_tag);
|
|
else if (codec->codec_type == CODEC_TYPE_VIDEO)
|
|
{
|
|
int tmp = codec_get_bmp_tag(codec->codec_id);
|
|
put_bi(bc, tmp);
|
|
}
|
|
else if (codec->codec_type == CODEC_TYPE_AUDIO)
|
|
{
|
|
int tmp = codec_get_wav_tag(codec->codec_id);
|
|
put_bi(bc, tmp);
|
|
}
|
|
put_v(bc, codec->bit_rate);
|
|
put_v(bc, 0); /* no language code */
|
|
put_v(bc, codec->frame_rate_base);
|
|
put_v(bc, codec->frame_rate);
|
|
put_v(bc, 0); /* timestamp_shift */
|
|
put_v(bc, 0); /* shuffle type */
|
|
put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
|
|
|
|
put_v(bc, 0); /* no codec specific headers */
|
|
|
|
switch(codec->codec_type)
|
|
{
|
|
case CODEC_TYPE_AUDIO:
|
|
put_v(bc, codec->sample_rate / (double)(codec->frame_rate_base / codec->frame_rate));
|
|
put_v(bc, codec->channels);
|
|
put_be32(bc, 0); /* FIXME: checksum */
|
|
break;
|
|
case CODEC_TYPE_VIDEO:
|
|
put_v(bc, codec->width);
|
|
put_v(bc, codec->height);
|
|
put_v(bc, 0); /* aspected w */
|
|
put_v(bc, 0); /* aspected h */
|
|
put_v(bc, 0); /* csp type -- unknown */
|
|
put_be32(bc, 0); /* FIXME: checksum */
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
update_packetheader(nut, bc, 0);
|
|
}
|
|
|
|
#if 0
|
|
/* info header */
|
|
put_be64(bc, INFO_STARTCODE);
|
|
put_packetheader(nut, bc, 16+strlen(s->author)+strlen(s->title)+
|
|
strlen(s->comment)+strlen(s->copyright));
|
|
if (s->author[0])
|
|
{
|
|
put_v(bc, 5); /* type */
|
|
put_b(bc, s->author, strlen(s->author));
|
|
}
|
|
if (s->title[0])
|
|
{
|
|
put_v(bc, 6); /* type */
|
|
put_b(bc, s->title, strlen(s->title));
|
|
}
|
|
if (s->comment[0])
|
|
{
|
|
put_v(bc, 7); /* type */
|
|
put_b(bc, s->comment, strlen(s->comment));
|
|
}
|
|
if (s->copyright[0])
|
|
{
|
|
put_v(bc, 8); /* type */
|
|
put_b(bc, s->copyright, strlen(s->copyright));
|
|
}
|
|
/* encoder */
|
|
put_v(bc, 9); /* type */
|
|
put_b(bc, LIBAVFORMAT_IDENT "\0", strlen(LIBAVFORMAT_IDENT));
|
|
|
|
put_v(bc, 0); /* eof info */
|
|
|
|
put_be32(bc, 0); /* FIXME: checksum */
|
|
update_packetheader(nut, bc, 0);
|
|
#endif
|
|
|
|
put_flush_packet(bc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nut_write_packet(AVFormatContext *s, int stream_index,
|
|
uint8_t *buf, int size, int force_pts)
|
|
{
|
|
NUTContext *nut = s->priv_data;
|
|
ByteIOContext *bc = &s->pb;
|
|
int key_frame = 0;
|
|
int flags;
|
|
AVCodecContext *enc;
|
|
|
|
if (stream_index > s->nb_streams)
|
|
return 1;
|
|
|
|
enc = &s->streams[stream_index]->codec;
|
|
if (enc->codec_type == CODEC_TYPE_VIDEO)
|
|
key_frame = enc->coded_frame->key_frame;
|
|
|
|
if (key_frame)
|
|
put_be64(bc, KEYFRAME_STARTCODE);
|
|
|
|
flags=0;
|
|
flags<<=2; flags|=1; //priority
|
|
flags<<=1; flags|=0; //checksum
|
|
flags<<=1; flags|=0; //msb_timestamp_flag
|
|
flags<<=2; flags|=1; //subpacket_type
|
|
flags<<=1; flags|=0; //reserved
|
|
|
|
put_byte(bc, flags);
|
|
|
|
put_packetheader(nut, bc, size+20);
|
|
put_v(bc, stream_index);
|
|
put_s(bc, force_pts); /* lsb_timestamp */
|
|
update_packetheader(nut, bc, size);
|
|
|
|
put_buffer(bc, buf, size);
|
|
|
|
put_flush_packet(bc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nut_write_trailer(AVFormatContext *s)
|
|
{
|
|
ByteIOContext *bc = &s->pb;
|
|
#if 0
|
|
int i;
|
|
|
|
/* WRITE INDEX */
|
|
|
|
for (i = 0; s->nb_streams; i++)
|
|
{
|
|
put_be64(bc, INDEX_STARTCODE);
|
|
put_packetheader(nut, bc, 64);
|
|
put_v(bc, s->streams[i]->id);
|
|
put_v(bc, ...);
|
|
put_be32(bc, 0); /* FIXME: checksum */
|
|
update_packetheader(nut, bc, 0);
|
|
}
|
|
#endif
|
|
|
|
put_flush_packet(bc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nut_probe(AVProbeData *p)
|
|
{
|
|
int i;
|
|
uint64_t code;
|
|
|
|
code = 0xff;
|
|
for (i = 0; i < p->buf_size; i++) {
|
|
int c = p->buf[i];
|
|
code = (code << 8) | c;
|
|
code &= 0xFFFFFFFFFFFFFFFFULL;
|
|
if (code == MAIN_STARTCODE)
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
|
|
{
|
|
NUTContext *nut = s->priv_data;
|
|
ByteIOContext *bc = &s->pb;
|
|
uint64_t tmp;
|
|
int cur_stream, nb_streams;
|
|
|
|
/* main header */
|
|
tmp = get_be64(bc);
|
|
if (tmp != MAIN_STARTCODE)
|
|
fprintf(stderr, "damaged? startcode!=1 (%Ld)\n", tmp);
|
|
get_packetheader(nut, bc);
|
|
|
|
tmp = get_v(bc);
|
|
if (tmp != 0)
|
|
fprintf(stderr, "bad version (%Ld)\n", tmp);
|
|
|
|
nb_streams = get_v(bc);
|
|
|
|
s->file_size = get_v(bc);
|
|
s->duration = get_v(bc) / (AV_TIME_BASE / 1000);
|
|
|
|
get_be32(bc); /* checkusm */
|
|
|
|
s->bit_rate = 0;
|
|
|
|
/* stream header */
|
|
for (cur_stream = 0; cur_stream < nb_streams; cur_stream++)
|
|
{
|
|
int class;
|
|
AVStream *st;
|
|
|
|
tmp = get_be64(bc);
|
|
if (tmp != STREAM_STARTCODE)
|
|
fprintf(stderr, "damaged? startcode!=1 (%Ld)\n", tmp);
|
|
get_packetheader(nut, bc);
|
|
st = av_new_stream(s, get_v(bc));
|
|
if (!st)
|
|
return AVERROR_NOMEM;
|
|
class = get_v(bc);
|
|
switch(class)
|
|
{
|
|
case 0:
|
|
st->codec.codec_type = CODEC_TYPE_VIDEO;
|
|
tmp = get_b(bc);
|
|
st->codec.codec_id = codec_get_bmp_id(tmp);
|
|
if (st->codec.codec_id == CODEC_ID_NONE)
|
|
fprintf(stderr, "Unknown codec?!\n");
|
|
break;
|
|
case 32:
|
|
st->codec.codec_type = CODEC_TYPE_AUDIO;
|
|
tmp = get_b(bc);
|
|
st->codec.codec_id = codec_get_wav_id(tmp);
|
|
if (st->codec.codec_id == CODEC_ID_NONE)
|
|
fprintf(stderr, "Unknown codec?!\n");
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Unknown stream class (%d)\n", class);
|
|
return -1;
|
|
}
|
|
s->bit_rate += get_v(bc);
|
|
tmp = get_v(bc); /* language code */
|
|
while(tmp--)
|
|
get_byte(bc);
|
|
st->codec.frame_rate_base = get_v(bc);
|
|
st->codec.frame_rate = get_v(bc);
|
|
get_v(bc); /* FIXME: msb timestamp base */
|
|
get_v(bc); /* shuffle type */
|
|
get_byte(bc); /* flags */
|
|
|
|
get_v(bc); /* FIXME: codec specific data headers */
|
|
|
|
if (class == 0) /* VIDEO */
|
|
{
|
|
st->codec.width = get_v(bc);
|
|
st->codec.height = get_v(bc);
|
|
get_v(bc); /* aspected w */
|
|
get_v(bc); /* aspected h */
|
|
get_v(bc); /* csp type */
|
|
get_le32(bc); /* checksum */
|
|
}
|
|
if (class == 32) /* AUDIO */
|
|
{
|
|
st->codec.sample_rate = get_v(bc) * (double)(st->codec.frame_rate_base / st->codec.frame_rate);
|
|
st->codec.channels = get_v(bc);
|
|
get_le32(bc); /* checksum */
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
NUTContext *nut = s->priv_data;
|
|
ByteIOContext *bc = &s->pb;
|
|
int id, timestamp, size;
|
|
int key_frame = 0;
|
|
uint64_t tmp;
|
|
|
|
|
|
if (url_feof(bc))
|
|
return -1;
|
|
|
|
tmp = get_byte(bc);
|
|
if (tmp & 0x80) /* zero bit set? */
|
|
{
|
|
tmp<<=8 ; tmp |= get_byte(bc);
|
|
tmp<<=16; tmp |= get_be16(bc);
|
|
tmp<<=32; tmp |= get_be32(bc);
|
|
if (tmp == KEYFRAME_STARTCODE)
|
|
{
|
|
key_frame = 1;
|
|
tmp = get_byte(bc); /* flags */
|
|
}
|
|
else
|
|
fprintf(stderr, "error in zero bit / startcode %LX\n", tmp);
|
|
}
|
|
get_packetheader(nut, bc);
|
|
#if 0
|
|
if (((tmp & 0x60)>>5) > 3) /* priority <= 3 */
|
|
fprintf(stderr, "sanity check failed!\n");
|
|
#endif
|
|
id = get_v(bc);
|
|
timestamp = get_s(bc);
|
|
|
|
size = (nut->curr_frame_size - (url_ftell(bc)-nut->curr_frame_start));
|
|
dprintf("flags: 0x%Lx, timestamp: %d, packet size: %d\n", tmp, timestamp, size);
|
|
|
|
if (size < 0)
|
|
return -1;
|
|
|
|
av_new_packet(pkt, size);
|
|
get_buffer(bc, pkt->data, size);
|
|
pkt->stream_index = id;
|
|
if (key_frame)
|
|
pkt->flags |= PKT_FLAG_KEY;
|
|
pkt->pts = timestamp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static AVInputFormat nut_iformat = {
|
|
"nut",
|
|
"nut format",
|
|
sizeof(NUTContext),
|
|
nut_probe,
|
|
nut_read_header,
|
|
nut_read_packet,
|
|
// nut_read_close,
|
|
// nut_read_seek,
|
|
.extensions = "nut",
|
|
};
|
|
|
|
static AVOutputFormat nut_oformat = {
|
|
"nut",
|
|
"nut format",
|
|
"video/x-nut",
|
|
"nut",
|
|
sizeof(NUTContext),
|
|
#ifdef CONFIG_VORBIS
|
|
CODEC_ID_VORBIS,
|
|
#elif defined(CONFIG_MP3LAME)
|
|
CODEC_ID_MP3,
|
|
#else
|
|
CODEC_ID_MP2, /* AC3 needs liba52 decoder */
|
|
#endif
|
|
CODEC_ID_MPEG4,
|
|
nut_write_header,
|
|
nut_write_packet,
|
|
nut_write_trailer,
|
|
};
|
|
|
|
int nut_init(void)
|
|
{
|
|
av_register_input_format(&nut_iformat);
|
|
av_register_output_format(&nut_oformat);
|
|
return 0;
|
|
}
|