mirror of
https://github.com/FFmpeg/FFmpeg.git
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602 lines
14 KiB
C
602 lines
14 KiB
C
/*
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* "NUT" Container Format muxer and demuxer (DRAFT-20031003)
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* Copyright (c) 2003 Alex Beregszaszi
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* NUT DRAFT can be found in MPlayer CVS at DOCS/tech/mpcf.txt
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*
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* AND http://people.fsn.hu/~alex/nut/ (TeX, pdf, ps, dvi, ..)
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*
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*/
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/*
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* TODO:
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* - checksumming
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* - optimal timestamp handling
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* - index writing
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* - info and index packet reading support
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* - startcode searching for broken streams
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* - subpacket support
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*/
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//#define DEBUG 1
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#include "avformat.h"
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#include "mpegaudio.h"
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#include "avi.h"
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//from /dev/random
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#define MAIN_STARTCODE (0xF9526A6200000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'M')
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#define STREAM_STARTCODE (0xD667773F00000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'S')
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#define KEYFRAME_STARTCODE (0xCB86308700000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'K')
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#define INDEX_STARTCODE (0xEBFCDE0E00000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'X')
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#define INFO_STARTCODE (0xA37B643500000000ULL + ('N'<<24) + ('U'<<16) + ('T'<<8) + 'I')
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typedef struct {
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int curr_frame_start;
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int last_frame_size;
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int curr_frame_size;
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} NUTContext;
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static int bytes_left(ByteIOContext *bc)
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{
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return bc->buf_end - bc->buf_ptr;
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}
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static uint64_t get_v(ByteIOContext *bc)
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{
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uint64_t val = 0;
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for(; bytes_left(bc) > 0; )
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{
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int tmp = get_byte(bc);
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if (tmp&0x80)
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val= (val<<7) + tmp - 0x80;
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else
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return (val<<7) + tmp;
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}
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return -1;
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}
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static int64_t get_s(ByteIOContext *bc)
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{
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int64_t v = get_v(bc) + 1;
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if (v&1)
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return -(v>>1);
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else
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return (v>>1);
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}
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static int get_b(ByteIOContext *bc, char *data, int maxlen)
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{
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int i, len;
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len = get_v(bc);
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for (i = 0; i < len && i < maxlen; i++)
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data[i] = get_byte(bc);
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/* skip remaining bytes */
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url_fskip(bc, len-i);
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return 0;
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}
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static int get_bi(ByteIOContext *bc)
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{
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int i, len, val = 0;
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len = get_v(bc);
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for (i = 0; i < len && i <= 4; i++)
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val |= get_byte(bc) << (i * 8);
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/* skip remaining bytes */
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url_fskip(bc, len-i);
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return val;
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}
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static int get_packetheader(NUTContext *nut, ByteIOContext *bc)
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{
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nut->curr_frame_start = url_ftell(bc);
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nut->curr_frame_size = get_v(bc);
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nut->last_frame_size = get_v(bc);
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dprintf("Packet: fwd: %d bwd: %d\n",
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nut->curr_frame_size, nut->last_frame_size);
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return 0;
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}
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/**
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*
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*/
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static int get_length(uint64_t val){
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int i;
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for (i=7; ; i+=7)
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if ((val>>i) == 0)
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return i;
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return 7; //not reached
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}
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#ifdef CONFIG_ENCODERS
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static int put_v(ByteIOContext *bc, uint64_t val)
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{
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int i;
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// if (bytes_left(s)*8 < 9)
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// return -1;
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if (bytes_left(bc) < 1)
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return -1;
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val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
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i= get_length(val);
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for (i-=7; i>0; i-=7){
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put_byte(bc, 0x80 | (val>>i));
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}
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put_byte(bc, val&0x7f);
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return 0;
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}
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static int put_s(ByteIOContext *bc, uint64_t val)
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{
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if (val<=0)
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return put_v(bc, -2*val);
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else
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return put_v(bc, 2*val-1);
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}
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static int put_b(ByteIOContext *bc, char *data, int len)
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{
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int i;
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put_v(bc, len);
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for (i = 0; i < len; i++)
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put_byte(bc, data[i]);
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return 0;
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}
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static int put_bi(ByteIOContext *bc, int val)
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{
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put_v(bc, 4);
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put_le32(bc, val);
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return 0;
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}
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static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size)
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{
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put_flush_packet(bc);
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nut->curr_frame_start = url_ftell(bc);
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nut->curr_frame_size = max_size;
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/* packet header */
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put_v(bc, nut->curr_frame_size); /* forward ptr */
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put_v(bc, nut->last_frame_size); /* backward ptr */
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dprintf("Packet: fwd: %d, bwd: %d\n",
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nut->curr_frame_size, nut->last_frame_size);
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nut->last_frame_size = nut->curr_frame_size;
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return 0;
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}
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static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size){
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offset_t start= nut->curr_frame_start;
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offset_t cur= url_ftell(bc);
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int size= cur - start + additional_size;
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assert( size <= nut->curr_frame_size );
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url_fseek(bc, start, SEEK_SET);
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put_v(bc, size);
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if(get_length(size) < get_length(nut->curr_frame_size))
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put_byte(bc, 0x80);
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nut->curr_frame_size= size;
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dprintf("Packet update: size: %d\n", size);
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url_fseek(bc, cur, SEEK_SET);
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return 0;
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}
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static int nut_write_header(AVFormatContext *s)
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{
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NUTContext *nut = s->priv_data;
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ByteIOContext *bc = &s->pb;
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AVCodecContext *codec;
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int i;
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/* main header */
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put_be64(bc, MAIN_STARTCODE);
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put_packetheader(nut, bc, 120);
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put_v(bc, 0); /* version */
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put_v(bc, s->nb_streams);
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put_be32(bc, 0); /* FIXME: checksum */
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update_packetheader(nut, bc, 0);
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/* stream headers */
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for (i = 0; i < s->nb_streams; i++)
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{
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int nom, denom;
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codec = &s->streams[i]->codec;
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put_be64(bc, STREAM_STARTCODE);
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put_packetheader(nut, bc, 120);
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put_v(bc, i /*s->streams[i]->index*/);
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put_v(bc, (codec->codec_type == CODEC_TYPE_AUDIO) ? 32 : 0);
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if (codec->codec_tag)
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put_bi(bc, codec->codec_tag);
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else if (codec->codec_type == CODEC_TYPE_VIDEO)
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{
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int tmp = codec_get_bmp_tag(codec->codec_id);
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put_bi(bc, tmp);
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}
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else if (codec->codec_type == CODEC_TYPE_AUDIO)
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{
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int tmp = codec_get_wav_tag(codec->codec_id);
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put_bi(bc, tmp);
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}
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if (codec->codec_type == CODEC_TYPE_VIDEO)
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{
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nom = codec->frame_rate;
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denom = codec->frame_rate_base;
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}
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else
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{
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nom = codec->sample_rate/8;
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denom = 8;
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}
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put_v(bc, codec->bit_rate);
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put_v(bc, 0); /* no language code */
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put_v(bc, nom);
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put_v(bc, denom);
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put_v(bc, 0); /* msb timestamp_shift */
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put_v(bc, 0); /* shuffle type */
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put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
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put_v(bc, 0); /* no codec specific headers */
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switch(codec->codec_type)
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{
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case CODEC_TYPE_AUDIO:
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put_v(bc, (codec->sample_rate * denom) / nom);
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put_v(bc, codec->channels);
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put_be32(bc, 0); /* FIXME: checksum */
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break;
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case CODEC_TYPE_VIDEO:
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put_v(bc, codec->width);
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put_v(bc, codec->height);
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put_v(bc, 0); /* aspected w */
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put_v(bc, 0); /* aspected h */
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put_v(bc, 0); /* csp type -- unknown */
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put_be32(bc, 0); /* FIXME: checksum */
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break;
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default:
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break;
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}
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update_packetheader(nut, bc, 0);
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}
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#if 0
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/* info header */
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put_be64(bc, INFO_STARTCODE);
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put_packetheader(nut, bc, 16+strlen(s->author)+strlen(s->title)+
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strlen(s->comment)+strlen(s->copyright));
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if (s->author[0])
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{
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put_v(bc, 5); /* type */
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put_b(bc, s->author, strlen(s->author));
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}
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if (s->title[0])
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{
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put_v(bc, 6); /* type */
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put_b(bc, s->title, strlen(s->title));
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}
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if (s->comment[0])
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{
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put_v(bc, 7); /* type */
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put_b(bc, s->comment, strlen(s->comment));
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}
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if (s->copyright[0])
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{
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put_v(bc, 8); /* type */
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put_b(bc, s->copyright, strlen(s->copyright));
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}
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/* encoder */
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put_v(bc, 9); /* type */
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put_b(bc, LIBAVFORMAT_IDENT "\0", strlen(LIBAVFORMAT_IDENT));
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put_v(bc, 0); /* eof info */
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put_be32(bc, 0); /* FIXME: checksum */
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update_packetheader(nut, bc, 0);
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#endif
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put_flush_packet(bc);
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return 0;
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}
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static int nut_write_packet(AVFormatContext *s, int stream_index,
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const uint8_t *buf, int size, int64_t pts)
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{
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NUTContext *nut = s->priv_data;
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ByteIOContext *bc = &s->pb;
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int key_frame = 0;
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int flags;
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AVCodecContext *enc;
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if (stream_index > s->nb_streams)
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return 1;
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enc = &s->streams[stream_index]->codec;
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key_frame = enc->coded_frame->key_frame;
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if (key_frame)
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put_be64(bc, KEYFRAME_STARTCODE);
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flags=0;
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flags<<=2; flags|=1; //priority
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flags<<=1; flags|=0; //checksum
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flags<<=1; flags|=0; //msb_timestamp_flag
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flags<<=2; flags|=1; //subpacket_type
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flags<<=1; flags|=0; //reserved
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put_byte(bc, flags);
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put_packetheader(nut, bc, size+20);
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put_v(bc, stream_index);
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put_s(bc, pts); /* lsb_timestamp */
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update_packetheader(nut, bc, size);
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put_buffer(bc, buf, size);
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put_flush_packet(bc);
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return 0;
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}
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static int nut_write_trailer(AVFormatContext *s)
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{
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ByteIOContext *bc = &s->pb;
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#if 0
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int i;
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/* WRITE INDEX */
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for (i = 0; s->nb_streams; i++)
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{
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put_be64(bc, INDEX_STARTCODE);
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put_packetheader(nut, bc, 64);
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put_v(bc, s->streams[i]->id);
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put_v(bc, ...);
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put_be32(bc, 0); /* FIXME: checksum */
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update_packetheader(nut, bc, 0);
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}
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#endif
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put_flush_packet(bc);
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return 0;
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}
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#endif //CONFIG_ENCODERS
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static int nut_probe(AVProbeData *p)
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{
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int i;
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uint64_t code;
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code = 0xff;
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for (i = 0; i < p->buf_size; i++) {
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int c = p->buf[i];
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code = (code << 8) | c;
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if (code == MAIN_STARTCODE)
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return AVPROBE_SCORE_MAX;
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}
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return 0;
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}
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static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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NUTContext *nut = s->priv_data;
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ByteIOContext *bc = &s->pb;
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uint64_t tmp;
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int cur_stream, nb_streams;
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/* main header */
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tmp = get_be64(bc);
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if (tmp != MAIN_STARTCODE)
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fprintf(stderr, "damaged? startcode!=1 (%Ld)\n", tmp);
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get_packetheader(nut, bc);
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tmp = get_v(bc);
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if (tmp != 0)
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fprintf(stderr, "bad version (%Ld)\n", tmp);
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nb_streams = get_v(bc);
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get_be32(bc); /* checkusm */
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s->bit_rate = 0;
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/* stream header */
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for (cur_stream = 0; cur_stream < nb_streams; cur_stream++)
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{
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int class, nom, denom;
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AVStream *st;
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tmp = get_be64(bc);
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if (tmp != STREAM_STARTCODE)
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fprintf(stderr, "damaged? startcode!=1 (%Ld)\n", tmp);
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get_packetheader(nut, bc);
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st = av_new_stream(s, get_v(bc));
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if (!st)
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return AVERROR_NOMEM;
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class = get_v(bc);
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tmp = get_bi(bc);
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switch(class)
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{
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case 0:
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st->codec.codec_type = CODEC_TYPE_VIDEO;
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st->codec.codec_id = codec_get_bmp_id(tmp);
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if (st->codec.codec_id == CODEC_ID_NONE)
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fprintf(stderr, "Unknown codec?!\n");
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break;
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case 32:
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st->codec.codec_type = CODEC_TYPE_AUDIO;
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st->codec.codec_id = codec_get_wav_id(tmp);
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if (st->codec.codec_id == CODEC_ID_NONE)
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fprintf(stderr, "Unknown codec?!\n");
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break;
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default:
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fprintf(stderr, "Unknown stream class (%d)\n", class);
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return -1;
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}
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s->bit_rate += get_v(bc);
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get_b(bc, NULL, 0); /* language code */
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nom = get_v(bc);
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denom = get_v(bc);
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get_v(bc); /* FIXME: msb timestamp base */
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get_v(bc); /* shuffle type */
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get_byte(bc); /* flags */
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/* codec specific data headers */
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while(get_v(bc) != 0)
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url_fskip(bc, get_v(bc));
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if (class == 0) /* VIDEO */
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{
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st->codec.width = get_v(bc);
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st->codec.height = get_v(bc);
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get_v(bc); /* aspected w */
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get_v(bc); /* aspected h */
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get_v(bc); /* csp type */
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get_be32(bc); /* checksum */
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st->codec.frame_rate = nom;
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st->codec.frame_rate_base = denom;
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}
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if (class == 32) /* AUDIO */
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{
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st->codec.sample_rate = (get_v(bc) * nom) / denom;
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st->codec.channels = get_v(bc);
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get_be32(bc); /* checksum */
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}
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}
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return 0;
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}
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static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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NUTContext *nut = s->priv_data;
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ByteIOContext *bc = &s->pb;
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int id, timestamp, size;
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int key_frame = 0;
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uint64_t tmp;
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if (url_feof(bc))
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return -1;
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tmp = get_byte(bc);
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if (tmp & 0x80) /* zero bit set? */
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{
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tmp<<=8 ; tmp |= get_byte(bc);
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tmp<<=16; tmp |= get_be16(bc);
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tmp<<=32; tmp |= get_be32(bc);
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if (tmp == KEYFRAME_STARTCODE)
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{
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key_frame = 1;
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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",
|
|
};
|
|
|
|
#ifdef CONFIG_ENCODERS
|
|
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,
|
|
};
|
|
#endif //CONFIG_ENCODERS
|
|
|
|
int nut_init(void)
|
|
{
|
|
av_register_input_format(&nut_iformat);
|
|
#ifdef CONFIG_ENCODERS
|
|
av_register_output_format(&nut_oformat);
|
|
#endif //CONFIG_ENCODERS
|
|
return 0;
|
|
}
|