ffmpeg / libavformat / nutdec.c @ 93951943
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/*
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* "NUT" Container Format demuxer
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* Copyright (c) 2004-2006 Michael Niedermayer
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* Copyright (c) 2003 Alex Beregszaszi
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "tree.h" |
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#include "nut.h" |
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#include "avstring.h" |
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#undef NDEBUG
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#include <assert.h> |
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static uint64_t get_v(ByteIOContext *bc){
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uint64_t val = 0;
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int tmp;
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|
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do{
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tmp = get_byte(bc); |
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val= (val<<7) + (tmp&127); |
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}while(tmp&128); |
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return val;
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} |
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|
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static int get_str(ByteIOContext *bc, char *string, unsigned int maxlen){ |
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unsigned int len= get_v(bc); |
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|
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if(len && maxlen)
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get_buffer(bc, string, FFMIN(len, maxlen)); |
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while(len > maxlen){
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get_byte(bc); |
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len--; |
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} |
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|
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if(maxlen)
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string[FFMIN(len, maxlen-1)]= 0; |
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|
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if(maxlen == len)
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return -1; |
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else
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return 0; |
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} |
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|
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static int64_t get_s(ByteIOContext *bc){
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int64_t v = get_v(bc) + 1;
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|
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if (v&1) return -(v>>1); |
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else return (v>>1); |
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} |
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|
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static uint64_t get_fourcc(ByteIOContext *bc){
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unsigned int len= get_v(bc); |
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|
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if (len==2) return get_le16(bc); |
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else if(len==4) return get_le32(bc); |
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else return -1; |
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} |
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|
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#ifdef TRACE
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static inline uint64_t get_v_trace(ByteIOContext *bc, char *file, char *func, int line){ |
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uint64_t v= get_v(bc); |
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|
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av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); |
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return v;
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} |
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|
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static inline int64_t get_s_trace(ByteIOContext *bc, char *file, char *func, int line){ |
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int64_t v= get_s(bc); |
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|
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av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); |
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return v;
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} |
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|
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static inline uint64_t get_vb_trace(ByteIOContext *bc, char *file, char *func, int line){ |
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uint64_t v= get_vb(bc); |
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|
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av_log(NULL, AV_LOG_DEBUG, "get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); |
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return v;
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} |
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#define get_v(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
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#define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
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#define get_vb(bc) get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
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#endif
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|
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static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum, uint64_t startcode) |
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{
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int64_t size; |
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// start= url_ftell(bc) - 8;
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startcode= be2me_64(startcode); |
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startcode= av_crc04C11DB7_update(0, &startcode, 8); |
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init_checksum(bc, av_crc04C11DB7_update, startcode); |
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size= get_v(bc); |
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if(size > 4096) |
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get_be32(bc); |
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if(get_checksum(bc) && size > 4096) |
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return -1; |
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|
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init_checksum(bc, calculate_checksum ? av_crc04C11DB7_update : NULL, 0); |
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return size;
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} |
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static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
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uint64_t state=0;
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if(pos >= 0) |
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url_fseek(bc, pos, SEEK_SET); //note, this may fail if the stream is not seekable, but that should not matter, as in this case we simply start where we are currently
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while(!url_feof(bc)){
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state= (state<<8) | get_byte(bc);
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if((state>>56) != 'N') |
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continue;
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switch(state){
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case MAIN_STARTCODE:
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case STREAM_STARTCODE:
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case SYNCPOINT_STARTCODE:
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case INFO_STARTCODE:
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case INDEX_STARTCODE:
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return state;
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} |
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} |
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return 0; |
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} |
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/**
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* Find the given startcode.
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* @param code the startcode
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* @param pos the start position of the search, or -1 if the current position
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* @returns the position of the startcode or -1 if not found
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*/
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static int64_t find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
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for(;;){
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uint64_t startcode= find_any_startcode(bc, pos); |
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if(startcode == code)
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return url_ftell(bc) - 8; |
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else if(startcode == 0) |
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return -1; |
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pos=-1;
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} |
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} |
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static int nut_probe(AVProbeData *p){ |
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int i;
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uint64_t code= 0;
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for (i = 0; i < p->buf_size; i++) { |
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code = (code << 8) | p->buf[i];
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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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#define GET_V(dst, check) \
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tmp= get_v(bc);\ |
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if(!(check)){\
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av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp);\ |
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return -1;\ |
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}\ |
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dst= tmp; |
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|
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static int skip_reserved(ByteIOContext *bc, int64_t pos){ |
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pos -= url_ftell(bc); |
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if(pos<0){ |
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url_fseek(bc, pos, SEEK_CUR); |
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return -1; |
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}else{
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while(pos--)
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get_byte(bc); |
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return 0; |
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} |
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} |
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static int decode_main_header(NUTContext *nut){ |
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AVFormatContext *s= nut->avf; |
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ByteIOContext *bc = &s->pb; |
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uint64_t tmp, end; |
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unsigned int stream_count; |
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int i, j, tmp_stream, tmp_mul, tmp_pts, tmp_size, count, tmp_res;
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end= get_packetheader(nut, bc, 1, MAIN_STARTCODE);
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end += url_ftell(bc); |
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GET_V(tmp , tmp >=2 && tmp <= 3) |
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GET_V(stream_count , tmp > 0 && tmp <=MAX_STREAMS)
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nut->max_distance = get_v(bc); |
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if(nut->max_distance > 65536){ |
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av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
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nut->max_distance= 65536;
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} |
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|
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GET_V(nut->time_base_count, tmp>0 && tmp<INT_MAX / sizeof(AVRational)) |
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nut->time_base= av_malloc(nut->time_base_count * sizeof(AVRational));
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|
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for(i=0; i<nut->time_base_count; i++){ |
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GET_V(nut->time_base[i].num, tmp>0 && tmp<(1ULL<<31)) |
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GET_V(nut->time_base[i].den, tmp>0 && tmp<(1ULL<<31)) |
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if(ff_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1){ |
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av_log(s, AV_LOG_ERROR, "time base invalid\n");
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return -1; |
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} |
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} |
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tmp_pts=0;
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tmp_mul=1;
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tmp_stream=0;
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for(i=0; i<256;){ |
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int tmp_flags = get_v(bc);
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int tmp_fields= get_v(bc);
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if(tmp_fields>0) tmp_pts = get_s(bc); |
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if(tmp_fields>1) tmp_mul = get_v(bc); |
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if(tmp_fields>2) tmp_stream= get_v(bc); |
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if(tmp_fields>3) tmp_size = get_v(bc); |
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else tmp_size = 0; |
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if(tmp_fields>4) tmp_res = get_v(bc); |
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else tmp_res = 0; |
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if(tmp_fields>5) count = get_v(bc); |
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else count = tmp_mul - tmp_size;
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|
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while(tmp_fields-- > 6) |
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get_v(bc); |
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|
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if(count == 0 || i+count > 256){ |
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av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
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return -1; |
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} |
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if(tmp_stream >= stream_count){
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av_log(s, AV_LOG_ERROR, "illegal stream number\n");
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return -1; |
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} |
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|
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for(j=0; j<count; j++,i++){ |
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if (i == 'N') { |
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nut->frame_code[i].flags= FLAG_INVALID; |
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j--; |
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continue;
|
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} |
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nut->frame_code[i].flags = tmp_flags ; |
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nut->frame_code[i].pts_delta = tmp_pts ; |
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nut->frame_code[i].stream_id = tmp_stream; |
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nut->frame_code[i].size_mul = tmp_mul ; |
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nut->frame_code[i].size_lsb = tmp_size+j; |
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nut->frame_code[i].reserved_count = tmp_res ; |
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} |
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} |
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assert(nut->frame_code['N'].flags == FLAG_INVALID);
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|
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if(skip_reserved(bc, end) || get_checksum(bc)){
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av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
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return -1; |
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} |
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|
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nut->stream = av_mallocz(sizeof(StreamContext)*stream_count);
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for(i=0; i<stream_count; i++){ |
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av_new_stream(s, i); |
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} |
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return 0; |
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} |
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|
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static int decode_stream_header(NUTContext *nut){ |
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AVFormatContext *s= nut->avf; |
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ByteIOContext *bc = &s->pb; |
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StreamContext *stc; |
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int class, stream_id;
|
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uint64_t tmp, end; |
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AVStream *st; |
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|
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end= get_packetheader(nut, bc, 1, STREAM_STARTCODE);
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end += url_ftell(bc); |
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|
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GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base); |
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stc= &nut->stream[stream_id]; |
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|
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st = s->streams[stream_id]; |
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if (!st)
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return AVERROR(ENOMEM);
|
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|
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class = get_v(bc); |
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tmp = get_fourcc(bc); |
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st->codec->codec_tag= tmp; |
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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_id(codec_bmp_tags, tmp); |
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if (st->codec->codec_id == CODEC_ID_NONE)
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av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
|
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break;
|
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case 1: |
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st->codec->codec_type = CODEC_TYPE_AUDIO; |
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st->codec->codec_id = codec_get_id(codec_wav_tags, tmp); |
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if (st->codec->codec_id == CODEC_ID_NONE)
|
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av_log(s, AV_LOG_ERROR, "Unknown codec?!\n");
|
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break;
|
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case 2: |
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// st->codec->codec_type = CODEC_TYPE_TEXT;
|
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// break;
|
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case 3: |
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st->codec->codec_type = CODEC_TYPE_DATA; |
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break;
|
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default:
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av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
|
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return -1; |
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} |
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GET_V(stc->time_base_id , tmp < nut->time_base_count); |
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GET_V(stc->msb_pts_shift , tmp < 16);
|
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stc->max_pts_distance= get_v(bc); |
| 328 |
GET_V(stc->decode_delay , tmp < 1000); //sanity limit, raise this if Moore's law is true |
| 329 |
st->codec->has_b_frames= stc->decode_delay; |
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get_v(bc); //stream flags
|
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|
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GET_V(st->codec->extradata_size, tmp < (1<<30)); |
| 333 |
if(st->codec->extradata_size){
|
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st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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get_buffer(bc, st->codec->extradata, st->codec->extradata_size); |
| 336 |
} |
| 337 |
|
| 338 |
if (st->codec->codec_type == CODEC_TYPE_VIDEO){
|
| 339 |
GET_V(st->codec->width , tmp > 0)
|
| 340 |
GET_V(st->codec->height, tmp > 0)
|
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st->codec->sample_aspect_ratio.num= get_v(bc); |
| 342 |
st->codec->sample_aspect_ratio.den= get_v(bc); |
| 343 |
if((!st->codec->sample_aspect_ratio.num) != (!st->codec->sample_aspect_ratio.den)){
|
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av_log(s, AV_LOG_ERROR, "invalid aspect ratio\n");
|
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return -1; |
| 346 |
} |
| 347 |
get_v(bc); /* csp type */
|
| 348 |
}else if (st->codec->codec_type == CODEC_TYPE_AUDIO){ |
| 349 |
GET_V(st->codec->sample_rate , tmp > 0)
|
| 350 |
tmp= get_v(bc); // samplerate_den
|
| 351 |
if(tmp > st->codec->sample_rate){
|
| 352 |
av_log(s, AV_LOG_ERROR, "Bleh, libnut muxed this ;)\n");
|
| 353 |
st->codec->sample_rate= tmp; |
| 354 |
} |
| 355 |
GET_V(st->codec->channels, tmp > 0)
|
| 356 |
} |
| 357 |
if(skip_reserved(bc, end) || get_checksum(bc)){
|
| 358 |
av_log(s, AV_LOG_ERROR, "stream header %d checksum mismatch\n", stream_id);
|
| 359 |
return -1; |
| 360 |
} |
| 361 |
stc->time_base= &nut->time_base[stc->time_base_id]; |
| 362 |
av_set_pts_info(s->streams[stream_id], 63, stc->time_base->num, stc->time_base->den);
|
| 363 |
return 0; |
| 364 |
} |
| 365 |
|
| 366 |
static int decode_info_header(NUTContext *nut){ |
| 367 |
AVFormatContext *s= nut->avf; |
| 368 |
ByteIOContext *bc = &s->pb; |
| 369 |
uint64_t tmp; |
| 370 |
unsigned int stream_id_plus1, chapter_start, chapter_len, count; |
| 371 |
int chapter_id, i;
|
| 372 |
int64_t value, end; |
| 373 |
char name[256], str_value[1024], type_str[256], *type= type_str; |
| 374 |
|
| 375 |
end= get_packetheader(nut, bc, 1, INFO_STARTCODE);
|
| 376 |
end += url_ftell(bc); |
| 377 |
|
| 378 |
GET_V(stream_id_plus1, tmp <= s->nb_streams) |
| 379 |
chapter_id = get_s(bc); |
| 380 |
chapter_start= get_v(bc); |
| 381 |
chapter_len = get_v(bc); |
| 382 |
count = get_v(bc); |
| 383 |
for(i=0; i<count; i++){ |
| 384 |
get_str(bc, name, sizeof(name));
|
| 385 |
value= get_s(bc); |
| 386 |
if(value == -1){ |
| 387 |
type= "UTF-8";
|
| 388 |
get_str(bc, str_value, sizeof(str_value));
|
| 389 |
}else if(value == -2){ |
| 390 |
get_str(bc, type, sizeof(type));
|
| 391 |
get_str(bc, str_value, sizeof(str_value));
|
| 392 |
}else if(value == -3){ |
| 393 |
type= "s";
|
| 394 |
value= get_s(bc); |
| 395 |
}else if(value == -4){ |
| 396 |
type= "t";
|
| 397 |
value= get_v(bc); |
| 398 |
}else if(value < -4){ |
| 399 |
type= "r";
|
| 400 |
get_s(bc); |
| 401 |
}else{
|
| 402 |
type= "v";
|
| 403 |
} |
| 404 |
|
| 405 |
if(chapter_id==0 && !strcmp(type, "UTF-8")){ |
| 406 |
if (!strcmp(name, "Author")) |
| 407 |
av_strlcpy(s->author , str_value, sizeof(s->author));
|
| 408 |
else if(!strcmp(name, "Title")) |
| 409 |
av_strlcpy(s->title , str_value, sizeof(s->title));
|
| 410 |
else if(!strcmp(name, "Copyright")) |
| 411 |
av_strlcpy(s->copyright, str_value, sizeof(s->copyright));
|
| 412 |
else if(!strcmp(name, "Description")) |
| 413 |
av_strlcpy(s->comment , str_value, sizeof(s->comment));
|
| 414 |
} |
| 415 |
} |
| 416 |
|
| 417 |
if(skip_reserved(bc, end) || get_checksum(bc)){
|
| 418 |
av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
|
| 419 |
return -1; |
| 420 |
} |
| 421 |
return 0; |
| 422 |
} |
| 423 |
|
| 424 |
static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr){ |
| 425 |
AVFormatContext *s= nut->avf; |
| 426 |
ByteIOContext *bc = &s->pb; |
| 427 |
int64_t end, tmp; |
| 428 |
AVRational time_base; |
| 429 |
|
| 430 |
nut->last_syncpoint_pos= url_ftell(bc)-8;
|
| 431 |
|
| 432 |
end= get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
|
| 433 |
end += url_ftell(bc); |
| 434 |
|
| 435 |
tmp= get_v(bc); |
| 436 |
*back_ptr= nut->last_syncpoint_pos - 16*get_v(bc);
|
| 437 |
if(*back_ptr < 0) |
| 438 |
return -1; |
| 439 |
|
| 440 |
ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count], tmp); |
| 441 |
|
| 442 |
if(skip_reserved(bc, end) || get_checksum(bc)){
|
| 443 |
av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
|
| 444 |
return -1; |
| 445 |
} |
| 446 |
|
| 447 |
*ts= tmp / s->nb_streams * av_q2d(nut->time_base[tmp % s->nb_streams])*AV_TIME_BASE; |
| 448 |
ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts); |
| 449 |
|
| 450 |
return 0; |
| 451 |
} |
| 452 |
|
| 453 |
static int find_and_decode_index(NUTContext *nut){ |
| 454 |
AVFormatContext *s= nut->avf; |
| 455 |
ByteIOContext *bc = &s->pb; |
| 456 |
uint64_t tmp, end; |
| 457 |
int i, j, syncpoint_count;
|
| 458 |
int64_t filesize= url_fsize(bc); |
| 459 |
int64_t *syncpoints; |
| 460 |
int8_t *has_keyframe; |
| 461 |
|
| 462 |
url_fseek(bc, filesize-12, SEEK_SET);
|
| 463 |
url_fseek(bc, filesize-get_be64(bc), SEEK_SET); |
| 464 |
if(get_be64(bc) != INDEX_STARTCODE){
|
| 465 |
av_log(s, AV_LOG_ERROR, "no index at the end\n");
|
| 466 |
return -1; |
| 467 |
} |
| 468 |
|
| 469 |
end= get_packetheader(nut, bc, 1, INDEX_STARTCODE);
|
| 470 |
end += url_ftell(bc); |
| 471 |
|
| 472 |
get_v(bc); //max_pts
|
| 473 |
GET_V(syncpoint_count, tmp < INT_MAX/8 && tmp > 0) |
| 474 |
syncpoints= av_malloc(sizeof(int64_t)*syncpoint_count);
|
| 475 |
has_keyframe= av_malloc(sizeof(int8_t)*(syncpoint_count+1)); |
| 476 |
for(i=0; i<syncpoint_count; i++){ |
| 477 |
GET_V(syncpoints[i], tmp>0)
|
| 478 |
if(i)
|
| 479 |
syncpoints[i] += syncpoints[i-1];
|
| 480 |
} |
| 481 |
|
| 482 |
for(i=0; i<s->nb_streams; i++){ |
| 483 |
int64_t last_pts= -1;
|
| 484 |
for(j=0; j<syncpoint_count;){ |
| 485 |
uint64_t x= get_v(bc); |
| 486 |
int type= x&1; |
| 487 |
int n= j;
|
| 488 |
x>>=1;
|
| 489 |
if(type){
|
| 490 |
int flag= x&1; |
| 491 |
x>>=1;
|
| 492 |
if(n+x >= syncpoint_count + 1){ |
| 493 |
av_log(s, AV_LOG_ERROR, "index overflow A\n");
|
| 494 |
return -1; |
| 495 |
} |
| 496 |
while(x--)
|
| 497 |
has_keyframe[n++]= flag; |
| 498 |
has_keyframe[n++]= !flag; |
| 499 |
}else{
|
| 500 |
while(x != 1){ |
| 501 |
if(n>=syncpoint_count + 1){ |
| 502 |
av_log(s, AV_LOG_ERROR, "index overflow B\n");
|
| 503 |
return -1; |
| 504 |
} |
| 505 |
has_keyframe[n++]= x&1;
|
| 506 |
x>>=1;
|
| 507 |
} |
| 508 |
} |
| 509 |
if(has_keyframe[0]){ |
| 510 |
av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
|
| 511 |
return -1; |
| 512 |
} |
| 513 |
assert(n<=syncpoint_count+1);
|
| 514 |
for(; j<n; j++){
|
| 515 |
if(has_keyframe[j]){
|
| 516 |
uint64_t B, A= get_v(bc); |
| 517 |
if(!A){
|
| 518 |
A= get_v(bc); |
| 519 |
B= get_v(bc); |
| 520 |
//eor_pts[j][i] = last_pts + A + B
|
| 521 |
}else
|
| 522 |
B= 0;
|
| 523 |
av_add_index_entry( |
| 524 |
s->streams[i], |
| 525 |
16*syncpoints[j-1], |
| 526 |
last_pts + A, |
| 527 |
0,
|
| 528 |
0,
|
| 529 |
AVINDEX_KEYFRAME); |
| 530 |
last_pts += A + B; |
| 531 |
} |
| 532 |
} |
| 533 |
} |
| 534 |
} |
| 535 |
|
| 536 |
if(skip_reserved(bc, end) || get_checksum(bc)){
|
| 537 |
av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
|
| 538 |
return -1; |
| 539 |
} |
| 540 |
return 0; |
| 541 |
} |
| 542 |
|
| 543 |
static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap) |
| 544 |
{
|
| 545 |
NUTContext *nut = s->priv_data; |
| 546 |
ByteIOContext *bc = &s->pb; |
| 547 |
int64_t pos; |
| 548 |
int inited_stream_count;
|
| 549 |
|
| 550 |
nut->avf= s; |
| 551 |
|
| 552 |
/* main header */
|
| 553 |
pos=0;
|
| 554 |
do{
|
| 555 |
pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
|
| 556 |
if (pos<0+1){ |
| 557 |
av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
|
| 558 |
return -1; |
| 559 |
} |
| 560 |
}while(decode_main_header(nut) < 0); |
| 561 |
|
| 562 |
/* stream headers */
|
| 563 |
pos=0;
|
| 564 |
for(inited_stream_count=0; inited_stream_count < s->nb_streams;){ |
| 565 |
pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
|
| 566 |
if (pos<0+1){ |
| 567 |
av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
|
| 568 |
return -1; |
| 569 |
} |
| 570 |
if(decode_stream_header(nut) >= 0) |
| 571 |
inited_stream_count++; |
| 572 |
} |
| 573 |
|
| 574 |
/* info headers */
|
| 575 |
pos=0;
|
| 576 |
for(;;){
|
| 577 |
uint64_t startcode= find_any_startcode(bc, pos); |
| 578 |
pos= url_ftell(bc); |
| 579 |
|
| 580 |
if(startcode==0){ |
| 581 |
av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
|
| 582 |
return -1; |
| 583 |
}else if(startcode == SYNCPOINT_STARTCODE){ |
| 584 |
nut->next_startcode= startcode; |
| 585 |
break;
|
| 586 |
}else if(startcode != INFO_STARTCODE){ |
| 587 |
continue;
|
| 588 |
} |
| 589 |
|
| 590 |
decode_info_header(nut); |
| 591 |
} |
| 592 |
|
| 593 |
s->data_offset= pos-8;
|
| 594 |
|
| 595 |
if(!url_is_streamed(bc)){
|
| 596 |
int64_t orig_pos= url_ftell(bc); |
| 597 |
find_and_decode_index(nut); |
| 598 |
url_fseek(bc, orig_pos, SEEK_SET); |
| 599 |
} |
| 600 |
assert(nut->next_startcode == SYNCPOINT_STARTCODE); |
| 601 |
|
| 602 |
return 0; |
| 603 |
} |
| 604 |
|
| 605 |
static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id, int frame_code){ |
| 606 |
AVFormatContext *s= nut->avf; |
| 607 |
ByteIOContext *bc = &s->pb; |
| 608 |
StreamContext *stc; |
| 609 |
int size, flags, size_mul, pts_delta, i, reserved_count;
|
| 610 |
uint64_t tmp; |
| 611 |
|
| 612 |
if(url_ftell(bc) > nut->last_syncpoint_pos + nut->max_distance){
|
| 613 |
av_log(s, AV_LOG_ERROR, "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n", url_ftell(bc), nut->last_syncpoint_pos, nut->max_distance); |
| 614 |
return -1; |
| 615 |
} |
| 616 |
|
| 617 |
flags = nut->frame_code[frame_code].flags; |
| 618 |
size_mul = nut->frame_code[frame_code].size_mul; |
| 619 |
size = nut->frame_code[frame_code].size_lsb; |
| 620 |
*stream_id = nut->frame_code[frame_code].stream_id; |
| 621 |
pts_delta = nut->frame_code[frame_code].pts_delta; |
| 622 |
reserved_count = nut->frame_code[frame_code].reserved_count; |
| 623 |
|
| 624 |
if(flags & FLAG_INVALID)
|
| 625 |
return -1; |
| 626 |
if(flags & FLAG_CODED)
|
| 627 |
flags ^= get_v(bc); |
| 628 |
if(flags & FLAG_STREAM_ID){
|
| 629 |
GET_V(*stream_id, tmp < s->nb_streams) |
| 630 |
} |
| 631 |
stc= &nut->stream[*stream_id]; |
| 632 |
if(flags&FLAG_CODED_PTS){
|
| 633 |
int coded_pts= get_v(bc);
|
| 634 |
//FIXME check last_pts validity?
|
| 635 |
if(coded_pts < (1<<stc->msb_pts_shift)){ |
| 636 |
*pts=ff_lsb2full(stc, coded_pts); |
| 637 |
}else
|
| 638 |
*pts=coded_pts - (1<<stc->msb_pts_shift);
|
| 639 |
}else
|
| 640 |
*pts= stc->last_pts + pts_delta; |
| 641 |
if(flags&FLAG_SIZE_MSB){
|
| 642 |
size += size_mul*get_v(bc); |
| 643 |
} |
| 644 |
if(flags&FLAG_RESERVED)
|
| 645 |
reserved_count= get_v(bc); |
| 646 |
for(i=0; i<reserved_count; i++) |
| 647 |
get_v(bc); |
| 648 |
if(flags&FLAG_CHECKSUM){
|
| 649 |
get_be32(bc); //FIXME check this
|
| 650 |
}else if(size > 2*nut->max_distance || FFABS(stc->last_pts - *pts) > stc->max_pts_distance){ |
| 651 |
av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
|
| 652 |
return -1; |
| 653 |
} |
| 654 |
|
| 655 |
stc->last_pts= *pts; |
| 656 |
stc->last_flags= flags; |
| 657 |
|
| 658 |
return size;
|
| 659 |
} |
| 660 |
|
| 661 |
static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code){ |
| 662 |
AVFormatContext *s= nut->avf; |
| 663 |
ByteIOContext *bc = &s->pb; |
| 664 |
int size, stream_id, discard;
|
| 665 |
int64_t pts, last_IP_pts; |
| 666 |
StreamContext *stc; |
| 667 |
|
| 668 |
size= decode_frame_header(nut, &pts, &stream_id, frame_code); |
| 669 |
if(size < 0) |
| 670 |
return -1; |
| 671 |
|
| 672 |
stc= &nut->stream[stream_id]; |
| 673 |
|
| 674 |
if (stc->last_flags & FLAG_KEY)
|
| 675 |
stc->skip_until_key_frame=0;
|
| 676 |
|
| 677 |
discard= s->streams[ stream_id ]->discard; |
| 678 |
last_IP_pts= s->streams[ stream_id ]->last_IP_pts; |
| 679 |
if( (discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY))
|
| 680 |
||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts) |
| 681 |
|| discard >= AVDISCARD_ALL |
| 682 |
|| stc->skip_until_key_frame){
|
| 683 |
url_fskip(bc, size); |
| 684 |
return 1; |
| 685 |
} |
| 686 |
|
| 687 |
av_get_packet(bc, pkt, size); |
| 688 |
pkt->stream_index = stream_id; |
| 689 |
if (stc->last_flags & FLAG_KEY)
|
| 690 |
pkt->flags |= PKT_FLAG_KEY; |
| 691 |
pkt->pts = pts; |
| 692 |
|
| 693 |
return 0; |
| 694 |
} |
| 695 |
|
| 696 |
static int nut_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 697 |
{
|
| 698 |
NUTContext *nut = s->priv_data; |
| 699 |
ByteIOContext *bc = &s->pb; |
| 700 |
int i, frame_code=0, ret, skip; |
| 701 |
int64_t ts, back_ptr; |
| 702 |
|
| 703 |
for(;;){
|
| 704 |
int64_t pos= url_ftell(bc); |
| 705 |
uint64_t tmp= nut->next_startcode; |
| 706 |
nut->next_startcode=0;
|
| 707 |
|
| 708 |
if(tmp){
|
| 709 |
pos-=8;
|
| 710 |
}else{
|
| 711 |
frame_code = get_byte(bc); |
| 712 |
if(url_feof(bc))
|
| 713 |
return -1; |
| 714 |
if(frame_code == 'N'){ |
| 715 |
tmp= frame_code; |
| 716 |
for(i=1; i<8; i++) |
| 717 |
tmp = (tmp<<8) + get_byte(bc);
|
| 718 |
} |
| 719 |
} |
| 720 |
switch(tmp){
|
| 721 |
case MAIN_STARTCODE:
|
| 722 |
case STREAM_STARTCODE:
|
| 723 |
case INDEX_STARTCODE:
|
| 724 |
skip= get_packetheader(nut, bc, 0, tmp);
|
| 725 |
url_fseek(bc, skip, SEEK_CUR); |
| 726 |
break;
|
| 727 |
case INFO_STARTCODE:
|
| 728 |
if(decode_info_header(nut)<0) |
| 729 |
goto resync;
|
| 730 |
break;
|
| 731 |
case SYNCPOINT_STARTCODE:
|
| 732 |
if(decode_syncpoint(nut, &ts, &back_ptr)<0) |
| 733 |
goto resync;
|
| 734 |
frame_code = get_byte(bc); |
| 735 |
case 0: |
| 736 |
ret= decode_frame(nut, pkt, frame_code); |
| 737 |
if(ret==0) |
| 738 |
return 0; |
| 739 |
else if(ret==1) //ok but discard packet |
| 740 |
break;
|
| 741 |
default:
|
| 742 |
resync:
|
| 743 |
av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos); |
| 744 |
tmp= find_any_startcode(bc, nut->last_syncpoint_pos+1);
|
| 745 |
if(tmp==0) |
| 746 |
return -1; |
| 747 |
av_log(s, AV_LOG_DEBUG, "sync\n");
|
| 748 |
nut->next_startcode= tmp; |
| 749 |
} |
| 750 |
} |
| 751 |
} |
| 752 |
|
| 753 |
static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){ |
| 754 |
NUTContext *nut = s->priv_data; |
| 755 |
ByteIOContext *bc = &s->pb; |
| 756 |
int64_t pos, pts, back_ptr; |
| 757 |
av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit); |
| 758 |
|
| 759 |
pos= *pos_arg; |
| 760 |
resync:
|
| 761 |
do{
|
| 762 |
pos= find_startcode(bc, SYNCPOINT_STARTCODE, pos)+1;
|
| 763 |
if(pos < 1){ |
| 764 |
assert(nut->next_startcode == 0);
|
| 765 |
av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
|
| 766 |
return AV_NOPTS_VALUE;
|
| 767 |
} |
| 768 |
}while(decode_syncpoint(nut, &pts, &back_ptr) < 0); |
| 769 |
*pos_arg = pos-1;
|
| 770 |
assert(nut->last_syncpoint_pos == *pos_arg); |
| 771 |
|
| 772 |
av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts,back_ptr ); |
| 773 |
if (stream_index == -1) return pts; |
| 774 |
else if(stream_index == -2) return back_ptr; |
| 775 |
|
| 776 |
assert(0);
|
| 777 |
} |
| 778 |
|
| 779 |
static int read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags){ |
| 780 |
NUTContext *nut = s->priv_data; |
| 781 |
AVStream *st= s->streams[stream_index]; |
| 782 |
syncpoint_t dummy={.ts= pts*av_q2d(st->time_base)*AV_TIME_BASE};
|
| 783 |
syncpoint_t nopts_sp= {.ts= AV_NOPTS_VALUE, .back_ptr= AV_NOPTS_VALUE};
|
| 784 |
syncpoint_t *sp, *next_node[2]= {&nopts_sp, &nopts_sp};
|
| 785 |
int64_t pos, pos2, ts; |
| 786 |
int i;
|
| 787 |
|
| 788 |
if(st->index_entries){
|
| 789 |
int index= av_index_search_timestamp(st, pts, flags);
|
| 790 |
if(index<0) |
| 791 |
return -1; |
| 792 |
|
| 793 |
pos2= st->index_entries[index].pos; |
| 794 |
ts = st->index_entries[index].timestamp; |
| 795 |
}else{
|
| 796 |
av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pts_cmp, next_node); |
| 797 |
av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n", next_node[0]->pos, next_node[1]->pos, |
| 798 |
next_node[0]->ts , next_node[1]->ts); |
| 799 |
pos= av_gen_search(s, -1, dummy.ts, next_node[0]->pos, next_node[1]->pos, next_node[1]->pos, |
| 800 |
next_node[0]->ts , next_node[1]->ts, AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp); |
| 801 |
|
| 802 |
if(!(flags & AVSEEK_FLAG_BACKWARD)){
|
| 803 |
dummy.pos= pos+16;
|
| 804 |
next_node[1]= &nopts_sp;
|
| 805 |
av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp, next_node); |
| 806 |
pos2= av_gen_search(s, -2, dummy.pos, next_node[0]->pos , next_node[1]->pos, next_node[1]->pos, |
| 807 |
next_node[0]->back_ptr, next_node[1]->back_ptr, flags, &ts, nut_read_timestamp); |
| 808 |
if(pos2>=0) |
| 809 |
pos= pos2; |
| 810 |
//FIXME dir but i think it does not matter
|
| 811 |
} |
| 812 |
dummy.pos= pos; |
| 813 |
sp= av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp, NULL);
|
| 814 |
|
| 815 |
assert(sp); |
| 816 |
pos2= sp->back_ptr - 15;
|
| 817 |
} |
| 818 |
av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2); |
| 819 |
pos= find_startcode(&s->pb, SYNCPOINT_STARTCODE, pos2); |
| 820 |
url_fseek(&s->pb, pos, SEEK_SET); |
| 821 |
av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos); |
| 822 |
if(pos2 > pos || pos2 + 15 < pos){ |
| 823 |
av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n"); |
| 824 |
} |
| 825 |
for(i=0; i<s->nb_streams; i++) |
| 826 |
nut->stream[i].skip_until_key_frame=1;
|
| 827 |
|
| 828 |
return 0; |
| 829 |
} |
| 830 |
|
| 831 |
static int nut_read_close(AVFormatContext *s) |
| 832 |
{
|
| 833 |
NUTContext *nut = s->priv_data; |
| 834 |
|
| 835 |
av_freep(&nut->time_base); |
| 836 |
av_freep(&nut->stream); |
| 837 |
|
| 838 |
return 0; |
| 839 |
} |
| 840 |
|
| 841 |
#ifdef CONFIG_NUT_DEMUXER
|
| 842 |
AVInputFormat nut_demuxer = {
|
| 843 |
"nut",
|
| 844 |
"nut format",
|
| 845 |
sizeof(NUTContext),
|
| 846 |
nut_probe, |
| 847 |
nut_read_header, |
| 848 |
nut_read_packet, |
| 849 |
nut_read_close, |
| 850 |
read_seek, |
| 851 |
.extensions = "nut",
|
| 852 |
}; |
| 853 |
#endif
|