841 lines
26 KiB
C
841 lines
26 KiB
C
/*
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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 int get_str(ByteIOContext *bc, char *string, unsigned int maxlen){
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unsigned int len= ff_get_v(bc);
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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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if(maxlen)
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string[FFMIN(len, maxlen-1)]= 0;
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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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static int64_t get_s(ByteIOContext *bc){
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int64_t v = ff_get_v(bc) + 1;
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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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static uint64_t get_fourcc(ByteIOContext *bc){
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unsigned int len= ff_get_v(bc);
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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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#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= ff_get_v(bc);
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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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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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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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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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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 ff_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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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= ff_crc04C11DB7_update(0, &startcode, 8);
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init_checksum(bc, ff_crc04C11DB7_update, startcode);
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size= ff_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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init_checksum(bc, calculate_checksum ? ff_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= ff_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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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 = ff_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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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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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 = ff_get_v(bc);
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int tmp_fields= ff_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 = ff_get_v(bc);
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if(tmp_fields>2) tmp_stream= ff_get_v(bc);
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if(tmp_fields>3) tmp_size = ff_get_v(bc);
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else tmp_size = 0;
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if(tmp_fields>4) tmp_res = ff_get_v(bc);
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else tmp_res = 0;
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if(tmp_fields>5) count = ff_get_v(bc);
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else count = tmp_mul - tmp_size;
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while(tmp_fields-- > 6)
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ff_get_v(bc);
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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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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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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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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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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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end= get_packetheader(nut, bc, 1, STREAM_STARTCODE);
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end += url_ftell(bc);
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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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st = s->streams[stream_id];
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if (!st)
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return AVERROR(ENOMEM);
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class = ff_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= ff_get_v(bc);
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GET_V(stc->decode_delay , tmp < 1000); //sanity limit, raise this if Moore's law is true
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st->codec->has_b_frames= stc->decode_delay;
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ff_get_v(bc); //stream flags
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GET_V(st->codec->extradata_size, tmp < (1<<30));
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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);
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}
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if (st->codec->codec_type == CODEC_TYPE_VIDEO){
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GET_V(st->codec->width , tmp > 0)
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GET_V(st->codec->height, tmp > 0)
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st->codec->sample_aspect_ratio.num= ff_get_v(bc);
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st->codec->sample_aspect_ratio.den= ff_get_v(bc);
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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;
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}
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ff_get_v(bc); /* csp type */
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}else if (st->codec->codec_type == CODEC_TYPE_AUDIO){
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GET_V(st->codec->sample_rate , tmp > 0)
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tmp= ff_get_v(bc); // samplerate_den
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if(tmp > st->codec->sample_rate){
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av_log(s, AV_LOG_ERROR, "Bleh, libnut muxed this ;)\n");
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st->codec->sample_rate= tmp;
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}
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GET_V(st->codec->channels, tmp > 0)
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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, "stream header %d checksum mismatch\n", stream_id);
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return -1;
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}
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stc->time_base= &nut->time_base[stc->time_base_id];
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av_set_pts_info(s->streams[stream_id], 63, stc->time_base->num, stc->time_base->den);
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return 0;
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}
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static int decode_info_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;
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unsigned int stream_id_plus1, chapter_start, chapter_len, count;
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int chapter_id, i;
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int64_t value, end;
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char name[256], str_value[1024], type_str[256], *type= type_str;
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end= get_packetheader(nut, bc, 1, INFO_STARTCODE);
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end += url_ftell(bc);
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GET_V(stream_id_plus1, tmp <= s->nb_streams)
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chapter_id = get_s(bc);
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chapter_start= ff_get_v(bc);
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chapter_len = ff_get_v(bc);
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count = ff_get_v(bc);
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for(i=0; i<count; i++){
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get_str(bc, name, sizeof(name));
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value= get_s(bc);
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if(value == -1){
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type= "UTF-8";
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get_str(bc, str_value, sizeof(str_value));
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}else if(value == -2){
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get_str(bc, type, sizeof(type));
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get_str(bc, str_value, sizeof(str_value));
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}else if(value == -3){
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type= "s";
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value= get_s(bc);
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}else if(value == -4){
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type= "t";
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value= ff_get_v(bc);
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}else if(value < -4){
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type= "r";
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get_s(bc);
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}else{
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type= "v";
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}
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if(chapter_id==0 && !strcmp(type, "UTF-8")){
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if (!strcmp(name, "Author"))
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av_strlcpy(s->author , str_value, sizeof(s->author));
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else if(!strcmp(name, "Title"))
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av_strlcpy(s->title , str_value, sizeof(s->title));
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else if(!strcmp(name, "Copyright"))
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av_strlcpy(s->copyright, str_value, sizeof(s->copyright));
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else if(!strcmp(name, "Description"))
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av_strlcpy(s->comment , str_value, sizeof(s->comment));
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}
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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, "info header checksum mismatch\n");
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return -1;
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}
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return 0;
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}
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static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr){
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AVFormatContext *s= nut->avf;
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ByteIOContext *bc = &s->pb;
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int64_t end, tmp;
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nut->last_syncpoint_pos= url_ftell(bc)-8;
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end= get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
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end += url_ftell(bc);
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tmp= ff_get_v(bc);
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*back_ptr= nut->last_syncpoint_pos - 16*ff_get_v(bc);
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if(*back_ptr < 0)
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return -1;
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ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count], tmp);
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if(skip_reserved(bc, end) || get_checksum(bc)){
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av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
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return -1;
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}
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*ts= tmp / s->nb_streams * av_q2d(nut->time_base[tmp % s->nb_streams])*AV_TIME_BASE;
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ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts);
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return 0;
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}
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static int find_and_decode_index(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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int i, j, syncpoint_count;
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int64_t filesize= url_fsize(bc);
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int64_t *syncpoints;
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int8_t *has_keyframe;
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url_fseek(bc, filesize-12, SEEK_SET);
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url_fseek(bc, filesize-get_be64(bc), SEEK_SET);
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if(get_be64(bc) != INDEX_STARTCODE){
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av_log(s, AV_LOG_ERROR, "no index at the end\n");
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return -1;
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}
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end= get_packetheader(nut, bc, 1, INDEX_STARTCODE);
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end += url_ftell(bc);
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ff_get_v(bc); //max_pts
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GET_V(syncpoint_count, tmp < INT_MAX/8 && tmp > 0)
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syncpoints= av_malloc(sizeof(int64_t)*syncpoint_count);
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has_keyframe= av_malloc(sizeof(int8_t)*(syncpoint_count+1));
|
|
for(i=0; i<syncpoint_count; i++){
|
|
GET_V(syncpoints[i], tmp>0)
|
|
if(i)
|
|
syncpoints[i] += syncpoints[i-1];
|
|
}
|
|
|
|
for(i=0; i<s->nb_streams; i++){
|
|
int64_t last_pts= -1;
|
|
for(j=0; j<syncpoint_count;){
|
|
uint64_t x= ff_get_v(bc);
|
|
int type= x&1;
|
|
int n= j;
|
|
x>>=1;
|
|
if(type){
|
|
int flag= x&1;
|
|
x>>=1;
|
|
if(n+x >= syncpoint_count + 1){
|
|
av_log(s, AV_LOG_ERROR, "index overflow A\n");
|
|
return -1;
|
|
}
|
|
while(x--)
|
|
has_keyframe[n++]= flag;
|
|
has_keyframe[n++]= !flag;
|
|
}else{
|
|
while(x != 1){
|
|
if(n>=syncpoint_count + 1){
|
|
av_log(s, AV_LOG_ERROR, "index overflow B\n");
|
|
return -1;
|
|
}
|
|
has_keyframe[n++]= x&1;
|
|
x>>=1;
|
|
}
|
|
}
|
|
if(has_keyframe[0]){
|
|
av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
|
|
return -1;
|
|
}
|
|
assert(n<=syncpoint_count+1);
|
|
for(; j<n; j++){
|
|
if(has_keyframe[j]){
|
|
uint64_t B, A= ff_get_v(bc);
|
|
if(!A){
|
|
A= ff_get_v(bc);
|
|
B= ff_get_v(bc);
|
|
//eor_pts[j][i] = last_pts + A + B
|
|
}else
|
|
B= 0;
|
|
av_add_index_entry(
|
|
s->streams[i],
|
|
16*syncpoints[j-1],
|
|
last_pts + A,
|
|
0,
|
|
0,
|
|
AVINDEX_KEYFRAME);
|
|
last_pts += A + B;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if(skip_reserved(bc, end) || get_checksum(bc)){
|
|
av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
|
|
{
|
|
NUTContext *nut = s->priv_data;
|
|
ByteIOContext *bc = &s->pb;
|
|
int64_t pos;
|
|
int inited_stream_count;
|
|
|
|
nut->avf= s;
|
|
|
|
/* main header */
|
|
pos=0;
|
|
do{
|
|
pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
|
|
if (pos<0+1){
|
|
av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
|
|
return -1;
|
|
}
|
|
}while(decode_main_header(nut) < 0);
|
|
|
|
/* stream headers */
|
|
pos=0;
|
|
for(inited_stream_count=0; inited_stream_count < s->nb_streams;){
|
|
pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
|
|
if (pos<0+1){
|
|
av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
|
|
return -1;
|
|
}
|
|
if(decode_stream_header(nut) >= 0)
|
|
inited_stream_count++;
|
|
}
|
|
|
|
/* info headers */
|
|
pos=0;
|
|
for(;;){
|
|
uint64_t startcode= find_any_startcode(bc, pos);
|
|
pos= url_ftell(bc);
|
|
|
|
if(startcode==0){
|
|
av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
|
|
return -1;
|
|
}else if(startcode == SYNCPOINT_STARTCODE){
|
|
nut->next_startcode= startcode;
|
|
break;
|
|
}else if(startcode != INFO_STARTCODE){
|
|
continue;
|
|
}
|
|
|
|
decode_info_header(nut);
|
|
}
|
|
|
|
s->data_offset= pos-8;
|
|
|
|
if(!url_is_streamed(bc)){
|
|
int64_t orig_pos= url_ftell(bc);
|
|
find_and_decode_index(nut);
|
|
url_fseek(bc, orig_pos, SEEK_SET);
|
|
}
|
|
assert(nut->next_startcode == SYNCPOINT_STARTCODE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id, int frame_code){
|
|
AVFormatContext *s= nut->avf;
|
|
ByteIOContext *bc = &s->pb;
|
|
StreamContext *stc;
|
|
int size, flags, size_mul, pts_delta, i, reserved_count;
|
|
uint64_t tmp;
|
|
|
|
if(url_ftell(bc) > nut->last_syncpoint_pos + nut->max_distance){
|
|
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);
|
|
return -1;
|
|
}
|
|
|
|
flags = nut->frame_code[frame_code].flags;
|
|
size_mul = nut->frame_code[frame_code].size_mul;
|
|
size = nut->frame_code[frame_code].size_lsb;
|
|
*stream_id = nut->frame_code[frame_code].stream_id;
|
|
pts_delta = nut->frame_code[frame_code].pts_delta;
|
|
reserved_count = nut->frame_code[frame_code].reserved_count;
|
|
|
|
if(flags & FLAG_INVALID)
|
|
return -1;
|
|
if(flags & FLAG_CODED)
|
|
flags ^= ff_get_v(bc);
|
|
if(flags & FLAG_STREAM_ID){
|
|
GET_V(*stream_id, tmp < s->nb_streams)
|
|
}
|
|
stc= &nut->stream[*stream_id];
|
|
if(flags&FLAG_CODED_PTS){
|
|
int coded_pts= ff_get_v(bc);
|
|
//FIXME check last_pts validity?
|
|
if(coded_pts < (1<<stc->msb_pts_shift)){
|
|
*pts=ff_lsb2full(stc, coded_pts);
|
|
}else
|
|
*pts=coded_pts - (1<<stc->msb_pts_shift);
|
|
}else
|
|
*pts= stc->last_pts + pts_delta;
|
|
if(flags&FLAG_SIZE_MSB){
|
|
size += size_mul*ff_get_v(bc);
|
|
}
|
|
if(flags&FLAG_RESERVED)
|
|
reserved_count= ff_get_v(bc);
|
|
for(i=0; i<reserved_count; i++)
|
|
ff_get_v(bc);
|
|
if(flags&FLAG_CHECKSUM){
|
|
get_be32(bc); //FIXME check this
|
|
}else if(size > 2*nut->max_distance || FFABS(stc->last_pts - *pts) > stc->max_pts_distance){
|
|
av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
|
|
return -1;
|
|
}
|
|
|
|
stc->last_pts= *pts;
|
|
stc->last_flags= flags;
|
|
|
|
return size;
|
|
}
|
|
|
|
static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code){
|
|
AVFormatContext *s= nut->avf;
|
|
ByteIOContext *bc = &s->pb;
|
|
int size, stream_id, discard;
|
|
int64_t pts, last_IP_pts;
|
|
StreamContext *stc;
|
|
|
|
size= decode_frame_header(nut, &pts, &stream_id, frame_code);
|
|
if(size < 0)
|
|
return -1;
|
|
|
|
stc= &nut->stream[stream_id];
|
|
|
|
if (stc->last_flags & FLAG_KEY)
|
|
stc->skip_until_key_frame=0;
|
|
|
|
discard= s->streams[ stream_id ]->discard;
|
|
last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
|
|
if( (discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY))
|
|
||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
|
|
|| discard >= AVDISCARD_ALL
|
|
|| stc->skip_until_key_frame){
|
|
url_fskip(bc, size);
|
|
return 1;
|
|
}
|
|
|
|
av_get_packet(bc, pkt, size);
|
|
pkt->stream_index = stream_id;
|
|
if (stc->last_flags & FLAG_KEY)
|
|
pkt->flags |= PKT_FLAG_KEY;
|
|
pkt->pts = pts;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
NUTContext *nut = s->priv_data;
|
|
ByteIOContext *bc = &s->pb;
|
|
int i, frame_code=0, ret, skip;
|
|
int64_t ts, back_ptr;
|
|
|
|
for(;;){
|
|
int64_t pos= url_ftell(bc);
|
|
uint64_t tmp= nut->next_startcode;
|
|
nut->next_startcode=0;
|
|
|
|
if(tmp){
|
|
pos-=8;
|
|
}else{
|
|
frame_code = get_byte(bc);
|
|
if(url_feof(bc))
|
|
return -1;
|
|
if(frame_code == 'N'){
|
|
tmp= frame_code;
|
|
for(i=1; i<8; i++)
|
|
tmp = (tmp<<8) + get_byte(bc);
|
|
}
|
|
}
|
|
switch(tmp){
|
|
case MAIN_STARTCODE:
|
|
case STREAM_STARTCODE:
|
|
case INDEX_STARTCODE:
|
|
skip= get_packetheader(nut, bc, 0, tmp);
|
|
url_fseek(bc, skip, SEEK_CUR);
|
|
break;
|
|
case INFO_STARTCODE:
|
|
if(decode_info_header(nut)<0)
|
|
goto resync;
|
|
break;
|
|
case SYNCPOINT_STARTCODE:
|
|
if(decode_syncpoint(nut, &ts, &back_ptr)<0)
|
|
goto resync;
|
|
frame_code = get_byte(bc);
|
|
case 0:
|
|
ret= decode_frame(nut, pkt, frame_code);
|
|
if(ret==0)
|
|
return 0;
|
|
else if(ret==1) //ok but discard packet
|
|
break;
|
|
default:
|
|
resync:
|
|
av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
|
|
tmp= find_any_startcode(bc, nut->last_syncpoint_pos+1);
|
|
if(tmp==0)
|
|
return -1;
|
|
av_log(s, AV_LOG_DEBUG, "sync\n");
|
|
nut->next_startcode= tmp;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
|
|
NUTContext *nut = s->priv_data;
|
|
ByteIOContext *bc = &s->pb;
|
|
int64_t pos, pts, back_ptr;
|
|
av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit);
|
|
|
|
pos= *pos_arg;
|
|
do{
|
|
pos= find_startcode(bc, SYNCPOINT_STARTCODE, pos)+1;
|
|
if(pos < 1){
|
|
assert(nut->next_startcode == 0);
|
|
av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
|
|
return AV_NOPTS_VALUE;
|
|
}
|
|
}while(decode_syncpoint(nut, &pts, &back_ptr) < 0);
|
|
*pos_arg = pos-1;
|
|
assert(nut->last_syncpoint_pos == *pos_arg);
|
|
|
|
av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts,back_ptr );
|
|
if (stream_index == -1) return pts;
|
|
else if(stream_index == -2) return back_ptr;
|
|
|
|
assert(0);
|
|
}
|
|
|
|
static int read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags){
|
|
NUTContext *nut = s->priv_data;
|
|
AVStream *st= s->streams[stream_index];
|
|
syncpoint_t dummy={.ts= pts*av_q2d(st->time_base)*AV_TIME_BASE};
|
|
syncpoint_t nopts_sp= {.ts= AV_NOPTS_VALUE, .back_ptr= AV_NOPTS_VALUE};
|
|
syncpoint_t *sp, *next_node[2]= {&nopts_sp, &nopts_sp};
|
|
int64_t pos, pos2, ts;
|
|
int i;
|
|
|
|
if(st->index_entries){
|
|
int index= av_index_search_timestamp(st, pts, flags);
|
|
if(index<0)
|
|
return -1;
|
|
|
|
pos2= st->index_entries[index].pos;
|
|
ts = st->index_entries[index].timestamp;
|
|
}else{
|
|
av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pts_cmp, next_node);
|
|
av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n", next_node[0]->pos, next_node[1]->pos,
|
|
next_node[0]->ts , next_node[1]->ts);
|
|
pos= av_gen_search(s, -1, dummy.ts, next_node[0]->pos, next_node[1]->pos, next_node[1]->pos,
|
|
next_node[0]->ts , next_node[1]->ts, AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
|
|
|
|
if(!(flags & AVSEEK_FLAG_BACKWARD)){
|
|
dummy.pos= pos+16;
|
|
next_node[1]= &nopts_sp;
|
|
av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp, next_node);
|
|
pos2= av_gen_search(s, -2, dummy.pos, next_node[0]->pos , next_node[1]->pos, next_node[1]->pos,
|
|
next_node[0]->back_ptr, next_node[1]->back_ptr, flags, &ts, nut_read_timestamp);
|
|
if(pos2>=0)
|
|
pos= pos2;
|
|
//FIXME dir but i think it does not matter
|
|
}
|
|
dummy.pos= pos;
|
|
sp= av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp, NULL);
|
|
|
|
assert(sp);
|
|
pos2= sp->back_ptr - 15;
|
|
}
|
|
av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
|
|
pos= find_startcode(&s->pb, SYNCPOINT_STARTCODE, pos2);
|
|
url_fseek(&s->pb, pos, SEEK_SET);
|
|
av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
|
|
if(pos2 > pos || pos2 + 15 < pos){
|
|
av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
|
|
}
|
|
for(i=0; i<s->nb_streams; i++)
|
|
nut->stream[i].skip_until_key_frame=1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nut_read_close(AVFormatContext *s)
|
|
{
|
|
NUTContext *nut = s->priv_data;
|
|
|
|
av_freep(&nut->time_base);
|
|
av_freep(&nut->stream);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_NUT_DEMUXER
|
|
AVInputFormat nut_demuxer = {
|
|
"nut",
|
|
"nut format",
|
|
sizeof(NUTContext),
|
|
nut_probe,
|
|
nut_read_header,
|
|
nut_read_packet,
|
|
nut_read_close,
|
|
read_seek,
|
|
.extensions = "nut",
|
|
};
|
|
#endif
|