diff options
Diffstat (limited to 'contrib/ffmpeg/libavformat/nutdec.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/nutdec.c | 885 |
1 files changed, 0 insertions, 885 deletions
diff --git a/contrib/ffmpeg/libavformat/nutdec.c b/contrib/ffmpeg/libavformat/nutdec.c deleted file mode 100644 index c0f331c27..000000000 --- a/contrib/ffmpeg/libavformat/nutdec.c +++ /dev/null @@ -1,885 +0,0 @@ -/* - * "NUT" Container Format demuxer - * Copyright (c) 2004-2006 Michael Niedermayer - * Copyright (c) 2003 Alex Beregszaszi - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - * - */ - -#include "tree.h" -#include "nut.h" - -#undef NDEBUG -#include <assert.h> - -static uint64_t get_v(ByteIOContext *bc){ - uint64_t val = 0; - int tmp; - - do{ - tmp = get_byte(bc); - val= (val<<7) + (tmp&127); - }while(tmp&128); - return val; -} - -static int get_str(ByteIOContext *bc, char *string, unsigned int maxlen){ - unsigned int len= get_v(bc); - - if(len && maxlen) - get_buffer(bc, string, FFMIN(len, maxlen)); - while(len > maxlen){ - get_byte(bc); - len--; - } - - if(maxlen) - string[FFMIN(len, maxlen-1)]= 0; - - if(maxlen == len) - return -1; - else - return 0; -} - -static int64_t get_s(ByteIOContext *bc){ - int64_t v = get_v(bc) + 1; - - if (v&1) return -(v>>1); - else return (v>>1); -} - -static uint64_t get_fourcc(ByteIOContext *bc){ - unsigned int len= get_v(bc); - - if (len==2) return get_le16(bc); - else if(len==4) return get_le32(bc); - else return -1; -} - -#ifdef TRACE -static inline uint64_t get_v_trace(ByteIOContext *bc, char *file, char *func, int line){ - uint64_t v= get_v(bc); - - printf("get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); - return v; -} - -static inline int64_t get_s_trace(ByteIOContext *bc, char *file, char *func, int line){ - int64_t v= get_s(bc); - - printf("get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); - return v; -} - -static inline uint64_t get_vb_trace(ByteIOContext *bc, char *file, char *func, int line){ - uint64_t v= get_vb(bc); - - printf("get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); - return v; -} -#define get_v(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) -#define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) -#define get_vb(bc) get_vb_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__) -#endif - -static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum) -{ - int64_t start, size; -// start= url_ftell(bc) - 8; - - size= get_v(bc); - if(size > 4096) - get_be32(bc); //FIXME check this - - init_checksum(bc, calculate_checksum ? av_crc04C11DB7_update : NULL, 0); - -// nut->packet_start[2] = start; -// nut->written_packet_size= size; - - return size; -} - -static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){ - uint64_t state=0; - - if(pos >= 0) - url_fseek(bc, pos, SEEK_SET); //note, this may fail if the stream isnt seekable, but that shouldnt matter, as in this case we simply start where we are currently - - while(!url_feof(bc)){ - state= (state<<8) | get_byte(bc); - if((state>>56) != 'N') - continue; - switch(state){ - case MAIN_STARTCODE: - case STREAM_STARTCODE: - case SYNCPOINT_STARTCODE: - case INFO_STARTCODE: - case INDEX_STARTCODE: - return state; - } - } - - return 0; -} - -/** - * find the given startcode. - * @param code the startcode - * @param pos the start position of the search, or -1 if the current position - * @returns the position of the startcode or -1 if not found - */ -static int64_t find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){ - for(;;){ - uint64_t startcode= find_any_startcode(bc, pos); - if(startcode == code) - return url_ftell(bc) - 8; - else if(startcode == 0) - return -1; - pos=-1; - } -} - -static int64_t lsb2full(StreamContext *stream, int64_t lsb){ - int64_t mask = (1<<stream->msb_pts_shift)-1; - int64_t delta= stream->last_pts - mask/2; - return ((lsb - delta)&mask) + delta; -} - -static int nut_probe(AVProbeData *p){ - int i; - uint64_t code= 0; - - for (i = 0; i < p->buf_size; i++) { - code = (code << 8) | p->buf[i]; - if (code == MAIN_STARTCODE) - return AVPROBE_SCORE_MAX; - } - return 0; -} - -#define GET_V(dst, check) \ - tmp= get_v(bc);\ - if(!(check)){\ - av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp);\ - return -1;\ - }\ - dst= tmp; - -static int skip_reserved(ByteIOContext *bc, int64_t pos){ - pos -= url_ftell(bc); - if(pos<0){ - url_fseek(bc, pos, SEEK_CUR); - return -1; - }else{ - while(pos--) - get_byte(bc); - return 0; - } -} - -static int decode_main_header(NUTContext *nut){ - AVFormatContext *s= nut->avf; - ByteIOContext *bc = &s->pb; - uint64_t tmp, end; - unsigned int stream_count; - int i, j, tmp_stream, tmp_mul, tmp_pts, tmp_size, count, tmp_res; - - end= get_packetheader(nut, bc, 1); - end += url_ftell(bc); - - GET_V(tmp , tmp >=2 && tmp <= 3) - GET_V(stream_count , tmp > 0 && tmp <=MAX_STREAMS) - - nut->max_distance = get_v(bc); - if(nut->max_distance > 65536){ - av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance); - nut->max_distance= 65536; - } - - GET_V(nut->time_base_count, tmp>0 && tmp<INT_MAX / sizeof(AVRational)) - nut->time_base= av_malloc(nut->time_base_count * sizeof(AVRational)); - - for(i=0; i<nut->time_base_count; i++){ - GET_V(nut->time_base[i].num, tmp>0 && tmp<(1ULL<<31)) - GET_V(nut->time_base[i].den, tmp>0 && tmp<(1ULL<<31)) - if(ff_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1){ - av_log(s, AV_LOG_ERROR, "time base invalid\n"); - return -1; - } - } - tmp_pts=0; - tmp_mul=1; - tmp_stream=0; - for(i=0; i<256;){ - int tmp_flags = get_v(bc); - int tmp_fields= get_v(bc); - if(tmp_fields>0) tmp_pts = get_s(bc); - if(tmp_fields>1) tmp_mul = get_v(bc); - if(tmp_fields>2) tmp_stream= get_v(bc); - if(tmp_fields>3) tmp_size = get_v(bc); - else tmp_size = 0; - if(tmp_fields>4) tmp_res = get_v(bc); - else tmp_res = 0; - if(tmp_fields>5) count = get_v(bc); - else count = tmp_mul - tmp_size; - - while(tmp_fields-- > 6) - get_v(bc); - - if(count == 0 || i+count > 256){ - av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i); - return -1; - } - if(tmp_stream >= stream_count){ - av_log(s, AV_LOG_ERROR, "illegal stream number\n"); - return -1; - } - - for(j=0; j<count; j++,i++){ - if (i == 'N') { - nut->frame_code[i].flags= FLAG_INVALID; - j--; - continue; - } - nut->frame_code[i].flags = tmp_flags ; - nut->frame_code[i].pts_delta = tmp_pts ; - nut->frame_code[i].stream_id = tmp_stream; - nut->frame_code[i].size_mul = tmp_mul ; - nut->frame_code[i].size_lsb = tmp_size+j; - nut->frame_code[i].reserved_count = tmp_res ; - } - } - assert(nut->frame_code['N'].flags == FLAG_INVALID); - - if(skip_reserved(bc, end) || get_checksum(bc)){ - av_log(s, AV_LOG_ERROR, "Main header checksum mismatch\n"); - return -1; - } - - nut->stream = av_mallocz(sizeof(StreamContext)*stream_count); - for(i=0; i<stream_count; i++){ - av_new_stream(s, i); - } - - return 0; -} - -static int decode_stream_header(NUTContext *nut){ - AVFormatContext *s= nut->avf; - ByteIOContext *bc = &s->pb; - StreamContext *stc; - int class, stream_id; - uint64_t tmp, end; - AVStream *st; - - end= get_packetheader(nut, bc, 1); - end += url_ftell(bc); - - GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base.num); - stc= &nut->stream[stream_id]; - - st = s->streams[stream_id]; - if (!st) - return AVERROR_NOMEM; - - class = get_v(bc); - tmp = get_fourcc(bc); - st->codec->codec_tag= tmp; - switch(class) - { - case 0: - st->codec->codec_type = CODEC_TYPE_VIDEO; - st->codec->codec_id = codec_get_bmp_id(tmp); - if (st->codec->codec_id == CODEC_ID_NONE) - av_log(s, AV_LOG_ERROR, "Unknown codec?!\n"); - break; - case 1: - st->codec->codec_type = CODEC_TYPE_AUDIO; - st->codec->codec_id = codec_get_wav_id(tmp); - if (st->codec->codec_id == CODEC_ID_NONE) - av_log(s, AV_LOG_ERROR, "Unknown codec?!\n"); - break; - case 2: -// st->codec->codec_type = CODEC_TYPE_TEXT; -// break; - case 3: - st->codec->codec_type = CODEC_TYPE_DATA; - break; - default: - av_log(s, AV_LOG_ERROR, "Unknown stream class (%d)\n", class); - return -1; - } - GET_V(stc->time_base_id , tmp < nut->time_base_count); - GET_V(stc->msb_pts_shift , tmp < 16); - stc->max_pts_distance= get_v(bc); - GET_V(stc->decode_delay , tmp < 1000); //sanity limit, raise this if moors law is true - st->codec->has_b_frames= stc->decode_delay; - get_v(bc); //stream flags - - GET_V(st->codec->extradata_size, tmp < (1<<30)); - if(st->codec->extradata_size){ - st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); - get_buffer(bc, st->codec->extradata, st->codec->extradata_size); - } - - if (st->codec->codec_type == CODEC_TYPE_VIDEO){ - GET_V(st->codec->width , tmp > 0) - GET_V(st->codec->height, tmp > 0) - st->codec->sample_aspect_ratio.num= get_v(bc); - st->codec->sample_aspect_ratio.den= get_v(bc); - if((!st->codec->sample_aspect_ratio.num) != (!st->codec->sample_aspect_ratio.den)){ - av_log(s, AV_LOG_ERROR, "invalid aspect ratio\n"); - return -1; - } - get_v(bc); /* csp type */ - }else if (st->codec->codec_type == CODEC_TYPE_AUDIO){ - GET_V(st->codec->sample_rate , tmp > 0) - tmp= get_v(bc); // samplerate_den - if(tmp > st->codec->sample_rate){ - av_log(s, AV_LOG_ERROR, "bleh, libnut muxed this ;)\n"); - st->codec->sample_rate= tmp; - } - GET_V(st->codec->channels, tmp > 0) - } - if(skip_reserved(bc, end) || get_checksum(bc)){ - av_log(s, AV_LOG_ERROR, "Stream header %d checksum mismatch\n", stream_id); - return -1; - } - stc->time_base= nut->time_base[stc->time_base_id]; - av_set_pts_info(s->streams[stream_id], 63, stc->time_base.num, stc->time_base.den); - return 0; -} - -static int decode_info_header(NUTContext *nut){ - AVFormatContext *s= nut->avf; - ByteIOContext *bc = &s->pb; - uint64_t tmp; - unsigned int stream_id_plus1, chapter_start, chapter_len, count; - int chapter_id, i; - int64_t value, end; - char name[256], str_value[1024], type_str[256], *type= type_str; - - end= get_packetheader(nut, bc, 1); - end += url_ftell(bc); - - GET_V(stream_id_plus1, tmp <= s->nb_streams) - chapter_id = get_s(bc); - chapter_start= get_v(bc); - chapter_len = get_v(bc); - count = get_v(bc); - for(i=0; i<count; i++){ - get_str(bc, name, sizeof(name)); - value= get_s(bc); - if(value == -1){ - type= "UTF-8"; - get_str(bc, str_value, sizeof(str_value)); - }else if(value == -2){ - get_str(bc, type, sizeof(type)); - get_str(bc, str_value, sizeof(str_value)); - }else if(value == -3){ - type= "s"; - value= get_s(bc); - }else if(value == -4){ - type= "t"; - value= get_v(bc); - }else if(value < -4){ - type= "r"; - get_s(bc); - }else{ - type= "v"; - } - - if(chapter_id==0 && !strcmp(type, "UTF-8")){ - if (!strcmp(name, "Author")) - pstrcpy(s->author , sizeof(s->author) , str_value); - else if(!strcmp(name, "Title")) - pstrcpy(s->title , sizeof(s->title) , str_value); - else if(!strcmp(name, "Copyright")) - pstrcpy(s->copyright, sizeof(s->copyright), str_value); - else if(!strcmp(name, "Description")) - pstrcpy(s->comment , sizeof(s->comment) , str_value); - } - } - - if(skip_reserved(bc, end) || get_checksum(bc)){ - av_log(s, AV_LOG_ERROR, "Info header checksum mismatch\n"); - return -1; - } - return 0; -} - -int sp_pos_cmp(syncpoint_t *a, syncpoint_t *b){ - return (a->pos - b->pos>>32) - (b->pos - a->pos>>32); -} - -int sp_pts_cmp(syncpoint_t *a, syncpoint_t *b){ - return (a->ts - b->ts>>32) - (b->ts - a->ts>>32); -} - -static void add_sp(NUTContext *nut, int64_t pos, int64_t back_ptr, int64_t ts){ - syncpoint_t *sp2, *sp= av_mallocz(sizeof(syncpoint_t)); - - sp->pos= pos; - sp->back_ptr= back_ptr; - sp->ts= ts; - sp2= av_tree_insert(&nut->syncpoints, sp, sp_pos_cmp); - if(sp2 && sp2 != sp) - av_free(sp); -} - -static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr){ - AVFormatContext *s= nut->avf; - ByteIOContext *bc = &s->pb; - int64_t end, tmp; - int i; - AVRational time_base; - - nut->last_syncpoint_pos= url_ftell(bc)-8; - - end= get_packetheader(nut, bc, 1); - end += url_ftell(bc); - - tmp= get_v(bc); - *back_ptr= nut->last_syncpoint_pos - 16*get_v(bc); - if(*back_ptr < 0) - return -1; - - time_base= nut->time_base[tmp % nut->time_base_count]; - for(i=0; i<s->nb_streams; i++){ - nut->stream[i].last_pts= av_rescale_rnd( - tmp / nut->time_base_count, - time_base.num * (int64_t)nut->stream[i].time_base.den, - time_base.den * (int64_t)nut->stream[i].time_base.num, - AV_ROUND_DOWN); - //last_key_frame ? - } - //FIXME put this in a reset func maybe - - if(skip_reserved(bc, end) || get_checksum(bc)){ - av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n"); - return -1; - } - - *ts= tmp / s->nb_streams * av_q2d(nut->time_base[tmp % s->nb_streams])*AV_TIME_BASE; - add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts); - - return 0; -} - -static int find_and_decode_index(NUTContext *nut){ - AVFormatContext *s= nut->avf; - ByteIOContext *bc = &s->pb; - uint64_t tmp, end; - int i, j, syncpoint_count; - int64_t filesize= url_fsize(bc); - int64_t *syncpoints; - int8_t *has_keyframe; - - url_fseek(bc, filesize-12, SEEK_SET); - url_fseek(bc, filesize-get_be64(bc), SEEK_SET); - if(get_be64(bc) != INDEX_STARTCODE){ - av_log(s, AV_LOG_ERROR, "no index at the end\n"); - return -1; - } - - end= get_packetheader(nut, bc, 1); - end += url_ftell(bc); - - get_v(bc); //max_pts - GET_V(syncpoint_count, tmp < INT_MAX/8 && tmp > 0) - syncpoints= av_malloc(sizeof(int64_t)*syncpoint_count); - 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= 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= get_v(bc); - if(!A){ - A= get_v(bc); - B= 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 %Ld > %Ld + %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 ^= 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= get_v(bc); -//FIXME check last_pts validity? - if(coded_pts < (1<<stc->msb_pts_shift)){ - *pts=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*get_v(bc); - } - if(flags&FLAG_RESERVED) - reserved_count= get_v(bc); - for(i=0; i<reserved_count; i++) - 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); - 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; -resync: - 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 %Ld %Ld\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, sp_pts_cmp, next_node); - av_log(s, AV_LOG_DEBUG, "%Ld-%Ld %Ld-%Ld\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, 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 doesnt matter - } - dummy.pos= pos; - sp= av_tree_find(nut->syncpoints, &dummy, 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 |