diff options
Diffstat (limited to 'contrib/ffmpeg/libavformat/nutdec.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/nutdec.c | 880 |
1 files changed, 880 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/nutdec.c b/contrib/ffmpeg/libavformat/nutdec.c new file mode 100644 index 000000000..e072e7ed7 --- /dev/null +++ b/contrib/ffmpeg/libavformat/nutdec.c @@ -0,0 +1,880 @@ +/* + * "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" +#include "avstring.h" + +#undef NDEBUG +#include <assert.h> + +static int get_str(ByteIOContext *bc, char *string, unsigned int maxlen){ + unsigned int len= ff_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 = ff_get_v(bc) + 1; + + if (v&1) return -(v>>1); + else return (v>>1); +} + +static uint64_t get_fourcc(ByteIOContext *bc){ + unsigned int len= ff_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= ff_get_v(bc); + + av_log(NULL, AV_LOG_DEBUG, "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); + + av_log(NULL, AV_LOG_DEBUG, "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); + + av_log(NULL, AV_LOG_DEBUG, "get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); + return v; +} +#define ff_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, uint64_t startcode) +{ + int64_t size; +// start= url_ftell(bc) - 8; + + startcode= be2me_64(startcode); + startcode= ff_crc04C11DB7_update(0, &startcode, 8); + + init_checksum(bc, ff_crc04C11DB7_update, startcode); + size= ff_get_v(bc); + if(size > 4096) + get_be32(bc); + if(get_checksum(bc) && size > 4096) + return -1; + + init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0); + + 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 is not seekable, but that should not 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 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= ff_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, tmp_head_idx; + int64_t tmp_match; + + end= get_packetheader(nut, bc, 1, MAIN_STARTCODE); + end += url_ftell(bc); + + GET_V(tmp , tmp >=2 && tmp <= 3) + GET_V(stream_count , tmp > 0 && tmp <=MAX_STREAMS) + + nut->max_distance = ff_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; + tmp_match= 1-(1LL<<62); + tmp_head_idx= 0; + for(i=0; i<256;){ + int tmp_flags = ff_get_v(bc); + int tmp_fields= ff_get_v(bc); + if(tmp_fields>0) tmp_pts = get_s(bc); + if(tmp_fields>1) tmp_mul = ff_get_v(bc); + if(tmp_fields>2) tmp_stream= ff_get_v(bc); + if(tmp_fields>3) tmp_size = ff_get_v(bc); + else tmp_size = 0; + if(tmp_fields>4) tmp_res = ff_get_v(bc); + else tmp_res = 0; + if(tmp_fields>5) count = ff_get_v(bc); + else count = tmp_mul - tmp_size; + if(tmp_fields>6) tmp_match = get_s(bc); + if(tmp_fields>7) tmp_head_idx= ff_get_v(bc); + + while(tmp_fields-- > 8) + ff_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 ; + nut->frame_code[i].header_idx = tmp_head_idx; + } + } + assert(nut->frame_code['N'].flags == FLAG_INVALID); + + if(end > url_ftell(bc) + 4){ + int rem= 1024; + GET_V(nut->header_count, tmp<128U) + nut->header_count++; + for(i=1; i<nut->header_count; i++){ + GET_V(nut->header_len[i], tmp>0 && tmp<256); + rem -= nut->header_len[i]; + if(rem < 0){ + av_log(s, AV_LOG_ERROR, "invalid elision header\n"); + return -1; + } + nut->header[i]= av_malloc(nut->header_len[i]); + get_buffer(bc, nut->header[i], nut->header_len[i]); + } + assert(nut->header_len[0]==0); + } + + 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, STREAM_STARTCODE); + end += url_ftell(bc); + + GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base); + stc= &nut->stream[stream_id]; + + st = s->streams[stream_id]; + if (!st) + return AVERROR(ENOMEM); + + class = ff_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_id(codec_bmp_tags, 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_id(codec_wav_tags, 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= ff_get_v(bc); + GET_V(stc->decode_delay , tmp < 1000); //sanity limit, raise this if Moore's law is true + st->codec->has_b_frames= stc->decode_delay; + ff_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= ff_get_v(bc); + st->codec->sample_aspect_ratio.den= ff_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 %d/%d\n", st->codec->sample_aspect_ratio.num, st->codec->sample_aspect_ratio.den); + return -1; + } + ff_get_v(bc); /* csp type */ + }else if (st->codec->codec_type == CODEC_TYPE_AUDIO){ + GET_V(st->codec->sample_rate , tmp > 0) + ff_get_v(bc); // samplerate_den + 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]; + const char *type; + + end= get_packetheader(nut, bc, 1, INFO_STARTCODE); + end += url_ftell(bc); + + GET_V(stream_id_plus1, tmp <= s->nb_streams) + chapter_id = get_s(bc); + chapter_start= ff_get_v(bc); + chapter_len = ff_get_v(bc); + count = ff_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_str, sizeof(type_str)); + type= type_str; + 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= ff_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")) + av_strlcpy(s->author , str_value, sizeof(s->author)); + else if(!strcmp(name, "Title")) + av_strlcpy(s->title , str_value, sizeof(s->title)); + else if(!strcmp(name, "Copyright")) + av_strlcpy(s->copyright, str_value, sizeof(s->copyright)); + else if(!strcmp(name, "Description")) + av_strlcpy(s->comment , str_value, sizeof(s->comment)); + } + } + + if(skip_reserved(bc, end) || get_checksum(bc)){ + av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n"); + return -1; + } + return 0; +} + +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; + + nut->last_syncpoint_pos= url_ftell(bc)-8; + + end= get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE); + end += url_ftell(bc); + + tmp= ff_get_v(bc); + *back_ptr= nut->last_syncpoint_pos - 16*ff_get_v(bc); + if(*back_ptr < 0) + return -1; + + ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count], tmp / nut->time_base_count); + + 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; + ff_nut_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, INDEX_STARTCODE); + end += url_ftell(bc); + + ff_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= 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<syncpoint_count; 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 initialized_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(initialized_stream_count=0; initialized_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) + initialized_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, uint8_t *header_idx, 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; + *header_idx = nut->frame_code[frame_code].header_idx; + + 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_MATCH_TIME) + get_s(bc); + if(flags&FLAG_HEADER_IDX) + *header_idx= 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(*header_idx >= (unsigned)nut->header_count){ + av_log(s, AV_LOG_ERROR, "header_idx invalid\n"); + return -1; + } + if(size > 4096) + *header_idx=0; + size -= nut->header_len[*header_idx]; + + 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; + uint8_t header_idx; + + size= decode_frame_header(nut, &pts, &stream_id, &header_idx, 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_new_packet(pkt, size + nut->header_len[header_idx]); + memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]); + pkt->pos= url_ftell(bc); //FIXME + get_buffer(bc, pkt->data + nut->header_len[header_idx], 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 |