| /* |
| * "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 <strings.h> |
| #include "libavutil/avstring.h" |
| #include "libavutil/bswap.h" |
| #include "libavutil/tree.h" |
| #include "nut.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 currently are |
| |
| 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(av_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); |
| break; |
| case 1: |
| st->codec->codec_type = CODEC_TYPE_AUDIO; |
| st->codec->codec_id = codec_get_id(codec_wav_tags, tmp); |
| break; |
| case 2: |
| st->codec->codec_type = CODEC_TYPE_SUBTITLE; |
| st->codec->codec_id = codec_get_id(ff_nut_subtitle_tags, tmp); |
| 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; |
| } |
| if(class<3 && st->codec->codec_id == CODEC_ID_NONE) |
| av_log(s, AV_LOG_ERROR, "Unknown codec?!\n"); |
| |
| 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->sample_aspect_ratio.num= ff_get_v(bc); |
| st->sample_aspect_ratio.den= ff_get_v(bc); |
| if((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)){ |
| av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n", st->sample_aspect_ratio.num, st->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 void set_disposition_bits(AVFormatContext* avf, char* value, int stream_id){ |
| int flag = 0, i; |
| for (i=0; ff_nut_dispositions[i].flag; ++i) { |
| if (!strcmp(ff_nut_dispositions[i].str, value)) |
| flag = ff_nut_dispositions[i].flag; |
| } |
| if (!flag) |
| av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value); |
| for (i = 0; i < avf->nb_streams; ++i) |
| if (stream_id == i || stream_id == -1) |
| avf->streams[i]->disposition |= flag; |
| } |
| |
| 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; |
| AVChapter *chapter= NULL; |
| AVStream *st= NULL; |
| |
| 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); |
| |
| if(chapter_id && !stream_id_plus1){ |
| int64_t start= chapter_start / nut->time_base_count; |
| chapter= ff_new_chapter(s, chapter_id, |
| nut->time_base[chapter_start % nut->time_base_count], |
| start, start + chapter_len, NULL); |
| } else if(stream_id_plus1) |
| st= s->streams[stream_id_plus1 - 1]; |
| |
| 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 (stream_id_plus1 > s->nb_streams) { |
| av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n"); |
| continue; |
| } |
| |
| if(!strcmp(type, "UTF-8")){ |
| AVMetadata **metadata = NULL; |
| if(chapter_id==0 && !strcmp(name, "Disposition")) |
| set_disposition_bits(s, str_value, stream_id_plus1 - 1); |
| else if(chapter) metadata= &chapter->metadata; |
| else if(stream_id_plus1) metadata= &st->metadata; |
| else metadata= &s->metadata; |
| if(metadata && strcasecmp(name,"Uses") |
| && strcasecmp(name,"Depends") && strcasecmp(name,"Replaces")) |
| av_metadata_set(metadata, name, 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; |
| } |
| |
| 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; |
| int ret= -1; |
| |
| 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++){ |
| syncpoints[i] = ff_get_v(bc); |
| if(syncpoints[i] <= 0) |
| goto fail; |
| 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"); |
| goto fail; |
| } |
| 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"); |
| goto fail; |
| } |
| has_keyframe[n++]= x&1; |
| x>>=1; |
| } |
| } |
| if(has_keyframe[0]){ |
| av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n"); |
| goto fail; |
| } |
| 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"); |
| goto fail; |
| } |
| ret= 0; |
| fail: |
| av_free(syncpoints); |
| av_free(has_keyframe); |
| return ret; |
| } |
| |
| 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 dummy={.ts= pts*av_q2d(st->time_base)*AV_TIME_BASE}; |
| Syncpoint nopts_sp= {.ts= AV_NOPTS_VALUE, .back_ptr= AV_NOPTS_VALUE}; |
| Syncpoint *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; |
| } |
| |
| #if CONFIG_NUT_DEMUXER |
| AVInputFormat nut_demuxer = { |
| "nut", |
| NULL_IF_CONFIG_SMALL("NUT format"), |
| sizeof(NUTContext), |
| nut_probe, |
| nut_read_header, |
| nut_read_packet, |
| nut_read_close, |
| read_seek, |
| .extensions = "nut", |
| }; |
| #endif |
