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- /*
- * "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/dict.h"
- #include "libavutil/mathematics.h"
- #include "libavutil/tree.h"
- #include "avio_internal.h"
- #include "nut.h"
- #undef NDEBUG
- #include <assert.h>
- #if FF_API_MAX_STREAMS
- #define NUT_MAX_STREAMS MAX_STREAMS
- #else
- #define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */
- #endif
- static int get_str(AVIOContext *bc, char *string, unsigned int maxlen){
- unsigned int len= ffio_read_varlen(bc);
- if(len && maxlen)
- avio_read(bc, string, FFMIN(len, maxlen));
- while(len > maxlen){
- avio_r8(bc);
- len--;
- }
- if(maxlen)
- string[FFMIN(len, maxlen-1)]= 0;
- if(maxlen == len)
- return -1;
- else
- return 0;
- }
- static int64_t get_s(AVIOContext *bc){
- int64_t v = ffio_read_varlen(bc) + 1;
- if (v&1) return -(v>>1);
- else return (v>>1);
- }
- static uint64_t get_fourcc(AVIOContext *bc){
- unsigned int len= ffio_read_varlen(bc);
- if (len==2) return avio_rl16(bc);
- else if(len==4) return avio_rl32(bc);
- else return -1;
- }
- #ifdef TRACE
- static inline uint64_t get_v_trace(AVIOContext *bc, char *file, char *func, int line){
- uint64_t v= ffio_read_varlen(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(AVIOContext *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(AVIOContext *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 ffio_read_varlen(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, AVIOContext *bc, int calculate_checksum, uint64_t startcode)
- {
- int64_t size;
- // start= avio_tell(bc) - 8;
- startcode= av_be2ne64(startcode);
- startcode= ff_crc04C11DB7_update(0, (uint8_t*)&startcode, 8);
- ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);
- size= ffio_read_varlen(bc);
- if(size > 4096)
- avio_rb32(bc);
- if(ffio_get_checksum(bc) && size > 4096)
- return -1;
- ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
- return size;
- }
- static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos){
- uint64_t state=0;
- if(pos >= 0)
- avio_seek(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) | avio_r8(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
- * @return the position of the startcode or -1 if not found
- */
- static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos){
- for(;;){
- uint64_t startcode= find_any_startcode(bc, pos);
- if(startcode == code)
- return avio_tell(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= ffio_read_varlen(bc);\
- if(!(check)){\
- av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp);\
- return -1;\
- }\
- dst= tmp;
- static int skip_reserved(AVIOContext *bc, int64_t pos){
- pos -= avio_tell(bc);
- if(pos<0){
- avio_seek(bc, pos, SEEK_CUR);
- return -1;
- }else{
- while(pos--)
- avio_r8(bc);
- return 0;
- }
- }
- static int decode_main_header(NUTContext *nut){
- AVFormatContext *s= nut->avf;
- AVIOContext *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;
- end= get_packetheader(nut, bc, 1, MAIN_STARTCODE);
- end += avio_tell(bc);
- GET_V(tmp , tmp >=2 && tmp <= 3)
- GET_V(stream_count , tmp > 0 && tmp <= NUT_MAX_STREAMS)
- nut->max_distance = ffio_read_varlen(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 AVERROR_INVALIDDATA;
- }
- }
- tmp_pts=0;
- tmp_mul=1;
- tmp_stream=0;
- tmp_head_idx= 0;
- for(i=0; i<256;){
- int tmp_flags = ffio_read_varlen(bc);
- int tmp_fields= ffio_read_varlen(bc);
- if(tmp_fields>0) tmp_pts = get_s(bc);
- if(tmp_fields>1) tmp_mul = ffio_read_varlen(bc);
- if(tmp_fields>2) tmp_stream= ffio_read_varlen(bc);
- if(tmp_fields>3) tmp_size = ffio_read_varlen(bc);
- else tmp_size = 0;
- if(tmp_fields>4) tmp_res = ffio_read_varlen(bc);
- else tmp_res = 0;
- if(tmp_fields>5) count = ffio_read_varlen(bc);
- else count = tmp_mul - tmp_size;
- if(tmp_fields>6) get_s(bc);
- if(tmp_fields>7) tmp_head_idx= ffio_read_varlen(bc);
- while(tmp_fields-- > 8)
- ffio_read_varlen(bc);
- if(count == 0 || i+count > 256){
- av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
- return AVERROR_INVALIDDATA;
- }
- if(tmp_stream >= stream_count){
- av_log(s, AV_LOG_ERROR, "illegal stream number\n");
- return AVERROR_INVALIDDATA;
- }
- 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 > avio_tell(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 AVERROR_INVALIDDATA;
- }
- nut->header[i]= av_malloc(nut->header_len[i]);
- avio_read(bc, nut->header[i], nut->header_len[i]);
- }
- assert(nut->header_len[0]==0);
- }
- if(skip_reserved(bc, end) || ffio_get_checksum(bc)){
- av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
- return AVERROR_INVALIDDATA;
- }
- 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;
- AVIOContext *bc = s->pb;
- StreamContext *stc;
- int class, stream_id;
- uint64_t tmp, end;
- AVStream *st;
- end= get_packetheader(nut, bc, 1, STREAM_STARTCODE);
- end += avio_tell(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 = ffio_read_varlen(bc);
- tmp = get_fourcc(bc);
- st->codec->codec_tag= tmp;
- switch(class)
- {
- case 0:
- st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- st->codec->codec_id = av_codec_get_id(
- (const AVCodecTag * const []) { ff_codec_bmp_tags, ff_nut_video_tags, 0 },
- tmp);
- break;
- case 1:
- st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- st->codec->codec_id = ff_codec_get_id(ff_codec_wav_tags, tmp);
- break;
- case 2:
- st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
- st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
- break;
- case 3:
- st->codec->codec_type = AVMEDIA_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 tag '0x%04x' for stream number %d\n",
- (unsigned int)tmp, stream_id);
- GET_V(stc->time_base_id , tmp < nut->time_base_count);
- GET_V(stc->msb_pts_shift , tmp < 16);
- stc->max_pts_distance= ffio_read_varlen(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;
- ffio_read_varlen(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);
- avio_read(bc, st->codec->extradata, st->codec->extradata_size);
- }
- if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO){
- GET_V(st->codec->width , tmp > 0)
- GET_V(st->codec->height, tmp > 0)
- st->sample_aspect_ratio.num= ffio_read_varlen(bc);
- st->sample_aspect_ratio.den= ffio_read_varlen(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;
- }
- ffio_read_varlen(bc); /* csp type */
- }else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO){
- GET_V(st->codec->sample_rate , tmp > 0)
- ffio_read_varlen(bc); // samplerate_den
- GET_V(st->codec->channels, tmp > 0)
- }
- if(skip_reserved(bc, end) || ffio_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;
- AVIOContext *bc = s->pb;
- uint64_t tmp, chapter_start, chapter_len;
- unsigned int stream_id_plus1, 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;
- AVDictionary **metadata = NULL;
- end= get_packetheader(nut, bc, 1, INFO_STARTCODE);
- end += avio_tell(bc);
- GET_V(stream_id_plus1, tmp <= s->nb_streams)
- chapter_id = get_s(bc);
- chapter_start= ffio_read_varlen(bc);
- chapter_len = ffio_read_varlen(bc);
- count = ffio_read_varlen(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);
- metadata = &chapter->metadata;
- } else if(stream_id_plus1) {
- st= s->streams[stream_id_plus1 - 1];
- metadata = &st->metadata;
- } else
- metadata = &s->metadata;
- 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= ffio_read_varlen(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")){
- if(chapter_id==0 && !strcmp(name, "Disposition")) {
- set_disposition_bits(s, str_value, stream_id_plus1 - 1);
- continue;
- }
- if(metadata && strcasecmp(name,"Uses")
- && strcasecmp(name,"Depends") && strcasecmp(name,"Replaces"))
- av_dict_set(metadata, name, str_value, 0);
- }
- }
- if(skip_reserved(bc, end) || ffio_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;
- AVIOContext *bc = s->pb;
- int64_t end, tmp;
- nut->last_syncpoint_pos= avio_tell(bc)-8;
- end= get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
- end += avio_tell(bc);
- tmp= ffio_read_varlen(bc);
- *back_ptr= nut->last_syncpoint_pos - 16*ffio_read_varlen(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) || ffio_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;
- AVIOContext *bc = s->pb;
- uint64_t tmp, end;
- int i, j, syncpoint_count;
- int64_t filesize= avio_size(bc);
- int64_t *syncpoints;
- int8_t *has_keyframe;
- int ret= -1;
- avio_seek(bc, filesize-12, SEEK_SET);
- avio_seek(bc, filesize-avio_rb64(bc), SEEK_SET);
- if(avio_rb64(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 += avio_tell(bc);
- ffio_read_varlen(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] = ffio_read_varlen(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= ffio_read_varlen(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= ffio_read_varlen(bc);
- if(!A){
- A= ffio_read_varlen(bc);
- B= ffio_read_varlen(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) || ffio_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;
- AVIOContext *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 AVERROR_INVALIDDATA;
- }
- }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 AVERROR_INVALIDDATA;
- }
- if(decode_stream_header(nut) >= 0)
- initialized_stream_count++;
- }
- /* info headers */
- pos=0;
- for(;;){
- uint64_t startcode= find_any_startcode(bc, pos);
- pos= avio_tell(bc);
- if(startcode==0){
- av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
- return AVERROR_INVALIDDATA;
- }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(bc->seekable){
- int64_t orig_pos= avio_tell(bc);
- find_and_decode_index(nut);
- avio_seek(bc, orig_pos, SEEK_SET);
- }
- assert(nut->next_startcode == SYNCPOINT_STARTCODE);
- ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
- 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;
- AVIOContext *bc = s->pb;
- StreamContext *stc;
- int size, flags, size_mul, pts_delta, i, reserved_count;
- uint64_t tmp;
- if(avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance){
- av_log(s, AV_LOG_ERROR, "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n", avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
- return AVERROR_INVALIDDATA;
- }
- 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 AVERROR_INVALIDDATA;
- if(flags & FLAG_CODED)
- flags ^= ffio_read_varlen(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= ffio_read_varlen(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*ffio_read_varlen(bc);
- }
- if(flags&FLAG_MATCH_TIME)
- get_s(bc);
- if(flags&FLAG_HEADER_IDX)
- *header_idx= ffio_read_varlen(bc);
- if(flags&FLAG_RESERVED)
- reserved_count= ffio_read_varlen(bc);
- for(i=0; i<reserved_count; i++)
- ffio_read_varlen(bc);
- if(*header_idx >= (unsigned)nut->header_count){
- av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
- return AVERROR_INVALIDDATA;
- }
- if(size > 4096)
- *header_idx=0;
- size -= nut->header_len[*header_idx];
- if(flags&FLAG_CHECKSUM){
- avio_rb32(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 AVERROR_INVALIDDATA;
- }
- 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;
- AVIOContext *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 size;
- 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){
- avio_skip(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= avio_tell(bc); //FIXME
- avio_read(bc, pkt->data + nut->header_len[header_idx], size);
- pkt->stream_index = stream_id;
- if (stc->last_flags & FLAG_KEY)
- pkt->flags |= AV_PKT_FLAG_KEY;
- pkt->pts = pts;
- return 0;
- }
- static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
- {
- NUTContext *nut = s->priv_data;
- AVIOContext *bc = s->pb;
- int i, frame_code=0, ret, skip;
- int64_t ts, back_ptr;
- for(;;){
- int64_t pos= avio_tell(bc);
- uint64_t tmp= nut->next_startcode;
- nut->next_startcode=0;
- if(tmp){
- pos-=8;
- }else{
- frame_code = avio_r8(bc);
- if(url_feof(bc))
- return -1;
- if(frame_code == 'N'){
- tmp= frame_code;
- for(i=1; i<8; i++)
- tmp = (tmp<<8) + avio_r8(bc);
- }
- }
- switch(tmp){
- case MAIN_STARTCODE:
- case STREAM_STARTCODE:
- case INDEX_STARTCODE:
- skip= get_packetheader(nut, bc, 0, tmp);
- avio_skip(bc, skip);
- 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 = avio_r8(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 AVERROR_INVALIDDATA;
- 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;
- AVIOContext *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, (void *) ff_nut_sp_pts_cmp,
- (void **) 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, (void *) ff_nut_sp_pos_cmp,
- (void **) 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, (void *) 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);
- avio_seek(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;
- int i;
- av_freep(&nut->time_base);
- av_freep(&nut->stream);
- ff_nut_free_sp(nut);
- for(i = 1; i < nut->header_count; i++)
- av_freep(&nut->header[i]);
- return 0;
- }
- #if CONFIG_NUT_DEMUXER
- AVInputFormat ff_nut_demuxer = {
- .name = "nut",
- .long_name = NULL_IF_CONFIG_SMALL("NUT format"),
- .priv_data_size = sizeof(NUTContext),
- .read_probe = nut_probe,
- .read_header = nut_read_header,
- .read_packet = nut_read_packet,
- .read_close = nut_read_close,
- .read_seek = read_seek,
- .extensions = "nut",
- .codec_tag = (const AVCodecTag * const []) { ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 },
- };
- #endif
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