--- /dev/null
+/*
+ * "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 "nut.h"
+
+#undef NDEBUG
+#include <assert.h>
+
+static uint64_t get_v(ByteIOContext *bc/*, maxstuffing*/){
+ uint64_t val = 0;
+
+ for(;;)
+ {
+ int tmp = get_byte(bc);
+
+// if(tmp=0x80){
+// if(!maxstuffing-- || val)
+// return -1;
+// }
+
+ if (tmp&0x80)
+ val= (val<<7) + tmp - 0x80;
+ else{
+ return (val<<7) + tmp;
+ }
+ }
+ return -1;
+}
+
+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);
+
+ init_checksum(bc, calculate_checksum ? av_crc04C11DB7_update : NULL, 1);
+
+// nut->packet_start[2] = start;
+// nut->written_packet_size= size;
+
+ return size;
+}
+
+static int check_checksum(ByteIOContext *bc){
+ unsigned long checksum= get_checksum(bc);
+// return checksum != get_be32(bc);
+
+ av_log(NULL, AV_LOG_ERROR, "%08X %08X\n", checksum, (int)get_be32(bc));
+
+ return 0;
+}
+
+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) - 4;
+
+ 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) || check_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, nom, denom, stream_id;
+ uint64_t tmp, end;
+ AVStream *st;
+
+ end= get_packetheader(nut, bc, 1);
+ end += url_ftell(bc) - 4;
+
+ 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) || check_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) - 4;
+
+ 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) || check_checksum(bc)){
+ av_log(s, AV_LOG_ERROR, "Info header checksum mismatch\n");
+ return -1;
+ }
+ return 0;
+}
+
+static int decode_syncpoint(NUTContext *nut){
+ AVFormatContext *s= nut->avf;
+ ByteIOContext *bc = &s->pb;
+ int64_t end;
+ uint64_t tmp;
+ int i;
+ AVRational time_base;
+
+ nut->last_syncpoint_pos= url_ftell(bc);
+
+ end= get_packetheader(nut, bc, 1);
+ end += url_ftell(bc) - 4;
+
+ tmp= get_v(bc);
+ get_v(bc); //back_ptr_div16
+
+ 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_q(tmp / nut->time_base_count, time_base, nut->stream[i].time_base); //FIXME rounding and co
+ //last_key_frame ?
+ }
+ //FIXME put this in a reset func maybe
+
+ if(skip_reserved(bc, end) || check_checksum(bc)){
+ av_log(s, AV_LOG_ERROR, "Info header 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;
+ for(;;){
+ 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;
+ }
+ if(decode_main_header(nut) >= 0)
+ break;
+ }
+
+ /* 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);
+ }
+
+ return 0;
+}
+
+static int decode_frame_header(NUTContext *nut, int *flags_ret, 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\n");
+ 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
+ }
+ *flags_ret= flags;
+
+ stc->last_pts= *pts;
+ stc->last_key_frame= flags&FLAG_KEY; //FIXME change to last 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, flags, discard;
+ int64_t pts, last_IP_pts;
+
+ size= decode_frame_header(nut, &flags, &pts, &stream_id, frame_code);
+ if(size < 0)
+ return -1;
+
+ discard= s->streams[ stream_id ]->discard;
+ last_IP_pts= s->streams[ stream_id ]->last_IP_pts;
+ if( (discard >= AVDISCARD_NONKEY && !(flags & FLAG_KEY))
+ ||(discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE && last_IP_pts > pts)
+ || discard >= AVDISCARD_ALL){
+ url_fskip(bc, size);
+ return 1;
+ }
+
+ av_get_packet(bc, pkt, size);
+ pkt->stream_index = stream_id;
+ if (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;
+
+ for(;;){
+ int64_t pos= url_ftell(bc);
+ uint64_t tmp= nut->next_startcode;
+ nut->next_startcode=0;
+
+ if (url_feof(bc))
+ return -1;
+
+ if(tmp){
+ pos-=8;
+ }else{
+ frame_code = get_byte(bc);
+ 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)<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, pos+1);
+ if(tmp==0)
+ return -1;
+av_log(s, AV_LOG_DEBUG, "sync\n");
+ nut->next_startcode= tmp;
+ }
+ }
+}
+
+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,
+ NULL,
+ NULL,
+ .extensions = "nut",
+};
+#endif
projects / platform / upstream / libav.git / commitdiff