diff options
| -rw-r--r-- | libavformat/Makefile | 4 | ||||
| -rw-r--r-- | libavformat/allformats.c | 2 | ||||
| -rw-r--r-- | libavformat/nut.h | 94 | ||||
| -rw-r--r-- | libavformat/nutdec.c | 691 |
4 files changed, 788 insertions, 3 deletions
diff --git a/libavformat/Makefile b/libavformat/Makefile index 2f3ef01081..0bff900e11 100644 --- a/libavformat/Makefile +++ b/libavformat/Makefile @@ -73,8 +73,8 @@ OBJS-$(CONFIG_MPEGTS_MUXER) += mpegtsenc.o OBJS-$(CONFIG_MPJPEG_MUXER) += mpjpeg.o OBJS-$(CONFIG_MXF_DEMUXER) += mxf.o OBJS-$(CONFIG_NSV_DEMUXER) += nsvdec.o riff.o -OBJS-$(CONFIG_NUT_DEMUXER) += nut.o riff.o -OBJS-$(CONFIG_NUT_MUXER) += nut.o riff.o +OBJS-$(CONFIG_NUT_DEMUXER) += nutdec.o riff.o +#OBJS-$(CONFIG_NUT_MUXER) += nutenc.o riff.o OBJS-$(CONFIG_NUV_DEMUXER) += nuv.o riff.o OBJS-$(CONFIG_OGG_DEMUXER) += ogg2.o \ oggparsevorbis.o \ diff --git a/libavformat/allformats.c b/libavformat/allformats.c index 5536ea9e6b..aad7435ae8 100644 --- a/libavformat/allformats.c +++ b/libavformat/allformats.c @@ -249,7 +249,7 @@ void av_register_all(void) av_register_input_format(&nut_demuxer); #endif #ifdef CONFIG_NUT_MUXER - av_register_output_format(&nut_muxer); +// av_register_output_format(&nut_muxer); #endif #ifdef CONFIG_NUV_DEMUXER av_register_input_format(&nuv_demuxer); diff --git a/libavformat/nut.h b/libavformat/nut.h new file mode 100644 index 0000000000..af42a57720 --- /dev/null +++ b/libavformat/nut.h @@ -0,0 +1,94 @@ +/* + * "NUT" Container Format (de)muxer + * Copyright (c) 2006 Michael Niedermayer + * + * 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 <limits.h> +#include "avformat.h" +#include "crc.h" +//#include "mpegaudio.h" +#include "riff.h" +//#include "adler32.h" + +#define MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48)) +#define STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48)) +#define SYNCPOINT_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48)) +#define INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48)) +#define INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48)) + +#define ID_STRING "nut/multimedia container\0" + +#define MAX_DISTANCE (1024*32-1) + +typedef enum{ + FLAG_KEY = 1, ///<if set, frame is keyframe + FLAG_EOR = 2, ///<if set, stream has no relevance on presentation. (EOR) + FLAG_CODED_PTS = 8, ///<if set, coded_pts is in the frame header + FLAG_STREAM_ID = 16, ///<if set, stream_id is coded in the frame header + FLAG_SIZE_MSB = 32, ///<if set, data_size_msb is at frame header, otherwise data_size_msb is 0 + FLAG_CHECKSUM = 64, ///<if set then the frame header contains a checksum + FLAG_RESERVED = 128, ///<if set, reserved_count is coded in the frame header + FLAG_CODED =4096, ///<if set, coded_flags are stored in the frame header. + FLAG_INVALID =8192, ///<if set, frame_code is invalid. +}flag_t; + +typedef struct { + uint32_t pos; //64gb limit if div16 (change this to 64 if thats too little) + uint64_t global_key_pts; + uint32_t back_ptr_div16; //is stored /16 +} syncpoint_t; + +typedef struct { + uint16_t flags; + uint8_t stream_id; + uint16_t size_mul; + uint16_t size_lsb; + int16_t pts_delta; + uint8_t reserved_count; +} FrameCode; // maybe s/FrameCode/framecode_t/ or change all to java style but dont mix + +typedef struct { + int last_key_frame; ///<was the last frame a keyfraeme + int64_t last_pts; + int time_base_id; + AVRational time_base; + int msb_pts_shift; + int max_pts_distance; + int decode_delay; //FIXME duplicate of has_b_frames +} StreamContext;// maybe s/StreamContext/streamcontext_t/ + +typedef struct { + AVFormatContext *avf; +// int written_packet_size; +// int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes + FrameCode frame_code[256]; + uint64_t next_startcode; ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable + StreamContext *stream; + unsigned int max_distance; + unsigned int time_base_count; + int64_t last_syncpoint_pos; + AVRational *time_base; +} NUTContext; + + +//FIXME move to a common spot, like crc.c/h +static unsigned long av_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){ + return av_crc(av_crc04C11DB7, checksum, buf, len); +} diff --git a/libavformat/nutdec.c b/libavformat/nutdec.c new file mode 100644 index 0000000000..5a3caabe89 --- /dev/null +++ b/libavformat/nutdec.c @@ -0,0 +1,691 @@ +/* + * "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 |