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Diffstat (limited to 'contrib/ffmpeg/libavformat/nut.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/nut.c | 1457 |
1 files changed, 1457 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/nut.c b/contrib/ffmpeg/libavformat/nut.c new file mode 100644 index 000000000..df64caf15 --- /dev/null +++ b/contrib/ffmpeg/libavformat/nut.c @@ -0,0 +1,1457 @@ +/* + * "NUT" Container Format muxer and demuxer (DRAFT-200403??) + * Copyright (c) 2003 Alex Beregszaszi + * Copyright (c) 2004 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 + * + * + * Visit the official site at http://www.nut.hu/ + * + */ + +/* + * TODO: + * - index writing + * - index packet reading support +*/ + +//#define DEBUG 1 + +#include <limits.h> +#include "avformat.h" +#include "mpegaudio.h" +#include "riff.h" +#include "adler32.h" + +#undef NDEBUG +#include <assert.h> + +//#define TRACE + +//from /dev/random + +#define MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48)) +#define STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48)) +#define KEYFRAME_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*16-1) +#define MAX_SHORT_DISTANCE (1024*4-1) + +#define FLAG_DATA_SIZE 1 +#define FLAG_KEY_FRAME 2 +#define FLAG_INVALID 4 + +typedef struct { + uint8_t flags; + uint8_t stream_id_plus1; + uint16_t size_mul; + uint16_t size_lsb; + int16_t timestamp_delta; + uint8_t reserved_count; +} FrameCode; + +typedef struct { + int last_key_frame; + int msb_timestamp_shift; + int rate_num; + int rate_den; + int64_t last_pts; + int64_t last_sync_pos; ///<pos of last 1/2 type frame + int decode_delay; +} StreamContext; + +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]; + unsigned int stream_count; + uint64_t next_startcode; ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable + StreamContext *stream; + int max_distance; + int max_short_distance; + int rate_num; + int rate_den; + int short_startcode; +} NUTContext; + +static char *info_table[][2]={ + {NULL , NULL }, // end + {NULL , NULL }, + {NULL , "UTF8"}, + {NULL , "v"}, + {NULL , "s"}, + {"StreamId" , "v"}, + {"SegmentId" , "v"}, + {"StartTimestamp" , "v"}, + {"EndTimestamp" , "v"}, + {"Author" , "UTF8"}, + {"Title" , "UTF8"}, + {"Description" , "UTF8"}, + {"Copyright" , "UTF8"}, + {"Encoder" , "UTF8"}, + {"Keyword" , "UTF8"}, + {"Cover" , "JPEG"}, + {"Cover" , "PNG"}, +}; + +static void update(NUTContext *nut, int stream_index, int64_t frame_start, int frame_type, int frame_code, int key_frame, int size, int64_t pts){ + StreamContext *stream= &nut->stream[stream_index]; + + stream->last_key_frame= key_frame; + nut->packet_start[ frame_type ]= frame_start; + stream->last_pts= pts; +} + +static void reset(AVFormatContext *s, int64_t global_ts){ + NUTContext *nut = s->priv_data; + int i; + + for(i=0; i<s->nb_streams; i++){ + StreamContext *stream= &nut->stream[i]; + + stream->last_key_frame= 1; + + stream->last_pts= av_rescale(global_ts, stream->rate_num*(int64_t)nut->rate_den, stream->rate_den*(int64_t)nut->rate_num); + } +} + +static void build_frame_code(AVFormatContext *s){ + NUTContext *nut = s->priv_data; + int key_frame, index, pred, stream_id; + int start=0; + int end= 255; + int keyframe_0_esc= s->nb_streams > 2; + int pred_table[10]; + + if(keyframe_0_esc){ + /* keyframe = 0 escape */ + FrameCode *ft= &nut->frame_code[start]; + ft->flags= FLAG_DATA_SIZE; + ft->stream_id_plus1= 0; + ft->size_mul=1; + ft->timestamp_delta=0; + start++; + } + + for(stream_id= 0; stream_id<s->nb_streams; stream_id++){ + int start2= start + (end-start)*stream_id / s->nb_streams; + int end2 = start + (end-start)*(stream_id+1) / s->nb_streams; + AVCodecContext *codec = s->streams[stream_id]->codec; + int is_audio= codec->codec_type == CODEC_TYPE_AUDIO; + int intra_only= /*codec->intra_only || */is_audio; + int pred_count; + + for(key_frame=0; key_frame<2; key_frame++){ + if(intra_only && keyframe_0_esc && key_frame==0) + continue; + + { + FrameCode *ft= &nut->frame_code[start2]; + ft->flags= FLAG_KEY_FRAME*key_frame; + ft->flags|= FLAG_DATA_SIZE; + ft->stream_id_plus1= stream_id + 1; + ft->size_mul=1; + ft->timestamp_delta=0; + start2++; + } + } + + key_frame= intra_only; +#if 1 + if(is_audio){ + int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate); + int pts; + for(pts=0; pts<2; pts++){ + for(pred=0; pred<2; pred++){ + FrameCode *ft= &nut->frame_code[start2]; + ft->flags= FLAG_KEY_FRAME*key_frame; + ft->stream_id_plus1= stream_id + 1; + ft->size_mul=frame_bytes + 2; + ft->size_lsb=frame_bytes + pred; + ft->timestamp_delta=pts; + start2++; + } + } + }else{ + FrameCode *ft= &nut->frame_code[start2]; + ft->flags= FLAG_KEY_FRAME | FLAG_DATA_SIZE; + ft->stream_id_plus1= stream_id + 1; + ft->size_mul=1; + ft->timestamp_delta=1; + start2++; + } +#endif + + if(codec->has_b_frames){ + pred_count=5; + pred_table[0]=-2; + pred_table[1]=-1; + pred_table[2]=1; + pred_table[3]=3; + pred_table[4]=4; + }else if(codec->codec_id == CODEC_ID_VORBIS){ + pred_count=3; + pred_table[0]=2; + pred_table[1]=9; + pred_table[2]=16; + }else{ + pred_count=1; + pred_table[0]=1; + } + + for(pred=0; pred<pred_count; pred++){ + int start3= start2 + (end2-start2)*pred / pred_count; + int end3 = start2 + (end2-start2)*(pred+1) / pred_count; + + for(index=start3; index<end3; index++){ + FrameCode *ft= &nut->frame_code[index]; + ft->flags= FLAG_KEY_FRAME*key_frame; + ft->flags|= FLAG_DATA_SIZE; + ft->stream_id_plus1= stream_id + 1; +//FIXME use single byte size and pred from last + ft->size_mul= end3-start3; + ft->size_lsb= index - start3; + ft->timestamp_delta= pred_table[pred]; + } + } + } + memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N')); + nut->frame_code['N'].flags= FLAG_INVALID; +} + +static uint64_t get_v(ByteIOContext *bc) +{ + uint64_t val = 0; + + for(;;) + { + int tmp = get_byte(bc); + + if (tmp&0x80) + val= (val<<7) + tmp - 0x80; + else{ +//av_log(NULL, AV_LOG_DEBUG, "get_v()= %"PRId64"\n", (val<<7) + tmp); + 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_vb(ByteIOContext *bc){ + uint64_t val=0; + unsigned int i= get_v(bc); + + if(i>8) + return UINT64_MAX; + + while(i--) + val = (val<<8) + get_byte(bc); + +//av_log(NULL, AV_LOG_DEBUG, "get_vb()= %"PRId64"\n", val); + return val; +} + +#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_adler32_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); +} + +/** + * + */ +static int get_length(uint64_t val){ + int i; + + for (i=7; val>>i; i+=7); + + return i; +} + +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 KEYFRAME_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_timestamp_shift)-1; + int64_t delta= stream->last_pts - mask/2; + return ((lsb - delta)&mask) + delta; +} + +#ifdef CONFIG_MUXERS + +static void put_v(ByteIOContext *bc, uint64_t val) +{ + int i; + +//av_log(NULL, AV_LOG_DEBUG, "put_v()= %"PRId64"\n", val); + val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently + i= get_length(val); + + for (i-=7; i>0; i-=7){ + put_byte(bc, 0x80 | (val>>i)); + } + + put_byte(bc, val&0x7f); +} + +/** + * stores a string as vb. + */ +static void put_str(ByteIOContext *bc, const char *string){ + int len= strlen(string); + + put_v(bc, len); + put_buffer(bc, string, len); +} + +static void put_s(ByteIOContext *bc, int64_t val){ + if (val<=0) put_v(bc, -2*val ); + else put_v(bc, 2*val-1); +} + +static void put_vb(ByteIOContext *bc, uint64_t val){ + int i; + + for (i=8; val>>i; i+=8); + + put_v(bc, i>>3); + for(i-=8; i>=0; i-=8) + put_byte(bc, (val>>i)&0xFF); +} + +#ifdef TRACE +static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){ + printf("get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); + + put_v(bc, v); +} + +static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){ + printf("get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); + + put_s(bc, v); +} + +static inline void put_vb_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){ + printf("get_vb %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line); + + put_vb(bc, v); +} +#define put_v(bc, v) put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) +#define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) +#define put_vb(bc, v) put_vb_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__) +#endif + +static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum) +{ + put_flush_packet(bc); + nut->packet_start[2]= url_ftell(bc) - 8; + nut->written_packet_size = max_size; + + /* packet header */ + put_v(bc, nut->written_packet_size); /* forward ptr */ + + if(calculate_checksum) + init_checksum(bc, av_adler32_update, 1); + + return 0; +} + +/** + * + * must not be called more then once per packet + */ +static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){ + int64_t start= nut->packet_start[2]; + int64_t cur= url_ftell(bc); + int size= cur - start - get_length(nut->written_packet_size)/7 - 8; + + if(calculate_checksum) + size += 4; + + if(size != nut->written_packet_size){ + int i; + + assert( size <= nut->written_packet_size ); + + url_fseek(bc, start + 8, SEEK_SET); + for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7) + put_byte(bc, 0x80); + put_v(bc, size); + + url_fseek(bc, cur, SEEK_SET); + nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ + + if(calculate_checksum) + put_be32(bc, get_checksum(bc)); + } + + return 0; +} + +static int nut_write_header(AVFormatContext *s) +{ + NUTContext *nut = s->priv_data; + ByteIOContext *bc = &s->pb; + AVCodecContext *codec; + int i, j, tmp_time, tmp_flags,tmp_stream, tmp_mul, tmp_size, tmp_fields; + + if (strcmp(s->filename, "./data/b-libav.nut")) { + av_log(s, AV_LOG_ERROR, " libavformat NUT is non-compliant and disabled\n"); + return -1; + } + + nut->avf= s; + + nut->stream = + av_mallocz(sizeof(StreamContext)*s->nb_streams); + + + put_buffer(bc, ID_STRING, strlen(ID_STRING)); + put_byte(bc, 0); + nut->packet_start[2]= url_ftell(bc); + + /* main header */ + put_be64(bc, MAIN_STARTCODE); + put_packetheader(nut, bc, 120+5*256, 1); + put_v(bc, 2); /* version */ + put_v(bc, s->nb_streams); + put_v(bc, MAX_DISTANCE); + put_v(bc, MAX_SHORT_DISTANCE); + + put_v(bc, nut->rate_num=1); + put_v(bc, nut->rate_den=2); + put_v(bc, nut->short_startcode=0x4EFE79); + + build_frame_code(s); + assert(nut->frame_code['N'].flags == FLAG_INVALID); + + tmp_time= tmp_flags= tmp_stream= tmp_mul= tmp_size= /*tmp_res=*/ INT_MAX; + for(i=0; i<256;){ + tmp_fields=0; + tmp_size= 0; + if(tmp_time != nut->frame_code[i].timestamp_delta) tmp_fields=1; + if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2; + if(tmp_stream != nut->frame_code[i].stream_id_plus1) tmp_fields=3; + if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4; +// if(tmp_res != nut->frame_code[i].res ) tmp_fields=5; + + tmp_time = nut->frame_code[i].timestamp_delta; + tmp_flags = nut->frame_code[i].flags; + tmp_stream= nut->frame_code[i].stream_id_plus1; + tmp_mul = nut->frame_code[i].size_mul; + tmp_size = nut->frame_code[i].size_lsb; +// tmp_res = nut->frame_code[i].res; + + for(j=0; i<256; j++,i++){ + if(nut->frame_code[i].timestamp_delta != tmp_time ) break; + if(nut->frame_code[i].flags != tmp_flags ) break; + if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break; + if(nut->frame_code[i].size_mul != tmp_mul ) break; + if(nut->frame_code[i].size_lsb != tmp_size+j) break; +// if(nut->frame_code[i].res != tmp_res ) break; + } + if(j != tmp_mul - tmp_size) tmp_fields=6; + + put_v(bc, tmp_flags); + put_v(bc, tmp_fields); + if(tmp_fields>0) put_s(bc, tmp_time); + if(tmp_fields>1) put_v(bc, tmp_mul); + if(tmp_fields>2) put_v(bc, tmp_stream); + if(tmp_fields>3) put_v(bc, tmp_size); + if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/); + if(tmp_fields>5) put_v(bc, j); + } + + update_packetheader(nut, bc, 0, 1); + + /* stream headers */ + for (i = 0; i < s->nb_streams; i++) + { + int nom, denom, ssize; + + codec = s->streams[i]->codec; + + put_be64(bc, STREAM_STARTCODE); + put_packetheader(nut, bc, 120 + codec->extradata_size, 1); + put_v(bc, i /*s->streams[i]->index*/); + switch(codec->codec_type){ + case CODEC_TYPE_VIDEO: put_v(bc, 0); break; + case CODEC_TYPE_AUDIO: put_v(bc, 1); break; +// case CODEC_TYPE_TEXT : put_v(bc, 2); break; + case CODEC_TYPE_DATA : put_v(bc, 3); break; + default: return -1; + } + if (codec->codec_tag) + put_vb(bc, codec->codec_tag); + else if (codec->codec_type == CODEC_TYPE_VIDEO) + { + put_vb(bc, codec_get_bmp_tag(codec->codec_id)); + } + else if (codec->codec_type == CODEC_TYPE_AUDIO) + { + put_vb(bc, codec_get_wav_tag(codec->codec_id)); + } + else + put_vb(bc, 0); + + ff_parse_specific_params(codec, &nom, &ssize, &denom); + + nut->stream[i].rate_num= nom; + nut->stream[i].rate_den= denom; + av_set_pts_info(s->streams[i], 60, denom, nom); + + put_v(bc, codec->bit_rate); + put_vb(bc, 0); /* no language code */ + put_v(bc, nom); + put_v(bc, denom); + if(nom / denom < 1000) + nut->stream[i].msb_timestamp_shift = 7; + else + nut->stream[i].msb_timestamp_shift = 14; + put_v(bc, nut->stream[i].msb_timestamp_shift); + put_v(bc, codec->has_b_frames); + put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */ + + if(codec->extradata_size){ + put_v(bc, 1); + put_v(bc, codec->extradata_size); + put_buffer(bc, codec->extradata, codec->extradata_size); + } + put_v(bc, 0); /* end of codec specific headers */ + + switch(codec->codec_type) + { + case CODEC_TYPE_AUDIO: + put_v(bc, codec->sample_rate); + put_v(bc, 1); + put_v(bc, codec->channels); + break; + case CODEC_TYPE_VIDEO: + put_v(bc, codec->width); + put_v(bc, codec->height); + put_v(bc, codec->sample_aspect_ratio.num); + put_v(bc, codec->sample_aspect_ratio.den); + put_v(bc, 0); /* csp type -- unknown */ + break; + default: + break; + } + update_packetheader(nut, bc, 0, 1); + } + + /* info header */ + put_be64(bc, INFO_STARTCODE); + put_packetheader(nut, bc, 30+strlen(s->author)+strlen(s->title)+ + strlen(s->comment)+strlen(s->copyright)+strlen(LIBAVFORMAT_IDENT), 1); + if (s->author[0]) + { + put_v(bc, 9); /* type */ + put_str(bc, s->author); + } + if (s->title[0]) + { + put_v(bc, 10); /* type */ + put_str(bc, s->title); + } + if (s->comment[0]) + { + put_v(bc, 11); /* type */ + put_str(bc, s->comment); + } + if (s->copyright[0]) + { + put_v(bc, 12); /* type */ + put_str(bc, s->copyright); + } + /* encoder */ + if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)){ + put_v(bc, 13); /* type */ + put_str(bc, LIBAVFORMAT_IDENT); + } + + put_v(bc, 0); /* eof info */ + update_packetheader(nut, bc, 0, 1); + + put_flush_packet(bc); + + return 0; +} + +static int nut_write_packet(AVFormatContext *s, AVPacket *pkt) +{ + NUTContext *nut = s->priv_data; + StreamContext *stream= &nut->stream[pkt->stream_index]; + ByteIOContext *bc = &s->pb; + int key_frame = 0, full_pts=0; + AVCodecContext *enc; + int64_t coded_pts; + int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb, time_delta; + const int64_t frame_start= url_ftell(bc); + int64_t pts= pkt->pts; + int size= pkt->size; + int stream_index= pkt->stream_index; + + enc = s->streams[stream_index]->codec; + key_frame = !!(pkt->flags & PKT_FLAG_KEY); + + frame_type=0; + if(frame_start + size + 20 - FFMAX(nut->packet_start[1], nut->packet_start[2]) > MAX_DISTANCE) + frame_type=2; + if(key_frame && !stream->last_key_frame) + frame_type=2; + + if(frame_type>1){ + int64_t global_ts= av_rescale(pts, stream->rate_den*(int64_t)nut->rate_num, stream->rate_num*(int64_t)nut->rate_den); + reset(s, global_ts); + put_be64(bc, KEYFRAME_STARTCODE); + put_v(bc, global_ts); + } + assert(stream->last_pts != AV_NOPTS_VALUE); + coded_pts = pts & ((1<<stream->msb_timestamp_shift)-1); + if(lsb2full(stream, coded_pts) != pts) + full_pts=1; + + if(full_pts) + coded_pts= pts + (1<<stream->msb_timestamp_shift); + + best_length=INT_MAX; + frame_code= -1; + for(i=0; i<256; i++){ + int stream_id_plus1= nut->frame_code[i].stream_id_plus1; + int fc_key_frame; + int length=0; + size_mul= nut->frame_code[i].size_mul; + size_lsb= nut->frame_code[i].size_lsb; + time_delta= nut->frame_code[i].timestamp_delta; + flags= nut->frame_code[i].flags; + + assert(size_mul > size_lsb); + + if(stream_id_plus1 == 0) length+= get_length(stream_index); + else if(stream_id_plus1 - 1 != stream_index) + continue; + fc_key_frame= !!(flags & FLAG_KEY_FRAME); + + assert(key_frame==0 || key_frame==1); + if(fc_key_frame != key_frame) + continue; + + if(flags & FLAG_DATA_SIZE){ + if(size % size_mul != size_lsb) + continue; + length += get_length(size / size_mul); + }else if(size != size_lsb) + continue; + + if(full_pts && time_delta) + continue; + + if(!time_delta){ + length += get_length(coded_pts); + }else{ + if(time_delta != pts - stream->last_pts) + continue; + } + + if(length < best_length){ + best_length= length; + frame_code=i; + } +// av_log(s, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d %d %d\n", key_frame, frame_type, full_pts, size, stream_index, flags, size_mul, size_lsb, stream_id_plus1, length); + } + + assert(frame_code != -1); + flags= nut->frame_code[frame_code].flags; + size_mul= nut->frame_code[frame_code].size_mul; + size_lsb= nut->frame_code[frame_code].size_lsb; + time_delta= nut->frame_code[frame_code].timestamp_delta; +#ifdef TRACE + best_length /= 7; + best_length ++; //frame_code + if(frame_type==2){ + best_length += 8; // startcode + } + av_log(s, AV_LOG_DEBUG, "kf:%d ft:%d pt:%d fc:%2X len:%2d size:%d stream:%d flag:%d mul:%d lsb:%d s+1:%d pts_delta:%d pts:%"PRId64" fs:%"PRId64"\n", key_frame, frame_type, full_pts ? 1 : 0, frame_code, best_length, size, stream_index, flags, size_mul, size_lsb, nut->frame_code[frame_code].stream_id_plus1,(int)(pts - stream->last_pts), pts, frame_start); +// av_log(s, AV_LOG_DEBUG, "%d %d %d\n", stream->lru_pts_delta[0], stream->lru_pts_delta[1], stream->lru_pts_delta[2]); +#endif + + assert(frame_type != 1); //short startcode not implemented yet + put_byte(bc, frame_code); + + if(nut->frame_code[frame_code].stream_id_plus1 == 0) + put_v(bc, stream_index); + if (!time_delta){ + put_v(bc, coded_pts); + } + if(flags & FLAG_DATA_SIZE) + put_v(bc, size / size_mul); + else + assert(size == size_lsb); + if(size > MAX_DISTANCE){ + assert(frame_type > 1); + } + + put_buffer(bc, pkt->data, size); + + update(nut, stream_index, frame_start, frame_type, frame_code, key_frame, size, pts); + + return 0; +} + +static int nut_write_trailer(AVFormatContext *s) +{ + NUTContext *nut = s->priv_data; + ByteIOContext *bc = &s->pb; + +#if 0 + int i; + + /* WRITE INDEX */ + + for (i = 0; s->nb_streams; i++) + { + put_be64(bc, INDEX_STARTCODE); + put_packetheader(nut, bc, 64, 1); + put_v(bc, s->streams[i]->id); + put_v(bc, ...); + update_packetheader(nut, bc, 0, 1); + } +#endif + + put_flush_packet(bc); + + av_freep(&nut->stream); + + return 0; +} +#endif //CONFIG_MUXERS + +static int nut_probe(AVProbeData *p) +{ + int i; + uint64_t code= 0xff; + + for (i = 0; i < p->buf_size; i++) { + code = (code << 8) | p->buf[i]; + if (code == MAIN_STARTCODE) + return AVPROBE_SCORE_MAX; + } + return 0; +} + +static int decode_main_header(NUTContext *nut){ + AVFormatContext *s= nut->avf; + ByteIOContext *bc = &s->pb; + uint64_t tmp; + int i, j, tmp_stream, tmp_mul, tmp_time, tmp_size, count, tmp_res; + + get_packetheader(nut, bc, 1); + + tmp = get_v(bc); + if (tmp != 2){ + av_log(s, AV_LOG_ERROR, "bad version (%"PRId64")\n", tmp); + return -1; + } + + nut->stream_count = get_v(bc); + if(nut->stream_count > MAX_STREAMS){ + av_log(s, AV_LOG_ERROR, "too many streams\n"); + return -1; + } + nut->max_distance = get_v(bc); + nut->max_short_distance = get_v(bc); + nut->rate_num= get_v(bc); + nut->rate_den= get_v(bc); + nut->short_startcode= get_v(bc); + if(nut->short_startcode>>16 != 'N'){ + av_log(s, AV_LOG_ERROR, "invalid short startcode %X\n", nut->short_startcode); + return -1; + } + + for(i=0; i<256;){ + int tmp_flags = get_v(bc); + int tmp_fields= get_v(bc); + if(tmp_fields>0) tmp_time = 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 > nut->stream_count + 1){ + av_log(s, AV_LOG_ERROR, "illegal stream number\n"); + return -1; + } + + for(j=0; j<count; j++,i++){ + nut->frame_code[i].flags = tmp_flags ; + nut->frame_code[i].timestamp_delta = tmp_time ; + nut->frame_code[i].stream_id_plus1 = 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 ; + } + } + if(nut->frame_code['N'].flags != FLAG_INVALID){ + av_log(s, AV_LOG_ERROR, "illegal frame_code table\n"); + return -1; + } + + if(check_checksum(bc)){ + av_log(s, AV_LOG_ERROR, "Main header checksum mismatch\n"); + return -1; + } + + return 0; +} + +static int decode_stream_header(NUTContext *nut){ + AVFormatContext *s= nut->avf; + ByteIOContext *bc = &s->pb; + int class, nom, denom, stream_id; + uint64_t tmp; + AVStream *st; + + get_packetheader(nut, bc, 1); + stream_id= get_v(bc); + if(stream_id >= nut->stream_count || s->streams[stream_id]) + return -1; + + st = av_new_stream(s, stream_id); + if (!st) + return AVERROR_NOMEM; + + class = get_v(bc); + tmp = get_vb(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: + case 32: //compatibility + 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; + } + s->bit_rate += get_v(bc); + get_vb(bc); /* language code */ + nom = get_v(bc); + denom = get_v(bc); + nut->stream[stream_id].msb_timestamp_shift = get_v(bc); + st->codec->has_b_frames= + nut->stream[stream_id].decode_delay= get_v(bc); + get_byte(bc); /* flags */ + + /* codec specific data headers */ + while(get_v(bc) != 0){ + st->codec->extradata_size= get_v(bc); + if((unsigned)st->codec->extradata_size > (1<<30)) + return -1; + st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); + get_buffer(bc, st->codec->extradata, st->codec->extradata_size); +// url_fskip(bc, get_v(bc)); + } + + if (st->codec->codec_type == CODEC_TYPE_VIDEO) /* VIDEO */ + { + st->codec->width = get_v(bc); + st->codec->height = get_v(bc); + st->codec->sample_aspect_ratio.num= get_v(bc); + st->codec->sample_aspect_ratio.den= get_v(bc); + get_v(bc); /* csp type */ + } + if (st->codec->codec_type == CODEC_TYPE_AUDIO) /* AUDIO */ + { + st->codec->sample_rate = get_v(bc); + get_v(bc); // samplerate_den + st->codec->channels = get_v(bc); + } + if(check_checksum(bc)){ + av_log(s, AV_LOG_ERROR, "Stream header %d checksum mismatch\n", stream_id); + return -1; + } + av_set_pts_info(s->streams[stream_id], 60, denom, nom); + nut->stream[stream_id].rate_num= nom; + nut->stream[stream_id].rate_den= denom; + return 0; +} + +static int decode_info_header(NUTContext *nut){ + AVFormatContext *s= nut->avf; + ByteIOContext *bc = &s->pb; + + get_packetheader(nut, bc, 1); + + for(;;){ + int id= get_v(bc); + char *name, *type, custom_name[256], custom_type[256]; + + if(!id) + break; + else if(id >= sizeof(info_table)/sizeof(info_table[0])){ + av_log(s, AV_LOG_ERROR, "info id is too large %d %zd\n", id, sizeof(info_table)/sizeof(info_table[0])); + return -1; + } + + type= info_table[id][1]; + name= info_table[id][0]; +//av_log(s, AV_LOG_DEBUG, "%d %s %s\n", id, type, name); + + if(!type){ + get_str(bc, custom_type, sizeof(custom_type)); + type= custom_type; + } + if(!name){ + get_str(bc, custom_name, sizeof(custom_name)); + name= custom_name; + } + + if(!strcmp(type, "v")){ + get_v(bc); + }else{ + if(!strcmp(name, "Author")) + get_str(bc, s->author, sizeof(s->author)); + else if(!strcmp(name, "Title")) + get_str(bc, s->title, sizeof(s->title)); + else if(!strcmp(name, "Copyright")) + get_str(bc, s->copyright, sizeof(s->copyright)); + else if(!strcmp(name, "Description")) + get_str(bc, s->comment, sizeof(s->comment)); + else + get_str(bc, NULL, 0); + } + } + if(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){ + av_log(s, AV_LOG_ERROR, "no main startcode found\n"); + return -1; + } + if(decode_main_header(nut) >= 0) + break; + } + + + s->bit_rate = 0; + + nut->stream = av_malloc(sizeof(StreamContext)*nut->stream_count); + + /* stream headers */ + pos=0; + for(inited_stream_count=0; inited_stream_count < nut->stream_count;){ + 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 == KEYFRAME_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 *key_frame_ret, int64_t *pts_ret, int *stream_id_ret, int frame_code, int frame_type, int64_t frame_start){ + AVFormatContext *s= nut->avf; + StreamContext *stream; + ByteIOContext *bc = &s->pb; + int size, flags, size_mul, size_lsb, stream_id, time_delta; + int64_t pts = 0; + + if(frame_type < 2 && frame_start - nut->packet_start[2] > nut->max_distance){ + av_log(s, AV_LOG_ERROR, "last frame must have been damaged\n"); + return -1; + } + + if(frame_type) + nut->packet_start[ frame_type ]= frame_start; //otherwise 1 goto 1 may happen + + flags= nut->frame_code[frame_code].flags; + size_mul= nut->frame_code[frame_code].size_mul; + size_lsb= nut->frame_code[frame_code].size_lsb; + stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1; + time_delta= nut->frame_code[frame_code].timestamp_delta; + + if(stream_id==-1) + stream_id= get_v(bc); + if(stream_id >= s->nb_streams){ + av_log(s, AV_LOG_ERROR, "illegal stream_id\n"); + return -1; + } + stream= &nut->stream[stream_id]; + +// av_log(s, AV_LOG_DEBUG, "ft:%d ppts:%d %d %d\n", frame_type, stream->lru_pts_delta[0], stream->lru_pts_delta[1], stream->lru_pts_delta[2]); + + *key_frame_ret= !!(flags & FLAG_KEY_FRAME); + + if(!time_delta){ + int64_t mask = (1<<stream->msb_timestamp_shift)-1; + pts= get_v(bc); + if(pts > mask){ + pts -= mask+1; + }else{ + if(stream->last_pts == AV_NOPTS_VALUE){ + av_log(s, AV_LOG_ERROR, "no reference pts available\n"); + return -1; + } + pts= lsb2full(stream, pts); + } + }else{ + if(stream->last_pts == AV_NOPTS_VALUE){ + av_log(s, AV_LOG_ERROR, "no reference pts available\n"); + return -1; + } + pts= stream->last_pts + time_delta; + } + + if(*key_frame_ret){ +// av_log(s, AV_LOG_DEBUG, "stream:%d start:%"PRId64" pts:%"PRId64" length:%"PRId64"\n",stream_id, frame_start, av_pts, frame_start - nut->stream[stream_id].last_sync_pos); + av_add_index_entry( + s->streams[stream_id], + frame_start, + pts, + 0, + frame_start - nut->stream[stream_id].last_sync_pos, + AVINDEX_KEYFRAME); + nut->stream[stream_id].last_sync_pos= frame_start; +// assert(nut->packet_start == frame_start); + } + + assert(size_mul > size_lsb); + size= size_lsb; + if(flags & FLAG_DATA_SIZE) + size+= size_mul*get_v(bc); + +#ifdef TRACE +av_log(s, AV_LOG_DEBUG, "fs:%"PRId64" fc:%d ft:%d kf:%d pts:%"PRId64" size:%d mul:%d lsb:%d flags:%d delta:%d\n", frame_start, frame_code, frame_type, *key_frame_ret, pts, size, size_mul, size_lsb, flags, time_delta); +#endif + + if(frame_type==0 && url_ftell(bc) - nut->packet_start[2] + size > nut->max_distance){ + av_log(s, AV_LOG_ERROR, "frame size too large\n"); + return -1; + } + + *stream_id_ret = stream_id; + *pts_ret = pts; + + update(nut, stream_id, frame_start, frame_type, frame_code, *key_frame_ret, size, pts); + + return size; +} + +static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int frame_type, int64_t frame_start){ + AVFormatContext *s= nut->avf; + ByteIOContext *bc = &s->pb; + int size, stream_id, key_frame, discard; + int64_t pts, last_IP_pts; + + size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, frame_start); + 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 && !key_frame) + ||(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 (key_frame) + 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; + + for(;;){ + int64_t pos= url_ftell(bc); + int frame_type= 0; + 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: + get_packetheader(nut, bc, 0); + assert(nut->packet_start[2] == pos); + url_fseek(bc, nut->written_packet_size, SEEK_CUR); + break; + case INFO_STARTCODE: + if(decode_info_header(nut)<0) + goto resync; + break; + case KEYFRAME_STARTCODE: + frame_type = 2; + reset(s, get_v(bc)); + frame_code = get_byte(bc); + case 0: + ret= decode_frame(nut, pkt, frame_code, frame_type, pos); + 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", nut->packet_start[2]+1); + tmp= find_any_startcode(bc, nut->packet_start[2]+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; + StreamContext *stream; + ByteIOContext *bc = &s->pb; + int64_t pos, pts; + uint64_t code; + int frame_code,step, stream_id, i,size, key_frame; +av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n", stream_index, *pos_arg, pos_limit); + + if(*pos_arg < 0) + return AV_NOPTS_VALUE; + + pos= *pos_arg; + step= FFMIN(16*1024, pos); + do{ + pos-= step; + code= find_any_startcode(bc, pos); + + if(code && url_ftell(bc) - 8 <= *pos_arg) + break; + step= FFMIN(2*step, pos); + }while(step); + + if(!code) //nothing found, not even after pos_arg + return AV_NOPTS_VALUE; + + url_fseek(bc, -8, SEEK_CUR); + for(i=0; i<s->nb_streams; i++) + nut->stream[i].last_sync_pos= url_ftell(bc); + + for(;;){ + int frame_type=0; + int64_t pos= url_ftell(bc); + uint64_t tmp=0; + + if(pos > pos_limit || url_feof(bc)) + return AV_NOPTS_VALUE; + + frame_code = get_byte(bc); + if(frame_code == 'N'){ + tmp= frame_code; + for(i=1; i<8; i++) + tmp = (tmp<<8) + get_byte(bc); + } +//av_log(s, AV_LOG_DEBUG, "before switch %"PRIX64" at=%"PRId64"\n", tmp, pos); + + switch(tmp){ + case MAIN_STARTCODE: + case STREAM_STARTCODE: + case INDEX_STARTCODE: + case INFO_STARTCODE: + get_packetheader(nut, bc, 0); + assert(nut->packet_start[2]==pos); + url_fseek(bc, nut->written_packet_size, SEEK_CUR); + break; + case KEYFRAME_STARTCODE: + frame_type=2; + reset(s, get_v(bc)); + frame_code = get_byte(bc); + case 0: + size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type, pos); + if(size < 0) + goto resync; + + stream= &nut->stream[stream_id]; + if(stream_id != stream_index || !key_frame || pos < *pos_arg){ + url_fseek(bc, size, SEEK_CUR); + break; + } + + *pos_arg= pos; + return pts; + default: +resync: +av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", nut->packet_start[2]+1); + if(!find_any_startcode(bc, nut->packet_start[2]+1)) + return AV_NOPTS_VALUE; + + url_fseek(bc, -8, SEEK_CUR); + } + } + return AV_NOPTS_VALUE; +} + +static int nut_read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){ +// NUTContext *nut = s->priv_data; + int64_t pos; + + if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0) + return -1; + + pos= url_ftell(&s->pb); + nut_read_timestamp(s, stream_index, &pos, pos-1); + + return 0; +} + +static int nut_read_close(AVFormatContext *s) +{ + NUTContext *nut = s->priv_data; + + 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, + nut_read_seek, + nut_read_timestamp, + .extensions = "nut", +}; +#endif +#ifdef CONFIG_NUT_MUXER +AVOutputFormat nut_muxer = { + "nut", + "nut format", + "video/x-nut", + "nut", + sizeof(NUTContext), +#ifdef CONFIG_LIBVORBIS + CODEC_ID_VORBIS, +#elif defined(CONFIG_MP3LAME) + CODEC_ID_MP3, +#else + CODEC_ID_MP2, /* AC3 needs liba52 decoder */ +#endif + CODEC_ID_MPEG4, + nut_write_header, + nut_write_packet, + nut_write_trailer, + .flags = AVFMT_GLOBALHEADER, +}; +#endif |