mirror of https://git.ffmpeg.org/ffmpeg.git
1339 lines
37 KiB
C
1339 lines
37 KiB
C
/*
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* "NUT" Container Format muxer and demuxer (DRAFT-200403??)
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* Copyright (c) 2003 Alex Beregszaszi
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* Copyright (c) 2004 Michael Niedermayer
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* NUT DRAFT can be found in MPlayer CVS at DOCS/tech/mpcf.txt
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*
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* AND http://people.fsn.hu/~alex/nut/ (TeX, pdf, ps, dvi, ..)
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*
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*/
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/*
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* TODO:
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* - index writing
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* - index packet reading support
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*/
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//#define DEBUG 1
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#include <limits.h>
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#include "avformat.h"
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#include "mpegaudio.h"
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#include "avi.h"
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#undef NDEBUG
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#include <assert.h>
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//from /dev/random
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#define MAIN_STARTCODE (0x7A561F5F04ADULL + (((uint64_t)('N'<<8) + 'M')<<48))
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#define STREAM_STARTCODE (0x11405BF2F9DBULL + (((uint64_t)('N'<<8) + 'S')<<48))
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#define KEYFRAME_STARTCODE (0xE4ADEECA4569ULL + (((uint64_t)('N'<<8) + 'K')<<48))
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#define INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48))
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#define INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48))
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#define MAX_DISTANCE (1024*16-1)
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#define MAX_SHORT_DISTANCE (1024*4-1)
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#define MAX_PTS_LRU 3
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#define FLAG_DATA_SIZE 4
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#define FLAG_PTS 3
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#define FLAG_KEY_FRAME 8
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typedef struct {
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uint8_t flags;
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uint8_t stream_id_plus1;
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uint16_t size_mul;
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uint16_t size_lsb;
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} FrameCode;
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typedef struct {
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int last_key_frame;
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int msb_timestamp_shift;
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int rate_num;
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int rate_den;
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int64_t last_pts;
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int lru_pts_delta[MAX_PTS_LRU];
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int initial_pts_predictor[MAX_PTS_LRU];
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int64_t last_sync_pos; ///<pos of last 1/2 type frame
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int decode_delay;
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} StreamContext;
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typedef struct {
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AVFormatContext *avf;
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int written_packet_size;
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int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
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FrameCode frame_code[256];
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int stream_count;
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uint64_t next_startcode; ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
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StreamContext *stream;
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int max_distance;
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} NUTContext;
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static char *info_table[][2]={
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{NULL , NULL }, // end
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{NULL , NULL },
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{NULL , "UTF8"},
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{NULL , "v"},
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{NULL , "s"},
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{"StreamId" , "v"},
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{"SegmentId" , "v"},
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{"StartTimestamp" , "v"},
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{"EndTimestamp" , "v"},
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{"Author" , "UTF8"},
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{"Title" , "UTF8"},
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{"Description" , "UTF8"},
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{"Copyright" , "UTF8"},
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{"Encoder" , "UTF8"},
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{"Keyword" , "UTF8"},
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{"Cover" , "JPEG"},
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{"Cover" , "PNG"},
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};
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static void update_lru(int *lru, int current, int count){
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int i;
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for(i=0; i<count-1; i++){
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if(lru[i] == current)
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break;
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}
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for(; i; i--){
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lru[i]= lru[i-1];
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}
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lru[0]= current;
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}
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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){
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StreamContext *stream= &nut->stream[stream_index];
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stream->last_key_frame= key_frame;
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nut->packet_start[ frame_type ]= frame_start;
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if(stream->last_pts != AV_NOPTS_VALUE){
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assert(frame_type < 2);
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update_lru(stream->lru_pts_delta, pts - stream->last_pts, 3);
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}
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stream->last_pts= pts;
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}
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static void reset(AVFormatContext *s/*, int frame_type*/){
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NUTContext *nut = s->priv_data;
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int i;
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for(i=0; i<s->nb_streams; i++){
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StreamContext *stream= &nut->stream[i];
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stream->last_key_frame= 1;
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stream->last_pts= AV_NOPTS_VALUE;
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memcpy(stream->lru_pts_delta, stream->initial_pts_predictor, sizeof(int)*MAX_PTS_LRU);
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}
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}
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static void build_frame_code(AVFormatContext *s){
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NUTContext *nut = s->priv_data;
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int key_frame, index, pred, stream_id, full_pts;
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int start=0;
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int end= 255;
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int keyframe_0_esc= s->nb_streams > 2;
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if(keyframe_0_esc){
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/* keyframe = 0 escape */
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FrameCode *ft= &nut->frame_code[start];
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ft->flags= FLAG_DATA_SIZE | FLAG_PTS;
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ft->stream_id_plus1= 0;
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ft->size_mul=1;
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start++;
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}
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for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
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int start2= start + (end-start)*stream_id / s->nb_streams;
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int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
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AVCodecContext *codec = &s->streams[stream_id]->codec;
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int is_audio= codec->codec_type == CODEC_TYPE_AUDIO;
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int intra_only= /*codec->intra_only || */is_audio;
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int pred_count;
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for(key_frame=0; key_frame<2; key_frame++){
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if(intra_only && keyframe_0_esc && key_frame==0)
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continue;
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{
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FrameCode *ft= &nut->frame_code[start2];
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ft->flags= FLAG_KEY_FRAME*key_frame;
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ft->flags|= FLAG_DATA_SIZE | FLAG_PTS;
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ft->stream_id_plus1= stream_id + 1;
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ft->size_mul=1;
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start2++;
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}
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}
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key_frame= intra_only;
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#if 1
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if(is_audio){
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int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
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for(full_pts=0; full_pts<2; full_pts++){
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for(pred=0; pred<2; pred++){
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FrameCode *ft= &nut->frame_code[start2];
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ft->flags= FLAG_KEY_FRAME*key_frame + FLAG_PTS*full_pts;
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ft->stream_id_plus1= stream_id + 1;
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ft->size_mul=frame_bytes + 2;
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ft->size_lsb=frame_bytes + pred;
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start2++;
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av_log(NULL, AV_LOG_DEBUG, "%d\n", frame_bytes + pred);
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}
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}
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}else{
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FrameCode *ft= &nut->frame_code[start2];
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ft->flags= FLAG_KEY_FRAME | FLAG_DATA_SIZE;
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ft->stream_id_plus1= stream_id + 1;
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ft->size_mul=1;
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start2++;
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}
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#endif
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pred_count= 2 + codec->has_b_frames + (codec->codec_id == CODEC_ID_VORBIS);
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for(pred=0; pred<pred_count; pred++){
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int start3= start2 + (end2-start2)*pred / pred_count;
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int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
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for(index=start3; index<end3; index++){
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FrameCode *ft= &nut->frame_code[index];
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ft->flags= FLAG_KEY_FRAME*key_frame + pred*4;
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ft->flags|= FLAG_DATA_SIZE;
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ft->stream_id_plus1= stream_id + 1;
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//FIXME use single byte size and pred from last
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ft->size_mul= end3-start3;
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ft->size_lsb= index - start3;
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}
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nut->stream[stream_id].initial_pts_predictor[pred]= pred+1;
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}
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}
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memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
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nut->frame_code['N'].flags= 1;
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}
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static uint64_t get_v(ByteIOContext *bc)
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{
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uint64_t val = 0;
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for(;;)
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{
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int tmp = get_byte(bc);
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if (tmp&0x80)
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val= (val<<7) + tmp - 0x80;
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else{
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//av_log(NULL, AV_LOG_DEBUG, "get_v()= %lld\n", (val<<7) + tmp);
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return (val<<7) + tmp;
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}
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}
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return -1;
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}
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static int get_str(ByteIOContext *bc, char *string, int maxlen){
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int len= get_v(bc);
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if(len && maxlen)
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get_buffer(bc, string, FFMIN(len, maxlen));
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while(len > maxlen){
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get_byte(bc);
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len--;
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}
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if(maxlen)
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string[FFMIN(len, maxlen-1)]= 0;
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if(maxlen == len)
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return -1;
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else
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return 0;
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}
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static uint64_t get_vb(ByteIOContext *bc){
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uint64_t val=0;
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int i= get_v(bc);
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if(i>8)
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return UINT64_MAX;
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while(i--)
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val = (val<<8) + get_byte(bc);
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//av_log(NULL, AV_LOG_DEBUG, "get_vb()= %lld\n", val);
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return val;
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}
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static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum)
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{
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int64_t start, size;
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start= url_ftell(bc) - 8;
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init_checksum(bc, calculate_checksum ? update_adler32 : NULL, 0);
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size= get_v(bc);
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nut->packet_start[2] = start;
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nut->written_packet_size= size;
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return size;
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}
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static int check_checksum(ByteIOContext *bc){
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unsigned long checksum= get_checksum(bc);
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return checksum != get_be32(bc);
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}
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/**
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*
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*/
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static int get_length(uint64_t val){
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int i;
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for (i=7; val>>i; i+=7);
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return i;
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}
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static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
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uint64_t state=0;
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if(pos >= 0)
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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
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while(!url_feof(bc)){
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state= (state<<8) | get_byte(bc);
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if((state>>56) != 'N')
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continue;
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switch(state){
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case MAIN_STARTCODE:
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case STREAM_STARTCODE:
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case KEYFRAME_STARTCODE:
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case INFO_STARTCODE:
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case INDEX_STARTCODE:
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return state;
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}
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}
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return 0;
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}
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/**
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* find the given startcode.
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* @param code the startcode
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* @param pos the start position of the search, or -1 if the current position
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* @returns the position of the startcode or -1 if not found
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*/
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static int64_t find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
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for(;;){
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uint64_t startcode= find_any_startcode(bc, pos);
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if(startcode == code)
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return url_ftell(bc) - 8;
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else if(startcode == 0)
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return -1;
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pos=-1;
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}
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}
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#ifdef CONFIG_ENCODERS
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static void put_v(ByteIOContext *bc, uint64_t val)
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{
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int i;
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//av_log(NULL, AV_LOG_DEBUG, "put_v()= %lld\n", val);
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val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
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i= get_length(val);
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for (i-=7; i>0; i-=7){
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put_byte(bc, 0x80 | (val>>i));
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}
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put_byte(bc, val&0x7f);
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}
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/**
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* stores a string as vb.
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*/
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static void put_str(ByteIOContext *bc, const char *string){
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int len= strlen(string);
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put_v(bc, len);
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put_buffer(bc, string, len);
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}
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static void put_vb(ByteIOContext *bc, uint64_t val){
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int i;
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for (i=8; val>>i; i+=8);
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put_v(bc, i>>3);
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for(i-=8; i>=0; i-=8)
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put_byte(bc, (val>>i)&0xFF);
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}
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static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum)
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{
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put_flush_packet(bc);
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nut->packet_start[2]+= nut->written_packet_size;
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assert(url_ftell(bc) - 8 == nut->packet_start[2]);
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nut->written_packet_size = max_size;
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if(calculate_checksum)
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init_checksum(bc, update_adler32, 0);
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/* packet header */
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put_v(bc, nut->written_packet_size); /* forward ptr */
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return 0;
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}
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static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){
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int64_t start= nut->packet_start[2];
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int64_t cur= url_ftell(bc);
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int size= cur - start + additional_size;
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if(calculate_checksum)
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size += 4;
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if(size != nut->written_packet_size){
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int i;
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assert( size <= nut->written_packet_size );
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url_fseek(bc, start + 8, SEEK_SET);
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for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7)
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put_byte(bc, 0x80);
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put_v(bc, size);
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url_fseek(bc, cur, SEEK_SET);
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nut->written_packet_size= size; //FIXME may fail if multiple updates with differing sizes, as get_length may differ
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if(calculate_checksum)
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put_be32(bc, get_checksum(bc));
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}
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return 0;
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}
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static int nut_write_header(AVFormatContext *s)
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{
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NUTContext *nut = s->priv_data;
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ByteIOContext *bc = &s->pb;
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AVCodecContext *codec;
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int i, j;
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nut->avf= s;
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nut->stream =
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av_mallocz(sizeof(StreamContext)*s->nb_streams);
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av_set_pts_info(s, 60, 1, AV_TIME_BASE);
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/* main header */
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put_be64(bc, MAIN_STARTCODE);
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put_packetheader(nut, bc, 120+5*256, 1);
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put_v(bc, 2); /* version */
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put_v(bc, s->nb_streams);
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put_v(bc, MAX_DISTANCE);
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build_frame_code(s);
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assert(nut->frame_code['N'].flags == 1);
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for(i=0; i<256;){
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int tmp_flags = nut->frame_code[i].flags;
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int tmp_stream= nut->frame_code[i].stream_id_plus1;
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int tmp_mul = nut->frame_code[i].size_mul;
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int tmp_size = nut->frame_code[i].size_lsb;
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put_v(bc, tmp_flags);
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put_v(bc, tmp_stream);
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put_v(bc, tmp_mul);
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put_v(bc, tmp_size);
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for(j=0; i<256; j++,i++){
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if(nut->frame_code[i].flags != tmp_flags ) break;
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if(nut->frame_code[i].stream_id_plus1 != tmp_stream) break;
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if(nut->frame_code[i].size_mul != tmp_mul ) break;
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if(nut->frame_code[i].size_lsb != tmp_size ) break;
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if(++tmp_size >= tmp_mul){
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tmp_size=0;
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tmp_stream++;
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}
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}
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put_v(bc, j);
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}
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update_packetheader(nut, bc, 0, 1);
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/* stream headers */
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for (i = 0; i < s->nb_streams; i++)
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{
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int nom, denom, gcd;
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codec = &s->streams[i]->codec;
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put_be64(bc, STREAM_STARTCODE);
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put_packetheader(nut, bc, 120 + codec->extradata_size, 1);
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put_v(bc, i /*s->streams[i]->index*/);
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put_v(bc, (codec->codec_type == CODEC_TYPE_AUDIO) ? 32 : 0);
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if (codec->codec_tag)
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put_vb(bc, codec->codec_tag);
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else if (codec->codec_type == CODEC_TYPE_VIDEO)
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{
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put_vb(bc, codec_get_bmp_tag(codec->codec_id));
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}
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else if (codec->codec_type == CODEC_TYPE_AUDIO)
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{
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put_vb(bc, codec_get_wav_tag(codec->codec_id));
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}
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else
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put_vb(bc, 0);
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|
|
if (codec->codec_type == CODEC_TYPE_VIDEO)
|
|
{
|
|
nom = codec->frame_rate;
|
|
denom = codec->frame_rate_base;
|
|
}
|
|
else
|
|
{
|
|
nom = codec->sample_rate;
|
|
if(codec->frame_size>0)
|
|
denom= codec->frame_size;
|
|
else
|
|
denom= 1; //unlucky
|
|
}
|
|
gcd= ff_gcd(nom, denom);
|
|
nom /= gcd;
|
|
denom /= gcd;
|
|
nut->stream[i].rate_num= nom;
|
|
nut->stream[i].rate_den= denom;
|
|
|
|
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);
|
|
for(j=0; j<3; j++)
|
|
put_v(bc, nut->stream[i].initial_pts_predictor[j]);
|
|
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 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;
|
|
}
|
|
|
|
static int nut_write_packet(AVFormatContext *s, int stream_index,
|
|
const uint8_t *buf, int size, int64_t pts)
|
|
{
|
|
NUTContext *nut = s->priv_data;
|
|
StreamContext *stream= &nut->stream[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;
|
|
const int64_t frame_start= url_ftell(bc);
|
|
|
|
if (stream_index > s->nb_streams)
|
|
return 1;
|
|
|
|
pts= (av_rescale(pts, stream->rate_num, stream->rate_den) + AV_TIME_BASE/2) / AV_TIME_BASE;
|
|
|
|
enc = &s->streams[stream_index]->codec;
|
|
key_frame = enc->coded_frame->key_frame;
|
|
if(enc->coded_frame->pts != AV_NOPTS_VALUE)
|
|
pts= (av_rescale(enc->coded_frame->pts, stream->rate_num, stream->rate_den) + AV_TIME_BASE/2) / AV_TIME_BASE; //FIXME XXX HACK
|
|
|
|
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)
|
|
reset(s);
|
|
if(stream->last_pts == AV_NOPTS_VALUE)
|
|
full_pts=1;
|
|
else{
|
|
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;
|
|
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 && (flags & FLAG_PTS) != FLAG_PTS)
|
|
continue;
|
|
|
|
if(flags&FLAG_PTS){
|
|
length += get_length(coded_pts);
|
|
}else{
|
|
int delta= stream->lru_pts_delta[flags & FLAG_PTS];
|
|
if(delta != pts - stream->last_pts)
|
|
continue;
|
|
assert(frame_type < 2);
|
|
}
|
|
|
|
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;
|
|
#if 0
|
|
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:%lld\n", key_frame, frame_type, full_pts ? 2 : ((flags & FLAG_PTS) == FLAG_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);
|
|
// 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
|
|
|
|
if (frame_type==2)
|
|
put_be64(bc, KEYFRAME_STARTCODE);
|
|
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 ((flags & FLAG_PTS) == FLAG_PTS){
|
|
put_v(bc, coded_pts);
|
|
}
|
|
if(flags & FLAG_DATA_SIZE)
|
|
put_v(bc, size / size_mul);
|
|
if(size > MAX_DISTANCE){
|
|
assert(frame_type > 1);
|
|
}
|
|
|
|
put_buffer(bc, buf, 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_ENCODERS
|
|
|
|
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;
|
|
|
|
get_packetheader(nut, bc, 1);
|
|
|
|
tmp = get_v(bc);
|
|
if (tmp != 2){
|
|
av_log(s, AV_LOG_ERROR, "bad version (%Ld)\n", tmp);
|
|
return -1;
|
|
}
|
|
|
|
nut->stream_count = get_v(bc);
|
|
nut->max_distance = get_v(bc);
|
|
|
|
for(i=0; i<256;){
|
|
int tmp_flags = get_v(bc);
|
|
int tmp_stream= get_v(bc);
|
|
int tmp_mul = get_v(bc);
|
|
int tmp_size = get_v(bc);
|
|
int count = 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;
|
|
}
|
|
|
|
for(j=0; j<count; j++,i++){
|
|
if(tmp_stream > nut->stream_count + 1){
|
|
av_log(s, AV_LOG_ERROR, "illegal stream number\n");
|
|
return -1;
|
|
}
|
|
|
|
nut->frame_code[i].flags = tmp_flags ;
|
|
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 ;
|
|
if(++tmp_size >= tmp_mul){
|
|
tmp_size=0;
|
|
tmp_stream++;
|
|
}
|
|
}
|
|
}
|
|
if(nut->frame_code['N'].flags != 1){
|
|
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 missmatch\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, i;
|
|
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 32:
|
|
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;
|
|
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);
|
|
for(i=0; i<3; i++)
|
|
nut->stream[stream_id].initial_pts_predictor[i]= get_v(bc);
|
|
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);
|
|
st->codec.extradata= av_mallocz(st->codec.extradata_size);
|
|
get_buffer(bc, st->codec.extradata, st->codec.extradata_size);
|
|
// url_fskip(bc, get_v(bc));
|
|
}
|
|
|
|
if (class == 0) /* 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 */
|
|
|
|
st->codec.frame_rate = nom;
|
|
st->codec.frame_rate_base = denom;
|
|
}
|
|
if (class == 32) /* 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 missmatch\n", stream_id);
|
|
return -1;
|
|
}
|
|
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 %d\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")){
|
|
int value= 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 missmatch\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;
|
|
|
|
av_set_pts_info(s, 60, 1, AV_TIME_BASE);
|
|
|
|
/* 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){
|
|
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){
|
|
AVFormatContext *s= nut->avf;
|
|
StreamContext *stream;
|
|
ByteIOContext *bc = &s->pb;
|
|
int size, flags, size_mul, size_lsb, stream_id;
|
|
int64_t pts = 0;
|
|
const int prefix_len= frame_type == 2 ? 8+1 : 1;
|
|
const int64_t frame_start= url_ftell(bc) - prefix_len;
|
|
|
|
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;
|
|
|
|
if(frame_type == 2)
|
|
reset(s);
|
|
|
|
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((flags & FLAG_PTS) == FLAG_PTS){
|
|
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 + stream->lru_pts_delta[flags&FLAG_PTS];
|
|
}
|
|
|
|
if(*key_frame_ret){
|
|
int64_t av_pts= pts * AV_TIME_BASE * stream->rate_den / stream->rate_num;
|
|
// av_log(s, AV_LOG_DEBUG, "stream:%d start:%lld pts:%lld length:%lld\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,
|
|
av_pts,
|
|
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);
|
|
|
|
//av_log(s, AV_LOG_DEBUG, "fs:%lld fc:%d ft:%d kf:%d pts:%lld size:%d\n", frame_start, frame_code, frame_type, key_frame, pts, size);
|
|
|
|
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 * AV_TIME_BASE * stream->rate_den / stream->rate_num;
|
|
|
|
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){
|
|
AVFormatContext *s= nut->avf;
|
|
ByteIOContext *bc = &s->pb;
|
|
int size, stream_id, key_frame;
|
|
int64_t pts;
|
|
|
|
size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type);
|
|
if(size < 0)
|
|
return -1;
|
|
|
|
av_new_packet(pkt, size);
|
|
get_buffer(bc, pkt->data, 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;
|
|
|
|
for(;;){
|
|
int frame_type= 0;
|
|
uint64_t tmp= nut->next_startcode;
|
|
nut->next_startcode=0;
|
|
|
|
if (url_feof(bc))
|
|
return -1;
|
|
|
|
if(!tmp){
|
|
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);
|
|
url_fseek(bc, nut->written_packet_size + nut->packet_start[2], SEEK_SET);
|
|
break;
|
|
case INFO_STARTCODE:
|
|
if(decode_info_header(nut)<0)
|
|
goto resync;
|
|
break;
|
|
case KEYFRAME_STARTCODE:
|
|
frame_type = 2;
|
|
frame_code = get_byte(bc);
|
|
case 0:
|
|
if(decode_frame(nut, pkt, frame_code, frame_type)>=0)
|
|
return 0;
|
|
default:
|
|
resync:
|
|
av_log(s, AV_LOG_DEBUG, "syncing from %lld\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,%lld,%lld)\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 %llX at=%lld\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 + pos, SEEK_SET);
|
|
break;
|
|
case KEYFRAME_STARTCODE:
|
|
frame_type=2;
|
|
frame_code = get_byte(bc);
|
|
case 0:
|
|
size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type);
|
|
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 %lld\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){
|
|
// NUTContext *nut = s->priv_data;
|
|
int64_t pos;
|
|
|
|
if(av_seek_frame_binary(s, stream_index, target_ts) < 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;
|
|
int i;
|
|
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
av_freep(&s->streams[i]->codec.extradata);
|
|
}
|
|
av_freep(&nut->stream);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static AVInputFormat nut_iformat = {
|
|
"nut",
|
|
"nut format",
|
|
sizeof(NUTContext),
|
|
nut_probe,
|
|
nut_read_header,
|
|
nut_read_packet,
|
|
nut_read_close,
|
|
nut_read_seek,
|
|
nut_read_timestamp,
|
|
.extensions = "nut",
|
|
};
|
|
|
|
#ifdef CONFIG_ENCODERS
|
|
static AVOutputFormat nut_oformat = {
|
|
"nut",
|
|
"nut format",
|
|
"video/x-nut",
|
|
"nut",
|
|
sizeof(NUTContext),
|
|
#ifdef CONFIG_VORBIS
|
|
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,
|
|
};
|
|
#endif //CONFIG_ENCODERS
|
|
|
|
int nut_init(void)
|
|
{
|
|
av_register_input_format(&nut_iformat);
|
|
#ifdef CONFIG_ENCODERS
|
|
av_register_output_format(&nut_oformat);
|
|
#endif //CONFIG_ENCODERS
|
|
return 0;
|
|
}
|