611 lines
18 KiB
C
611 lines
18 KiB
C
/*
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* nut muxer
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* Copyright (c) 2004-2007 Michael Niedermayer
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "nut.h"
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#include "tree.h"
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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;
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int start=1;
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int end= 254;
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int keyframe_0_esc= s->nb_streams > 2;
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int pred_table[10];
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FrameCode *ft;
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ft= &nut->frame_code[start];
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ft->flags= FLAG_CODED;
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ft->size_mul=1;
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ft->pts_delta=1;
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start++;
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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_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
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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*key_frame;
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ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS;
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ft->stream_id= stream_id;
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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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int pts;
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for(pts=0; pts<2; 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*key_frame;
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ft->stream_id= stream_id;
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ft->size_mul=frame_bytes + 2;
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ft->size_lsb=frame_bytes + pred;
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ft->pts_delta=pts;
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start2++;
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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 | FLAG_SIZE_MSB;
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ft->stream_id= stream_id;
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ft->size_mul=1;
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ft->pts_delta=1;
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start2++;
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}
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#endif
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if(codec->has_b_frames){
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pred_count=5;
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pred_table[0]=-2;
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pred_table[1]=-1;
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pred_table[2]=1;
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pred_table[3]=3;
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pred_table[4]=4;
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}else if(codec->codec_id == CODEC_ID_VORBIS){
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pred_count=3;
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pred_table[0]=2;
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pred_table[1]=9;
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pred_table[2]=16;
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}else{
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pred_count=1;
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pred_table[0]=1;
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}
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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*key_frame;
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ft->flags|= FLAG_SIZE_MSB;
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ft->stream_id= stream_id;
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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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ft->pts_delta= pred_table[pred];
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}
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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[ 0].flags=
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nut->frame_code[255].flags=
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nut->frame_code['N'].flags= FLAG_INVALID;
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}
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/**
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* Gets the length in bytes which is needed to store val as v.
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*/
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static int get_length(uint64_t val){
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int i=1;
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while(val>>=7)
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i++;
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return i;
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}
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static void put_v(ByteIOContext *bc, uint64_t val){
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int i= get_length(val);
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while(--i>0)
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put_byte(bc, 128 | (val>>(7*i)));
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put_byte(bc, val&127);
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}
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static void put_t(NUTContext *nut, StreamContext *nus, ByteIOContext *bc, uint64_t val){
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val *= nut->time_base_count;
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val += nus->time_base - nut->time_base;
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put_v(bc, val);
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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_s(ByteIOContext *bc, int64_t val){
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put_v(bc, 2*FFABS(val) - (val>0));
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}
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#ifdef TRACE
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static inline void put_v_trace(ByteIOContext *bc, uint64_t v, char *file, char *func, int line){
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av_log(NULL, AV_LOG_DEBUG, "put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
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put_v(bc, v);
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}
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static inline void put_s_trace(ByteIOContext *bc, int64_t v, char *file, char *func, int line){
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av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
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put_s(bc, v);
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}
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#define put_v(bc, v) put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
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#define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
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#endif
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//FIXME remove calculate_checksum
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static void put_packet(NUTContext *nut, ByteIOContext *bc, ByteIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){
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uint8_t *dyn_buf=NULL;
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int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
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int forw_ptr= dyn_size + 4*calculate_checksum;
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if(forw_ptr > 4096)
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init_checksum(bc, ff_crc04C11DB7_update, 0);
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put_be64(bc, startcode);
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put_v(bc, forw_ptr);
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if(forw_ptr > 4096)
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put_le32(bc, get_checksum(bc));
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if(calculate_checksum)
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init_checksum(bc, ff_crc04C11DB7_update, 0);
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put_buffer(bc, dyn_buf, dyn_size);
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if(calculate_checksum)
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put_le32(bc, get_checksum(bc));
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av_free(dyn_buf);
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}
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static void write_mainheader(NUTContext *nut, ByteIOContext *bc){
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int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields;
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put_v(bc, 3); /* version */
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put_v(bc, nut->avf->nb_streams);
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put_v(bc, MAX_DISTANCE);
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put_v(bc, nut->time_base_count);
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for(i=0; i<nut->time_base_count; i++){
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put_v(bc, nut->time_base[i].num);
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put_v(bc, nut->time_base[i].den);
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}
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tmp_pts=0;
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tmp_mul=1;
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tmp_stream=0;
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for(i=0; i<256;){
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tmp_fields=0;
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tmp_size=0;
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// tmp_res=0;
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if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1;
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if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
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if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3;
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if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
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// if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
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tmp_pts = nut->frame_code[i].pts_delta;
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tmp_flags = nut->frame_code[i].flags;
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tmp_stream= nut->frame_code[i].stream_id;
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tmp_mul = nut->frame_code[i].size_mul;
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tmp_size = nut->frame_code[i].size_lsb;
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// tmp_res = nut->frame_code[i].res;
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for(j=0; i<256; j++,i++){
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if(i == 'N'){
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j--;
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continue;
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}
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if(nut->frame_code[i].pts_delta != tmp_pts ) break;
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if(nut->frame_code[i].flags != tmp_flags ) break;
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if(nut->frame_code[i].stream_id != 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+j) break;
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// if(nut->frame_code[i].res != tmp_res ) break;
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}
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if(j != tmp_mul - tmp_size) tmp_fields=6;
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put_v(bc, tmp_flags);
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put_v(bc, tmp_fields);
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if(tmp_fields>0) put_s(bc, tmp_pts);
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if(tmp_fields>1) put_v(bc, tmp_mul);
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if(tmp_fields>2) put_v(bc, tmp_stream);
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if(tmp_fields>3) put_v(bc, tmp_size);
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if(tmp_fields>4) put_v(bc, 0 /*tmp_res*/);
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if(tmp_fields>5) put_v(bc, j);
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}
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}
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static int write_streamheader(NUTContext *nut, ByteIOContext *bc, AVCodecContext *codec, int i){
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put_v(bc, i);
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switch(codec->codec_type){
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case CODEC_TYPE_VIDEO: put_v(bc, 0); break;
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case CODEC_TYPE_AUDIO: put_v(bc, 1); break;
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// case CODEC_TYPE_TEXT : put_v(bc, 2); break;
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default : put_v(bc, 3); break;
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}
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put_v(bc, 4);
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if (codec->codec_tag){
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put_le32(bc, codec->codec_tag);
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}else
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return -1;
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put_v(bc, nut->stream[i].time_base - nut->time_base);
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put_v(bc, nut->stream[i].msb_pts_shift);
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put_v(bc, nut->stream[i].max_pts_distance);
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put_v(bc, codec->has_b_frames);
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put_byte(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
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put_v(bc, codec->extradata_size);
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put_buffer(bc, codec->extradata, codec->extradata_size);
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switch(codec->codec_type){
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case CODEC_TYPE_AUDIO:
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put_v(bc, codec->sample_rate);
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put_v(bc, 1);
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put_v(bc, codec->channels);
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break;
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case CODEC_TYPE_VIDEO:
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put_v(bc, codec->width);
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put_v(bc, codec->height);
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if(codec->sample_aspect_ratio.num<=0 || codec->sample_aspect_ratio.den<=0){
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put_v(bc, 0);
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put_v(bc, 0);
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}else{
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put_v(bc, codec->sample_aspect_ratio.num);
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put_v(bc, codec->sample_aspect_ratio.den);
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}
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put_v(bc, 0); /* csp type -- unknown */
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break;
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default:
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break;
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}
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return 0;
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}
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static int add_info(ByteIOContext *bc, char *type, char *value){
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put_str(bc, type);
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put_s(bc, -1);
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put_str(bc, value);
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return 1;
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}
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static int write_globalinfo(NUTContext *nut, ByteIOContext *bc){
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AVFormatContext *s= nut->avf;
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ByteIOContext *dyn_bc;
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uint8_t *dyn_buf=NULL;
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int count=0, dyn_size;
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int ret = url_open_dyn_buf(&dyn_bc);
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if(ret < 0)
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return ret;
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if(s->title [0]) count+= add_info(dyn_bc, "Title" , s->title);
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if(s->author [0]) count+= add_info(dyn_bc, "Author" , s->author);
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if(s->copyright[0]) count+= add_info(dyn_bc, "Copyright", s->copyright);
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if(!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT))
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count+= add_info(dyn_bc, "Encoder" , LIBAVFORMAT_IDENT);
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put_v(bc, 0); //stream_if_plus1
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put_v(bc, 0); //chapter_id
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put_v(bc, 0); //timestamp_start
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put_v(bc, 0); //length
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put_v(bc, count);
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dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
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put_buffer(bc, dyn_buf, dyn_size);
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av_free(dyn_buf);
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return 0;
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}
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static int write_headers(NUTContext *nut, ByteIOContext *bc){
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ByteIOContext *dyn_bc;
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int i, ret;
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ret = url_open_dyn_buf(&dyn_bc);
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if(ret < 0)
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return ret;
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write_mainheader(nut, dyn_bc);
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put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
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for (i=0; i < nut->avf->nb_streams; i++){
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AVCodecContext *codec = nut->avf->streams[i]->codec;
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ret = url_open_dyn_buf(&dyn_bc);
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if(ret < 0)
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return ret;
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write_streamheader(nut, dyn_bc, codec, i);
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put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
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}
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ret = url_open_dyn_buf(&dyn_bc);
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if(ret < 0)
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return ret;
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write_globalinfo(nut, dyn_bc);
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put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
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nut->last_syncpoint_pos= INT_MIN;
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nut->header_count++;
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return 0;
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}
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static int write_header(AVFormatContext *s){
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NUTContext *nut = s->priv_data;
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ByteIOContext *bc = s->pb;
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int i, j;
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nut->avf= s;
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nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams);
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nut->time_base= av_mallocz(sizeof(AVRational )*s->nb_streams);
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for(i=0; i<s->nb_streams; i++){
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AVStream *st= s->streams[i];
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int ssize;
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AVRational time_base;
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ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
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av_set_pts_info(st, 64, time_base.num, time_base.den);
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for(j=0; j<nut->time_base_count; j++){
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if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
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break;
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}
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}
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nut->time_base[j]= time_base;
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nut->stream[i].time_base= &nut->time_base[j];
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if(j==nut->time_base_count)
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nut->time_base_count++;
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if(av_q2d(time_base) >= 0.001)
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nut->stream[i].msb_pts_shift = 7;
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else
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nut->stream[i].msb_pts_shift = 14;
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nut->stream[i].max_pts_distance= FFMAX(1/av_q2d(time_base), 1);
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}
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build_frame_code(s);
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assert(nut->frame_code['N'].flags == FLAG_INVALID);
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put_buffer(bc, ID_STRING, strlen(ID_STRING));
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put_byte(bc, 0);
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write_headers(nut, bc);
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put_flush_packet(bc);
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//FIXME index
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return 0;
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}
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static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
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int flags= 0;
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if(pkt->flags & PKT_FLAG_KEY ) flags |= FLAG_KEY;
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if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID;
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if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB;
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if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
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if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM;
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if(FFABS(pkt->pts - nus->last_pts)
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> nus->max_pts_distance) flags |= FLAG_CHECKSUM;
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return flags | (fc->flags & FLAG_CODED);
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}
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static int write_packet(AVFormatContext *s, AVPacket *pkt){
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NUTContext *nut = s->priv_data;
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StreamContext *nus= &nut->stream[pkt->stream_index];
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ByteIOContext *bc = s->pb, *dyn_bc;
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FrameCode *fc;
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int64_t coded_pts;
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int best_length, frame_code, flags, needed_flags, i;
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int key_frame = !!(pkt->flags & PKT_FLAG_KEY);
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int store_sp=0;
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int ret;
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if(1LL<<(20+3*nut->header_count) <= url_ftell(bc))
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write_headers(nut, bc);
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if(key_frame && !!(nus->last_flags & FLAG_KEY))
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store_sp= 1;
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|
if(pkt->size + 30/*FIXME check*/ + url_ftell(bc) >= nut->last_syncpoint_pos + nut->max_distance)
|
|
store_sp= 1;
|
|
|
|
//FIXME: Ensure store_sp is 1 in the first place.
|
|
|
|
if(store_sp){
|
|
syncpoint_t *sp, dummy= {.pos= INT64_MAX};
|
|
|
|
ff_nut_reset_ts(nut, *nus->time_base, pkt->dts);
|
|
for(i=0; i<s->nb_streams; i++){
|
|
AVStream *st= s->streams[i];
|
|
int index= av_index_search_timestamp(st, pkt->dts, AVSEEK_FLAG_BACKWARD);
|
|
if(index>=0) dummy.pos= FFMIN(dummy.pos, st->index_entries[index].pos);
|
|
}
|
|
if(dummy.pos == INT64_MAX)
|
|
dummy.pos= 0;
|
|
sp= av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp, NULL);
|
|
|
|
nut->last_syncpoint_pos= url_ftell(bc);
|
|
ret = url_open_dyn_buf(&dyn_bc);
|
|
if(ret < 0)
|
|
return ret;
|
|
put_t(nut, nus, dyn_bc, pkt->dts);
|
|
put_v(dyn_bc, sp ? (nut->last_syncpoint_pos - sp->pos)>>4 : 0);
|
|
put_packet(nut, bc, dyn_bc, 1, SYNCPOINT_STARTCODE);
|
|
|
|
ff_nut_add_sp(nut, nut->last_syncpoint_pos, 0/*unused*/, pkt->dts);
|
|
}
|
|
assert(nus->last_pts != AV_NOPTS_VALUE);
|
|
|
|
coded_pts = pkt->pts & ((1<<nus->msb_pts_shift)-1);
|
|
if(ff_lsb2full(nus, coded_pts) != pkt->pts)
|
|
coded_pts= pkt->pts + (1<<nus->msb_pts_shift);
|
|
|
|
best_length=INT_MAX;
|
|
frame_code= -1;
|
|
for(i=0; i<256; i++){
|
|
int length= 0;
|
|
FrameCode *fc= &nut->frame_code[i];
|
|
int flags= fc->flags;
|
|
|
|
if(flags & FLAG_INVALID)
|
|
continue;
|
|
needed_flags= get_needed_flags(nut, nus, fc, pkt);
|
|
|
|
if(flags & FLAG_CODED){
|
|
length++;
|
|
flags = needed_flags;
|
|
}
|
|
|
|
if((flags & needed_flags) != needed_flags)
|
|
continue;
|
|
|
|
if((flags ^ needed_flags) & FLAG_KEY)
|
|
continue;
|
|
|
|
if(flags & FLAG_STREAM_ID)
|
|
length+= get_length(pkt->stream_index);
|
|
|
|
if(pkt->size % fc->size_mul != fc->size_lsb)
|
|
continue;
|
|
if(flags & FLAG_SIZE_MSB)
|
|
length += get_length(pkt->size / fc->size_mul);
|
|
|
|
if(flags & FLAG_CHECKSUM)
|
|
length+=4;
|
|
|
|
if(flags & FLAG_CODED_PTS)
|
|
length += get_length(coded_pts);
|
|
|
|
length*=4;
|
|
length+= !(flags & FLAG_CODED_PTS);
|
|
length+= !(flags & FLAG_CHECKSUM);
|
|
|
|
if(length < best_length){
|
|
best_length= length;
|
|
frame_code=i;
|
|
}
|
|
}
|
|
assert(frame_code != -1);
|
|
fc= &nut->frame_code[frame_code];
|
|
flags= fc->flags;
|
|
needed_flags= get_needed_flags(nut, nus, fc, pkt);
|
|
|
|
init_checksum(bc, ff_crc04C11DB7_update, 0);
|
|
put_byte(bc, frame_code);
|
|
if(flags & FLAG_CODED){
|
|
put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
|
|
flags = needed_flags;
|
|
}
|
|
if(flags & FLAG_STREAM_ID) put_v(bc, pkt->stream_index);
|
|
if(flags & FLAG_CODED_PTS) put_v(bc, coded_pts);
|
|
if(flags & FLAG_SIZE_MSB) put_v(bc, pkt->size / fc->size_mul);
|
|
|
|
if(flags & FLAG_CHECKSUM) put_le32(bc, get_checksum(bc));
|
|
else get_checksum(bc);
|
|
|
|
put_buffer(bc, pkt->data, pkt->size);
|
|
nus->last_flags= flags;
|
|
|
|
//FIXME just store one per syncpoint
|
|
if(flags & FLAG_KEY)
|
|
av_add_index_entry(
|
|
s->streams[pkt->stream_index],
|
|
nut->last_syncpoint_pos,
|
|
pkt->pts,
|
|
0,
|
|
0,
|
|
AVINDEX_KEYFRAME);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int write_trailer(AVFormatContext *s){
|
|
NUTContext *nut= s->priv_data;
|
|
ByteIOContext *bc= s->pb;
|
|
|
|
while(nut->header_count<3)
|
|
write_headers(nut, bc);
|
|
put_flush_packet(bc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat nut_muxer = {
|
|
"nut",
|
|
"nut format",
|
|
"video/x-nut",
|
|
"nut",
|
|
sizeof(NUTContext),
|
|
#ifdef CONFIG_LIBVORBIS
|
|
CODEC_ID_VORBIS,
|
|
#elif defined(CONFIG_LIBMP3LAME)
|
|
CODEC_ID_MP3,
|
|
#else
|
|
CODEC_ID_MP2, /* AC3 needs liba52 decoder */
|
|
#endif
|
|
CODEC_ID_MPEG4,
|
|
write_header,
|
|
write_packet,
|
|
write_trailer,
|
|
.flags = AVFMT_GLOBALHEADER,
|
|
.codec_tag= (const AVCodecTag*[]){codec_bmp_tags, codec_wav_tags, 0},
|
|
};
|