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388 lines
12 KiB
388 lines
12 KiB
/* |
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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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#define TRACE |
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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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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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/** |
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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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printf("get_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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printf("get_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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static void put_packet(NUTContext *nut, ByteIOContext *bc, ByteIOContext *dyn_bc, int calculate_checksum){ |
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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, av_crc04C11DB7_update, 0); |
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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, av_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, 2); /* 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)/sizeof(AVRational)); |
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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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put_v(bc, codec->sample_aspect_ratio.num); |
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put_v(bc, codec->sample_aspect_ratio.den); |
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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 write_header(AVFormatContext *s){ |
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NUTContext *nut = s->priv_data; |
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ByteIOContext *bc = &s->pb, dyn_bc; |
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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 = 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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/* main header */ |
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put_be64(bc, MAIN_STARTCODE); |
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url_open_dyn_buf(&dyn_bc); |
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write_mainheader(nut, &dyn_bc); |
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put_packet(nut, bc, &dyn_bc, 1); |
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for (i=0; i < s->nb_streams; i++){ |
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codec = s->streams[i]->codec; |
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put_be64(bc, STREAM_STARTCODE); |
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url_open_dyn_buf(&dyn_bc); |
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write_streamheader(nut, &dyn_bc, codec, i); |
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put_packet(nut, bc, &dyn_bc, 1); |
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} |
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put_flush_packet(bc); |
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//FIXME info header, header repeation, ... |
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return 0; |
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} |
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static int write_packet(AVFormatContext *s, AVPacket *pkt){ |
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//FIXME |
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return 0; |
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} |
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AVOutputFormat nut_muxer = { |
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"nut", |
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"nut format", |
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"video/x-nut", |
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"nut", |
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sizeof(NUTContext), |
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#ifdef CONFIG_LIBVORBIS |
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CODEC_ID_VORBIS, |
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#elif defined(CONFIG_LIBMP3LAME) |
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CODEC_ID_MP3, |
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#else |
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CODEC_ID_MP2, /* AC3 needs liba52 decoder */ |
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#endif |
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CODEC_ID_MPEG4, |
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write_header, |
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write_packet, |
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// write_trailer, |
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.flags = AVFMT_GLOBALHEADER, |
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.codec_tag= (const AVCodecTag*[]){codec_bmp_tags, codec_wav_tags, 0}, |
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};
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