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ffmpeg/libavformat/nutenc.c
Michael Niedermayer 1caa4123bd Merge remote-tracking branch 'newdev/master' 
* newdev/master:
  rtsp: Use GET_PARAMETER for keep-alive for generic RTSP servers
  mlp_parse.c: set AVCodecContext channel_layout
  APIChanges: mark the place where 0.6 was branched.
  avio: make get_checksum() internal.
  avio: move ff_crc04C11DB7_update() from avio.h -> avio_internal.h
  avio: make init_checksum() internal.
NOT MERGED  Add MxPEG decoder
NOT MERGED  Add support for picture_ptr field in MJpegDecodeContext
NOT MERGED  Move MJPEG's input buffer preprocessing in separate public function
NOT MERGED  Support reference picture defined by bitmask in MJPEG's SOS decoder
  sndio bug fix

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2011-03-31 12:48:41 +02:00

876 lines
28 KiB
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/*
* nut muxer
* Copyright (c) 2004-2007 Michael Niedermayer
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "libavutil/tree.h"
#include "libavcodec/mpegaudiodata.h"
#include "nut.h"
#include "internal.h"
#include "avio_internal.h"
static int find_expected_header(AVCodecContext *c, int size, int key_frame, uint8_t out[64]){
int sample_rate= c->sample_rate;
if(size>4096)
return 0;
AV_WB24(out, 1);
if(c->codec_id == CODEC_ID_MPEG4){
if(key_frame){
return 3;
}else{
out[3]= 0xB6;
return 4;
}
}else if(c->codec_id == CODEC_ID_MPEG1VIDEO || c->codec_id == CODEC_ID_MPEG2VIDEO){
return 3;
}else if(c->codec_id == CODEC_ID_H264){
return 3;
}else if(c->codec_id == CODEC_ID_MP3 || c->codec_id == CODEC_ID_MP2){
int lsf, mpeg25, sample_rate_index, bitrate_index, frame_size;
int layer= c->codec_id == CODEC_ID_MP3 ? 3 : 2;
unsigned int header= 0xFFF00000;
lsf = sample_rate < (24000+32000)/2;
mpeg25 = sample_rate < (12000+16000)/2;
sample_rate <<= lsf + mpeg25;
if (sample_rate < (32000 + 44100)/2) sample_rate_index=2;
else if(sample_rate < (44100 + 48000)/2) sample_rate_index=0;
else sample_rate_index=1;
sample_rate= ff_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25);
for(bitrate_index=2; bitrate_index<30; bitrate_index++){
frame_size = ff_mpa_bitrate_tab[lsf][layer-1][bitrate_index>>1];
frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1);
if(frame_size == size)
break;
}
header |= (!lsf)<<19;
header |= (4-layer)<<17;
header |= 1<<16; //no crc
AV_WB32(out, header);
if(size <= 0)
return 2; //we guess there is no crc, if there is one the user clearly does not care about overhead
if(bitrate_index == 30)
return -1; //something is wrong ...
header |= (bitrate_index>>1)<<12;
header |= sample_rate_index<<10;
header |= (bitrate_index&1)<<9;
return 2; //FIXME actually put the needed ones in build_elision_headers()
return 3; //we guess that the private bit is not set
//FIXME the above assumptions should be checked, if these turn out false too often something should be done
}
return 0;
}
static int find_header_idx(AVFormatContext *s, AVCodecContext *c, int size, int frame_type){
NUTContext *nut = s->priv_data;
uint8_t out[64];
int i;
int len= find_expected_header(c, size, frame_type, out);
//av_log(NULL, AV_LOG_ERROR, "expected_h len=%d size=%d codec_id=%d\n", len, size, c->codec_id);
for(i=1; i<nut->header_count; i++){
if( len == nut->header_len[i]
&& !memcmp(out, nut->header[i], len)){
// av_log(NULL, AV_LOG_ERROR, "found %d\n", i);
return i;
}
}
// av_log(NULL, AV_LOG_ERROR, "nothing found\n");
return 0;
}
static void build_elision_headers(AVFormatContext *s){
NUTContext *nut = s->priv_data;
int i;
//FIXME this is lame
//FIXME write a 2pass mode to find the maximal headers
static const uint8_t headers[][5]={
{3, 0x00, 0x00, 0x01},
{4, 0x00, 0x00, 0x01, 0xB6},
{2, 0xFF, 0xFA}, //mp3+crc
{2, 0xFF, 0xFB}, //mp3
{2, 0xFF, 0xFC}, //mp2+crc
{2, 0xFF, 0xFD}, //mp2
};
nut->header_count= 7;
for(i=1; i<nut->header_count; i++){
nut->header_len[i]= headers[i-1][0];
nut->header [i]= &headers[i-1][1];
}
}
static void build_frame_code(AVFormatContext *s){
NUTContext *nut = s->priv_data;
int key_frame, index, pred, stream_id;
int start=1;
int end= 254;
int keyframe_0_esc= s->nb_streams > 2;
int pred_table[10];
FrameCode *ft;
ft= &nut->frame_code[start];
ft->flags= FLAG_CODED;
ft->size_mul=1;
ft->pts_delta=1;
start++;
if(keyframe_0_esc){
/* keyframe = 0 escape */
FrameCode *ft= &nut->frame_code[start];
ft->flags= FLAG_STREAM_ID | FLAG_SIZE_MSB | FLAG_CODED_PTS;
ft->size_mul=1;
start++;
}
for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
int start2= start + (end-start)*stream_id / s->nb_streams;
int end2 = start + (end-start)*(stream_id+1) / s->nb_streams;
AVCodecContext *codec = s->streams[stream_id]->codec;
int is_audio= codec->codec_type == AVMEDIA_TYPE_AUDIO;
int intra_only= /*codec->intra_only || */is_audio;
int pred_count;
for(key_frame=0; key_frame<2; key_frame++){
if(intra_only && keyframe_0_esc && key_frame==0)
continue;
{
FrameCode *ft= &nut->frame_code[start2];
ft->flags= FLAG_KEY*key_frame;
ft->flags|= FLAG_SIZE_MSB | FLAG_CODED_PTS;
ft->stream_id= stream_id;
ft->size_mul=1;
if(is_audio)
ft->header_idx= find_header_idx(s, codec, -1, key_frame);
start2++;
}
}
key_frame= intra_only;
#if 1
if(is_audio){
int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
int pts;
for(pts=0; pts<2; pts++){
for(pred=0; pred<2; pred++){
FrameCode *ft= &nut->frame_code[start2];
ft->flags= FLAG_KEY*key_frame;
ft->stream_id= stream_id;
ft->size_mul=frame_bytes + 2;
ft->size_lsb=frame_bytes + pred;
ft->pts_delta=pts;
ft->header_idx= find_header_idx(s, codec, frame_bytes + pred, key_frame);
start2++;
}
}
}else{
FrameCode *ft= &nut->frame_code[start2];
ft->flags= FLAG_KEY | FLAG_SIZE_MSB;
ft->stream_id= stream_id;
ft->size_mul=1;
ft->pts_delta=1;
start2++;
}
#endif
if(codec->has_b_frames){
pred_count=5;
pred_table[0]=-2;
pred_table[1]=-1;
pred_table[2]=1;
pred_table[3]=3;
pred_table[4]=4;
}else if(codec->codec_id == CODEC_ID_VORBIS){
pred_count=3;
pred_table[0]=2;
pred_table[1]=9;
pred_table[2]=16;
}else{
pred_count=1;
pred_table[0]=1;
}
for(pred=0; pred<pred_count; pred++){
int start3= start2 + (end2-start2)*pred / pred_count;
int end3 = start2 + (end2-start2)*(pred+1) / pred_count;
for(index=start3; index<end3; index++){
FrameCode *ft= &nut->frame_code[index];
ft->flags= FLAG_KEY*key_frame;
ft->flags|= FLAG_SIZE_MSB;
ft->stream_id= stream_id;
//FIXME use single byte size and pred from last
ft->size_mul= end3-start3;
ft->size_lsb= index - start3;
ft->pts_delta= pred_table[pred];
if(is_audio)
ft->header_idx= find_header_idx(s, codec, -1, key_frame);
}
}
}
memmove(&nut->frame_code['N'+1], &nut->frame_code['N'], sizeof(FrameCode)*(255-'N'));
nut->frame_code[ 0].flags=
nut->frame_code[255].flags=
nut->frame_code['N'].flags= FLAG_INVALID;
}
static void put_tt(NUTContext *nut, AVRational *time_base, AVIOContext *bc, uint64_t val){
val *= nut->time_base_count;
val += time_base - nut->time_base;
ff_put_v(bc, val);
}
/**
* Store a string as vb.
*/
static void put_str(AVIOContext *bc, const char *string){
int len= strlen(string);
ff_put_v(bc, len);
avio_write(bc, string, len);
}
static void put_s(AVIOContext *bc, int64_t val){
ff_put_v(bc, 2*FFABS(val) - (val>0));
}
#ifdef TRACE
static inline void ff_put_v_trace(AVIOContext *bc, uint64_t v, char *file, char *func, int line){
av_log(NULL, AV_LOG_DEBUG, "ff_put_v %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
ff_put_v(bc, v);
}
static inline void put_s_trace(AVIOContext *bc, int64_t v, char *file, char *func, int line){
av_log(NULL, AV_LOG_DEBUG, "put_s %5"PRId64" / %"PRIX64" in %s %s:%d\n", v, v, file, func, line);
put_s(bc, v);
}
#define ff_put_v(bc, v) ff_put_v_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
#define put_s(bc, v) put_s_trace(bc, v, __FILE__, __PRETTY_FUNCTION__, __LINE__)
#endif
//FIXME remove calculate_checksum
static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){
uint8_t *dyn_buf=NULL;
int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
int forw_ptr= dyn_size + 4*calculate_checksum;
if(forw_ptr > 4096)
ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
avio_wb64(bc, startcode);
ff_put_v(bc, forw_ptr);
if(forw_ptr > 4096)
avio_wl32(bc, ffio_get_checksum(bc));
if(calculate_checksum)
ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
avio_write(bc, dyn_buf, dyn_size);
if(calculate_checksum)
avio_wl32(bc, ffio_get_checksum(bc));
av_free(dyn_buf);
}
static void write_mainheader(NUTContext *nut, AVIOContext *bc){
int i, j, tmp_pts, tmp_flags, tmp_stream, tmp_mul, tmp_size, tmp_fields, tmp_head_idx;
int64_t tmp_match;
ff_put_v(bc, 3); /* version */
ff_put_v(bc, nut->avf->nb_streams);
ff_put_v(bc, nut->max_distance);
ff_put_v(bc, nut->time_base_count);
for(i=0; i<nut->time_base_count; i++){
ff_put_v(bc, nut->time_base[i].num);
ff_put_v(bc, nut->time_base[i].den);
}
tmp_pts=0;
tmp_mul=1;
tmp_stream=0;
tmp_match= 1-(1LL<<62);
tmp_head_idx= 0;
for(i=0; i<256;){
tmp_fields=0;
tmp_size=0;
// tmp_res=0;
if(tmp_pts != nut->frame_code[i].pts_delta) tmp_fields=1;
if(tmp_mul != nut->frame_code[i].size_mul ) tmp_fields=2;
if(tmp_stream != nut->frame_code[i].stream_id) tmp_fields=3;
if(tmp_size != nut->frame_code[i].size_lsb ) tmp_fields=4;
// if(tmp_res != nut->frame_code[i].res ) tmp_fields=5;
if(tmp_head_idx!=nut->frame_code[i].header_idx)tmp_fields=8;
tmp_pts = nut->frame_code[i].pts_delta;
tmp_flags = nut->frame_code[i].flags;
tmp_stream= nut->frame_code[i].stream_id;
tmp_mul = nut->frame_code[i].size_mul;
tmp_size = nut->frame_code[i].size_lsb;
// tmp_res = nut->frame_code[i].res;
tmp_head_idx= nut->frame_code[i].header_idx;
for(j=0; i<256; j++,i++){
if(i == 'N'){
j--;
continue;
}
if(nut->frame_code[i].pts_delta != tmp_pts ) break;
if(nut->frame_code[i].flags != tmp_flags ) break;
if(nut->frame_code[i].stream_id != tmp_stream) break;
if(nut->frame_code[i].size_mul != tmp_mul ) break;
if(nut->frame_code[i].size_lsb != tmp_size+j) break;
// if(nut->frame_code[i].res != tmp_res ) break;
if(nut->frame_code[i].header_idx!= tmp_head_idx) break;
}
if(j != tmp_mul - tmp_size) tmp_fields=6;
ff_put_v(bc, tmp_flags);
ff_put_v(bc, tmp_fields);
if(tmp_fields>0) put_s(bc, tmp_pts);
if(tmp_fields>1) ff_put_v(bc, tmp_mul);
if(tmp_fields>2) ff_put_v(bc, tmp_stream);
if(tmp_fields>3) ff_put_v(bc, tmp_size);
if(tmp_fields>4) ff_put_v(bc, 0 /*tmp_res*/);
if(tmp_fields>5) ff_put_v(bc, j);
if(tmp_fields>6) ff_put_v(bc, tmp_match);
if(tmp_fields>7) ff_put_v(bc, tmp_head_idx);
}
ff_put_v(bc, nut->header_count-1);
for(i=1; i<nut->header_count; i++){
ff_put_v(bc, nut->header_len[i]);
avio_write(bc, nut->header[i], nut->header_len[i]);
}
}
static int write_streamheader(AVFormatContext *avctx, AVIOContext *bc, AVStream *st, int i){
NUTContext *nut = avctx->priv_data;
AVCodecContext *codec = st->codec;
ff_put_v(bc, i);
switch(codec->codec_type){
case AVMEDIA_TYPE_VIDEO: ff_put_v(bc, 0); break;
case AVMEDIA_TYPE_AUDIO: ff_put_v(bc, 1); break;
case AVMEDIA_TYPE_SUBTITLE: ff_put_v(bc, 2); break;
default : ff_put_v(bc, 3); break;
}
ff_put_v(bc, 4);
if (codec->codec_tag){
avio_wl32(bc, codec->codec_tag);
} else {
av_log(avctx, AV_LOG_ERROR, "No codec tag defined for stream %d\n", i);
return AVERROR(EINVAL);
}
ff_put_v(bc, nut->stream[i].time_base - nut->time_base);
ff_put_v(bc, nut->stream[i].msb_pts_shift);
ff_put_v(bc, nut->stream[i].max_pts_distance);
ff_put_v(bc, codec->has_b_frames);
avio_w8(bc, 0); /* flags: 0x1 - fixed_fps, 0x2 - index_present */
ff_put_v(bc, codec->extradata_size);
avio_write(bc, codec->extradata, codec->extradata_size);
switch(codec->codec_type){
case AVMEDIA_TYPE_AUDIO:
ff_put_v(bc, codec->sample_rate);
ff_put_v(bc, 1);
ff_put_v(bc, codec->channels);
break;
case AVMEDIA_TYPE_VIDEO:
ff_put_v(bc, codec->width);
ff_put_v(bc, codec->height);
if(st->sample_aspect_ratio.num<=0 || st->sample_aspect_ratio.den<=0){
ff_put_v(bc, 0);
ff_put_v(bc, 0);
}else{
ff_put_v(bc, st->sample_aspect_ratio.num);
ff_put_v(bc, st->sample_aspect_ratio.den);
}
ff_put_v(bc, 0); /* csp type -- unknown */
break;
default:
break;
}
return 0;
}
static int add_info(AVIOContext *bc, const char *type, const char *value){
put_str(bc, type);
put_s(bc, -1);
put_str(bc, value);
return 1;
}
static int write_globalinfo(NUTContext *nut, AVIOContext *bc){
AVFormatContext *s= nut->avf;
AVMetadataTag *t = NULL;
AVIOContext *dyn_bc;
uint8_t *dyn_buf=NULL;
int count=0, dyn_size;
int ret = url_open_dyn_buf(&dyn_bc);
if(ret < 0)
return ret;
while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX)))
count += add_info(dyn_bc, t->key, t->value);
ff_put_v(bc, 0); //stream_if_plus1
ff_put_v(bc, 0); //chapter_id
ff_put_v(bc, 0); //timestamp_start
ff_put_v(bc, 0); //length
ff_put_v(bc, count);
dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
avio_write(bc, dyn_buf, dyn_size);
av_free(dyn_buf);
return 0;
}
static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){
AVFormatContext *s= nut->avf;
AVStream* st = s->streams[stream_id];
AVIOContext *dyn_bc;
uint8_t *dyn_buf=NULL;
int count=0, dyn_size, i;
int ret = url_open_dyn_buf(&dyn_bc);
if(ret < 0)
return ret;
for (i=0; ff_nut_dispositions[i].flag; ++i) {
if (st->disposition & ff_nut_dispositions[i].flag)
count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
}
dyn_size = url_close_dyn_buf(dyn_bc, &dyn_buf);
if (count) {
ff_put_v(bc, stream_id + 1); //stream_id_plus1
ff_put_v(bc, 0); //chapter_id
ff_put_v(bc, 0); //timestamp_start
ff_put_v(bc, 0); //length
ff_put_v(bc, count);
avio_write(bc, dyn_buf, dyn_size);
}
av_free(dyn_buf);
return count;
}
static int write_chapter(NUTContext *nut, AVIOContext *bc, int id)
{
AVIOContext *dyn_bc;
uint8_t *dyn_buf = NULL;
AVMetadataTag *t = NULL;
AVChapter *ch = nut->avf->chapters[id];
int ret, dyn_size, count = 0;
ret = url_open_dyn_buf(&dyn_bc);
if (ret < 0)
return ret;
ff_put_v(bc, 0); // stream_id_plus1
put_s(bc, id + 1); // chapter_id
put_tt(nut, nut->chapter[id].time_base, bc, ch->start); // chapter_start
ff_put_v(bc, ch->end - ch->start); // chapter_len
while ((t = av_metadata_get(ch->metadata, "", t, AV_METADATA_IGNORE_SUFFIX)))
count += add_info(dyn_bc, t->key, t->value);
ff_put_v(bc, count);
dyn_size = url_close_dyn_buf(dyn_bc, &dyn_buf);
avio_write(bc, dyn_buf, dyn_size);
av_freep(&dyn_buf);
return 0;
}
static int write_headers(AVFormatContext *avctx, AVIOContext *bc){
NUTContext *nut = avctx->priv_data;
AVIOContext *dyn_bc;
int i, ret;
ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);
ret = url_open_dyn_buf(&dyn_bc);
if(ret < 0)
return ret;
write_mainheader(nut, dyn_bc);
put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
for (i=0; i < nut->avf->nb_streams; i++){
ret = url_open_dyn_buf(&dyn_bc);
if(ret < 0)
return ret;
if ((ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i)) < 0)
return ret;
put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
}
ret = url_open_dyn_buf(&dyn_bc);
if(ret < 0)
return ret;
write_globalinfo(nut, dyn_bc);
put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
for (i = 0; i < nut->avf->nb_streams; i++) {
ret = url_open_dyn_buf(&dyn_bc);
if(ret < 0)
return ret;
ret = write_streaminfo(nut, dyn_bc, i);
if (ret < 0)
return ret;
if (ret > 0)
put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
else {
uint8_t* buf;
url_close_dyn_buf(dyn_bc, &buf);
av_free(buf);
}
}
for (i = 0; i < nut->avf->nb_chapters; i++) {
ret = url_open_dyn_buf(&dyn_bc);
if (ret < 0)
return ret;
ret = write_chapter(nut, dyn_bc, i);
if (ret < 0) {
uint8_t *buf;
url_close_dyn_buf(dyn_bc, &buf);
av_freep(&buf);
return ret;
}
put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
}
nut->last_syncpoint_pos= INT_MIN;
nut->header_count++;
return 0;
}
static int write_header(AVFormatContext *s){
NUTContext *nut = s->priv_data;
AVIOContext *bc = s->pb;
int i, j, ret;
nut->avf= s;
nut->stream = av_mallocz(sizeof(StreamContext)*s->nb_streams);
nut->chapter = av_mallocz(sizeof(ChapterContext)*s->nb_chapters);
nut->time_base= av_mallocz(sizeof(AVRational )*(s->nb_streams +
s->nb_chapters));
for(i=0; i<s->nb_streams; i++){
AVStream *st= s->streams[i];
int ssize;
AVRational time_base;
ff_parse_specific_params(st->codec, &time_base.den, &ssize, &time_base.num);
av_set_pts_info(st, 64, time_base.num, time_base.den);
for(j=0; j<nut->time_base_count; j++){
if(!memcmp(&time_base, &nut->time_base[j], sizeof(AVRational))){
break;
}
}
nut->time_base[j]= time_base;
nut->stream[i].time_base= &nut->time_base[j];
if(j==nut->time_base_count)
nut->time_base_count++;
if(INT64_C(1000) * time_base.num >= time_base.den)
nut->stream[i].msb_pts_shift = 7;
else
nut->stream[i].msb_pts_shift = 14;
nut->stream[i].max_pts_distance= FFMAX(time_base.den, time_base.num) / time_base.num;
}
for (i = 0; i < s->nb_chapters; i++) {
AVChapter *ch = s->chapters[i];
for (j = 0; j < nut->time_base_count; j++) {
if (!memcmp(&ch->time_base, &nut->time_base[j], sizeof(AVRational)))
break;
}
nut->time_base[j] = ch->time_base;
nut->chapter[i].time_base = &nut->time_base[j];
if(j == nut->time_base_count)
nut->time_base_count++;
}
nut->max_distance = MAX_DISTANCE;
build_elision_headers(s);
build_frame_code(s);
assert(nut->frame_code['N'].flags == FLAG_INVALID);
avio_write(bc, ID_STRING, strlen(ID_STRING));
avio_w8(bc, 0);
if ((ret = write_headers(s, bc)) < 0)
return ret;
avio_flush(bc);
//FIXME index
return 0;
}
static int get_needed_flags(NUTContext *nut, StreamContext *nus, FrameCode *fc, AVPacket *pkt){
int flags= 0;
if(pkt->flags & AV_PKT_FLAG_KEY ) flags |= FLAG_KEY;
if(pkt->stream_index != fc->stream_id ) flags |= FLAG_STREAM_ID;
if(pkt->size / fc->size_mul ) flags |= FLAG_SIZE_MSB;
if(pkt->pts - nus->last_pts != fc->pts_delta) flags |= FLAG_CODED_PTS;
if(pkt->size > 2*nut->max_distance ) flags |= FLAG_CHECKSUM;
if(FFABS(pkt->pts - nus->last_pts)
> nus->max_pts_distance) flags |= FLAG_CHECKSUM;
if( pkt->size < nut->header_len[fc->header_idx]
|| (pkt->size > 4096 && fc->header_idx)
|| memcmp(pkt->data, nut->header[fc->header_idx], nut->header_len[fc->header_idx]))
flags |= FLAG_HEADER_IDX;
return flags | (fc->flags & FLAG_CODED);
}
static int find_best_header_idx(NUTContext *nut, AVPacket *pkt){
int i;
int best_i = 0;
int best_len= 0;
if(pkt->size > 4096)
return 0;
for(i=1; i<nut->header_count; i++){
if( pkt->size >= nut->header_len[i]
&& nut->header_len[i] > best_len
&& !memcmp(pkt->data, nut->header[i], nut->header_len[i])){
best_i= i;
best_len= nut->header_len[i];
}
}
return best_i;
}
static int write_packet(AVFormatContext *s, AVPacket *pkt){
NUTContext *nut = s->priv_data;
StreamContext *nus= &nut->stream[pkt->stream_index];
AVIOContext *bc = s->pb, *dyn_bc;
FrameCode *fc;
int64_t coded_pts;
int best_length, frame_code, flags, needed_flags, i, header_idx, best_header_idx;
int key_frame = !!(pkt->flags & AV_PKT_FLAG_KEY);
int store_sp=0;
int ret;
if(pkt->pts < 0)
return -1;
if(1LL<<(20+3*nut->header_count) <= avio_tell(bc))
write_headers(s, bc);
if(key_frame && !(nus->last_flags & FLAG_KEY))
store_sp= 1;
if(pkt->size + 30/*FIXME check*/ + avio_tell(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 *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];
int64_t dts_tb = av_rescale_rnd(pkt->dts,
nus->time_base->num * (int64_t)nut->stream[i].time_base->den,
nus->time_base->den * (int64_t)nut->stream[i].time_base->num,
AV_ROUND_DOWN);
int index= av_index_search_timestamp(st, dts_tb, 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, (void *) ff_nut_sp_pos_cmp,
NULL);
nut->last_syncpoint_pos= avio_tell(bc);
ret = url_open_dyn_buf(&dyn_bc);
if(ret < 0)
return ret;
put_tt(nut, nus->time_base, dyn_bc, pkt->dts);
ff_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_header_idx= find_best_header_idx(nut, pkt);
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+= ff_get_v_length(pkt->stream_index);
if(pkt->size % fc->size_mul != fc->size_lsb)
continue;
if(flags & FLAG_SIZE_MSB)
length += ff_get_v_length(pkt->size / fc->size_mul);
if(flags & FLAG_CHECKSUM)
length+=4;
if(flags & FLAG_CODED_PTS)
length += ff_get_v_length(coded_pts);
if( (flags & FLAG_CODED)
&& nut->header_len[best_header_idx] > nut->header_len[fc->header_idx]+1){
flags |= FLAG_HEADER_IDX;
}
if(flags & FLAG_HEADER_IDX){
length += 1 - nut->header_len[best_header_idx];
}else{
length -= nut->header_len[fc->header_idx];
}
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);
header_idx= fc->header_idx;
ffio_init_checksum(bc, ff_crc04C11DB7_update, 0);
avio_w8(bc, frame_code);
if(flags & FLAG_CODED){
ff_put_v(bc, (flags^needed_flags) & ~(FLAG_CODED));
flags = needed_flags;
}
if(flags & FLAG_STREAM_ID) ff_put_v(bc, pkt->stream_index);
if(flags & FLAG_CODED_PTS) ff_put_v(bc, coded_pts);
if(flags & FLAG_SIZE_MSB) ff_put_v(bc, pkt->size / fc->size_mul);
if(flags & FLAG_HEADER_IDX) ff_put_v(bc, header_idx= best_header_idx);
if(flags & FLAG_CHECKSUM) avio_wl32(bc, ffio_get_checksum(bc));
else ffio_get_checksum(bc);
avio_write(bc, pkt->data + nut->header_len[header_idx], pkt->size - nut->header_len[header_idx]);
nus->last_flags= flags;
nus->last_pts= pkt->pts;
//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;
AVIOContext *bc= s->pb;
while(nut->header_count<3)
write_headers(s, bc);
avio_flush(bc);
ff_nut_free_sp(nut);
av_freep(&nut->stream);
av_freep(&nut->chapter);
av_freep(&nut->time_base);
return 0;
}
AVOutputFormat ff_nut_muxer = {
"nut",
NULL_IF_CONFIG_SMALL("NUT format"),
"video/x-nut",
"nut",
sizeof(NUTContext),
#if CONFIG_LIBVORBIS
CODEC_ID_VORBIS,
#elif CONFIG_LIBMP3LAME
CODEC_ID_MP3,
#else
CODEC_ID_MP2,
#endif
CODEC_ID_MPEG4,
write_header,
write_packet,
write_trailer,
.flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
.codec_tag = (const AVCodecTag * const []){ ff_codec_bmp_tags, ff_nut_video_tags, ff_codec_wav_tags, ff_nut_subtitle_tags, 0 },
};
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