mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
fourcc & language code v->vb type
some minor cleanups some bugfixes seeking to type 1 and 2 frames (no index needed) timestamp/position cache so seeking without an index is fast Originally committed as revision 2980 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
parent
c9247fc37a
commit
7dddf251a2
@ -79,6 +79,7 @@ typedef struct {
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int lru_size[MAX_SIZE_LRU];
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int initial_pts_predictor[MAX_PTS_LRU];
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int initial_size_predictor[MAX_SIZE_LRU];
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int64_t last_sync_pos; ///<pos of last 1/2 type frame
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} StreamContext;
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typedef struct {
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@ -280,12 +281,25 @@ static int get_str(ByteIOContext *bc, char *string, int maxlen){
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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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return val;
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}
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static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int prefix_length, int calculate_checksum)
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{
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int64_t start, size, last_size;
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start= url_ftell(bc) - prefix_length;
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if(start != nut->packet_start + nut->written_packet_size){
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if(nut->written_packet_size >= 0 && start != nut->packet_start + nut->written_packet_size){
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av_log(nut->avf, AV_LOG_ERROR, "get_packetheader called at weird position\n");
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if(prefix_length<8)
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return -1;
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@ -295,7 +309,7 @@ static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int prefix_lengt
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size= get_v(bc);
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last_size= get_v(bc);
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if(nut->written_packet_size != last_size){
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if(nut->written_packet_size >= 0 && nut->written_packet_size != last_size){
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av_log(nut->avf, AV_LOG_ERROR, "packet size missmatch %d != %lld at %lld\n", nut->written_packet_size, last_size, start);
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if(prefix_length<8)
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return -1;
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@ -319,11 +333,9 @@ static int check_checksum(ByteIOContext *bc){
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static int get_length(uint64_t val){
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int i;
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for (i=7; ; i+=7)
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if ((val>>i) == 0)
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return i;
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for (i=7; val>>i; i+=7);
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return 7; //not reached
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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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@ -345,15 +357,21 @@ static uint64_t find_any_startcode(ByteIOContext *bc, int64_t pos){
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return state;
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}
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}
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av_log(NULL, AV_LOG_DEBUG, "searched until %lld\n", url_ftell(bc));
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return 0;
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}
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static int find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
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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 0;
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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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@ -361,7 +379,7 @@ static int find_startcode(ByteIOContext *bc, uint64_t code, int64_t pos){
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}
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#ifdef CONFIG_ENCODERS
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static int put_v(ByteIOContext *bc, uint64_t val)
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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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@ -373,17 +391,26 @@ static int put_v(ByteIOContext *bc, uint64_t val)
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}
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put_byte(bc, val&0x7f);
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return 0;
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}
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static int put_str(ByteIOContext *bc, const char *string){
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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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return 0;
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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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@ -492,17 +519,17 @@ static int nut_write_header(AVFormatContext *s)
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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_v(bc, 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_v(bc, codec_get_bmp_tag(codec->codec_id));
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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_v(bc, codec_get_wav_tag(codec->codec_id));
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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_v(bc, 0);
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put_vb(bc, 0);
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if (codec->codec_type == CODEC_TYPE_VIDEO)
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{
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@ -524,7 +551,7 @@ static int nut_write_header(AVFormatContext *s)
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nut->stream[i].rate_den= denom;
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put_v(bc, codec->bit_rate);
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put_v(bc, 0); /* no language code */
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put_vb(bc, 0); /* no language code */
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put_v(bc, nom);
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put_v(bc, denom);
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if(nom / denom < 1000)
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@ -875,7 +902,7 @@ static int decode_stream_header(NUTContext *nut){
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if (!st)
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return AVERROR_NOMEM;
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class = get_v(bc);
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tmp = get_v(bc);
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tmp = get_vb(bc);
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switch(class)
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{
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case 0:
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@ -895,7 +922,7 @@ static int decode_stream_header(NUTContext *nut){
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return -1;
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}
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s->bit_rate += get_v(bc);
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get_v(bc); /* language code */
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get_vb(bc); /* language code */
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nom = get_v(bc);
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denom = get_v(bc);
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nut->stream[stream_id].msb_timestamp_shift = get_v(bc);
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@ -1004,11 +1031,11 @@ static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
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/* main header */
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pos=0;
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for(;;){
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if (find_startcode(bc, MAIN_STARTCODE, pos)<0){
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pos= find_startcode(bc, MAIN_STARTCODE, pos)+1;
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if (pos<0){
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av_log(s, AV_LOG_ERROR, "no main startcode found\n");
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return -1;
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}
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pos= url_ftell(bc);
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if(decode_main_header(nut) >= 0)
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break;
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}
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@ -1021,11 +1048,11 @@ static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
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/* stream headers */
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pos=0;
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for(inited_stream_count=0; inited_stream_count < nut->stream_count;){
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if (find_startcode(bc, STREAM_STARTCODE, pos)<0){
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pos= find_startcode(bc, STREAM_STARTCODE, pos)+1;
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if (pos<0){
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av_log(s, AV_LOG_ERROR, "not all stream headers found\n");
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return -1;
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}
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pos= url_ftell(bc);
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if(decode_stream_header(nut) >= 0)
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inited_stream_count++;
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}
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@ -1060,7 +1087,7 @@ static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int fram
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int key_frame = 0;
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int64_t pts = 0;
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const int prefix_len= frame_type == 2 ? 8+1 : 1;
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const int64_t frame_start= url_ftell(bc) + prefix_len;
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const int64_t frame_start= url_ftell(bc) - prefix_len;
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flags= nut->frame_code[frame_code].flags;
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size_mul= nut->frame_code[frame_code].size_mul;
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@ -1097,6 +1124,16 @@ static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int fram
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if(flags & FLAG_PTS){
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if(flags & FLAG_FULL_PTS){
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pts= get_v(bc);
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if(frame_type && key_frame){
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av_add_index_entry(
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s->streams[stream_id],
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frame_start,
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pts,
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frame_start - nut->stream[stream_id].last_sync_pos,
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AVINDEX_KEYFRAME);
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nut->stream[stream_id].last_sync_pos= frame_start;
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assert(nut->packet_start == frame_start);
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}
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}else{
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int64_t mask = (1<<stream->msb_timestamp_shift)-1;
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int64_t delta= stream->last_pts - mask/2;
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@ -1138,11 +1175,11 @@ static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
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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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int size, frame_code=0;
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int frame_type= 0;
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int size, i, frame_code=0;
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int64_t pos;
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for(;;){
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int frame_type= 0;
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uint64_t tmp= nut->next_startcode;
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nut->next_startcode=0;
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@ -1153,15 +1190,11 @@ static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
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frame_code = get_byte(bc);
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if(frame_code == 'N'){
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tmp= frame_code;
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tmp<<=8 ; tmp |= get_byte(bc);
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tmp<<=16; tmp |= get_be16(bc);
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tmp<<=32; tmp |= get_be32(bc);
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for(i=1; i<8; i++)
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tmp = (tmp<<8) + get_byte(bc);
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}
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}
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switch(tmp){
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case KEYFRAME_STARTCODE:
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frame_type = 2;
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break;
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case MAIN_STARTCODE:
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case STREAM_STARTCODE:
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case INDEX_STARTCODE:
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@ -1172,12 +1205,14 @@ static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
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if(decode_info_header(nut)<0)
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goto resync;
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break;
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case KEYFRAME_STARTCODE:
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frame_type = 2;
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frame_code = get_byte(bc);
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case 0:
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if(decode_frame(nut, pkt, frame_code, frame_type)>=0)
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return 0;
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default:
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resync:
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frame_type = 0;
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av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start+1);
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tmp= find_any_startcode(bc, nut->packet_start+1);
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if(tmp==0)
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@ -1209,12 +1244,271 @@ av_log(s, AV_LOG_DEBUG, "steping back to %lld next %d\n", pos, size);
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}
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url_fseek(bc, pos, SEEK_SET);
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nut->written_packet_size= size;
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nut->packet_start= pos - size;
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nut->written_packet_size= -1;
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}
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}
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}
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static int64_t read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit){
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NUTContext *nut = s->priv_data;
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ByteIOContext *bc = &s->pb;
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int64_t pos, pts;
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uint64_t code;
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int frame_code,step, flags, stream_id, i;
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av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%lld,%lld)\n", stream_index, *pos_arg, pos_limit);
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if(*pos_arg < 0)
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return AV_NOPTS_VALUE;
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// find a previous startcode, FIXME use forward search and follow backward pointers if undamaged stream
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pos= *pos_arg;
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step= FFMIN(16*1024, pos);
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do{
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pos-= step;
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code= find_any_startcode(bc, pos);
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if(code && url_ftell(bc) - 8 < *pos_arg)
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break;
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step= FFMIN(2*step, pos);
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}while(step);
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if(!code) //nothing found, not even after pos_arg
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return AV_NOPTS_VALUE;
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url_fseek(bc, -8, SEEK_CUR);
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for(i=0; i<s->nb_streams; i++)
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nut->stream[i].last_sync_pos= url_ftell(bc);
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for(;;){
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int64_t pos= url_ftell(bc);
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uint64_t tmp=0;
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int prefix_len=1;
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if(pos > pos_limit)
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return AV_NOPTS_VALUE;
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frame_code = get_byte(bc);
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if(frame_code == 'N'){
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tmp= frame_code;
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for(i=1; i<8; i++)
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tmp = (tmp<<8) + get_byte(bc);
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}
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//av_log(s, AV_LOG_DEBUG, "before switch %llX at=%lld\n", tmp, pos);
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switch(tmp){
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case MAIN_STARTCODE:
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case STREAM_STARTCODE:
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case INDEX_STARTCODE:
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case INFO_STARTCODE:
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nut->written_packet_size= -1;
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get_packetheader(nut, bc, 8, 0);
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url_fseek(bc, nut->written_packet_size + nut->packet_start, SEEK_SET);
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break;
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case KEYFRAME_STARTCODE:
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nut->written_packet_size= -1;
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prefix_len+=8;
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frame_code = get_byte(bc);
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case 0:
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flags= nut->frame_code[frame_code].flags;
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stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;
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if(get_packetheader(nut, bc, prefix_len, 0) < 0)
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goto resync;
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if(!(flags & FLAG_FRAME_TYPE) || !(flags & FLAG_PTS) || !(flags & FLAG_FULL_PTS))
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goto resync;
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if(stream_id==-1)
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stream_id= get_v(bc);
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if(stream_id >= s->nb_streams)
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goto resync;
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pts= get_v(bc);
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if(flags & FLAG_KEY_FRAME){
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av_add_index_entry(
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s->streams[stream_id],
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pos,
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pts,
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pos - nut->stream[stream_id].last_sync_pos,
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AVINDEX_KEYFRAME);
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nut->stream[stream_id].last_sync_pos= pos;
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}
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if(stream_id != stream_index || !(flags & FLAG_KEY_FRAME) || nut->packet_start < *pos_arg){
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url_fseek(bc, nut->written_packet_size + nut->packet_start, SEEK_SET);
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break;
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}
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*pos_arg= nut->packet_start;
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assert(nut->packet_start == pos);
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return pts;
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default:
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resync:
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av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start+1);
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if(!find_any_startcode(bc, nut->packet_start+1))
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return AV_NOPTS_VALUE;
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url_fseek(bc, -8, SEEK_CUR);
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}
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}
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return AV_NOPTS_VALUE;
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}
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#define DEBUG_SEEK
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static int nut_read_seek(AVFormatContext *s, int stream_index, int64_t target_ts){
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NUTContext *nut = s->priv_data;
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StreamContext *stream;
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int64_t pos_min, pos_max, pos, pos_limit;
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int64_t ts_min, ts_max, ts;
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int index, no_change,i;
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AVStream *st;
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if (stream_index < 0) {
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stream_index = av_find_default_stream_index(s);
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if (stream_index < 0)
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return -1;
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}
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stream= &nut->stream[stream_index];
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target_ts= (av_rescale(target_ts, stream->rate_num, stream->rate_den) + AV_TIME_BASE/2) / AV_TIME_BASE;
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#ifdef DEBUG_SEEK
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av_log(s, AV_LOG_DEBUG, "read_seek: %d %lld\n", stream_index, target_ts);
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#endif
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ts_max=
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ts_min= AV_NOPTS_VALUE;
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pos_limit= -1; //gcc falsely says it may be uninitalized
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st= s->streams[stream_index];
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if(st->index_entries){
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AVIndexEntry *e;
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index= av_index_search_timestamp(st, target_ts);
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e= &st->index_entries[index];
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if(e->timestamp <= target_ts || e->pos == e->min_distance){
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pos_min= e->pos;
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ts_min= e->timestamp;
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#ifdef DEBUG_SEEK
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av_log(s, AV_LOG_DEBUG, "unsing cached pos_min=0x%llx dts_min=%lld\n",
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pos_min,ts_min);
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#endif
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}else{
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assert(index==0);
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}
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index++;
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if(index < st->nb_index_entries){
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e= &st->index_entries[index];
|
||||
assert(e->timestamp >= target_ts);
|
||||
pos_max= e->pos;
|
||||
ts_max= e->timestamp;
|
||||
pos_limit= pos_max - e->min_distance;
|
||||
#ifdef DEBUG_SEEK
|
||||
av_log(s, AV_LOG_DEBUG, "unsing cached pos_max=0x%llx pos_limit=0x%llx dts_max=%lld\n",
|
||||
pos_max,pos_limit, ts_max);
|
||||
#endif
|
||||
}
|
||||
}
|
||||
|
||||
if(ts_min == AV_NOPTS_VALUE){
|
||||
pos_min = 0;
|
||||
ts_min = read_timestamp(s, stream_index, &pos_min, INT64_MAX);
|
||||
if (ts_min == AV_NOPTS_VALUE)
|
||||
return -1;
|
||||
}
|
||||
|
||||
if(ts_max == AV_NOPTS_VALUE){
|
||||
int step= 1024;
|
||||
pos_max = url_filesize(url_fileno(&s->pb)) - 1;
|
||||
do{
|
||||
pos_max -= step;
|
||||
ts_max = read_timestamp(s, stream_index, &pos_max, pos_max + step);
|
||||
step += step;
|
||||
}while(ts_max == AV_NOPTS_VALUE && pos_max >= step);
|
||||
if (ts_max == AV_NOPTS_VALUE)
|
||||
return -1;
|
||||
|
||||
for(;;){
|
||||
int64_t tmp_pos= pos_max + 1;
|
||||
int64_t tmp_ts= read_timestamp(s, stream_index, &tmp_pos, INT64_MAX);
|
||||
if(tmp_ts == AV_NOPTS_VALUE)
|
||||
break;
|
||||
ts_max= tmp_ts;
|
||||
pos_max= tmp_pos;
|
||||
}
|
||||
pos_limit= pos_max;
|
||||
}
|
||||
|
||||
no_change=0;
|
||||
while (pos_min < pos_limit) {
|
||||
#ifdef DEBUG_SEEK
|
||||
av_log(s, AV_LOG_DEBUG, "pos_min=0x%llx pos_max=0x%llx dts_min=%lld dts_max=%lld\n",
|
||||
pos_min, pos_max,
|
||||
ts_min, ts_max);
|
||||
#endif
|
||||
int64_t start_pos;
|
||||
assert(pos_limit <= pos_max);
|
||||
|
||||
if(no_change==0){
|
||||
int64_t approximate_keyframe_distance= pos_max - pos_limit;
|
||||
// interpolate position (better than dichotomy)
|
||||
pos = (int64_t)((double)(pos_max - pos_min) *
|
||||
(double)(target_ts - ts_min) /
|
||||
(double)(ts_max - ts_min)) + pos_min - approximate_keyframe_distance;
|
||||
}else if(no_change==1){
|
||||
// bisection, if interpolation failed to change min or max pos last time
|
||||
pos = (pos_min + pos_limit)>>1;
|
||||
}else{
|
||||
// linear search if bisection failed, can only happen if there are very few or no keframes between min/max
|
||||
pos=pos_min;
|
||||
}
|
||||
if(pos <= pos_min)
|
||||
pos= pos_min + 1;
|
||||
else if(pos > pos_limit)
|
||||
pos= pos_limit;
|
||||
start_pos= pos;
|
||||
|
||||
ts = read_timestamp(s, stream_index, &pos, INT64_MAX); //may pass pos_limit instead of -1
|
||||
if(pos == pos_max)
|
||||
no_change++;
|
||||
else
|
||||
no_change=0;
|
||||
#ifdef DEBUG_SEEK
|
||||
av_log(s, AV_LOG_DEBUG, "%Ld %Ld %Ld / %Ld %Ld %Ld target:%Ld limit:%Ld start:%Ld noc:%d\n", pos_min, pos, pos_max, ts_min, ts, ts_max, target_ts, pos_limit, start_pos, no_change);
|
||||
#endif
|
||||
assert(ts != AV_NOPTS_VALUE);
|
||||
if (target_ts < ts) {
|
||||
pos_limit = start_pos - 1;
|
||||
pos_max = pos;
|
||||
ts_max = ts;
|
||||
} else {
|
||||
pos_min = pos;
|
||||
ts_min = ts;
|
||||
/* check if we are lucky */
|
||||
if (target_ts == ts)
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
pos = pos_min;
|
||||
#ifdef DEBUG_SEEK
|
||||
pos_min = pos;
|
||||
ts_min = read_timestamp(s, stream_index, &pos_min, INT64_MAX);
|
||||
pos_min++;
|
||||
ts_max = read_timestamp(s, stream_index, &pos_min, INT64_MAX);
|
||||
av_log(s, AV_LOG_DEBUG, "pos=0x%llx %lld<=%lld<=%lld\n",
|
||||
pos, ts_min, target_ts, ts_max);
|
||||
#endif
|
||||
/* do the seek */
|
||||
url_fseek(&s->pb, pos, SEEK_SET);
|
||||
|
||||
nut->written_packet_size= -1;
|
||||
for(i=0; i<s->nb_streams; i++)
|
||||
nut->stream[i].last_sync_pos= pos;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nut_read_close(AVFormatContext *s)
|
||||
{
|
||||
NUTContext *nut = s->priv_data;
|
||||
@ -1236,7 +1530,7 @@ static AVInputFormat nut_iformat = {
|
||||
nut_read_header,
|
||||
nut_read_packet,
|
||||
nut_read_close,
|
||||
// nut_read_seek,
|
||||
nut_read_seek,
|
||||
.extensions = "nut",
|
||||
};
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user