mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-24 03:59:43 +00:00
match latest spec
seeking to startcode-less frames Originally committed as revision 3102 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
parent
ae4cffd9fc
commit
0b43db1448
@ -47,23 +47,20 @@
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#define INDEX_STARTCODE (0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48))
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#define INFO_STARTCODE (0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48))
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#define MAX_TYPE1_DISTANCE (1024*16-1)
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#define MAX_TYPE2_DISTANCE (1024*64-1)
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#define MAX_DISTANCE (1024*16-1)
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#define MAX_SHORT_DISTANCE (1024*4-1)
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#define MAX_SIZE_LRU 2
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#define MAX_PTS_LRU 3
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#define FLAG_FRAME_TYPE 1
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#define FLAG_DATA_SIZE 2
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#define FLAG_PTS 16
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#define FLAG_FULL_PTS 4
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#define FLAG_KEY_FRAME 32
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#define FLAG_DATA_SIZE 4
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#define FLAG_PTS 3
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#define FLAG_KEY_FRAME 8
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typedef struct {
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uint8_t flags;
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uint8_t stream_id_plus1;
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uint8_t size_mul;
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uint8_t size_lsb;
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uint16_t size_mul;
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uint16_t size_lsb;
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} FrameCode;
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typedef struct {
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@ -72,25 +69,21 @@ typedef struct {
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int rate_num;
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int rate_den;
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int64_t last_pts;
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int64_t last_full_pts;
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int lru_pts_delta[MAX_PTS_LRU];
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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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int decode_delay;
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} StreamContext;
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typedef struct {
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AVFormatContext *avf;
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int64_t packet_start;
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int64_t last_packet_start;
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int written_packet_size;
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int64_t packet_size_pos;
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int64_t last_frame_start[3];
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int64_t packet_start[3]; //0-> startcode less, 1-> short startcode 2-> long startcodes
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FrameCode frame_code[256];
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int stream_count;
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uint64_t next_startcode; ///< stores the next startcode if it has alraedy been parsed but the stream isnt seekable
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StreamContext *stream;
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int max_distance;
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} NUTContext;
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static char *info_table[][2]={
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@ -130,16 +123,14 @@ static void update_lru(int *lru, int current, int count){
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static void update(NUTContext *nut, int stream_index, int64_t frame_start, int frame_type, int frame_code, int key_frame, int size, int64_t pts){
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StreamContext *stream= &nut->stream[stream_index];
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const int flags=nut->frame_code[frame_code].flags;
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stream->last_key_frame= key_frame;
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nut->last_frame_start[ frame_type ]= frame_start;
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if(frame_type == 0)
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nut->packet_start[ frame_type ]= frame_start;
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if(stream->last_pts != AV_NOPTS_VALUE){
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assert(frame_type < 2);
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update_lru(stream->lru_pts_delta, pts - stream->last_pts, 3);
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update_lru(stream->lru_size, size, 2);
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}
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stream->last_pts= pts;
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if((flags & FLAG_PTS) && (flags & FLAG_FULL_PTS))
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stream->last_full_pts= pts;
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}
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static void reset(AVFormatContext *s/*, int frame_type*/){
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@ -150,30 +141,25 @@ static void reset(AVFormatContext *s/*, int frame_type*/){
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StreamContext *stream= &nut->stream[i];
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stream->last_key_frame= 1;
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stream->last_pts= AV_NOPTS_VALUE;
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memcpy(stream->lru_pts_delta, stream->initial_pts_predictor, sizeof(int)*MAX_PTS_LRU);
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memcpy(stream->lru_size, stream->initial_size_predictor, sizeof(int)*MAX_SIZE_LRU);
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}
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}
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static void build_frame_code(AVFormatContext *s){
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NUTContext *nut = s->priv_data;
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int key_frame, frame_type, full_pts, index, pred, stream_id;
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int key_frame, index, pred, stream_id, full_pts;
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int start=0;
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int end= 255;
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int keyframe_0_esc= s->nb_streams > 2;
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if(keyframe_0_esc){
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/* keyframe = 0 escapes, 3 codes */
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for(frame_type=0; frame_type<2; frame_type++){
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for(full_pts=frame_type; full_pts<2; full_pts++){
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FrameCode *ft= &nut->frame_code[start];
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ft->flags= FLAG_FRAME_TYPE*frame_type + FLAG_FULL_PTS*full_pts;
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ft->flags|= FLAG_DATA_SIZE | FLAG_PTS;
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ft->stream_id_plus1= 0;
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ft->size_mul=1;
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start++;
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}
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}
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/* keyframe = 0 escape */
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FrameCode *ft= &nut->frame_code[start];
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ft->flags= FLAG_DATA_SIZE | FLAG_PTS;
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ft->stream_id_plus1= 0;
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ft->size_mul=1;
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start++;
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}
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for(stream_id= 0; stream_id<s->nb_streams; stream_id++){
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@ -188,15 +174,13 @@ static void build_frame_code(AVFormatContext *s){
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if(intra_only && keyframe_0_esc && key_frame==0)
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continue;
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for(frame_type=0; frame_type<2; frame_type++){
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for(full_pts=frame_type; full_pts<2; full_pts++){
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FrameCode *ft= &nut->frame_code[start2];
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ft->flags= FLAG_FRAME_TYPE*frame_type + FLAG_FULL_PTS*full_pts + FLAG_KEY_FRAME*key_frame;
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ft->flags|= FLAG_DATA_SIZE | FLAG_PTS;
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ft->stream_id_plus1= stream_id + 1;
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ft->size_mul=1;
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start2++;
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}
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{
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FrameCode *ft= &nut->frame_code[start2];
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ft->flags= FLAG_KEY_FRAME*key_frame;
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ft->flags|= FLAG_DATA_SIZE | FLAG_PTS;
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ft->stream_id_plus1= stream_id + 1;
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ft->size_mul=1;
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start2++;
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}
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}
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@ -204,16 +188,16 @@ static void build_frame_code(AVFormatContext *s){
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#if 1
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if(is_audio){
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int frame_bytes= codec->frame_size*(int64_t)codec->bit_rate / (8*codec->sample_rate);
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for(pred=0; pred<MAX_SIZE_LRU; pred++){
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for(frame_type=0; frame_type<1; frame_type++){
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for(full_pts=0; full_pts<2; full_pts++){
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for(pred=0; pred<2; pred++){
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FrameCode *ft= &nut->frame_code[start2];
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ft->flags= FLAG_KEY_FRAME*key_frame + (FLAG_FULL_PTS+FLAG_PTS+FLAG_FRAME_TYPE)*frame_type;
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ft->flags= FLAG_KEY_FRAME*key_frame + FLAG_PTS*full_pts;
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ft->stream_id_plus1= stream_id + 1;
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ft->size_mul=1;
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ft->size_lsb=1 + pred;
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ft->size_mul=frame_bytes + 2;
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ft->size_lsb=frame_bytes + pred;
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start2++;
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av_log(NULL, AV_LOG_DEBUG, "%d\n", frame_bytes + pred);
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}
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nut->stream[stream_id].initial_size_predictor[pred]= frame_bytes + pred;
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}
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}else{
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FrameCode *ft= &nut->frame_code[start2];
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@ -254,8 +238,10 @@ static uint64_t get_v(ByteIOContext *bc)
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if (tmp&0x80)
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val= (val<<7) + tmp - 0x80;
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else
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else{
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//av_log(NULL, AV_LOG_DEBUG, "get_v()= %lld\n", (val<<7) + tmp);
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return (val<<7) + tmp;
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}
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}
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return -1;
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}
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@ -289,32 +275,20 @@ static uint64_t get_vb(ByteIOContext *bc){
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while(i--)
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val = (val<<8) + get_byte(bc);
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//av_log(NULL, AV_LOG_DEBUG, "get_vb()= %lld\n", val);
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return val;
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}
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static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int prefix_length, int calculate_checksum)
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static int get_packetheader(NUTContext *nut, ByteIOContext *bc, int calculate_checksum)
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{
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int64_t start, size, last_size;
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start= url_ftell(bc) - prefix_length;
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int64_t start, size;
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start= url_ftell(bc) - 8;
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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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}
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init_checksum(bc, calculate_checksum ? update_adler32 : NULL, 0);
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size= get_v(bc);
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last_size= get_v(bc);
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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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}
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nut->last_packet_start = nut->packet_start;
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nut->packet_start = start;
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nut->packet_start[2] = start;
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nut->written_packet_size= size;
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return size;
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@ -381,6 +355,7 @@ static void put_v(ByteIOContext *bc, uint64_t val)
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{
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int i;
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//av_log(NULL, AV_LOG_DEBUG, "put_v()= %lld\n", val);
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val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
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i= get_length(val);
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@ -414,9 +389,8 @@ static void put_vb(ByteIOContext *bc, uint64_t val){
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static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, int calculate_checksum)
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{
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put_flush_packet(bc);
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nut->last_packet_start= nut->packet_start;
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nut->packet_start+= nut->written_packet_size;
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nut->packet_size_pos = url_ftell(bc);
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nut->packet_start[2]+= nut->written_packet_size;
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assert(url_ftell(bc) - 8 == nut->packet_start[2]);
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nut->written_packet_size = max_size;
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if(calculate_checksum)
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@ -424,13 +398,12 @@ static int put_packetheader(NUTContext *nut, ByteIOContext *bc, int max_size, in
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/* packet header */
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put_v(bc, nut->written_packet_size); /* forward ptr */
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put_v(bc, nut->packet_start - nut->last_packet_start); /* backward ptr */
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return 0;
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}
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static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additional_size, int calculate_checksum){
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int64_t start= nut->packet_start;
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int64_t start= nut->packet_start[2];
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int64_t cur= url_ftell(bc);
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int size= cur - start + additional_size;
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@ -442,7 +415,7 @@ static int update_packetheader(NUTContext *nut, ByteIOContext *bc, int additiona
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assert( size <= nut->written_packet_size );
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url_fseek(bc, nut->packet_size_pos, SEEK_SET);
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url_fseek(bc, start + 8, SEEK_SET);
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for(i=get_length(size); i < get_length(nut->written_packet_size); i+=7)
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put_byte(bc, 0x80);
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put_v(bc, size);
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@ -474,8 +447,9 @@ static int nut_write_header(AVFormatContext *s)
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/* main header */
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put_be64(bc, MAIN_STARTCODE);
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put_packetheader(nut, bc, 120+5*256, 1);
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put_v(bc, 1); /* version */
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put_v(bc, 2); /* version */
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put_v(bc, s->nb_streams);
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put_v(bc, MAX_DISTANCE);
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build_frame_code(s);
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assert(nut->frame_code['N'].flags == 1);
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@ -558,8 +532,7 @@ static int nut_write_header(AVFormatContext *s)
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put_v(bc, nut->stream[i].msb_timestamp_shift);
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for(j=0; j<3; j++)
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put_v(bc, nut->stream[i].initial_pts_predictor[j]);
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for(j=0; j<2; j++)
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put_v(bc, nut->stream[i].initial_size_predictor[j]);
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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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if(codec->extradata_size){
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@ -572,7 +545,8 @@ static int nut_write_header(AVFormatContext *s)
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switch(codec->codec_type)
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{
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case CODEC_TYPE_AUDIO:
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put_v(bc, (codec->sample_rate * denom) / nom);
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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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@ -626,6 +600,12 @@ static int nut_write_header(AVFormatContext *s)
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return 0;
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}
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static int64_t lsb2full(StreamContext *stream, int64_t lsb){
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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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return ((lsb - delta)&mask) + delta;
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}
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static int nut_write_packet(AVFormatContext *s, int stream_index,
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const uint8_t *buf, int size, int64_t pts)
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{
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@ -634,7 +614,7 @@ static int nut_write_packet(AVFormatContext *s, int stream_index,
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ByteIOContext *bc = &s->pb;
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int key_frame = 0, full_pts=0;
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AVCodecContext *enc;
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int64_t lsb_pts, delta_pts;
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int64_t coded_pts;
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int frame_type, best_length, frame_code, flags, i, size_mul, size_lsb;
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const int64_t frame_start= url_ftell(bc);
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@ -647,26 +627,25 @@ static int nut_write_packet(AVFormatContext *s, int stream_index,
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key_frame = enc->coded_frame->key_frame;
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if(enc->coded_frame->pts != AV_NOPTS_VALUE)
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pts= (av_rescale(enc->coded_frame->pts, stream->rate_num, stream->rate_den) + AV_TIME_BASE/2) / AV_TIME_BASE; //FIXME XXX HACK
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delta_pts= pts - stream->last_pts;
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frame_type=0;
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if(frame_start + size + 20 - FFMAX(nut->last_frame_start[1], nut->last_frame_start[2]) > MAX_TYPE1_DISTANCE)
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frame_type=1;
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if(key_frame){
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if(frame_type==1 && frame_start + size - nut->last_frame_start[2] > MAX_TYPE2_DISTANCE)
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frame_type=2;
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if(!stream->last_key_frame)
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frame_type=2;
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}
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if(frame_start + size + 20 - FFMAX(nut->packet_start[1], nut->packet_start[2]) > MAX_DISTANCE)
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frame_type=2;
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if(key_frame && !stream->last_key_frame)
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frame_type=2;
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if(frame_type>0){
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update_packetheader(nut, bc, 0, 0);
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if(frame_type>1)
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reset(s);
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if(stream->last_pts == AV_NOPTS_VALUE)
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full_pts=1;
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else{
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coded_pts = pts & ((1<<stream->msb_timestamp_shift)-1);
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if(lsb2full(stream, coded_pts) != pts)
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full_pts=1;
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}
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//FIXME ensure that the timestamp can be represented by either delta or lsb or full_pts=1
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lsb_pts = pts & ((1 << stream->msb_timestamp_shift)-1);
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if(full_pts)
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coded_pts= pts + (1<<stream->msb_timestamp_shift);
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best_length=INT_MAX;
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frame_code= -1;
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@ -678,6 +657,8 @@ static int nut_write_packet(AVFormatContext *s, int stream_index,
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size_lsb= nut->frame_code[i].size_lsb;
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flags= nut->frame_code[i].flags;
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assert(size_mul > size_lsb);
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if(stream_id_plus1 == 0) length+= get_length(stream_index);
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else if(stream_id_plus1 - 1 != stream_index)
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continue;
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@ -687,36 +668,23 @@ static int nut_write_packet(AVFormatContext *s, int stream_index,
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if(fc_key_frame != key_frame)
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continue;
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if((!!(flags & FLAG_FRAME_TYPE)) != (frame_type > 0))
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continue;
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if(size_mul <= size_lsb){
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int p= stream->lru_size[size_lsb - size_mul];
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if(p != size)
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continue;
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}else{
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if(flags & FLAG_DATA_SIZE){
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if(size % size_mul != size_lsb)
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continue;
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if(flags & FLAG_DATA_SIZE)
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length += get_length(size / size_mul);
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else if(size/size_mul)
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continue;
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}
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length += get_length(size / size_mul);
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}else if(size != size_lsb)
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continue;
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if(full_pts != ((flags & FLAG_PTS) && (flags & FLAG_FULL_PTS)))
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if(full_pts && (flags & FLAG_PTS) != FLAG_PTS)
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continue;
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if(flags&FLAG_PTS){
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if(flags&FLAG_FULL_PTS){
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length += get_length(pts);
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}else{
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length += get_length(lsb_pts);
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}
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length += get_length(coded_pts);
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}else{
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int delta= stream->lru_pts_delta[(flags & 12)>>2];
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int delta= stream->lru_pts_delta[flags & FLAG_PTS];
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if(delta != pts - stream->last_pts)
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continue;
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assert(frame_type == 0);
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assert(frame_type < 2);
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}
|
||||
|
||||
if(length < best_length){
|
||||
@ -733,33 +701,27 @@ static int nut_write_packet(AVFormatContext *s, int stream_index,
|
||||
#if 0
|
||||
best_length /= 7;
|
||||
best_length ++; //frame_code
|
||||
if(frame_type>0){
|
||||
best_length += 4; //packet header
|
||||
if(frame_type>1)
|
||||
best_length += 8; // startcode
|
||||
if(frame_type==2){
|
||||
best_length += 8; // startcode
|
||||
}
|
||||
av_log(s, AV_LOG_DEBUG, "kf:%d ft:%d pt:%d fc:%2X len:%2d size:%d stream:%d flag:%d mul:%d lsb:%d s+1:%d pts_delta:%d\n", key_frame, frame_type, full_pts ? 2 : ((flags & FLAG_PTS) ? 1 : 0), frame_code, best_length, size, stream_index, flags, size_mul, size_lsb, nut->frame_code[frame_code].stream_id_plus1,(int)(pts - stream->last_pts));
|
||||
av_log(s, AV_LOG_DEBUG, "kf:%d ft:%d pt:%d fc:%2X len:%2d size:%d stream:%d flag:%d mul:%d lsb:%d s+1:%d pts_delta:%d pts:%lld\n", key_frame, frame_type, full_pts ? 2 : ((flags & FLAG_PTS) == FLAG_PTS ? 1 : 0), frame_code, best_length, size, stream_index, flags, size_mul, size_lsb, nut->frame_code[frame_code].stream_id_plus1,(int)(pts - stream->last_pts), pts);
|
||||
// av_log(s, AV_LOG_DEBUG, "%d %d %d\n", stream->lru_pts_delta[0], stream->lru_pts_delta[1], stream->lru_pts_delta[2]);
|
||||
#endif
|
||||
|
||||
if (frame_type==2)
|
||||
put_be64(bc, KEYFRAME_STARTCODE);
|
||||
assert(frame_type != 1); //short startcode not implemented yet
|
||||
put_byte(bc, frame_code);
|
||||
|
||||
if(frame_type>0)
|
||||
put_packetheader(nut, bc, FFMAX(size+20, MAX_TYPE1_DISTANCE), 0);
|
||||
if(nut->frame_code[frame_code].stream_id_plus1 == 0)
|
||||
put_v(bc, stream_index);
|
||||
if (flags & FLAG_PTS){
|
||||
if (flags & FLAG_FULL_PTS)
|
||||
put_v(bc, pts);
|
||||
else
|
||||
put_v(bc, lsb_pts);
|
||||
if ((flags & FLAG_PTS) == FLAG_PTS){
|
||||
put_v(bc, coded_pts);
|
||||
}
|
||||
if(flags & FLAG_DATA_SIZE)
|
||||
put_v(bc, size / size_mul);
|
||||
if(size > MAX_TYPE1_DISTANCE){
|
||||
assert(frame_type > 0);
|
||||
update_packetheader(nut, bc, size, 0);
|
||||
if(size > MAX_DISTANCE){
|
||||
assert(frame_type > 1);
|
||||
}
|
||||
|
||||
put_buffer(bc, buf, size);
|
||||
@ -774,8 +736,6 @@ static int nut_write_trailer(AVFormatContext *s)
|
||||
NUTContext *nut = s->priv_data;
|
||||
ByteIOContext *bc = &s->pb;
|
||||
|
||||
update_packetheader(nut, bc, 0, 0);
|
||||
|
||||
#if 0
|
||||
int i;
|
||||
|
||||
@ -802,12 +762,10 @@ static int nut_write_trailer(AVFormatContext *s)
|
||||
static int nut_probe(AVProbeData *p)
|
||||
{
|
||||
int i;
|
||||
uint64_t code;
|
||||
uint64_t code= 0xff;
|
||||
|
||||
code = 0xff;
|
||||
for (i = 0; i < p->buf_size; i++) {
|
||||
int c = p->buf[i];
|
||||
code = (code << 8) | c;
|
||||
code = (code << 8) | p->buf[i];
|
||||
if (code == MAIN_STARTCODE)
|
||||
return AVPROBE_SCORE_MAX;
|
||||
}
|
||||
@ -820,16 +778,17 @@ static int decode_main_header(NUTContext *nut){
|
||||
uint64_t tmp;
|
||||
int i, j;
|
||||
|
||||
get_packetheader(nut, bc, 8, 1);
|
||||
get_packetheader(nut, bc, 1);
|
||||
|
||||
tmp = get_v(bc);
|
||||
if (tmp != 1){
|
||||
if (tmp != 2){
|
||||
av_log(s, AV_LOG_ERROR, "bad version (%Ld)\n", tmp);
|
||||
return -1;
|
||||
}
|
||||
|
||||
nut->stream_count = get_v(bc);
|
||||
|
||||
nut->max_distance = get_v(bc);
|
||||
|
||||
for(i=0; i<256;){
|
||||
int tmp_flags = get_v(bc);
|
||||
int tmp_stream= get_v(bc);
|
||||
@ -842,13 +801,6 @@ static int decode_main_header(NUTContext *nut){
|
||||
return -1;
|
||||
}
|
||||
|
||||
if((tmp_flags & FLAG_FRAME_TYPE) && tmp_flags != 1){
|
||||
if(!(tmp_flags & FLAG_PTS) || !(tmp_flags & FLAG_FULL_PTS) ){
|
||||
av_log(s, AV_LOG_ERROR, "no full pts in non 0 frame type\n");
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
for(j=0; j<count; j++,i++){
|
||||
if(tmp_stream > nut->stream_count + 1){
|
||||
av_log(s, AV_LOG_ERROR, "illegal stream number\n");
|
||||
@ -885,7 +837,7 @@ static int decode_stream_header(NUTContext *nut){
|
||||
uint64_t tmp;
|
||||
AVStream *st;
|
||||
|
||||
get_packetheader(nut, bc, 8, 1);
|
||||
get_packetheader(nut, bc, 1);
|
||||
stream_id= get_v(bc);
|
||||
if(stream_id >= nut->stream_count || s->streams[stream_id])
|
||||
return -1;
|
||||
@ -920,9 +872,8 @@ static int decode_stream_header(NUTContext *nut){
|
||||
denom = get_v(bc);
|
||||
nut->stream[stream_id].msb_timestamp_shift = get_v(bc);
|
||||
for(i=0; i<3; i++)
|
||||
nut->stream[stream_id].initial_pts_predictor[i]= get_v(bc);
|
||||
for(i=0; i<2; i++)
|
||||
nut->stream[stream_id].initial_size_predictor[i]= get_v(bc);
|
||||
nut->stream[stream_id].initial_pts_predictor[i]= get_v(bc);
|
||||
nut->stream[stream_id].decode_delay= get_v(bc);
|
||||
get_byte(bc); /* flags */
|
||||
|
||||
/* codec specific data headers */
|
||||
@ -946,7 +897,8 @@ static int decode_stream_header(NUTContext *nut){
|
||||
}
|
||||
if (class == 32) /* AUDIO */
|
||||
{
|
||||
st->codec.sample_rate = (get_v(bc) * nom) / denom;
|
||||
st->codec.sample_rate = get_v(bc);
|
||||
get_v(bc); // samplerate_den
|
||||
st->codec.channels = get_v(bc);
|
||||
}
|
||||
if(check_checksum(bc)){
|
||||
@ -962,7 +914,7 @@ static int decode_info_header(NUTContext *nut){
|
||||
AVFormatContext *s= nut->avf;
|
||||
ByteIOContext *bc = &s->pb;
|
||||
|
||||
get_packetheader(nut, bc, 8, 1);
|
||||
get_packetheader(nut, bc, 1);
|
||||
|
||||
for(;;){
|
||||
int id= get_v(bc);
|
||||
@ -1072,28 +1024,30 @@ static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int frame_type){
|
||||
static int decode_frame_header(NUTContext *nut, int *key_frame_ret, int64_t *pts_ret, int *stream_id_ret, int frame_code, int frame_type){
|
||||
AVFormatContext *s= nut->avf;
|
||||
StreamContext *stream;
|
||||
ByteIOContext *bc = &s->pb;
|
||||
int size, flags, size_mul, size_lsb, stream_id;
|
||||
int key_frame = 0;
|
||||
int64_t pts = 0;
|
||||
const int prefix_len= frame_type == 2 ? 8+1 : 1;
|
||||
const int64_t frame_start= url_ftell(bc) - prefix_len;
|
||||
|
||||
if(frame_type < 2 && frame_start - nut->packet_start[2] > nut->max_distance){
|
||||
av_log(s, AV_LOG_ERROR, "last frame must have been damaged\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
if(frame_type)
|
||||
nut->packet_start[ frame_type ]= frame_start; //otherwise 1 goto 1 may happen
|
||||
|
||||
flags= nut->frame_code[frame_code].flags;
|
||||
size_mul= nut->frame_code[frame_code].size_mul;
|
||||
size_lsb= nut->frame_code[frame_code].size_lsb;
|
||||
stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;
|
||||
|
||||
if(flags & FLAG_FRAME_TYPE){
|
||||
if(frame_type == 2)
|
||||
reset(s);
|
||||
if(get_packetheader(nut, bc, prefix_len, 0) < 0)
|
||||
return -1;
|
||||
if(frame_type!=2)
|
||||
frame_type= 1;
|
||||
}
|
||||
|
||||
if(stream_id==-1)
|
||||
stream_id= get_v(bc);
|
||||
@ -1104,57 +1058,79 @@ static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int fram
|
||||
stream= &nut->stream[stream_id];
|
||||
|
||||
// av_log(s, AV_LOG_DEBUG, "ft:%d ppts:%d %d %d\n", frame_type, stream->lru_pts_delta[0], stream->lru_pts_delta[1], stream->lru_pts_delta[2]);
|
||||
|
||||
key_frame= !!(flags & FLAG_KEY_FRAME);
|
||||
|
||||
if(flags & FLAG_PTS){
|
||||
if(flags & FLAG_FULL_PTS){
|
||||
pts= get_v(bc);
|
||||
if(frame_type && key_frame){
|
||||
int64_t av_pts= pts * AV_TIME_BASE * stream->rate_den / stream->rate_num;
|
||||
av_add_index_entry(
|
||||
s->streams[stream_id],
|
||||
frame_start,
|
||||
av_pts,
|
||||
frame_start - nut->stream[stream_id].last_sync_pos,
|
||||
AVINDEX_KEYFRAME);
|
||||
nut->stream[stream_id].last_sync_pos= frame_start;
|
||||
assert(nut->packet_start == frame_start);
|
||||
}
|
||||
*key_frame_ret= !!(flags & FLAG_KEY_FRAME);
|
||||
|
||||
if((flags & FLAG_PTS) == FLAG_PTS){
|
||||
int64_t mask = (1<<stream->msb_timestamp_shift)-1;
|
||||
pts= get_v(bc);
|
||||
if(pts > mask){
|
||||
pts -= mask+1;
|
||||
}else{
|
||||
int64_t mask = (1<<stream->msb_timestamp_shift)-1;
|
||||
int64_t delta= stream->last_pts - mask/2;
|
||||
pts= ((get_v(bc) - delta)&mask) + delta;
|
||||
if(stream->last_pts == AV_NOPTS_VALUE){
|
||||
av_log(s, AV_LOG_ERROR, "no reference pts available\n");
|
||||
return -1;
|
||||
}
|
||||
pts= lsb2full(stream, pts);
|
||||
}
|
||||
}else{
|
||||
pts= stream->last_pts + stream->lru_pts_delta[(flags&12)>>2];
|
||||
if(stream->last_pts == AV_NOPTS_VALUE){
|
||||
av_log(s, AV_LOG_ERROR, "no reference pts available\n");
|
||||
return -1;
|
||||
}
|
||||
pts= stream->last_pts + stream->lru_pts_delta[flags&FLAG_PTS];
|
||||
}
|
||||
|
||||
if(size_mul <= size_lsb){
|
||||
size= stream->lru_size[size_lsb - size_mul];
|
||||
}else{
|
||||
if(flags & FLAG_DATA_SIZE)
|
||||
size= size_mul*get_v(bc) + size_lsb;
|
||||
else
|
||||
size= size_lsb;
|
||||
|
||||
if(*key_frame_ret){
|
||||
int64_t av_pts= pts * AV_TIME_BASE * stream->rate_den / stream->rate_num;
|
||||
// av_log(s, AV_LOG_DEBUG, "stream:%d start:%lld pts:%lld length:%lld\n",stream_id, frame_start, av_pts, frame_start - nut->stream[stream_id].last_sync_pos);
|
||||
av_add_index_entry(
|
||||
s->streams[stream_id],
|
||||
frame_start,
|
||||
av_pts,
|
||||
frame_start - nut->stream[stream_id].last_sync_pos,
|
||||
AVINDEX_KEYFRAME);
|
||||
nut->stream[stream_id].last_sync_pos= frame_start;
|
||||
// assert(nut->packet_start == frame_start);
|
||||
}
|
||||
|
||||
assert(size_mul > size_lsb);
|
||||
size= size_lsb;
|
||||
if(flags & FLAG_DATA_SIZE)
|
||||
size+= size_mul*get_v(bc);
|
||||
|
||||
//av_log(s, AV_LOG_DEBUG, "fs:%lld fc:%d ft:%d kf:%d pts:%lld size:%d\n", frame_start, frame_code, frame_type, key_frame, pts, size);
|
||||
|
||||
if(url_ftell(bc) - nut->packet_start + size > nut->written_packet_size){
|
||||
if(frame_type==0 && url_ftell(bc) - nut->packet_start[2] + size > nut->max_distance){
|
||||
av_log(s, AV_LOG_ERROR, "frame size too large\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
*stream_id_ret = stream_id;
|
||||
*pts_ret = pts * AV_TIME_BASE * stream->rate_den / stream->rate_num;
|
||||
|
||||
update(nut, stream_id, frame_start, frame_type, frame_code, *key_frame_ret, size, pts);
|
||||
|
||||
return size;
|
||||
}
|
||||
|
||||
static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code, int frame_type){
|
||||
AVFormatContext *s= nut->avf;
|
||||
ByteIOContext *bc = &s->pb;
|
||||
int size, stream_id, key_frame;
|
||||
int64_t pts;
|
||||
|
||||
size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type);
|
||||
if(size < 0)
|
||||
return -1;
|
||||
|
||||
av_new_packet(pkt, size);
|
||||
get_buffer(bc, pkt->data, size);
|
||||
pkt->stream_index = stream_id;
|
||||
if (key_frame)
|
||||
pkt->flags |= PKT_FLAG_KEY;
|
||||
pkt->pts = pts * AV_TIME_BASE * stream->rate_den / stream->rate_num;
|
||||
pkt->pts = pts;
|
||||
|
||||
update(nut, stream_id, frame_start, frame_type, frame_code, key_frame, size, pts);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -1162,8 +1138,7 @@ static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
|
||||
{
|
||||
NUTContext *nut = s->priv_data;
|
||||
ByteIOContext *bc = &s->pb;
|
||||
int size, i, frame_code=0;
|
||||
int64_t pos;
|
||||
int i, frame_code=0;
|
||||
|
||||
for(;;){
|
||||
int frame_type= 0;
|
||||
@ -1185,8 +1160,8 @@ static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
|
||||
case MAIN_STARTCODE:
|
||||
case STREAM_STARTCODE:
|
||||
case INDEX_STARTCODE:
|
||||
get_packetheader(nut, bc, 8, 0);
|
||||
url_fseek(bc, nut->written_packet_size + nut->packet_start, SEEK_SET);
|
||||
get_packetheader(nut, bc, 0);
|
||||
url_fseek(bc, nut->written_packet_size + nut->packet_start[2], SEEK_SET);
|
||||
break;
|
||||
case INFO_STARTCODE:
|
||||
if(decode_info_header(nut)<0)
|
||||
@ -1200,38 +1175,12 @@ static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
|
||||
return 0;
|
||||
default:
|
||||
resync:
|
||||
av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start+1);
|
||||
tmp= find_any_startcode(bc, nut->packet_start+1);
|
||||
av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start[2]+1);
|
||||
tmp= find_any_startcode(bc, nut->packet_start[2]+1);
|
||||
if(tmp==0)
|
||||
return -1;
|
||||
av_log(s, AV_LOG_DEBUG, "sync\n");
|
||||
if(url_is_streamed(bc)){
|
||||
nut->next_startcode= tmp;
|
||||
break;
|
||||
}
|
||||
|
||||
pos= url_ftell(bc) - 8;
|
||||
av_log(s, AV_LOG_DEBUG, "at %lld code=%llX\n", pos, tmp);
|
||||
if(tmp==KEYFRAME_STARTCODE){
|
||||
get_byte(bc);
|
||||
}
|
||||
get_v(bc);
|
||||
size= get_v(bc);
|
||||
|
||||
while(size > 2 && size < 100000 && nut->packet_start < pos - size){
|
||||
url_fseek(bc, pos - size, SEEK_SET);
|
||||
frame_code= get_byte(bc);
|
||||
if(!(nut->frame_code[ frame_code ].flags & FLAG_FRAME_TYPE))
|
||||
break;
|
||||
if(get_v(bc) != size)
|
||||
break;
|
||||
pos -= size;
|
||||
size= get_v(bc);
|
||||
av_log(s, AV_LOG_DEBUG, "steping back to %lld next %d\n", pos, size);
|
||||
}
|
||||
url_fseek(bc, pos, SEEK_SET);
|
||||
|
||||
nut->written_packet_size= -1;
|
||||
nut->next_startcode= tmp;
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -1242,20 +1191,19 @@ static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index, int64_t
|
||||
ByteIOContext *bc = &s->pb;
|
||||
int64_t pos, pts;
|
||||
uint64_t code;
|
||||
int frame_code,step, flags, stream_id, i;
|
||||
int frame_code,step, stream_id, i,size, key_frame;
|
||||
av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%lld,%lld)\n", stream_index, *pos_arg, pos_limit);
|
||||
|
||||
if(*pos_arg < 0)
|
||||
return AV_NOPTS_VALUE;
|
||||
|
||||
// find a previous startcode, FIXME use forward search and follow backward pointers if undamaged stream
|
||||
pos= *pos_arg;
|
||||
step= FFMIN(16*1024, pos);
|
||||
do{
|
||||
pos-= step;
|
||||
code= find_any_startcode(bc, pos);
|
||||
|
||||
if(code && url_ftell(bc) - 8 < *pos_arg)
|
||||
if(code && url_ftell(bc) - 8 <= *pos_arg)
|
||||
break;
|
||||
step= FFMIN(2*step, pos);
|
||||
}while(step);
|
||||
@ -1268,11 +1216,11 @@ av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%lld,%lld)\n", stream_index, *pos_a
|
||||
nut->stream[i].last_sync_pos= url_ftell(bc);
|
||||
|
||||
for(;;){
|
||||
int frame_type=0;
|
||||
int64_t pos= url_ftell(bc);
|
||||
uint64_t tmp=0;
|
||||
int prefix_len=1;
|
||||
|
||||
if(pos > pos_limit)
|
||||
if(pos > pos_limit || url_feof(bc))
|
||||
return AV_NOPTS_VALUE;
|
||||
|
||||
frame_code = get_byte(bc);
|
||||
@ -1288,53 +1236,30 @@ av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%lld,%lld)\n", stream_index, *pos_a
|
||||
case STREAM_STARTCODE:
|
||||
case INDEX_STARTCODE:
|
||||
case INFO_STARTCODE:
|
||||
nut->written_packet_size= -1;
|
||||
get_packetheader(nut, bc, 8, 0);
|
||||
url_fseek(bc, nut->written_packet_size + nut->packet_start, SEEK_SET);
|
||||
get_packetheader(nut, bc, 0);
|
||||
assert(nut->packet_start[2]==pos);
|
||||
url_fseek(bc, nut->written_packet_size + pos, SEEK_SET);
|
||||
break;
|
||||
case KEYFRAME_STARTCODE:
|
||||
nut->written_packet_size= -1;
|
||||
prefix_len+=8;
|
||||
frame_type=2;
|
||||
frame_code = get_byte(bc);
|
||||
case 0:
|
||||
flags= nut->frame_code[frame_code].flags;
|
||||
stream_id= nut->frame_code[frame_code].stream_id_plus1 - 1;
|
||||
|
||||
if(get_packetheader(nut, bc, prefix_len, 0) < 0)
|
||||
goto resync;
|
||||
|
||||
if(!(flags & FLAG_FRAME_TYPE) || !(flags & FLAG_PTS) || !(flags & FLAG_FULL_PTS))
|
||||
goto resync;
|
||||
|
||||
if(stream_id==-1)
|
||||
stream_id= get_v(bc);
|
||||
if(stream_id >= s->nb_streams)
|
||||
size= decode_frame_header(nut, &key_frame, &pts, &stream_id, frame_code, frame_type);
|
||||
if(size < 0)
|
||||
goto resync;
|
||||
|
||||
stream= &nut->stream[stream_id];
|
||||
pts= get_v(bc) * AV_TIME_BASE * stream->rate_den / stream->rate_num;
|
||||
|
||||
if(flags & FLAG_KEY_FRAME){
|
||||
av_add_index_entry(
|
||||
s->streams[stream_id],
|
||||
pos,
|
||||
pts,
|
||||
pos - nut->stream[stream_id].last_sync_pos,
|
||||
AVINDEX_KEYFRAME);
|
||||
nut->stream[stream_id].last_sync_pos= pos;
|
||||
}
|
||||
if(stream_id != stream_index || !(flags & FLAG_KEY_FRAME) || nut->packet_start < *pos_arg){
|
||||
url_fseek(bc, nut->written_packet_size + nut->packet_start, SEEK_SET);
|
||||
if(stream_id != stream_index || !key_frame || pos < *pos_arg){
|
||||
url_fseek(bc, size, SEEK_CUR);
|
||||
break;
|
||||
}
|
||||
|
||||
*pos_arg= nut->packet_start;
|
||||
assert(nut->packet_start == pos);
|
||||
*pos_arg= pos;
|
||||
return pts;
|
||||
default:
|
||||
resync:
|
||||
av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start+1);
|
||||
if(!find_any_startcode(bc, nut->packet_start+1))
|
||||
av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start[2]+1);
|
||||
if(!find_any_startcode(bc, nut->packet_start[2]+1))
|
||||
return AV_NOPTS_VALUE;
|
||||
|
||||
url_fseek(bc, -8, SEEK_CUR);
|
||||
@ -1344,17 +1269,14 @@ av_log(s, AV_LOG_DEBUG, "syncing from %lld\n", nut->packet_start+1);
|
||||
}
|
||||
|
||||
static int nut_read_seek(AVFormatContext *s, int stream_index, int64_t target_ts){
|
||||
NUTContext *nut = s->priv_data;
|
||||
// NUTContext *nut = s->priv_data;
|
||||
int64_t pos;
|
||||
int i;
|
||||
|
||||
if(av_seek_frame_binary(s, stream_index, target_ts) < 0)
|
||||
return -1;
|
||||
|
||||
nut->written_packet_size= -1;
|
||||
pos= url_ftell(&s->pb);
|
||||
for(i=0; i<s->nb_streams; i++)
|
||||
nut->stream[i].last_sync_pos= pos;
|
||||
nut_read_timestamp(s, stream_index, &pos, pos-1);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user