mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2025-01-24 13:56:33 +02:00
resync marker support, needed for some mp4 files
Originally committed as revision 358 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
parent
122546a6d1
commit
490922441b
@ -200,6 +200,8 @@ typedef struct GetBitContext {
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int size;
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} GetBitContext;
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static inline int get_bits_count(GetBitContext *s);
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typedef struct VLC {
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int bits;
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INT16 *table_codes;
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@ -551,6 +553,43 @@ static inline unsigned int show_bits(GetBitContext *s, int n)
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#endif //!ALT_BITSTREAM_READER
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}
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static inline int show_aligned_bits(GetBitContext *s, int offset, int n)
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{
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#ifdef ALT_BITSTREAM_READER
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#ifdef ALIGNED_BITSTREAM
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int index= (s->index + offset + 7)&(~7);
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uint32_t result1= be2me_32( ((uint32_t *)s->buffer)[index>>5] );
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uint32_t result2= be2me_32( ((uint32_t *)s->buffer)[(index>>5) + 1] );
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#ifdef ARCH_X86
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asm ("shldl %%cl, %2, %0\n\t"
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: "=r" (result1)
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: "0" (result1), "r" (result2), "c" (index));
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#else
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result1<<= (index&0x1F);
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result2= (result2>>1) >> (31-(index&0x1F));
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result1|= result2;
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#endif
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result1>>= 32 - n;
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return result1;
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#else //ALIGNED_BITSTREAM
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int index= (s->index + offset + 7)>>3;
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uint32_t result= be2me_32( unaligned32( ((uint8_t *)s->buffer)+index ) );
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result>>= 32 - n;
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return result;
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#endif //!ALIGNED_BITSTREAM
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#else //ALT_BITSTREAM_READER
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int index= (get_bits_count(s) + offset + 7)>>3;
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uint32_t result= be2me_32( unaligned32( ((uint8_t *)s->buf)+index ) );
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result>>= 32 - n;
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//printf(" %X %X %d \n", (int)(((uint8_t *)s->buf)+index ), (int)s->buf_ptr, s->bit_cnt);
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return result;
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#endif //!ALT_BITSTREAM_READER
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}
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static inline void skip_bits(GetBitContext *s, int n){
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#ifdef ALT_BITSTREAM_READER
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s->index+= n;
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@ -31,6 +31,8 @@
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#define RDIV(a,b) ((a) > 0 ? ((a)+((b)>>1))/(b) : ((a)-((b)>>1))/(b))
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#define RSHIFT(a,b) ((a) > 0 ? ((a) + (1<<((b)-1)))>>(b) : ((a) + (1<<((b)-1))-1)>>(b))
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#define ABS(a) (((a)>=0)?(a):(-(a)))
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#define MAX(a,b) ((a) > (b) ? (a) : (b))
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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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static void h263_encode_block(MpegEncContext * s, DCTELEM * block,
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int n);
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@ -47,6 +49,8 @@ static int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
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static inline int mpeg4_pred_dc(MpegEncContext * s, int n, UINT16 **dc_val_ptr, int *dir_ptr);
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static void mpeg4_inv_pred_ac(MpegEncContext * s, INT16 *block, int n,
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int dir);
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static void mpeg4_decode_sprite_trajectory(MpegEncContext * s);
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extern UINT32 inverse[256];
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static UINT16 mv_penalty[MAX_FCODE][MAX_MV*2+1];
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@ -1262,6 +1266,135 @@ int h263_decode_gob_header(MpegEncContext *s)
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}
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static inline void memsetw(short *tab, int val, int n)
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{
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int i;
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for(i=0;i<n;i++)
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tab[i] = val;
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}
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static int mpeg4_resync(MpegEncContext *s)
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{
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int state, v, bits;
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int mb_num_bits= av_log2(s->mb_num - 1) + 1;
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int header_extension=0, mb_num;
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int c_wrap, c_xy, l_wrap, l_xy;
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//printf("resync at %d %d\n", s->mb_x, s->mb_y);
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//printf("%X\n", show_bits(&s->gb, 24));
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if( get_bits_count(&s->gb) > s->gb.size*8-32)
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return 0;
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align_get_bits(&s->gb);
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state = 0xff;
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for(;;) {
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v = get_bits(&s->gb, 8);
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//printf("%X ", v);
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state = ((state << 8) | v) & 0xffff;
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if (state == 0) break;
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if( get_bits_count(&s->gb) > s->gb.size*8-32){
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printf("resync failed\n");
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return -1;
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}
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}
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//printf("%X\n", show_bits(&s->gb, 24));
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bits=0;
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while(!get_bits1(&s->gb) && bits<30) bits++;
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if(s->pict_type == P_TYPE && bits != s->f_code-1)
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printf("marker does not match f_code\n");
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//FIXME check bits for B-framess
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//printf("%X\n", show_bits(&s->gb, 24));
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if(s->shape != RECT_SHAPE){
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header_extension= get_bits1(&s->gb);
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//FIXME more stuff here
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}
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mb_num= get_bits(&s->gb, mb_num_bits);
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if(mb_num != s->mb_x + s->mb_y*s->mb_width){
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printf("MB-num change not supported %d %d\n", mb_num, s->mb_x + s->mb_y*s->mb_width);
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// s->mb_x= mb_num % s->mb_width;
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// s->mb_y= mb_num / s->mb_width;
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//FIXME many vars are wrong now
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}
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if(s->shape != BIN_ONLY_SHAPE){
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s->qscale= get_bits(&s->gb, 5);
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h263_dc_scale(s);
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}
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if(s->shape == RECT_SHAPE){
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header_extension= get_bits1(&s->gb);
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}
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if(header_extension){
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int time_incr=0;
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printf("header extension not really supported\n");
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while (get_bits1(&s->gb) != 0)
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time_incr++;
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check_marker(&s->gb, "before time_increment in video packed header");
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s->time_increment= get_bits(&s->gb, s->time_increment_bits);
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if(s->pict_type!=B_TYPE){
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s->time_base+= time_incr;
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s->last_non_b_time[1]= s->last_non_b_time[0];
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s->last_non_b_time[0]= s->time_base*s->time_increment_resolution + s->time_increment;
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}else{
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s->time= (s->last_non_b_time[1]/s->time_increment_resolution + time_incr)*s->time_increment_resolution;
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s->time+= s->time_increment;
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}
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check_marker(&s->gb, "before vop_coding_type in video packed header");
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skip_bits(&s->gb, 2); /* vop coding type */
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//FIXME not rect stuff here
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if(s->shape != BIN_ONLY_SHAPE){
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skip_bits(&s->gb, 3); /* intra dc vlc threshold */
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if(s->pict_type == S_TYPE && s->vol_sprite_usage==GMC_SPRITE && s->num_sprite_warping_points){
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mpeg4_decode_sprite_trajectory(s);
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}
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//FIXME reduced res stuff here
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if (s->pict_type != I_TYPE) {
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s->f_code = get_bits(&s->gb, 3); /* fcode_for */
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if(s->f_code==0){
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printf("Error, video packet header damaged or not MPEG4 header (f_code=0)\n");
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return -1; // makes no sense to continue, as the MV decoding will break very quickly
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}
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}
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if (s->pict_type == B_TYPE) {
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s->b_code = get_bits(&s->gb, 3);
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}
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}
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}
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//FIXME new-pred stuff
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l_wrap= s->block_wrap[0];
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l_xy= s->mb_y*l_wrap*2;
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c_wrap= s->block_wrap[4];
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c_xy= s->mb_y*c_wrap;
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/* clean DC */
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memsetw(s->dc_val[0] + l_xy, 1024, l_wrap*3);
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memsetw(s->dc_val[1] + c_xy, 1024, c_wrap*2);
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memsetw(s->dc_val[2] + c_xy, 1024, c_wrap*2);
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/* clean AC */
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memset(s->ac_val[0] + l_xy, 0, l_wrap*3*16*sizeof(INT16));
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memset(s->ac_val[1] + c_xy, 0, c_wrap*2*16*sizeof(INT16));
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memset(s->ac_val[2] + c_xy, 0, c_wrap*2*16*sizeof(INT16));
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/* clean MV */
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memset(s->motion_val + l_xy, 0, l_wrap*3*2*sizeof(INT16));
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// memset(s->motion_val, 0, 2*sizeof(INT16)*(2 + s->mb_width*2)*(2 + s->mb_height*2));
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s->resync_x_pos= s->mb_x;
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s->first_slice_line=1;
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return 0;
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}
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int h263_decode_mb(MpegEncContext *s,
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DCTELEM block[6][64])
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{
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@ -1269,6 +1402,27 @@ int h263_decode_mb(MpegEncContext *s,
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INT16 *mot_val;
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static INT8 quant_tab[4] = { -1, -2, 1, 2 };
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if(s->resync_marker){
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if( s->resync_x_pos == s->mb_x+1
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|| s->resync_x_pos == s->mb_x){
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/* f*ck mpeg4
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this is here so we dont need to slowdown h263_pred_motion with it */
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if(s->resync_x_pos == s->mb_x+1 && s->mb_x==0){
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int xy= s->block_index[0] - s->block_wrap[0];
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s->motion_val[xy][0]= s->motion_val[xy+2][0];
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s->motion_val[xy][1]= s->motion_val[xy+2][1];
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}
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s->first_slice_line=0;
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s->resync_x_pos=0; // isnt needed but for cleanness sake ;)
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}
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if(show_aligned_bits(&s->gb, 1, 16) == 0){
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if( mpeg4_resync(s) < 0 ) return -1;
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}
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}
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if (s->pict_type == P_TYPE || s->pict_type==S_TYPE) {
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if (get_bits1(&s->gb)) {
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/* skip mb */
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@ -1322,6 +1476,7 @@ int h263_decode_mb(MpegEncContext *s,
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s->qscale = 1;
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else if (s->qscale > 31)
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s->qscale = 31;
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h263_dc_scale(s);
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}
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s->mv_dir = MV_DIR_FORWARD;
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if ((cbpc & 16) == 0) {
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@ -1441,6 +1596,7 @@ int h263_decode_mb(MpegEncContext *s,
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s->qscale = 1;
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else if (s->qscale > 31)
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s->qscale = 31;
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h263_dc_scale(s);
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}
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}
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}else{
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@ -1526,6 +1682,7 @@ intra:
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s->qscale = 1;
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else if (s->qscale > 31)
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s->qscale = 31;
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h263_dc_scale(s);
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}
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}
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@ -2250,6 +2407,7 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
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if (get_bits1(&s->gb) == 1) { /* not_8_bit */
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s->quant_precision = get_bits(&s->gb, 4); /* quant_precision */
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if(get_bits(&s->gb, 4)!=8) printf("N-bit not supported\n"); /* bits_per_pixel */
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if(s->quant_precision!=5) printf("quant precission %d\n", s->quant_precision);
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} else {
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s->quant_precision = 5;
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}
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@ -2261,11 +2419,9 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
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else s->quarter_sample=0;
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if(!get_bits1(&s->gb)) printf("Complexity estimation not supported\n");
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#if 0
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if(get_bits1(&s->gb)) printf("resync disable\n");
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#else
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skip_bits1(&s->gb); /* resync_marker_disabled */
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#endif
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s->resync_marker= !get_bits1(&s->gb); /* resync_marker_disabled */
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s->data_partioning= get_bits1(&s->gb);
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if(s->data_partioning){
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printf("data partitioning not supported\n");
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@ -2387,7 +2543,9 @@ int mpeg4_decode_picture_header(MpegEncContext * s)
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//FIXME complexity estimation stuff
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if (s->shape != BIN_ONLY_SHAPE) {
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skip_bits(&s->gb, 3); /* intra dc VLC threshold */
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int t;
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t=get_bits(&s->gb, 3); /* intra dc VLC threshold */
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//printf("threshold %d\n", t);
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//FIXME interlaced specific bits
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}
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@ -230,6 +230,8 @@ typedef struct MpegEncContext {
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int sprite_warping_accuracy;
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int low_latency_sprite;
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int data_partioning;
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int resync_marker;
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int resync_x_pos;
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/* divx specific, used to workaround (many) bugs in divx5 */
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int divx_version;
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@ -253,7 +255,7 @@ typedef struct MpegEncContext {
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int dc_table_index;
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int use_skip_mb_code;
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int slice_height; /* in macroblocks */
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int first_slice_line;
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int first_slice_line; /* used in mpeg4 too to handle resync markers */
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int flipflop_rounding;
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int bitrate;
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/* decompression specific */
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