transrate.h
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上传日期:2009-03-27
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- /*****************************************************************************
- * transrate.h: MPEG2 video transrating module
- *****************************************************************************
- * Copyright (C) 2003 VideoLAN
- * Copyright (C) 2003 Antoine Missout
- * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
- * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
- * $Id: transrate.h 7411 2004-04-21 15:54:09Z massiot $
- *
- * Authors: Christophe Massiot <massiot@via.ecp.fr>
- * Laurent Aimar <fenrir@via.ecp.fr>
- * Antoine Missout
- * Michel Lespinasse <walken@zoy.org>
- * Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
- *****************************************************************************/
- /*****************************************************************************
- * sout_stream_id_t:
- *****************************************************************************/
- typedef struct
- {
- uint8_t run;
- short level;
- } RunLevel;
- typedef struct
- {
- uint8_t *p_c;
- uint8_t *p_r;
- uint8_t *p_w;
- uint8_t *p_ow;
- uint8_t *p_rw;
- int i_bit_in;
- int i_bit_out;
- uint32_t i_bit_in_cache;
- uint32_t i_bit_out_cache;
- uint32_t i_byte_in;
- uint32_t i_byte_out;
- } bs_transrate_t;
- typedef struct
- {
- bs_transrate_t bs;
- /* MPEG2 state */
- // seq header
- unsigned int horizontal_size_value;
- unsigned int vertical_size_value;
- uint8_t intra_quantizer_matrix [64];
- uint8_t non_intra_quantizer_matrix [64];
- int mpeg4_matrix;
- // pic header
- unsigned int picture_coding_type;
- // pic code ext
- unsigned int f_code[2][2];
- /* unsigned int intra_dc_precision; */
- unsigned int picture_structure;
- unsigned int frame_pred_frame_dct;
- unsigned int concealment_motion_vectors;
- unsigned int q_scale_type;
- unsigned int intra_vlc_format;
- const uint8_t * scan;
- // slice or mb
- // quantizer_scale_code
- unsigned int quantizer_scale;
- unsigned int new_quantizer_scale;
- unsigned int last_coded_scale;
- int h_offset, v_offset;
- vlc_bool_t b_error;
- // mb
- double qrate;
- int i_admissible_error, i_minimum_error;
- /* input buffers */
- ssize_t i_total_input, i_remaining_input;
- /* output buffers */
- ssize_t i_current_output, i_wanted_output;
- } transrate_t;
- struct sout_stream_id_t
- {
- void *id;
- vlc_bool_t b_transrate;
- block_t *p_current_buffer;
- block_t *p_next_gop;
- mtime_t i_next_gop_duration;
- size_t i_next_gop_size;
- transrate_t tr;
- };
- #ifdef HAVE_BUILTIN_EXPECT
- #define likely(x) __builtin_expect ((x) != 0, 1)
- #define unlikely(x) __builtin_expect ((x) != 0, 0)
- #else
- #define likely(x) (x)
- #define unlikely(x) (x)
- #endif
- #define BITS_IN_BUF (8)
- #define LOG(msg) fprintf (stderr, msg)
- #define LOGF(format, args...) fprintf (stderr, format, args)
- static inline void bs_write( bs_transrate_t *s, unsigned int val, int n )
- {
- assert(n < 32);
- assert(!(val & (0xffffffffU << n)));
- while (unlikely(n >= s->i_bit_out))
- {
- s->p_w[0] = (s->i_bit_out_cache << s->i_bit_out ) | (val >> (n - s->i_bit_out));
- s->p_w++;
- n -= s->i_bit_out;
- s->i_bit_out_cache = 0;
- val &= ~(0xffffffffU << n);
- s->i_bit_out = BITS_IN_BUF;
- }
- if (likely(n))
- {
- s->i_bit_out_cache = (s->i_bit_out_cache << n) | val;
- s->i_bit_out -= n;
- }
- assert(s->i_bit_out > 0);
- assert(s->i_bit_out <= BITS_IN_BUF);
- }
- static inline void bs_refill( bs_transrate_t *s )
- {
- assert((s->p_r - s->p_c) >= 1);
- s->i_bit_in_cache |= s->p_c[0] << (24 - s->i_bit_in);
- s->i_bit_in += 8;
- s->p_c++;
- }
- static inline void bs_flush( bs_transrate_t *s, unsigned int n )
- {
- assert(s->i_bit_in >= n);
- s->i_bit_in_cache <<= n;
- s->i_bit_in -= n;
- assert( (!n) || ((n>0) && !(s->i_bit_in_cache & 0x1)) );
- while (unlikely(s->i_bit_in < 24)) bs_refill( s );
- }
- static inline unsigned int bs_read( bs_transrate_t *s, unsigned int n )
- {
- unsigned int Val = ((unsigned int)s->i_bit_in_cache) >> (32 - n);
- bs_flush( s, n );
- return Val;
- }
- static inline unsigned int bs_copy( bs_transrate_t *s, unsigned int n )
- {
- unsigned int Val = bs_read( s, n);
- bs_write(s, Val, n);
- return Val;
- }
- static inline void bs_flush_read( bs_transrate_t *s )
- {
- int i = s->i_bit_in & 0x7;
- if( i )
- {
- assert(((unsigned int)s->i_bit_in_cache) >> (32 - i) == 0);
- s->i_bit_in_cache <<= i;
- s->i_bit_in -= i;
- }
- s->p_c += -1 * (s->i_bit_in >> 3);
- s->i_bit_in = 0;
- }
- static inline void bs_flush_write( bs_transrate_t *s )
- {
- if( s->i_bit_out != 8 ) bs_write(s, 0, s->i_bit_out);
- }
- int scale_quant( transrate_t *tr, double qrate );
- int transrate_mb( transrate_t *tr, RunLevel blk[6][65], RunLevel new_blk[6][65], int i_cbp, int intra );
- void get_intra_block_B14( transrate_t *tr, RunLevel *blk );
- void get_intra_block_B15( transrate_t *tr, RunLevel *blk );
- int get_non_intra_block( transrate_t *tr, RunLevel *blk );
- void putnonintrablk( bs_transrate_t *bs, RunLevel *blk);
- void putintrablk( bs_transrate_t *bs, RunLevel *blk, int vlcformat);
- int process_frame( sout_stream_t *p_stream, sout_stream_id_t *id,
- block_t *in, block_t **out, int i_handicap );