Libav
Data Structures | Functions
put_bits.h File Reference

bitstream writer API More...

#include <stdint.h>
#include <stddef.h>
#include <assert.h>
#include "libavutil/intreadwrite.h"

Go to the source code of this file.

Data Structures

struct  PutBitContext
 

Functions

static void init_put_bits (PutBitContext *s, uint8_t *buffer, int buffer_size)
 Initialize the PutBitContext s. More...
 
static int put_bits_count (PutBitContext *s)
 
static int put_bits_left (PutBitContext *s)
 
static void flush_put_bits (PutBitContext *s)
 Pad the end of the output stream with zeros. More...
 
void avpriv_align_put_bits (PutBitContext *s)
 Pad the bitstream with zeros up to the next byte boundary. More...
 
void avpriv_put_string (PutBitContext *pb, const char *string, int terminate_string)
 Put the string string in the bitstream. More...
 
void avpriv_copy_bits (PutBitContext *pb, const uint8_t *src, int length)
 Copy the content of src to the bitstream. More...
 
static void put_bits (PutBitContext *s, int n, unsigned int value)
 Write up to 31 bits into a bitstream. More...
 
static void put_sbits (PutBitContext *pb, int n, int32_t value)
 
static void av_unused put_bits32 (PutBitContext *s, uint32_t value)
 Write exactly 32 bits into a bitstream. More...
 
static uint8_tput_bits_ptr (PutBitContext *s)
 Return the pointer to the byte where the bitstream writer will put the next bit. More...
 
static void skip_put_bytes (PutBitContext *s, int n)
 Skip the given number of bytes. More...
 
static void skip_put_bits (PutBitContext *s, int n)
 Skip the given number of bits. More...
 
static void set_put_bits_buffer_size (PutBitContext *s, int size)
 Change the end of the buffer. More...
 

Detailed Description

bitstream writer API

Definition in file put_bits.h.

Function Documentation

static void init_put_bits ( PutBitContext s,
uint8_t buffer,
int  buffer_size 
)
inlinestatic
static int put_bits_count ( PutBitContext s)
inlinestatic
static int put_bits_left ( PutBitContext s)
inlinestatic
Returns
the number of bits available in the bitstream.

Definition at line 75 of file put_bits.h.

Referenced by dv_encode_ac(), encode_slice(), and save_bits().

static void flush_put_bits ( PutBitContext s)
inlinestatic
void avpriv_align_put_bits ( PutBitContext s)
void avpriv_put_string ( PutBitContext pb,
const char *  string,
int  terminate_string 
)

Put the string string in the bitstream.

Parameters
terminate_string0-terminates the written string if value is 1

Definition at line 50 of file bitstream.c.

Referenced by jpeg_put_comments(), and mpeg4_encode_vol_header().

void avpriv_copy_bits ( PutBitContext pb,
const uint8_t src,
int  length 
)

Copy the content of src to the bitstream.

Parameters
lengththe number of bits of src to copy

Definition at line 61 of file bitstream.c.

Referenced by copy_bits(), encode_thread(), ff_mpeg4_merge_partitions(), latm_write_frame_header(), merge_context_after_encode(), save_bits(), and svq1_encode_plane().

static void put_bits ( PutBitContext s,
int  n,
unsigned int  value 
)
inlinestatic

Write up to 31 bits into a bitstream.

Use put_bits32 to write 32 bits.

Definition at line 134 of file put_bits.h.

Referenced by aac_adtstoasc_filter(), aac_encode_frame(), ac3_output_frame_header(), adpcm_encode_frame(), adts_decode_extradata(), adts_write_frame_header(), asv1_encode_block(), asv1_put_level(), asv2_encode_block(), asv2_put_bits(), asv2_put_level(), avpriv_align_put_bits(), avpriv_copy_bits(), avpriv_put_string(), bit_copy(), codebook_trellis_rate(), copy_bits(), dnxhd_encode_block(), dnxhd_encode_dc(), dnxhd_encode_thread(), dv_encode_ac(), dv_encode_video_segment(), encode_422_bitstream(), encode_bitstream(), encode_block(), encode_dc(), encode_exp_vlc(), encode_ext_header(), encode_frame(), encode_individual_channel(), encode_line(), encode_mb_skip_run(), encode_ms_info(), encode_picture_ls(), encode_pulses(), encode_scalar(), encode_scale_factors(), encode_superframe(), encode_vlc_codeword(), encode_window_bands_info(), ff_dca_convert_bitstream(), ff_eac3_output_frame_header(), ff_flv2_encode_ac_esc(), ff_flv_encode_picture_header(), ff_h261_encode_mb(), ff_h261_encode_picture_header(), ff_h263_encode_gob_header(), ff_h263_encode_mb(), ff_h263_encode_mba(), ff_h263_encode_motion(), ff_h263_encode_picture_header(), ff_mjpeg_encode_dc(), ff_mjpeg_encode_picture_header(), ff_mjpeg_encode_stuffing(), ff_mjpeg_find_marker(), ff_mpeg1_encode_picture_header(), ff_mpeg1_encode_slice_header(), ff_mpeg4_encode_mb(), ff_mpeg4_encode_picture_header(), ff_mpeg4_encode_video_packet_header(), ff_mpeg4_merge_partitions(), ff_mpeg4_stuffing(), ff_mpv_encode_picture(), ff_msmpeg4_code012(), ff_msmpeg4_encode_block(), ff_msmpeg4_encode_ext_header(), ff_msmpeg4_encode_mb(), ff_msmpeg4_encode_motion(), ff_msmpeg4_encode_picture_header(), ff_rv10_encode_picture_header(), ff_rv20_encode_picture_header(), ff_wmv2_encode_mb(), ff_wmv2_encode_picture_header(), ff_write_quant_matrix(), floor_encode(), gif_image_write_image(), h261_encode_block(), h261_encode_gob_header(), h261_encode_motion(), h263_encode_block(), h263p_encode_umotion(), jpeg_put_comments(), jpeg_table_header(), latm_write_frame_header(), latm_write_packet(), ls_encode_run(), ls_store_lse(), main(), mov_write_ac3_tag(), mov_write_dvc1_structs(), mpeg1_encode_block(), mpeg1_encode_mb_internal(), mpeg1_encode_motion(), mpeg1_encode_sequence_header(), mpeg4_encode_block(), mpeg4_encode_dc(), mpeg4_encode_gop_header(), mpeg4_encode_visual_object_header(), mpeg4_encode_vol_header(), msmpeg4_encode_dc(), msmpeg4v2_encode_motion(), output_audio_block(), pnm_decode_frame(), put_alpha_diff(), put_alpha_run(), put_audio_specific_config(), put_bits32(), put_bitstream_info(), put_codebook_header(), put_codeword(), put_floor_header(), put_header(), put_huffman_table(), put_ics_info(), put_main_header(), put_marker(), put_mb_modes(), put_pack_header(), put_qscale(), put_residue_header(), put_sbits(), put_swf_line_edge(), put_swf_matrix(), put_swf_rect(), put_system_header(), put_xsub_rle(), quantize_and_encode_band_cost_template(), ra144_encode_frame(), ra144_encode_subblock(), save_bits(), send_mode_a(), send_mode_b(), set_te_golomb(), set_ue_golomb(), set_ur_golomb(), set_ur_golomb_jpegls(), svq1_encode_frame(), svq1_encode_plane(), svq1_write_header(), swf_write_header(), vorbis_encode_frame(), write_element(), write_element_header(), write_frame(), write_frame_footer(), write_frame_header(), write_huff_codes(), write_streaminfo(), write_subframes(), and write_utf8().

static void put_sbits ( PutBitContext pb,
int  n,
int32_t  value 
)
inlinestatic
static void av_unused put_bits32 ( PutBitContext s,
uint32_t  value 
)
static

Write exactly 32 bits into a bitstream.

Definition at line 182 of file put_bits.h.

Referenced by dv_decode_video_segment(), mov_write_dvc1_structs(), put_float(), put_main_header(), put_pack_header(), put_system_header(), and write_element_header().

static uint8_t* put_bits_ptr ( PutBitContext s)
inlinestatic
static void skip_put_bytes ( PutBitContext s,
int  n 
)
inlinestatic

Skip the given number of bytes.

PutBitContext must be flushed & aligned to a byte boundary before calling this.

Definition at line 208 of file put_bits.h.

Referenced by avpriv_copy_bits(), and escape_FF().

static void skip_put_bits ( PutBitContext s,
int  n 
)
inlinestatic

Skip the given number of bits.

Must only be used if the actual values in the bitstream do not matter. If n is 0 the behavior is undefined.

Definition at line 220 of file put_bits.h.

Referenced by ff_h263_encode_motion_vector(), and mpeg4_encode_blocks().

static void set_put_bits_buffer_size ( PutBitContext s,
int  size 
)
inlinestatic

Change the end of the buffer.

Parameters
sizethe new size in bytes of the buffer where to put bits

Definition at line 232 of file put_bits.h.

Referenced by ff_mpeg4_init_partitions(), and ff_mpeg4_merge_partitions().