hvirtual/quicktime/ffmpeg/libavcodec/parser.c File Reference

#include "avcodec.h"
#include "mpegvideo.h"
#include "mpegaudio.h"

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Go to the source code of this file.

Data Structures

struct  ParseContext1
struct  MpegAudioParseContext

Defines

#define PICTURE_START_CODE   0x00000100
#define SEQ_START_CODE   0x000001b3
#define EXT_START_CODE   0x000001b5
#define SLICE_MIN_START_CODE   0x00000101
#define SLICE_MAX_START_CODE   0x000001af
#define MPEG1_FRAME_RATE_BASE   1001
#define MPA_HEADER_SIZE   4
#define SAME_HEADER_MASK   (0xffe00000 | (3 << 17) | (3 << 10) | (3 << 19))

Functions

void av_register_codec_parser (AVCodecParser *parser)
AVCodecParserContext * av_parser_init (int codec_id)
int av_parser_parse (AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts)
int av_parser_change (AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
void av_parser_close (AVCodecParserContext *s)
int ff_combine_frame (ParseContext *pc, int next, uint8_t **buf, int *buf_size)
static int find_start_code (const uint8_t **pbuf_ptr, const uint8_t *buf_end)
static void mpegvideo_extract_headers (AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t *buf, int buf_size)
static int mpegvideo_parse (AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
static int mpegvideo_split (AVCodecContext *avctx, const uint8_t *buf, int buf_size)
void ff_parse_close (AVCodecParserContext *s)
static void parse1_close (AVCodecParserContext *s)
static int av_mpeg4_decode_header (AVCodecParserContext *s1, AVCodecContext *avctx, const uint8_t *buf, int buf_size)
static int mpeg4video_parse_init (AVCodecParserContext *s)
static int mpeg4video_parse (AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
static int mpeg4video_split (AVCodecContext *avctx, const uint8_t *buf, int buf_size)
static int mpegaudio_parse_init (AVCodecParserContext *s1)
static int mpegaudio_parse (AVCodecParserContext *s1, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)

Variables

AVCodecParser * av_first_parser = NULL
static const int frame_rate_tab [16]
AVCodecParser mpegvideo_parser
AVCodecParser mpeg4video_parser
AVCodecParser mpegaudio_parser

Define Documentation

#define EXT_START_CODE   0x000001b5

Definition at line 195 of file parser.c.

#define MPA_HEADER_SIZE   4

Definition at line 572 of file parser.c.

Referenced by mpegaudio_parse().

#define MPEG1_FRAME_RATE_BASE   1001

Definition at line 297 of file parser.c.

Referenced by mpegvideo_extract_headers().

#define PICTURE_START_CODE   0x00000100

Definition at line 193 of file parser.c.

#define SAME_HEADER_MASK   (0xffe00000 | (3 << 17) | (3 << 10) | (3 << 19))

Definition at line 576 of file parser.c.

#define SEQ_START_CODE   0x000001b3

Definition at line 194 of file parser.c.

#define SLICE_MAX_START_CODE   0x000001af

Definition at line 197 of file parser.c.

#define SLICE_MIN_START_CODE   0x00000101

Definition at line 196 of file parser.c.

Function Documentation

static int av_mpeg4_decode_header ( AVCodecParserContext *  s1,
AVCodecContext *  avctx,
const uint8_t *  buf,
int  buf_size 
) [static]

Definition at line 487 of file parser.c.

References avcodec_set_dimensions(), MpegEncContext::avctx, MpegEncContext::current_picture, MpegEncContext::current_picture_ptr, ParseContext1::enc, AVCodecContext::extradata, AVCodecContext::extradata_size, ff_mpeg4_decode_picture_header(), ParseContext1::first_picture, MpegEncContext::height, init_get_bits(), AVCodecParserContext::priv_data, s, and MpegEncContext::width.

Referenced by mpeg4video_parse().

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int av_parser_change ( AVCodecParserContext *  s,
AVCodecContext *  avctx,
uint8_t **  poutbuf,
int *  poutbuf_size,
const uint8_t *  buf,
int  buf_size,
int  keyframe 
)

Returns:
0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed

Definition at line 149 of file parser.c.

References av_malloc(), CODEC_FLAG2_LOCAL_HEADER, CODEC_FLAG_GLOBAL_HEADER, AVCodecContext::extradata, AVCodecContext::extradata_size, FF_INPUT_BUFFER_PADDING_SIZE, AVCodecContext::flags, AVCodecContext::flags2, memcpy, AVCodecParserContext::parser, and AVCodecParser::split.

Referenced by output_packet().

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void av_parser_close ( AVCodecParserContext *  s  ) 

Definition at line 181 of file parser.c.

References av_free(), AVCodecParserContext::parser, AVCodecParser::parser_close, and AVCodecParserContext::priv_data.

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AVCodecParserContext* av_parser_init ( int  codec_id  ) 

Definition at line 32 of file parser.c.

References av_free(), av_mallocz(), CODEC_ID_NONE, AVCodecParser::codec_ids, AVCodecParserContext::fetch_timestamp, AVCodecParser::next, NULL, AVCodecParserContext::parser, AVCodecParser::parser_init, AVCodecParserContext::priv_data, AVCodecParser::priv_data_size, and s.

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int av_parser_parse ( AVCodecParserContext *  s,
AVCodecContext *  avctx,
uint8_t **  poutbuf,
int *  poutbuf_size,
const uint8_t *  buf,
int  buf_size,
int64_t  pts,
int64_t  dts 
)

Definition at line 74 of file parser.c.

References AV_NOPTS_VALUE, AV_PARSER_PTS_NB, AVCodecParserContext::cur_frame_dts, AVCodecParserContext::cur_frame_offset, AVCodecParserContext::cur_frame_pts, AVCodecParserContext::cur_frame_start_index, AVCodecParserContext::cur_offset, AVCodecParserContext::dts, AVCodecParserContext::fetch_timestamp, FF_INPUT_BUFFER_PADDING_SIZE, AVCodecParserContext::frame_offset, AVCodecParserContext::last_dts, AVCodecParserContext::last_frame_offset, AVCodecParserContext::last_pts, AVCodecParserContext::parser, AVCodecParser::parser_parse, and AVCodecParserContext::pts.

void av_register_codec_parser ( AVCodecParser *  parser  ) 

Definition at line 26 of file parser.c.

References AVCodecParser::next.

Referenced by avcodec_register_all().

int ff_combine_frame ( ParseContext *  pc,
int  next,
uint8_t **  buf,
int *  buf_size 
)

combines the (truncated) bitstream to a complete frame

Returns:
-1 if no complete frame could be created

Definition at line 216 of file parser.c.

References av_fast_realloc(), ParseContext::buffer, ParseContext::buffer_size, END_NOT_FOUND, FF_INPUT_BUFFER_PADDING_SIZE, ParseContext::index, ParseContext::last_index, memcpy, ParseContext::overread, ParseContext::overread_index, and ParseContext::state.

Referenced by decode_frame(), ff_h263_decode_frame(), h261_parse(), h263_parse(), h264_parse(), jpeg_parse(), mpeg4video_parse(), mpeg_decode_frame(), mpegvideo_parse(), and pnm_parse().

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void ff_parse_close ( AVCodecParserContext *  s  ) 

Definition at line 468 of file parser.c.

References av_free(), ParseContext::buffer, and AVCodecParserContext::priv_data.

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static int find_start_code ( const uint8_t **  pbuf_ptr,
const uint8_t *  buf_end 
) [static]

Definition at line 274 of file parser.c.

static int mpeg4video_parse ( AVCodecParserContext *  s,
AVCodecContext *  avctx,
uint8_t **  poutbuf,
int *  poutbuf_size,
const uint8_t *  buf,
int  buf_size 
) [static]

Definition at line 524 of file parser.c.

References av_mpeg4_decode_header(), ff_combine_frame(), ff_mpeg4_find_frame_end(), NULL, and AVCodecParserContext::priv_data.

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static int mpeg4video_parse_init ( AVCodecParserContext *  s  )  [static]

Definition at line 513 of file parser.c.

References av_mallocz(), ParseContext1::enc, ParseContext1::first_picture, and AVCodecParserContext::priv_data.

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static int mpeg4video_split ( AVCodecContext *  avctx,
const uint8_t *  buf,
int  buf_size 
) [static]

Definition at line 546 of file parser.c.

static int mpegaudio_parse ( AVCodecParserContext *  s1,
AVCodecContext *  avctx,
uint8_t **  poutbuf,
int *  poutbuf_size,
const uint8_t *  buf,
int  buf_size 
) [static]

Definition at line 586 of file parser.c.

References decode_header(), MpegAudioParseContext::frame_size, MpegAudioParseContext::free_format_frame_size, MpegAudioParseContext::free_format_next_header, MpegAudioParseContext::header, header, MpegAudioParseContext::header_count, MpegAudioParseContext::inbuf, MpegAudioParseContext::inbuf_ptr, memcpy, mpa_decode_header(), MPA_HEADER_SIZE, MPA_MAX_CODED_FRAME_SIZE, NULL, AVCodecParserContext::priv_data, s, SAME_HEADER_MASK, and AVCodecContext::sample_rate.

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static int mpegaudio_parse_init ( AVCodecParserContext *  s1  )  [static]

Definition at line 579 of file parser.c.

References MpegAudioParseContext::inbuf, MpegAudioParseContext::inbuf_ptr, AVCodecParserContext::priv_data, and s.

static void mpegvideo_extract_headers ( AVCodecParserContext *  s,
AVCodecContext *  avctx,
const uint8_t *  buf,
int  buf_size 
) [static]

Definition at line 322 of file parser.c.

References avcodec_set_dimensions(), AVCodecContext::bit_rate, AVCodecContext::codec_id, CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO, AVRational::den, EXT_START_CODE, find_start_code(), ParseContext1::frame_rate, frame_rate_tab, AVCodecContext::has_b_frames, ParseContext1::height, MPEG1_FRAME_RATE_BASE, AVRational::num, AVCodecParserContext::pict_type, PICTURE_START_CODE, AVCodecParserContext::priv_data, ParseContext1::progressive_sequence, AVCodecParserContext::repeat_pict, SEQ_START_CODE, SLICE_MAX_START_CODE, SLICE_MIN_START_CODE, AVCodecContext::sub_id, AVCodecContext::time_base, top_field_first, and ParseContext1::width.

Referenced by mpegvideo_parse().

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static int mpegvideo_parse ( AVCodecParserContext *  s,
AVCodecContext *  avctx,
uint8_t **  poutbuf,
int *  poutbuf_size,
const uint8_t *  buf,
int  buf_size 
) [static]

Definition at line 424 of file parser.c.

References AVRational::den, ff_combine_frame(), ff_mpeg1_find_frame_end(), mpegvideo_extract_headers(), NULL, AVRational::num, ParseContext1::pc, AVCodecParserContext::pict_type, AVCodecParserContext::priv_data, AVCodecParserContext::repeat_pict, and AVCodecContext::time_base.

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static int mpegvideo_split ( AVCodecContext *  avctx,
const uint8_t *  buf,
int  buf_size 
) [static]

Definition at line 454 of file parser.c.

static void parse1_close ( AVCodecParserContext *  s  )  [static]

Definition at line 475 of file parser.c.

References av_free(), ParseContext::buffer, ParseContext1::enc, ParseContext1::pc, and AVCodecParserContext::priv_data.

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Variable Documentation

AVCodecParser* av_first_parser = NULL

Definition at line 24 of file parser.c.

const int frame_rate_tab[16] [static]

Initial value:

 {
        0,        
    24000,
    24024,
    25025,
    30000,
    30030,
    50050,
    60000,
    60060,
  
    15015,
  
     5005,
    10010,
    12012,
    15015,
  
    25025,
    25025,
}

Definition at line 299 of file parser.c.

AVCodecParser mpeg4video_parser

Initial value:

 {
    { CODEC_ID_MPEG4 },
    sizeof(ParseContext1),
    mpeg4video_parse_init,
    mpeg4video_parse,
    parse1_close,
    mpeg4video_split,
}

Definition at line 838 of file parser.c.

Referenced by avcodec_register_all().

AVCodecParser mpegaudio_parser

Initial value:

 {
    { CODEC_ID_MP2, CODEC_ID_MP3 },
    sizeof(MpegAudioParseContext),
    mpegaudio_parse_init,
    mpegaudio_parse,
    NULL,
}

Definition at line 847 of file parser.c.

Referenced by avcodec_register_all().

AVCodecParser mpegvideo_parser

Initial value:

 {
    { CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO },
    sizeof(ParseContext1),
    NULL,
    mpegvideo_parse,
    parse1_close,
    mpegvideo_split,
}

Definition at line 829 of file parser.c.

Referenced by avcodec_register_all().

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