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move AVCodecParser prototypes and definitions to parser.h, and move mpegvideo parser to mpeg12.c 

Originally committed as revision 6914 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2006-11-06 10:43:49 +00:00
parent 34d3376902
commit 4067d81be2
4 changed files with 232 additions and 211 deletions
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163
libavcodec/mpeg12.c
View File

@ -3312,6 +3312,169 @@ AVCodec mpeg_xvmc_decoder = {
#endif
#ifdef CONFIG_MPEGVIDEO_PARSER
static void mpegvideo_extract_headers(AVCodecParserContext *s,
AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
ParseContext1 *pc = s->priv_data;
const uint8_t *buf_end;
uint32_t start_code;
int frame_rate_index, ext_type, bytes_left;
int frame_rate_ext_n, frame_rate_ext_d;
int picture_structure, top_field_first, repeat_first_field, progressive_frame;
int horiz_size_ext, vert_size_ext, bit_rate_ext;
//FIXME replace the crap with get_bits()
s->repeat_pict = 0;
buf_end = buf + buf_size;
while (buf < buf_end) {
start_code= -1;
buf= ff_find_start_code(buf, buf_end, &start_code);
bytes_left = buf_end - buf;
switch(start_code) {
case PICTURE_START_CODE:
if (bytes_left >= 2) {
s->pict_type = (buf[1] >> 3) & 7;
}
break;
case SEQ_START_CODE:
if (bytes_left >= 7) {
pc->width = (buf[0] << 4) | (buf[1] >> 4);
pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
avcodec_set_dimensions(avctx, pc->width, pc->height);
frame_rate_index = buf[3] & 0xf;
pc->frame_rate.den = avctx->time_base.den = ff_frame_rate_tab[frame_rate_index].num;
pc->frame_rate.num = avctx->time_base.num = ff_frame_rate_tab[frame_rate_index].den;
avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
avctx->codec_id = CODEC_ID_MPEG1VIDEO;
avctx->sub_id = 1;
}
break;
case EXT_START_CODE:
if (bytes_left >= 1) {
ext_type = (buf[0] >> 4);
switch(ext_type) {
case 0x1: /* sequence extension */
if (bytes_left >= 6) {
horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
vert_size_ext = (buf[2] >> 5) & 3;
bit_rate_ext = ((buf[2] & 0x1F)<<7) | (buf[3]>>1);
frame_rate_ext_n = (buf[5] >> 5) & 3;
frame_rate_ext_d = (buf[5] & 0x1f);
pc->progressive_sequence = buf[1] & (1 << 3);
avctx->has_b_frames= !(buf[5] >> 7);
pc->width |=(horiz_size_ext << 12);
pc->height |=( vert_size_ext << 12);
avctx->bit_rate += (bit_rate_ext << 18) * 400;
avcodec_set_dimensions(avctx, pc->width, pc->height);
avctx->time_base.den = pc->frame_rate.den * (frame_rate_ext_n + 1);
avctx->time_base.num = pc->frame_rate.num * (frame_rate_ext_d + 1);
avctx->codec_id = CODEC_ID_MPEG2VIDEO;
avctx->sub_id = 2; /* forces MPEG2 */
}
break;
case 0x8: /* picture coding extension */
if (bytes_left >= 5) {
picture_structure = buf[2]&3;
top_field_first = buf[3] & (1 << 7);
repeat_first_field = buf[3] & (1 << 1);
progressive_frame = buf[4] & (1 << 7);
/* check if we must repeat the frame */
if (repeat_first_field) {
if (pc->progressive_sequence) {
if (top_field_first)
s->repeat_pict = 4;
else
s->repeat_pict = 2;
} else if (progressive_frame) {
s->repeat_pict = 1;
}
}
/* the packet only represents half a frame
XXX,FIXME maybe find a different solution */
if(picture_structure != 3)
s->repeat_pict = -1;
}
break;
}
}
break;
case -1:
goto the_end;
default:
/* we stop parsing when we encounter a slice. It ensures
that this function takes a negligible amount of time */
if (start_code >= SLICE_MIN_START_CODE &&
start_code <= SLICE_MAX_START_CODE)
goto the_end;
break;
}
}
the_end: ;
}
static int mpegvideo_parse(AVCodecParserContext *s,
AVCodecContext *avctx,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
ParseContext1 *pc1 = s->priv_data;
ParseContext *pc= &pc1->pc;
int next;
if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
next= buf_size;
}else{
next= ff_mpeg1_find_frame_end(pc, buf, buf_size);
if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
}
/* we have a full frame : we just parse the first few MPEG headers
to have the full timing information. The time take by this
function should be negligible for uncorrupted streams */
mpegvideo_extract_headers(s, avctx, buf, buf_size);
#if 0
printf("pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
s->pict_type, (double)avctx->time_base.den / avctx->time_base.num, s->repeat_pict);
#endif
*poutbuf = (uint8_t *)buf;
*poutbuf_size = buf_size;
return next;
}
static int mpegvideo_split(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
int i;
uint32_t state= -1;
for(i=0; i<buf_size; i++){
state= (state<<8) | buf[i];
if(state != 0x1B3 && state != 0x1B5 && state < 0x200 && state >= 0x100)
return i-3;
}
return 0;
}
AVCodecParser mpegvideo_parser = {
{ CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO },
sizeof(ParseContext1),
NULL,
mpegvideo_parse,
ff_parse1_close,
mpegvideo_split,
};
#endif /* !CONFIG_MPEGVIDEO_PARSER */
/* this is ugly i know, but the alternative is too make
hundreds of vars global and prefix them with ff_mpeg1_
which is far uglier. */

20
libavcodec/mpegvideo.h
View File

@ -31,6 +31,7 @@
#include "dsputil.h"
#include "bitstream.h"
#include "ratecontrol.h"
#include "parser.h"
#define FRAME_SKIPPED 100 ///< return value for header parsers if frame is not coded
@ -142,17 +143,6 @@ typedef struct Picture{
int b_frame_score; /* */
} Picture;
typedef struct ParseContext{
uint8_t *buffer;
int index;
int last_index;
unsigned int buffer_size;
uint32_t state; ///< contains the last few bytes in MSB order
int frame_start_found;
int overread; ///< the number of bytes which where irreversibly read from the next frame
int overread_index; ///< the index into ParseContext.buffer of the overreaded bytes
} ParseContext;
struct MpegEncContext;
/**
@ -717,9 +707,6 @@ void ff_init_scantable(uint8_t *, ScanTable *st, const uint8_t *src_scantable);
void ff_draw_horiz_band(MpegEncContext *s, int y, int h);
void ff_emulated_edge_mc(uint8_t *buf, uint8_t *src, int linesize, int block_w, int block_h,
int src_x, int src_y, int w, int h);
#define END_NOT_FOUND -100
int ff_combine_frame(ParseContext *pc, int next, uint8_t **buf, int *buf_size);
void ff_parse_close(AVCodecParserContext *s);
void ff_mpeg_flush(AVCodecContext *avctx);
void ff_print_debug_info(MpegEncContext *s, AVFrame *pict);
void ff_write_quant_matrix(PutBitContext *pb, uint16_t *matrix);
@ -789,7 +776,6 @@ void mpeg1_encode_mb(MpegEncContext *s,
void ff_mpeg1_encode_init(MpegEncContext *s);
void ff_mpeg1_encode_slice_header(MpegEncContext *s);
void ff_mpeg1_clean_buffers(MpegEncContext *s);
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size);
/** RLTable. */
@ -896,7 +882,6 @@ void ff_mpeg4_init_direct_mv(MpegEncContext *s);
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
int ff_h263_round_chroma(int x);
void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size);
/* rv10.c */
@ -936,8 +921,5 @@ void mjpeg_picture_header(MpegEncContext *s);
void mjpeg_picture_trailer(MpegEncContext *s);
void ff_mjpeg_stuffing(PutBitContext * pbc);
/* cavs.c */
int ff_cavs_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size);
#endif /* AVCODEC_MPEGVIDEO_H */

196
libavcodec/parser.c
View File

@ -22,6 +22,7 @@
#include "avcodec.h"
#include "mpegvideo.h"
#include "mpegaudio.h"
#include "parser.h"
AVCodecParser *av_first_parser = NULL;
@ -213,27 +214,6 @@ void av_parser_close(AVCodecParserContext *s)
/*****************************************************/
//#define END_NOT_FOUND (-100)
#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
typedef struct ParseContext1{
ParseContext pc;
/* XXX/FIXME PC1 vs. PC */
/* MPEG2 specific */
AVRational frame_rate;
int progressive_sequence;
int width, height;
/* XXX: suppress that, needed by MPEG4 */
MpegEncContext *enc;
int first_picture;
} ParseContext1;
/**
* combines the (truncated) bitstream to a complete frame
* @returns -1 if no complete frame could be created
@ -296,164 +276,6 @@ int ff_combine_frame(ParseContext *pc, int next, uint8_t **buf, int *buf_size)
return 0;
}
#ifdef CONFIG_MPEGVIDEO_PARSER
extern const AVRational ff_frame_rate_tab[];
//FIXME move into mpeg12.c
static void mpegvideo_extract_headers(AVCodecParserContext *s,
AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
ParseContext1 *pc = s->priv_data;
const uint8_t *buf_end;
uint32_t start_code;
int frame_rate_index, ext_type, bytes_left;
int frame_rate_ext_n, frame_rate_ext_d;
int picture_structure, top_field_first, repeat_first_field, progressive_frame;
int horiz_size_ext, vert_size_ext, bit_rate_ext;
//FIXME replace the crap with get_bits()
s->repeat_pict = 0;
buf_end = buf + buf_size;
while (buf < buf_end) {
start_code= -1;
buf= ff_find_start_code(buf, buf_end, &start_code);
bytes_left = buf_end - buf;
switch(start_code) {
case PICTURE_START_CODE:
if (bytes_left >= 2) {
s->pict_type = (buf[1] >> 3) & 7;
}
break;
case SEQ_START_CODE:
if (bytes_left >= 7) {
pc->width = (buf[0] << 4) | (buf[1] >> 4);
pc->height = ((buf[1] & 0x0f) << 8) | buf[2];
avcodec_set_dimensions(avctx, pc->width, pc->height);
frame_rate_index = buf[3] & 0xf;
pc->frame_rate.den = avctx->time_base.den = ff_frame_rate_tab[frame_rate_index].num;
pc->frame_rate.num = avctx->time_base.num = ff_frame_rate_tab[frame_rate_index].den;
avctx->bit_rate = ((buf[4]<<10) | (buf[5]<<2) | (buf[6]>>6))*400;
avctx->codec_id = CODEC_ID_MPEG1VIDEO;
avctx->sub_id = 1;
}
break;
case EXT_START_CODE:
if (bytes_left >= 1) {
ext_type = (buf[0] >> 4);
switch(ext_type) {
case 0x1: /* sequence extension */
if (bytes_left >= 6) {
horiz_size_ext = ((buf[1] & 1) << 1) | (buf[2] >> 7);
vert_size_ext = (buf[2] >> 5) & 3;
bit_rate_ext = ((buf[2] & 0x1F)<<7) | (buf[3]>>1);
frame_rate_ext_n = (buf[5] >> 5) & 3;
frame_rate_ext_d = (buf[5] & 0x1f);
pc->progressive_sequence = buf[1] & (1 << 3);
avctx->has_b_frames= !(buf[5] >> 7);
pc->width |=(horiz_size_ext << 12);
pc->height |=( vert_size_ext << 12);
avctx->bit_rate += (bit_rate_ext << 18) * 400;
avcodec_set_dimensions(avctx, pc->width, pc->height);
avctx->time_base.den = pc->frame_rate.den * (frame_rate_ext_n + 1);
avctx->time_base.num = pc->frame_rate.num * (frame_rate_ext_d + 1);
avctx->codec_id = CODEC_ID_MPEG2VIDEO;
avctx->sub_id = 2; /* forces MPEG2 */
}
break;
case 0x8: /* picture coding extension */
if (bytes_left >= 5) {
picture_structure = buf[2]&3;
top_field_first = buf[3] & (1 << 7);
repeat_first_field = buf[3] & (1 << 1);
progressive_frame = buf[4] & (1 << 7);
/* check if we must repeat the frame */
if (repeat_first_field) {
if (pc->progressive_sequence) {
if (top_field_first)
s->repeat_pict = 4;
else
s->repeat_pict = 2;
} else if (progressive_frame) {
s->repeat_pict = 1;
}
}
/* the packet only represents half a frame
XXX,FIXME maybe find a different solution */
if(picture_structure != 3)
s->repeat_pict = -1;
}
break;
}
}
break;
case -1:
goto the_end;
default:
/* we stop parsing when we encounter a slice. It ensures
that this function takes a negligible amount of time */
if (start_code >= SLICE_MIN_START_CODE &&
start_code <= SLICE_MAX_START_CODE)
goto the_end;
break;
}
}
the_end: ;
}
static int mpegvideo_parse(AVCodecParserContext *s,
AVCodecContext *avctx,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
ParseContext1 *pc1 = s->priv_data;
ParseContext *pc= &pc1->pc;
int next;
if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){
next= buf_size;
}else{
next= ff_mpeg1_find_frame_end(pc, buf, buf_size);
if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
}
/* we have a full frame : we just parse the first few MPEG headers
to have the full timing information. The time take by this
function should be negligible for uncorrupted streams */
mpegvideo_extract_headers(s, avctx, buf, buf_size);
#if 0
printf("pict_type=%d frame_rate=%0.3f repeat_pict=%d\n",
s->pict_type, (double)avctx->time_base.den / avctx->time_base.num, s->repeat_pict);
#endif
*poutbuf = (uint8_t *)buf;
*poutbuf_size = buf_size;
return next;
}
static int mpegvideo_split(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
int i;
uint32_t state= -1;
for(i=0; i<buf_size; i++){
state= (state<<8) | buf[i];
if(state != 0x1B3 && state != 0x1B5 && state < 0x200 && state >= 0x100)
return i-3;
}
return 0;
}
#endif /* CONFIG_MPEGVIDEO_PARSER */
void ff_parse_close(AVCodecParserContext *s)
{
ParseContext *pc = s->priv_data;
@ -461,7 +283,7 @@ void ff_parse_close(AVCodecParserContext *s)
av_free(pc->buffer);
}
static void parse1_close(AVCodecParserContext *s)
void ff_parse1_close(AVCodecParserContext *s)
{
ParseContext1 *pc1 = s->priv_data;
@ -1025,23 +847,13 @@ static int ac3_parse(AVCodecParserContext *s1,
}
#endif /* CONFIG_AC3_PARSER || CONFIG_AAC_PARSER */
#ifdef CONFIG_MPEGVIDEO_PARSER
AVCodecParser mpegvideo_parser = {
{ CODEC_ID_MPEG1VIDEO, CODEC_ID_MPEG2VIDEO },
sizeof(ParseContext1),
NULL,
mpegvideo_parse,
parse1_close,
mpegvideo_split,
};
#endif
#ifdef CONFIG_MPEG4VIDEO_PARSER
AVCodecParser mpeg4video_parser = {
{ CODEC_ID_MPEG4 },
sizeof(ParseContext1),
mpeg4video_parse_init,
mpeg4video_parse,
parse1_close,
ff_parse1_close,
mpeg4video_split,
};
#endif
@ -1051,7 +863,7 @@ AVCodecParser cavsvideo_parser = {
sizeof(ParseContext1),
NULL,
cavsvideo_parse,
parse1_close,
ff_parse1_close,
mpeg4video_split,
};
#endif

64
libavcodec/parser.h Normal file
View File

@ -0,0 +1,64 @@
/*
* AVCodecParser prototypes and definitions
* Copyright (c) 2003 Fabrice Bellard.
* Copyright (c) 2003 Michael Niedermayer.
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef FFMPEG_PARSER_H
#define FFMPEG_PARSER_H
typedef struct ParseContext{
uint8_t *buffer;
int index;
int last_index;
unsigned int buffer_size;
uint32_t state; ///< contains the last few bytes in MSB order
int frame_start_found;
int overread; ///< the number of bytes which where irreversibly read from the next frame
int overread_index; ///< the index into ParseContext.buffer of the overreaded bytes
} ParseContext;
struct MpegEncContext;
typedef struct ParseContext1{
ParseContext pc;
/* XXX/FIXME PC1 vs. PC */
/* MPEG2 specific */
AVRational frame_rate;
int progressive_sequence;
int width, height;
/* XXX: suppress that, needed by MPEG4 */
struct MpegEncContext *enc;
int first_picture;
} ParseContext1;
#define END_NOT_FOUND (-100)
int ff_combine_frame(ParseContext *pc, int next, uint8_t **buf, int *buf_size);
void ff_parse_close(AVCodecParserContext *s);
void ff_parse1_close(AVCodecParserContext *s);
/* h263dec.c */
int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size);
/* cavs.c */
int ff_cavs_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size);
#endif /* !FFMPEG_PARSER_H */