mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-23 11:39:49 +00:00
h261 decoder by (Maarten Daniels <maarten.daniels at student dot luc dot ac dot be>)
Originally committed as revision 3176 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
parent
20646267cd
commit
c6148de232
@ -55,7 +55,7 @@ ASM_OBJS=
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# codecs which are patented in some non free countries like the us
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ifeq ($(CONFIG_RISKY),yes)
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OBJS+= h263.o msmpeg4.o h263dec.o svq1.o rv10.o wmadec.o indeo3.o
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OBJS+= h263.o h261.o msmpeg4.o h263dec.o svq1.o rv10.o wmadec.o indeo3.o
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endif
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ifeq ($(HAVE_XVMC_ACCEL),yes)
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@ -84,6 +84,7 @@ void avcodec_register_all(void)
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#ifdef CONFIG_DECODERS
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#ifdef CONFIG_RISKY
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register_avcodec(&h263_decoder);
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register_avcodec(&h261_decoder);
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register_avcodec(&mpeg4_decoder);
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register_avcodec(&msmpeg4v1_decoder);
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register_avcodec(&msmpeg4v2_decoder);
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@ -213,6 +214,7 @@ PCM_CODEC(CODEC_ID_ADPCM_EA, adpcm_g726);
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/* parsers */
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av_register_codec_parser(&mpegvideo_parser);
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av_register_codec_parser(&mpeg4video_parser);
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av_register_codec_parser(&h261_parser);
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av_register_codec_parser(&h263_parser);
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av_register_codec_parser(&h264_parser);
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@ -34,6 +34,7 @@ enum CodecID {
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CODEC_ID_MPEG1VIDEO,
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CODEC_ID_MPEG2VIDEO, /* prefered ID for MPEG Video 1 or 2 decoding */
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CODEC_ID_MPEG2VIDEO_XVMC,
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CODEC_ID_H261,
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CODEC_ID_H263,
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CODEC_ID_RV10,
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CODEC_ID_RV20,
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@ -1724,6 +1725,7 @@ extern AVCodec zlib_encoder;
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extern AVCodec svq1_encoder;
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extern AVCodec h263_decoder;
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extern AVCodec h261_decoder;
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extern AVCodec mpeg4_decoder;
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extern AVCodec msmpeg4v1_decoder;
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extern AVCodec msmpeg4v2_decoder;
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@ -2124,6 +2126,7 @@ void av_parser_close(AVCodecParserContext *s);
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extern AVCodecParser mpegvideo_parser;
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extern AVCodecParser mpeg4video_parser;
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extern AVCodecParser h261_parser;
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extern AVCodecParser h263_parser;
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extern AVCodecParser h264_parser;
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extern AVCodecParser mpegaudio_parser;
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@ -2360,6 +2360,36 @@ static void h263_h_loop_filter_c(uint8_t *src, int stride, int qscale){
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}
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}
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static void h261_v_loop_filter_c(uint8_t *dest,uint8_t *src, int stride){
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int i,j,xy,yz;
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int res;
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for(i=0; i<8; i++){
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for(j=1; j<7; j++){
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xy = j * stride + i;
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yz = j * 8 + i;
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res = (int)src[yz-1*8] + ((int)(src[yz+0*8]) * 2) + (int)src[yz+1*8];
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res +=2;
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res >>=2;
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dest[xy] = (uint8_t)res;
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}
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}
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}
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static void h261_h_loop_filter_c(uint8_t *dest,uint8_t *src, int stride){
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int i,j,xy,yz;
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int res;
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for(i=1; i<7; i++){
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for(j=0; j<8; j++){
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xy = j * stride + i;
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yz = j * 8 + i;
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res = (int)src[yz-1] + ((int)(src[yz]) *2) + (int)src[yz+1];
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res+=2;
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res>>=2;
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dest[xy] = (uint8_t)res;
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}
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}
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}
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static inline int pix_abs16_c(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
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{
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int s, i;
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@ -3295,6 +3325,9 @@ void dsputil_init(DSPContext* c, AVCodecContext *avctx)
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c->h263_h_loop_filter= h263_h_loop_filter_c;
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c->h263_v_loop_filter= h263_v_loop_filter_c;
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c->h261_h_loop_filter= h261_h_loop_filter_c;
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c->h261_v_loop_filter= h261_v_loop_filter_c;
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c->try_8x8basis= try_8x8basis_c;
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c->add_8x8basis= add_8x8basis_c;
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@ -261,6 +261,9 @@ typedef struct DSPContext {
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void (*h263_v_loop_filter)(uint8_t *src, int stride, int qscale);
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void (*h263_h_loop_filter)(uint8_t *src, int stride, int qscale);
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void (*h261_v_loop_filter)(uint8_t *dest,uint8_t *src, int stride);
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void (*h261_h_loop_filter)(uint8_t *dest,uint8_t *src, int stride);
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/* (I)DCT */
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void (*fdct)(DCTELEM *block/* align 16*/);
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void (*fdct248)(DCTELEM *block/* align 16*/);
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875
libavcodec/h261.c
Normal file
875
libavcodec/h261.c
Normal file
@ -0,0 +1,875 @@
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/*
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* H261 decoder
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2004 Maarten Daniels
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* @file h261.c
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* h261codec.
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*/
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#include "common.h"
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#include "dsputil.h"
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#include "avcodec.h"
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#include "mpegvideo.h"
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#include "h261data.h"
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#define H261_MBA_VLC_BITS 9
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#define H261_MTYPE_VLC_BITS 6
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#define H261_MV_VLC_BITS 7
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#define H261_CBP_VLC_BITS 9
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#define TCOEFF_VLC_BITS 9
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#define MAX_MBA 33
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#define IS_FIL(a) ((a)&MB_TYPE_H261_FIL)
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/**
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* H261Context
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*/
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typedef struct H261Context{
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MpegEncContext s;
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int current_mba;
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int mba_diff;
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int mtype;
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int current_mv_x;
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int current_mv_y;
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int gob_number;
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int loop_filter;
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int bits_left; //8 - nr of bits left of the following frame in the last byte in this frame
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int last_bits; //bits left of the following frame in the last byte in this frame
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}H261Context;
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void ff_h261_loop_filter(H261Context * h){
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MpegEncContext * const s = &h->s;
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int i;
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const int linesize = s->linesize;
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const int uvlinesize= s->uvlinesize;
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uint8_t *dest_y = s->dest[0];
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uint8_t *dest_cb= s->dest[1];
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uint8_t *dest_cr= s->dest[2];
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uint8_t *src;
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CHECKED_ALLOCZ((src),sizeof(uint8_t) * 64 );
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for(i=0; i<8;i++)
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memcpy(src+i*8,dest_y+i*linesize,sizeof(uint8_t) * 8 );
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s->dsp.h261_v_loop_filter(dest_y, src, linesize);
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s->dsp.h261_h_loop_filter(dest_y, src, linesize);
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for(i=0; i<8;i++)
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memcpy(src+i*8,dest_y+i*linesize + 8,sizeof(uint8_t) * 8 );
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s->dsp.h261_v_loop_filter(dest_y + 8, src, linesize);
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s->dsp.h261_h_loop_filter(dest_y + 8, src, linesize);
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for(i=0; i<8;i++)
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memcpy(src+i*8,dest_y+(i+8)*linesize,sizeof(uint8_t) * 8 );
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s->dsp.h261_v_loop_filter(dest_y + 8 * linesize, src, linesize);
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s->dsp.h261_h_loop_filter(dest_y + 8 * linesize, src, linesize);
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for(i=0; i<8;i++)
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memcpy(src+i*8,dest_y+(i+8)*linesize + 8,sizeof(uint8_t) * 8 );
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s->dsp.h261_v_loop_filter(dest_y + 8 * linesize + 8, src, linesize);
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s->dsp.h261_h_loop_filter(dest_y + 8 * linesize + 8, src, linesize);
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for(i=0; i<8;i++)
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memcpy(src+i*8,dest_cb+i*uvlinesize,sizeof(uint8_t) * 8 );
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s->dsp.h261_v_loop_filter(dest_cb, src, uvlinesize);
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s->dsp.h261_h_loop_filter(dest_cb, src, uvlinesize);
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for(i=0; i<8;i++)
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memcpy(src+i*8,dest_cr+i*uvlinesize,sizeof(uint8_t) * 8 );
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s->dsp.h261_v_loop_filter(dest_cr, src, uvlinesize);
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s->dsp.h261_h_loop_filter(dest_cr, src, uvlinesize);
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fail:
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av_free(src);
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return;
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}
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static int h261_decode_block(H261Context *h, DCTELEM *block,
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int n, int coded);
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static int h261_decode_mb(H261Context *h,
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DCTELEM block[6][64]);
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void ff_set_qscale(MpegEncContext * s, int qscale);
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/***********************************************/
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/* decoding */
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static VLC h261_mba_vlc;
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static VLC h261_mtype_vlc;
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static VLC h261_mv_vlc;
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static VLC h261_cbp_vlc;
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void init_vlc_rl(RLTable *rl);
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static void h261_decode_init_vlc(H261Context *h){
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static int done = 0;
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if(!done){
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done = 1;
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init_vlc(&h261_mba_vlc, H261_MBA_VLC_BITS, 34,
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h261_mba_bits, 1, 1,
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h261_mba_code, 1, 1);
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init_vlc(&h261_mtype_vlc, H261_MTYPE_VLC_BITS, 10,
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h261_mtype_bits, 1, 1,
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h261_mtype_code, 1, 1);
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init_vlc(&h261_mv_vlc, H261_MV_VLC_BITS, 17,
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&h261_mv_tab[0][1], 2, 1,
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&h261_mv_tab[0][0], 2, 1);
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init_vlc(&h261_cbp_vlc, H261_CBP_VLC_BITS, 63,
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&h261_cbp_tab[0][1], 2, 1,
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&h261_cbp_tab[0][0], 2, 1);
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init_rl(&h261_rl_tcoeff);
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init_vlc_rl(&h261_rl_tcoeff);
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}
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}
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static int h261_decode_init(AVCodecContext *avctx){
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H261Context *h= avctx->priv_data;
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MpegEncContext * const s = &h->s;
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// set defaults
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MPV_decode_defaults(s);
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s->avctx = avctx;
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s->width = s->avctx->width;
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s->height = s->avctx->height;
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s->codec_id = s->avctx->codec->id;
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s->out_format = FMT_H261;
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s->low_delay= 1;
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avctx->pix_fmt= PIX_FMT_YUV420P;
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s->codec_id= avctx->codec->id;
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h261_decode_init_vlc(h);
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h->bits_left = 0;
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h->last_bits = 0;
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return 0;
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}
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/**
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* decodes the group of blocks header or slice header.
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* @return <0 if an error occured
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*/
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static int h261_decode_gob_header(H261Context *h){
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unsigned int val;
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MpegEncContext * const s = &h->s;
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/* Check for GOB Start Code */
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val = show_bits(&s->gb, 15);
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if(val)
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return -1;
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/* We have a GBSC */
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skip_bits(&s->gb, 16);
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h->gob_number = get_bits(&s->gb, 4); /* GN */
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s->qscale = get_bits(&s->gb, 5); /* GQUANT */
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/* GEI */
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while (get_bits1(&s->gb) != 0) {
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skip_bits(&s->gb, 8);
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}
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if(s->qscale==0)
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return -1;
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// For the first transmitted macroblock in a GOB, MBA is the absolute address. For
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// subsequent macroblocks, MBA is the difference between the absolute addresses of
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// the macroblock and the last transmitted macroblock.
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h->current_mba = 0;
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h->mba_diff = 0;
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return 0;
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}
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/**
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* decodes the group of blocks / video packet header.
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* @return <0 if no resync found
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*/
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static int ff_h261_resync(H261Context *h){
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MpegEncContext * const s = &h->s;
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int left, ret;
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if(show_bits(&s->gb, 15)==0){
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ret= h261_decode_gob_header(h);
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if(ret>=0)
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return 0;
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}
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//ok, its not where its supposed to be ...
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s->gb= s->last_resync_gb;
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align_get_bits(&s->gb);
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left= s->gb.size_in_bits - get_bits_count(&s->gb);
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for(;left>15+1+4+5; left-=8){
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if(show_bits(&s->gb, 15)==0){
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GetBitContext bak= s->gb;
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ret= h261_decode_gob_header(h);
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if(ret>=0)
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return 0;
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s->gb= bak;
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}
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skip_bits(&s->gb, 8);
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}
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return -1;
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}
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/**
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* decodes a skipped macroblock, called when when mba_diff > 1.
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* @return 0
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*/
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static int h261_decode_mb_skipped(H261Context *h,
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DCTELEM block[6][64])
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{
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MpegEncContext * const s = &h->s;
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int i;
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const int xy = s->mb_x + s->mb_y * s->mb_stride;
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s->mb_intra = 0;
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for(i=0;i<6;i++)
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s->block_last_index[i] = -1;
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s->mv_dir = MV_DIR_FORWARD;
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s->mv_type = MV_TYPE_16X16;
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s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
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s->mv[0][0][0] = 0;
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s->mv[0][0][1] = 0;
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s->mb_skiped = 1;
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return 0;
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}
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static int h261_decode_mb(H261Context *h,
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DCTELEM block[6][64])
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{
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MpegEncContext * const s = &h->s;
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int i, cbp, mv_x_diff, mv_y_diff, sign, xy;
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cbp = 63;
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// Read mba
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do{
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h->mba_diff = get_vlc2(&s->gb, h261_mba_vlc.table, H261_MBA_VLC_BITS, 2)+1;
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}
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while( h->mba_diff == MAX_MBA + 1 ); // stuffing
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if ( h->mba_diff < 0 )
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return -1;
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h->current_mba += h->mba_diff;
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if ( h->current_mba > MAX_MBA )
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return -1;
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s->mb_x= ((h->gob_number-1) % 2) * 11 + ((h->current_mba-1) % 11);
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s->mb_y= ((h->gob_number-1) / 2) * 3 + ((h->current_mba-1) / 11);
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xy = s->mb_x + s->mb_y * s->mb_stride;
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ff_init_block_index(s);
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ff_update_block_index(s);
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// Read mtype
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int old_mtype = h->mtype;
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h->mtype = get_vlc2(&s->gb, h261_mtype_vlc.table, H261_MTYPE_VLC_BITS, 2);
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h->mtype = h261_mtype_map[h->mtype];
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if (IS_FIL (h->mtype))
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h->loop_filter = 1;
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// Read mquant
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if ( IS_QUANT ( h->mtype ) ){
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s->qscale = get_bits(&s->gb, 5);
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}
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s->mb_intra = IS_INTRA4x4(h->mtype);
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// Read mv
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if ( IS_16X16 ( h->mtype ) ){
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// Motion vector data is included for all MC macroblocks. MVD is obtained from the macroblock vector by subtracting the
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// vector of the preceding macroblock. For this calculation the vector of the preceding macroblock is regarded as zero in the
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// following three situations:
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// 1) evaluating MVD for macroblocks 1, 12 and 23;
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// 2) evaluating MVD for macroblocks in which MBA does not represent a difference of 1;
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// 3) MTYPE of the previous macroblock was not MC.
|
||||
if ( ( h->current_mba == 1 ) || ( h->current_mba == 12 ) || ( h->current_mba == 23 ) ||
|
||||
( h->mba_diff != 1) || ( !IS_16X16 ( old_mtype ) ))
|
||||
{
|
||||
h->current_mv_x = 0;
|
||||
h->current_mv_y = 0;
|
||||
}
|
||||
|
||||
mv_x_diff = get_vlc2(&s->gb, h261_mv_vlc.table, H261_MV_VLC_BITS, 2);
|
||||
mv_x_diff = mvmap[mv_x_diff];
|
||||
|
||||
if(mv_x_diff != 0){
|
||||
sign = get_bits1(&s->gb);
|
||||
|
||||
if(!sign)
|
||||
mv_x_diff= -mv_x_diff;
|
||||
}
|
||||
|
||||
mv_y_diff = get_vlc2(&s->gb, h261_mv_vlc.table, H261_MV_VLC_BITS, 2);
|
||||
mv_y_diff = mvmap[mv_y_diff];
|
||||
|
||||
if(mv_y_diff != 0){
|
||||
sign = get_bits1(&s->gb);
|
||||
|
||||
if(!sign)
|
||||
mv_y_diff= -mv_y_diff;
|
||||
}
|
||||
|
||||
//mv's are in the range -15...15
|
||||
if((h->current_mv_x + mv_x_diff > -16) && (h->current_mv_x + mv_x_diff < 16) )
|
||||
h->current_mv_x += mv_x_diff;
|
||||
else
|
||||
h->current_mv_x += (mv_x_diff + (mv_x_diff > 0 ? -32 : 32));
|
||||
|
||||
if((h->current_mv_y + mv_y_diff > -16) && (h->current_mv_y + mv_y_diff < 16) )
|
||||
h->current_mv_y += mv_y_diff;
|
||||
else
|
||||
h->current_mv_y += (mv_y_diff + (mv_y_diff>0 ? -32 : 32));
|
||||
}
|
||||
|
||||
// Read cbp
|
||||
if ( HAS_CBP( h->mtype ) ){
|
||||
cbp = get_vlc2(&s->gb, h261_cbp_vlc.table, H261_CBP_VLC_BITS, 2) + 1;
|
||||
}
|
||||
|
||||
if(s->mb_intra){
|
||||
s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
|
||||
goto intra;
|
||||
}
|
||||
|
||||
//set motion vectors
|
||||
s->mv_dir = MV_DIR_FORWARD;
|
||||
s->mv_type = MV_TYPE_16X16;
|
||||
s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
|
||||
if(IS_16X16 ( h->mtype )){
|
||||
s->mv[0][0][0] = h->current_mv_x * 2;//gets divided by 2 in motion compensation
|
||||
s->mv[0][0][1] = h->current_mv_y * 2;
|
||||
}
|
||||
else{
|
||||
h->current_mv_x = s->mv[0][0][0] = 0;
|
||||
h->current_mv_x = s->mv[0][0][1] = 0;
|
||||
}
|
||||
|
||||
intra:
|
||||
/* decode each block */
|
||||
if(s->mb_intra || HAS_CBP(h->mtype)){
|
||||
for (i = 0; i < 6; i++) {
|
||||
if (h261_decode_block(h, block[i], i, cbp&32) < 0){
|
||||
return -1;
|
||||
}
|
||||
cbp+=cbp;
|
||||
}
|
||||
}
|
||||
|
||||
/* per-MB end of slice check */
|
||||
{
|
||||
int v= show_bits(&s->gb, 15);
|
||||
|
||||
if(get_bits_count(&s->gb) + 15 > s->gb.size_in_bits){
|
||||
v>>= get_bits_count(&s->gb) + 15 - s->gb.size_in_bits;
|
||||
}
|
||||
|
||||
if(v==0){
|
||||
return SLICE_END;
|
||||
}
|
||||
}
|
||||
return SLICE_OK;
|
||||
}
|
||||
|
||||
/**
|
||||
* decodes a macroblock
|
||||
* @return <0 if an error occured
|
||||
*/
|
||||
static int h261_decode_block(H261Context * h, DCTELEM * block,
|
||||
int n, int coded)
|
||||
{
|
||||
MpegEncContext * const s = &h->s;
|
||||
int code, level, i, j, run;
|
||||
RLTable *rl = &h261_rl_tcoeff;
|
||||
const uint8_t *scan_table;
|
||||
|
||||
// For the variable length encoding there are two code tables, one being used for
|
||||
// the first transmitted LEVEL in INTER, INTER+MC and INTER+MC+FIL blocks, the second
|
||||
// for all other LEVELs except the first one in INTRA blocks which is fixed length
|
||||
// coded with 8 bits.
|
||||
// NOTE: the two code tables only differ in one VLC so we handle that manually.
|
||||
scan_table = s->intra_scantable.permutated;
|
||||
if (s->mb_intra){
|
||||
/* DC coef */
|
||||
level = get_bits(&s->gb, 8);
|
||||
// 0 (00000000b) and -128 (10000000b) are FORBIDDEN
|
||||
if((level&0x7F) == 0){
|
||||
av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
|
||||
return -1;
|
||||
}
|
||||
// The code 1000 0000 is not used, the reconstruction level of 1024 being coded as 1111 1111.
|
||||
if (level == 255)
|
||||
level = 128;
|
||||
block[0] = level;
|
||||
i = 1;
|
||||
}else if(coded){
|
||||
// Run Level Code
|
||||
// EOB Not possible for first level when cbp is available (that's why the table is different)
|
||||
// 0 1 1s
|
||||
// * * 0*
|
||||
int check = show_bits(&s->gb, 2);
|
||||
i = 0;
|
||||
if ( check & 0x2 ){
|
||||
skip_bits(&s->gb, 2);
|
||||
block[0] = ( check & 0x1 ) ? -1 : 1;
|
||||
i = 1;
|
||||
}
|
||||
}else{
|
||||
i = 0;
|
||||
}
|
||||
if(!coded){
|
||||
s->block_last_index[n] = i - 1;
|
||||
return 0;
|
||||
}
|
||||
for(;;){
|
||||
code = get_vlc2(&s->gb, rl->vlc.table, TCOEFF_VLC_BITS, 2);
|
||||
if (code < 0){
|
||||
av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
|
||||
return -1;
|
||||
}
|
||||
if (code == rl->n) {
|
||||
/* escape */
|
||||
// The remaining combinations of (run, level) are encoded with a 20-bit word consisting of 6 bits escape, 6 bits run and 8 bits level.
|
||||
run = get_bits(&s->gb, 6);
|
||||
level = (int8_t)get_bits(&s->gb, 8);
|
||||
}else if(code == 0){
|
||||
break;
|
||||
}else{
|
||||
run = rl->table_run[code];
|
||||
level = rl->table_level[code];
|
||||
if (get_bits1(&s->gb))
|
||||
level = -level;
|
||||
}
|
||||
i += run;
|
||||
if (i >= 64){
|
||||
av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d\n", s->mb_x, s->mb_y);
|
||||
return -1;
|
||||
}
|
||||
j = scan_table[i];
|
||||
block[j] = level;
|
||||
i++;
|
||||
}
|
||||
s->block_last_index[n] = i;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* decodes the H261 picture header.
|
||||
* @return <0 if no startcode found
|
||||
*/
|
||||
int h261_decode_picture_header(H261Context *h){
|
||||
MpegEncContext * const s = &h->s;
|
||||
int format, i;
|
||||
static int h261_framecounter = 0;
|
||||
uint32_t startcode;
|
||||
align_get_bits(&s->gb);
|
||||
|
||||
startcode = (h->last_bits << (12 - (8-h->bits_left))) | get_bits(&s->gb, 20-8 - (8- h->bits_left));
|
||||
|
||||
for(i= s->gb.size_in_bits - get_bits_count(&s->gb); i>24; i-=1){
|
||||
startcode = ((startcode << 1) | get_bits(&s->gb, 1)) & 0x000FFFFF;
|
||||
|
||||
if(startcode == 0x10)
|
||||
break;
|
||||
}
|
||||
|
||||
if (startcode != 0x10){
|
||||
av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* temporal reference */
|
||||
s->picture_number = get_bits(&s->gb, 5); /* picture timestamp */
|
||||
|
||||
/* PTYPE starts here */
|
||||
skip_bits1(&s->gb); /* split screen off */
|
||||
skip_bits1(&s->gb); /* camera off */
|
||||
skip_bits1(&s->gb); /* freeze picture release off */
|
||||
|
||||
format = get_bits1(&s->gb);
|
||||
|
||||
//only 2 formats possible
|
||||
if (format == 0){//QCIF
|
||||
s->width = 176;
|
||||
s->height = 144;
|
||||
s->mb_width = 11;
|
||||
s->mb_height = 9;
|
||||
}else{//CIF
|
||||
s->width = 352;
|
||||
s->height = 288;
|
||||
s->mb_width = 22;
|
||||
s->mb_height = 18;
|
||||
}
|
||||
|
||||
s->mb_num = s->mb_width * s->mb_height;
|
||||
|
||||
skip_bits1(&s->gb); /* still image mode off */
|
||||
skip_bits1(&s->gb); /* Reserved */
|
||||
|
||||
/* PEI */
|
||||
while (get_bits1(&s->gb) != 0){
|
||||
skip_bits(&s->gb, 8);
|
||||
}
|
||||
|
||||
//h261 has no I-FRAMES, pass the test in MPV_frame_start in mpegvideo.c
|
||||
if(h261_framecounter > 1)
|
||||
s->pict_type = P_TYPE;
|
||||
else
|
||||
s->pict_type = I_TYPE;
|
||||
|
||||
h261_framecounter++;
|
||||
|
||||
h->gob_number = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int h261_decode_gob(H261Context *h){
|
||||
MpegEncContext * const s = &h->s;
|
||||
int i;
|
||||
|
||||
ff_set_qscale(s, s->qscale);
|
||||
while(h->current_mba <= MAX_MBA)
|
||||
{
|
||||
int ret;
|
||||
/* DCT & quantize */
|
||||
s->dsp.clear_blocks(s->block[0]);
|
||||
ret= h261_decode_mb(h, s->block);
|
||||
if(ret<0){
|
||||
const int xy= s->mb_x + s->mb_y*s->mb_stride;
|
||||
if(ret==SLICE_END){
|
||||
MPV_decode_mb(s, s->block);
|
||||
if(h->loop_filter){
|
||||
ff_h261_loop_filter(h);
|
||||
}
|
||||
h->loop_filter = 0;
|
||||
for(i=1; i<h->mba_diff; i++){
|
||||
s->mb_x= ((h->gob_number-1) % 2) * 11 + ((h->current_mba-1-i) % 11);
|
||||
s->mb_y= ((h->gob_number-1) / 2) * 3 + ((h->current_mba-1-i) / 11);
|
||||
ff_init_block_index(s);
|
||||
ff_update_block_index(s);
|
||||
s->dsp.clear_blocks(s->block[0]);
|
||||
ret= h261_decode_mb_skipped(h, s->block);
|
||||
MPV_decode_mb(s, s->block);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}else if(ret==SLICE_NOEND){
|
||||
av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
|
||||
return -1;
|
||||
}
|
||||
av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
|
||||
return -1;
|
||||
}
|
||||
MPV_decode_mb(s, s->block);
|
||||
if(h->loop_filter){
|
||||
ff_h261_loop_filter(h);
|
||||
}
|
||||
|
||||
h->loop_filter = 0;
|
||||
for(i=1; i<h->mba_diff; i++){
|
||||
s->mb_x= ((h->gob_number-1) % 2) * 11 + ((h->current_mba-1-i) % 11);
|
||||
s->mb_y= ((h->gob_number-1) / 2) * 3 + ((h->current_mba-1-i) / 11);
|
||||
ff_init_block_index(s);
|
||||
ff_update_block_index(s);
|
||||
s->dsp.clear_blocks(s->block[0]);
|
||||
ret= h261_decode_mb_skipped(h, s->block);
|
||||
MPV_decode_mb(s, s->block);
|
||||
}
|
||||
}
|
||||
|
||||
return -1;
|
||||
}
|
||||
|
||||
static int h261_find_frame_end(ParseContext *pc, AVCodecContext* avctx, const uint8_t *buf, int buf_size){
|
||||
int vop_found, i, j, bits_left, last_bits;
|
||||
uint32_t state;
|
||||
|
||||
H261Context *h = avctx->priv_data;
|
||||
|
||||
if(h){
|
||||
bits_left = h->bits_left;
|
||||
last_bits = h->last_bits;
|
||||
}
|
||||
else{
|
||||
bits_left = 0;
|
||||
last_bits = 0;
|
||||
}
|
||||
|
||||
vop_found= pc->frame_start_found;
|
||||
state= pc->state;
|
||||
if(bits_left!=0 && !vop_found)
|
||||
state = state << (8-bits_left) | last_bits;
|
||||
i=0;
|
||||
if(!vop_found){
|
||||
for(i=0; i<buf_size; i++){
|
||||
state= (state<<8) | buf[i];
|
||||
for(j=0; j<8; j++){
|
||||
if(( ( (state<<j) | (buf[i]>>(8-j)) )>>(32-20) == 0x10 )&&(((state >> (17-j)) & 0x4000) == 0x0)){
|
||||
i++;
|
||||
vop_found=1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if(vop_found)
|
||||
break;
|
||||
}
|
||||
}
|
||||
if(vop_found){
|
||||
for(; i<buf_size; i++){
|
||||
if(avctx->flags & CODEC_FLAG_TRUNCATED)//XXX ffplay workaround, someone a better solution?
|
||||
state= (state<<8) | buf[i];
|
||||
for(j=0; j<8; j++){
|
||||
if(( ( (state<<j) | (buf[i]>>(8-j)) )>>(32-20) == 0x10 )&&(((state >> (17-j)) & 0x4000) == 0x0)){
|
||||
pc->frame_start_found=0;
|
||||
pc->state=-1;
|
||||
return i-3;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pc->frame_start_found= vop_found;
|
||||
pc->state= state;
|
||||
return END_NOT_FOUND;
|
||||
}
|
||||
|
||||
static int h261_parse(AVCodecParserContext *s,
|
||||
AVCodecContext *avctx,
|
||||
uint8_t **poutbuf, int *poutbuf_size,
|
||||
const uint8_t *buf, int buf_size)
|
||||
{
|
||||
ParseContext *pc = s->priv_data;
|
||||
int next;
|
||||
|
||||
next= h261_find_frame_end(pc,avctx, buf, buf_size);
|
||||
if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {
|
||||
*poutbuf = NULL;
|
||||
*poutbuf_size = 0;
|
||||
return buf_size;
|
||||
}
|
||||
*poutbuf = (uint8_t *)buf;
|
||||
*poutbuf_size = buf_size;
|
||||
return next;
|
||||
}
|
||||
|
||||
/**
|
||||
* returns the number of bytes consumed for building the current frame
|
||||
*/
|
||||
static int get_consumed_bytes(MpegEncContext *s, int buf_size){
|
||||
int pos= (get_bits_count(&s->gb)+7)>>3;
|
||||
|
||||
if(s->flags&CODEC_FLAG_TRUNCATED){
|
||||
pos -= s->parse_context.last_index;
|
||||
if(pos<0) pos=0;// padding is not really read so this might be -1
|
||||
return pos;
|
||||
}else{
|
||||
if(pos==0) pos=1; //avoid infinite loops (i doubt thats needed but ...)
|
||||
if(pos+10>buf_size) pos=buf_size; // oops ;)
|
||||
|
||||
return pos;
|
||||
}
|
||||
}
|
||||
|
||||
static int h261_decode_frame(AVCodecContext *avctx,
|
||||
void *data, int *data_size,
|
||||
uint8_t *buf, int buf_size)
|
||||
{
|
||||
H261Context *h= avctx->priv_data;
|
||||
MpegEncContext *s = &h->s;
|
||||
int ret;
|
||||
AVFrame *pict = data;
|
||||
|
||||
#ifdef PRINT_FRAME_TIME
|
||||
uint64_t time= rdtsc();
|
||||
#endif
|
||||
#ifdef DEBUG
|
||||
printf("*****frame %d size=%d\n", avctx->frame_number, buf_size);
|
||||
printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]);
|
||||
#endif
|
||||
s->flags= avctx->flags;
|
||||
s->flags2= avctx->flags2;
|
||||
|
||||
/* no supplementary picture */
|
||||
if (buf_size == 0) {
|
||||
/* special case for last picture */
|
||||
if (s->low_delay==0 && s->next_picture_ptr) {
|
||||
*pict= *(AVFrame*)s->next_picture_ptr;
|
||||
s->next_picture_ptr= NULL;
|
||||
|
||||
*data_size = sizeof(AVFrame);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
if(s->flags&CODEC_FLAG_TRUNCATED){
|
||||
int next;
|
||||
|
||||
next= h261_find_frame_end(&s->parse_context,avctx, buf, buf_size);
|
||||
|
||||
if( ff_combine_frame(&s->parse_context, next, &buf, &buf_size) < 0 )
|
||||
return buf_size;
|
||||
}
|
||||
|
||||
|
||||
retry:
|
||||
|
||||
if(s->bitstream_buffer_size && buf_size<20){
|
||||
init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
|
||||
}else
|
||||
init_get_bits(&s->gb, buf, buf_size*8);
|
||||
s->bitstream_buffer_size=0;
|
||||
|
||||
if(!s->context_initialized){
|
||||
if (MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
|
||||
return -1;
|
||||
}
|
||||
|
||||
//we need to set current_picture_ptr before reading the header, otherwise we cant store anyting im there
|
||||
if(s->current_picture_ptr==NULL || s->current_picture_ptr->data[0]){
|
||||
int i= ff_find_unused_picture(s, 0);
|
||||
s->current_picture_ptr= &s->picture[i];
|
||||
}
|
||||
|
||||
ret = h261_decode_picture_header(h);
|
||||
|
||||
if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
|
||||
|
||||
/* skip if the header was thrashed */
|
||||
if (ret < 0){
|
||||
av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (s->width != avctx->width || s->height != avctx->height){
|
||||
ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
|
||||
s->parse_context.buffer=0;
|
||||
MPV_common_end(s);
|
||||
s->parse_context= pc;
|
||||
}
|
||||
if (!s->context_initialized) {
|
||||
avctx->width = s->width;
|
||||
avctx->height = s->height;
|
||||
|
||||
goto retry;
|
||||
}
|
||||
|
||||
// for hurry_up==5
|
||||
s->current_picture.pict_type= s->pict_type;
|
||||
s->current_picture.key_frame= s->pict_type == I_TYPE;
|
||||
|
||||
/* skip everything if we are in a hurry>=5 */
|
||||
if(avctx->hurry_up>=5) return get_consumed_bytes(s, buf_size);
|
||||
|
||||
if(MPV_frame_start(s, avctx) < 0)
|
||||
return -1;
|
||||
|
||||
ff_er_frame_start(s);
|
||||
|
||||
/* decode each macroblock */
|
||||
s->mb_x=0;
|
||||
s->mb_y=0;
|
||||
|
||||
while(h->gob_number < (s->mb_height==18 ? 12 : 5)){
|
||||
if(ff_h261_resync(h)<0)
|
||||
break;
|
||||
h261_decode_gob(h);
|
||||
}
|
||||
MPV_frame_end(s);
|
||||
|
||||
// h261 doesn't have byte aligned codes
|
||||
// store the bits of the next frame that are left in the last byte
|
||||
// in the H261Context and remember the number of stored bits
|
||||
{
|
||||
int bitsleft;
|
||||
int current_pos= get_bits_count(&s->gb)>>3;
|
||||
bitsleft = (current_pos<<3) - get_bits_count(&s->gb);
|
||||
h->bits_left = - bitsleft;
|
||||
if(bitsleft > 0)
|
||||
h->last_bits= get_bits(&s->gb, 8 - h->bits_left);
|
||||
else
|
||||
h->last_bits = 0;
|
||||
}
|
||||
|
||||
assert(s->current_picture.pict_type == s->current_picture_ptr->pict_type);
|
||||
assert(s->current_picture.pict_type == s->pict_type);
|
||||
if(s->low_delay){
|
||||
*pict= *(AVFrame*)&s->current_picture;
|
||||
ff_print_debug_info(s, pict);
|
||||
}else{
|
||||
*pict= *(AVFrame*)&s->last_picture;
|
||||
if(pict)
|
||||
ff_print_debug_info(s, pict);
|
||||
}
|
||||
|
||||
/* Return the Picture timestamp as the frame number */
|
||||
/* we substract 1 because it is added on utils.c */
|
||||
avctx->frame_number = s->picture_number - 1;
|
||||
|
||||
/* dont output the last pic after seeking */
|
||||
if(s->last_picture_ptr || s->low_delay)
|
||||
*data_size = sizeof(AVFrame);
|
||||
#ifdef PRINT_FRAME_TIME
|
||||
printf("%Ld\n", rdtsc()-time);
|
||||
#endif
|
||||
|
||||
return get_consumed_bytes(s, buf_size);
|
||||
}
|
||||
|
||||
static int h261_decode_end(AVCodecContext *avctx)
|
||||
{
|
||||
H261Context *h= avctx->priv_data;
|
||||
MpegEncContext *s = &h->s;
|
||||
|
||||
MPV_common_end(s);
|
||||
return 0;
|
||||
}
|
||||
|
||||
AVCodec h261_decoder = {
|
||||
"h261",
|
||||
CODEC_TYPE_VIDEO,
|
||||
CODEC_ID_H261,
|
||||
sizeof(H261Context),
|
||||
h261_decode_init,
|
||||
NULL,
|
||||
h261_decode_end,
|
||||
h261_decode_frame,
|
||||
CODEC_CAP_TRUNCATED,
|
||||
};
|
||||
|
||||
AVCodecParser h261_parser = {
|
||||
{ CODEC_ID_H261 },
|
||||
sizeof(ParseContext),
|
||||
NULL,
|
||||
h261_parse,
|
||||
ff_parse_close,
|
||||
};
|
||||
134
libavcodec/h261data.h
Normal file
134
libavcodec/h261data.h
Normal file
@ -0,0 +1,134 @@
|
||||
/**
|
||||
* @file h261data.h
|
||||
* H.261 tables.
|
||||
*/
|
||||
#define MB_TYPE_H261_FIL 0x800000
|
||||
|
||||
// H.261 VLC table for macroblock addressing
|
||||
const uint8_t h261_mba_code[34] = {
|
||||
1, 3, 2, 3,
|
||||
2, 3, 2, 7,
|
||||
6, 11, 10, 9,
|
||||
8, 7, 6, 23,
|
||||
22, 21, 20, 19,
|
||||
18, 35, 34, 33,
|
||||
32, 31, 30, 29,
|
||||
28, 27, 26, 25,
|
||||
24,
|
||||
15 //(MBA stuffing)
|
||||
};
|
||||
|
||||
const uint8_t h261_mba_bits[34] = {
|
||||
1, 3, 3, 4,
|
||||
4, 5, 5, 7,
|
||||
7, 8, 8, 8,
|
||||
8, 8, 8, 10,
|
||||
10, 10, 10, 10,
|
||||
10, 11, 11, 11,
|
||||
11, 11, 11, 11,
|
||||
11, 11, 11, 11,
|
||||
11,
|
||||
11 //(MBA stuffing)
|
||||
};
|
||||
|
||||
//H.261 VLC table for macroblock type
|
||||
const uint8_t h261_mtype_code[10] = {
|
||||
1, 1, 1, 1,
|
||||
1, 1, 1, 1,
|
||||
1, 1
|
||||
};
|
||||
|
||||
const uint8_t h261_mtype_bits[10] = {
|
||||
4, 7, 1, 5,
|
||||
9, 8, 10, 3,
|
||||
2, 6
|
||||
};
|
||||
|
||||
static const int h261_mtype_map[10]= {
|
||||
MB_TYPE_INTRA4x4,
|
||||
MB_TYPE_INTRA4x4 | MB_TYPE_QUANT,
|
||||
MB_TYPE_CBP,
|
||||
MB_TYPE_QUANT | MB_TYPE_CBP,
|
||||
MB_TYPE_16x16,
|
||||
MB_TYPE_CBP | MB_TYPE_16x16,
|
||||
MB_TYPE_QUANT | MB_TYPE_CBP | MB_TYPE_16x16,
|
||||
MB_TYPE_16x16 | MB_TYPE_H261_FIL,
|
||||
MB_TYPE_CBP | MB_TYPE_16x16 | MB_TYPE_H261_FIL,
|
||||
MB_TYPE_QUANT | MB_TYPE_CBP | MB_TYPE_16x16 | MB_TYPE_H261_FIL
|
||||
};
|
||||
|
||||
//H.261 VLC table for motion vectors
|
||||
const uint8_t h261_mv_tab[17][2] = {
|
||||
{1,1}, {1,2}, {1,3}, {1,4}, {3,6}, {5,7}, {4,7}, {3,7},
|
||||
{11,9}, {10,9}, {9,9}, {17,10}, {16,10}, {15,10}, {14,10}, {13,10}, {12,10}
|
||||
};
|
||||
|
||||
static const int mvmap[17] =
|
||||
{
|
||||
0, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, 16
|
||||
};
|
||||
|
||||
//H.261 VLC table for coded block pattern
|
||||
const uint8_t h261_cbp_tab[63][2] =
|
||||
{
|
||||
{11,5}, {9,5}, {13,6}, {13,4}, {23,7}, {19,7}, {31,8}, {12,4},
|
||||
{22,7}, {18,7}, {30,8}, {19,5}, {27,8}, {23,8}, {19,8}, {11,4},
|
||||
{21,7}, {17,7}, {29,8}, {17,5}, {25,8}, {21,8}, {17,8}, {15,6},
|
||||
{15,8}, {13,8}, {3,9}, {15,5}, {11,8}, {7,8}, {7,9}, {10,4},
|
||||
{20,7}, {16,7}, {28,8}, {14,6}, {14,8}, {12,8}, {2,9}, {16,5},
|
||||
{24,8}, {20,8}, {16,8}, {14,5}, {10,8}, {6,8}, {6,9}, {18,5},
|
||||
{26,8}, {22,8}, {18,8}, {13,5}, {9,8}, {5,8}, {5,9}, {12,5},
|
||||
{8,8}, {4,8}, {4,9}, {7,3}, {10,5}, {8,5}, {12,6}
|
||||
};
|
||||
|
||||
//H.261 VLC table for transform coefficients
|
||||
const uint16_t h261_tcoeff_vlc[65][2] = {
|
||||
{ 0x2, 2 }, { 0x3, 2 },{ 0x4, 4 },{ 0x5, 5 },
|
||||
{ 0x6, 7 },{ 0x26, 8 },{ 0x21, 8 },{ 0xa, 10 },
|
||||
{ 0x1d, 12 },{ 0x18, 12 },{ 0x13, 12 },{ 0x10 , 12 },
|
||||
{ 0x1a, 13},{ 0x19, 13 }, { 0x18, 13 }, { 0x17, 13 },
|
||||
{ 0x3, 3 }, { 0x6, 6 }, { 0x25 , 8 }, { 0xc, 10 },
|
||||
{ 0x1b, 12 }, { 0x16, 13 }, { 0x15, 13 }, { 0x5, 4},
|
||||
{ 0x4, 7}, { 0xb, 10 }, { 0x14, 12 }, { 0x14, 13 },
|
||||
{ 0x7, 5 }, { 0x24, 8 }, { 0x1c, 12 }, { 0x13, 13 },
|
||||
{ 0x6, 5 }, { 0xf, 10 }, { 0x12, 12}, { 0x7, 6},
|
||||
{ 0x9 , 10 }, { 0x12, 13 }, { 0x5, 6 }, { 0x1e, 12 },
|
||||
{ 0x4, 6 }, { 0x15, 12 }, { 0x7, 7 }, { 0x11, 12},
|
||||
{ 0x5, 7 }, { 0x11, 13 }, { 0x27, 8 }, { 0x10, 13 },
|
||||
{ 0x23, 8 }, { 0x22, 8 }, { 0x20, 8 }, { 0xe , 10 },
|
||||
{ 0xd, 10 }, { 0x8, 10 },{ 0x1f, 12 }, { 0x1a, 12 },
|
||||
{ 0x19, 12 }, { 0x17, 12 }, { 0x16, 12}, { 0x1f, 13},
|
||||
{ 0x1e, 13 }, { 0x1d, 13 }, { 0x1c, 13}, { 0x1b, 13},
|
||||
{ 0x1, 6 } //escape
|
||||
};
|
||||
|
||||
const int8_t h261_tcoeff_level[64] = {
|
||||
0, 1, 2, 3, 4, 5, 6, 7,
|
||||
8, 9, 10, 11, 12, 13, 14, 15,
|
||||
1, 2, 3, 4, 5, 6, 7, 1,
|
||||
2, 3, 4, 5, 1, 2, 3, 4,
|
||||
1, 2, 3, 1, 2, 3, 1, 2,
|
||||
1, 2, 1, 2, 1, 2, 1, 2,
|
||||
1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 1, 1, 1, 1, 1
|
||||
};
|
||||
|
||||
const int8_t h261_tcoeff_run[64] = {
|
||||
0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1,
|
||||
1, 1, 1, 1, 1, 1, 2, 2,
|
||||
2, 2, 2, 3, 3, 3, 3, 4,
|
||||
4, 4, 5, 5, 5, 6, 6, 7,
|
||||
7, 8, 8, 9, 9, 10, 10, 11,
|
||||
12, 13, 14, 15, 16, 17, 18, 19,
|
||||
20, 21, 22, 23, 24, 25, 26
|
||||
};
|
||||
|
||||
static RLTable h261_rl_tcoeff = {
|
||||
64,
|
||||
64,
|
||||
h261_tcoeff_vlc,
|
||||
h261_tcoeff_run,
|
||||
h261_tcoeff_level,
|
||||
};
|
||||
@ -53,6 +53,10 @@ static void dct_unquantize_h263_intra_c(MpegEncContext *s,
|
||||
DCTELEM *block, int n, int qscale);
|
||||
static void dct_unquantize_h263_inter_c(MpegEncContext *s,
|
||||
DCTELEM *block, int n, int qscale);
|
||||
static void dct_unquantize_h261_intra_c(MpegEncContext *s,
|
||||
DCTELEM *block, int n, int qscale);
|
||||
static void dct_unquantize_h261_inter_c(MpegEncContext *s,
|
||||
DCTELEM *block, int n, int qscale);
|
||||
static void draw_edges_c(uint8_t *buf, int wrap, int width, int height, int w);
|
||||
#ifdef CONFIG_ENCODERS
|
||||
static int dct_quantize_c(MpegEncContext *s, DCTELEM *block, int n, int qscale, int *overflow);
|
||||
@ -215,6 +219,8 @@ int DCT_common_init(MpegEncContext *s)
|
||||
{
|
||||
s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_c;
|
||||
s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_c;
|
||||
s->dct_unquantize_h261_intra = dct_unquantize_h261_intra_c;
|
||||
s->dct_unquantize_h261_inter = dct_unquantize_h261_inter_c;
|
||||
s->dct_unquantize_mpeg1_intra = dct_unquantize_mpeg1_intra_c;
|
||||
s->dct_unquantize_mpeg1_inter = dct_unquantize_mpeg1_inter_c;
|
||||
s->dct_unquantize_mpeg2_intra = dct_unquantize_mpeg2_intra_c;
|
||||
@ -1454,6 +1460,9 @@ alloc:
|
||||
}else if(s->out_format == FMT_H263){
|
||||
s->dct_unquantize_intra = s->dct_unquantize_h263_intra;
|
||||
s->dct_unquantize_inter = s->dct_unquantize_h263_inter;
|
||||
}else if(s->out_format == FMT_H261){
|
||||
s->dct_unquantize_intra = s->dct_unquantize_h261_intra;
|
||||
s->dct_unquantize_inter = s->dct_unquantize_h261_inter;
|
||||
}else{
|
||||
s->dct_unquantize_intra = s->dct_unquantize_mpeg1_intra;
|
||||
s->dct_unquantize_inter = s->dct_unquantize_mpeg1_inter;
|
||||
@ -2494,6 +2503,12 @@ if(s->quarter_sample)
|
||||
uvsrc_x = src_x>>1;
|
||||
uvsrc_y = src_y>>1;
|
||||
}
|
||||
}else if(s->out_format == FMT_H261){//even chroma mv's are full pel in H261
|
||||
mx = motion_x / 4;
|
||||
my = motion_y / 4;
|
||||
uvdxy = 0;
|
||||
uvsrc_x = s->mb_x*8 + mx;
|
||||
uvsrc_y = s->mb_y*8 + my;
|
||||
} else {
|
||||
mx = motion_x / 2;
|
||||
my = motion_y / 2;
|
||||
@ -5782,6 +5797,59 @@ static void dct_unquantize_h263_inter_c(MpegEncContext *s,
|
||||
}
|
||||
}
|
||||
|
||||
static void dct_unquantize_h261_intra_c(MpegEncContext *s,
|
||||
DCTELEM *block, int n, int qscale)
|
||||
{
|
||||
int i, level, odd;
|
||||
int nCoeffs;
|
||||
|
||||
assert(s->block_last_index[n]>=0);
|
||||
|
||||
if (n < 4)
|
||||
block[0] = block[0] * s->y_dc_scale;
|
||||
else
|
||||
block[0] = block[0] * s->c_dc_scale;
|
||||
odd = qscale & 0x1;
|
||||
nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
|
||||
|
||||
for(i=1; i<=nCoeffs; i++){
|
||||
level = block[i];
|
||||
if (level){
|
||||
if (level < 0){
|
||||
level = qscale * ((level << 1) - 1) + (~odd);
|
||||
}else{
|
||||
level = qscale * ((level << 1) + 1) - (~odd);
|
||||
}
|
||||
}
|
||||
block[i] = level;
|
||||
}
|
||||
}
|
||||
|
||||
static void dct_unquantize_h261_inter_c(MpegEncContext *s,
|
||||
DCTELEM *block, int n, int qscale)
|
||||
{
|
||||
int i, level, odd;
|
||||
int nCoeffs;
|
||||
|
||||
assert(s->block_last_index[n]>=0);
|
||||
|
||||
odd = qscale & 0x1;
|
||||
|
||||
nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
|
||||
|
||||
for(i=0; i<=nCoeffs; i++){
|
||||
level = block[i];
|
||||
if (level){
|
||||
if (level < 0){
|
||||
level = qscale * ((level << 1) - 1) + (~odd);
|
||||
}else{
|
||||
level = qscale * ((level << 1) + 1) - (~odd);
|
||||
}
|
||||
}
|
||||
block[i] = level;
|
||||
}
|
||||
}
|
||||
|
||||
static const AVOption mpeg4_options[] =
|
||||
{
|
||||
AVOPTION_CODEC_INT("bitrate", "desired video bitrate", bit_rate, 4, 240000000, 800000),
|
||||
|
||||
@ -32,6 +32,7 @@
|
||||
|
||||
enum OutputFormat {
|
||||
FMT_MPEG1,
|
||||
FMT_H261,
|
||||
FMT_H263,
|
||||
FMT_MJPEG,
|
||||
FMT_H264,
|
||||
@ -703,6 +704,10 @@ typedef struct MpegEncContext {
|
||||
DCTELEM *block/*align 16*/, int n, int qscale);
|
||||
void (*dct_unquantize_h263_inter)(struct MpegEncContext *s,
|
||||
DCTELEM *block/*align 16*/, int n, int qscale);
|
||||
void (*dct_unquantize_h261_intra)(struct MpegEncContext *s,
|
||||
DCTELEM *block/*align 16*/, int n, int qscale);
|
||||
void (*dct_unquantize_h261_inter)(struct MpegEncContext *s,
|
||||
DCTELEM *block/*align 16*/, int n, int qscale);
|
||||
void (*dct_unquantize_intra)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
|
||||
DCTELEM *block/*align 16*/, int n, int qscale);
|
||||
void (*dct_unquantize_inter)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
|
||||
|
||||
@ -259,6 +259,21 @@ static int h263_probe(AVProbeData *p)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int h261_probe(AVProbeData *p)
|
||||
{
|
||||
int code;
|
||||
const uint8_t *d;
|
||||
|
||||
if (p->buf_size < 6)
|
||||
return 0;
|
||||
d = p->buf;
|
||||
code = (d[0] << 12) | (d[1] << 4) | (d[2] >> 4);
|
||||
if (code == 0x10) {
|
||||
return 50;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
AVInputFormat ac3_iformat = {
|
||||
"ac3",
|
||||
"raw ac3",
|
||||
@ -285,6 +300,18 @@ AVOutputFormat ac3_oformat = {
|
||||
};
|
||||
#endif //CONFIG_ENCODERS
|
||||
|
||||
AVInputFormat h261_iformat = {
|
||||
"h261",
|
||||
"raw h261",
|
||||
0,
|
||||
h261_probe,
|
||||
video_read_header,
|
||||
raw_read_partial_packet,
|
||||
raw_read_close,
|
||||
.extensions = "h261",
|
||||
.value = CODEC_ID_H261,
|
||||
};
|
||||
|
||||
AVInputFormat h263_iformat = {
|
||||
"h263",
|
||||
"raw h263",
|
||||
@ -586,6 +613,8 @@ int raw_init(void)
|
||||
av_register_input_format(&ac3_iformat);
|
||||
av_register_output_format(&ac3_oformat);
|
||||
|
||||
av_register_input_format(&h261_iformat);
|
||||
|
||||
av_register_input_format(&h263_iformat);
|
||||
av_register_output_format(&h263_oformat);
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user