conform.c
资源名称:mpeg2.rar [点击查看]
上传用户:ma_junhua
上传日期:2008-04-11
资源大小:2752k
文件大小:9k
源码类别:
其他嵌入式/单片机内容
开发平台:
C/C++
- /* conform.c, conformance checks */
- /* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. */
- /*
- * Disclaimer of Warranty
- *
- * These software programs are available to the user without any license fee or
- * royalty on an "as is" basis. The MPEG Software Simulation Group disclaims
- * any and all warranties, whether express, implied, or statuary, including any
- * implied warranties or merchantability or of fitness for a particular
- * purpose. In no event shall the copyright-holder be liable for any
- * incidental, punitive, or consequential damages of any kind whatsoever
- * arising from the use of these programs.
- *
- * This disclaimer of warranty extends to the user of these programs and user's
- * customers, employees, agents, transferees, successors, and assigns.
- *
- * The MPEG Software Simulation Group does not represent or warrant that the
- * programs furnished hereunder are free of infringement of any third-party
- * patents.
- *
- * Commercial implementations of MPEG-1 and MPEG-2 video, including shareware,
- * are subject to royalty fees to patent holders. Many of these patents are
- * general enough such that they are unavoidable regardless of implementation
- * design.
- *
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include "config.h"
- #include "global.h"
- /* check for (level independent) parameter limits */
- void range_checks()
- {
- int i;
- /* range and value checks */
- if (horizontal_size<1 || horizontal_size>16383)
- error("horizontal_size must be between 1 and 16383");
- if (mpeg1 && horizontal_size>4095)
- error("horizontal_size must be less than 4096 (MPEG-1)");
- if ((horizontal_size&4095)==0)
- error("horizontal_size must not be a multiple of 4096");
- if (chroma_format!=CHROMA444 && horizontal_size%2 != 0)
- error("horizontal_size must be a even (4:2:0 / 4:2:2)");
- if (vertical_size<1 || vertical_size>16383)
- error("vertical_size must be between 1 and 16383");
- if (mpeg1 && vertical_size>4095)
- error("vertical size must be less than 4096 (MPEG-1)");
- if ((vertical_size&4095)==0)
- error("vertical_size must not be a multiple of 4096");
- if (chroma_format==CHROMA420 && vertical_size%2 != 0)
- error("vertical_size must be a even (4:2:0)");
- if(fieldpic)
- {
- if (vertical_size%2 != 0)
- error("vertical_size must be a even (field pictures)");
- if (chroma_format==CHROMA420 && vertical_size%4 != 0)
- error("vertical_size must be a multiple of 4 (4:2:0 field pictures)");
- }
- if (mpeg1)
- {
- if (aspectratio<1 || aspectratio>14)
- error("pel_aspect_ratio must be between 1 and 14 (MPEG-1)");
- }
- else
- {
- if (aspectratio<1 || aspectratio>4)
- error("aspect_ratio_information must be 1, 2, 3 or 4");
- }
- if (frame_rate_code<1 || frame_rate_code>8)
- error("frame_rate code must be between 1 and 8");
- if (bit_rate<=0.0)
- error("bit_rate must be positive");
- if (bit_rate > ((1<<30)-1)*400.0)
- error("bit_rate must be less than 429 Gbit/s");
- if (mpeg1 && bit_rate > ((1<<18)-1)*400.0)
- error("bit_rate must be less than 104 Mbit/s (MPEG-1)");
- if (vbv_buffer_size<1 || vbv_buffer_size>0x3ffff)
- error("vbv_buffer_size must be in range 1..(2^18-1)");
- if (mpeg1 && vbv_buffer_size>=1024)
- error("vbv_buffer_size must be less than 1024 (MPEG-1)");
- if (chroma_format<CHROMA420 || chroma_format>CHROMA444)
- error("chroma_format must be in range 1...3");
- if (video_format<0 || video_format>4)
- error("video_format must be in range 0...4");
- if (color_primaries<1 || color_primaries>7 || color_primaries==3)
- error("color_primaries must be in range 1...2 or 4...7");
- if (transfer_characteristics<1 || transfer_characteristics>7
- || transfer_characteristics==3)
- error("transfer_characteristics must be in range 1...2 or 4...7");
- if (matrix_coefficients<1 || matrix_coefficients>7 || matrix_coefficients==3)
- error("matrix_coefficients must be in range 1...2 or 4...7");
- if (display_horizontal_size<0 || display_horizontal_size>16383)
- error("display_horizontal_size must be in range 0...16383");
- if (display_vertical_size<0 || display_vertical_size>16383)
- error("display_vertical_size must be in range 0...16383");
- if (dc_prec<0 || dc_prec>3)
- error("intra_dc_precision must be in range 0...3");
- for (i=0; i<M; i++)
- {
- if (motion_data[i].forw_hor_f_code<1 || motion_data[i].forw_hor_f_code>9)
- error("f_code must be between 1 and 9");
- if (motion_data[i].forw_vert_f_code<1 || motion_data[i].forw_vert_f_code>9)
- error("f_code must be between 1 and 9");
- if (mpeg1 && motion_data[i].forw_hor_f_code>7)
- error("f_code must be le less than 8");
- if (mpeg1 && motion_data[i].forw_vert_f_code>7)
- error("f_code must be le less than 8");
- if (motion_data[i].sxf<=0)
- error("search window must be positive"); /* doesn't belong here */
- if (motion_data[i].syf<=0)
- error("search window must be positive");
- if (i!=0)
- {
- if (motion_data[i].back_hor_f_code<1 || motion_data[i].back_hor_f_code>9)
- error("f_code must be between 1 and 9");
- if (motion_data[i].back_vert_f_code<1 || motion_data[i].back_vert_f_code>9)
- error("f_code must be between 1 and 9");
- if (mpeg1 && motion_data[i].back_hor_f_code>7)
- error("f_code must be le less than 8");
- if (mpeg1 && motion_data[i].back_vert_f_code>7)
- error("f_code must be le less than 8");
- if (motion_data[i].sxb<=0)
- error("search window must be positive");
- if (motion_data[i].syb<=0)
- error("search window must be positive");
- }
- }
- }
- /* identifies valid profile / level combinations */
- static char profile_level_defined[5][4] =
- {
- /* HL H-14 ML LL */
- {1, 1, 1, 0}, /* HP */
- {0, 1, 0, 0}, /* Spat */
- {0, 0, 1, 1}, /* SNR */
- {1, 1, 1, 1}, /* MP */
- {0, 0, 1, 0} /* SP */
- };
- static struct level_limits {
- int hor_f_code;
- int vert_f_code;
- int hor_size;
- int vert_size;
- int sample_rate;
- int bit_rate; /* Mbit/s */
- int vbv_buffer_size; /* 16384 bit steps */
- } maxval_tab[4] =
- {
- {9, 5, 1920, 1152, 62668800, 80, 597}, /* HL */
- {9, 5, 1440, 1152, 47001600, 60, 448}, /* H-14 */
- {8, 5, 720, 576, 10368000, 15, 112}, /* ML */
- {7, 4, 352, 288, 3041280, 4, 29} /* LL */
- };
- #define SP 5
- #define MP 4
- #define SNR 3
- #define SPAT 2
- #define HP 1
- #define LL 10
- #define ML 8
- #define H14 6
- #define HL 4
- void profile_and_level_checks()
- {
- int i;
- struct level_limits *maxval;
- if (profile<0 || profile>15)
- error("profile must be between 0 and 15");
- if (level<0 || level>15)
- error("level must be between 0 and 15");
- if (profile>=8)
- {
- if (!quiet)
- fprintf(stderr,"Warning: profile uses a reserved value, conformance checks skippedn");
- return;
- }
- if (profile<HP || profile>SP)
- error("undefined Profile");
- if (profile==SNR || profile==SPAT)
- error("This encoder currently generates no scalable bitstreams");
- if (level<HL || level>LL || level&1)
- error("undefined Level");
- maxval = &maxval_tab[(level-4) >> 1];
- /* check profile@level combination */
- if(!profile_level_defined[profile-1][(level-4) >> 1])
- error("undefined profile@level combination");
- /* profile (syntax) constraints */
- if (profile==SP && M!=1)
- error("Simple Profile does not allow B pictures");
- if (profile!=HP && chroma_format!=CHROMA420)
- error("chroma format must be 4:2:0 in specified Profile");
- if (profile==HP && chroma_format==CHROMA444)
- error("chroma format must be 4:2:0 or 4:2:2 in High Profile");
- if (profile>=MP) /* SP, MP: constrained repeat_first_field */
- {
- if (frame_rate_code<=2 && repeatfirst)
- error("repeat_first_first must be zero");
- if (frame_rate_code<=6 && prog_seq && repeatfirst)
- error("repeat_first_first must be zero");
- }
- if (profile!=HP && dc_prec==3)
- error("11 bit DC precision only allowed in High Profile");
- /* level (parameter value) constraints */
- /* Table 8-8 */
- if (frame_rate_code>5 && level>=ML)
- error("Picture rate greater than permitted in specified Level");
- for (i=0; i<M; i++)
- {
- if (motion_data[i].forw_hor_f_code > maxval->hor_f_code)
- error("forward horizontal f_code greater than permitted in specified Level");
- if (motion_data[i].forw_vert_f_code > maxval->vert_f_code)
- error("forward vertical f_code greater than permitted in specified Level");
- if (i!=0)
- {
- if (motion_data[i].back_hor_f_code > maxval->hor_f_code)
- error("backward horizontal f_code greater than permitted in specified Level");
- if (motion_data[i].back_vert_f_code > maxval->vert_f_code)
- error("backward vertical f_code greater than permitted in specified Level");
- }
- }
- /* Table 8-10 */
- if (horizontal_size > maxval->hor_size)
- error("Horizontal size is greater than permitted in specified Level");
- if (vertical_size > maxval->vert_size)
- error("Horizontal size is greater than permitted in specified Level");
- /* Table 8-11 */
- if (horizontal_size*vertical_size*frame_rate > maxval->sample_rate)
- error("Sample rate is greater than permitted in specified Level");
- /* Table 8-12 */
- if (bit_rate> 1.0e6 * maxval->bit_rate)
- error("Bit rate is greater than permitted in specified Level");
- /* Table 8-13 */
- if (vbv_buffer_size > maxval->vbv_buffer_size)
- error("vbv_buffer_size exceeds High Level limit");
- }