libavcodec/opts.c

   1 /*
   2  * LGPL
   3  */
   4
   5 /**
   6  * @file opts.c
   7  * options parser.
   8  * typical parsed command line:
   9  * msmpeg4:bitrate=720000:qmax=16
  10  *
  11  */
  12
  13 #include "avcodec.h"
  14
  15 #ifdef CONFIG_OS2
  16 #define strcasecmp(s1,s2) stricmp(s1,s2)
  17 #endif
  18
  19 const AVOption avoptions_common[] = {
  20     AVOPTION_CODEC_FLAG("bit_exact", "use only bit-exact stuff", flags, CODEC_FLAG_BITEXACT, 0),
  21     AVOPTION_CODEC_FLAG("mm_force", "force mm flags", dsp_mask, FF_MM_FORCE, 0),
  22 #ifdef HAVE_MMX
  23     AVOPTION_CODEC_FLAG("mm_mmx", "mask MMX feature", dsp_mask, FF_MM_MMX, 0),
  24     AVOPTION_CODEC_FLAG("mm_3dnow", "mask 3DNow feature", dsp_mask, FF_MM_3DNOW, 0),
  25     AVOPTION_CODEC_FLAG("mm_mmxext", "mask MMXEXT (MMX2) feature", dsp_mask, FF_MM_MMXEXT, 0),
  26     AVOPTION_CODEC_FLAG("mm_sse", "mask SSE feature", dsp_mask, FF_MM_SSE, 0),
  27     AVOPTION_CODEC_FLAG("mm_sse2", "mask SSE2 feature", dsp_mask, FF_MM_SSE2, 0),
  28 #endif
  29     AVOPTION_END()
  30 };
  31
  32 const AVOption avoptions_workaround_bug[] = {
  33     AVOPTION_CODEC_FLAG("bug_autodetect", "workaround bug autodetection", workaround_bugs, FF_BUG_AUTODETECT, 1),
  34     AVOPTION_CODEC_FLAG("bug_old_msmpeg4", "workaround old msmpeg4 bug", workaround_bugs, FF_BUG_OLD_MSMPEG4, 0),
  35     AVOPTION_CODEC_FLAG("bug_xvid_ilace", "workaround XviD interlace bug", workaround_bugs, FF_BUG_XVID_ILACE, 0),
  36     AVOPTION_CODEC_FLAG("bug_ump4", "workaround ump4 bug", workaround_bugs, FF_BUG_UMP4, 0),
  37     AVOPTION_CODEC_FLAG("bug_no_padding", "workaround padding bug", workaround_bugs, FF_BUG_NO_PADDING, 0),
  38     AVOPTION_CODEC_FLAG("bug_ac_vlc", "workaround ac VLC bug", workaround_bugs, FF_BUG_AC_VLC, 0),
  39     AVOPTION_CODEC_FLAG("bug_qpel_chroma", "workaround qpel chroma bug", workaround_bugs, FF_BUG_QPEL_CHROMA, 0),
  40     AVOPTION_CODEC_FLAG("bug_std_qpel", "workaround std qpel bug", workaround_bugs, FF_BUG_STD_QPEL, 0),
  41     AVOPTION_CODEC_FLAG("bug_qpel_chroma2", "workaround qpel chroma2 bug", workaround_bugs, FF_BUG_QPEL_CHROMA2, 0),
  42     AVOPTION_CODEC_FLAG("bug_direct_blocksize", "workaround direct blocksize bug", workaround_bugs, FF_BUG_DIRECT_BLOCKSIZE, 0),
  43     AVOPTION_END()
  44 };
  45
  46
  47 static int parse_bool(const AVOption *c, char *s, int *var)
  48 {
  49     int b = 1; /* by default -on- when present */
  50     if (s) {
  51         if (!strcasecmp(s, "off") || !strcasecmp(s, "false")
  52             || !strcmp(s, "0"))
  53             b = 0;
  54         else if (!strcasecmp(s, "on") || !strcasecmp(s, "true")
  55                  || !strcmp(s, "1"))
  56             b = 1;
  57         else
  58             return -1;
  59     }
  60
  61     if (c->type == FF_OPT_TYPE_FLAG) {
  62         if (b)
  63             *var |= (int)c->min;
  64         else
  65             *var &= ~(int)c->min;
  66     } else
  67         *var = b;
  68     return 0;
  69 }
  70
  71 static int parse_double(const AVOption *c, char *s, double *var)
  72 {
  73     double d;
  74     if (!s)
  75         return -1;
  76     d = atof(s);
  77     if (c->min != c->max) {
  78         if (d < c->min || d > c->max) {
  79             fprintf(stderr, "Option: %s double value: %f out of range <%f, %f>\n",
  80                     c->name, d, c->min, c->max);
  81             return -1;
  82         }
  83     }
  84     *var = d;
  85     return 0;
  86 }
  87
  88 static int parse_int(const AVOption* c, char* s, int* var)
  89 {
  90     int i;
  91     if (!s)
  92         return -1;
  93     i = atoi(s);
  94     if (c->min != c->max) {
  95         if (i < (int)c->min || i > (int)c->max) {
  96             fprintf(stderr, "Option: %s integer value: %d out of range <%d, %d>\n",
  97                     c->name, i, (int)c->min, (int)c->max);
  98             return -1;
  99         }
 100     }
 101     *var = i;
 102     return 0;
 103 }
 104
 105 static int parse_string(const AVOption *c, char *s, void* strct, char **var)
 106 {
 107     if (!s)
 108         return -1;
 109
 110     if (c->type == FF_OPT_TYPE_RCOVERRIDE) {
 111         int sf, ef, qs;
 112         float qf;
 113         if (sscanf(s, "%d,%d,%d,%f", &sf, &ef, &qs, &qf) == 4 && sf < ef) {
 114             AVCodecContext *avctx = (AVCodecContext *) strct;
 115             RcOverride *o;
 116             avctx->rc_override = av_realloc(avctx->rc_override,
 117                                             sizeof(RcOverride) * (avctx->rc_override_count + 1));
 118             o = avctx->rc_override + avctx->rc_override_count++;
 119             o->start_frame = sf;
 120             o->end_frame = ef;
 121             o->qscale = qs;
 122             o->quality_factor = qf;
 123
 124             //printf("parsed Rc:  %d,%d,%d,%f  (%d)\n", sf,ef,qs,qf, avctx->rc_override_count);
 125         } else {
 126             printf("incorrect/unparsable Rc: \"%s\"\n", s);
 127         }
 128     } else
 129         *var = av_strdup(s);
 130     return 0;
 131 }
 132
 133 int avoption_parse(void* strct, const AVOption* list, const char *opts)
 134 {
 135     int r = 0;
 136     char* dopts = av_strdup(opts);
 137     if (dopts) {
 138         char *str = dopts;
 139
 140         while (str && *str && r == 0) {
 141             const AVOption *stack[FF_OPT_MAX_DEPTH];
 142             const AVOption *c = list;
 143             int depth = 0;
 144             char* e = strchr(str, ':');
 145             char* p;
 146             if (e)
 147                 *e++ = 0;
 148
 149             p = strchr(str, '=');
 150             if (p)
 151                 *p++ = 0;
 152
 153             // going through option structures
 154             for (;;) {
 155                 if (!c->name) {
 156                     if (c->help) {
 157                         stack[depth++] = c;
 158                         c = (const AVOption*) c->help;
 159                         assert(depth > FF_OPT_MAX_DEPTH);
 160                     } else {
 161                         if (depth == 0)
 162                             break; // finished
 163                         c = stack[--depth];
 164                         c++;
 165                     }
 166                 } else {
 167                     if (!strcmp(c->name, str)) {
 168                         void* ptr = (char*)strct + c->offset;
 169
 170                         switch (c->type & FF_OPT_TYPE_MASK) {
 171                         case FF_OPT_TYPE_BOOL:
 172                             r = parse_bool(c, p, (int*)ptr);
 173                             break;
 174                         case FF_OPT_TYPE_DOUBLE:
 175                             r = parse_double(c, p, (double*)ptr);
 176                             break;
 177                         case FF_OPT_TYPE_INT:
 178                             r = parse_int(c, p, (int*)ptr);
 179                             break;
 180                         case FF_OPT_TYPE_STRING:
 181                             r = parse_string(c, p, strct, (char**)ptr);
 182                             break;
 183                         default:
 184                             assert(0 == 1);
 185                         }
 186                     }
 187                     c++;
 188                 }
 189             }
 190             str = e;
 191         }
 192         av_free(dopts);
 193     }
 194     return r;
 195 }