options.c 3.7 KB

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  1. /*
  2. * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
  3. *
  4. * This file is part of FFmpeg.
  5. *
  6. * FFmpeg is free software; you can redistribute it and/or
  7. * modify it under the terms of the GNU Lesser General Public
  8. * License as published by the Free Software Foundation; either
  9. * version 2.1 of the License, or (at your option) any later version.
  10. *
  11. * FFmpeg is distributed in the hope that it will be useful,
  12. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14. * Lesser General Public License for more details.
  15. *
  16. * You should have received a copy of the GNU Lesser General Public
  17. * License along with FFmpeg; if not, write to the Free Software
  18. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19. */
  20. #include "avformat.h"
  21. #include "libavcodec/opt.h"
  22. /**
  23. * @file libavformat/options.c
  24. * Options definition for AVFormatContext.
  25. */
  26. static const char* format_to_name(void* ptr)
  27. {
  28. AVFormatContext* fc = (AVFormatContext*) ptr;
  29. if(fc->iformat) return fc->iformat->name;
  30. else if(fc->oformat) return fc->oformat->name;
  31. else return "NULL";
  32. }
  33. #define OFFSET(x) offsetof(AVFormatContext,x)
  34. #define DEFAULT 0 //should be NAN but it does not work as it is not a constant in glibc as required by ANSI/ISO C
  35. //these names are too long to be readable
  36. #define E AV_OPT_FLAG_ENCODING_PARAM
  37. #define D AV_OPT_FLAG_DECODING_PARAM
  38. static const AVOption options[]={
  39. {"probesize", NULL, OFFSET(probesize), FF_OPT_TYPE_INT, 32000, 32, INT_MAX, D}, /* 32000 from mpegts.c: 1.0 second at 24Mbit/s */
  40. {"muxrate", "set mux rate", OFFSET(mux_rate), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E},
  41. {"packetsize", "set packet size", OFFSET(packet_size), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E},
  42. {"fflags", NULL, OFFSET(flags), FF_OPT_TYPE_FLAGS, DEFAULT, INT_MIN, INT_MAX, D|E, "fflags"},
  43. {"ignidx", "ignore index", 0, FF_OPT_TYPE_CONST, AVFMT_FLAG_IGNIDX, INT_MIN, INT_MAX, D, "fflags"},
  44. {"genpts", "generate pts", 0, FF_OPT_TYPE_CONST, AVFMT_FLAG_GENPTS, INT_MIN, INT_MAX, D, "fflags"},
  45. #if LIBAVFORMAT_VERSION_INT < (53<<16)
  46. {"track", " set the track number", OFFSET(track), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E},
  47. {"year", "set the year", OFFSET(year), FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX, E},
  48. #endif
  49. {"analyzeduration", "how many microseconds are analyzed to estimate duration", OFFSET(max_analyze_duration), FF_OPT_TYPE_INT, 3*AV_TIME_BASE, 0, INT_MAX, D},
  50. {"cryptokey", "decryption key", OFFSET(key), FF_OPT_TYPE_BINARY, 0, 0, 0, D},
  51. {"indexmem", "max memory used for timestamp index (per stream)", OFFSET(max_index_size), FF_OPT_TYPE_INT, 1<<20, 0, INT_MAX, D},
  52. {"rtbufsize", "max memory used for buffering real-time frames", OFFSET(max_picture_buffer), FF_OPT_TYPE_INT, 3041280, 0, INT_MAX, D}, /* defaults to 1s of 15fps 352x288 YUYV422 video */
  53. {"fdebug", "print specific debug info", OFFSET(debug), FF_OPT_TYPE_FLAGS, DEFAULT, 0, INT_MAX, E|D, "fdebug"},
  54. {"ts", NULL, 0, FF_OPT_TYPE_CONST, FF_FDEBUG_TS, INT_MIN, INT_MAX, E|D, "fdebug"},
  55. {NULL},
  56. };
  57. #undef E
  58. #undef D
  59. #undef DEFAULT
  60. static const AVClass av_format_context_class = { "AVFormatContext", format_to_name, options };
  61. static void avformat_get_context_defaults(AVFormatContext *s)
  62. {
  63. memset(s, 0, sizeof(AVFormatContext));
  64. s->av_class = &av_format_context_class;
  65. av_opt_set_defaults(s);
  66. }
  67. AVFormatContext *avformat_alloc_context(void)
  68. {
  69. AVFormatContext *ic;
  70. ic = av_malloc(sizeof(AVFormatContext));
  71. if (!ic) return ic;
  72. avformat_get_context_defaults(ic);
  73. ic->av_class = &av_format_context_class;
  74. return ic;
  75. }
  76. #if LIBAVFORMAT_VERSION_MAJOR < 53
  77. AVFormatContext *av_alloc_format_context(void)
  78. {
  79. return avformat_alloc_context();
  80. }
  81. #endif