mjpegdec.h 3.8 KB

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  1. /*
  2. * MJPEG decoder
  3. * Copyright (c) 2000, 2001 Fabrice Bellard
  4. * Copyright (c) 2003 Alex Beregszaszi
  5. * Copyright (c) 2003-2004 Michael Niedermayer
  6. *
  7. * This file is part of FFmpeg.
  8. *
  9. * FFmpeg is free software; you can redistribute it and/or
  10. * modify it under the terms of the GNU Lesser General Public
  11. * License as published by the Free Software Foundation; either
  12. * version 2.1 of the License, or (at your option) any later version.
  13. *
  14. * FFmpeg is distributed in the hope that it will be useful,
  15. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17. * Lesser General Public License for more details.
  18. *
  19. * You should have received a copy of the GNU Lesser General Public
  20. * License along with FFmpeg; if not, write to the Free Software
  21. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22. */
  23. /**
  24. * @file libavcodec/mjpegdec.h
  25. * MJPEG decoder.
  26. */
  27. #ifndef AVCODEC_MJPEGDEC_H
  28. #define AVCODEC_MJPEGDEC_H
  29. #include "avcodec.h"
  30. #include "bitstream.h"
  31. #include "dsputil.h"
  32. #define MAX_COMPONENTS 4
  33. typedef struct MJpegDecodeContext {
  34. AVCodecContext *avctx;
  35. GetBitContext gb;
  36. int start_code; /* current start code */
  37. int buffer_size;
  38. uint8_t *buffer;
  39. int16_t quant_matrixes[4][64];
  40. VLC vlcs[2][4];
  41. int qscale[4]; ///< quantizer scale calculated from quant_matrixes
  42. int org_height; /* size given at codec init */
  43. int first_picture; /* true if decoding first picture */
  44. int interlaced; /* true if interlaced */
  45. int bottom_field; /* true if bottom field */
  46. int lossless;
  47. int ls;
  48. int progressive;
  49. int rgb;
  50. int rct; /* standard rct */
  51. int pegasus_rct; /* pegasus reversible colorspace transform */
  52. int bits; /* bits per component */
  53. int maxval;
  54. int near; ///< near lossless bound (si 0 for lossless)
  55. int t1,t2,t3;
  56. int reset; ///< context halfing intervall ?rename
  57. int width, height;
  58. int mb_width, mb_height;
  59. int nb_components;
  60. int block_stride[MAX_COMPONENTS];
  61. int component_id[MAX_COMPONENTS];
  62. int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
  63. int v_count[MAX_COMPONENTS];
  64. int comp_index[MAX_COMPONENTS];
  65. int dc_index[MAX_COMPONENTS];
  66. int ac_index[MAX_COMPONENTS];
  67. int nb_blocks[MAX_COMPONENTS];
  68. int h_scount[MAX_COMPONENTS];
  69. int v_scount[MAX_COMPONENTS];
  70. int h_max, v_max; /* maximum h and v counts */
  71. int quant_index[4]; /* quant table index for each component */
  72. int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
  73. AVFrame picture; /* picture structure */
  74. int linesize[MAX_COMPONENTS]; ///< linesize << interlaced
  75. int8_t *qscale_table;
  76. DECLARE_ALIGNED_16(DCTELEM, block[64]);
  77. DCTELEM (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode)
  78. uint8_t *last_nnz[MAX_COMPONENTS];
  79. uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
  80. ScanTable scantable;
  81. DSPContext dsp;
  82. int restart_interval;
  83. int restart_count;
  84. int buggy_avid;
  85. int cs_itu601;
  86. int interlace_polarity;
  87. int mjpb_skiptosod;
  88. int cur_scan; /* current scan, used by JPEG-LS */
  89. } MJpegDecodeContext;
  90. int ff_mjpeg_decode_init(AVCodecContext *avctx);
  91. int ff_mjpeg_decode_end(AVCodecContext *avctx);
  92. int ff_mjpeg_decode_frame(AVCodecContext *avctx,
  93. void *data, int *data_size,
  94. const uint8_t *buf, int buf_size);
  95. int ff_mjpeg_decode_dqt(MJpegDecodeContext *s);
  96. int ff_mjpeg_decode_dht(MJpegDecodeContext *s);
  97. int ff_mjpeg_decode_sof(MJpegDecodeContext *s);
  98. int ff_mjpeg_decode_sos(MJpegDecodeContext *s);
  99. #endif /* AVCODEC_MJPEGDEC_H */