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  1. /*
  2. * Miro VideoXL codec
  3. * Copyright (c) 2004 Konstantin Shishkov
  4. *
  5. * This file is part of Libav.
  6. *
  7. * Libav is free software; you can redistribute it and/or
  8. * modify it under the terms of the GNU Lesser General Public
  9. * License as published by the Free Software Foundation; either
  10. * version 2.1 of the License, or (at your option) any later version.
  11. *
  12. * Libav is distributed in the hope that it will be useful,
  13. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15. * Lesser General Public License for more details.
  16. *
  17. * You should have received a copy of the GNU Lesser General Public
  18. * License along with Libav; if not, write to the Free Software
  19. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20. */
  21. /**
  22. * @file
  23. * Miro VideoXL codec.
  24. */
  25. #include "libavutil/common.h"
  26. #include "libavutil/intreadwrite.h"
  27. #include "avcodec.h"
  28. #include "internal.h"
  29. static const int xl_table[32] = {
  30. 0, 1, 2, 3, 4, 5, 6, 7,
  31. 8, 9, 12, 15, 20, 25, 34, 46,
  32. 64, 82, 94, 103, 108, 113, 116, 119,
  33. 120, 121, 122, 123, 124, 125, 126, 127};
  34. static int decode_frame(AVCodecContext *avctx,
  35. void *data, int *got_frame,
  36. AVPacket *avpkt)
  37. {
  38. const uint8_t *buf = avpkt->data;
  39. int buf_size = avpkt->size;
  40. AVFrame * const p = data;
  41. uint8_t *Y, *U, *V;
  42. int i, j, ret;
  43. int stride;
  44. uint32_t val;
  45. int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0;
  46. if ((ret = ff_get_buffer(avctx, p, 0)) < 0){
  47. av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  48. return ret;
  49. }
  50. p->pict_type= AV_PICTURE_TYPE_I;
  51. p->key_frame= 1;
  52. Y = p->data[0];
  53. U = p->data[1];
  54. V = p->data[2];
  55. stride = avctx->width - 4;
  56. if (buf_size < avctx->width * avctx->height) {
  57. av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
  58. return AVERROR_INVALIDDATA;
  59. }
  60. for (i = 0; i < avctx->height; i++) {
  61. /* lines are stored in reversed order */
  62. buf += stride;
  63. for (j = 0; j < avctx->width; j += 4) {
  64. /* value is stored in LE dword with word swapped */
  65. val = AV_RL32(buf);
  66. buf -= 4;
  67. val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16);
  68. if(!j)
  69. y0 = (val & 0x1F) << 2;
  70. else
  71. y0 = y3 + xl_table[val & 0x1F];
  72. val >>= 5;
  73. y1 = y0 + xl_table[val & 0x1F];
  74. val >>= 5;
  75. y2 = y1 + xl_table[val & 0x1F];
  76. val >>= 6; /* align to word */
  77. y3 = y2 + xl_table[val & 0x1F];
  78. val >>= 5;
  79. if(!j)
  80. c0 = (val & 0x1F) << 2;
  81. else
  82. c0 += xl_table[val & 0x1F];
  83. val >>= 5;
  84. if(!j)
  85. c1 = (val & 0x1F) << 2;
  86. else
  87. c1 += xl_table[val & 0x1F];
  88. Y[j + 0] = y0 << 1;
  89. Y[j + 1] = y1 << 1;
  90. Y[j + 2] = y2 << 1;
  91. Y[j + 3] = y3 << 1;
  92. U[j >> 2] = c0 << 1;
  93. V[j >> 2] = c1 << 1;
  94. }
  95. buf += avctx->width + 4;
  96. Y += p->linesize[0];
  97. U += p->linesize[1];
  98. V += p->linesize[2];
  99. }
  100. *got_frame = 1;
  101. return buf_size;
  102. }
  103. static av_cold int decode_init(AVCodecContext *avctx){
  104. avctx->pix_fmt= AV_PIX_FMT_YUV411P;
  105. return 0;
  106. }
  107. AVCodec ff_xl_decoder = {
  108. .name = "xl",
  109. .type = AVMEDIA_TYPE_VIDEO,
  110. .id = AV_CODEC_ID_VIXL,
  111. .init = decode_init,
  112. .decode = decode_frame,
  113. .capabilities = CODEC_CAP_DR1,
  114. .long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"),
  115. };