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  1. /*
  2. * Quicktime Planar RGB (8BPS) Video Decoder
  3. * Copyright (C) 2003 Roberto Togni
  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. * QT 8BPS Video Decoder by Roberto Togni
  24. * For more information about the 8BPS format, visit:
  25. * http://www.pcisys.net/~melanson/codecs/
  26. *
  27. * Supports: PAL8 (RGB 8bpp, paletted)
  28. * : BGR24 (RGB 24bpp) (can also output it as RGB32)
  29. * : RGB32 (RGB 32bpp, 4th plane is probably alpha and it's ignored)
  30. *
  31. */
  32. #include <stdio.h>
  33. #include <stdlib.h>
  34. #include <string.h>
  35. #include "libavutil/internal.h"
  36. #include "libavutil/intreadwrite.h"
  37. #include "avcodec.h"
  38. #include "internal.h"
  39. static const enum AVPixelFormat pixfmt_rgb24[] = {
  40. AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE };
  41. typedef struct EightBpsContext {
  42. AVCodecContext *avctx;
  43. AVFrame pic;
  44. unsigned char planes;
  45. unsigned char planemap[4];
  46. uint32_t pal[256];
  47. } EightBpsContext;
  48. static int decode_frame(AVCodecContext *avctx, void *data,
  49. int *got_frame, AVPacket *avpkt)
  50. {
  51. const uint8_t *buf = avpkt->data;
  52. int buf_size = avpkt->size;
  53. EightBpsContext * const c = avctx->priv_data;
  54. const unsigned char *encoded = buf;
  55. unsigned char *pixptr, *pixptr_end;
  56. unsigned int height = avctx->height; // Real image height
  57. unsigned int dlen, p, row;
  58. const unsigned char *lp, *dp;
  59. unsigned char count;
  60. unsigned int px_inc;
  61. unsigned int planes = c->planes;
  62. unsigned char *planemap = c->planemap;
  63. int ret;
  64. if (c->pic.data[0])
  65. avctx->release_buffer(avctx, &c->pic);
  66. c->pic.reference = 0;
  67. c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
  68. if ((ret = ff_get_buffer(avctx, &c->pic)) < 0) {
  69. av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  70. return ret;
  71. }
  72. /* Set data pointer after line lengths */
  73. dp = encoded + planes * (height << 1);
  74. /* Ignore alpha plane, don't know what to do with it */
  75. if (planes == 4)
  76. planes--;
  77. px_inc = planes + (avctx->pix_fmt == AV_PIX_FMT_RGB32);
  78. for (p = 0; p < planes; p++) {
  79. /* Lines length pointer for this plane */
  80. lp = encoded + p * (height << 1);
  81. /* Decode a plane */
  82. for (row = 0; row < height; row++) {
  83. pixptr = c->pic.data[0] + row * c->pic.linesize[0] + planemap[p];
  84. pixptr_end = pixptr + c->pic.linesize[0];
  85. dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2));
  86. /* Decode a row of this plane */
  87. while (dlen > 0) {
  88. if (dp + 1 >= buf + buf_size)
  89. return AVERROR_INVALIDDATA;
  90. if ((count = *dp++) <= 127) {
  91. count++;
  92. dlen -= count + 1;
  93. if (pixptr + count * px_inc > pixptr_end)
  94. break;
  95. if (dp + count > buf + buf_size)
  96. return AVERROR_INVALIDDATA;
  97. while (count--) {
  98. *pixptr = *dp++;
  99. pixptr += px_inc;
  100. }
  101. } else {
  102. count = 257 - count;
  103. if (pixptr + count * px_inc > pixptr_end)
  104. break;
  105. while (count--) {
  106. *pixptr = *dp;
  107. pixptr += px_inc;
  108. }
  109. dp++;
  110. dlen -= 2;
  111. }
  112. }
  113. }
  114. }
  115. if (avctx->bits_per_coded_sample <= 8) {
  116. const uint8_t *pal = av_packet_get_side_data(avpkt,
  117. AV_PKT_DATA_PALETTE,
  118. NULL);
  119. if (pal) {
  120. c->pic.palette_has_changed = 1;
  121. memcpy(c->pal, pal, AVPALETTE_SIZE);
  122. }
  123. memcpy (c->pic.data[1], c->pal, AVPALETTE_SIZE);
  124. }
  125. *got_frame = 1;
  126. *(AVFrame*)data = c->pic;
  127. /* always report that the buffer was completely consumed */
  128. return buf_size;
  129. }
  130. static av_cold int decode_init(AVCodecContext *avctx)
  131. {
  132. EightBpsContext * const c = avctx->priv_data;
  133. c->avctx = avctx;
  134. c->pic.data[0] = NULL;
  135. switch (avctx->bits_per_coded_sample) {
  136. case 8:
  137. avctx->pix_fmt = AV_PIX_FMT_PAL8;
  138. c->planes = 1;
  139. c->planemap[0] = 0; // 1st plane is palette indexes
  140. break;
  141. case 24:
  142. avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24);
  143. c->planes = 3;
  144. c->planemap[0] = 2; // 1st plane is red
  145. c->planemap[1] = 1; // 2nd plane is green
  146. c->planemap[2] = 0; // 3rd plane is blue
  147. break;
  148. case 32:
  149. avctx->pix_fmt = AV_PIX_FMT_RGB32;
  150. c->planes = 4;
  151. #if HAVE_BIGENDIAN
  152. c->planemap[0] = 1; // 1st plane is red
  153. c->planemap[1] = 2; // 2nd plane is green
  154. c->planemap[2] = 3; // 3rd plane is blue
  155. c->planemap[3] = 0; // 4th plane is alpha???
  156. #else
  157. c->planemap[0] = 2; // 1st plane is red
  158. c->planemap[1] = 1; // 2nd plane is green
  159. c->planemap[2] = 0; // 3rd plane is blue
  160. c->planemap[3] = 3; // 4th plane is alpha???
  161. #endif
  162. break;
  163. default:
  164. av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n",
  165. avctx->bits_per_coded_sample);
  166. return AVERROR_INVALIDDATA;
  167. }
  168. return 0;
  169. }
  170. static av_cold int decode_end(AVCodecContext *avctx)
  171. {
  172. EightBpsContext * const c = avctx->priv_data;
  173. if (c->pic.data[0])
  174. avctx->release_buffer(avctx, &c->pic);
  175. return 0;
  176. }
  177. AVCodec ff_eightbps_decoder = {
  178. .name = "8bps",
  179. .type = AVMEDIA_TYPE_VIDEO,
  180. .id = AV_CODEC_ID_8BPS,
  181. .priv_data_size = sizeof(EightBpsContext),
  182. .init = decode_init,
  183. .close = decode_end,
  184. .decode = decode_frame,
  185. .capabilities = CODEC_CAP_DR1,
  186. .long_name = NULL_IF_CONFIG_SMALL("QuickTime 8BPS video"),
  187. };