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  1. /*
  2. * Targa (.tga) image encoder
  3. * Copyright (c) 2007 Bobby Bingham
  4. *
  5. * This file is part of FFmpeg.
  6. *
  7. * FFmpeg 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. * FFmpeg 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 FFmpeg; if not, write to the Free Software
  19. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20. */
  21. #include "libavutil/intreadwrite.h"
  22. #include "libavutil/pixdesc.h"
  23. #include "avcodec.h"
  24. #include "internal.h"
  25. #include "rle.h"
  26. #include "targa.h"
  27. typedef struct TargaContext {
  28. AVFrame picture;
  29. } TargaContext;
  30. /**
  31. * RLE compress the image, with maximum size of out_size
  32. * @param outbuf Output buffer
  33. * @param out_size Maximum output size
  34. * @param pic Image to compress
  35. * @param bpp Bytes per pixel
  36. * @param w Image width
  37. * @param h Image height
  38. * @return Size of output in bytes, or -1 if larger than out_size
  39. */
  40. static int targa_encode_rle(uint8_t *outbuf, int out_size, const AVFrame *pic,
  41. int bpp, int w, int h)
  42. {
  43. int y,ret;
  44. uint8_t *out;
  45. out = outbuf;
  46. for(y = 0; y < h; y ++) {
  47. ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
  48. if(ret == -1){
  49. return -1;
  50. }
  51. out+= ret;
  52. out_size -= ret;
  53. }
  54. return out - outbuf;
  55. }
  56. static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int w, int h)
  57. {
  58. int i, n = bpp * w;
  59. uint8_t *out = outbuf;
  60. uint8_t *ptr = pic->data[0];
  61. for(i=0; i < h; i++) {
  62. memcpy(out, ptr, n);
  63. out += n;
  64. ptr += pic->linesize[0];
  65. }
  66. return out - outbuf;
  67. }
  68. static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  69. const AVFrame *p, int *got_packet)
  70. {
  71. int bpp, picsize, datasize = -1, ret, i;
  72. uint8_t *out;
  73. if(avctx->width > 0xffff || avctx->height > 0xffff) {
  74. av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
  75. return AVERROR(EINVAL);
  76. }
  77. picsize = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
  78. if ((ret = ff_alloc_packet2(avctx, pkt, picsize + 45)) < 0)
  79. return ret;
  80. /* zero out the header and only set applicable fields */
  81. memset(pkt->data, 0, 12);
  82. AV_WL16(pkt->data+12, avctx->width);
  83. AV_WL16(pkt->data+14, avctx->height);
  84. /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
  85. pkt->data[17] = 0x20 | (avctx->pix_fmt == PIX_FMT_BGRA ? 8 : 0);
  86. out = pkt->data + 18; /* skip past the header we write */
  87. avctx->bits_per_coded_sample = av_get_bits_per_pixel(&av_pix_fmt_descriptors[avctx->pix_fmt]);
  88. switch(avctx->pix_fmt) {
  89. case PIX_FMT_PAL8:
  90. pkt->data[1] = 1; /* palette present */
  91. pkt->data[2] = TGA_PAL; /* uncompressed palettised image */
  92. pkt->data[6] = 1; /* palette contains 256 entries */
  93. pkt->data[7] = 24; /* palette contains 24 bit entries */
  94. pkt->data[16] = 8; /* bpp */
  95. for (i = 0; i < 256; i++)
  96. AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
  97. out += 256 * 3; /* skip past the palette we just output */
  98. break;
  99. case PIX_FMT_GRAY8:
  100. pkt->data[2] = TGA_BW; /* uncompressed grayscale image */
  101. avctx->bits_per_coded_sample = 0x28;
  102. pkt->data[16] = 8; /* bpp */
  103. break;
  104. case PIX_FMT_RGB555LE:
  105. pkt->data[2] = TGA_RGB; /* uncompresses true-color image */
  106. avctx->bits_per_coded_sample =
  107. pkt->data[16] = 16; /* bpp */
  108. break;
  109. case PIX_FMT_BGR24:
  110. pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
  111. pkt->data[16] = 24; /* bpp */
  112. break;
  113. case PIX_FMT_BGRA:
  114. pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
  115. pkt->data[16] = 32; /* bpp */
  116. break;
  117. default:
  118. av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
  119. av_get_pix_fmt_name(avctx->pix_fmt));
  120. return AVERROR(EINVAL);
  121. }
  122. bpp = pkt->data[16] >> 3;
  123. /* try RLE compression */
  124. if (avctx->coder_type != FF_CODER_TYPE_RAW)
  125. datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
  126. /* if that worked well, mark the picture as RLE compressed */
  127. if(datasize >= 0)
  128. pkt->data[2] |= 8;
  129. /* if RLE didn't make it smaller, go back to no compression */
  130. else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
  131. out += datasize;
  132. /* The standard recommends including this section, even if we don't use
  133. * any of the features it affords. TODO: take advantage of the pixel
  134. * aspect ratio and encoder ID fields available? */
  135. memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
  136. pkt->size = out + 26 - pkt->data;
  137. pkt->flags |= AV_PKT_FLAG_KEY;
  138. *got_packet = 1;
  139. return 0;
  140. }
  141. static av_cold int targa_encode_init(AVCodecContext *avctx)
  142. {
  143. TargaContext *s = avctx->priv_data;
  144. avcodec_get_frame_defaults(&s->picture);
  145. s->picture.key_frame= 1;
  146. s->picture.pict_type = AV_PICTURE_TYPE_I;
  147. avctx->coded_frame= &s->picture;
  148. return 0;
  149. }
  150. AVCodec ff_targa_encoder = {
  151. .name = "targa",
  152. .type = AVMEDIA_TYPE_VIDEO,
  153. .id = CODEC_ID_TARGA,
  154. .priv_data_size = sizeof(TargaContext),
  155. .init = targa_encode_init,
  156. .encode2 = targa_encode_frame,
  157. .pix_fmts = (const enum PixelFormat[]){
  158. PIX_FMT_BGR24, PIX_FMT_BGRA, PIX_FMT_RGB555LE, PIX_FMT_GRAY8, PIX_FMT_PAL8,
  159. PIX_FMT_NONE
  160. },
  161. .long_name= NULL_IF_CONFIG_SMALL("Truevision Targa image"),
  162. };