Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 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 | |||
| 22 | #include |
||
| 23 | |||
| 24 | #include "libavutil/internal.h" |
||
| 25 | #include "libavutil/intreadwrite.h" |
||
| 26 | #include "libavutil/pixdesc.h" |
||
| 27 | #include "avcodec.h" |
||
| 28 | #include "internal.h" |
||
| 29 | #include "rle.h" |
||
| 30 | #include "targa.h" |
||
| 31 | |||
| 32 | /** |
||
| 33 | * RLE compress the image, with maximum size of out_size |
||
| 34 | * @param outbuf Output buffer |
||
| 35 | * @param out_size Maximum output size |
||
| 36 | * @param pic Image to compress |
||
| 37 | * @param bpp Bytes per pixel |
||
| 38 | * @param w Image width |
||
| 39 | * @param h Image height |
||
| 40 | * @return Size of output in bytes, or -1 if larger than out_size |
||
| 41 | */ |
||
| 42 | static int targa_encode_rle(uint8_t *outbuf, int out_size, const AVFrame *pic, |
||
| 43 | int bpp, int w, int h) |
||
| 44 | { |
||
| 45 | int y,ret; |
||
| 46 | uint8_t *out; |
||
| 47 | |||
| 48 | out = outbuf; |
||
| 49 | |||
| 50 | for(y = 0; y < h; y ++) { |
||
| 51 | ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0); |
||
| 52 | if(ret == -1){ |
||
| 53 | return -1; |
||
| 54 | } |
||
| 55 | out+= ret; |
||
| 56 | out_size -= ret; |
||
| 57 | } |
||
| 58 | |||
| 59 | return out - outbuf; |
||
| 60 | } |
||
| 61 | |||
| 62 | static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int w, int h) |
||
| 63 | { |
||
| 64 | int i, n = bpp * w; |
||
| 65 | uint8_t *out = outbuf; |
||
| 66 | uint8_t *ptr = pic->data[0]; |
||
| 67 | |||
| 68 | for(i=0; i < h; i++) { |
||
| 69 | memcpy(out, ptr, n); |
||
| 70 | out += n; |
||
| 71 | ptr += pic->linesize[0]; |
||
| 72 | } |
||
| 73 | |||
| 74 | return out - outbuf; |
||
| 75 | } |
||
| 76 | |||
| 77 | static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt, |
||
| 78 | const AVFrame *p, int *got_packet) |
||
| 79 | { |
||
| 80 | int bpp, picsize, datasize = -1, ret, i; |
||
| 81 | uint8_t *out; |
||
| 82 | |||
| 83 | if(avctx->width > 0xffff || avctx->height > 0xffff) { |
||
| 84 | av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n"); |
||
| 85 | return AVERROR(EINVAL); |
||
| 86 | } |
||
| 87 | picsize = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height); |
||
| 88 | if ((ret = ff_alloc_packet2(avctx, pkt, picsize + 45)) < 0) |
||
| 89 | return ret; |
||
| 90 | |||
| 91 | /* zero out the header and only set applicable fields */ |
||
| 92 | memset(pkt->data, 0, 12); |
||
| 93 | AV_WL16(pkt->data+12, avctx->width); |
||
| 94 | AV_WL16(pkt->data+14, avctx->height); |
||
| 95 | /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */ |
||
| 96 | pkt->data[17] = 0x20 | (avctx->pix_fmt == AV_PIX_FMT_BGRA ? 8 : 0); |
||
| 97 | |||
| 98 | out = pkt->data + 18; /* skip past the header we write */ |
||
| 99 | |||
| 100 | avctx->bits_per_coded_sample = av_get_bits_per_pixel(av_pix_fmt_desc_get(avctx->pix_fmt)); |
||
| 101 | switch(avctx->pix_fmt) { |
||
| 102 | case AV_PIX_FMT_PAL8: { |
||
| 103 | int pal_bpp = 24; /* Only write 32bit palette if there is transparency information */ |
||
| 104 | for (i = 0; i < 256; i++) |
||
| 105 | if (AV_RN32(p->data[1] + 4 * i) >> 24 != 0xFF) { |
||
| 106 | pal_bpp = 32; |
||
| 107 | break; |
||
| 108 | } |
||
| 109 | pkt->data[1] = 1; /* palette present */ |
||
| 110 | pkt->data[2] = TGA_PAL; /* uncompressed palettised image */ |
||
| 111 | pkt->data[6] = 1; /* palette contains 256 entries */ |
||
| 112 | pkt->data[7] = pal_bpp; /* palette contains pal_bpp bit entries */ |
||
| 113 | pkt->data[16] = 8; /* bpp */ |
||
| 114 | for (i = 0; i < 256; i++) |
||
| 115 | if (pal_bpp == 32) { |
||
| 116 | AV_WL32(pkt->data + 18 + 4 * i, *(uint32_t *)(p->data[1] + i * 4)); |
||
| 117 | } else { |
||
| 118 | AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4)); |
||
| 119 | } |
||
| 120 | out += 32 * pal_bpp; /* skip past the palette we just output */ |
||
| 121 | break; |
||
| 122 | } |
||
| 123 | case AV_PIX_FMT_GRAY8: |
||
| 124 | pkt->data[2] = TGA_BW; /* uncompressed grayscale image */ |
||
| 125 | avctx->bits_per_coded_sample = 0x28; |
||
| 126 | pkt->data[16] = 8; /* bpp */ |
||
| 127 | break; |
||
| 128 | case AV_PIX_FMT_RGB555LE: |
||
| 129 | pkt->data[2] = TGA_RGB; /* uncompressed true-color image */ |
||
| 130 | avctx->bits_per_coded_sample = |
||
| 131 | pkt->data[16] = 16; /* bpp */ |
||
| 132 | break; |
||
| 133 | case AV_PIX_FMT_BGR24: |
||
| 134 | pkt->data[2] = TGA_RGB; /* uncompressed true-color image */ |
||
| 135 | pkt->data[16] = 24; /* bpp */ |
||
| 136 | break; |
||
| 137 | case AV_PIX_FMT_BGRA: |
||
| 138 | pkt->data[2] = TGA_RGB; /* uncompressed true-color image */ |
||
| 139 | pkt->data[16] = 32; /* bpp */ |
||
| 140 | break; |
||
| 141 | default: |
||
| 142 | av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n", |
||
| 143 | av_get_pix_fmt_name(avctx->pix_fmt)); |
||
| 144 | return AVERROR(EINVAL); |
||
| 145 | } |
||
| 146 | bpp = pkt->data[16] >> 3; |
||
| 147 | |||
| 148 | /* try RLE compression */ |
||
| 149 | if (avctx->coder_type != FF_CODER_TYPE_RAW) |
||
| 150 | datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height); |
||
| 151 | |||
| 152 | /* if that worked well, mark the picture as RLE compressed */ |
||
| 153 | if(datasize >= 0) |
||
| 154 | pkt->data[2] |= TGA_RLE; |
||
| 155 | |||
| 156 | /* if RLE didn't make it smaller, go back to no compression */ |
||
| 157 | else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height); |
||
| 158 | |||
| 159 | out += datasize; |
||
| 160 | |||
| 161 | /* The standard recommends including this section, even if we don't use |
||
| 162 | * any of the features it affords. TODO: take advantage of the pixel |
||
| 163 | * aspect ratio and encoder ID fields available? */ |
||
| 164 | memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26); |
||
| 165 | |||
| 166 | pkt->size = out + 26 - pkt->data; |
||
| 167 | pkt->flags |= AV_PKT_FLAG_KEY; |
||
| 168 | *got_packet = 1; |
||
| 169 | |||
| 170 | return 0; |
||
| 171 | } |
||
| 172 | |||
| 173 | AVCodec ff_targa_encoder = { |
||
| 174 | .name = "targa", |
||
| 175 | .long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"), |
||
| 176 | .type = AVMEDIA_TYPE_VIDEO, |
||
| 177 | .id = AV_CODEC_ID_TARGA, |
||
| 178 | .encode2 = targa_encode_frame, |
||
| 179 | .pix_fmts = (const enum AVPixelFormat[]){ |
||
| 180 | AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8, |
||
| 181 | AV_PIX_FMT_NONE |
||
| 182 | }, |
||
| 183 | }; |