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Diffstat (limited to 'ffmpeg/libavcodec/targaenc.c')
-rw-r--r--ffmpeg/libavcodec/targaenc.c201
1 files changed, 201 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/targaenc.c b/ffmpeg/libavcodec/targaenc.c
new file mode 100644
index 0000000..b2c679d
--- /dev/null
+++ b/ffmpeg/libavcodec/targaenc.c
@@ -0,0 +1,201 @@
+/*
+ * Targa (.tga) image encoder
+ * Copyright (c) 2007 Bobby Bingham
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <string.h>
+
+#include "libavutil/internal.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/pixdesc.h"
+#include "avcodec.h"
+#include "internal.h"
+#include "rle.h"
+#include "targa.h"
+
+typedef struct TargaContext {
+ AVFrame picture;
+} TargaContext;
+
+/**
+ * RLE compress the image, with maximum size of out_size
+ * @param outbuf Output buffer
+ * @param out_size Maximum output size
+ * @param pic Image to compress
+ * @param bpp Bytes per pixel
+ * @param w Image width
+ * @param h Image height
+ * @return Size of output in bytes, or -1 if larger than out_size
+ */
+static int targa_encode_rle(uint8_t *outbuf, int out_size, const AVFrame *pic,
+ int bpp, int w, int h)
+{
+ int y,ret;
+ uint8_t *out;
+
+ out = outbuf;
+
+ for(y = 0; y < h; y ++) {
+ ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
+ if(ret == -1){
+ return -1;
+ }
+ out+= ret;
+ out_size -= ret;
+ }
+
+ return out - outbuf;
+}
+
+static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int w, int h)
+{
+ int i, n = bpp * w;
+ uint8_t *out = outbuf;
+ uint8_t *ptr = pic->data[0];
+
+ for(i=0; i < h; i++) {
+ memcpy(out, ptr, n);
+ out += n;
+ ptr += pic->linesize[0];
+ }
+
+ return out - outbuf;
+}
+
+static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
+ const AVFrame *p, int *got_packet)
+{
+ int bpp, picsize, datasize = -1, ret, i;
+ uint8_t *out;
+
+ if(avctx->width > 0xffff || avctx->height > 0xffff) {
+ av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
+ return AVERROR(EINVAL);
+ }
+ picsize = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
+ if ((ret = ff_alloc_packet2(avctx, pkt, picsize + 45)) < 0)
+ return ret;
+
+ /* zero out the header and only set applicable fields */
+ memset(pkt->data, 0, 12);
+ AV_WL16(pkt->data+12, avctx->width);
+ AV_WL16(pkt->data+14, avctx->height);
+ /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
+ pkt->data[17] = 0x20 | (avctx->pix_fmt == AV_PIX_FMT_BGRA ? 8 : 0);
+
+ out = pkt->data + 18; /* skip past the header we write */
+
+ avctx->bits_per_coded_sample = av_get_bits_per_pixel(av_pix_fmt_desc_get(avctx->pix_fmt));
+ switch(avctx->pix_fmt) {
+ case AV_PIX_FMT_PAL8: {
+ int pal_bpp = 24; /* Only write 32bit palette if there is transparency information */
+ for (i = 0; i < 256; i++)
+ if (AV_RN32(p->data[1] + 4 * i) >> 24 != 0xFF) {
+ pal_bpp = 32;
+ break;
+ }
+ pkt->data[1] = 1; /* palette present */
+ pkt->data[2] = TGA_PAL; /* uncompressed palettised image */
+ pkt->data[6] = 1; /* palette contains 256 entries */
+ pkt->data[7] = pal_bpp; /* palette contains pal_bpp bit entries */
+ pkt->data[16] = 8; /* bpp */
+ for (i = 0; i < 256; i++)
+ if (pal_bpp == 32) {
+ AV_WL32(pkt->data + 18 + 4 * i, *(uint32_t *)(p->data[1] + i * 4));
+ } else {
+ AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
+ }
+ out += 32 * pal_bpp; /* skip past the palette we just output */
+ break;
+ }
+ case AV_PIX_FMT_GRAY8:
+ pkt->data[2] = TGA_BW; /* uncompressed grayscale image */
+ avctx->bits_per_coded_sample = 0x28;
+ pkt->data[16] = 8; /* bpp */
+ break;
+ case AV_PIX_FMT_RGB555LE:
+ pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
+ avctx->bits_per_coded_sample =
+ pkt->data[16] = 16; /* bpp */
+ break;
+ case AV_PIX_FMT_BGR24:
+ pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
+ pkt->data[16] = 24; /* bpp */
+ break;
+ case AV_PIX_FMT_BGRA:
+ pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
+ pkt->data[16] = 32; /* bpp */
+ break;
+ default:
+ av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
+ av_get_pix_fmt_name(avctx->pix_fmt));
+ return AVERROR(EINVAL);
+ }
+ bpp = pkt->data[16] >> 3;
+
+ /* try RLE compression */
+ if (avctx->coder_type != FF_CODER_TYPE_RAW)
+ datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
+
+ /* if that worked well, mark the picture as RLE compressed */
+ if(datasize >= 0)
+ pkt->data[2] |= TGA_RLE;
+
+ /* if RLE didn't make it smaller, go back to no compression */
+ else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
+
+ out += datasize;
+
+ /* The standard recommends including this section, even if we don't use
+ * any of the features it affords. TODO: take advantage of the pixel
+ * aspect ratio and encoder ID fields available? */
+ memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
+
+ pkt->size = out + 26 - pkt->data;
+ pkt->flags |= AV_PKT_FLAG_KEY;
+ *got_packet = 1;
+
+ return 0;
+}
+
+static av_cold int targa_encode_init(AVCodecContext *avctx)
+{
+ TargaContext *s = avctx->priv_data;
+
+ avcodec_get_frame_defaults(&s->picture);
+ s->picture.key_frame= 1;
+ s->picture.pict_type = AV_PICTURE_TYPE_I;
+ avctx->coded_frame= &s->picture;
+
+ return 0;
+}
+
+AVCodec ff_targa_encoder = {
+ .name = "targa",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_TARGA,
+ .priv_data_size = sizeof(TargaContext),
+ .init = targa_encode_init,
+ .encode2 = targa_encode_frame,
+ .pix_fmts = (const enum AVPixelFormat[]){
+ AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
+ AV_PIX_FMT_NONE
+ },
+ .long_name= NULL_IF_CONFIG_SMALL("Truevision Targa image"),
+};
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