Targa (.tga) encoder,

patch by Bobby Bingham % uhmmmm A gmail P com %
Only handles 24-bit BGR and 8-bit grayscale, no RLE at the moment either.
Original thread:
Date: Mar 11, 2007 7:58 PM
Subject: [Ffmpeg-devel] [PATCH] Targa encoder


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@8411 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/Makefile

@@ -139,6 +139,7 @@ OBJS-$(CONFIG_SVQ1_DECODER)            += svq1.o
 OBJS-$(CONFIG_SVQ1_ENCODER)            += svq1.o
 OBJS-$(CONFIG_SVQ3_DECODER)            += h264.o
 OBJS-$(CONFIG_TARGA_DECODER)           += targa.o
+OBJS-$(CONFIG_TARGA_ENCODER)           += targaenc.o
 OBJS-$(CONFIG_THEORA_DECODER)          += vp3.o
 OBJS-$(CONFIG_TIERTEXSEQVIDEO_DECODER) += tiertexseqv.o
 OBJS-$(CONFIG_TIFF_DECODER)            += tiff.o lzw.o

libavcodec/allcodecs.c

@@ -127,7 +127,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER(SP5X, sp5x);
     REGISTER_ENCDEC (SVQ1, svq1);
     REGISTER_DECODER(SVQ3, svq3);
-    REGISTER_DECODER(TARGA, targa);
+    REGISTER_ENCDEC (TARGA, targa);
     REGISTER_DECODER(THEORA, theora);
     REGISTER_DECODER(TIERTEXSEQVIDEO, tiertexseqvideo);
     REGISTER_DECODER(TIFF, tiff);

libavcodec/avcodec.h

@@ -2203,6 +2203,7 @@ extern AVCodec snow_encoder;
 extern AVCodec sonic_encoder;
 extern AVCodec sonic_ls_encoder;
 extern AVCodec svq1_encoder;
+extern AVCodec targa_encoder;
 extern AVCodec vcr1_encoder;
 extern AVCodec vorbis_encoder;
 extern AVCodec wmav1_encoder;

libavcodec/targaenc.c

+/*
+ * 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 "avcodec.h"
+
+static int targa_encode_frame(AVCodecContext *avctx,
+                              unsigned char *outbuf,
+                              int buf_size, void *data){
+    AVFrame *p = data;
+    int i, n, linesize;
+    uint8_t *ptr, *out;
+
+    if(avctx->width > 0xffff || avctx->height > 0xffff) {
+        av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
+        return -1;
+    }
+    if(buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 45) {
+        av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
+        return -1;
+    }
+
+    p->pict_type= FF_I_TYPE;
+    p->key_frame= 1;
+
+    /* zero out the header and only set applicable fields */
+    memset(outbuf, 0, 11);
+    AV_WL16(outbuf+12, avctx->width);
+    AV_WL16(outbuf+14, avctx->height);
+    outbuf[17] = 0x20;           /* origin is top-left. no alpha */
+
+    /* TODO: support alpha channel and other bit-depths.  and RLE? */
+    switch(avctx->pix_fmt) {
+    case PIX_FMT_GRAY8:
+        outbuf[2] = 3;           /* uncompressed grayscale image */
+        outbuf[16] = 8;          /* bpp */
+        n = avctx->width;
+        break;
+    case PIX_FMT_BGR24:
+        outbuf[2] = 2;           /* uncompressed true-color image */
+        outbuf[16] = 24;         /* bpp */
+        n = 3 * avctx->width;
+        break;
+    default:
+        return -1;
+    }
+
+    out = outbuf + 18;  /* skip past the header we just output */
+    ptr = p->data[0];
+    linesize = p->linesize[0];
+
+    for(i=0; i < avctx->height; i++) {
+        memcpy(out, ptr, n);
+        out += n;
+        ptr += linesize;
+    }
+
+    /* 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);
+
+    return out + 26 - outbuf;
+}
+
+static int targa_encode_init(AVCodecContext *avctx)
+{
+    return 0;
+}
+
+AVCodec targa_encoder = {
+    .name = "targa",
+    .type = CODEC_TYPE_VIDEO,
+    .id = CODEC_ID_TARGA,
+    .priv_data_size = 0,
+    .init = targa_encode_init,
+    .encode = targa_encode_frame,
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_GRAY8, -1},
+};

libavformat/riff.c

@@ -167,6 +167,7 @@ const AVCodecTag codec_bmp_tags[] = {
     { CODEC_ID_CAVS, MKTAG('C', 'A', 'V', 'S') },
     { CODEC_ID_JPEG2000, MKTAG('M', 'J', '2', 'C') },
     { CODEC_ID_VMNC, MKTAG('V', 'M', 'n', 'c') },
+    { CODEC_ID_TARGA, MKTAG('t', 'g', 'a', ' ') },
     { CODEC_ID_NONE, 0 },
 };