[Ffmpeg-devel] [RFC] .tga decoder
Kostya
kostya.shishkov
Mon Oct 9 13:08:20 CEST 2006
Here is my Targa files decoder. It tested to work on .tga files
created with ImageMagick and on movs with different depth which can
be found here: http://www.openquicktime.org/files.php (named aletrek-*.mov)
-------------- next part --------------
Index: libavcodec/allcodecs.c
===================================================================
--- libavcodec/allcodecs.c (revision 6582)
+++ libavcodec/allcodecs.c (working copy)
@@ -545,6 +545,9 @@
#ifdef CONFIG_WAVPACK_DECODER
register_avcodec(&wavpack_decoder);
#endif //CONFIG_WAVPACK_DECODER
+#ifdef CONFIG_TARGA_DECODER
+ register_avcodec(&targa_decoder);
+#endif //CONFIG_TARGA_DECODER
#if defined(CONFIG_AMR_NB) || defined(CONFIG_AMR_NB_FIXED)
#ifdef CONFIG_AMR_NB_DECODER
Index: libavcodec/Makefile
===================================================================
--- libavcodec/Makefile (revision 6582)
+++ libavcodec/Makefile (working copy)
@@ -131,6 +131,7 @@
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-$(CONFIG_THEORA_DECODER) += vp3.o
OBJS-$(CONFIG_TRUEMOTION1_DECODER) += truemotion1.o
OBJS-$(CONFIG_TRUEMOTION2_DECODER) += truemotion2.o
Index: libavcodec/avcodec.h
===================================================================
--- libavcodec/avcodec.h (revision 6582)
+++ libavcodec/avcodec.h (working copy)
@@ -144,6 +144,7 @@
CODEC_ID_VP5,
CODEC_ID_VP6,
CODEC_ID_VP6F,
+ CODEC_ID_TARGA,
/* various pcm "codecs" */
CODEC_ID_PCM_S16LE= 0x10000,
@@ -2292,6 +2293,7 @@
extern AVCodec cavs_decoder;
extern AVCodec vmnc_decoder;
extern AVCodec wavpack_decoder;
+extern AVCodec targa_decoder;
/* pcm codecs */
#define PCM_CODEC(id, name) \
Index: libavcodec/targa.c
===================================================================
--- libavcodec/targa.c (revision 0)
+++ libavcodec/targa.c (revision 0)
@@ -0,0 +1,270 @@
+/*
+ * Targa (.tga) image decoder
+ * Copyright (c) 2006 Konstantin Shishkov
+ *
+ * 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"
+
+enum TargaCompr{
+ TGA_NODATA = 0, // no image data
+ TGA_PAL = 1, // palettized
+ TGA_RGB = 2, // true-color
+ TGA_BW = 3, // black & white or grayscale
+ TGA_RLE = 8, // flag pointing that data is RLE-coded
+};
+
+typedef struct TargaContext {
+ AVFrame picture;
+
+ int width, height;
+ int bpp;
+ int color_type;
+ int compression_type;
+} TargaContext;
+
+static void targa_decode_rle(AVCodecContext *avctx, TargaContext *s, uint8_t *src, uint8_t *dst, int w, int h, int stride, int bpp)
+{
+ int i, x, y;
+ int depth = (bpp + 1) / 8;
+ int type, count;
+ int diff;
+
+ diff = stride - w * depth;
+ x = y = 0;
+ while(y < h){
+ type = *src++;
+ count = (type & 0x7F) + 1;
+ if((x + count > w) && (y + (x + count + 1)/w > h)){
+ av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds: position (%i,%i) size %i\n", x, y, count);
+ return;
+ }
+ if(type & 0x80){ // RLE
+ for(i = 0; i < count; i++){
+ switch(depth){
+ case 1:
+ *dst = *src;
+ break;
+ case 2:
+ *((uint16_t*)dst) = LE_16(src);
+ break;
+ case 3:
+ dst[0] = src[0];
+ dst[1] = src[1];
+ dst[2] = src[2];
+ break;
+ }
+ dst += depth;
+ x++;
+ if(x == w){
+ x = 0;
+ y++;
+ dst += diff;
+ }
+ }
+ src += depth;
+ }else{ // copy
+ for(i = 0; i < count; i++){
+ switch(depth){
+ case 1:
+ *dst++ = *src++;
+ break;
+ case 2:
+ *((uint16_t*)dst) = LE_16(src);
+ dst += 2; src += 2;
+ break;
+ case 3:
+ *dst++ = *src++;
+ *dst++ = *src++;
+ *dst++ = *src++;
+ break;
+ }
+ x++;
+ if(x == w){
+ x = 0;
+ y++;
+ dst += diff;
+ }
+ }
+ }
+ }
+}
+
+static int decode_frame(AVCodecContext *avctx,
+ void *data, int *data_size,
+ uint8_t *buf, int buf_size)
+{
+ TargaContext * const s = avctx->priv_data;
+ AVFrame *picture = data;
+ AVFrame * const p= (AVFrame*)&s->picture;
+ uint8_t *dst;
+ int stride;
+ int idlen, pal, compr, x, y, w, h, bpp, flags;
+ int first_clr, colors, csize;
+
+ /* parse image header */
+ idlen = *buf++;
+ pal = *buf++;
+ compr = *buf++;
+ first_clr = LE_16(buf); buf += 2;
+ colors = LE_16(buf); buf += 2;
+ csize = *buf++;
+ x = LE_16(buf); buf += 2;
+ y = LE_16(buf); buf += 2;
+ w = LE_16(buf); buf += 2;
+ h = LE_16(buf); buf += 2;
+ bpp = *buf++;
+ flags = *buf++;
+ //skip identifier if any
+ buf += idlen;
+ s->bpp = bpp;
+ s->width = w;
+ s->height = h;
+ switch(s->bpp){
+ case 8:
+ avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? PIX_FMT_GRAY8 : PIX_FMT_PAL8;
+ break;
+ case 15:
+ avctx->pix_fmt = PIX_FMT_RGB555;
+ break;
+ case 16:
+ avctx->pix_fmt = PIX_FMT_RGB555;
+ break;
+ case 24:
+ avctx->pix_fmt = PIX_FMT_BGR24;
+ break;
+ default:
+ av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", avctx->bits_per_sample);
+ return -1;
+ }
+
+ if(s->picture.data[0])
+ avctx->release_buffer(avctx, &s->picture);
+
+ if(avcodec_check_dimensions(avctx, w, h))
+ return -1;
+ if(w != avctx->width || h != avctx->height)
+ avcodec_set_dimensions(avctx, w, h);
+ if(avctx->get_buffer(avctx, p) < 0){
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return -1;
+ }
+ if(flags & 0x20){
+ dst = p->data[0];
+ stride = p->linesize[0];
+ }else{ //image is upside-down
+ dst = p->data[0] + p->linesize[0] * (h - 1);
+ stride = -p->linesize[0];
+ }
+
+ if(avctx->pix_fmt == PIX_FMT_PAL8 && avctx->palctrl){
+ memcpy(p->data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
+ if(avctx->palctrl->palette_changed){
+ p->palette_has_changed = 1;
+ avctx->palctrl->palette_changed = 0;
+ }
+ }
+ if(colors){
+ if((colors + first_clr) > 256){
+ av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
+ return -1;
+ }
+ if(csize != 24){
+ av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize);
+ return -1;
+ }
+ if(avctx->pix_fmt != PIX_FMT_PAL8)//should not occur but skip palette anyway
+ buf += colors * ((csize + 1) >> 3);
+ else{
+ int r, g, b, t;
+ int32_t *pal = ((int32_t*)p->data[1]) + first_clr;
+ for(t = 0; t < colors; t++){
+ r = *buf++;
+ g = *buf++;
+ b = *buf++;
+ *pal++ = (b << 16) | (g << 8) | r;
+ }
+ p->palette_has_changed = 1;
+ avctx->palctrl->palette_changed = 0;
+ }
+ }
+ if((compr & (~TGA_RLE)) == TGA_NODATA)
+ memset(p->data[0], 0, p->linesize[0] * s->height);
+ else{
+ if(compr & TGA_RLE)
+ targa_decode_rle(avctx, s, buf, dst, avctx->width, avctx->height, stride, bpp);
+ else{
+ uint16_t *dst16;
+ for(y = 0; y < s->height; y++){
+ switch(s->bpp){
+ case 8:
+ memcpy(dst, buf, s->width);
+ break;
+ case 15:
+ case 16:
+ dst16 = (uint16_t*)dst;
+ for(x = 0; x < s->width; x++)
+ dst16[x] = LE_16(buf + x*2);
+ break;
+ case 24:
+ memcpy(dst, buf, s->width * 3);
+ break;
+ }
+ dst += stride;
+ buf += s->width * ((s->bpp + 1) >> 3);
+ }
+ }
+ }
+
+ *picture= *(AVFrame*)&s->picture;
+ *data_size = sizeof(AVPicture);
+
+ return buf_size;
+}
+
+static int targa_init(AVCodecContext *avctx){
+ TargaContext *s = avctx->priv_data;
+
+ avcodec_get_frame_defaults((AVFrame*)&s->picture);
+ avctx->coded_frame= (AVFrame*)&s->picture;
+ s->picture.data[0] = NULL;
+
+ return 0;
+}
+
+static int targa_end(AVCodecContext *avctx){
+ TargaContext *s = avctx->priv_data;
+
+ if(s->picture.data[0])
+ avctx->release_buffer(avctx, &s->picture);
+
+ return 0;
+}
+
+AVCodec targa_decoder = {
+ "targa",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_TARGA,
+ sizeof(TargaContext),
+ targa_init,
+ NULL,
+ targa_end,
+ decode_frame,
+ 0,
+ NULL
+};
Index: libavformat/mov.c
===================================================================
--- libavformat/mov.c (revision 6582)
+++ libavformat/mov.c (working copy)
@@ -117,6 +117,7 @@
{ CODEC_ID_DVVIDEO, MKTAG('d', 'v', '5', 'n') }, /* DVCPRO50 NTSC produced by FCP */
{ CODEC_ID_DVVIDEO, MKTAG('A', 'V', 'd', 'v') }, /* AVID DV */
//{ CODEC_ID_JPEG2000, MKTAG('m', 'j', 'p', '2') }, /* JPEG 2000 produced by FCP */
+ { CODEC_ID_TARGA, MKTAG('t', 'g', 'a', ' ') }, /* Truevision Targa */
{ CODEC_ID_RAWVIDEO, MKTAG('2', 'v', 'u', 'y') }, /* UNCOMPRESSED 8BIT 4:2:2 */
{ CODEC_ID_NONE, 0 },
};
Index: Changelog
===================================================================
--- Changelog (revision 6582)
+++ Changelog (working copy)
@@ -59,6 +59,7 @@
- VP5 video decoder
- VP6 video decoder
- WavPack lossless audio decoder
+- Targa (.TGA) picture decoder
version 0.4.9-pre1:
Index: doc/ffmpeg-doc.texi
===================================================================
--- doc/ffmpeg-doc.texi (revision 6582)
+++ doc/ffmpeg-doc.texi (working copy)
@@ -753,6 +753,7 @@
@item .Y.U.V @tab X @tab X @tab one raw file per component
@item animated GIF @tab X @tab X @tab Only uncompressed GIFs are generated.
@item PNG @tab X @tab X @tab 2 bit and 4 bit/pixel not supported yet.
+ at item Targa @tab @tab X @tab Targa (.TGA) image format.
@item SGI @tab X @tab X @tab SGI RGB image format
@end multitable
Index: MAINTAINERS
===================================================================
--- MAINTAINERS (revision 6582)
+++ MAINTAINERS (working copy)
@@ -155,6 +155,7 @@
snow.c Michael Niedermayer, Loren Merritt
sonic.c Alex Beregszaszi
svq3.c Michael Niedermayer
+ targa.c Kostya Shishkov
truemotion1* Mike Melanson
truemotion2* Kostya Shishkov
truespeech.c Kostya Shishkov
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