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4243da4ff4
This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
220 lines
7.1 KiB
C
220 lines
7.1 KiB
C
/*
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* Targa (.tga) image encoder
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* Copyright (c) 2007 Bobby Bingham
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avcodec.h"
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#include "codec_internal.h"
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#include "encode.h"
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#include "rle.h"
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#include "targa.h"
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typedef struct TargaContext {
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AVClass *class;
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int rle;
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} TargaContext;
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/**
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* RLE compress the image, with maximum size of out_size
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* @param outbuf Output buffer
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* @param out_size Maximum output size
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* @param pic Image to compress
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* @param bpp Bytes per pixel
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* @param w Image width
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* @param h Image height
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* @return Size of output in bytes, or -1 if larger than out_size
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*/
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static int targa_encode_rle(uint8_t *outbuf, int out_size, const AVFrame *pic,
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int bpp, int w, int h)
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{
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int y,ret;
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uint8_t *out;
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out = outbuf;
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for(y = 0; y < h; y ++) {
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ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
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if(ret == -1){
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return -1;
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}
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out+= ret;
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out_size -= ret;
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}
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return out - outbuf;
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}
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static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int w, int h)
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{
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int i, n = bpp * w;
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uint8_t *out = outbuf;
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uint8_t *ptr = pic->data[0];
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for(i=0; i < h; i++) {
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memcpy(out, ptr, n);
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out += n;
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ptr += pic->linesize[0];
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}
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return out - outbuf;
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}
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static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *p, int *got_packet)
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{
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TargaContext *s = avctx->priv_data;
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int bpp, picsize, datasize = -1, ret, i;
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uint8_t *out;
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picsize = av_image_get_buffer_size(avctx->pix_fmt,
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avctx->width, avctx->height, 1);
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if ((ret = ff_alloc_packet(avctx, pkt, picsize + 45)) < 0)
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return ret;
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/* zero out the header and only set applicable fields */
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memset(pkt->data, 0, 12);
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AV_WL16(pkt->data+12, avctx->width);
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AV_WL16(pkt->data+14, avctx->height);
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/* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
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pkt->data[17] = 0x20 | (avctx->pix_fmt == AV_PIX_FMT_BGRA ? 8 : 0);
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out = pkt->data + 18; /* skip past the header we write */
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avctx->bits_per_coded_sample = av_get_bits_per_pixel(av_pix_fmt_desc_get(avctx->pix_fmt));
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switch(avctx->pix_fmt) {
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case AV_PIX_FMT_PAL8: {
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int pal_bpp = 24; /* Only write 32bit palette if there is transparency information */
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for (i = 0; i < 256; i++)
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if (AV_RN32(p->data[1] + 4 * i) >> 24 != 0xFF) {
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pal_bpp = 32;
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break;
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}
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pkt->data[1] = 1; /* palette present */
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pkt->data[2] = TGA_PAL; /* uncompressed palettised image */
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pkt->data[6] = 1; /* palette contains 256 entries */
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pkt->data[7] = pal_bpp; /* palette contains pal_bpp bit entries */
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pkt->data[16] = 8; /* bpp */
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for (i = 0; i < 256; i++)
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if (pal_bpp == 32) {
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AV_WL32(pkt->data + 18 + 4 * i, *(uint32_t *)(p->data[1] + i * 4));
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} else {
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AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
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}
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out += 32 * pal_bpp; /* skip past the palette we just output */
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break;
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}
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case AV_PIX_FMT_GRAY8:
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pkt->data[2] = TGA_BW; /* uncompressed grayscale image */
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avctx->bits_per_coded_sample = 0x28;
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pkt->data[16] = 8; /* bpp */
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break;
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case AV_PIX_FMT_RGB555LE:
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pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
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avctx->bits_per_coded_sample =
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pkt->data[16] = 16; /* bpp */
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break;
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case AV_PIX_FMT_BGR24:
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pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
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pkt->data[16] = 24; /* bpp */
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break;
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case AV_PIX_FMT_BGRA:
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pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
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pkt->data[16] = 32; /* bpp */
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
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av_get_pix_fmt_name(avctx->pix_fmt));
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return AVERROR(EINVAL);
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}
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bpp = pkt->data[16] >> 3;
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/* try RLE compression */
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if (s->rle)
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datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
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/* if that worked well, mark the picture as RLE compressed */
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if(datasize >= 0)
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pkt->data[2] |= TGA_RLE;
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/* if RLE didn't make it smaller, go back to no compression */
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else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
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out += datasize;
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/* The standard recommends including this section, even if we don't use
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* any of the features it affords. TODO: take advantage of the pixel
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* aspect ratio and encoder ID fields available? */
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memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
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pkt->size = out + 26 - pkt->data;
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*got_packet = 1;
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return 0;
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}
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static av_cold int targa_encode_init(AVCodecContext *avctx)
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{
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if (avctx->width > 0xffff || avctx->height > 0xffff) {
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av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
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return AVERROR(EINVAL);
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}
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return 0;
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}
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#define OFFSET(x) offsetof(TargaContext, x)
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#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "rle", "Use run-length compression", OFFSET(rle), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
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{ NULL },
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};
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static const AVClass targa_class = {
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.class_name = "targa",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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const FFCodec ff_targa_encoder = {
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.p.name = "targa",
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.p.long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_TARGA,
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.priv_data_size = sizeof(TargaContext),
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.p.priv_class = &targa_class,
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.init = targa_encode_init,
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FF_CODEC_ENCODE_CB(targa_encode_frame),
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.p.pix_fmts = (const enum AVPixelFormat[]){
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AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
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AV_PIX_FMT_NONE
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},
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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