| /* |
| * 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/imgutils.h" |
| #include "libavutil/internal.h" |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/pixdesc.h" |
| #include "avcodec.h" |
| #include "internal.h" |
| #include "rle.h" |
| #include "targa.h" |
| |
| typedef struct TargaContext { |
| AVClass *class; |
| |
| int rle; |
| } 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) |
| { |
| TargaContext *s = avctx->priv_data; |
| int bpp, picsize, datasize = -1, ret, i; |
| uint8_t *out; |
| |
| picsize = av_image_get_buffer_size(avctx->pix_fmt, |
| avctx->width, avctx->height, 1); |
| if ((ret = ff_alloc_packet2(avctx, pkt, picsize + 45, 0)) < 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; |
| |
| |
| #if FF_API_CODER_TYPE |
| FF_DISABLE_DEPRECATION_WARNINGS |
| if (avctx->coder_type == FF_CODER_TYPE_RAW) |
| s->rle = 0; |
| FF_ENABLE_DEPRECATION_WARNINGS |
| #endif |
| |
| /* try RLE compression */ |
| if (s->rle) |
| 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) |
| { |
| if (avctx->width > 0xffff || avctx->height > 0xffff) { |
| av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| #if FF_API_CODED_FRAME |
| FF_DISABLE_DEPRECATION_WARNINGS |
| avctx->coded_frame->key_frame = 1; |
| avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; |
| FF_ENABLE_DEPRECATION_WARNINGS |
| #endif |
| |
| return 0; |
| } |
| |
| #define OFFSET(x) offsetof(TargaContext, x) |
| #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM |
| static const AVOption options[] = { |
| { "rle", "Use run-length compression", OFFSET(rle), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE }, |
| |
| { NULL }, |
| }; |
| |
| static const AVClass targa_class = { |
| .class_name = "targa", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| AVCodec ff_targa_encoder = { |
| .name = "targa", |
| .long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_TARGA, |
| .priv_data_size = sizeof(TargaContext), |
| .priv_class = &targa_class, |
| .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 |
| }, |
| }; |