libavcodec/targaenc.c - nest-android-app/ffmpeg - Git at Google

 /*
  * 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;

     if(avctx->width > 0xffff || avctx->height > 0xffff) {
         av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
         return AVERROR(EINVAL);
     }
     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 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
     },
 };
	/*
	* 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;

	if(avctx->width > 0xffff \|\| avctx->height > 0xffff) {
	av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
	return AVERROR(EINVAL);
	}
	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 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
	},
	};