470 lines
15 KiB
C
470 lines
15 KiB
C
/*
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* TIFF image encoder
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* Copyright (c) 2007 Bartlomiej Wolowiec
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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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/**
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* @file
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* TIFF image encoder
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* @author Bartlomiej Wolowiec
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*/
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#include "avcodec.h"
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#if CONFIG_ZLIB
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#include <zlib.h>
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#endif
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#include "libavutil/opt.h"
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#include "bytestream.h"
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#include "tiff.h"
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#include "rle.h"
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#include "lzw.h"
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#include "put_bits.h"
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#define TIFF_MAX_ENTRY 32
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/** sizes of various TIFF field types (string size = 1)*/
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static const uint8_t type_sizes2[6] = {
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0, 1, 1, 2, 4, 8
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};
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typedef struct TiffEncoderContext {
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AVClass *avclass;
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AVCodecContext *avctx;
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AVFrame picture;
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int width; ///< picture width
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int height; ///< picture height
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unsigned int bpp; ///< bits per pixel
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int compr; ///< compression level
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int bpp_tab_size; ///< bpp_tab size
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int photometric_interpretation; ///< photometric interpretation
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int strips; ///< number of strips
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int rps; ///< row per strip
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uint8_t entries[TIFF_MAX_ENTRY*12]; ///< entires in header
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int num_entries; ///< number of entires
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uint8_t **buf; ///< actual position in buffer
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uint8_t *buf_start; ///< pointer to first byte in buffer
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int buf_size; ///< buffer size
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uint16_t subsampling[2]; ///< YUV subsampling factors
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struct LZWEncodeState *lzws; ///< LZW Encode state
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uint32_t dpi; ///< image resolution in DPI
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} TiffEncoderContext;
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/**
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* Check free space in buffer
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* @param s Tiff context
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* @param need Needed bytes
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* @return 0 - ok, 1 - no free space
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*/
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inline static int check_size(TiffEncoderContext * s, uint64_t need)
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{
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if (s->buf_size < *s->buf - s->buf_start + need) {
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*s->buf = s->buf_start + s->buf_size + 1;
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av_log(s->avctx, AV_LOG_ERROR, "Buffer is too small\n");
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return 1;
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}
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return 0;
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}
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/**
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* Put n values to buffer
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*
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* @param p Pointer to pointer to output buffer
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* @param n Number of values
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* @param val Pointer to values
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* @param type Type of values
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* @param flip =0 - normal copy, >0 - flip
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*/
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static void tnput(uint8_t ** p, int n, const uint8_t * val, enum TiffTypes type,
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int flip)
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{
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int i;
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#if HAVE_BIGENDIAN
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flip ^= ((int[]) {0, 0, 0, 1, 3, 3})[type];
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#endif
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for (i = 0; i < n * type_sizes2[type]; i++)
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*(*p)++ = val[i ^ flip];
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}
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/**
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* Add entry to directory in tiff header.
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* @param s Tiff context
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* @param tag Tag that identifies the entry
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* @param type Entry type
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* @param count The number of values
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* @param ptr_val Pointer to values
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*/
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static void add_entry(TiffEncoderContext * s,
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enum TiffTags tag, enum TiffTypes type, int count,
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const void *ptr_val)
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{
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uint8_t *entries_ptr = s->entries + 12 * s->num_entries;
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assert(s->num_entries < TIFF_MAX_ENTRY);
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bytestream_put_le16(&entries_ptr, tag);
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bytestream_put_le16(&entries_ptr, type);
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bytestream_put_le32(&entries_ptr, count);
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if (type_sizes[type] * count <= 4) {
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tnput(&entries_ptr, count, ptr_val, type, 0);
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} else {
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bytestream_put_le32(&entries_ptr, *s->buf - s->buf_start);
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check_size(s, count * type_sizes2[type]);
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tnput(s->buf, count, ptr_val, type, 0);
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}
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s->num_entries++;
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}
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static void add_entry1(TiffEncoderContext * s,
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enum TiffTags tag, enum TiffTypes type, int val){
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uint16_t w = val;
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uint32_t dw= val;
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add_entry(s, tag, type, 1, type == TIFF_SHORT ? (void *)&w : (void *)&dw);
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}
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/**
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* Encode one strip in tiff file
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*
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* @param s Tiff context
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* @param src Input buffer
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* @param dst Output buffer
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* @param n Size of input buffer
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* @param compr Compression method
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* @return Number of output bytes. If an output error is encountered, -1 returned
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*/
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static int encode_strip(TiffEncoderContext * s, const int8_t * src,
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uint8_t * dst, int n, int compr)
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{
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switch (compr) {
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#if CONFIG_ZLIB
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case TIFF_DEFLATE:
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case TIFF_ADOBE_DEFLATE:
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{
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unsigned long zlen = s->buf_size - (*s->buf - s->buf_start);
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if (compress(dst, &zlen, src, n) != Z_OK) {
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av_log(s->avctx, AV_LOG_ERROR, "Compressing failed\n");
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return -1;
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}
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return zlen;
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}
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#endif
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case TIFF_RAW:
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if (check_size(s, n))
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return -1;
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memcpy(dst, src, n);
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return n;
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case TIFF_PACKBITS:
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return ff_rle_encode(dst, s->buf_size - (*s->buf - s->buf_start), src, 1, n, 2, 0xff, -1, 0);
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case TIFF_LZW:
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return ff_lzw_encode(s->lzws, src, n);
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default:
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return -1;
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}
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}
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static void pack_yuv(TiffEncoderContext * s, uint8_t * dst, int lnum)
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{
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AVFrame *p = &s->picture;
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int i, j, k;
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int w = (s->width - 1) / s->subsampling[0] + 1;
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uint8_t *pu = &p->data[1][lnum / s->subsampling[1] * p->linesize[1]];
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uint8_t *pv = &p->data[2][lnum / s->subsampling[1] * p->linesize[2]];
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for (i = 0; i < w; i++){
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for (j = 0; j < s->subsampling[1]; j++)
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for (k = 0; k < s->subsampling[0]; k++)
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*dst++ = p->data[0][(lnum + j) * p->linesize[0] +
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i * s->subsampling[0] + k];
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*dst++ = *pu++;
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*dst++ = *pv++;
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}
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}
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static int encode_frame(AVCodecContext * avctx, unsigned char *buf,
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int buf_size, void *data)
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{
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TiffEncoderContext *s = avctx->priv_data;
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AVFrame *pict = data;
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AVFrame *const p = (AVFrame *) & s->picture;
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int i;
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int n;
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uint8_t *ptr = buf;
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uint8_t *offset;
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uint32_t strips;
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uint32_t *strip_sizes = NULL;
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uint32_t *strip_offsets = NULL;
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int bytes_per_row;
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uint32_t res[2] = { s->dpi, 1 }; // image resolution (72/1)
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uint16_t bpp_tab[] = { 8, 8, 8, 8 };
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int ret = -1;
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int is_yuv = 0;
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uint8_t *yuv_line = NULL;
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int shift_h, shift_v;
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s->avctx = avctx;
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s->buf_start = buf;
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s->buf = &ptr;
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s->buf_size = buf_size;
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*p = *pict;
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p->pict_type = AV_PICTURE_TYPE_I;
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p->key_frame = 1;
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avctx->coded_frame= &s->picture;
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s->compr = TIFF_PACKBITS;
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if (avctx->compression_level == 0) {
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s->compr = TIFF_RAW;
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} else if(avctx->compression_level == 2) {
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s->compr = TIFF_LZW;
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#if CONFIG_ZLIB
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} else if ((avctx->compression_level >= 3)) {
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s->compr = TIFF_DEFLATE;
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#endif
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}
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s->width = avctx->width;
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s->height = avctx->height;
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s->subsampling[0] = 1;
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s->subsampling[1] = 1;
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switch (avctx->pix_fmt) {
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case PIX_FMT_RGB24:
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s->bpp = 24;
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s->photometric_interpretation = 2;
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break;
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case PIX_FMT_GRAY8:
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s->bpp = 8;
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s->photometric_interpretation = 1;
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break;
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case PIX_FMT_PAL8:
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s->bpp = 8;
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s->photometric_interpretation = 3;
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break;
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case PIX_FMT_MONOBLACK:
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case PIX_FMT_MONOWHITE:
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s->bpp = 1;
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s->photometric_interpretation = avctx->pix_fmt == PIX_FMT_MONOBLACK;
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bpp_tab[0] = 1;
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break;
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case PIX_FMT_YUV420P:
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case PIX_FMT_YUV422P:
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case PIX_FMT_YUV444P:
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case PIX_FMT_YUV410P:
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case PIX_FMT_YUV411P:
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s->photometric_interpretation = 6;
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avcodec_get_chroma_sub_sample(avctx->pix_fmt,
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&shift_h, &shift_v);
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s->bpp = 8 + (16 >> (shift_h + shift_v));
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s->subsampling[0] = 1 << shift_h;
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s->subsampling[1] = 1 << shift_v;
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s->bpp_tab_size = 3;
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is_yuv = 1;
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break;
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default:
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av_log(s->avctx, AV_LOG_ERROR,
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"This colors format is not supported\n");
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return -1;
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}
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if (!is_yuv)
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s->bpp_tab_size = ((s->bpp + 7) >> 3);
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if (s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE || s->compr == TIFF_LZW)
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//best choose for DEFLATE
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s->rps = s->height;
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else
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s->rps = FFMAX(8192 / (((s->width * s->bpp) >> 3) + 1), 1); // suggest size of strip
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s->rps = ((s->rps - 1) / s->subsampling[1] + 1) * s->subsampling[1]; // round rps up
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strips = (s->height - 1) / s->rps + 1;
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if (check_size(s, 8))
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goto fail;
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// write header
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bytestream_put_le16(&ptr, 0x4949);
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bytestream_put_le16(&ptr, 42);
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offset = ptr;
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bytestream_put_le32(&ptr, 0);
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strip_sizes = av_mallocz(sizeof(*strip_sizes) * strips);
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strip_offsets = av_mallocz(sizeof(*strip_offsets) * strips);
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bytes_per_row = (((s->width - 1)/s->subsampling[0] + 1) * s->bpp
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* s->subsampling[0] * s->subsampling[1] + 7) >> 3;
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if (is_yuv){
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yuv_line = av_malloc(bytes_per_row);
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if (yuv_line == NULL){
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av_log(s->avctx, AV_LOG_ERROR, "Not enough memory\n");
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goto fail;
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}
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}
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#if CONFIG_ZLIB
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if (s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE) {
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uint8_t *zbuf;
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int zlen, zn;
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int j;
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zlen = bytes_per_row * s->rps;
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zbuf = av_malloc(zlen);
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strip_offsets[0] = ptr - buf;
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zn = 0;
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for (j = 0; j < s->rps; j++) {
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if (is_yuv){
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pack_yuv(s, yuv_line, j);
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memcpy(zbuf + zn, yuv_line, bytes_per_row);
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j += s->subsampling[1] - 1;
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}
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else
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memcpy(zbuf + j * bytes_per_row,
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p->data[0] + j * p->linesize[0], bytes_per_row);
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zn += bytes_per_row;
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}
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n = encode_strip(s, zbuf, ptr, zn, s->compr);
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av_free(zbuf);
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if (n<0) {
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av_log(s->avctx, AV_LOG_ERROR, "Encode strip failed\n");
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goto fail;
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}
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ptr += n;
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strip_sizes[0] = ptr - buf - strip_offsets[0];
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} else
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#endif
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{
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if(s->compr == TIFF_LZW)
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s->lzws = av_malloc(ff_lzw_encode_state_size);
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for (i = 0; i < s->height; i++) {
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if (strip_sizes[i / s->rps] == 0) {
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if(s->compr == TIFF_LZW){
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ff_lzw_encode_init(s->lzws, ptr, s->buf_size - (*s->buf - s->buf_start),
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12, FF_LZW_TIFF, put_bits);
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}
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strip_offsets[i / s->rps] = ptr - buf;
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}
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if (is_yuv){
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pack_yuv(s, yuv_line, i);
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n = encode_strip(s, yuv_line, ptr, bytes_per_row, s->compr);
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i += s->subsampling[1] - 1;
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}
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else
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n = encode_strip(s, p->data[0] + i * p->linesize[0],
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ptr, bytes_per_row, s->compr);
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if (n < 0) {
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av_log(s->avctx, AV_LOG_ERROR, "Encode strip failed\n");
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goto fail;
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}
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strip_sizes[i / s->rps] += n;
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ptr += n;
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if(s->compr == TIFF_LZW && (i==s->height-1 || i%s->rps == s->rps-1)){
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int ret;
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ret = ff_lzw_encode_flush(s->lzws, flush_put_bits);
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strip_sizes[(i / s->rps )] += ret ;
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ptr += ret;
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}
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}
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if(s->compr == TIFF_LZW)
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av_free(s->lzws);
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}
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s->num_entries = 0;
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add_entry1(s,TIFF_SUBFILE, TIFF_LONG, 0);
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add_entry1(s,TIFF_WIDTH, TIFF_LONG, s->width);
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add_entry1(s,TIFF_HEIGHT, TIFF_LONG, s->height);
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if (s->bpp_tab_size)
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add_entry(s, TIFF_BPP, TIFF_SHORT, s->bpp_tab_size, bpp_tab);
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add_entry1(s,TIFF_COMPR, TIFF_SHORT, s->compr);
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add_entry1(s,TIFF_INVERT, TIFF_SHORT, s->photometric_interpretation);
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add_entry(s, TIFF_STRIP_OFFS, TIFF_LONG, strips, strip_offsets);
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if (s->bpp_tab_size)
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add_entry1(s,TIFF_SAMPLES_PER_PIXEL, TIFF_SHORT, s->bpp_tab_size);
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add_entry1(s,TIFF_ROWSPERSTRIP, TIFF_LONG, s->rps);
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add_entry(s, TIFF_STRIP_SIZE, TIFF_LONG, strips, strip_sizes);
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add_entry(s, TIFF_XRES, TIFF_RATIONAL, 1, res);
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add_entry(s, TIFF_YRES, TIFF_RATIONAL, 1, res);
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add_entry1(s,TIFF_RES_UNIT, TIFF_SHORT, 2);
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if(!(avctx->flags & CODEC_FLAG_BITEXACT))
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add_entry(s, TIFF_SOFTWARE_NAME, TIFF_STRING,
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strlen(LIBAVCODEC_IDENT) + 1, LIBAVCODEC_IDENT);
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if (avctx->pix_fmt == PIX_FMT_PAL8) {
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uint16_t pal[256 * 3];
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for (i = 0; i < 256; i++) {
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uint32_t rgb = *(uint32_t *) (p->data[1] + i * 4);
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pal[i] = ((rgb >> 16) & 0xff) * 257;
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pal[i + 256] = ((rgb >> 8 ) & 0xff) * 257;
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pal[i + 512] = ( rgb & 0xff) * 257;
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}
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add_entry(s, TIFF_PAL, TIFF_SHORT, 256 * 3, pal);
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}
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if (is_yuv){
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/** according to CCIR Recommendation 601.1 */
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uint32_t refbw[12] = {15, 1, 235, 1, 128, 1, 240, 1, 128, 1, 240, 1};
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add_entry(s, TIFF_YCBCR_SUBSAMPLING, TIFF_SHORT, 2, s->subsampling);
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add_entry(s, TIFF_REFERENCE_BW, TIFF_RATIONAL, 6, refbw);
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}
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bytestream_put_le32(&offset, ptr - buf); // write offset to dir
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if (check_size(s, 6 + s->num_entries * 12))
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goto fail;
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bytestream_put_le16(&ptr, s->num_entries); // write tag count
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bytestream_put_buffer(&ptr, s->entries, s->num_entries * 12);
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bytestream_put_le32(&ptr, 0);
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ret = ptr - buf;
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fail:
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av_free(strip_sizes);
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av_free(strip_offsets);
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av_free(yuv_line);
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return ret;
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}
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static const AVOption options[]={
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{"dpi", "set the image resolution (in dpi)", offsetof(TiffEncoderContext, dpi), FF_OPT_TYPE_INT, {.dbl = 72}, 1, 0x10000, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_ENCODING_PARAM},
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{NULL}
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};
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static const AVClass class = { "tiff", av_default_item_name, options, LIBAVUTIL_VERSION_INT };
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AVCodec ff_tiff_encoder = {
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.name = "tiff",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_TIFF,
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.priv_data_size = sizeof(TiffEncoderContext),
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.encode = encode_frame,
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.pix_fmts =
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(const enum PixelFormat[]) {PIX_FMT_RGB24, PIX_FMT_PAL8, PIX_FMT_GRAY8,
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PIX_FMT_MONOBLACK, PIX_FMT_MONOWHITE,
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PIX_FMT_YUV420P, PIX_FMT_YUV422P,
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PIX_FMT_YUV444P, PIX_FMT_YUV410P,
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PIX_FMT_YUV411P,
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PIX_FMT_NONE},
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.long_name = NULL_IF_CONFIG_SMALL("TIFF image"),
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.priv_class= &class,
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};
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