/* * TIFF image encoder * Copyright (c) 2007 Bartlomiej Wolowiec * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * TIFF image encoder * @file * @author Bartlomiej Wolowiec */ #include "avcodec.h" #if CONFIG_ZLIB #include <zlib.h> #endif #include "bytestream.h" #include "tiff.h" #include "rle.h" #include "lzw.h" #include "put_bits.h" #define TIFF_MAX_ENTRY 32 /** sizes of various TIFF field types (string size = 1)*/ static const uint8_t type_sizes2[6] = { 0, 1, 1, 2, 4, 8 }; typedef struct TiffEncoderContext { AVCodecContext *avctx; AVFrame picture; int width; ///< picture width int height; ///< picture height unsigned int bpp; ///< bits per pixel int compr; ///< compression level int bpp_tab_size; ///< bpp_tab size int photometric_interpretation; ///< photometric interpretation int strips; ///< number of strips int rps; ///< row per strip uint8_t entries[TIFF_MAX_ENTRY*12]; ///< entires in header int num_entries; ///< number of entires uint8_t **buf; ///< actual position in buffer uint8_t *buf_start; ///< pointer to first byte in buffer int buf_size; ///< buffer size uint16_t subsampling[2]; ///< YUV subsampling factors struct LZWEncodeState *lzws; ///< LZW Encode state } TiffEncoderContext; /** * Check free space in buffer * @param s Tiff context * @param need Needed bytes * @return 0 - ok, 1 - no free space */ inline static int check_size(TiffEncoderContext * s, uint64_t need) { if (s->buf_size < *s->buf - s->buf_start + need) { *s->buf = s->buf_start + s->buf_size + 1; av_log(s->avctx, AV_LOG_ERROR, "Buffer is too small\n"); return 1; } return 0; } /** * Put n values to buffer * * @param p Pointer to pointer to output buffer * @param n Number of values * @param val Pointer to values * @param type Type of values * @param flip =0 - normal copy, >0 - flip */ static void tnput(uint8_t ** p, int n, const uint8_t * val, enum TiffTypes type, int flip) { int i; #if HAVE_BIGENDIAN flip ^= ((int[]) {0, 0, 0, 1, 3, 3})[type]; #endif for (i = 0; i < n * type_sizes2[type]; i++) *(*p)++ = val[i ^ flip]; } /** * Add entry to directory in tiff header. * @param s Tiff context * @param tag Tag that identifies the entry * @param type Entry type * @param count The number of values * @param ptr_val Pointer to values */ static void add_entry(TiffEncoderContext * s, enum TiffTags tag, enum TiffTypes type, int count, const void *ptr_val) { uint8_t *entries_ptr = s->entries + 12 * s->num_entries; assert(s->num_entries < TIFF_MAX_ENTRY); bytestream_put_le16(&entries_ptr, tag); bytestream_put_le16(&entries_ptr, type); bytestream_put_le32(&entries_ptr, count); if (type_sizes[type] * count <= 4) { tnput(&entries_ptr, count, ptr_val, type, 0); } else { bytestream_put_le32(&entries_ptr, *s->buf - s->buf_start); check_size(s, count * type_sizes2[type]); tnput(s->buf, count, ptr_val, type, 0); } s->num_entries++; } static void add_entry1(TiffEncoderContext * s, enum TiffTags tag, enum TiffTypes type, int val){ uint16_t w = val; uint32_t dw= val; add_entry(s, tag, type, 1, type == TIFF_SHORT ? (void *)&w : (void *)&dw); } /** * Encode one strip in tiff file * * @param s Tiff context * @param src Input buffer * @param dst Output buffer * @param n Size of input buffer * @param compr Compression method * @return Number of output bytes. If an output error is encountered, -1 returned */ static int encode_strip(TiffEncoderContext * s, const int8_t * src, uint8_t * dst, int n, int compr) { switch (compr) { #if CONFIG_ZLIB case TIFF_DEFLATE: case TIFF_ADOBE_DEFLATE: { unsigned long zlen = s->buf_size - (*s->buf - s->buf_start); if (compress(dst, &zlen, src, n) != Z_OK) { av_log(s->avctx, AV_LOG_ERROR, "Compressing failed\n"); return -1; } return zlen; } #endif case TIFF_RAW: if (check_size(s, n)) return -1; memcpy(dst, src, n); return n; case TIFF_PACKBITS: return ff_rle_encode(dst, s->buf_size - (*s->buf - s->buf_start), src, 1, n, 2, 0xff, -1, 0); case TIFF_LZW: return ff_lzw_encode(s->lzws, src, n); default: return -1; } } static void pack_yuv(TiffEncoderContext * s, uint8_t * dst, int lnum) { AVFrame *p = &s->picture; int i, j, k; int w = (s->width - 1) / s->subsampling[0] + 1; uint8_t *pu = &p->data[1][lnum / s->subsampling[1] * p->linesize[1]]; uint8_t *pv = &p->data[2][lnum / s->subsampling[1] * p->linesize[2]]; for (i = 0; i < w; i++){ for (j = 0; j < s->subsampling[1]; j++) for (k = 0; k < s->subsampling[0]; k++) *dst++ = p->data[0][(lnum + j) * p->linesize[0] + i * s->subsampling[0] + k]; *dst++ = *pu++; *dst++ = *pv++; } } static int encode_frame(AVCodecContext * avctx, unsigned char *buf, int buf_size, void *data) { TiffEncoderContext *s = avctx->priv_data; AVFrame *pict = data; AVFrame *const p = (AVFrame *) & s->picture; int i; int n; uint8_t *ptr = buf; uint8_t *offset; uint32_t strips; uint32_t *strip_sizes = NULL; uint32_t *strip_offsets = NULL; int bytes_per_row; uint32_t res[2] = { 72, 1 }; // image resolution (72/1) static const uint16_t bpp_tab[] = { 8, 8, 8, 8 }; int ret = -1; int is_yuv = 0; uint8_t *yuv_line = NULL; int shift_h, shift_v; s->buf_start = buf; s->buf = &ptr; s->buf_size = buf_size; *p = *pict; p->pict_type = AV_PICTURE_TYPE_I; p->key_frame = 1; avctx->coded_frame= &s->picture; s->compr = TIFF_PACKBITS; if (avctx->compression_level == 0) { s->compr = TIFF_RAW; } else if(avctx->compression_level == 2) { s->compr = TIFF_LZW; #if CONFIG_ZLIB } else if ((avctx->compression_level >= 3)) { s->compr = TIFF_DEFLATE; #endif } s->width = avctx->width; s->height = avctx->height; s->subsampling[0] = 1; s->subsampling[1] = 1; switch (avctx->pix_fmt) { case PIX_FMT_RGB24: s->bpp = 24; s->photometric_interpretation = 2; break; case PIX_FMT_GRAY8: s->bpp = 8; s->photometric_interpretation = 1; break; case PIX_FMT_PAL8: s->bpp = 8; s->photometric_interpretation = 3; break; case PIX_FMT_MONOBLACK: s->bpp = 1; s->photometric_interpretation = 1; break; case PIX_FMT_MONOWHITE: s->bpp = 1; s->photometric_interpretation = 0; break; case PIX_FMT_YUV420P: case PIX_FMT_YUV422P: case PIX_FMT_YUV444P: case PIX_FMT_YUV410P: case PIX_FMT_YUV411P: s->photometric_interpretation = 6; avcodec_get_chroma_sub_sample(avctx->pix_fmt, &shift_h, &shift_v); s->bpp = 8 + (16 >> (shift_h + shift_v)); s->subsampling[0] = 1 << shift_h; s->subsampling[1] = 1 << shift_v; s->bpp_tab_size = 3; is_yuv = 1; break; default: av_log(s->avctx, AV_LOG_ERROR, "This colors format is not supported\n"); return -1; } if (!is_yuv) s->bpp_tab_size = (s->bpp >> 3); if (s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE || s->compr == TIFF_LZW) //best choose for DEFLATE s->rps = s->height; else s->rps = FFMAX(8192 / (((s->width * s->bpp) >> 3) + 1), 1); // suggest size of strip s->rps = ((s->rps - 1) / s->subsampling[1] + 1) * s->subsampling[1]; // round rps up strips = (s->height - 1) / s->rps + 1; if (check_size(s, 8)) goto fail; // write header bytestream_put_le16(&ptr, 0x4949); bytestream_put_le16(&ptr, 42); offset = ptr; bytestream_put_le32(&ptr, 0); strip_sizes = av_mallocz(sizeof(*strip_sizes) * strips); strip_offsets = av_mallocz(sizeof(*strip_offsets) * strips); bytes_per_row = (((s->width - 1)/s->subsampling[0] + 1) * s->bpp * s->subsampling[0] * s->subsampling[1] + 7) >> 3; if (is_yuv){ yuv_line = av_malloc(bytes_per_row); if (yuv_line == NULL){ av_log(s->avctx, AV_LOG_ERROR, "Not enough memory\n"); goto fail; } } #if CONFIG_ZLIB if (s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE) { uint8_t *zbuf; int zlen, zn; int j; zlen = bytes_per_row * s->rps; zbuf = av_malloc(zlen); strip_offsets[0] = ptr - buf; zn = 0; for (j = 0; j < s->rps; j++) { if (is_yuv){ pack_yuv(s, yuv_line, j); memcpy(zbuf + zn, yuv_line, bytes_per_row); j += s->subsampling[1] - 1; } else memcpy(zbuf + j * bytes_per_row, p->data[0] + j * p->linesize[0], bytes_per_row); zn += bytes_per_row; } n = encode_strip(s, zbuf, ptr, zn, s->compr); av_free(zbuf); if (n<0) { av_log(s->avctx, AV_LOG_ERROR, "Encode strip failed\n"); goto fail; } ptr += n; strip_sizes[0] = ptr - buf - strip_offsets[0]; } else #endif { if(s->compr == TIFF_LZW) s->lzws = av_malloc(ff_lzw_encode_state_size); for (i = 0; i < s->height; i++) { if (strip_sizes[i / s->rps] == 0) { if(s->compr == TIFF_LZW){ ff_lzw_encode_init(s->lzws, ptr, s->buf_size - (*s->buf - s->buf_start), 12, FF_LZW_TIFF, put_bits); } strip_offsets[i / s->rps] = ptr - buf; } if (is_yuv){ pack_yuv(s, yuv_line, i); n = encode_strip(s, yuv_line, ptr, bytes_per_row, s->compr); i += s->subsampling[1] - 1; } else n = encode_strip(s, p->data[0] + i * p->linesize[0], ptr, bytes_per_row, s->compr); if (n < 0) { av_log(s->avctx, AV_LOG_ERROR, "Encode strip failed\n"); goto fail; } strip_sizes[i / s->rps] += n; ptr += n; if(s->compr == TIFF_LZW && (i==s->height-1 || i%s->rps == s->rps-1)){ int ret; ret = ff_lzw_encode_flush(s->lzws, flush_put_bits); strip_sizes[(i / s->rps )] += ret ; ptr += ret; } } if(s->compr == TIFF_LZW) av_free(s->lzws); } s->num_entries = 0; add_entry1(s,TIFF_SUBFILE, TIFF_LONG, 0); add_entry1(s,TIFF_WIDTH, TIFF_LONG, s->width); add_entry1(s,TIFF_HEIGHT, TIFF_LONG, s->height); if (s->bpp_tab_size) add_entry(s, TIFF_BPP, TIFF_SHORT, s->bpp_tab_size, bpp_tab); add_entry1(s,TIFF_COMPR, TIFF_SHORT, s->compr); add_entry1(s,TIFF_INVERT, TIFF_SHORT, s->photometric_interpretation); add_entry(s, TIFF_STRIP_OFFS, TIFF_LONG, strips, strip_offsets); if (s->bpp_tab_size) add_entry1(s,TIFF_SAMPLES_PER_PIXEL, TIFF_SHORT, s->bpp_tab_size); add_entry1(s,TIFF_ROWSPERSTRIP, TIFF_LONG, s->rps); add_entry(s, TIFF_STRIP_SIZE, TIFF_LONG, strips, strip_sizes); add_entry(s, TIFF_XRES, TIFF_RATIONAL, 1, res); add_entry(s, TIFF_YRES, TIFF_RATIONAL, 1, res); add_entry1(s,TIFF_RES_UNIT, TIFF_SHORT, 2); if(!(avctx->flags & CODEC_FLAG_BITEXACT)) add_entry(s, TIFF_SOFTWARE_NAME, TIFF_STRING, strlen(LIBAVCODEC_IDENT) + 1, LIBAVCODEC_IDENT); if (avctx->pix_fmt == PIX_FMT_PAL8) { uint16_t pal[256 * 3]; for (i = 0; i < 256; i++) { uint32_t rgb = *(uint32_t *) (p->data[1] + i * 4); pal[i] = ((rgb >> 16) & 0xff) * 257; pal[i + 256] = ((rgb >> 8 ) & 0xff) * 257; pal[i + 512] = ( rgb & 0xff) * 257; } add_entry(s, TIFF_PAL, TIFF_SHORT, 256 * 3, pal); } if (is_yuv){ /** according to CCIR Recommendation 601.1 */ uint32_t refbw[12] = {15, 1, 235, 1, 128, 1, 240, 1, 128, 1, 240, 1}; add_entry(s, TIFF_YCBCR_SUBSAMPLING, TIFF_SHORT, 2, s->subsampling); add_entry(s, TIFF_REFERENCE_BW, TIFF_RATIONAL, 6, refbw); } bytestream_put_le32(&offset, ptr - buf); // write offset to dir if (check_size(s, 6 + s->num_entries * 12)) goto fail; bytestream_put_le16(&ptr, s->num_entries); // write tag count bytestream_put_buffer(&ptr, s->entries, s->num_entries * 12); bytestream_put_le32(&ptr, 0); ret = ptr - buf; fail: av_free(strip_sizes); av_free(strip_offsets); av_free(yuv_line); return ret; } AVCodec ff_tiff_encoder = { "tiff", AVMEDIA_TYPE_VIDEO, CODEC_ID_TIFF, sizeof(TiffEncoderContext), NULL, encode_frame, NULL, NULL, 0, NULL, .pix_fmts = (const enum PixelFormat[]) {PIX_FMT_RGB24, PIX_FMT_PAL8, PIX_FMT_GRAY8, PIX_FMT_MONOBLACK, PIX_FMT_MONOWHITE, PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_YUV410P, PIX_FMT_YUV411P, PIX_FMT_NONE}, .long_name = NULL_IF_CONFIG_SMALL("TIFF image"), };