tiffenc.c

ffmpeg移植到symbian的全部源代码

/*
 * TIFF image encoder
 * Copyright (c) 2007 Bartlomiej Wolowiec
 *
 * 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
 */

/**
 * TIFF image encoder
 * @file tiffenc.c
 * @author Bartlomiej Wolowiec
 */
#include "avcodec.h"
#ifdef CONFIG_ZLIB
#include <zlib.h>
#endif
#include "bytestream.h"
#include "tiff.h"
#include "rle.h"
#include "lzw.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;
#ifdef WORDS_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) {
#ifdef CONFIG_ZLIB
    case TIFF_DEFLATE:
    case TIFF_ADOBE_DEFLATE:
        {
            unsigned long zlen = s->buf_size - (*s->buf - s->buf_start);
#ifdef __CW32__
            if (compress(dst, &zlen, (const unsigned char*)src, n) != Z_OK) {
#else
            if (compress(dst, &zlen, src, n) != Z_OK) {
#endif
                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:
#ifdef __CW32__
        return ff_rle_encode(dst, s->buf_size - (*s->buf - s->buf_start), (const unsigned char*)src, 1, n, 2, 0xff, -1, 0);
#else
        return ff_rle_encode(dst, s->buf_size - (*s->buf - s->buf_start), src, 1, n, 2, 0xff, -1, 0);
#endif
    case TIFF_LZW:
#ifdef __CW32__
        return ff_lzw_encode(s->lzws, (const unsigned char*)src, n);
#else
        return ff_lzw_encode(s->lzws, src, n);
#endif
    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 = FF_I_TYPE;
    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;
#ifdef CONFIG_ZLIB
    } else if ((avctx->compression_level >= 3)) {
        s->compr = TIFF_DEFLATE;
#endif
    }

    s->width = avctx->width;