diff options
Diffstat (limited to 'contrib/ffmpeg/libavcodec/pngdec.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/pngdec.c | 621 |
1 files changed, 0 insertions, 621 deletions
diff --git a/contrib/ffmpeg/libavcodec/pngdec.c b/contrib/ffmpeg/libavcodec/pngdec.c deleted file mode 100644 index 90dac4dfa..000000000 --- a/contrib/ffmpeg/libavcodec/pngdec.c +++ /dev/null @@ -1,621 +0,0 @@ -/* - * PNG image format - * Copyright (c) 2003 Fabrice Bellard. - * - * 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 "avcodec.h" -#include "bytestream.h" -#include "png.h" -#include "dsputil.h" - -/* TODO: - * - add 2, 4 and 16 bit depth support - */ - -#include <zlib.h> - -//#define DEBUG - -typedef struct PNGDecContext { - DSPContext dsp; - - const uint8_t *bytestream; - const uint8_t *bytestream_start; - const uint8_t *bytestream_end; - AVFrame picture; - - int state; - int width, height; - int bit_depth; - int color_type; - int compression_type; - int interlace_type; - int filter_type; - int channels; - int bits_per_pixel; - int bpp; - - uint8_t *image_buf; - int image_linesize; - uint32_t palette[256]; - uint8_t *crow_buf; - uint8_t *last_row; - uint8_t *tmp_row; - int pass; - int crow_size; /* compressed row size (include filter type) */ - int row_size; /* decompressed row size */ - int pass_row_size; /* decompress row size of the current pass */ - int y; - z_stream zstream; -} PNGDecContext; - -/* Mask to determine which y pixels can be written in a pass */ -static const uint8_t png_pass_dsp_ymask[NB_PASSES] = { - 0xff, 0xff, 0x0f, 0xcc, 0x33, 0xff, 0x55, -}; - -/* Mask to determine which pixels to overwrite while displaying */ -static const uint8_t png_pass_dsp_mask[NB_PASSES] = { - 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff -}; - -/* NOTE: we try to construct a good looking image at each pass. width - is the original image width. We also do pixel format conversion at - this stage */ -static void png_put_interlaced_row(uint8_t *dst, int width, - int bits_per_pixel, int pass, - int color_type, const uint8_t *src) -{ - int x, mask, dsp_mask, j, src_x, b, bpp; - uint8_t *d; - const uint8_t *s; - - mask = ff_png_pass_mask[pass]; - dsp_mask = png_pass_dsp_mask[pass]; - switch(bits_per_pixel) { - case 1: - /* we must initialize the line to zero before writing to it */ - if (pass == 0) - memset(dst, 0, (width + 7) >> 3); - src_x = 0; - for(x = 0; x < width; x++) { - j = (x & 7); - if ((dsp_mask << j) & 0x80) { - b = (src[src_x >> 3] >> (7 - (src_x & 7))) & 1; - dst[x >> 3] |= b << (7 - j); - } - if ((mask << j) & 0x80) - src_x++; - } - break; - default: - bpp = bits_per_pixel >> 3; - d = dst; - s = src; - if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - for(x = 0; x < width; x++) { - j = x & 7; - if ((dsp_mask << j) & 0x80) { - *(uint32_t *)d = (s[3] << 24) | (s[0] << 16) | (s[1] << 8) | s[2]; - } - d += bpp; - if ((mask << j) & 0x80) - s += bpp; - } - } else { - for(x = 0; x < width; x++) { - j = x & 7; - if ((dsp_mask << j) & 0x80) { - memcpy(d, s, bpp); - } - d += bpp; - if ((mask << j) & 0x80) - s += bpp; - } - } - break; - } -} - -void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp) -{ - int i; - for(i = 0; i < w; i++) { - int a, b, c, p, pa, pb, pc; - - a = dst[i - bpp]; - b = top[i]; - c = top[i - bpp]; - - p = b - c; - pc = a - c; - - pa = abs(p); - pb = abs(pc); - pc = abs(p + pc); - - if (pa <= pb && pa <= pc) - p = a; - else if (pb <= pc) - p = b; - else - p = c; - dst[i] = p + src[i]; - } -} - -#define UNROLL1(bpp, op) {\ - r = dst[0];\ - if(bpp >= 2) g = dst[1];\ - if(bpp >= 3) b = dst[2];\ - if(bpp >= 4) a = dst[3];\ - for(; i < size; i+=bpp) {\ - dst[i+0] = r = op(r, src[i+0], last[i+0]);\ - if(bpp == 1) continue;\ - dst[i+1] = g = op(g, src[i+1], last[i+1]);\ - if(bpp == 2) continue;\ - dst[i+2] = b = op(b, src[i+2], last[i+2]);\ - if(bpp == 3) continue;\ - dst[i+3] = a = op(a, src[i+3], last[i+3]);\ - }\ -} - -#define UNROLL_FILTER(op)\ - if(bpp == 1) UNROLL1(1, op)\ - else if(bpp == 2) UNROLL1(2, op)\ - else if(bpp == 3) UNROLL1(3, op)\ - else if(bpp == 4) UNROLL1(4, op)\ - -/* NOTE: 'dst' can be equal to 'last' */ -static void png_filter_row(DSPContext *dsp, uint8_t *dst, int filter_type, - uint8_t *src, uint8_t *last, int size, int bpp) -{ - int i, p, r, g, b, a; - - switch(filter_type) { - case PNG_FILTER_VALUE_NONE: - memcpy(dst, src, size); - break; - case PNG_FILTER_VALUE_SUB: - for(i = 0; i < bpp; i++) { - dst[i] = src[i]; - } - if(bpp == 4) { - p = *(int*)dst; - for(; i < size; i+=bpp) { - int s = *(int*)(src+i); - p = ((s&0x7f7f7f7f) + (p&0x7f7f7f7f)) ^ ((s^p)&0x80808080); - *(int*)(dst+i) = p; - } - } else { -#define OP_SUB(x,s,l) x+s - UNROLL_FILTER(OP_SUB); - } - break; - case PNG_FILTER_VALUE_UP: - dsp->add_bytes_l2(dst, src, last, size); - break; - case PNG_FILTER_VALUE_AVG: - for(i = 0; i < bpp; i++) { - p = (last[i] >> 1); - dst[i] = p + src[i]; - } -#define OP_AVG(x,s,l) (((x + l) >> 1) + s) & 0xff - UNROLL_FILTER(OP_AVG); - break; - case PNG_FILTER_VALUE_PAETH: - for(i = 0; i < bpp; i++) { - p = last[i]; - dst[i] = p + src[i]; - } - if(bpp > 1 && size > 4) { - // would write off the end of the array if we let it process the last pixel with bpp=3 - int w = bpp==4 ? size : size-3; - dsp->add_png_paeth_prediction(dst+i, src+i, last+i, w-i, bpp); - i = w; - } - ff_add_png_paeth_prediction(dst+i, src+i, last+i, size-i, bpp); - break; - } -} - -static av_always_inline void convert_to_rgb32_loco(uint8_t *dst, const uint8_t *src, int width, int loco) -{ - int j; - unsigned int r, g, b, a; - - for(j = 0;j < width; j++) { - r = src[0]; - g = src[1]; - b = src[2]; - a = src[3]; - if(loco) { - r = (r+g)&0xff; - b = (b+g)&0xff; - } - *(uint32_t *)dst = (a << 24) | (r << 16) | (g << 8) | b; - dst += 4; - src += 4; - } -} - -static void convert_to_rgb32(uint8_t *dst, const uint8_t *src, int width, int loco) -{ - if(loco) - convert_to_rgb32_loco(dst, src, width, 1); - else - convert_to_rgb32_loco(dst, src, width, 0); -} - -static void deloco_rgb24(uint8_t *dst, int size) -{ - int i; - for(i=0; i<size; i+=3) { - int g = dst[i+1]; - dst[i+0] += g; - dst[i+2] += g; - } -} - -/* process exactly one decompressed row */ -static void png_handle_row(PNGDecContext *s) -{ - uint8_t *ptr, *last_row; - int got_line; - - if (!s->interlace_type) { - ptr = s->image_buf + s->image_linesize * s->y; - /* need to swap bytes correctly for RGB_ALPHA */ - if (s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1, - s->last_row, s->row_size, s->bpp); - convert_to_rgb32(ptr, s->tmp_row, s->width, s->filter_type == PNG_FILTER_TYPE_LOCO); - FFSWAP(uint8_t*, s->last_row, s->tmp_row); - } else { - /* in normal case, we avoid one copy */ - if (s->y == 0) - last_row = s->last_row; - else - last_row = ptr - s->image_linesize; - - png_filter_row(&s->dsp, ptr, s->crow_buf[0], s->crow_buf + 1, - last_row, s->row_size, s->bpp); - } - /* loco lags by 1 row so that it doesn't interfere with top prediction */ - if (s->filter_type == PNG_FILTER_TYPE_LOCO && - s->color_type == PNG_COLOR_TYPE_RGB && s->y > 0) - deloco_rgb24(ptr - s->image_linesize, s->row_size); - s->y++; - if (s->y == s->height) { - s->state |= PNG_ALLIMAGE; - if (s->filter_type == PNG_FILTER_TYPE_LOCO && - s->color_type == PNG_COLOR_TYPE_RGB) - deloco_rgb24(ptr, s->row_size); - } - } else { - got_line = 0; - for(;;) { - ptr = s->image_buf + s->image_linesize * s->y; - if ((ff_png_pass_ymask[s->pass] << (s->y & 7)) & 0x80) { - /* if we already read one row, it is time to stop to - wait for the next one */ - if (got_line) - break; - png_filter_row(&s->dsp, s->tmp_row, s->crow_buf[0], s->crow_buf + 1, - s->last_row, s->pass_row_size, s->bpp); - FFSWAP(uint8_t*, s->last_row, s->tmp_row); - got_line = 1; - } - if ((png_pass_dsp_ymask[s->pass] << (s->y & 7)) & 0x80) { - /* NOTE: RGB32 is handled directly in png_put_interlaced_row */ - png_put_interlaced_row(ptr, s->width, s->bits_per_pixel, s->pass, - s->color_type, s->last_row); - } - s->y++; - if (s->y == s->height) { - for(;;) { - if (s->pass == NB_PASSES - 1) { - s->state |= PNG_ALLIMAGE; - goto the_end; - } else { - s->pass++; - s->y = 0; - s->pass_row_size = ff_png_pass_row_size(s->pass, - s->bits_per_pixel, - s->width); - s->crow_size = s->pass_row_size + 1; - if (s->pass_row_size != 0) - break; - /* skip pass if empty row */ - } - } - } - } - the_end: ; - } -} - -static int png_decode_idat(PNGDecContext *s, int length) -{ - int ret; - s->zstream.avail_in = length; - s->zstream.next_in = s->bytestream; - s->bytestream += length; - - if(s->bytestream > s->bytestream_end) - return -1; - - /* decode one line if possible */ - while (s->zstream.avail_in > 0) { - ret = inflate(&s->zstream, Z_PARTIAL_FLUSH); - if (ret != Z_OK && ret != Z_STREAM_END) { - return -1; - } - if (s->zstream.avail_out == 0) { - if (!(s->state & PNG_ALLIMAGE)) { - png_handle_row(s); - } - s->zstream.avail_out = s->crow_size; - s->zstream.next_out = s->crow_buf; - } - } - return 0; -} - -static int decode_frame(AVCodecContext *avctx, - void *data, int *data_size, - const uint8_t *buf, int buf_size) -{ - PNGDecContext * const s = avctx->priv_data; - AVFrame *picture = data; - AVFrame * const p= (AVFrame*)&s->picture; - uint32_t tag, length; - int ret, crc; - - s->bytestream_start= - s->bytestream= buf; - s->bytestream_end= buf + buf_size; - - /* check signature */ - if (memcmp(s->bytestream, ff_pngsig, 8) != 0 && - memcmp(s->bytestream, ff_mngsig, 8) != 0) - return -1; - s->bytestream+= 8; - s->y= - s->state=0; -// memset(s, 0, sizeof(PNGDecContext)); - /* init the zlib */ - s->zstream.zalloc = ff_png_zalloc; - s->zstream.zfree = ff_png_zfree; - s->zstream.opaque = NULL; - ret = inflateInit(&s->zstream); - if (ret != Z_OK) - return -1; - for(;;) { - int tag32; - if (s->bytestream >= s->bytestream_end) - goto fail; - length = bytestream_get_be32(&s->bytestream); - if (length > 0x7fffffff) - goto fail; - tag32 = bytestream_get_be32(&s->bytestream); - tag = bswap_32(tag32); -#ifdef DEBUG - av_log(avctx, AV_LOG_DEBUG, "png: tag=%c%c%c%c length=%u\n", - (tag & 0xff), - ((tag >> 8) & 0xff), - ((tag >> 16) & 0xff), - ((tag >> 24) & 0xff), length); -#endif - switch(tag) { - case MKTAG('I', 'H', 'D', 'R'): - if (length != 13) - goto fail; - s->width = bytestream_get_be32(&s->bytestream); - s->height = bytestream_get_be32(&s->bytestream); - if(avcodec_check_dimensions(avctx, s->width, s->height)){ - s->width= s->height= 0; - goto fail; - } - s->bit_depth = *s->bytestream++; - s->color_type = *s->bytestream++; - s->compression_type = *s->bytestream++; - s->filter_type = *s->bytestream++; - s->interlace_type = *s->bytestream++; - crc = bytestream_get_be32(&s->bytestream); - s->state |= PNG_IHDR; -#ifdef DEBUG - av_log(avctx, AV_LOG_DEBUG, "width=%d height=%d depth=%d color_type=%d compression_type=%d filter_type=%d interlace_type=%d\n", - s->width, s->height, s->bit_depth, s->color_type, - s->compression_type, s->filter_type, s->interlace_type); -#endif - break; - case MKTAG('I', 'D', 'A', 'T'): - if (!(s->state & PNG_IHDR)) - goto fail; - if (!(s->state & PNG_IDAT)) { - /* init image info */ - avctx->width = s->width; - avctx->height = s->height; - - s->channels = ff_png_get_nb_channels(s->color_type); - s->bits_per_pixel = s->bit_depth * s->channels; - s->bpp = (s->bits_per_pixel + 7) >> 3; - s->row_size = (avctx->width * s->bits_per_pixel + 7) >> 3; - - if (s->bit_depth == 8 && - s->color_type == PNG_COLOR_TYPE_RGB) { - avctx->pix_fmt = PIX_FMT_RGB24; - } else if (s->bit_depth == 8 && - s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - avctx->pix_fmt = PIX_FMT_RGB32; - } else if (s->bit_depth == 8 && - s->color_type == PNG_COLOR_TYPE_GRAY) { - avctx->pix_fmt = PIX_FMT_GRAY8; - } else if (s->bit_depth == 16 && - s->color_type == PNG_COLOR_TYPE_GRAY) { - avctx->pix_fmt = PIX_FMT_GRAY16BE; - } else if (s->bit_depth == 1 && - s->color_type == PNG_COLOR_TYPE_GRAY) { - avctx->pix_fmt = PIX_FMT_MONOBLACK; - } else if (s->color_type == PNG_COLOR_TYPE_PALETTE) { - avctx->pix_fmt = PIX_FMT_PAL8; - } else { - goto fail; - } - if(p->data[0]) - avctx->release_buffer(avctx, p); - - p->reference= 0; - if(avctx->get_buffer(avctx, p) < 0){ - av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); - goto fail; - } - p->pict_type= FF_I_TYPE; - p->key_frame= 1; - p->interlaced_frame = !!s->interlace_type; - - /* compute the compressed row size */ - if (!s->interlace_type) { - s->crow_size = s->row_size + 1; - } else { - s->pass = 0; - s->pass_row_size = ff_png_pass_row_size(s->pass, - s->bits_per_pixel, - s->width); - s->crow_size = s->pass_row_size + 1; - } -#ifdef DEBUG - av_log(avctx, AV_LOG_DEBUG, "row_size=%d crow_size =%d\n", - s->row_size, s->crow_size); -#endif - s->image_buf = p->data[0]; - s->image_linesize = p->linesize[0]; - /* copy the palette if needed */ - if (s->color_type == PNG_COLOR_TYPE_PALETTE) - memcpy(p->data[1], s->palette, 256 * sizeof(uint32_t)); - /* empty row is used if differencing to the first row */ - s->last_row = av_mallocz(s->row_size); - if (!s->last_row) - goto fail; - if (s->interlace_type || - s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - s->tmp_row = av_malloc(s->row_size); - if (!s->tmp_row) - goto fail; - } - /* compressed row */ - s->crow_buf = av_malloc(s->row_size + 1); - if (!s->crow_buf) - goto fail; - s->zstream.avail_out = s->crow_size; - s->zstream.next_out = s->crow_buf; - } - s->state |= PNG_IDAT; - if (png_decode_idat(s, length) < 0) - goto fail; - /* skip crc */ - crc = bytestream_get_be32(&s->bytestream); - break; - case MKTAG('P', 'L', 'T', 'E'): - { - int n, i, r, g, b; - - if ((length % 3) != 0 || length > 256 * 3) - goto skip_tag; - /* read the palette */ - n = length / 3; - for(i=0;i<n;i++) { - r = *s->bytestream++; - g = *s->bytestream++; - b = *s->bytestream++; - s->palette[i] = (0xff << 24) | (r << 16) | (g << 8) | b; - } - for(;i<256;i++) { - s->palette[i] = (0xff << 24); - } - s->state |= PNG_PLTE; - crc = bytestream_get_be32(&s->bytestream); - } - break; - case MKTAG('t', 'R', 'N', 'S'): - { - int v, i; - - /* read the transparency. XXX: Only palette mode supported */ - if (s->color_type != PNG_COLOR_TYPE_PALETTE || - length > 256 || - !(s->state & PNG_PLTE)) - goto skip_tag; - for(i=0;i<length;i++) { - v = *s->bytestream++; - s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24); - } - crc = bytestream_get_be32(&s->bytestream); - } - break; - case MKTAG('I', 'E', 'N', 'D'): - if (!(s->state & PNG_ALLIMAGE)) - goto fail; - crc = bytestream_get_be32(&s->bytestream); - goto exit_loop; - default: - /* skip tag */ - skip_tag: - s->bytestream += length + 4; - break; - } - } - exit_loop: - *picture= *(AVFrame*)&s->picture; - *data_size = sizeof(AVPicture); - - ret = s->bytestream - s->bytestream_start; - the_end: - inflateEnd(&s->zstream); - av_freep(&s->crow_buf); - av_freep(&s->last_row); - av_freep(&s->tmp_row); - return ret; - fail: - ret = -1; - goto the_end; -} - -static int png_dec_init(AVCodecContext *avctx){ - PNGDecContext *s = avctx->priv_data; - - avcodec_get_frame_defaults((AVFrame*)&s->picture); - avctx->coded_frame= (AVFrame*)&s->picture; - dsputil_init(&s->dsp, avctx); - - return 0; -} - -AVCodec png_decoder = { - "png", - CODEC_TYPE_VIDEO, - CODEC_ID_PNG, - sizeof(PNGDecContext), - png_dec_init, - NULL, - NULL, //decode_end, - decode_frame, - 0 /*CODEC_CAP_DR1*/ /*| CODEC_CAP_DRAW_HORIZ_BAND*/, - NULL -}; |