diff options
Diffstat (limited to 'ffmpeg1/libavcodec/pngdec.c')
| -rw-r--r-- | ffmpeg1/libavcodec/pngdec.c | 902 |
1 files changed, 0 insertions, 902 deletions
diff --git a/ffmpeg1/libavcodec/pngdec.c b/ffmpeg1/libavcodec/pngdec.c deleted file mode 100644 index 086f3b4..0000000 --- a/ffmpeg1/libavcodec/pngdec.c +++ /dev/null @@ -1,902 +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 - */ - -//#define DEBUG - -#include "libavutil/bprint.h" -#include "libavutil/imgutils.h" -#include "avcodec.h" -#include "bytestream.h" -#include "internal.h" -#include "png.h" -#include "pngdsp.h" - -/* TODO: - * - add 16 bit depth support - */ - -#include <zlib.h> - -//#define DEBUG - -typedef struct PNGDecContext { - PNGDSPContext dsp; - AVCodecContext *avctx; - - GetByteContext gb; - AVFrame *prev; - - 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 pixels are valid in a pass */ -static const uint8_t png_pass_mask[NB_PASSES] = { - 0x01, 0x01, 0x11, 0x11, 0x55, 0x55, 0xff, -}; - -/* 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, 0xff, 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 = png_pass_mask[pass]; - dsp_mask = png_pass_dsp_mask[pass]; - - switch (bits_per_pixel) { - case 1: - 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] &= 0xFF7F>>j; - dst[x >> 3] |= b << (7 - j); - } - if ((mask << j) & 0x80) - src_x++; - } - break; - case 2: - src_x = 0; - for (x = 0; x < width; x++) { - int j2 = 2 * (x & 3); - j = (x & 7); - if ((dsp_mask << j) & 0x80) { - b = (src[src_x >> 2] >> (6 - 2*(src_x & 3))) & 3; - dst[x >> 2] &= 0xFF3F>>j2; - dst[x >> 2] |= b << (6 - j2); - } - if ((mask << j) & 0x80) - src_x++; - } - break; - case 4: - src_x = 0; - for (x = 0; x < width; x++) { - int j2 = 4*(x&1); - j = (x & 7); - if ((dsp_mask << j) & 0x80) { - b = (src[src_x >> 1] >> (4 - 4*(src_x & 1))) & 15; - dst[x >> 1] &= 0xFF0F>>j2; - dst[x >> 1] |= b << (4 - j2); - } - if ((mask << j) & 0x80) - src_x++; - } - break; - default: - bpp = bits_per_pixel >> 3; - d = dst; - s = src; - 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 - bpp; 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)\ - for (; i < size; i++) {\ - dst[i] = op(dst[i-bpp], src[i], last[i]);\ - }\ - -/* NOTE: 'dst' can be equal to 'last' */ -static void png_filter_row(PNGDSPContext *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 > 2 && 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_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; - } -} - -/* This used to be called "deloco" in FFmpeg - * and is actually an inverse reversible colorspace transformation */ -#define YUV2RGB(NAME, TYPE) \ -static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \ -{ \ - int i; \ - for (i = 0; i < size; i += 3 + alpha) { \ - int g = dst [i+1]; \ - dst[i+0] += g; \ - dst[i+2] += g; \ - } \ -} - -YUV2RGB(rgb8, uint8_t) -YUV2RGB(rgb16, uint16_t) - -/* 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; - 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->y > 0) { - if (s->bit_depth == 16) { - deloco_rgb16((uint16_t *)(ptr - s->image_linesize), s->row_size / 2, - s->color_type == PNG_COLOR_TYPE_RGB_ALPHA); - } else { - deloco_rgb8(ptr - s->image_linesize, s->row_size, - s->color_type == PNG_COLOR_TYPE_RGB_ALPHA); - } - } - s->y++; - if (s->y == s->height) { - s->state |= PNG_ALLIMAGE; - if (s->filter_type == PNG_FILTER_TYPE_LOCO) { - if (s->bit_depth == 16) { - deloco_rgb16((uint16_t *)ptr, s->row_size / 2, - s->color_type == PNG_COLOR_TYPE_RGB_ALPHA); - } else { - deloco_rgb8(ptr, s->row_size, - s->color_type == PNG_COLOR_TYPE_RGB_ALPHA); - } - } - } - } 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) { - 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) { - memset(s->last_row, 0, s->row_size); - 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 = FFMIN(length, bytestream2_get_bytes_left(&s->gb)); - s->zstream.next_in = (unsigned char *)s->gb.buffer; - bytestream2_skip(&s->gb, length); - - /* 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) { - av_log(s->avctx, AV_LOG_ERROR, "inflate returned %d\n", ret); - 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_zbuf(AVBPrint *bp, const uint8_t *data, - const uint8_t *data_end) -{ - z_stream zstream; - unsigned char *buf; - unsigned buf_size; - int ret; - - zstream.zalloc = ff_png_zalloc; - zstream.zfree = ff_png_zfree; - zstream.opaque = NULL; - if (inflateInit(&zstream) != Z_OK) - return AVERROR_EXTERNAL; - zstream.next_in = (unsigned char *)data; - zstream.avail_in = data_end - data; - av_bprint_init(bp, 0, -1); - - while (zstream.avail_in > 0) { - av_bprint_get_buffer(bp, 1, &buf, &buf_size); - if (!buf_size) { - ret = AVERROR(ENOMEM); - goto fail; - } - zstream.next_out = buf; - zstream.avail_out = buf_size; - ret = inflate(&zstream, Z_PARTIAL_FLUSH); - if (ret != Z_OK && ret != Z_STREAM_END) { - ret = AVERROR_EXTERNAL; - goto fail; - } - bp->len += zstream.next_out - buf; - if (ret == Z_STREAM_END) - break; - } - inflateEnd(&zstream); - bp->str[bp->len] = 0; - return 0; - -fail: - inflateEnd(&zstream); - av_bprint_finalize(bp, NULL); - return ret; -} - -static uint8_t *iso88591_to_utf8(const uint8_t *in, size_t size_in) -{ - size_t extra = 0, i; - uint8_t *out, *q; - - for (i = 0; i < size_in; i++) - extra += in[i] >= 0x80; - if (size_in == SIZE_MAX || extra > SIZE_MAX - size_in - 1) - return NULL; - q = out = av_malloc(size_in + extra + 1); - if (!out) - return NULL; - for (i = 0; i < size_in; i++) { - if (in[i] >= 0x80) { - *(q++) = 0xC0 | (in[i] >> 6); - *(q++) = 0x80 | (in[i] & 0x3F); - } else { - *(q++) = in[i]; - } - } - *(q++) = 0; - return out; -} - -static int decode_text_chunk(PNGDecContext *s, uint32_t length, int compressed, - AVDictionary **dict) -{ - int ret, method; - const uint8_t *data = s->gb.buffer; - const uint8_t *data_end = data + length; - const uint8_t *keyword = data; - const uint8_t *keyword_end = memchr(keyword, 0, data_end - keyword); - uint8_t *kw_utf8 = NULL, *text, *txt_utf8 = NULL; - unsigned text_len; - AVBPrint bp; - - if (!keyword_end) - return AVERROR_INVALIDDATA; - data = keyword_end + 1; - - if (compressed) { - if (data == data_end) - return AVERROR_INVALIDDATA; - method = *(data++); - if (method) - return AVERROR_INVALIDDATA; - if ((ret = decode_zbuf(&bp, data, data_end)) < 0) - return ret; - text_len = bp.len; - av_bprint_finalize(&bp, (char **)&text); - if (!text) - return AVERROR(ENOMEM); - } else { - text = (uint8_t *)data; - text_len = data_end - text; - } - - kw_utf8 = iso88591_to_utf8(keyword, keyword_end - keyword); - txt_utf8 = iso88591_to_utf8(text, text_len); - if (text != data) - av_free(text); - if (!(kw_utf8 && txt_utf8)) { - av_free(kw_utf8); - av_free(txt_utf8); - return AVERROR(ENOMEM); - } - - av_dict_set(dict, kw_utf8, txt_utf8, - AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL); - return 0; -} - -static int decode_frame(AVCodecContext *avctx, - void *data, int *got_frame, - AVPacket *avpkt) -{ - PNGDecContext * const s = avctx->priv_data; - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; - AVFrame *p = data; - AVDictionary *metadata = NULL; - uint8_t *crow_buf_base = NULL; - uint32_t tag, length; - int64_t sig; - int ret; - - bytestream2_init(&s->gb, buf, buf_size); - - /* check signature */ - sig = bytestream2_get_be64(&s->gb); - if (sig != PNGSIG && - sig != MNGSIG) { - av_log(avctx, AV_LOG_ERROR, "Missing png signature\n"); - return -1; - } - - s->y = s->state = 0; - - /* 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) { - av_log(avctx, AV_LOG_ERROR, "inflateInit returned %d\n", ret); - return -1; - } - for (;;) { - if (bytestream2_get_bytes_left(&s->gb) <= 0) { - av_log(avctx, AV_LOG_ERROR, "No bytes left\n"); - goto fail; - } - - length = bytestream2_get_be32(&s->gb); - if (length > 0x7fffffff || length > bytestream2_get_bytes_left(&s->gb)) { - av_log(avctx, AV_LOG_ERROR, "chunk too big\n"); - goto fail; - } - tag = bytestream2_get_le32(&s->gb); - if (avctx->debug & FF_DEBUG_STARTCODE) - 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); - switch (tag) { - case MKTAG('I', 'H', 'D', 'R'): - if (length != 13) - goto fail; - s->width = bytestream2_get_be32(&s->gb); - s->height = bytestream2_get_be32(&s->gb); - if (av_image_check_size(s->width, s->height, 0, avctx)) { - s->width = s->height = 0; - av_log(avctx, AV_LOG_ERROR, "Invalid image size\n"); - goto fail; - } - s->bit_depth = bytestream2_get_byte(&s->gb); - s->color_type = bytestream2_get_byte(&s->gb); - s->compression_type = bytestream2_get_byte(&s->gb); - s->filter_type = bytestream2_get_byte(&s->gb); - s->interlace_type = bytestream2_get_byte(&s->gb); - bytestream2_skip(&s->gb, 4); /* crc */ - s->state |= PNG_IHDR; - if (avctx->debug & FF_DEBUG_PICT_INFO) - 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); - break; - case MKTAG('p', 'H', 'Y', 's'): - if (s->state & PNG_IDAT) { - av_log(avctx, AV_LOG_ERROR, "pHYs after IDAT\n"); - goto fail; - } - avctx->sample_aspect_ratio.num = bytestream2_get_be32(&s->gb); - avctx->sample_aspect_ratio.den = bytestream2_get_be32(&s->gb); - if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.den < 0) - avctx->sample_aspect_ratio = (AVRational){ 0, 1 }; - bytestream2_skip(&s->gb, 1); /* unit specifier */ - bytestream2_skip(&s->gb, 4); /* crc */ - break; - case MKTAG('I', 'D', 'A', 'T'): - if (!(s->state & PNG_IHDR)) { - av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n"); - 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 == 2 || s->bit_depth == 4 || s->bit_depth == 8) && - s->color_type == PNG_COLOR_TYPE_RGB) { - avctx->pix_fmt = AV_PIX_FMT_RGB24; - } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) && - s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - avctx->pix_fmt = AV_PIX_FMT_RGBA; - } else if ((s->bit_depth == 2 || s->bit_depth == 4 || s->bit_depth == 8) && - s->color_type == PNG_COLOR_TYPE_GRAY) { - avctx->pix_fmt = AV_PIX_FMT_GRAY8; - } else if (s->bit_depth == 16 && - s->color_type == PNG_COLOR_TYPE_GRAY) { - avctx->pix_fmt = AV_PIX_FMT_GRAY16BE; - } else if (s->bit_depth == 16 && - s->color_type == PNG_COLOR_TYPE_RGB) { - avctx->pix_fmt = AV_PIX_FMT_RGB48BE; - } else if (s->bit_depth == 16 && - s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - avctx->pix_fmt = AV_PIX_FMT_RGBA64BE; - } else if ((s->bits_per_pixel == 1 || s->bits_per_pixel == 2 || s->bits_per_pixel == 4 || s->bits_per_pixel == 8) && - s->color_type == PNG_COLOR_TYPE_PALETTE) { - avctx->pix_fmt = AV_PIX_FMT_PAL8; - } else if (s->bit_depth == 1) { - avctx->pix_fmt = AV_PIX_FMT_MONOBLACK; - } else if (s->bit_depth == 8 && - s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) { - avctx->pix_fmt = AV_PIX_FMT_Y400A; - } else { - av_log(avctx, AV_LOG_ERROR, "unsupported bit depth %d " - "and color type %d\n", - s->bit_depth, s->color_type); - goto fail; - } - - if (ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF) < 0) - goto fail; - p->pict_type = AV_PICTURE_TYPE_I; - 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; - } - av_dlog(avctx, "row_size=%d crow_size =%d\n", - s->row_size, s->crow_size); - s->image_buf = p->data[0]; - s->image_linesize = p->linesize[0]; - /* copy the palette if needed */ - if (avctx->pix_fmt == AV_PIX_FMT_PAL8) - 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 */ - crow_buf_base = av_malloc(s->row_size + 16); - if (!crow_buf_base) - goto fail; - - /* we want crow_buf+1 to be 16-byte aligned */ - s->crow_buf = crow_buf_base + 15; - 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; - bytestream2_skip(&s->gb, 4); /* crc */ - 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 = bytestream2_get_byte(&s->gb); - g = bytestream2_get_byte(&s->gb); - b = bytestream2_get_byte(&s->gb); - s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | b; - } - for (; i < 256; i++) { - s->palette[i] = (0xFFU << 24); - } - s->state |= PNG_PLTE; - bytestream2_skip(&s->gb, 4); /* crc */ - } - 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 = bytestream2_get_byte(&s->gb); - s->palette[i] = (s->palette[i] & 0x00ffffff) | (v << 24); - } - bytestream2_skip(&s->gb, 4); /* crc */ - } - break; - case MKTAG('t', 'E', 'X', 't'): - if (decode_text_chunk(s, length, 0, &metadata) < 0) - av_log(avctx, AV_LOG_WARNING, "Broken tEXt chunk\n"); - bytestream2_skip(&s->gb, length + 4); - break; - case MKTAG('z', 'T', 'X', 't'): - if (decode_text_chunk(s, length, 1, &metadata) < 0) - av_log(avctx, AV_LOG_WARNING, "Broken zTXt chunk\n"); - bytestream2_skip(&s->gb, length + 4); - break; - case MKTAG('I', 'E', 'N', 'D'): - if (!(s->state & PNG_ALLIMAGE)) - av_log(avctx, AV_LOG_ERROR, "IEND without all image\n"); - if (!(s->state & (PNG_ALLIMAGE|PNG_IDAT))) { - goto fail; - } - bytestream2_skip(&s->gb, 4); /* crc */ - goto exit_loop; - default: - /* skip tag */ - skip_tag: - bytestream2_skip(&s->gb, length + 4); - break; - } - } - exit_loop: - - if (s->bits_per_pixel == 1 && s->color_type == PNG_COLOR_TYPE_PALETTE){ - int i, j, k; - uint8_t *pd = p->data[0]; - for (j = 0; j < s->height; j++) { - i = s->width / 8; - for (k = 7; k >= 1; k--) - if ((s->width&7) >= k) - pd[8*i + k - 1] = (pd[i]>>8-k) & 1; - for (i--; i >= 0; i--) { - pd[8*i + 7]= pd[i] & 1; - pd[8*i + 6]= (pd[i]>>1) & 1; - pd[8*i + 5]= (pd[i]>>2) & 1; - pd[8*i + 4]= (pd[i]>>3) & 1; - pd[8*i + 3]= (pd[i]>>4) & 1; - pd[8*i + 2]= (pd[i]>>5) & 1; - pd[8*i + 1]= (pd[i]>>6) & 1; - pd[8*i + 0]= pd[i]>>7; - } - pd += s->image_linesize; - } - } - if (s->bits_per_pixel == 2){ - int i, j; - uint8_t *pd = p->data[0]; - for (j = 0; j < s->height; j++) { - i = s->width / 4; - if (s->color_type == PNG_COLOR_TYPE_PALETTE){ - if ((s->width&3) >= 3) pd[4*i + 2]= (pd[i] >> 2) & 3; - if ((s->width&3) >= 2) pd[4*i + 1]= (pd[i] >> 4) & 3; - if ((s->width&3) >= 1) pd[4*i + 0]= pd[i] >> 6; - for (i--; i >= 0; i--) { - pd[4*i + 3]= pd[i] & 3; - pd[4*i + 2]= (pd[i]>>2) & 3; - pd[4*i + 1]= (pd[i]>>4) & 3; - pd[4*i + 0]= pd[i]>>6; - } - } else { - if ((s->width&3) >= 3) pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55; - if ((s->width&3) >= 2) pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55; - if ((s->width&3) >= 1) pd[4*i + 0]= ( pd[i]>>6 )*0x55; - for (i--; i >= 0; i--) { - pd[4*i + 3]= ( pd[i] & 3)*0x55; - pd[4*i + 2]= ((pd[i]>>2) & 3)*0x55; - pd[4*i + 1]= ((pd[i]>>4) & 3)*0x55; - pd[4*i + 0]= ( pd[i]>>6 )*0x55; - } - } - pd += s->image_linesize; - } - } - if (s->bits_per_pixel == 4){ - int i, j; - uint8_t *pd = p->data[0]; - for (j = 0; j < s->height; j++) { - i = s->width/2; - if (s->color_type == PNG_COLOR_TYPE_PALETTE){ - if (s->width&1) pd[2*i+0]= pd[i]>>4; - for (i--; i >= 0; i--) { - pd[2*i + 1] = pd[i] & 15; - pd[2*i + 0] = pd[i] >> 4; - } - } else { - if (s->width & 1) pd[2*i + 0]= (pd[i] >> 4) * 0x11; - for (i--; i >= 0; i--) { - pd[2*i + 1] = (pd[i] & 15) * 0x11; - pd[2*i + 0] = (pd[i] >> 4) * 0x11; - } - } - pd += s->image_linesize; - } - } - - /* handle p-frames only if a predecessor frame is available */ - if (s->prev->data[0]) { - if ( !(avpkt->flags & AV_PKT_FLAG_KEY) - && s->prev->width == p->width - && s->prev->height== p->height - && s->prev->format== p->format - ) { - int i, j; - uint8_t *pd = p->data[0]; - uint8_t *pd_last = s->prev->data[0]; - - for (j = 0; j < s->height; j++) { - for (i = 0; i < s->width * s->bpp; i++) { - pd[i] += pd_last[i]; - } - pd += s->image_linesize; - pd_last += s->image_linesize; - } - } - } - - av_frame_set_metadata(p, metadata); - metadata = NULL; - - av_frame_unref(s->prev); - if ((ret = av_frame_ref(s->prev, p)) < 0) - goto fail; - - *got_frame = 1; - - ret = bytestream2_tell(&s->gb); - the_end: - inflateEnd(&s->zstream); - av_free(crow_buf_base); - s->crow_buf = NULL; - av_freep(&s->last_row); - av_freep(&s->tmp_row); - return ret; - fail: - av_dict_free(&metadata); - ret = -1; - goto the_end; -} - -static av_cold int png_dec_init(AVCodecContext *avctx) -{ - PNGDecContext *s = avctx->priv_data; - - s->prev = av_frame_alloc(); - if (!s->prev) - return AVERROR(ENOMEM); - - ff_pngdsp_init(&s->dsp); - - s->avctx = avctx; - - return 0; -} - -static av_cold int png_dec_end(AVCodecContext *avctx) -{ - PNGDecContext *s = avctx->priv_data; - - av_frame_free(&s->prev); - - return 0; -} - -AVCodec ff_png_decoder = { - .name = "png", - .type = AVMEDIA_TYPE_VIDEO, - .id = AV_CODEC_ID_PNG, - .priv_data_size = sizeof(PNGDecContext), - .init = png_dec_init, - .close = png_dec_end, - .decode = decode_frame, - .capabilities = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/, - .long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"), -}; |