| /* |
| * 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" |
| #include "thread.h" |
| |
| #include <zlib.h> |
| |
| typedef struct PNGDecContext { |
| PNGDSPContext dsp; |
| AVCodecContext *avctx; |
| |
| GetByteContext gb; |
| ThreadFrame last_picture; |
| ThreadFrame 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; |
| unsigned int last_row_size; |
| uint8_t *tmp_row; |
| unsigned int tmp_row_size; |
| uint8_t *buffer; |
| int buffer_size; |
| 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) { |
| unsigned 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); |
| FFSWAP(unsigned int, s->last_row_size, s->tmp_row_size); |
| 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 error %d\n", ret); |
| return AVERROR_EXTERNAL; |
| } |
| 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; |
| } |
| if (ret == Z_STREAM_END && s->zstream.avail_in > 0) { |
| av_log(NULL, AV_LOG_WARNING, |
| "%d undecompressed bytes left in buffer\n", s->zstream.avail_in); |
| return 0; |
| } |
| } |
| 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; |
| AVDictionary *metadata = NULL; |
| uint32_t tag, length; |
| int64_t sig; |
| int ret; |
| |
| ff_thread_release_buffer(avctx, &s->last_picture); |
| FFSWAP(ThreadFrame, s->picture, s->last_picture); |
| p = s->picture.f; |
| |
| 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 AVERROR_INVALIDDATA; |
| } |
| |
| 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 error %d\n", ret); |
| return AVERROR_EXTERNAL; |
| } |
| for (;;) { |
| if (bytestream2_get_bytes_left(&s->gb) <= 0) { |
| av_log(avctx, AV_LOG_ERROR, "%d bytes left\n", bytestream2_get_bytes_left(&s->gb)); |
| if ( s->state & PNG_ALLIMAGE |
| && avctx->strict_std_compliance <= FF_COMPLIANCE_NORMAL) |
| goto exit_loop; |
| 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; |
| |
| if (s->state & PNG_IDAT) { |
| av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n"); |
| goto fail; |
| } |
| |
| if (s->state & PNG_IHDR) { |
| av_log(avctx, AV_LOG_ERROR, "Multiple IHDR\n"); |
| 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 && s->bits_per_pixel == 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_YA8; |
| } else if (s->bit_depth == 16 && |
| s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) { |
| avctx->pix_fmt = AV_PIX_FMT_YA16BE; |
| } 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_thread_get_buffer(avctx, &s->picture, AV_GET_BUFFER_FLAG_REF) < 0) |
| goto fail; |
| ff_thread_finish_setup(avctx); |
| |
| 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 */ |
| av_fast_padded_mallocz(&s->last_row, &s->last_row_size, s->row_size); |
| if (!s->last_row) |
| goto fail; |
| if (s->interlace_type || |
| s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { |
| av_fast_padded_malloc(&s->tmp_row, &s->tmp_row_size, s->row_size); |
| if (!s->tmp_row) |
| goto fail; |
| } |
| /* compressed row */ |
| av_fast_padded_malloc(&s->buffer, &s->buffer_size, s->row_size + 16); |
| if (!s->buffer) |
| goto fail; |
| |
| /* we want crow_buf+1 to be 16-byte aligned */ |
| s->crow_buf = s->buffer + 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->last_picture.f->data[0]) { |
| if ( !(avpkt->flags & AV_PKT_FLAG_KEY) && avctx->codec_tag != AV_RL32("MPNG") |
| && s->last_picture.f->width == p->width |
| && s->last_picture.f->height== p->height |
| && s->last_picture.f->format== p->format |
| ) { |
| int i, j; |
| uint8_t *pd = p->data[0]; |
| uint8_t *pd_last = s->last_picture.f->data[0]; |
| int ls = FFMIN(av_image_get_linesize(p->format, s->width, 0), s->width * s->bpp); |
| |
| ff_thread_await_progress(&s->last_picture, INT_MAX, 0); |
| for (j = 0; j < s->height; j++) { |
| for (i = 0; i < ls; i++) |
| pd[i] += pd_last[i]; |
| pd += s->image_linesize; |
| pd_last += s->image_linesize; |
| } |
| } |
| } |
| ff_thread_report_progress(&s->picture, INT_MAX, 0); |
| |
| av_frame_set_metadata(p, metadata); |
| metadata = NULL; |
| |
| if ((ret = av_frame_ref(data, s->picture.f)) < 0) |
| return ret; |
| |
| *got_frame = 1; |
| |
| ret = bytestream2_tell(&s->gb); |
| the_end: |
| inflateEnd(&s->zstream); |
| s->crow_buf = NULL; |
| return ret; |
| fail: |
| av_dict_free(&metadata); |
| ff_thread_report_progress(&s->picture, INT_MAX, 0); |
| ret = AVERROR_INVALIDDATA; |
| goto the_end; |
| } |
| |
| static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src) |
| { |
| PNGDecContext *psrc = src->priv_data; |
| PNGDecContext *pdst = dst->priv_data; |
| |
| if (dst == src) |
| return 0; |
| |
| ff_thread_release_buffer(dst, &pdst->picture); |
| if (psrc->picture.f->data[0]) |
| return ff_thread_ref_frame(&pdst->picture, &psrc->picture); |
| |
| return 0; |
| } |
| |
| static av_cold int png_dec_init(AVCodecContext *avctx) |
| { |
| PNGDecContext *s = avctx->priv_data; |
| |
| avctx->color_range = AVCOL_RANGE_JPEG; |
| s->avctx = avctx; |
| s->last_picture.f = av_frame_alloc(); |
| s->picture.f = av_frame_alloc(); |
| if (!s->last_picture.f || !s->picture.f) |
| return AVERROR(ENOMEM); |
| |
| if (!avctx->internal->is_copy) { |
| avctx->internal->allocate_progress = 1; |
| ff_pngdsp_init(&s->dsp); |
| } |
| |
| return 0; |
| } |
| |
| static av_cold int png_dec_end(AVCodecContext *avctx) |
| { |
| PNGDecContext *s = avctx->priv_data; |
| |
| ff_thread_release_buffer(avctx, &s->last_picture); |
| av_frame_free(&s->last_picture.f); |
| ff_thread_release_buffer(avctx, &s->picture); |
| av_frame_free(&s->picture.f); |
| av_freep(&s->buffer); |
| s->buffer_size = 0; |
| av_freep(&s->last_row); |
| s->last_row_size = 0; |
| av_freep(&s->tmp_row); |
| s->tmp_row_size = 0; |
| |
| return 0; |
| } |
| |
| AVCodec ff_png_decoder = { |
| .name = "png", |
| .long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"), |
| .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, |
| .init_thread_copy = ONLY_IF_THREADS_ENABLED(png_dec_init), |
| .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context), |
| .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS /*| CODEC_CAP_DRAW_HORIZ_BAND*/, |
| }; |