diff options
Diffstat (limited to 'libavcodec/pngdec.c')
| -rw-r--r-- | libavcodec/pngdec.c | 1235 |
1 files changed, 934 insertions, 301 deletions
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index dec5bd512c..901abaebd3 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -2,43 +2,51 @@ * PNG image format * Copyright (c) 2003 Fabrice Bellard * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * 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 "apng.h" #include "png.h" #include "pngdsp.h" - -/* TODO: - * - add 2, 4 and 16 bit depth support - */ +#include "thread.h" #include <zlib.h> typedef struct PNGDecContext { PNGDSPContext dsp; + AVCodecContext *avctx; GetByteContext gb; - AVFrame *prev; + ThreadFrame previous_picture; + ThreadFrame last_picture; + ThreadFrame picture; int state; int width, height; + int cur_w, cur_h; + int x_offset, y_offset; + uint8_t dispose_op, blend_op; int bit_depth; int color_type; int compression_type; @@ -48,12 +56,17 @@ typedef struct PNGDecContext { int bits_per_pixel; int bpp; + int frame_id; 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 */ @@ -62,9 +75,14 @@ typedef struct PNGDecContext { 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, 0xcc, 0x33, 0xff, 0x55, + 0xff, 0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, }; /* Mask to determine which pixels to overwrite while displaying */ @@ -83,40 +101,55 @@ static void png_put_interlaced_row(uint8_t *dst, int width, uint8_t *d; const uint8_t *s; - mask = ff_png_pass_mask[pass]; + mask = 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] &= 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; - 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) { @@ -126,7 +159,6 @@ static void png_put_interlaced_row(uint8_t *dst, int width, if ((mask << j) & 0x80) s += bpp; } - } break; } } @@ -168,7 +200,7 @@ void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, b = dst[2]; \ if (bpp >= 4) \ a = dst[3]; \ - for (; i < size; i += bpp) { \ + for (; i <= size - bpp; i += bpp) { \ dst[i + 0] = r = op(r, src[i + 0], last[i + 0]); \ if (bpp == 1) \ continue; \ @@ -191,12 +223,9 @@ void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, UNROLL1(3, op) \ } else if (bpp == 4) { \ UNROLL1(4, op) \ - } else { \ - for (; i < size; i += bpp) { \ - int j; \ - for (j = 0; j < bpp; j++) \ - dst[i + j] = op(dst[i + j - bpp], src[i + j], last[i + j]); \ - } \ + } \ + for (; i < size; i++) { \ + dst[i] = op(dst[i - bpp], src[i], last[i]); \ } /* NOTE: 'dst' can be equal to 'last' */ @@ -215,12 +244,12 @@ static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type, if (bpp == 4) { p = *(int *)dst; for (; i < size; i += bpp) { - int s = *(int *)(src + i); + 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 +#define OP_SUB(x, s, l) ((x) + (s)) UNROLL_FILTER(OP_SUB); } break; @@ -232,7 +261,7 @@ static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type, p = (last[i] >> 1); dst[i] = p + src[i]; } -#define OP_AVG(x, s, l) (((x + l) >> 1) + s) & 0xff +#define OP_AVG(x, s, l) (((((x) + (l)) >> 1) + (s)) & 0xff) UNROLL_FILTER(OP_AVG); break; case PNG_FILTER_VALUE_PAETH: @@ -243,55 +272,33 @@ static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type, 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; + int w = (bpp & 3) ? size - 3 : size; + + if (w > i) { + dsp->add_paeth_prediction(dst + i, src + i, last + i, size - 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; - } +/* 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; \ + } \ } -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; - } -} +YUV2RGB(rgb8, uint8_t) +YUV2RGB(rgb16, uint16_t) /* process exactly one decompressed row */ static void png_handle_row(PNGDecContext *s) @@ -300,39 +307,41 @@ static void png_handle_row(PNGDecContext *s) 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); - } + ptr = s->image_buf + s->image_linesize * (s->y + s->y_offset) + s->x_offset * s->bpp; + 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); + 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) { + if (s->y == s->cur_h) { 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); + 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; + ptr = s->image_buf + s->image_linesize * (s->y + s->y_offset) + s->x_offset * s->bpp; 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 */ @@ -341,15 +350,16 @@ static void png_handle_row(PNGDecContext *s) 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) { - /* NOTE: RGB32 is handled directly in png_put_interlaced_row */ - png_put_interlaced_row(ptr, s->width, s->bits_per_pixel, s->pass, + png_put_interlaced_row(ptr, s->cur_w, s->bits_per_pixel, s->pass, s->color_type, s->last_row); } s->y++; - if (s->y == s->height) { + if (s->y == s->cur_h) { + memset(s->last_row, 0, s->row_size); for (;;) { if (s->pass == NB_PASSES - 1) { s->state |= PNG_ALLIMAGE; @@ -359,7 +369,7 @@ static void png_handle_row(PNGDecContext *s) s->y = 0; s->pass_row_size = ff_png_pass_row_size(s->pass, s->bits_per_pixel, - s->width); + s->cur_w); s->crow_size = s->pass_row_size + 1; if (s->pass_row_size != 0) break; @@ -376,14 +386,15 @@ 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 = s->gb.buffer; + 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) { - return -1; + 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)) { @@ -401,202 +412,647 @@ static int png_decode_idat(PNGDecContext *s, int length) return 0; } -static int decode_frame(AVCodecContext *avctx, - void *data, int *got_frame, - AVPacket *avpkt) +static int decode_zbuf(AVBPrint *bp, const uint8_t *data, + const uint8_t *data_end) { - PNGDecContext *const s = avctx->priv_data; - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; - AVFrame *p = data; - uint8_t *crow_buf_base = NULL; - uint32_t tag, length; + z_stream zstream; + unsigned char *buf; + unsigned buf_size; int ret; - /* check signature */ - if (buf_size < 8 || - (memcmp(buf, ff_pngsig, 8) != 0 && memcmp(buf, ff_mngsig, 8) != 0)) { - av_log(avctx, AV_LOG_ERROR, "Invalid PNG signature (%d).\n", buf_size); + 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; } - bytestream2_init(&s->gb, buf + 8, buf_size - 8); - s->y = s->state = 0; + 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_ihdr_chunk(AVCodecContext *avctx, PNGDecContext *s, + uint32_t length) +{ + if (length != 13) + return AVERROR_INVALIDDATA; + + if (s->state & PNG_IDAT) { + av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n"); + return AVERROR_INVALIDDATA; + } + + s->width = s->cur_w = bytestream2_get_be32(&s->gb); + s->height = s->cur_h = 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"); + return AVERROR_INVALIDDATA; + } + 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); + + return 0; +} + +static int decode_phys_chunk(AVCodecContext *avctx, PNGDecContext *s) +{ + if (s->state & PNG_IDAT) { + av_log(avctx, AV_LOG_ERROR, "pHYs after IDAT\n"); + return AVERROR_INVALIDDATA; + } + 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 */ + + return 0; +} + +static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s, + uint32_t length, AVFrame *p) +{ + int ret; + + if (!(s->state & PNG_IHDR)) { + av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n"); + return AVERROR_INVALIDDATA; + } + 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 = (s->cur_w * 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); + return AVERROR_INVALIDDATA; + } + + if ((ret = ff_thread_get_buffer(avctx, &s->picture, AV_GET_BUFFER_FLAG_REF)) < 0) + return ret; + 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->cur_w); + 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) + return AVERROR_INVALIDDATA; + 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) + return AVERROR_INVALIDDATA; + } + /* compressed row */ + av_fast_padded_malloc(&s->buffer, &s->buffer_size, s->row_size + 16); + if (!s->buffer) + return AVERROR(ENOMEM); + + /* 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 ((ret = png_decode_idat(s, length)) < 0) + return ret; + bytestream2_skip(&s->gb, 4); /* crc */ + + return 0; +} + +static int decode_plte_chunk(AVCodecContext *avctx, PNGDecContext *s, + uint32_t length) +{ + int n, i, r, g, b; + + if ((length % 3) != 0 || length > 256 * 3) + return AVERROR_INVALIDDATA; + /* 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 */ + + return 0; +} + +static int decode_trns_chunk(AVCodecContext *avctx, PNGDecContext *s, + uint32_t length) +{ + 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)) + return AVERROR_INVALIDDATA; + 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 */ + + return 0; +} + +static void handle_small_bpp(PNGDecContext *s, AVFrame *p) +{ + 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; + } + } else 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; + } + } else 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; + } + } +} + +static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s, + uint32_t length) +{ + uint32_t sequence_number; + + if (length != 26) + return AVERROR_INVALIDDATA; + + sequence_number = bytestream2_get_be32(&s->gb); + s->cur_w = bytestream2_get_be32(&s->gb); + s->cur_h = bytestream2_get_be32(&s->gb); + s->x_offset = bytestream2_get_be32(&s->gb); + s->y_offset = bytestream2_get_be32(&s->gb); + bytestream2_skip(&s->gb, 4); /* delay_num (2), delay_den (2) */ + s->dispose_op = bytestream2_get_byte(&s->gb); + s->blend_op = bytestream2_get_byte(&s->gb); + bytestream2_skip(&s->gb, 4); /* crc */ + + if (sequence_number == 0 && + (s->cur_w != s->width || + s->cur_h != s->height || + s->x_offset != 0 || + s->y_offset != 0) || + s->cur_w <= 0 || s->cur_h <= 0 || + s->x_offset < 0 || s->y_offset < 0 || + s->cur_w > s->width - s->x_offset|| s->cur_h > s->height - s->y_offset) + return AVERROR_INVALIDDATA; + + /* always (re)start with a clean frame */ + if (sequence_number == 0) { + s->dispose_op = APNG_DISPOSE_OP_BACKGROUND; + s->frame_id = 0; + } else { + s->frame_id++; + if (s->frame_id == 1 && s->dispose_op == APNG_DISPOSE_OP_PREVIOUS) + /* previous for the second frame is the first frame */ + s->dispose_op = APNG_DISPOSE_OP_NONE; + } + + return 0; +} + +static void handle_p_frame_png(PNGDecContext *s, AVFrame *p) +{ + 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; + } +} + +// divide by 255 and round to nearest +// apply a fast variant: (X+127)/255 = ((X+127)*257+257)>>16 = ((X+128)*257)>>16 +#define FAST_DIV255(x) ((((x) + 128) * 257) >> 16) + +static int handle_p_frame_apng(AVCodecContext *avctx, PNGDecContext *s, + AVFrame *p) +{ + int i, j; + uint8_t *pd = p->data[0]; + uint8_t *pd_last = s->last_picture.f->data[0]; + uint8_t *pd_last_region = s->dispose_op == APNG_DISPOSE_OP_PREVIOUS ? + s->previous_picture.f->data[0] : s->last_picture.f->data[0]; + int ls = FFMIN(av_image_get_linesize(p->format, s->width, 0), s->width * s->bpp); + + if (ls < 0) + return ls; + + if (s->blend_op == APNG_BLEND_OP_OVER && + avctx->pix_fmt != AV_PIX_FMT_RGBA && avctx->pix_fmt != AV_PIX_FMT_ARGB) { + avpriv_request_sample(avctx, "Blending with pixel format %s", + av_get_pix_fmt_name(avctx->pix_fmt)); + return AVERROR_PATCHWELCOME; + } + + ff_thread_await_progress(&s->last_picture, INT_MAX, 0); + if (s->dispose_op == APNG_DISPOSE_OP_PREVIOUS) + ff_thread_await_progress(&s->previous_picture, INT_MAX, 0); + + for (j = 0; j < s->y_offset; j++) { + memcpy(pd, pd_last, ls); + pd += s->image_linesize; + pd_last += s->image_linesize; + } + + if (s->dispose_op != APNG_DISPOSE_OP_BACKGROUND && s->blend_op == APNG_BLEND_OP_OVER) { + uint8_t ri, gi, bi, ai; + + pd_last_region += s->y_offset * s->image_linesize; + if (avctx->pix_fmt == AV_PIX_FMT_RGBA) { + ri = 0; + gi = 1; + bi = 2; + ai = 3; + } else { + ri = 3; + gi = 2; + bi = 1; + ai = 0; + } + + for (j = s->y_offset; j < s->y_offset + s->cur_h; j++) { + i = s->x_offset * s->bpp; + if (i) + memcpy(pd, pd_last, i); + for (; i < (s->x_offset + s->cur_w) * s->bpp; i += s->bpp) { + uint8_t alpha = pd[i+ai]; + + /* output = alpha * foreground + (1-alpha) * background */ + switch (alpha) { + case 0: + pd[i+ri] = pd_last_region[i+ri]; + pd[i+gi] = pd_last_region[i+gi]; + pd[i+bi] = pd_last_region[i+bi]; + pd[i+ai] = 0xff; + break; + case 255: + break; + default: + pd[i+ri] = FAST_DIV255(alpha * pd[i+ri] + (255 - alpha) * pd_last_region[i+ri]); + pd[i+gi] = FAST_DIV255(alpha * pd[i+gi] + (255 - alpha) * pd_last_region[i+gi]); + pd[i+bi] = FAST_DIV255(alpha * pd[i+bi] + (255 - alpha) * pd_last_region[i+bi]); + pd[i+ai] = 0xff; + break; + } + } + if (ls - i) + memcpy(pd+i, pd_last+i, ls - i); + pd += s->image_linesize; + pd_last += s->image_linesize; + pd_last_region += s->image_linesize; + } + } else { + for (j = s->y_offset; j < s->y_offset + s->cur_h; j++) { + int end_offset = (s->x_offset + s->cur_w) * s->bpp; + int end_len = ls - end_offset; + if (s->x_offset) + memcpy(pd, pd_last, s->x_offset * s->bpp); + if (end_len) + memcpy(pd+end_offset, pd_last+end_offset, end_len); + pd += s->image_linesize; + pd_last += s->image_linesize; + } + } + + for (j = s->y_offset + s->cur_h; j < s->height; j++) { + memcpy(pd, pd_last, ls); + pd += s->image_linesize; + pd_last += s->image_linesize; + } + + return 0; +} + +static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s, + AVFrame *p, AVPacket *avpkt) +{ + AVDictionary *metadata = NULL; + uint32_t tag, length; + int decode_next_dat = 0; + int ret = AVERROR_INVALIDDATA; + AVFrame *ref; - /* 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 (;;) { - if (bytestream2_get_bytes_left(&s->gb) <= 0) + length = bytestream2_get_bytes_left(&s->gb); + if (length <= 0) { + if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && length == 0) { + if (!(s->state & PNG_IDAT)) + return 0; + else + goto exit_loop; + } + av_log(avctx, AV_LOG_ERROR, "%d bytes left\n", length); + 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) + 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); - av_dlog(avctx, "png: tag=%c%c%c%c length=%u\n", + 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) + if (decode_ihdr_chunk(avctx, s, length) < 0) 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; + break; + case MKTAG('p', 'H', 'Y', 's'): + if (decode_phys_chunk(avctx, s) < 0) 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; - av_dlog(avctx, "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('I', 'D', 'A', 'T'): - if (!(s->state & PNG_IHDR)) + case MKTAG('f', 'c', 'T', 'L'): + if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG) + goto skip_tag; + if ((ret = decode_fctl_chunk(avctx, s, length)) < 0) 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 = AV_PIX_FMT_RGB24; - } else if (s->bit_depth == 8 && - s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - avctx->pix_fmt = AV_PIX_FMT_RGB32; - } else if (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 == 1 && - s->color_type == PNG_COLOR_TYPE_GRAY) { - avctx->pix_fmt = AV_PIX_FMT_MONOBLACK; - } else if (s->bit_depth == 8 && - s->color_type == PNG_COLOR_TYPE_PALETTE) { - avctx->pix_fmt = AV_PIX_FMT_PAL8; - } 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 { - goto fail; - } - - if (ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF) < 0) { - av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); - 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 (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 */ - 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) + decode_next_dat = 1; + break; + case MKTAG('f', 'd', 'A', 'T'): + if (!CONFIG_APNG_DECODER || avctx->codec_id != AV_CODEC_ID_APNG) + goto skip_tag; + if (!decode_next_dat) + goto fail; + bytestream2_get_be32(&s->gb); + length -= 4; + /* fallthrough */ + case MKTAG('I', 'D', 'A', 'T'): + if (CONFIG_APNG_DECODER && avctx->codec_id == AV_CODEC_ID_APNG && !decode_next_dat) + goto skip_tag; + if (decode_idat_chunk(avctx, s, length, p) < 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) + if (decode_plte_chunk(avctx, s, length) < 0) 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] = (0xff << 24) | (r << 16) | (g << 8) | b; - } - for (; i < 256; i++) - s->palette[i] = (0xff << 24); - s->state |= PNG_PLTE; - bytestream2_skip(&s->gb, 4); /* crc */ - } - break; + 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)) + if (decode_trns_chunk(avctx, s, length) < 0) 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; + 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: @@ -607,50 +1063,196 @@ skip_tag: } } exit_loop: + + if (s->bits_per_pixel <= 4) + handle_small_bpp(s, p); + /* handle p-frames only if a predecessor frame is available */ - if (s->prev->data[0]) { - if (!(avpkt->flags & AV_PKT_FLAG_KEY)) { - 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; - } + ref = s->dispose_op == APNG_DISPOSE_OP_PREVIOUS ? + s->previous_picture.f : s->last_picture.f; + if (ref->data[0]) { + if ( !(avpkt->flags & AV_PKT_FLAG_KEY) && avctx->codec_tag != AV_RL32("MPNG") + && ref->width == p->width + && ref->height== p->height + && ref->format== p->format + ) { + if (CONFIG_PNG_DECODER && avctx->codec_id != AV_CODEC_ID_APNG) + handle_p_frame_png(s, p); + else if (CONFIG_APNG_DECODER && + avctx->codec_id == AV_CODEC_ID_APNG && + (ret = handle_p_frame_apng(avctx, s, p)) < 0) + goto fail; } } + ff_thread_report_progress(&s->picture, INT_MAX, 0); + + av_frame_set_metadata(p, metadata); + metadata = NULL; + return 0; + +fail: + av_dict_free(&metadata); + ff_thread_report_progress(&s->picture, INT_MAX, 0); + return ret; +} + +#if CONFIG_PNG_DECODER +static int decode_frame_png(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; + 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, "Invalid PNG signature (%d).\n", buf_size); + return AVERROR_INVALIDDATA; + } - av_frame_unref(s->prev); - if ((ret = av_frame_ref(s->prev, p)) < 0) - goto fail; + 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; + } + + if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0) + goto the_end; + + 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); - av_free(crow_buf_base); s->crow_buf = NULL; - av_freep(&s->last_row); - av_freep(&s->tmp_row); return ret; -fail: - ret = -1; - goto the_end; +} +#endif + +#if CONFIG_APNG_DECODER +static int decode_frame_apng(AVCodecContext *avctx, + void *data, int *got_frame, + AVPacket *avpkt) +{ + PNGDecContext *const s = avctx->priv_data; + int ret; + AVFrame *p; + ThreadFrame tmp; + + ff_thread_release_buffer(avctx, &s->previous_picture); + tmp = s->previous_picture; + s->previous_picture = s->last_picture; + s->last_picture = s->picture; + s->picture = tmp; + p = s->picture.f; + + if (!(s->state & PNG_IHDR)) { + if (!avctx->extradata_size) + return AVERROR_INVALIDDATA; + + /* only init fields, there is no zlib use in extradata */ + s->zstream.zalloc = ff_png_zalloc; + s->zstream.zfree = ff_png_zfree; + + bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size); + if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0) + goto end; + } + + /* reset state for a new frame */ + if ((ret = inflateInit(&s->zstream)) != Z_OK) { + av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret); + ret = AVERROR_EXTERNAL; + goto end; + } + s->y = 0; + s->state &= ~(PNG_IDAT | PNG_ALLIMAGE); + bytestream2_init(&s->gb, avpkt->data, avpkt->size); + if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0) + goto end; + + if (!(s->state & PNG_ALLIMAGE)) + av_log(avctx, AV_LOG_WARNING, "Frame did not contain a complete image\n"); + if (!(s->state & (PNG_ALLIMAGE|PNG_IDAT))) { + ret = AVERROR_INVALIDDATA; + goto end; + } + if ((ret = av_frame_ref(data, s->picture.f)) < 0) + goto end; + + *got_frame = 1; + ret = bytestream2_tell(&s->gb); + +end: + inflateEnd(&s->zstream); + return ret; +} +#endif + +static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src) +{ + PNGDecContext *psrc = src->priv_data; + PNGDecContext *pdst = dst->priv_data; + int ret; + + if (dst == src) + return 0; + + pdst->frame_id = psrc->frame_id; + + ff_thread_release_buffer(dst, &pdst->picture); + if (psrc->picture.f->data[0] && + (ret = ff_thread_ref_frame(&pdst->picture, &psrc->picture)) < 0) + return ret; + if (CONFIG_APNG_DECODER && dst->codec_id == AV_CODEC_ID_APNG) { + ff_thread_release_buffer(dst, &pdst->last_picture); + if (psrc->last_picture.f->data[0]) + return ff_thread_ref_frame(&pdst->last_picture, &psrc->last_picture); + } + + return 0; } static av_cold int png_dec_init(AVCodecContext *avctx) { PNGDecContext *s = avctx->priv_data; - s->prev = av_frame_alloc(); - if (!s->prev) + s->avctx = avctx; + s->previous_picture.f = av_frame_alloc(); + s->last_picture.f = av_frame_alloc(); + s->picture.f = av_frame_alloc(); + if (!s->previous_picture.f || !s->last_picture.f || !s->picture.f) { + av_frame_free(&s->previous_picture.f); + av_frame_free(&s->last_picture.f); + av_frame_free(&s->picture.f); return AVERROR(ENOMEM); + } - ff_pngdsp_init(&s->dsp); + if (!avctx->internal->is_copy) { + avctx->internal->allocate_progress = 1; + ff_pngdsp_init(&s->dsp); + } return 0; } @@ -659,11 +1261,39 @@ static av_cold int png_dec_end(AVCodecContext *avctx) { PNGDecContext *s = avctx->priv_data; - av_frame_free(&s->prev); + ff_thread_release_buffer(avctx, &s->previous_picture); + av_frame_free(&s->previous_picture.f); + 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; } +#if CONFIG_APNG_DECODER +AVCodec ff_apng_decoder = { + .name = "apng", + .long_name = NULL_IF_CONFIG_SMALL("APNG (Animated Portable Network Graphics) image"), + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_APNG, + .priv_data_size = sizeof(PNGDecContext), + .init = png_dec_init, + .close = png_dec_end, + .decode = decode_frame_apng, + .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*/, +}; +#endif + +#if CONFIG_PNG_DECODER AVCodec ff_png_decoder = { .name = "png", .long_name = NULL_IF_CONFIG_SMALL("PNG (Portable Network Graphics) image"), @@ -672,6 +1302,9 @@ AVCodec ff_png_decoder = { .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*/, + .decode = decode_frame_png, + .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*/, }; +#endif |