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Diffstat (limited to 'contrib/ffmpeg/libavcodec/pngenc.c')
-rw-r--r--contrib/ffmpeg/libavcodec/pngenc.c448
1 files changed, 0 insertions, 448 deletions
diff --git a/contrib/ffmpeg/libavcodec/pngenc.c b/contrib/ffmpeg/libavcodec/pngenc.c
deleted file mode 100644
index 703371d85..000000000
--- a/contrib/ffmpeg/libavcodec/pngenc.c
+++ /dev/null
@@ -1,448 +0,0 @@
-/*
- * PNG image format
- * Copyright (c) 2003 Fabrice Bellard.
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-#include "avcodec.h"
-#include "bytestream.h"
-#include "png.h"
-#include <dsputil.h>
-
-/* TODO:
- * - add 2, 4 and 16 bit depth support
- */
-
-#include <zlib.h>
-
-//#define DEBUG
-
-#define IOBUF_SIZE 4096
-
-typedef struct PNGEncContext {
- DSPContext dsp;
-
- uint8_t *bytestream;
- uint8_t *bytestream_start;
- uint8_t *bytestream_end;
- AVFrame picture;
-
- int filter_type;
-
- z_stream zstream;
- uint8_t buf[IOBUF_SIZE];
-} PNGEncContext;
-
-static void png_get_interlaced_row(uint8_t *dst, int row_size,
- int bits_per_pixel, int pass,
- const uint8_t *src, int width)
-{
- int x, mask, dst_x, j, b, bpp;
- uint8_t *d;
- const uint8_t *s;
-
- mask = ff_png_pass_mask[pass];
- switch(bits_per_pixel) {
- case 1:
- memset(dst, 0, row_size);
- dst_x = 0;
- for(x = 0; x < width; x++) {
- j = (x & 7);
- if ((mask << j) & 0x80) {
- b = (src[x >> 3] >> (7 - j)) & 1;
- dst[dst_x >> 3] |= b << (7 - (dst_x & 7));
- dst_x++;
- }
- }
- break;
- default:
- bpp = bits_per_pixel >> 3;
- d = dst;
- s = src;
- for(x = 0; x < width; x++) {
- j = x & 7;
- if ((mask << j) & 0x80) {
- memcpy(d, s, bpp);
- d += bpp;
- }
- s += bpp;
- }
- break;
- }
-}
-
-static void sub_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 = src[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] = src[i] - p;
- }
-}
-
-static void png_filter_row(DSPContext *dsp, uint8_t *dst, int filter_type,
- uint8_t *src, uint8_t *top, int size, int bpp)
-{
- int i;
-
- switch(filter_type) {
- case PNG_FILTER_VALUE_NONE:
- memcpy(dst, src, size);
- break;
- case PNG_FILTER_VALUE_SUB:
- dsp->diff_bytes(dst, src, src-bpp, size);
- memcpy(dst, src, bpp);
- break;
- case PNG_FILTER_VALUE_UP:
- dsp->diff_bytes(dst, src, top, size);
- break;
- case PNG_FILTER_VALUE_AVG:
- for(i = 0; i < bpp; i++)
- dst[i] = src[i] - (top[i] >> 1);
- for(; i < size; i++)
- dst[i] = src[i] - ((src[i-bpp] + top[i]) >> 1);
- break;
- case PNG_FILTER_VALUE_PAETH:
- for(i = 0; i < bpp; i++)
- dst[i] = src[i] - top[i];
- sub_png_paeth_prediction(dst+i, src+i, top+i, size-i, bpp);
- break;
- }
-}
-
-static uint8_t *png_choose_filter(PNGEncContext *s, uint8_t *dst,
- uint8_t *src, uint8_t *top, int size, int bpp)
-{
- int pred = s->filter_type;
- assert(bpp || !pred);
- if(!top && pred)
- pred = PNG_FILTER_VALUE_SUB;
- if(pred == PNG_FILTER_VALUE_MIXED) {
- int i;
- int cost, bcost = INT_MAX;
- uint8_t *buf1 = dst, *buf2 = dst + size + 16;
- for(pred=0; pred<5; pred++) {
- png_filter_row(&s->dsp, buf1+1, pred, src, top, size, bpp);
- buf1[0] = pred;
- cost = 0;
- for(i=0; i<=size; i++)
- cost += abs((int8_t)buf1[i]);
- if(cost < bcost) {
- bcost = cost;
- FFSWAP(uint8_t*, buf1, buf2);
- }
- }
- return buf2;
- } else {
- png_filter_row(&s->dsp, dst+1, pred, src, top, size, bpp);
- dst[0] = pred;
- return dst;
- }
-}
-
-static void convert_from_rgb32(uint8_t *dst, const uint8_t *src, int width)
-{
- uint8_t *d;
- int j;
- unsigned int v;
-
- d = dst;
- for(j = 0; j < width; j++) {
- v = ((const uint32_t *)src)[j];
- d[0] = v >> 16;
- d[1] = v >> 8;
- d[2] = v;
- d[3] = v >> 24;
- d += 4;
- }
-}
-
-static void png_write_chunk(uint8_t **f, uint32_t tag,
- const uint8_t *buf, int length)
-{
- uint32_t crc;
- uint8_t tagbuf[4];
-
- bytestream_put_be32(f, length);
- crc = crc32(0, Z_NULL, 0);
- AV_WL32(tagbuf, tag);
- crc = crc32(crc, tagbuf, 4);
- bytestream_put_be32(f, bswap_32(tag));
- if (length > 0) {
- crc = crc32(crc, buf, length);
- memcpy(*f, buf, length);
- *f += length;
- }
- bytestream_put_be32(f, crc);
-}
-
-/* XXX: do filtering */
-static int png_write_row(PNGEncContext *s, const uint8_t *data, int size)
-{
- int ret;
-
- s->zstream.avail_in = size;
- s->zstream.next_in = (uint8_t *)data;
- while (s->zstream.avail_in > 0) {
- ret = deflate(&s->zstream, Z_NO_FLUSH);
- if (ret != Z_OK)
- return -1;
- if (s->zstream.avail_out == 0) {
- if(s->bytestream_end - s->bytestream > IOBUF_SIZE + 100)
- png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, IOBUF_SIZE);
- s->zstream.avail_out = IOBUF_SIZE;
- s->zstream.next_out = s->buf;
- }
- }
- return 0;
-}
-
-static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
- PNGEncContext *s = avctx->priv_data;
- AVFrame *pict = data;
- AVFrame * const p= (AVFrame*)&s->picture;
- int bit_depth, color_type, y, len, row_size, ret, is_progressive;
- int bits_per_pixel, pass_row_size;
- int compression_level;
- uint8_t *ptr, *top;
- uint8_t *crow_base = NULL, *crow_buf, *crow;
- uint8_t *progressive_buf = NULL;
- uint8_t *rgba_buf = NULL;
- uint8_t *top_buf = NULL;
-
- *p = *pict;
- p->pict_type= FF_I_TYPE;
- p->key_frame= 1;
-
- s->bytestream_start=
- s->bytestream= buf;
- s->bytestream_end= buf+buf_size;
-
- is_progressive = !!(avctx->flags & CODEC_FLAG_INTERLACED_DCT);
- switch(avctx->pix_fmt) {
- case PIX_FMT_RGB32:
- bit_depth = 8;
- color_type = PNG_COLOR_TYPE_RGB_ALPHA;
- break;
- case PIX_FMT_RGB24:
- bit_depth = 8;
- color_type = PNG_COLOR_TYPE_RGB;
- break;
- case PIX_FMT_GRAY8:
- bit_depth = 8;
- color_type = PNG_COLOR_TYPE_GRAY;
- break;
- case PIX_FMT_MONOBLACK:
- bit_depth = 1;
- color_type = PNG_COLOR_TYPE_GRAY;
- break;
- case PIX_FMT_PAL8:
- bit_depth = 8;
- color_type = PNG_COLOR_TYPE_PALETTE;
- break;
- default:
- return -1;
- }
- bits_per_pixel = ff_png_get_nb_channels(color_type) * bit_depth;
- row_size = (avctx->width * bits_per_pixel + 7) >> 3;
-
- s->zstream.zalloc = ff_png_zalloc;
- s->zstream.zfree = ff_png_zfree;
- s->zstream.opaque = NULL;
- compression_level = avctx->compression_level == FF_COMPRESSION_DEFAULT ?
- Z_DEFAULT_COMPRESSION :
- av_clip(avctx->compression_level, 0, 9);
- ret = deflateInit2(&s->zstream, compression_level,
- Z_DEFLATED, 15, 8, Z_DEFAULT_STRATEGY);
- if (ret != Z_OK)
- return -1;
- crow_base = av_malloc((row_size + 32) << (s->filter_type == PNG_FILTER_VALUE_MIXED));
- if (!crow_base)
- goto fail;
- crow_buf = crow_base + 15; // pixel data should be aligned, but there's a control byte before it
- if (is_progressive) {
- progressive_buf = av_malloc(row_size + 1);
- if (!progressive_buf)
- goto fail;
- }
- if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
- rgba_buf = av_malloc(row_size + 1);
- if (!rgba_buf)
- goto fail;
- }
- if (is_progressive || color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
- top_buf = av_malloc(row_size + 1);
- if (!top_buf)
- goto fail;
- }
-
- /* write png header */
- memcpy(s->bytestream, ff_pngsig, 8);
- s->bytestream += 8;
-
- AV_WB32(s->buf, avctx->width);
- AV_WB32(s->buf + 4, avctx->height);
- s->buf[8] = bit_depth;
- s->buf[9] = color_type;
- s->buf[10] = 0; /* compression type */
- s->buf[11] = 0; /* filter type */
- s->buf[12] = is_progressive; /* interlace type */
-
- png_write_chunk(&s->bytestream, MKTAG('I', 'H', 'D', 'R'), s->buf, 13);
-
- /* put the palette if needed */
- if (color_type == PNG_COLOR_TYPE_PALETTE) {
- int has_alpha, alpha, i;
- unsigned int v;
- uint32_t *palette;
- uint8_t *alpha_ptr;
-
- palette = (uint32_t *)p->data[1];
- ptr = s->buf;
- alpha_ptr = s->buf + 256 * 3;
- has_alpha = 0;
- for(i = 0; i < 256; i++) {
- v = palette[i];
- alpha = v >> 24;
- if (alpha && alpha != 0xff)
- has_alpha = 1;
- *alpha_ptr++ = alpha;
- bytestream_put_be24(&ptr, v);
- }
- png_write_chunk(&s->bytestream, MKTAG('P', 'L', 'T', 'E'), s->buf, 256 * 3);
- if (has_alpha) {
- png_write_chunk(&s->bytestream, MKTAG('t', 'R', 'N', 'S'), s->buf + 256 * 3, 256);
- }
- }
-
- /* now put each row */
- s->zstream.avail_out = IOBUF_SIZE;
- s->zstream.next_out = s->buf;
- if (is_progressive) {
- int pass;
-
- for(pass = 0; pass < NB_PASSES; pass++) {
- /* NOTE: a pass is completely omited if no pixels would be
- output */
- pass_row_size = ff_png_pass_row_size(pass, bits_per_pixel, avctx->width);
- if (pass_row_size > 0) {
- top = NULL;
- for(y = 0; y < avctx->height; y++) {
- if ((ff_png_pass_ymask[pass] << (y & 7)) & 0x80) {
- ptr = p->data[0] + y * p->linesize[0];
- FFSWAP(uint8_t*, progressive_buf, top_buf);
- if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
- convert_from_rgb32(rgba_buf, ptr, avctx->width);
- ptr = rgba_buf;
- }
- png_get_interlaced_row(progressive_buf, pass_row_size,
- bits_per_pixel, pass,
- ptr, avctx->width);
- crow = png_choose_filter(s, crow_buf, progressive_buf, top, pass_row_size, bits_per_pixel>>3);
- png_write_row(s, crow, pass_row_size + 1);
- top = progressive_buf;
- }
- }
- }
- }
- } else {
- top = NULL;
- for(y = 0; y < avctx->height; y++) {
- ptr = p->data[0] + y * p->linesize[0];
- if (color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
- FFSWAP(uint8_t*, rgba_buf, top_buf);
- convert_from_rgb32(rgba_buf, ptr, avctx->width);
- ptr = rgba_buf;
- }
- crow = png_choose_filter(s, crow_buf, ptr, top, row_size, bits_per_pixel>>3);
- png_write_row(s, crow, row_size + 1);
- top = ptr;
- }
- }
- /* compress last bytes */
- for(;;) {
- ret = deflate(&s->zstream, Z_FINISH);
- if (ret == Z_OK || ret == Z_STREAM_END) {
- len = IOBUF_SIZE - s->zstream.avail_out;
- if (len > 0 && s->bytestream_end - s->bytestream > len + 100) {
- png_write_chunk(&s->bytestream, MKTAG('I', 'D', 'A', 'T'), s->buf, len);
- }
- s->zstream.avail_out = IOBUF_SIZE;
- s->zstream.next_out = s->buf;
- if (ret == Z_STREAM_END)
- break;
- } else {
- goto fail;
- }
- }
- png_write_chunk(&s->bytestream, MKTAG('I', 'E', 'N', 'D'), NULL, 0);
-
- ret = s->bytestream - s->bytestream_start;
- the_end:
- av_free(crow_base);
- av_free(progressive_buf);
- av_free(rgba_buf);
- av_free(top_buf);
- deflateEnd(&s->zstream);
- return ret;
- fail:
- ret = -1;
- goto the_end;
-}
-
-static int png_enc_init(AVCodecContext *avctx){
- PNGEncContext *s = avctx->priv_data;
-
- avcodec_get_frame_defaults((AVFrame*)&s->picture);
- avctx->coded_frame= (AVFrame*)&s->picture;
- dsputil_init(&s->dsp, avctx);
-
- s->filter_type = av_clip(avctx->prediction_method, PNG_FILTER_VALUE_NONE, PNG_FILTER_VALUE_MIXED);
- if(avctx->pix_fmt == PIX_FMT_MONOBLACK)
- s->filter_type = PNG_FILTER_VALUE_NONE;
-
- return 0;
-}
-
-AVCodec png_encoder = {
- "png",
- CODEC_TYPE_VIDEO,
- CODEC_ID_PNG,
- sizeof(PNGEncContext),
- png_enc_init,
- encode_frame,
- NULL, //encode_end,
- .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_PAL8, PIX_FMT_GRAY8, PIX_FMT_MONOBLACK, -1},
-};
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-02 23:13:29 +0000