32 #define IOBUF_SIZE 4096
48 int bits_per_pixel,
int pass,
51 int x,
mask, dst_x, j,
b, bpp;
56 switch(bits_per_pixel) {
58 memset(dst, 0, row_size);
60 for(x = 0; x <
width; x++) {
62 if ((mask << j) & 0x80) {
63 b = (src[x >> 3] >> (7 - j)) & 1;
64 dst[dst_x >> 3] |= b << (7 - (dst_x & 7));
70 bpp = bits_per_pixel >> 3;
73 for(x = 0; x <
width; x++) {
75 if ((mask << j) & 0x80) {
88 for(i = 0; i < w; i++) {
89 int a,
b, c, p, pa, pb, pc;
102 if (pa <= pb && pa <= pc)
117 switch(filter_type) {
119 memcpy(dst, src, size);
123 memcpy(dst, src, bpp);
129 for(i = 0; i < bpp; i++)
130 dst[i] = src[i] - (top[i] >> 1);
132 dst[i] = src[i] - ((src[i-bpp] + top[i]) >> 1);
135 for(i = 0; i < bpp; i++)
136 dst[i] = src[i] - top[i];
146 assert(bpp || !pred);
151 int cost, bcost = INT_MAX;
152 uint8_t *buf1 = dst, *buf2 = dst + size + 16;
153 for(pred=0; pred<5; pred++) {
157 for(i=0; i<=
size; i++)
158 cost += abs((int8_t)buf1[i]);
179 for(j = 0; j <
width; j++) {
180 v = ((
const uint32_t *)src)[j];
190 const uint8_t *buf,
int length)
195 bytestream_put_be32(f, length);
196 crc = crc32(0, Z_NULL, 0);
198 crc = crc32(crc, tagbuf, 4);
201 crc = crc32(crc, buf, length);
202 memcpy(*f, buf, length);
205 bytestream_put_be32(f, crc);
215 while (s->
zstream.avail_in > 0) {
216 ret = deflate(&s->
zstream, Z_NO_FLUSH);
219 if (s->
zstream.avail_out == 0) {
230 const AVFrame *pict,
int *got_packet)
233 const AVFrame *
const p = pict;
234 int bit_depth, color_type, y,
len, row_size, ret, is_progressive;
235 int bits_per_pixel, pass_row_size, enc_row_size, max_packet_size;
236 int compression_level;
273 row_size = (avctx->
width * bits_per_pixel + 7) >> 3;
279 Z_DEFAULT_COMPRESSION :
281 ret = deflateInit2(&s->
zstream, compression_level,
282 Z_DEFLATED, 15, 8, Z_DEFAULT_STRATEGY);
286 enc_row_size = deflateBound(&s->
zstream, row_size);
287 max_packet_size = avctx->
height * (enc_row_size +
304 crow_buf = crow_base + 15;
305 if (is_progressive) {
306 progressive_buf =
av_malloc(row_size + 1);
307 if (!progressive_buf)
327 s->
buf[8] = bit_depth;
328 s->
buf[9] = color_type;
331 s->
buf[12] = is_progressive;
337 int has_alpha, alpha, i;
342 palette = (uint32_t *)p->
data[1];
344 alpha_ptr = s->
buf + 256 * 3;
346 for(i = 0; i < 256; i++) {
349 if (alpha && alpha != 0xff)
351 *alpha_ptr++ = alpha;
352 bytestream_put_be24(&ptr, v);
363 if (is_progressive) {
366 for(pass = 0; pass <
NB_PASSES; pass++) {
370 if (pass_row_size > 0) {
372 for(y = 0; y < avctx->
height; y++) {
381 bits_per_pixel, pass,
383 crow =
png_choose_filter(s, crow_buf, progressive_buf, top, pass_row_size, bits_per_pixel>>3);
385 top = progressive_buf;
392 for(y = 0; y < avctx->
height; y++) {
406 ret = deflate(&s->
zstream, Z_FINISH);
407 if (ret == Z_OK || ret == Z_STREAM_END) {
414 if (ret == Z_STREAM_END)