mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 4346 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Fabrice Bellard
20 years ago
parent
c62112ff06
commit
240c1657dc
6 changed files with 933 additions and 3 deletions
@ -0,0 +1,407 @@ |
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/*
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* DVB subtitle encoding for ffmpeg |
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* Copyright (c) 2005 Fabrice Bellard. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include "avcodec.h" |
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typedef struct DVBSubtitleContext { |
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int hide_state; |
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int object_version; |
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} DVBSubtitleContext; |
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#define PUTBITS2(val)\ |
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{\
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bitbuf |= (val) << bitcnt;\
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bitcnt -= 2;\
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if (bitcnt < 0) {\
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bitcnt = 6;\
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*q++ = bitbuf;\
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bitbuf = 0;\
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}\
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} |
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static void dvb_encode_rle2(uint8_t **pq, |
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const uint8_t *bitmap, int linesize, |
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int w, int h) |
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{ |
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uint8_t *q; |
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unsigned int bitbuf; |
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int bitcnt; |
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int x, y, len, x1, v, color; |
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q = *pq; |
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for(y = 0; y < h; y++) { |
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*q++ = 0x10; |
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bitbuf = 0; |
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bitcnt = 6; |
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x = 0; |
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while (x < w) { |
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x1 = x; |
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color = bitmap[x1++]; |
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while (x1 < w && bitmap[x1] == color) |
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x1++; |
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len = x1 - x; |
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if (color == 0 && len == 2) { |
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PUTBITS2(0); |
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PUTBITS2(0); |
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PUTBITS2(1); |
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} else if (len >= 3 && len <= 10) { |
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v = len - 3; |
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PUTBITS2(0); |
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PUTBITS2((v >> 2) | 2); |
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PUTBITS2(v & 3); |
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PUTBITS2(color); |
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} else if (len >= 12 && len <= 27) { |
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v = len - 12; |
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PUTBITS2(0); |
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PUTBITS2(0); |
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PUTBITS2(2); |
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PUTBITS2(v >> 2); |
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PUTBITS2(v & 3); |
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PUTBITS2(color); |
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} else if (len >= 29) { |
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/* length = 29 ... 284 */ |
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if (len > 284) |
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len = 284; |
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v = len - 29; |
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PUTBITS2(0); |
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PUTBITS2(0); |
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PUTBITS2(3); |
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PUTBITS2((v >> 6)); |
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PUTBITS2((v >> 4) & 3); |
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PUTBITS2((v >> 2) & 3); |
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PUTBITS2(v & 3); |
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PUTBITS2(color); |
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} else { |
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PUTBITS2(color); |
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if (color == 0) { |
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PUTBITS2(1); |
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} |
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len = 1; |
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} |
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x += len; |
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} |
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/* end of line */ |
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PUTBITS2(0); |
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PUTBITS2(0); |
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PUTBITS2(0); |
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if (bitcnt != 6) { |
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*q++ = bitbuf; |
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} |
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*q++ = 0xf0; |
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bitmap += linesize; |
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} |
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*pq = q; |
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} |
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#define PUTBITS4(val)\ |
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{\
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bitbuf |= (val) << bitcnt;\
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bitcnt -= 4;\
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if (bitcnt < 0) {\
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bitcnt = 4;\
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*q++ = bitbuf;\
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bitbuf = 0;\
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}\
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} |
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/* some DVB decoders only implement 4 bits/pixel */ |
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static void dvb_encode_rle4(uint8_t **pq, |
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const uint8_t *bitmap, int linesize, |
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int w, int h) |
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{ |
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uint8_t *q; |
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unsigned int bitbuf; |
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int bitcnt; |
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int x, y, len, x1, v, color; |
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q = *pq; |
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for(y = 0; y < h; y++) { |
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*q++ = 0x11; |
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bitbuf = 0; |
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bitcnt = 4; |
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x = 0; |
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while (x < w) { |
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x1 = x; |
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color = bitmap[x1++]; |
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while (x1 < w && bitmap[x1] == color) |
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x1++; |
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len = x1 - x; |
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if (color == 0 && len == 2) { |
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PUTBITS4(0); |
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PUTBITS4(0xd); |
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} else if (color == 0 && (len >= 3 && len <= 9)) { |
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PUTBITS4(0); |
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PUTBITS4(len - 2); |
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} else if (len >= 4 && len <= 7) { |
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PUTBITS4(0); |
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PUTBITS4(8 + len - 4); |
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PUTBITS4(color); |
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} else if (len >= 9 && len <= 24) { |
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PUTBITS4(0); |
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PUTBITS4(0xe); |
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PUTBITS4(len - 9); |
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PUTBITS4(color); |
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} else if (len >= 25) { |
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if (len > 280) |
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len = 280; |
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v = len - 25; |
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PUTBITS4(0); |
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PUTBITS4(0xf); |
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PUTBITS4(v >> 4); |
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PUTBITS4(v & 0xf); |
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PUTBITS4(color); |
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} else { |
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PUTBITS4(color); |
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if (color == 0) { |
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PUTBITS4(0xc); |
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} |
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len = 1; |
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} |
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x += len; |
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} |
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/* end of line */ |
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PUTBITS4(0); |
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PUTBITS4(0); |
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if (bitcnt != 4) { |
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*q++ = bitbuf; |
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} |
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*q++ = 0xf0; |
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bitmap += linesize; |
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} |
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*pq = q; |
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} |
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#define SCALEBITS 10 |
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#define ONE_HALF (1 << (SCALEBITS - 1)) |
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#define FIX(x) ((int) ((x) * (1<<SCALEBITS) + 0.5)) |
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#define RGB_TO_Y_CCIR(r, g, b) \ |
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((FIX(0.29900*219.0/255.0) * (r) + FIX(0.58700*219.0/255.0) * (g) + \
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FIX(0.11400*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS) |
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#define RGB_TO_U_CCIR(r1, g1, b1, shift)\ |
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(((- FIX(0.16874*224.0/255.0) * r1 - FIX(0.33126*224.0/255.0) * g1 + \
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FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) |
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#define RGB_TO_V_CCIR(r1, g1, b1, shift)\ |
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(((FIX(0.50000*224.0/255.0) * r1 - FIX(0.41869*224.0/255.0) * g1 - \
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FIX(0.08131*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128) |
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static inline void putbe16(uint8_t **pq, uint16_t v) |
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{ |
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uint8_t *q; |
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q = *pq; |
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*q++ = v >> 8; |
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*q++ = v; |
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*pq = q; |
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} |
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static int encode_dvb_subtitles(DVBSubtitleContext *s,
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uint8_t *outbuf, AVSubtitle *h) |
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{ |
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uint8_t *q, *pseg_len; |
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int page_id, region_id, clut_id, object_id, i, bpp_index, page_state; |
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q = outbuf; |
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page_id = 1; |
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region_id = 0; |
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clut_id = 0; |
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object_id = 0; |
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if (h->nb_colors <= 4) { |
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/* 2 bpp, some decoders do not support it correctly */ |
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bpp_index = 0; |
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} else if (h->nb_colors <= 16) { |
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/* 4 bpp, standard encoding */ |
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bpp_index = 1; |
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} else { |
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return -1; |
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} |
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*q++ = 0x00; /* subtitle_stream_id */ |
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/* page composition segment */ |
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*q++ = 0x0f; /* sync_byte */ |
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*q++ = 0x10; /* segment_type */ |
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putbe16(&q, page_id); |
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pseg_len = q; |
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q += 2; /* segment length */ |
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*q++ = 30; /* page_timeout (seconds) */ |
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if (s->hide_state) |
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page_state = 0; /* normal case */ |
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else |
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page_state = 2; /* mode change */ |
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/* page_version = 0 + page_state */ |
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*q++ = s->object_version | (page_state << 2) | 3;
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*q++ = region_id; |
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*q++ = 0xff; /* reserved */ |
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putbe16(&q, 0); /* left pos */ |
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putbe16(&q, 0); /* top pos */ |
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putbe16(&pseg_len, q - pseg_len - 2); |
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if (!s->hide_state) { |
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/* CLUT segment */ |
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*q++ = 0x0f; /* sync byte */ |
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*q++ = 0x12; /* CLUT definition segment */ |
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putbe16(&q, page_id); |
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pseg_len = q; |
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q += 2; /* segment length */ |
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*q++ = clut_id; |
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*q++ = (0 << 4) | 0xf; /* version = 0 */ |
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for(i = 0; i < h->nb_colors; i++) { |
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*q++ = i; /* clut_entry_id */ |
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*q++ = (1 << (7 - bpp_index)) | (0xf << 1) | 1; /* 2 bits/pixel full range */ |
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{ |
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int a, r, g, b; |
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a = (h->rgba_palette[i] >> 24) & 0xff; |
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r = (h->rgba_palette[i] >> 16) & 0xff; |
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g = (h->rgba_palette[i] >> 8) & 0xff; |
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b = (h->rgba_palette[i] >> 0) & 0xff; |
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*q++ = RGB_TO_Y_CCIR(r, g, b); |
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*q++ = RGB_TO_V_CCIR(r, g, b, 0); |
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*q++ = RGB_TO_U_CCIR(r, g, b, 0); |
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*q++ = 255 - a; |
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} |
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} |
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putbe16(&pseg_len, q - pseg_len - 2); |
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} |
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/* region composition segment */ |
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*q++ = 0x0f; /* sync_byte */ |
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*q++ = 0x11; /* segment_type */ |
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putbe16(&q, page_id); |
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pseg_len = q; |
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q += 2; /* segment length */ |
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*q++ = region_id; |
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*q++ = (s->object_version << 4) | (0 << 3) | 0x07; /* version , no fill */ |
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putbe16(&q, 720); /* region width */ |
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putbe16(&q, 576); /* region height */ |
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*q++ = ((1 + bpp_index) << 5) | ((1 + bpp_index) << 2) | 0x03;
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*q++ = clut_id; |
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*q++ = 0; /* 8 bit fill colors */ |
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*q++ = 0x03; /* 4 bit and 2 bit fill colors */ |
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if (!s->hide_state) { |
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putbe16(&q, object_id); |
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*q++ = (0 << 6) | (0 << 4) | ((h->x >> 8) & 0xf);
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*q++ = h->x; |
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*q++ = 0xf0 | ((h->y >> 8) & 0xf); |
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*q++ = h->y; |
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} |
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putbe16(&pseg_len, q - pseg_len - 2); |
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if (!s->hide_state) { |
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/* Object Data segment */ |
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*q++ = 0x0f; /* sync byte */ |
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*q++ = 0x13; |
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putbe16(&q, page_id); |
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pseg_len = q; |
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q += 2; /* segment length */ |
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putbe16(&q, object_id); |
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*q++ = (s->object_version << 4) | (0 << 2) | (0 << 1) | 1; /* version = 0,
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onject_coding_method, |
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non_modifying_color_flag */ |
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{ |
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uint8_t *ptop_field_len, *pbottom_field_len, *top_ptr, *bottom_ptr; |
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void (*dvb_encode_rle)(uint8_t **pq, |
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const uint8_t *bitmap, int linesize, |
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int w, int h); |
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ptop_field_len = q; |
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q += 2; |
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pbottom_field_len = q; |
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q += 2; |
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if (bpp_index == 0) |
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dvb_encode_rle = dvb_encode_rle2; |
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else |
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dvb_encode_rle = dvb_encode_rle4; |
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top_ptr = q; |
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dvb_encode_rle(&q, h->bitmap, h->w * 2, h->w, h->h >> 1); |
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bottom_ptr = q; |
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dvb_encode_rle(&q, h->bitmap + h->w, h->w * 2, h->w, h->h >> 1); |
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putbe16(&ptop_field_len, bottom_ptr - top_ptr); |
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putbe16(&pbottom_field_len, q - bottom_ptr); |
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} |
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putbe16(&pseg_len, q - pseg_len - 2); |
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} |
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/* end of display set segment */ |
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*q++ = 0x0f; /* sync_byte */ |
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*q++ = 0x80; /* segment_type */ |
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putbe16(&q, page_id); |
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pseg_len = q; |
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q += 2; /* segment length */ |
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putbe16(&pseg_len, q - pseg_len - 2); |
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*q++ = 0xff; /* end of PES data */ |
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s->object_version = (s->object_version + 1) & 0xf; |
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s->hide_state = !s->hide_state; |
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return q - outbuf; |
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} |
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static int dvbsub_init_decoder(AVCodecContext *avctx) |
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{ |
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return 0; |
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} |
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static int dvbsub_close_decoder(AVCodecContext *avctx) |
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{ |
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return 0; |
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} |
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static int dvbsub_encode(AVCodecContext *avctx, |
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unsigned char *buf, int buf_size, void *data) |
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{ |
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DVBSubtitleContext *s = avctx->priv_data; |
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AVSubtitle *sub = data; |
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int ret; |
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ret = encode_dvb_subtitles(s, buf, sub); |
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return ret; |
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} |
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AVCodec dvbsub_encoder = { |
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"dvbsub", |
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CODEC_TYPE_SUBTITLE, |
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CODEC_ID_DVB_SUBTITLE, |
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sizeof(DVBSubtitleContext), |
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dvbsub_init_decoder, |
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dvbsub_encode, |
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dvbsub_close_decoder, |
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}; |
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@ -0,0 +1,459 @@ |
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/*
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* DVD subtitle decoding for ffmpeg |
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* Copyright (c) 2005 Fabrice Bellard. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include "avcodec.h" |
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//#define DEBUG
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typedef struct DVDSubContext { |
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} DVDSubContext; |
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static int dvdsub_init_decoder(AVCodecContext *avctx) |
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{ |
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return 0; |
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} |
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uint16_t getbe16(const uint8_t *p) |
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{ |
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return (p[0] << 8) | p[1]; |
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} |
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int get_nibble(const uint8_t *buf, int nibble_offset) |
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{ |
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return (buf[nibble_offset >> 1] >> ((1 - (nibble_offset & 1)) << 2)) & 0xf; |
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} |
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static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
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const uint8_t *buf, int nibble_offset, int buf_size) |
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{ |
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unsigned int v; |
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int x, y, len, color, nibble_end; |
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uint8_t *d; |
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nibble_end = buf_size * 2; |
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x = 0; |
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y = 0; |
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d = bitmap; |
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for(;;) { |
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if (nibble_offset >= nibble_end) |
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return -1; |
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v = get_nibble(buf, nibble_offset++); |
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if (v < 0x4) { |
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v = (v << 4) | get_nibble(buf, nibble_offset++); |
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if (v < 0x10) { |
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v = (v << 4) | get_nibble(buf, nibble_offset++); |
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if (v < 0x040) { |
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v = (v << 4) | get_nibble(buf, nibble_offset++); |
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if (v < 4) { |
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v |= (w - x) << 2; |
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} |
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} |
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} |
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} |
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len = v >> 2; |
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if (len > (w - x)) |
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len = (w - x); |
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color = v & 0x03; |
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memset(d + x, color, len); |
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x += len; |
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if (x >= w) { |
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y++; |
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if (y >= h) |
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break; |
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d += linesize; |
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x = 0; |
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/* byte align */ |
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nibble_offset += (nibble_offset & 1); |
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} |
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} |
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return 0; |
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} |
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static void guess_palette(uint32_t *rgba_palette, |
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uint8_t *palette, |
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uint8_t *alpha, |
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uint32_t subtitle_color) |
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{ |
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uint8_t color_used[16]; |
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int nb_opaque_colors, i, level, j, r, g, b; |
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for(i = 0; i < 4; i++) |
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rgba_palette[i] = 0; |
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memset(color_used, 0, 16); |
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nb_opaque_colors = 0; |
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for(i = 0; i < 4; i++) { |
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if (alpha[i] != 0 && !color_used[palette[i]]) { |
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color_used[palette[i]] = 1; |
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nb_opaque_colors++; |
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} |
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} |
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if (nb_opaque_colors == 0) |
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return; |
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j = 0; |
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memset(color_used, 0, 16); |
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for(i = 0; i < 4; i++) { |
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if (alpha[i] != 0) { |
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if (!color_used[palette[i]]) { |
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level = (0xff * (j + 1)) / nb_opaque_colors; |
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r = (((subtitle_color >> 16) & 0xff) * level) >> 8; |
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g = (((subtitle_color >> 8) & 0xff) * level) >> 8; |
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b = (((subtitle_color >> 0) & 0xff) * level) >> 8; |
||||
rgba_palette[i] = b | (g << 8) | (r << 16) | (0xff << 24); |
||||
color_used[palette[i]] = (i + 1); |
||||
j++; |
||||
} else { |
||||
rgba_palette[i] = rgba_palette[color_used[palette[i]] - 1]; |
||||
} |
||||
} |
||||
} |
||||
} |
||||
|
||||
static int decode_dvd_subtitles(AVSubtitle *sub_header,
|
||||
const uint8_t *buf, int buf_size) |
||||
{ |
||||
int cmd_pos, pos, cmd, x1, y1, x2, y2, offset1, offset2, next_cmd_pos; |
||||
uint8_t palette[4], alpha[4]; |
||||
int date; |
||||
|
||||
if (buf_size < 4) |
||||
return -1; |
||||
sub_header->bitmap = NULL; |
||||
sub_header->rgba_palette = NULL; |
||||
sub_header->start_display_time = 0; |
||||
sub_header->end_display_time = 0; |
||||
|
||||
cmd_pos = getbe16(buf + 2); |
||||
while ((cmd_pos + 4) < buf_size) { |
||||
date = getbe16(buf + cmd_pos); |
||||
next_cmd_pos = getbe16(buf + cmd_pos + 2); |
||||
#ifdef DEBUG |
||||
av_log(NULL, AV_LOG_INFO, "cmd_pos=0x%04x next=0x%04x date=%d\n",
|
||||
cmd_pos, next_cmd_pos, date); |
||||
#endif |
||||
pos = cmd_pos + 4; |
||||
offset1 = -1; |
||||
offset2 = -1; |
||||
x1 = y1 = x2 = y2 = 0; |
||||
while (pos < buf_size) { |
||||
cmd = buf[pos++]; |
||||
#ifdef DEBUG |
||||
av_log(NULL, AV_LOG_INFO, "cmd=%02x\n", cmd); |
||||
#endif |
||||
switch(cmd) { |
||||
case 0x00: |
||||
/* force display */ |
||||
break; |
||||
case 0x01: |
||||
/* set start date */ |
||||
sub_header->start_display_time = date * 10; |
||||
break; |
||||
case 0x02: |
||||
/* set end date */ |
||||
sub_header->end_display_time = date * 10; |
||||
break; |
||||
case 0x03: |
||||
/* set palette */ |
||||
if ((buf_size - pos) < 2) |
||||
goto fail; |
||||
palette[0] = buf[pos] >> 4; |
||||
palette[1] = buf[pos] & 0x0f; |
||||
palette[2] = buf[pos + 1] >> 4; |
||||
palette[3] = buf[pos + 1] & 0x0f; |
||||
pos += 2; |
||||
break; |
||||
case 0x04: |
||||
/* set alpha */ |
||||
if ((buf_size - pos) < 2) |
||||
goto fail; |
||||
alpha[0] = buf[pos] >> 4; |
||||
alpha[1] = buf[pos] & 0x0f; |
||||
alpha[2] = buf[pos + 1] >> 4; |
||||
alpha[3] = buf[pos + 1] & 0x0f; |
||||
pos += 2; |
||||
break; |
||||
case 0x05: |
||||
if ((buf_size - pos) < 6) |
||||
goto fail; |
||||
x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4); |
||||
x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2]; |
||||
y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4); |
||||
y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5]; |
||||
#ifdef DEBUG |
||||
av_log(NULL, AV_LOG_INFO, "x1=%d x2=%d y1=%d y2=%d\n", |
||||
x1, x2, y1, y2); |
||||
#endif |
||||
pos += 6; |
||||
break; |
||||
case 0x06: |
||||
if ((buf_size - pos) < 4) |
||||
goto fail; |
||||
offset1 = getbe16(buf + pos); |
||||
offset2 = getbe16(buf + pos + 2); |
||||
#ifdef DEBUG |
||||
av_log(NULL, AV_LOG_INFO, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2); |
||||
#endif |
||||
pos += 4; |
||||
break; |
||||
case 0xff: |
||||
default: |
||||
goto the_end; |
||||
} |
||||
} |
||||
the_end: |
||||
if (offset1 >= 0) { |
||||
int w, h; |
||||
uint8_t *bitmap; |
||||
|
||||
/* decode the bitmap */ |
||||
w = x2 - x1 + 1; |
||||
if (w < 0) |
||||
w = 0; |
||||
h = y2 - y1; |
||||
if (h < 0) |
||||
h = 0; |
||||
if (w > 0 && h > 0) { |
||||
av_freep(&sub_header->bitmap); |
||||
av_freep(&sub_header->rgba_palette); |
||||
bitmap = av_malloc(w * h); |
||||
sub_header->rgba_palette = av_malloc(4 * 4); |
||||
decode_rle(bitmap, w * 2, w, h / 2, |
||||
buf, offset1 * 2, buf_size); |
||||
decode_rle(bitmap + w, w * 2, w, h / 2, |
||||
buf, offset2 * 2, buf_size); |
||||
guess_palette(sub_header->rgba_palette,
|
||||
palette, alpha, 0xffff00); |
||||
sub_header->x = x1; |
||||
sub_header->y = y1; |
||||
sub_header->w = w; |
||||
sub_header->h = h; |
||||
sub_header->nb_colors = 4; |
||||
sub_header->linesize = w; |
||||
sub_header->bitmap = bitmap; |
||||
} |
||||
} |
||||
if (next_cmd_pos == cmd_pos) |
||||
break; |
||||
cmd_pos = next_cmd_pos; |
||||
} |
||||
if (sub_header->bitmap) |
||||
return 0; |
||||
fail: |
||||
return -1; |
||||
} |
||||
|
||||
static int is_transp(const uint8_t *buf, int pitch, int n,
|
||||
const uint8_t *transp_color) |
||||
{ |
||||
int i; |
||||
for(i = 0; i < n; i++) { |
||||
if (!transp_color[*buf]) |
||||
return 0; |
||||
buf += pitch; |
||||
} |
||||
return 1; |
||||
} |
||||
|
||||
/* return 0 if empty rectangle, 1 if non empty */ |
||||
static int find_smallest_bouding_rectangle(AVSubtitle *s) |
||||
{ |
||||
uint8_t transp_color[256]; |
||||
int y1, y2, x1, x2, y, w, h, i; |
||||
uint8_t *bitmap; |
||||
|
||||
if (s->w <= 0 || s->h <= 0) |
||||
return 0; |
||||
|
||||
memset(transp_color, 0, 256); |
||||
for(i = 0; i < s->nb_colors; i++) { |
||||
if ((s->rgba_palette[i] >> 24) == 0) |
||||
transp_color[i] = 1; |
||||
} |
||||
y1 = 0; |
||||
while (y1 < s->h && is_transp(s->bitmap + y1 * s->linesize, 1, s->w,
|
||||
transp_color)) |
||||
y1++; |
||||
if (y1 == s->h) { |
||||
av_freep(&s->bitmap); |
||||
s->w = s->h = 0; |
||||
return 0; |
||||
} |
||||
|
||||
y2 = s->h - 1; |
||||
while (y2 > 0 && is_transp(s->bitmap + y2 * s->linesize, 1, s->w,
|
||||
transp_color)) |
||||
y2--; |
||||
x1 = 0; |
||||
while (x1 < (s->w - 1) && is_transp(s->bitmap + x1, s->linesize, s->h,
|
||||
transp_color)) |
||||
x1++; |
||||
x2 = s->w - 1; |
||||
while (x2 > 0 && is_transp(s->bitmap + x2, s->linesize, s->h,
|
||||
transp_color)) |
||||
x2--; |
||||
w = x2 - x1 + 1; |
||||
h = y2 - y1 + 1; |
||||
bitmap = av_malloc(w * h); |
||||
if (!bitmap) |
||||
return 1; |
||||
for(y = 0; y < h; y++) { |
||||
memcpy(bitmap + w * y, s->bitmap + x1 + (y1 + y) * s->linesize, w); |
||||
} |
||||
av_freep(&s->bitmap); |
||||
s->bitmap = bitmap; |
||||
s->linesize = w; |
||||
s->w = w; |
||||
s->h = h; |
||||
s->x += x1; |
||||
s->y += y1; |
||||
return 1; |
||||
} |
||||
|
||||
static int dvdsub_close_decoder(AVCodecContext *avctx) |
||||
{ |
||||
return 0; |
||||
} |
||||
|
||||
#ifdef DEBUG |
||||
#undef fprintf |
||||
static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h, |
||||
uint32_t *rgba_palette) |
||||
{ |
||||
int x, y, v; |
||||
FILE *f; |
||||
|
||||
f = fopen(filename, "w"); |
||||
if (!f) { |
||||
perror(filename); |
||||
exit(1); |
||||
} |
||||
fprintf(f, "P6\n" |
||||
"%d %d\n" |
||||
"%d\n", |
||||
w, h, 255); |
||||
for(y = 0; y < h; y++) { |
||||
for(x = 0; x < w; x++) { |
||||
v = rgba_palette[bitmap[y * w + x]]; |
||||
putc((v >> 16) & 0xff, f); |
||||
putc((v >> 8) & 0xff, f); |
||||
putc((v >> 0) & 0xff, f); |
||||
} |
||||
} |
||||
fclose(f); |
||||
} |
||||
#endif |
||||
|
||||
static int dvdsub_decode(AVCodecContext *avctx, |
||||
void *data, int *data_size, |
||||
uint8_t *buf, int buf_size) |
||||
{ |
||||
AVSubtitle *sub = (void *)data; |
||||
|
||||
if (decode_dvd_subtitles(sub, buf, buf_size) < 0) { |
||||
no_subtitle: |
||||
*data_size = 0; |
||||
|
||||
return buf_size; |
||||
} |
||||
if (find_smallest_bouding_rectangle(sub) == 0) |
||||
goto no_subtitle; |
||||
|
||||
#if defined(DEBUG) |
||||
av_log(NULL, AV_LOG_INFO, "start=%d ms end =%d ms\n",
|
||||
sub->start_display_time, |
||||
sub->end_display_time); |
||||
ppm_save("/tmp/a.ppm", sub->bitmap,
|
||||
sub->w, sub->h, sub->rgba_palette); |
||||
#endif |
||||
|
||||
*data_size = 1; |
||||
return buf_size; |
||||
} |
||||
|
||||
AVCodec dvdsub_decoder = { |
||||
"dvdsub", |
||||
CODEC_TYPE_SUBTITLE, |
||||
CODEC_ID_DVD_SUBTITLE, |
||||
sizeof(DVDSubContext), |
||||
dvdsub_init_decoder, |
||||
NULL, |
||||
dvdsub_close_decoder, |
||||
dvdsub_decode, |
||||
}; |
||||
|
||||
/* parser definition */ |
||||
typedef struct DVDSubParseContext { |
||||
uint8_t *packet; |
||||
int packet_len; |
||||
int packet_index; |
||||
} DVDSubParseContext; |
||||
|
||||
static int dvdsub_parse_init(AVCodecParserContext *s) |
||||
{ |
||||
return 0; |
||||
} |
||||
|
||||
static int dvdsub_parse(AVCodecParserContext *s, |
||||
AVCodecContext *avctx, |
||||
uint8_t **poutbuf, int *poutbuf_size,
|
||||
const uint8_t *buf, int buf_size) |
||||
{ |
||||
DVDSubParseContext *pc = s->priv_data; |
||||
|
||||
if (pc->packet_index == 0) { |
||||
if (buf_size < 2) |
||||
return 0; |
||||
pc->packet_len = (buf[0] << 8) | buf[1]; |
||||
av_freep(&pc->packet); |
||||
pc->packet = av_malloc(pc->packet_len); |
||||
} |
||||
if (pc->packet) { |
||||
if (pc->packet_index + buf_size <= pc->packet_len) { |
||||
memcpy(pc->packet + pc->packet_index, buf, buf_size); |
||||
pc->packet_index += buf_size; |
||||
if (pc->packet_index >= pc->packet_len) { |
||||
*poutbuf = pc->packet; |
||||
*poutbuf_size = pc->packet_len; |
||||
pc->packet_index = 0; |
||||
return buf_size; |
||||
} |
||||
} else { |
||||
/* erroneous size */ |
||||
pc->packet_index = 0; |
||||
} |
||||
} |
||||
*poutbuf = NULL; |
||||
*poutbuf_size = 0; |
||||
return buf_size; |
||||
} |
||||
|
||||
static void dvdsub_parse_close(AVCodecParserContext *s) |
||||
{ |
||||
DVDSubParseContext *pc = s->priv_data; |
||||
av_freep(&pc->packet); |
||||
} |
||||
|
||||
AVCodecParser dvdsub_parser = { |
||||
{ CODEC_ID_DVD_SUBTITLE }, |
||||
sizeof(DVDSubParseContext), |
||||
dvdsub_parse_init, |
||||
dvdsub_parse, |
||||
dvdsub_parse_close, |
||||
}; |
||||
Loading…
Reference in new issue