From 44aa9771c98be64e33af605797c08e86ccfdfef0 Mon Sep 17 00:00:00 2001 From: Kostya Shishkov Date: Thu, 18 Sep 2008 05:20:54 +0000 Subject: [PATCH] Factorize out code used for MS RLE format decoding in different decoders. Originally committed as revision 15356 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/Makefile | 6 +- libavcodec/aasc.c | 75 +-------------- libavcodec/msrle.c | 206 ++-------------------------------------- libavcodec/msrledec.c | 254 ++++++++++++++++++++++++++++++++++++++++++++++++++ libavcodec/msrledec.h | 40 ++++++++ libavcodec/tscc.c | 115 +---------------------- 6 files changed, 309 insertions(+), 387 deletions(-) create mode 100644 libavcodec/msrledec.c create mode 100644 libavcodec/msrledec.h diff --git a/libavcodec/Makefile b/libavcodec/Makefile index e987ddd..d91185e 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -26,7 +26,7 @@ HEADERS = avcodec.h opt.h OBJS-$(CONFIG_ENCODERS) += faandct.o jfdctfst.o jfdctint.o OBJS-$(CONFIG_AAC_DECODER) += aac.o aactab.o mdct.o fft.o -OBJS-$(CONFIG_AASC_DECODER) += aasc.o +OBJS-$(CONFIG_AASC_DECODER) += aasc.o msrledec.o OBJS-$(CONFIG_AC3_DECODER) += eac3dec.o ac3dec.o ac3tab.o ac3dec_data.o ac3.o mdct.o fft.o OBJS-$(CONFIG_AC3_ENCODER) += ac3enc.o ac3tab.o ac3.o OBJS-$(CONFIG_ALAC_DECODER) += alac.o @@ -136,7 +136,7 @@ OBJS-$(CONFIG_MSMPEG4V2_DECODER) += msmpeg4.o msmpeg4data.o h263dec.o h263 OBJS-$(CONFIG_MSMPEG4V2_ENCODER) += msmpeg4.o msmpeg4data.o mpegvideo_enc.o motion_est.o ratecontrol.o h263.o mpeg12data.o mpegvideo.o error_resilience.o OBJS-$(CONFIG_MSMPEG4V3_DECODER) += msmpeg4.o msmpeg4data.o h263dec.o h263.o mpeg12data.o mpegvideo.o error_resilience.o OBJS-$(CONFIG_MSMPEG4V3_ENCODER) += msmpeg4.o msmpeg4data.o mpegvideo_enc.o motion_est.o ratecontrol.o h263.o mpeg12data.o mpegvideo.o error_resilience.o -OBJS-$(CONFIG_MSRLE_DECODER) += msrle.o +OBJS-$(CONFIG_MSRLE_DECODER) += msrle.o msrledec.o OBJS-$(CONFIG_MSVIDEO1_DECODER) += msvideo1.o OBJS-$(CONFIG_MSZH_DECODER) += lcldec.o OBJS-$(CONFIG_NELLYMOSER_DECODER) += nellymoserdec.o nellymoser.o mdct.o fft.o @@ -197,7 +197,7 @@ OBJS-$(CONFIG_TIFF_ENCODER) += tiffenc.o rle.o lzwenc.o OBJS-$(CONFIG_TRUEMOTION1_DECODER) += truemotion1.o OBJS-$(CONFIG_TRUEMOTION2_DECODER) += truemotion2.o OBJS-$(CONFIG_TRUESPEECH_DECODER) += truespeech.o -OBJS-$(CONFIG_TSCC_DECODER) += tscc.o +OBJS-$(CONFIG_TSCC_DECODER) += tscc.o msrledec.o OBJS-$(CONFIG_TTA_DECODER) += tta.o OBJS-$(CONFIG_TXD_DECODER) += txd.o s3tc.o OBJS-$(CONFIG_ULTI_DECODER) += ulti.o diff --git a/libavcodec/aasc.c b/libavcodec/aasc.c index 0117201..77162f9 100644 --- a/libavcodec/aasc.c +++ b/libavcodec/aasc.c @@ -30,6 +30,7 @@ #include "avcodec.h" #include "dsputil.h" +#include "msrledec.h" typedef struct AascContext { AVCodecContext *avctx; @@ -61,13 +62,6 @@ static int aasc_decode_frame(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { AascContext *s = avctx->priv_data; - int stream_ptr = 4; - unsigned char rle_code; - unsigned char stream_byte; - int pixel_ptr = 0; - int row_dec, row_ptr; - int frame_size; - int i; s->frame.reference = 1; s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; @@ -76,72 +70,7 @@ static int aasc_decode_frame(AVCodecContext *avctx, return -1; } - row_dec = s->frame.linesize[0]; - row_ptr = (s->avctx->height - 1) * row_dec; - frame_size = row_dec * s->avctx->height; - - while (row_ptr >= 0) { - FETCH_NEXT_STREAM_BYTE(); - rle_code = stream_byte; - if (rle_code == 0) { - /* fetch the next byte to see how to handle escape code */ - FETCH_NEXT_STREAM_BYTE(); - if (stream_byte == 0) { - /* line is done, goto the next one */ - row_ptr -= row_dec; - pixel_ptr = 0; - } else if (stream_byte == 1) { - /* decode is done */ - break; - } else if (stream_byte == 2) { - /* reposition frame decode coordinates */ - FETCH_NEXT_STREAM_BYTE(); - pixel_ptr += stream_byte; - FETCH_NEXT_STREAM_BYTE(); - row_ptr -= stream_byte * row_dec; - } else { - /* copy pixels from encoded stream */ - if ((pixel_ptr + stream_byte > avctx->width * 3) || - (row_ptr < 0)) { - av_log(s->avctx, AV_LOG_ERROR, " AASC: frame ptr just went out of bounds (copy1)\n"); - break; - } - - rle_code = stream_byte; - if (stream_ptr + rle_code > buf_size) { - av_log(s->avctx, AV_LOG_ERROR, " AASC: stream ptr just went out of bounds (copy2)\n"); - break; - } - - for (i = 0; i < rle_code; i++) { - FETCH_NEXT_STREAM_BYTE(); - s->frame.data[0][row_ptr + pixel_ptr] = stream_byte; - pixel_ptr++; - } - if (rle_code & 1) - stream_ptr++; - } - } else { - /* decode a run of data */ - if ((pixel_ptr + rle_code > avctx->width * 3) || - (row_ptr < 0)) { - av_log(s->avctx, AV_LOG_ERROR, " AASC: frame ptr just went out of bounds (run1)\n"); - break; - } - - FETCH_NEXT_STREAM_BYTE(); - - while(rle_code--) { - s->frame.data[0][row_ptr + pixel_ptr] = stream_byte; - pixel_ptr++; - } - } - } - - /* one last sanity check on the way out */ - if (stream_ptr < buf_size) - av_log(s->avctx, AV_LOG_ERROR, " AASC: ended frame decode with bytes left over (%d < %d)\n", - stream_ptr, buf_size); + ff_msrle_decode(avctx, &s->frame, 8, buf, buf_size); *data_size = sizeof(AVFrame); *(AVFrame*)data = s->frame; diff --git a/libavcodec/msrle.c b/libavcodec/msrle.c index 4ea00f6..0fd0366 100644 --- a/libavcodec/msrle.c +++ b/libavcodec/msrle.c @@ -38,6 +38,7 @@ #include "avcodec.h" #include "dsputil.h" +#include "msrledec.h" typedef struct MsrleContext { AVCodecContext *avctx; @@ -48,194 +49,6 @@ typedef struct MsrleContext { } MsrleContext; -#define FETCH_NEXT_STREAM_BYTE() \ - if (stream_ptr >= s->size) \ - { \ - av_log(s->avctx, AV_LOG_ERROR, " MS RLE: stream ptr just went out of bounds (1)\n"); \ - return; \ - } \ - stream_byte = s->buf[stream_ptr++]; - -static void msrle_decode_pal4(MsrleContext *s) -{ - int stream_ptr = 0; - unsigned char rle_code; - unsigned char extra_byte, odd_pixel; - unsigned char stream_byte; - int pixel_ptr = 0; - int row_dec = s->frame.linesize[0]; - int row_ptr = (s->avctx->height - 1) * row_dec; - int frame_size = row_dec * s->avctx->height; - int i; - - /* make the palette available */ - memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE); - if (s->avctx->palctrl->palette_changed) { - s->frame.palette_has_changed = 1; - s->avctx->palctrl->palette_changed = 0; - } - - while (row_ptr >= 0) { - FETCH_NEXT_STREAM_BYTE(); - rle_code = stream_byte; - if (rle_code == 0) { - /* fetch the next byte to see how to handle escape code */ - FETCH_NEXT_STREAM_BYTE(); - if (stream_byte == 0) { - /* line is done, goto the next one */ - row_ptr -= row_dec; - pixel_ptr = 0; - } else if (stream_byte == 1) { - /* decode is done */ - return; - } else if (stream_byte == 2) { - /* reposition frame decode coordinates */ - FETCH_NEXT_STREAM_BYTE(); - pixel_ptr += stream_byte; - FETCH_NEXT_STREAM_BYTE(); - row_ptr -= stream_byte * row_dec; - } else { - // copy pixels from encoded stream - odd_pixel = stream_byte & 1; - rle_code = (stream_byte + 1) / 2; - extra_byte = rle_code & 0x01; - if ((row_ptr + pixel_ptr + stream_byte > frame_size) || - (row_ptr < 0)) { - av_log(s->avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (1)\n"); - return; - } - - for (i = 0; i < rle_code; i++) { - if (pixel_ptr >= s->avctx->width) - break; - FETCH_NEXT_STREAM_BYTE(); - s->frame.data[0][row_ptr + pixel_ptr] = stream_byte >> 4; - pixel_ptr++; - if (i + 1 == rle_code && odd_pixel) - break; - if (pixel_ptr >= s->avctx->width) - break; - s->frame.data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F; - pixel_ptr++; - } - - // if the RLE code is odd, skip a byte in the stream - if (extra_byte) - stream_ptr++; - } - } else { - // decode a run of data - if ((row_ptr + pixel_ptr + stream_byte > frame_size) || - (row_ptr < 0)) { - av_log(s->avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (1)\n"); - return; - } - FETCH_NEXT_STREAM_BYTE(); - for (i = 0; i < rle_code; i++) { - if (pixel_ptr >= s->avctx->width) - break; - if ((i & 1) == 0) - s->frame.data[0][row_ptr + pixel_ptr] = stream_byte >> 4; - else - s->frame.data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F; - pixel_ptr++; - } - } - } - - /* one last sanity check on the way out */ - if (stream_ptr < s->size) - av_log(s->avctx, AV_LOG_ERROR, " MS RLE: ended frame decode with bytes left over (%d < %d)\n", - stream_ptr, s->size); -} - - - -static void msrle_decode_pal8(MsrleContext *s) -{ - int stream_ptr = 0; - unsigned char rle_code; - unsigned char extra_byte; - unsigned char stream_byte; - int pixel_ptr = 0; - int row_dec = s->frame.linesize[0]; - int row_ptr = (s->avctx->height - 1) * row_dec; - int frame_size = row_dec * s->avctx->height; - - /* make the palette available */ - memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE); - if (s->avctx->palctrl->palette_changed) { - s->frame.palette_has_changed = 1; - s->avctx->palctrl->palette_changed = 0; - } - - while (row_ptr >= 0) { - FETCH_NEXT_STREAM_BYTE(); - rle_code = stream_byte; - if (rle_code == 0) { - /* fetch the next byte to see how to handle escape code */ - FETCH_NEXT_STREAM_BYTE(); - if (stream_byte == 0) { - /* line is done, goto the next one */ - row_ptr -= row_dec; - pixel_ptr = 0; - } else if (stream_byte == 1) { - /* decode is done */ - return; - } else if (stream_byte == 2) { - /* reposition frame decode coordinates */ - FETCH_NEXT_STREAM_BYTE(); - pixel_ptr += stream_byte; - FETCH_NEXT_STREAM_BYTE(); - row_ptr -= stream_byte * row_dec; - } else { - /* copy pixels from encoded stream */ - if ((row_ptr + pixel_ptr + stream_byte > frame_size) || - (row_ptr < 0)) { - av_log(s->avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (1)\n"); - return; - } - - rle_code = stream_byte; - extra_byte = stream_byte & 0x01; - if (stream_ptr + rle_code + extra_byte > s->size) { - av_log(s->avctx, AV_LOG_ERROR, " MS RLE: stream ptr just went out of bounds (2)\n"); - return; - } - - while (rle_code--) { - FETCH_NEXT_STREAM_BYTE(); - s->frame.data[0][row_ptr + pixel_ptr] = stream_byte; - pixel_ptr++; - } - - /* if the RLE code is odd, skip a byte in the stream */ - if (extra_byte) - stream_ptr++; - } - } else { - /* decode a run of data */ - if ((row_ptr + pixel_ptr + stream_byte > frame_size) || - (row_ptr < 0)) { - av_log(s->avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (2)\n"); - return; - } - - FETCH_NEXT_STREAM_BYTE(); - - while(rle_code--) { - s->frame.data[0][row_ptr + pixel_ptr] = stream_byte; - pixel_ptr++; - } - } - } - - /* one last sanity check on the way out */ - if (stream_ptr < s->size) - av_log(s->avctx, AV_LOG_ERROR, " MS RLE: ended frame decode with bytes left over (%d < %d)\n", - stream_ptr, s->size); -} - static av_cold int msrle_decode_init(AVCodecContext *avctx) { MsrleContext *s = avctx->priv_data; @@ -264,18 +77,15 @@ static int msrle_decode_frame(AVCodecContext *avctx, return -1; } - switch (avctx->bits_per_coded_sample) { - case 8: - msrle_decode_pal8(s); - break; - case 4: - msrle_decode_pal4(s); - break; - default: - av_log(avctx, AV_LOG_ERROR, "Don't know how to decode depth %u.\n", - avctx->bits_per_coded_sample); + /* make the palette available */ + memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE); + if (s->avctx->palctrl->palette_changed) { + s->frame.palette_has_changed = 1; + s->avctx->palctrl->palette_changed = 0; } + ff_msrle_decode(avctx, &s->frame, avctx->bits_per_coded_sample, buf, buf_size); + *data_size = sizeof(AVFrame); *(AVFrame*)data = s->frame; diff --git a/libavcodec/msrledec.c b/libavcodec/msrledec.c new file mode 100644 index 0000000..f44b8b6 --- /dev/null +++ b/libavcodec/msrledec.c @@ -0,0 +1,254 @@ +/* + * Micrsoft RLE Decoder + * Copyright (C) 2008 Konstantin Shishkov + * + * 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 + */ + +/** + * @file msrledec.c + * MS RLE Decoder based on decoder by Mike Melanson and my own for TSCC + * For more information about the MS RLE format, visit: + * http://www.multimedia.cx/msrle.txt + */ + +#include "avcodec.h" + +#define FETCH_NEXT_STREAM_BYTE() \ + if (stream_ptr >= data_size) \ + { \ + av_log(avctx, AV_LOG_ERROR, " MS RLE: stream ptr just went out of bounds (1)\n"); \ + return -1; \ + } \ + stream_byte = data[stream_ptr++]; + +static int msrle_decode_pal4(AVCodecContext *avctx, AVPicture *pic, + const uint8_t *data, int data_size) +{ + int stream_ptr = 0; + unsigned char rle_code; + unsigned char extra_byte, odd_pixel; + unsigned char stream_byte; + int pixel_ptr = 0; + int row_dec = pic->linesize[0]; + int row_ptr = (avctx->height - 1) * row_dec; + int frame_size = row_dec * avctx->height; + int i; + + while (row_ptr >= 0) { + FETCH_NEXT_STREAM_BYTE(); + rle_code = stream_byte; + if (rle_code == 0) { + /* fetch the next byte to see how to handle escape code */ + FETCH_NEXT_STREAM_BYTE(); + if (stream_byte == 0) { + /* line is done, goto the next one */ + row_ptr -= row_dec; + pixel_ptr = 0; + } else if (stream_byte == 1) { + /* decode is done */ + return 0; + } else if (stream_byte == 2) { + /* reposition frame decode coordinates */ + FETCH_NEXT_STREAM_BYTE(); + pixel_ptr += stream_byte; + FETCH_NEXT_STREAM_BYTE(); + row_ptr -= stream_byte * row_dec; + } else { + // copy pixels from encoded stream + odd_pixel = stream_byte & 1; + rle_code = (stream_byte + 1) / 2; + extra_byte = rle_code & 0x01; + if ((row_ptr + pixel_ptr + stream_byte > frame_size) || + (row_ptr < 0)) { + av_log(avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (1)\n"); + return -1; + } + + for (i = 0; i < rle_code; i++) { + if (pixel_ptr >= avctx->width) + break; + FETCH_NEXT_STREAM_BYTE(); + pic->data[0][row_ptr + pixel_ptr] = stream_byte >> 4; + pixel_ptr++; + if (i + 1 == rle_code && odd_pixel) + break; + if (pixel_ptr >= avctx->width) + break; + pic->data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F; + pixel_ptr++; + } + + // if the RLE code is odd, skip a byte in the stream + if (extra_byte) + stream_ptr++; + } + } else { + // decode a run of data + if ((row_ptr + pixel_ptr + stream_byte > frame_size) || + (row_ptr < 0)) { + av_log(avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (1)\n"); + return -1; + } + FETCH_NEXT_STREAM_BYTE(); + for (i = 0; i < rle_code; i++) { + if (pixel_ptr >= avctx->width) + break; + if ((i & 1) == 0) + pic->data[0][row_ptr + pixel_ptr] = stream_byte >> 4; + else + pic->data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F; + pixel_ptr++; + } + } + } + + /* one last sanity check on the way out */ + if (stream_ptr < data_size) { + av_log(avctx, AV_LOG_ERROR, " MS RLE: ended frame decode with bytes left over (%d < %d)\n", + stream_ptr, data_size); + return -1; + } + + return 0; +} + + +static int msrle_decode_8_16_24_32(AVCodecContext *avctx, AVPicture *pic, int depth, + const uint8_t *data, int srcsize) +{ + uint8_t *output, *output_end; + const uint8_t* src = data; + int p1, p2, line=avctx->height, pos=0, i; + uint16_t pix16; + uint32_t pix32; + + output = pic->data[0] + (avctx->height - 1) * pic->linesize[0]; + output_end = pic->data[0] + (avctx->height) * pic->linesize[0]; + while(src < data + srcsize) { + p1 = *src++; + if(p1 == 0) { //Escape code + p2 = *src++; + if(p2 == 0) { //End-of-line + output = pic->data[0] + (--line) * pic->linesize[0]; + if (line < 0) + return -1; + pos = 0; + continue; + } else if(p2 == 1) { //End-of-picture + return 0; + } else if(p2 == 2) { //Skip + p1 = *src++; + p2 = *src++; + line -= p2; + if (line < 0) + return -1; + pos += p1; + output = pic->data[0] + line * pic->linesize[0] + pos * (depth >> 3); + continue; + } + // Copy data + if (output + p2 * (depth >> 3) > output_end) { + src += p2 * (depth >> 3); + continue; + } + if ((depth == 8) || (depth == 24)) { + for(i = 0; i < p2 * (depth >> 3); i++) { + *output++ = *src++; + } + // RLE8 copy is actually padded - and runs are not! + if(depth == 8 && (p2 & 1)) { + src++; + } + } else if (depth == 16) { + for(i = 0; i < p2; i++) { + pix16 = AV_RL16(src); + src += 2; + *(uint16_t*)output = pix16; + output += 2; + } + } else if (depth == 32) { + for(i = 0; i < p2; i++) { + pix32 = AV_RL32(src); + src += 4; + *(uint32_t*)output = pix32; + output += 4; + } + } + pos += p2; + } else { //Run of pixels + int pix[4]; //original pixel + switch(depth){ + case 8: pix[0] = *src++; + break; + case 16: pix16 = AV_RL16(src); + src += 2; + *(uint16_t*)pix = pix16; + break; + case 24: pix[0] = *src++; + pix[1] = *src++; + pix[2] = *src++; + break; + case 32: pix32 = AV_RL32(src); + src += 4; + *(uint32_t*)pix = pix32; + break; + } + if (output + p1 * (depth >> 3) > output_end) + continue; + for(i = 0; i < p1; i++) { + switch(depth){ + case 8: *output++ = pix[0]; + break; + case 16: *(uint16_t*)output = pix16; + output += 2; + break; + case 24: *output++ = pix[0]; + *output++ = pix[1]; + *output++ = pix[2]; + break; + case 32: *(uint32_t*)output = pix32; + output += 4; + break; + } + } + pos += p1; + } + } + + av_log(avctx, AV_LOG_WARNING, "MS RLE warning: no End-of-picture code\n"); + return 0; +} + + +int ff_msrle_decode(AVCodecContext *avctx, AVPicture *pic, int depth, + const uint8_t* data, int data_size) +{ + switch(depth){ + case 4: + return msrle_decode_pal4(avctx, pic, data, data_size); + case 8: + case 16: + case 24: + case 32: + return msrle_decode_8_16_24_32(avctx, pic, depth, data, data_size); + default: + av_log(avctx, AV_LOG_ERROR, "Unknown depth %d\n", depth); + return -1; + } +} + diff --git a/libavcodec/msrledec.h b/libavcodec/msrledec.h new file mode 100644 index 0000000..b6a3231 --- /dev/null +++ b/libavcodec/msrledec.h @@ -0,0 +1,40 @@ +/* + * Micrsoft RLE Decoder + * Copyright (C) 2008 Konstantin Shishkov + * + * 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 + */ + +#ifndef AVCODEC_MSRLEDEC_H +#define AVCODEC_MSRLEDEC_H + +#include "avcodec.h" + +/** + * decode stream in MS RLE format into frame + * + * @param avctx codec context + * @param pic destination frame + * @param depth bit depth + * @param data input stream + * @param data_size input size + */ +int ff_msrle_decode(AVCodecContext *avctx, AVPicture *pic, int depth, + const uint8_t* data, int data_size); + +#endif /* AVCODEC_MSRLEDEC_H */ + diff --git a/libavcodec/tscc.c b/libavcodec/tscc.c index 51f0185..d404719 100644 --- a/libavcodec/tscc.c +++ b/libavcodec/tscc.c @@ -39,6 +39,7 @@ #include #include "avcodec.h" +#include "msrledec.h" #ifdef CONFIG_ZLIB #include @@ -67,118 +68,6 @@ typedef struct TsccContext { /* * - * Decode RLE - almost identical to Windows BMP RLE8 - * and enhanced to bigger color depths - * - */ - -static int decode_rle(CamtasiaContext *c, unsigned int srcsize) -{ - unsigned char *src = c->decomp_buf; - unsigned char *output, *output_end; - int p1, p2, line=c->height, pos=0, i; - uint16_t pix16; - uint32_t pix32; - - output = c->pic.data[0] + (c->height - 1) * c->pic.linesize[0]; - output_end = c->pic.data[0] + (c->height) * c->pic.linesize[0]; - while(src < c->decomp_buf + srcsize) { - p1 = *src++; - if(p1 == 0) { //Escape code - p2 = *src++; - if(p2 == 0) { //End-of-line - output = c->pic.data[0] + (--line) * c->pic.linesize[0]; - if (line < 0) - return -1; - pos = 0; - continue; - } else if(p2 == 1) { //End-of-picture - return 0; - } else if(p2 == 2) { //Skip - p1 = *src++; - p2 = *src++; - line -= p2; - if (line < 0) - return -1; - pos += p1; - output = c->pic.data[0] + line * c->pic.linesize[0] + pos * (c->bpp / 8); - continue; - } - // Copy data - if (output + p2 * (c->bpp / 8) > output_end) { - src += p2 * (c->bpp / 8); - continue; - } - if ((c->bpp == 8) || (c->bpp == 24)) { - for(i = 0; i < p2 * (c->bpp / 8); i++) { - *output++ = *src++; - } - // RLE8 copy is actually padded - and runs are not! - if(c->bpp == 8 && (p2 & 1)) { - src++; - } - } else if (c->bpp == 16) { - for(i = 0; i < p2; i++) { - pix16 = AV_RL16(src); - src += 2; - *(uint16_t*)output = pix16; - output += 2; - } - } else if (c->bpp == 32) { - for(i = 0; i < p2; i++) { - pix32 = AV_RL32(src); - src += 4; - *(uint32_t*)output = pix32; - output += 4; - } - } - pos += p2; - } else { //Run of pixels - int pix[4]; //original pixel - switch(c->bpp){ - case 8: pix[0] = *src++; - break; - case 16: pix16 = AV_RL16(src); - src += 2; - *(uint16_t*)pix = pix16; - break; - case 24: pix[0] = *src++; - pix[1] = *src++; - pix[2] = *src++; - break; - case 32: pix32 = AV_RL32(src); - src += 4; - *(uint32_t*)pix = pix32; - break; - } - if (output + p1 * (c->bpp / 8) > output_end) - continue; - for(i = 0; i < p1; i++) { - switch(c->bpp){ - case 8: *output++ = pix[0]; - break; - case 16: *(uint16_t*)output = pix16; - output += 2; - break; - case 24: *output++ = pix[0]; - *output++ = pix[1]; - *output++ = pix[2]; - break; - case 32: *(uint32_t*)output = pix32; - output += 4; - break; - } - } - pos += p1; - } - } - - av_log(c->avctx, AV_LOG_ERROR, "Camtasia warning: no End-of-picture code\n"); - return 1; -} - -/* - * * Decode a frame * */ @@ -223,7 +112,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, const if(zret != Z_DATA_ERROR) - decode_rle(c, c->zstream.avail_out); + ff_msrle_decode(avctx, &c->pic, c->bpp, c->decomp_buf, c->zstream.avail_out); /* make the palette available on the way out */ if (c->avctx->pix_fmt == PIX_FMT_PAL8) { -- 2.7.4