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269 lines
8.1 KiB
269 lines
8.1 KiB
/* |
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* CamStudio decoder |
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* Copyright (c) 2006 Reimar Doeffinger |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg 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 FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include "avcodec.h" |
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#if CONFIG_ZLIB |
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#include <zlib.h> |
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#endif |
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#include "libavutil/lzo.h" |
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typedef struct { |
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AVFrame pic; |
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int linelen, height, bpp; |
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unsigned int decomp_size; |
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unsigned char* decomp_buf; |
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} CamStudioContext; |
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static void copy_frame_default(AVFrame *f, const uint8_t *src, int src_stride, |
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int linelen, int height) { |
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int i; |
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uint8_t *dst = f->data[0]; |
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dst += (height - 1) * f->linesize[0]; |
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for (i = height; i; i--) { |
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memcpy(dst, src, linelen); |
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src += src_stride; |
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dst -= f->linesize[0]; |
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} |
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} |
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static void add_frame_default(AVFrame *f, const uint8_t *src, int src_stride, |
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int linelen, int height) { |
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int i, j; |
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uint8_t *dst = f->data[0]; |
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dst += (height - 1) * f->linesize[0]; |
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for (i = height; i; i--) { |
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for (j = linelen; j; j--) |
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*dst++ += *src++; |
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src += src_stride - linelen; |
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dst -= f->linesize[0] + linelen; |
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} |
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} |
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#if !HAVE_BIGENDIAN |
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#define copy_frame_16(f, s, l, h) copy_frame_default(f, s, l, l, h) |
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#define copy_frame_32(f, s, l, h) copy_frame_default(f, s, l, l, h) |
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#define add_frame_16(f, s, l, h) add_frame_default(f, s, l, l, h) |
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#define add_frame_32(f, s, l, h) add_frame_default(f, s, l, l, h) |
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#else |
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static void copy_frame_16(AVFrame *f, const uint8_t *src, |
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int linelen, int height) { |
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int i, j; |
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uint8_t *dst = f->data[0]; |
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dst += (height - 1) * f->linesize[0]; |
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for (i = height; i; i--) { |
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for (j = linelen / 2; j; j--) { |
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dst[0] = src[1]; |
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dst[1] = src[0]; |
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src += 2; |
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dst += 2; |
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} |
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dst -= f->linesize[0] + linelen; |
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} |
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} |
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static void copy_frame_32(AVFrame *f, const uint8_t *src, |
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int linelen, int height) { |
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int i, j; |
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uint8_t *dst = f->data[0]; |
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dst += (height - 1) * f->linesize[0]; |
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for (i = height; i; i--) { |
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for (j = linelen / 4; j; j--) { |
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dst[0] = src[3]; |
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dst[1] = src[2]; |
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dst[2] = src[1]; |
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dst[3] = src[0]; |
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src += 4; |
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dst += 4; |
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} |
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dst -= f->linesize[0] + linelen; |
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} |
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} |
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static void add_frame_16(AVFrame *f, const uint8_t *src, |
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int linelen, int height) { |
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int i, j; |
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uint8_t *dst = f->data[0]; |
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dst += (height - 1) * f->linesize[0]; |
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for (i = height; i; i--) { |
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for (j = linelen / 2; j; j--) { |
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dst[0] += src[1]; |
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dst[1] += src[0]; |
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src += 2; |
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dst += 2; |
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} |
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dst -= f->linesize[0] + linelen; |
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} |
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} |
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static void add_frame_32(AVFrame *f, const uint8_t *src, |
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int linelen, int height) { |
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int i, j; |
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uint8_t *dst = f->data[0]; |
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dst += (height - 1) * f->linesize[0]; |
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for (i = height; i; i--) { |
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for (j = linelen / 4; j; j--) { |
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dst[0] += src[3]; |
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dst[1] += src[2]; |
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dst[2] += src[1]; |
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dst[3] += src[0]; |
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src += 4; |
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dst += 4; |
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} |
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dst -= f->linesize[0] + linelen; |
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} |
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} |
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#endif |
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static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, |
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AVPacket *avpkt) { |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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CamStudioContext *c = avctx->priv_data; |
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AVFrame *picture = data; |
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if (buf_size < 2) { |
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av_log(avctx, AV_LOG_ERROR, "coded frame too small\n"); |
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return -1; |
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} |
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if (c->pic.data[0]) |
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avctx->release_buffer(avctx, &c->pic); |
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c->pic.reference = 1; |
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c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE | |
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FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; |
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if (avctx->get_buffer(avctx, &c->pic) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
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return -1; |
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} |
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// decompress data |
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switch ((buf[0] >> 1) & 7) { |
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case 0: { // lzo compression |
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int outlen = c->decomp_size, inlen = buf_size - 2; |
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if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen)) |
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av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n"); |
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break; |
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} |
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case 1: { // zlib compression |
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#if CONFIG_ZLIB |
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unsigned long dlen = c->decomp_size; |
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if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK) |
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av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n"); |
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break; |
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#else |
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av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n"); |
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return -1; |
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#endif |
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} |
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default: |
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av_log(avctx, AV_LOG_ERROR, "unknown compression\n"); |
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return -1; |
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} |
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// flip upside down, add difference frame |
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if (buf[0] & 1) { // keyframe |
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c->pic.pict_type = FF_I_TYPE; |
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c->pic.key_frame = 1; |
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switch (c->bpp) { |
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case 16: |
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copy_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height); |
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break; |
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case 32: |
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copy_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height); |
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break; |
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default: |
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copy_frame_default(&c->pic, c->decomp_buf, FFALIGN(c->linelen, 4), |
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c->linelen, c->height); |
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} |
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} else { |
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c->pic.pict_type = FF_P_TYPE; |
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c->pic.key_frame = 0; |
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switch (c->bpp) { |
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case 16: |
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add_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height); |
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break; |
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case 32: |
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add_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height); |
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break; |
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default: |
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add_frame_default(&c->pic, c->decomp_buf, FFALIGN(c->linelen, 4), |
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c->linelen, c->height); |
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} |
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} |
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*picture = c->pic; |
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*data_size = sizeof(AVFrame); |
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return buf_size; |
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} |
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static av_cold int decode_init(AVCodecContext *avctx) { |
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CamStudioContext *c = avctx->priv_data; |
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int stride; |
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switch (avctx->bits_per_coded_sample) { |
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case 16: avctx->pix_fmt = PIX_FMT_RGB555; break; |
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case 24: avctx->pix_fmt = PIX_FMT_BGR24; break; |
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case 32: avctx->pix_fmt = PIX_FMT_RGB32; break; |
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default: |
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av_log(avctx, AV_LOG_ERROR, |
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"CamStudio codec error: invalid depth %i bpp\n", |
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avctx->bits_per_coded_sample); |
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return 1; |
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} |
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c->bpp = avctx->bits_per_coded_sample; |
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c->pic.data[0] = NULL; |
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c->linelen = avctx->width * avctx->bits_per_coded_sample / 8; |
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c->height = avctx->height; |
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stride = c->linelen; |
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if (avctx->bits_per_coded_sample == 24) |
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stride = FFALIGN(stride, 4); |
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c->decomp_size = c->height * stride; |
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c->decomp_buf = av_malloc(c->decomp_size + AV_LZO_OUTPUT_PADDING); |
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if (!c->decomp_buf) { |
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av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); |
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return 1; |
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} |
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return 0; |
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} |
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static av_cold int decode_end(AVCodecContext *avctx) { |
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CamStudioContext *c = avctx->priv_data; |
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av_freep(&c->decomp_buf); |
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if (c->pic.data[0]) |
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avctx->release_buffer(avctx, &c->pic); |
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return 0; |
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} |
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AVCodec cscd_decoder = { |
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"camstudio", |
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AVMEDIA_TYPE_VIDEO, |
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CODEC_ID_CSCD, |
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sizeof(CamStudioContext), |
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decode_init, |
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NULL, |
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decode_end, |
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decode_frame, |
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CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("CamStudio"), |
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}; |
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