libavcodec/cscd.c - third_party/ffmpeg - Git at Google

 /*
  * CamStudio decoder
  * Copyright (c) 2006 Reimar Doeffinger
  *
  * 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 <stdio.h>
 #include <stdlib.h>

 #include "avcodec.h"

 #if CONFIG_ZLIB
 #include <zlib.h>
 #endif
 #include "libavutil/lzo.h"

 typedef struct {
     AVFrame pic;
     int linelen, height, bpp;
     unsigned int decomp_size;
     unsigned char* decomp_buf;
 } CamStudioContext;

 static void copy_frame_default(AVFrame *f, const uint8_t *src, int src_stride,
                                int linelen, int height) {
     int i;
     uint8_t *dst = f->data[0];
     dst += (height - 1) * f->linesize[0];
     for (i = height; i; i--) {
         memcpy(dst, src, linelen);
         src += src_stride;
         dst -= f->linesize[0];
     }
 }

 static void add_frame_default(AVFrame *f, const uint8_t *src, int src_stride,
                               int linelen, int height) {
     int i, j;
     uint8_t *dst = f->data[0];
     dst += (height - 1) * f->linesize[0];
     for (i = height; i; i--) {
         for (j = linelen; j; j--)
             *dst++ += *src++;
         src += src_stride - linelen;
         dst -= f->linesize[0] + linelen;
     }
 }

 #if !HAVE_BIGENDIAN
 #define copy_frame_16(f, s, l, h) copy_frame_default(f, s, l, l, h)
 #define copy_frame_32(f, s, l, h) copy_frame_default(f, s, l, l, h)
 #define add_frame_16(f, s, l, h) add_frame_default(f, s, l, l, h)
 #define add_frame_32(f, s, l, h) add_frame_default(f, s, l, l, h)
 #else
 static void copy_frame_16(AVFrame *f, const uint8_t *src,
                           int linelen, int height) {
     int i, j;
     uint8_t *dst = f->data[0];
     dst += (height - 1) * f->linesize[0];
     for (i = height; i; i--) {
         for (j = linelen / 2; j; j--) {
           dst[0] = src[1];
           dst[1] = src[0];
           src += 2;
           dst += 2;
         }
         dst -= f->linesize[0] + linelen;
     }
 }

 static void copy_frame_32(AVFrame *f, const uint8_t *src,
                           int linelen, int height) {
     int i, j;
     uint8_t *dst = f->data[0];
     dst += (height - 1) * f->linesize[0];
     for (i = height; i; i--) {
         for (j = linelen / 4; j; j--) {
           dst[0] = src[3];
           dst[1] = src[2];
           dst[2] = src[1];
           dst[3] = src[0];
           src += 4;
           dst += 4;
         }
         dst -= f->linesize[0] + linelen;
     }
 }

 static void add_frame_16(AVFrame *f, const uint8_t *src,
                          int linelen, int height) {
     int i, j;
     uint8_t *dst = f->data[0];
     dst += (height - 1) * f->linesize[0];
     for (i = height; i; i--) {
         for (j = linelen / 2; j; j--) {
           dst[0] += src[1];
           dst[1] += src[0];
           src += 2;
           dst += 2;
         }
         dst -= f->linesize[0] + linelen;
     }
 }

 static void add_frame_32(AVFrame *f, const uint8_t *src,
                          int linelen, int height) {
     int i, j;
     uint8_t *dst = f->data[0];
     dst += (height - 1) * f->linesize[0];
     for (i = height; i; i--) {
         for (j = linelen / 4; j; j--) {
           dst[0] += src[3];
           dst[1] += src[2];
           dst[2] += src[1];
           dst[3] += src[0];
           src += 4;
           dst += 4;
         }
         dst -= f->linesize[0] + linelen;
     }
 }
 #endif

 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
                         AVPacket *avpkt) {
     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;
     CamStudioContext *c = avctx->priv_data;
     AVFrame *picture = data;

     if (buf_size < 2) {
         av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
         return -1;
     }

     if (c->pic.data[0])
         avctx->release_buffer(avctx, &c->pic);
     c->pic.reference = 3;
     c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
                           FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
     if (avctx->get_buffer(avctx, &c->pic) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return -1;
     }

     // decompress data
     switch ((buf[0] >> 1) & 7) {
         case 0: { // lzo compression
             int outlen = c->decomp_size, inlen = buf_size - 2;
             if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen))
                 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
             break;
         }
         case 1: { // zlib compression
 #if CONFIG_ZLIB
             unsigned long dlen = c->decomp_size;
             if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK)
                 av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
             break;
 #else
             av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n");
             return -1;
 #endif
         }
         default:
             av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
             return -1;
     }

     // flip upside down, add difference frame
     if (buf[0] & 1) { // keyframe
         c->pic.pict_type = AV_PICTURE_TYPE_I;
         c->pic.key_frame = 1;
         switch (c->bpp) {
           case 16:
               copy_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height);
               break;
           case 32:
               copy_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
               break;
           default:
               copy_frame_default(&c->pic, c->decomp_buf, FFALIGN(c->linelen, 4),
                                  c->linelen, c->height);
         }
     } else {
         c->pic.pict_type = AV_PICTURE_TYPE_P;
         c->pic.key_frame = 0;
         switch (c->bpp) {
           case 16:
               add_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height);
               break;
           case 32:
               add_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
               break;
           default:
               add_frame_default(&c->pic, c->decomp_buf, FFALIGN(c->linelen, 4),
                                 c->linelen, c->height);
         }
     }

     *picture = c->pic;
     *data_size = sizeof(AVFrame);
     return buf_size;
 }

 static av_cold int decode_init(AVCodecContext *avctx) {
     CamStudioContext *c = avctx->priv_data;
     int stride;
     switch (avctx->bits_per_coded_sample) {
         case 16: avctx->pix_fmt = PIX_FMT_RGB555; break;
         case 24: avctx->pix_fmt = PIX_FMT_BGR24; break;
         case 32: avctx->pix_fmt = PIX_FMT_RGB32; break;
         default:
             av_log(avctx, AV_LOG_ERROR,
                    "CamStudio codec error: invalid depth %i bpp\n",
                    avctx->bits_per_coded_sample);
             return AVERROR_INVALIDDATA;
     }
     c->bpp = avctx->bits_per_coded_sample;
     avcodec_get_frame_defaults(&c->pic);
     c->pic.data[0] = NULL;
     c->linelen = avctx->width * avctx->bits_per_coded_sample / 8;
     c->height = avctx->height;
     stride = c->linelen;
     if (avctx->bits_per_coded_sample == 24)
         stride = FFALIGN(stride, 4);
     c->decomp_size = c->height * stride;
     c->decomp_buf = av_malloc(c->decomp_size + AV_LZO_OUTPUT_PADDING);
     if (!c->decomp_buf) {
         av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
         return AVERROR(ENOMEM);
     }
     return 0;
 }

 static av_cold int decode_end(AVCodecContext *avctx) {
     CamStudioContext *c = avctx->priv_data;
     av_freep(&c->decomp_buf);
     if (c->pic.data[0])
         avctx->release_buffer(avctx, &c->pic);
     return 0;
 }

 AVCodec ff_cscd_decoder = {
     .name           = "camstudio",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_CSCD,
     .priv_data_size = sizeof(CamStudioContext),
     .init           = decode_init,
     .close          = decode_end,
     .decode         = decode_frame,
     .capabilities   = CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("CamStudio"),
 };
	/*
	* CamStudio decoder
	* Copyright (c) 2006 Reimar Doeffinger
	*
	* 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 <stdio.h>
	#include <stdlib.h>

	#include "avcodec.h"

	#if CONFIG_ZLIB
	#include <zlib.h>
	#endif
	#include "libavutil/lzo.h"

	typedef struct {
	AVFrame pic;
	int linelen, height, bpp;
	unsigned int decomp_size;
	unsigned char* decomp_buf;
	} CamStudioContext;

	static void copy_frame_default(AVFrame f, const uint8_t src, int src_stride,
	int linelen, int height) {
	int i;
	uint8_t *dst = f->data[0];
	dst += (height - 1) * f->linesize[0];
	for (i = height; i; i--) {
	memcpy(dst, src, linelen);
	src += src_stride;
	dst -= f->linesize[0];
	}
	}

	static void add_frame_default(AVFrame f, const uint8_t src, int src_stride,
	int linelen, int height) {
	int i, j;
	uint8_t *dst = f->data[0];
	dst += (height - 1) * f->linesize[0];
	for (i = height; i; i--) {
	for (j = linelen; j; j--)
	dst++ += src++;
	src += src_stride - linelen;
	dst -= f->linesize[0] + linelen;
	}
	}

	#if !HAVE_BIGENDIAN
	#define copy_frame_16(f, s, l, h) copy_frame_default(f, s, l, l, h)
	#define copy_frame_32(f, s, l, h) copy_frame_default(f, s, l, l, h)
	#define add_frame_16(f, s, l, h) add_frame_default(f, s, l, l, h)
	#define add_frame_32(f, s, l, h) add_frame_default(f, s, l, l, h)
	#else
	static void copy_frame_16(AVFrame f, const uint8_t src,
	int linelen, int height) {
	int i, j;
	uint8_t *dst = f->data[0];
	dst += (height - 1) * f->linesize[0];
	for (i = height; i; i--) {
	for (j = linelen / 2; j; j--) {
	dst[0] = src[1];
	dst[1] = src[0];
	src += 2;
	dst += 2;
	}
	dst -= f->linesize[0] + linelen;
	}
	}

	static void copy_frame_32(AVFrame f, const uint8_t src,
	int linelen, int height) {
	int i, j;
	uint8_t *dst = f->data[0];
	dst += (height - 1) * f->linesize[0];
	for (i = height; i; i--) {
	for (j = linelen / 4; j; j--) {
	dst[0] = src[3];
	dst[1] = src[2];
	dst[2] = src[1];
	dst[3] = src[0];
	src += 4;
	dst += 4;
	}
	dst -= f->linesize[0] + linelen;
	}
	}

	static void add_frame_16(AVFrame f, const uint8_t src,
	int linelen, int height) {
	int i, j;
	uint8_t *dst = f->data[0];
	dst += (height - 1) * f->linesize[0];
	for (i = height; i; i--) {
	for (j = linelen / 2; j; j--) {
	dst[0] += src[1];
	dst[1] += src[0];
	src += 2;
	dst += 2;
	}
	dst -= f->linesize[0] + linelen;
	}
	}

	static void add_frame_32(AVFrame f, const uint8_t src,
	int linelen, int height) {
	int i, j;
	uint8_t *dst = f->data[0];
	dst += (height - 1) * f->linesize[0];
	for (i = height; i; i--) {
	for (j = linelen / 4; j; j--) {
	dst[0] += src[3];
	dst[1] += src[2];
	dst[2] += src[1];
	dst[3] += src[0];
	src += 4;
	dst += 4;
	}
	dst -= f->linesize[0] + linelen;
	}
	}
	#endif

	static int decode_frame(AVCodecContext avctx, void data, int *data_size,
	AVPacket *avpkt) {
	const uint8_t *buf = avpkt->data;
	int buf_size = avpkt->size;
	CamStudioContext *c = avctx->priv_data;
	AVFrame *picture = data;

	if (buf_size < 2) {
	av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
	return -1;
	}

	if (c->pic.data[0])
	avctx->release_buffer(avctx, &c->pic);
	c->pic.reference = 3;
	c->pic.buffer_hints = FF_BUFFER_HINTS_VALID \| FF_BUFFER_HINTS_READABLE \|
	FF_BUFFER_HINTS_PRESERVE \| FF_BUFFER_HINTS_REUSABLE;
	if (avctx->get_buffer(avctx, &c->pic) < 0) {
	av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
	return -1;
	}

	// decompress data
	switch ((buf[0] >> 1) & 7) {
	case 0: { // lzo compression
	int outlen = c->decomp_size, inlen = buf_size - 2;
	if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen))
	av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
	break;
	}
	case 1: { // zlib compression
	#if CONFIG_ZLIB
	unsigned long dlen = c->decomp_size;
	if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK)
	av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
	break;
	#else
	av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n");
	return -1;
	#endif
	}
	default:
	av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
	return -1;
	}

	// flip upside down, add difference frame
	if (buf[0] & 1) { // keyframe
	c->pic.pict_type = AV_PICTURE_TYPE_I;
	c->pic.key_frame = 1;
	switch (c->bpp) {
	case 16:
	copy_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height);
	break;
	case 32:
	copy_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
	break;
	default:
	copy_frame_default(&c->pic, c->decomp_buf, FFALIGN(c->linelen, 4),
	c->linelen, c->height);
	}
	} else {
	c->pic.pict_type = AV_PICTURE_TYPE_P;
	c->pic.key_frame = 0;
	switch (c->bpp) {
	case 16:
	add_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height);
	break;
	case 32:
	add_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
	break;
	default:
	add_frame_default(&c->pic, c->decomp_buf, FFALIGN(c->linelen, 4),
	c->linelen, c->height);
	}
	}

	*picture = c->pic;
	*data_size = sizeof(AVFrame);
	return buf_size;
	}

	static av_cold int decode_init(AVCodecContext *avctx) {
	CamStudioContext *c = avctx->priv_data;
	int stride;
	switch (avctx->bits_per_coded_sample) {
	case 16: avctx->pix_fmt = PIX_FMT_RGB555; break;
	case 24: avctx->pix_fmt = PIX_FMT_BGR24; break;
	case 32: avctx->pix_fmt = PIX_FMT_RGB32; break;
	default:
	av_log(avctx, AV_LOG_ERROR,
	"CamStudio codec error: invalid depth %i bpp\n",
	avctx->bits_per_coded_sample);
	return AVERROR_INVALIDDATA;
	}
	c->bpp = avctx->bits_per_coded_sample;
	avcodec_get_frame_defaults(&c->pic);
	c->pic.data[0] = NULL;
	c->linelen = avctx->width * avctx->bits_per_coded_sample / 8;
	c->height = avctx->height;
	stride = c->linelen;
	if (avctx->bits_per_coded_sample == 24)
	stride = FFALIGN(stride, 4);
	c->decomp_size = c->height * stride;
	c->decomp_buf = av_malloc(c->decomp_size + AV_LZO_OUTPUT_PADDING);
	if (!c->decomp_buf) {
	av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
	return AVERROR(ENOMEM);
	}
	return 0;
	}

	static av_cold int decode_end(AVCodecContext *avctx) {
	CamStudioContext *c = avctx->priv_data;
	av_freep(&c->decomp_buf);
	if (c->pic.data[0])
	avctx->release_buffer(avctx, &c->pic);
	return 0;
	}

	AVCodec ff_cscd_decoder = {
	.name = "camstudio",
	.type = AVMEDIA_TYPE_VIDEO,
	.id = CODEC_ID_CSCD,
	.priv_data_size = sizeof(CamStudioContext),
	.init = decode_init,
	.close = decode_end,
	.decode = decode_frame,
	.capabilities = CODEC_CAP_DR1,
	.long_name = NULL_IF_CONFIG_SMALL("CamStudio"),
	};