/* * Quicktime Planar RGB (8BPS) Video Decoder * Copyright (C) 2003 Roberto Togni * * This library 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 of the License, or (at your option) any later version. * * This library 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 this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * */ /** * @file 8bps.c * QT 8BPS Video Decoder by Roberto Togni <rtogni at bresciaonline dot it> * For more information about the 8BPS format, visit: * http://www.pcisys.net/~melanson/codecs/ * * Supports: PAL8 (RGB 8bpp, paletted) * : BGR24 (RGB 24bpp) (can also output it as RGBA32) * : RGBA32 (RGB 32bpp, 4th plane is probably alpha and it's ignored) * */ #include <stdio.h> #include <stdlib.h> #include "common.h" #include "avcodec.h" const enum PixelFormat pixfmt_rgb24[] = {PIX_FMT_BGR24, PIX_FMT_RGBA32, -1}; /* * Decoder context */ typedef struct EightBpsContext { AVCodecContext *avctx; AVFrame pic; unsigned char planes; unsigned char planemap[4]; } EightBpsContext; /* * * Decode a frame * */ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) { EightBpsContext * const c = (EightBpsContext *)avctx->priv_data; unsigned char *encoded = (unsigned char *)buf; unsigned char *pixptr, *pixptr_end; unsigned int height = avctx->height; // Real image height unsigned int dlen, p, row; unsigned char *lp, *dp; unsigned char count; unsigned int px_inc; unsigned int planes = c->planes; unsigned char *planemap = c->planemap; if(c->pic.data[0]) avctx->release_buffer(avctx, &c->pic); c->pic.reference = 0; c->pic.buffer_hints = FF_BUFFER_HINTS_VALID; if(avctx->get_buffer(avctx, &c->pic) < 0){ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } /* Set data pointer after line lengths */ dp = encoded + planes * (height << 1); /* Ignore alpha plane, don't know what to do with it */ if (planes == 4) planes--; px_inc = planes + (avctx->pix_fmt == PIX_FMT_RGBA32); for (p = 0; p < planes; p++) { /* Lines length pointer for this plane */ lp = encoded + p * (height << 1); /* Decode a plane */ for(row = 0; row < height; row++) { pixptr = c->pic.data[0] + row * c->pic.linesize[0] + planemap[p]; pixptr_end = pixptr + c->pic.linesize[0]; dlen = be2me_16(*(unsigned short *)(lp+row*2)); /* Decode a row of this plane */ while(dlen > 0) { if(dp + 1 >= buf+buf_size) return -1; if ((count = *dp++) <= 127) { count++; dlen -= count + 1; if (pixptr + count * px_inc > pixptr_end) break; if(dp + count > buf+buf_size) return -1; while(count--) { *pixptr = *dp++; pixptr += px_inc; } } else { count = 257 - count; if (pixptr + count * px_inc > pixptr_end) break; while(count--) { *pixptr = *dp; pixptr += px_inc; } dp++; dlen -= 2; } } } } if (avctx->palctrl) { memcpy (c->pic.data[1], avctx->palctrl->palette, AVPALETTE_SIZE); if (avctx->palctrl->palette_changed) { c->pic.palette_has_changed = 1; avctx->palctrl->palette_changed = 0; } else c->pic.palette_has_changed = 0; } *data_size = sizeof(AVFrame); *(AVFrame*)data = c->pic; /* always report that the buffer was completely consumed */ return buf_size; } /* * * Init 8BPS decoder * */ static int decode_init(AVCodecContext *avctx) { EightBpsContext * const c = (EightBpsContext *)avctx->priv_data; c->avctx = avctx; avctx->has_b_frames = 0; c->pic.data[0] = NULL; if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) { return 1; } switch (avctx->bits_per_sample) { case 8: avctx->pix_fmt = PIX_FMT_PAL8; c->planes = 1; c->planemap[0] = 0; // 1st plane is palette indexes if (avctx->palctrl == NULL) { av_log(avctx, AV_LOG_ERROR, "Error: PAL8 format but no palette from demuxer.\n"); return -1; } break; case 24: avctx->pix_fmt = avctx->get_format(avctx, pixfmt_rgb24); c->planes = 3; c->planemap[0] = 2; // 1st plane is red c->planemap[1] = 1; // 2nd plane is green c->planemap[2] = 0; // 3rd plane is blue break; case 32: avctx->pix_fmt = PIX_FMT_RGBA32; c->planes = 4; #ifdef WORDS_BIGENDIAN c->planemap[0] = 1; // 1st plane is red c->planemap[1] = 2; // 2nd plane is green c->planemap[2] = 3; // 3rd plane is blue c->planemap[3] = 0; // 4th plane is alpha??? #else c->planemap[0] = 2; // 1st plane is red c->planemap[1] = 1; // 2nd plane is green c->planemap[2] = 0; // 3rd plane is blue c->planemap[3] = 3; // 4th plane is alpha??? #endif break; default: av_log(avctx, AV_LOG_ERROR, "Error: Unsupported color depth: %u.\n", avctx->bits_per_sample); return -1; } return 0; } /* * * Uninit 8BPS decoder * */ static int decode_end(AVCodecContext *avctx) { EightBpsContext * const c = (EightBpsContext *)avctx->priv_data; if (c->pic.data[0]) avctx->release_buffer(avctx, &c->pic); return 0; } AVCodec eightbps_decoder = { "8bps", CODEC_TYPE_VIDEO, CODEC_ID_8BPS, sizeof(EightBpsContext), decode_init, NULL, decode_end, decode_frame, CODEC_CAP_DR1, };