/* * Micrsoft RLE Video Decoder * Copyright (C) 2003 the ffmpeg project * * 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 libavcodec/msrle.c * MS RLE Video Decoder by Mike Melanson (melanson@pcisys.net) * For more information about the MS RLE format, visit: * http://www.pcisys.net/~melanson/codecs/ * * The MS RLE decoder outputs PAL8 colorspace data. * * Note that this decoder expects the palette colors from the end of the * BITMAPINFO header passed through palctrl. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include "avcodec.h" #include "dsputil.h" #include "msrledec.h" typedef struct MsrleContext { AVCodecContext *avctx; AVFrame frame; const unsigned char *buf; int size; } MsrleContext; static av_cold int msrle_decode_init(AVCodecContext *avctx) { MsrleContext *s = avctx->priv_data; s->avctx = avctx; switch (avctx->bits_per_coded_sample) { case 4: case 8: avctx->pix_fmt = PIX_FMT_PAL8; break; case 24: avctx->pix_fmt = PIX_FMT_BGR24; break; default: av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample\n"); return -1; } s->frame.data[0] = NULL; return 0; } static int msrle_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; MsrleContext *s = avctx->priv_data; int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8; s->buf = buf; s->size = buf_size; s->frame.reference = 1; s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; if (avctx->reget_buffer(avctx, &s->frame)) { av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); return -1; } if (s->avctx->palctrl) { /* 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; } } /* FIXME how to correctly detect RLE ??? */ if (avctx->height * istride == avpkt->size) { /* assume uncompressed */ int linesize = avctx->width * avctx->bits_per_coded_sample / 8; uint8_t *ptr = s->frame.data[0]; uint8_t *buf = avpkt->data + (avctx->height-1)*istride; int i, j; for (i = 0; i < avctx->height; i++) { if (avctx->bits_per_coded_sample == 4) { for (j = 0; j < avctx->width - 1; j += 2) { ptr[j+0] = buf[j>>1] >> 4; ptr[j+1] = buf[j>>1] & 0xF; } if (avctx->width & 1) ptr[j+0] = buf[j>>1] >> 4; } else { memcpy(ptr, buf, linesize); } buf -= istride; ptr += s->frame.linesize[0]; } } else { ff_msrle_decode(avctx, (AVPicture*)&s->frame, avctx->bits_per_coded_sample, buf, buf_size); } *data_size = sizeof(AVFrame); *(AVFrame*)data = s->frame; /* report that the buffer was completely consumed */ return buf_size; } static av_cold int msrle_decode_end(AVCodecContext *avctx) { MsrleContext *s = avctx->priv_data; /* release the last frame */ if (s->frame.data[0]) avctx->release_buffer(avctx, &s->frame); return 0; } AVCodec msrle_decoder = { "msrle", CODEC_TYPE_VIDEO, CODEC_ID_MSRLE, sizeof(MsrleContext), msrle_decode_init, NULL, msrle_decode_end, msrle_decode_frame, CODEC_CAP_DR1, .long_name= NULL_IF_CONFIG_SMALL("Microsoft RLE"), };