yading@10: /* yading@10: * Microsoft RLE video decoder yading@10: * Copyright (C) 2003 the ffmpeg project yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * MS RLE video decoder by Mike Melanson (melanson@pcisys.net) yading@10: * For more information about the MS RLE format, visit: yading@10: * http://www.pcisys.net/~melanson/codecs/ yading@10: * yading@10: * The MS RLE decoder outputs PAL8 colorspace data. yading@10: */ yading@10: yading@10: #include yading@10: #include yading@10: #include yading@10: yading@10: #include "avcodec.h" yading@10: #include "internal.h" yading@10: #include "msrledec.h" yading@10: yading@10: typedef struct MsrleContext { yading@10: AVCodecContext *avctx; yading@10: AVFrame frame; yading@10: yading@10: GetByteContext gb; yading@10: const unsigned char *buf; yading@10: int size; yading@10: yading@10: uint32_t pal[256]; yading@10: } MsrleContext; yading@10: yading@10: static av_cold int msrle_decode_init(AVCodecContext *avctx) yading@10: { yading@10: MsrleContext *s = avctx->priv_data; yading@10: int i; yading@10: yading@10: s->avctx = avctx; yading@10: yading@10: switch (avctx->bits_per_coded_sample) { yading@10: case 1: yading@10: avctx->pix_fmt = AV_PIX_FMT_MONOWHITE; yading@10: break; yading@10: case 4: yading@10: case 8: yading@10: avctx->pix_fmt = AV_PIX_FMT_PAL8; yading@10: break; yading@10: case 24: yading@10: avctx->pix_fmt = AV_PIX_FMT_BGR24; yading@10: break; yading@10: default: yading@10: av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: avcodec_get_frame_defaults(&s->frame); yading@10: yading@10: if (avctx->extradata_size >= 4) yading@10: for (i = 0; i < FFMIN(avctx->extradata_size, AVPALETTE_SIZE)/4; i++) yading@10: s->pal[i] = 0xFFU<<24 | AV_RL32(avctx->extradata+4*i); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int msrle_decode_frame(AVCodecContext *avctx, yading@10: void *data, int *got_frame, yading@10: AVPacket *avpkt) yading@10: { yading@10: const uint8_t *buf = avpkt->data; yading@10: int buf_size = avpkt->size; yading@10: MsrleContext *s = avctx->priv_data; yading@10: int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8; yading@10: int ret; yading@10: yading@10: s->buf = buf; yading@10: s->size = buf_size; yading@10: yading@10: if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0) yading@10: return ret; yading@10: yading@10: if (avctx->bits_per_coded_sample > 1 && avctx->bits_per_coded_sample <= 8) { yading@10: const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL); yading@10: yading@10: if (pal) { yading@10: s->frame.palette_has_changed = 1; yading@10: memcpy(s->pal, pal, AVPALETTE_SIZE); yading@10: } yading@10: /* make the palette available */ yading@10: memcpy(s->frame.data[1], s->pal, AVPALETTE_SIZE); yading@10: } yading@10: yading@10: /* FIXME how to correctly detect RLE ??? */ yading@10: if (avctx->height * istride == avpkt->size) { /* assume uncompressed */ yading@10: int linesize = (avctx->width * avctx->bits_per_coded_sample + 7) / 8; yading@10: uint8_t *ptr = s->frame.data[0]; yading@10: uint8_t *buf = avpkt->data + (avctx->height-1)*istride; yading@10: int i, j; yading@10: yading@10: for (i = 0; i < avctx->height; i++) { yading@10: if (avctx->bits_per_coded_sample == 4) { yading@10: for (j = 0; j < avctx->width - 1; j += 2) { yading@10: ptr[j+0] = buf[j>>1] >> 4; yading@10: ptr[j+1] = buf[j>>1] & 0xF; yading@10: } yading@10: if (avctx->width & 1) yading@10: ptr[j+0] = buf[j>>1] >> 4; yading@10: } else { yading@10: memcpy(ptr, buf, linesize); yading@10: } yading@10: buf -= istride; yading@10: ptr += s->frame.linesize[0]; yading@10: } yading@10: } else { yading@10: bytestream2_init(&s->gb, buf, buf_size); yading@10: ff_msrle_decode(avctx, (AVPicture*)&s->frame, avctx->bits_per_coded_sample, &s->gb); yading@10: } yading@10: yading@10: if ((ret = av_frame_ref(data, &s->frame)) < 0) yading@10: return ret; yading@10: yading@10: *got_frame = 1; yading@10: yading@10: /* report that the buffer was completely consumed */ yading@10: return buf_size; yading@10: } yading@10: yading@10: static av_cold int msrle_decode_end(AVCodecContext *avctx) yading@10: { yading@10: MsrleContext *s = avctx->priv_data; yading@10: yading@10: /* release the last frame */ yading@10: av_frame_unref(&s->frame); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: AVCodec ff_msrle_decoder = { yading@10: .name = "msrle", yading@10: .type = AVMEDIA_TYPE_VIDEO, yading@10: .id = AV_CODEC_ID_MSRLE, yading@10: .priv_data_size = sizeof(MsrleContext), yading@10: .init = msrle_decode_init, yading@10: .close = msrle_decode_end, yading@10: .decode = msrle_decode_frame, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("Microsoft RLE"), yading@10: };