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159 lines
4.5 KiB
159 lines
4.5 KiB
/* |
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* Microsoft RLE video decoder |
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* Copyright (C) 2003 the ffmpeg project |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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/** |
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* @file |
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* MS RLE video decoder by Mike Melanson (melanson@pcisys.net) |
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* For more information about the MS RLE format, visit: |
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* http://www.pcisys.net/~melanson/codecs/ |
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* |
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* The MS RLE decoder outputs PAL8 colorspace data. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "avcodec.h" |
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#include "internal.h" |
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#include "msrledec.h" |
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typedef struct MsrleContext { |
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AVCodecContext *avctx; |
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AVFrame frame; |
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GetByteContext gb; |
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const unsigned char *buf; |
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int size; |
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uint32_t pal[256]; |
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} MsrleContext; |
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static av_cold int msrle_decode_init(AVCodecContext *avctx) |
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{ |
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MsrleContext *s = avctx->priv_data; |
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s->avctx = avctx; |
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switch (avctx->bits_per_coded_sample) { |
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case 4: |
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case 8: |
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avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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break; |
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case 24: |
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avctx->pix_fmt = AV_PIX_FMT_BGR24; |
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break; |
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default: |
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av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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avcodec_get_frame_defaults(&s->frame); |
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return 0; |
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} |
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static int msrle_decode_frame(AVCodecContext *avctx, |
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void *data, int *got_frame, |
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AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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MsrleContext *s = avctx->priv_data; |
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int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8; |
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int ret; |
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s->buf = buf; |
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s->size = buf_size; |
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if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); |
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return ret; |
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} |
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if (avctx->bits_per_coded_sample <= 8) { |
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const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL); |
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if (pal) { |
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s->frame.palette_has_changed = 1; |
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memcpy(s->pal, pal, AVPALETTE_SIZE); |
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} |
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/* make the palette available */ |
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memcpy(s->frame.data[1], s->pal, AVPALETTE_SIZE); |
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} |
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/* FIXME how to correctly detect RLE ??? */ |
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if (avctx->height * istride == avpkt->size) { /* assume uncompressed */ |
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int linesize = avctx->width * avctx->bits_per_coded_sample / 8; |
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uint8_t *ptr = s->frame.data[0]; |
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uint8_t *buf = avpkt->data + (avctx->height-1)*istride; |
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int i, j; |
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for (i = 0; i < avctx->height; i++) { |
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if (avctx->bits_per_coded_sample == 4) { |
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for (j = 0; j < avctx->width - 1; j += 2) { |
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ptr[j+0] = buf[j>>1] >> 4; |
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ptr[j+1] = buf[j>>1] & 0xF; |
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} |
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if (avctx->width & 1) |
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ptr[j+0] = buf[j>>1] >> 4; |
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} else { |
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memcpy(ptr, buf, linesize); |
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} |
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buf -= istride; |
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ptr += s->frame.linesize[0]; |
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} |
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} else { |
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bytestream2_init(&s->gb, buf, buf_size); |
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ff_msrle_decode(avctx, (AVPicture*)&s->frame, avctx->bits_per_coded_sample, &s->gb); |
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} |
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if ((ret = av_frame_ref(data, &s->frame)) < 0) |
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return ret; |
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*got_frame = 1; |
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/* report that the buffer was completely consumed */ |
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return buf_size; |
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} |
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static av_cold int msrle_decode_end(AVCodecContext *avctx) |
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{ |
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MsrleContext *s = avctx->priv_data; |
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/* release the last frame */ |
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av_frame_unref(&s->frame); |
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return 0; |
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} |
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AVCodec ff_msrle_decoder = { |
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.name = "msrle", |
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.long_name = NULL_IF_CONFIG_SMALL("Microsoft RLE"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_MSRLE, |
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.priv_data_size = sizeof(MsrleContext), |
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.init = msrle_decode_init, |
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.close = msrle_decode_end, |
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.decode = msrle_decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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};
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