mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
7 years ago
parent
38ec5b4aa4
commit
f7d749e95b
9 changed files with 206 additions and 1 deletions
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/*
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* MatchWare Screen Capture Codec decoder |
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* |
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* Copyright (c) 2018 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#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 "bytestream.h" |
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#include "internal.h" |
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#include <zlib.h> |
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typedef struct MWSCContext { |
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unsigned int decomp_size; |
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uint8_t *decomp_buf; |
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z_stream zstream; |
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AVFrame *prev_frame; |
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} MWSCContext; |
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static int rle_uncompress(GetByteContext *gb, PutByteContext *pb, GetByteContext *gbp, |
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int width, int height, int stride, int pb_linesize, int gbp_linesize) |
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{ |
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int intra = 1, w = 0; |
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bytestream2_seek_p(pb, (height - 1) * pb_linesize, SEEK_SET); |
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while (bytestream2_get_bytes_left(gb) > 0) { |
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uint32_t fill = bytestream2_get_le24(gb); |
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unsigned run = bytestream2_get_byte(gb); |
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if (run == 0) { |
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run = bytestream2_get_le32(gb); |
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for (int j = 0; j < run; j++, w++) { |
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if (w == width) { |
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w = 0; |
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bytestream2_seek_p(pb, -(pb_linesize + stride), SEEK_CUR); |
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} |
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bytestream2_put_le24(pb, fill); |
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} |
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} else if (run == 255) { |
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int pos = bytestream2_tell_p(pb); |
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bytestream2_seek(gbp, pos, SEEK_SET); |
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for (int j = 0; j < fill; j++, w++) { |
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if (w == width) { |
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w = 0; |
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bytestream2_seek_p(pb, -(pb_linesize + stride), SEEK_CUR); |
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bytestream2_seek(gbp, -(gbp_linesize + stride), SEEK_CUR); |
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} |
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bytestream2_put_le24(pb, bytestream2_get_le24(gbp)); |
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} |
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intra = 0; |
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} else { |
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for (int j = 0; j < run; j++, w++) { |
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if (w == width) { |
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w = 0; |
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bytestream2_seek_p(pb, -(pb_linesize + stride), SEEK_CUR); |
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} |
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bytestream2_put_le24(pb, fill); |
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} |
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} |
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} |
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return intra; |
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} |
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static int 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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MWSCContext *s = avctx->priv_data; |
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AVFrame *frame = data; |
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uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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GetByteContext gb; |
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GetByteContext gbp; |
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PutByteContext pb; |
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int ret; |
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ret = inflateReset(&s->zstream); |
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if (ret != Z_OK) { |
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av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret); |
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return AVERROR_EXTERNAL; |
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} |
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s->zstream.next_in = buf; |
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s->zstream.avail_in = buf_size; |
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s->zstream.next_out = s->decomp_buf; |
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s->zstream.avail_out = s->decomp_size; |
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ret = inflate(&s->zstream, Z_FINISH); |
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if (ret != Z_STREAM_END) { |
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av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret); |
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return AVERROR_EXTERNAL; |
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} |
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if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) |
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return ret; |
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bytestream2_init(&gb, s->decomp_buf, s->zstream.total_out); |
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bytestream2_init(&gbp, s->prev_frame->data[0], avctx->height * s->prev_frame->linesize[0]); |
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bytestream2_init_writer(&pb, frame->data[0], avctx->height * frame->linesize[0]); |
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frame->key_frame = rle_uncompress(&gb, &pb, &gbp, avctx->width, avctx->height, avctx->width * 3, |
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frame->linesize[0], s->prev_frame->linesize[0]); |
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frame->pict_type = frame->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; |
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av_frame_unref(s->prev_frame); |
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if ((ret = av_frame_ref(s->prev_frame, frame)) < 0) |
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return ret; |
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*got_frame = 1; |
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return avpkt->size; |
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} |
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static av_cold int decode_init(AVCodecContext *avctx) |
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{ |
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MWSCContext *s = avctx->priv_data; |
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int64_t size; |
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int zret; |
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avctx->pix_fmt = AV_PIX_FMT_BGR24; |
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size = 32LL * avctx->height * avctx->width; |
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if (size >= INT32_MAX) |
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return AVERROR_INVALIDDATA; |
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s->decomp_size = size; |
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if (!(s->decomp_buf = av_malloc(s->decomp_size))) |
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return AVERROR(ENOMEM); |
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s->zstream.zalloc = Z_NULL; |
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s->zstream.zfree = Z_NULL; |
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s->zstream.opaque = Z_NULL; |
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zret = inflateInit(&s->zstream); |
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if (zret != Z_OK) { |
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av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret); |
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return AVERROR_EXTERNAL; |
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} |
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s->prev_frame = av_frame_alloc(); |
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if (!s->prev_frame) |
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return AVERROR(ENOMEM); |
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return 0; |
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} |
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static av_cold int decode_close(AVCodecContext *avctx) |
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{ |
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MWSCContext *s = avctx->priv_data; |
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av_frame_free(&s->prev_frame); |
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av_freep(&s->decomp_buf); |
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s->decomp_size = 0; |
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inflateEnd(&s->zstream); |
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return 0; |
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} |
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AVCodec ff_mwsc_decoder = { |
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.name = "mwsc", |
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.long_name = NULL_IF_CONFIG_SMALL("MatchWare Screen Capture Codec"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_MWSC, |
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.priv_data_size = sizeof(MWSCContext), |
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.init = decode_init, |
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.close = decode_close, |
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.decode = decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | |
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FF_CODEC_CAP_INIT_CLEANUP, |
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}; |
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