278 lines
8.4 KiB
C
Executable file
278 lines
8.4 KiB
C
Executable file
/*
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* Mandsoft Screen Capture Codec decoder
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*
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* Copyright (c) 2017 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 MSCCContext {
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unsigned bpp;
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unsigned int decomp_size;
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uint8_t *decomp_buf;
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unsigned int uncomp_size;
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uint8_t *uncomp_buf;
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z_stream zstream;
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uint32_t pal[256];
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} MSCCContext;
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static int rle_uncompress(AVCodecContext *avctx, GetByteContext *gb, PutByteContext *pb)
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{
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MSCCContext *s = avctx->priv_data;
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unsigned x = 0, y = 0;
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while (bytestream2_get_bytes_left(gb) > 0) {
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uint32_t fill;
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int j;
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unsigned run = bytestream2_get_byte(gb);
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if (run) {
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switch (avctx->bits_per_coded_sample) {
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case 8:
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fill = bytestream2_get_byte(gb);
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break;
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case 16:
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fill = bytestream2_get_le16(gb);
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break;
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case 24:
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fill = bytestream2_get_le24(gb);
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break;
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case 32:
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fill = bytestream2_get_le32(gb);
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break;
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}
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for (j = 0; j < run; j++) {
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switch (avctx->bits_per_coded_sample) {
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case 8:
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bytestream2_put_byte(pb, fill);
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break;
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case 16:
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bytestream2_put_le16(pb, fill);
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break;
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case 24:
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bytestream2_put_le24(pb, fill);
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break;
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case 32:
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bytestream2_put_le32(pb, fill);
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break;
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}
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}
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x += run;
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} else {
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unsigned copy = bytestream2_get_byte(gb);
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if (copy == 0) {
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x = 0;
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y++;
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bytestream2_seek_p(pb, y * avctx->width * s->bpp, SEEK_SET);
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} else if (copy == 1) {
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return 0;
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} else if (copy == 2) {
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x += bytestream2_get_byte(gb);
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y += bytestream2_get_byte(gb);
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bytestream2_seek_p(pb, y * avctx->width * s->bpp + x * s->bpp, SEEK_SET);
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} else {
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for (j = 0; j < copy; j++) {
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switch (avctx->bits_per_coded_sample) {
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case 8:
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bytestream2_put_byte(pb, bytestream2_get_byte(gb));
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break;
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case 16:
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bytestream2_put_le16(pb, bytestream2_get_le16(gb));
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break;
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case 24:
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bytestream2_put_le24(pb, bytestream2_get_le24(gb));
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break;
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case 32:
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bytestream2_put_le32(pb, bytestream2_get_le32(gb));
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break;
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}
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}
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if (s->bpp == 1 && (copy & 1))
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bytestream2_skip(gb, 1);
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x += copy;
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}
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}
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}
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return AVERROR_INVALIDDATA;
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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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MSCCContext *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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PutByteContext pb;
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int ret, j;
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if (avpkt->size < 3)
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return buf_size;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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if (avctx->codec_id == AV_CODEC_ID_MSCC) {
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avpkt->data[2] ^= avpkt->data[0];
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buf += 2;
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buf_size -= 2;
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}
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if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
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int size;
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const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);
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if (pal && size == AVPALETTE_SIZE) {
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frame->palette_has_changed = 1;
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for (j = 0; j < 256; j++)
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s->pal[j] = 0xFF000000 | AV_RL32(pal + j * 4);
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} else if (pal) {
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av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
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}
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memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);
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}
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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_UNKNOWN;
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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_UNKNOWN;
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}
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bytestream2_init(&gb, s->decomp_buf, s->zstream.total_out);
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bytestream2_init_writer(&pb, s->uncomp_buf, s->uncomp_size);
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ret = rle_uncompress(avctx, &gb, &pb);
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if (ret)
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return ret;
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for (j = 0; j < avctx->height; j++) {
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memcpy(frame->data[0] + (avctx->height - j - 1) * frame->linesize[0],
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s->uncomp_buf + s->bpp * j * avctx->width, s->bpp * avctx->width);
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}
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frame->key_frame = 1;
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frame->pict_type = AV_PICTURE_TYPE_I;
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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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MSCCContext *s = avctx->priv_data;
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int stride, zret;
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switch (avctx->bits_per_coded_sample) {
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case 8: avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
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case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
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case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
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case 32: avctx->pix_fmt = AV_PIX_FMT_BGRA; break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", avctx->bits_per_coded_sample);
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return AVERROR_INVALIDDATA;
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}
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s->bpp = avctx->bits_per_coded_sample >> 3;
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stride = 4 * ((avctx->width * avctx->bits_per_coded_sample + 31) / 32);
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s->decomp_size = 2 * avctx->height * stride;
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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->uncomp_size = avctx->height * stride;
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if (!(s->uncomp_buf = av_malloc(s->uncomp_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_UNKNOWN;
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}
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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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MSCCContext *s = avctx->priv_data;
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av_freep(&s->decomp_buf);
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s->decomp_size = 0;
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av_freep(&s->uncomp_buf);
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s->uncomp_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_mscc_decoder = {
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.name = "mscc",
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.long_name = NULL_IF_CONFIG_SMALL("Mandsoft Screen Capture Codec"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_MSCC,
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.priv_data_size = sizeof(MSCCContext),
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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_CLEANUP,
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};
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AVCodec ff_srgc_decoder = {
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.name = "srgc",
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.long_name = NULL_IF_CONFIG_SMALL("Screen Recorder Gold Codec"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_SRGC,
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.priv_data_size = sizeof(MSCCContext),
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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_CLEANUP,
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};
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