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/* |
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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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}; |