diff options
Diffstat (limited to 'libavcodec/mscc.c')
-rw-r--r-- | libavcodec/mscc.c | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/libavcodec/mscc.c b/libavcodec/mscc.c new file mode 100644 index 0000000..86e4e88 --- /dev/null +++ b/libavcodec/mscc.c @@ -0,0 +1,278 @@ +/* + * Mandsoft Screen Capture Codec decoder + * + * Copyright (c) 2017 Paul B Mahol + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "avcodec.h" +#include "bytestream.h" +#include "internal.h" + +#include <zlib.h> + +typedef struct MSCCContext { + unsigned bpp; + unsigned int decomp_size; + uint8_t *decomp_buf; + unsigned int uncomp_size; + uint8_t *uncomp_buf; + z_stream zstream; + + uint32_t pal[256]; +} MSCCContext; + +static int rle_uncompress(AVCodecContext *avctx, GetByteContext *gb, PutByteContext *pb) +{ + MSCCContext *s = avctx->priv_data; + unsigned x = 0, y = 0; + + while (bytestream2_get_bytes_left(gb) > 0) { + uint32_t fill; + int j; + unsigned run = bytestream2_get_byte(gb); + + if (run) { + switch (avctx->bits_per_coded_sample) { + case 8: + fill = bytestream2_get_byte(gb); + break; + case 16: + fill = bytestream2_get_le16(gb); + break; + case 24: + fill = bytestream2_get_le24(gb); + break; + case 32: + fill = bytestream2_get_le32(gb); + break; + } + + for (j = 0; j < run; j++) { + switch (avctx->bits_per_coded_sample) { + case 8: + bytestream2_put_byte(pb, fill); + break; + case 16: + bytestream2_put_le16(pb, fill); + break; + case 24: + bytestream2_put_le24(pb, fill); + break; + case 32: + bytestream2_put_le32(pb, fill); + break; + } + } + x += run; + } else { + unsigned copy = bytestream2_get_byte(gb); + + if (copy == 0) { + x = 0; + y++; + bytestream2_seek_p(pb, y * avctx->width * s->bpp, SEEK_SET); + } else if (copy == 1) { + return 0; + } else if (copy == 2) { + + x += bytestream2_get_byte(gb); + y += bytestream2_get_byte(gb); + + bytestream2_seek_p(pb, y * avctx->width * s->bpp + x * s->bpp, SEEK_SET); + } else { + for (j = 0; j < copy; j++) { + switch (avctx->bits_per_coded_sample) { + case 8: + bytestream2_put_byte(pb, bytestream2_get_byte(gb)); + break; + case 16: + bytestream2_put_le16(pb, bytestream2_get_le16(gb)); + break; + case 24: + bytestream2_put_le24(pb, bytestream2_get_le24(gb)); + break; + case 32: + bytestream2_put_le32(pb, bytestream2_get_le32(gb)); + break; + } + } + + if (s->bpp == 1 && (copy & 1)) + bytestream2_skip(gb, 1); + x += copy; + } + } + } + + return AVERROR_INVALIDDATA; +} + +static int decode_frame(AVCodecContext *avctx, + void *data, int *got_frame, + AVPacket *avpkt) +{ + MSCCContext *s = avctx->priv_data; + AVFrame *frame = data; + uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + GetByteContext gb; + PutByteContext pb; + int ret, j; + + if (avpkt->size < 3) + return buf_size; + + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) + return ret; + + if (avctx->codec_id == AV_CODEC_ID_MSCC) { + avpkt->data[2] ^= avpkt->data[0]; + buf += 2; + buf_size -= 2; + } + + if (avctx->pix_fmt == AV_PIX_FMT_PAL8) { + int size; + const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size); + + if (pal && size == AVPALETTE_SIZE) { + frame->palette_has_changed = 1; + for (j = 0; j < 256; j++) + s->pal[j] = 0xFF000000 | AV_RL32(pal + j * 4); + } else if (pal) { + av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size); + } + memcpy(frame->data[1], s->pal, AVPALETTE_SIZE); + } + + ret = inflateReset(&s->zstream); + if (ret != Z_OK) { + av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret); + return AVERROR_UNKNOWN; + } + s->zstream.next_in = buf; + s->zstream.avail_in = buf_size; + s->zstream.next_out = s->decomp_buf; + s->zstream.avail_out = s->decomp_size; + ret = inflate(&s->zstream, Z_FINISH); + if (ret != Z_STREAM_END) { + av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret); + return AVERROR_UNKNOWN; + } + + bytestream2_init(&gb, s->decomp_buf, s->zstream.total_out); + bytestream2_init_writer(&pb, s->uncomp_buf, s->uncomp_size); + + ret = rle_uncompress(avctx, &gb, &pb); + if (ret) + return ret; + + for (j = 0; j < avctx->height; j++) { + memcpy(frame->data[0] + (avctx->height - j - 1) * frame->linesize[0], + s->uncomp_buf + s->bpp * j * avctx->width, s->bpp * avctx->width); + } + + frame->key_frame = 1; + frame->pict_type = AV_PICTURE_TYPE_I; + + *got_frame = 1; + + return avpkt->size; +} + +static av_cold int decode_init(AVCodecContext *avctx) +{ + MSCCContext *s = avctx->priv_data; + int stride, zret; + + switch (avctx->bits_per_coded_sample) { + case 8: avctx->pix_fmt = AV_PIX_FMT_PAL8; break; + case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break; + case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break; + case 32: avctx->pix_fmt = AV_PIX_FMT_BGRA; break; + default: + av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", avctx->bits_per_coded_sample); + return AVERROR_INVALIDDATA; + } + + s->bpp = avctx->bits_per_coded_sample >> 3; + stride = 4 * ((avctx->width * avctx->bits_per_coded_sample + 31) / 32); + + s->decomp_size = 2 * avctx->height * stride; + if (!(s->decomp_buf = av_malloc(s->decomp_size))) + return AVERROR(ENOMEM); + + s->uncomp_size = avctx->height * stride; + if (!(s->uncomp_buf = av_malloc(s->uncomp_size))) + return AVERROR(ENOMEM); + + s->zstream.zalloc = Z_NULL; + s->zstream.zfree = Z_NULL; + s->zstream.opaque = Z_NULL; + zret = inflateInit(&s->zstream); + if (zret != Z_OK) { + av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret); + return AVERROR_UNKNOWN; + } + + return 0; +} + +static av_cold int decode_close(AVCodecContext *avctx) +{ + MSCCContext *s = avctx->priv_data; + + av_freep(&s->decomp_buf); + s->decomp_size = 0; + av_freep(&s->uncomp_buf); + s->uncomp_size = 0; + inflateEnd(&s->zstream); + + return 0; +} + +AVCodec ff_mscc_decoder = { + .name = "mscc", + .long_name = NULL_IF_CONFIG_SMALL("Mandsoft Screen Capture Codec"), + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_MSCC, + .priv_data_size = sizeof(MSCCContext), + .init = decode_init, + .close = decode_close, + .decode = decode_frame, + .capabilities = AV_CODEC_CAP_DR1, + .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, +}; + +AVCodec ff_srgc_decoder = { + .name = "srgc", + .long_name = NULL_IF_CONFIG_SMALL("Screen Recorder Gold Codec"), + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_SRGC, + .priv_data_size = sizeof(MSCCContext), + .init = decode_init, + .close = decode_close, + .decode = decode_frame, + .capabilities = AV_CODEC_CAP_DR1, + .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, +}; |