mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Paul B Mahol <onemda@gmail.com>pull/254/merge
Paul B Mahol
8 years ago
parent
fd1443b5dd
commit
a96db6be06
8 changed files with 244 additions and 0 deletions
@ -0,0 +1,231 @@ |
||||
/*
|
||||
* 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; |
||||
} MSCCContext; |
||||
|
||||
static int rle_uncompress(AVCodecContext *avctx, GetByteContext *gb, PutByteContext *pb, int bpp) |
||||
{ |
||||
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; |
||||
} |
||||
} |
||||
} else { |
||||
unsigned copy = bytestream2_get_byte(gb); |
||||
|
||||
if (copy == 1) { |
||||
return 0; |
||||
} else if (copy == 2) { |
||||
unsigned x, y; |
||||
|
||||
x = bytestream2_get_byte(gb); |
||||
y = bytestream2_get_byte(gb); |
||||
|
||||
bytestream2_skip_p(pb, x * bpp); |
||||
bytestream2_skip_p(pb, y * bpp * avctx->width); |
||||
} 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; |
||||
} |
||||
} |
||||
} |
||||
} |
||||
} |
||||
|
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
|
||||
static int decode_frame(AVCodecContext *avctx, |
||||
void *data, int *got_frame, |
||||
AVPacket *avpkt) |
||||
{ |
||||
MSCCContext *s = avctx->priv_data; |
||||
AVFrame *frame = data; |
||||
GetByteContext gb; |
||||
PutByteContext pb; |
||||
int ret, j; |
||||
|
||||
if (avpkt->size < 3) |
||||
return AVERROR_INVALIDDATA; |
||||
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
||||
return ret; |
||||
|
||||
avpkt->data[2] ^= avpkt->data[0]; |
||||
|
||||
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 = avpkt->data + 2; |
||||
s->zstream.avail_in = avpkt->size - 2; |
||||
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, s->bpp); |
||||
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 zret; |
||||
|
||||
switch (avctx->bits_per_coded_sample) { |
||||
case 8: avctx->pix_fmt = AV_PIX_FMT_GRAY8; 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; |
||||
memset(&s->zstream, 0, sizeof(z_stream)); |
||||
|
||||
s->decomp_size = 4 * avctx->height * ((avctx->width * avctx->bits_per_coded_sample + 31) / 32); |
||||
if (!(s->decomp_buf = av_malloc(s->decomp_size))) |
||||
return AVERROR(ENOMEM); |
||||
|
||||
s->uncomp_size = 4 * avctx->height * ((avctx->width * avctx->bits_per_coded_sample + 31) / 32); |
||||
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, |
||||
}; |
||||
Loading…
Reference in new issue