[FFmpeg-cvslog] Add FM Screen Capture Codec decoder
Paul B Mahol
git at videolan.org
Sat Oct 28 03:27:13 EEST 2017
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Mon Feb 6 09:17:29 2017 +0100| [95a8a03a191204c3ca5c8cf6b69ab166765d5ff3] | committer: Diego Biurrun
Add FM Screen Capture Codec decoder
Signed-off-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Diego Biurrun <diego at biurrun.de>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=95a8a03a191204c3ca5c8cf6b69ab166765d5ff3
---
Changelog | 1 +
doc/general.texi | 1 +
libavcodec/Makefile | 1 +
libavcodec/allcodecs.c | 1 +
libavcodec/avcodec.h | 1 +
libavcodec/codec_desc.c | 7 +
libavcodec/fmvc.c | 636 ++++++++++++++++++++++++++++++++++++++++++++++++
libavcodec/version.h | 2 +-
libavformat/riff.c | 1 +
9 files changed, 650 insertions(+), 1 deletion(-)
diff --git a/Changelog b/Changelog
index b3aed3cd7e..dccf173741 100644
--- a/Changelog
+++ b/Changelog
@@ -13,6 +13,7 @@ version <next>:
--x86asmexe=yasm to configure to restore the old behavior.
- Cineform HD decoder
- VP9 superframe split/merge bitstream filters
+- FM Screen Capture Codec decoder
version 12:
diff --git a/doc/general.texi b/doc/general.texi
index b21195bde2..b1a42c50f8 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -667,6 +667,7 @@ following image formats are supported:
@item Flash Screen Video v2 @tab @tab X
@item Flash Video (FLV) @tab X @tab X
@tab Sorenson H.263 used in Flash
+ at item FM Screen Capture Codec @tab @tab X
@item Forward Uncompressed @tab @tab X
@item Fraps @tab @tab X
@item Go2Meeting @tab @tab X
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index a82210d89f..e835133842 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -235,6 +235,7 @@ OBJS-$(CONFIG_FLASHSV_DECODER) += flashsv.o
OBJS-$(CONFIG_FLASHSV_ENCODER) += flashsvenc.o
OBJS-$(CONFIG_FLASHSV2_DECODER) += flashsv.o
OBJS-$(CONFIG_FLIC_DECODER) += flicvideo.o
+OBJS-$(CONFIG_FMVC_DECODER) += fmvc.o
OBJS-$(CONFIG_FOURXM_DECODER) += 4xm.o
OBJS-$(CONFIG_FRAPS_DECODER) += fraps.o
OBJS-$(CONFIG_FRWU_DECODER) += frwu.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 36f839c852..20b3b35b90 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -161,6 +161,7 @@ void avcodec_register_all(void)
REGISTER_DECODER(FLASHSV2, flashsv2);
REGISTER_DECODER(FLIC, flic);
REGISTER_ENCDEC (FLV, flv);
+ REGISTER_DECODER(FMVC, fmvc);
REGISTER_DECODER(FOURXM, fourxm);
REGISTER_DECODER(FRAPS, fraps);
REGISTER_DECODER(FRWU, frwu);
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 1c58fe2d68..4cf446faf9 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -408,6 +408,7 @@ enum AVCodecID {
AV_CODEC_ID_AV1,
AV_CODEC_ID_PIXLET,
AV_CODEC_ID_CFHD,
+ AV_CODEC_ID_FMVC,
/* various PCM "codecs" */
AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
index 7103b5890a..ed97420d42 100644
--- a/libavcodec/codec_desc.c
+++ b/libavcodec/codec_desc.c
@@ -1210,6 +1210,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
.long_name = NULL_IF_CONFIG_SMALL("Apple Pixlet"),
.props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
},
+ {
+ .id = AV_CODEC_ID_FMVC,
+ .type = AVMEDIA_TYPE_VIDEO,
+ .name = "fmvc",
+ .long_name = NULL_IF_CONFIG_SMALL("FM Screen Capture Codec"),
+ .props = AV_CODEC_PROP_LOSSLESS,
+ },
/* image codecs */
{
diff --git a/libavcodec/fmvc.c b/libavcodec/fmvc.c
new file mode 100644
index 0000000000..64136e392d
--- /dev/null
+++ b/libavcodec/fmvc.c
@@ -0,0 +1,636 @@
+/*
+ * FM Screen Capture Codec decoder
+ *
+ * Copyright (c) 2017 Paul B Mahol
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; 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"
+
+#define BLOCK_HEIGHT 112u
+#define BLOCK_WIDTH 84u
+
+typedef struct InterBlock {
+ int w, h;
+ int size;
+ int xor;
+} InterBlock;
+
+typedef struct FMVCContext {
+ GetByteContext gb;
+ PutByteContext pb;
+ uint8_t *buffer;
+ size_t buffer_size;
+ uint8_t *pbuffer;
+ size_t pbuffer_size;
+ ptrdiff_t stride;
+ int bpp;
+ int yb, xb;
+ InterBlock *blocks;
+ unsigned nb_blocks;
+} FMVCContext;
+
+static int decode_type2(GetByteContext *gb, PutByteContext *pb)
+{
+ unsigned repeat = 0, first = 1, opcode;
+ int i, len, pos;
+
+ while (bytestream2_get_bytes_left(gb) > 0) {
+ GetByteContext gbc;
+
+ while (bytestream2_get_bytes_left(gb) > 0) {
+ if (first) {
+ first = 0;
+ if (bytestream2_peek_byte(gb) > 17) {
+ len = bytestream2_get_byte(gb) - 17;
+ if (len < 4) {
+ do {
+ bytestream2_put_byte(pb, bytestream2_get_byte(gb));
+ --len;
+ } while (len);
+ opcode = bytestream2_peek_byte(gb);
+ continue;
+ } else {
+ do {
+ bytestream2_put_byte(pb, bytestream2_get_byte(gb));
+ --len;
+ } while (len);
+ opcode = bytestream2_peek_byte(gb);
+ if (opcode < 0x10) {
+ bytestream2_skip(gb, 1);
+ pos = - (opcode >> 2) - 4 * bytestream2_get_byte(gb) - 2049;
+
+ bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
+ bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
+
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ len = opcode & 3;
+ if (!len) {
+ repeat = 1;
+ } else {
+ do {
+ bytestream2_put_byte(pb, bytestream2_get_byte(gb));
+ --len;
+ } while (len);
+ opcode = bytestream2_peek_byte(gb);
+ }
+ continue;
+ }
+ }
+ repeat = 0;
+ }
+ repeat = 1;
+ }
+ if (repeat) {
+ repeat = 0;
+ opcode = bytestream2_peek_byte(gb);
+ if (opcode < 0x10) {
+ bytestream2_skip(gb, 1);
+ if (!opcode) {
+ if (!bytestream2_peek_byte(gb)) {
+ do {
+ bytestream2_skip(gb, 1);
+ opcode += 255;
+ } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
+ }
+ opcode += bytestream2_get_byte(gb) + 15;
+ }
+ bytestream2_put_le32(pb, bytestream2_get_le32(gb));
+ for (i = opcode - 1; i > 0; --i)
+ bytestream2_put_byte(pb, bytestream2_get_byte(gb));
+ opcode = bytestream2_peek_byte(gb);
+ if (opcode < 0x10) {
+ bytestream2_skip(gb, 1);
+ pos = - (opcode >> 2) - 4 * bytestream2_get_byte(gb) - 2049;
+
+ bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
+ bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
+
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ len = opcode & 3;
+ if (!len) {
+ repeat = 1;
+ } else {
+ do {
+ bytestream2_put_byte(pb, bytestream2_get_byte(gb));
+ --len;
+ } while (len);
+ opcode = bytestream2_peek_byte(gb);
+ }
+ continue;
+ }
+ }
+ }
+
+ if (opcode >= 0x40) {
+ bytestream2_skip(gb, 1);
+ pos = - ((opcode >> 2) & 7) - 1 - 8 * bytestream2_get_byte(gb);
+ len = (opcode >> 5) - 1;
+
+ bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
+ bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
+
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ do {
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ --len;
+ } while (len);
+
+ len = opcode & 3;
+
+ if (!len) {
+ repeat = 1;
+ } else {
+ do {
+ bytestream2_put_byte(pb, bytestream2_get_byte(gb));
+ --len;
+ } while (len);
+ opcode = bytestream2_peek_byte(gb);
+ }
+ continue;
+ } else if (opcode < 0x20) {
+ break;
+ }
+ len = opcode & 0x1F;
+ bytestream2_skip(gb, 1);
+ if (!len) {
+ if (!bytestream2_peek_byte(gb)) {
+ do {
+ bytestream2_skip(gb, 1);
+ len += 255;
+ } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
+ }
+ len += bytestream2_get_byte(gb) + 31;
+ }
+ i = bytestream2_get_le16(gb);
+ pos = - (i >> 2) - 1;
+
+ bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
+ bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
+
+ if (len < 6 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ do {
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ --len;
+ } while (len);
+ } else {
+ bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
+ for (len = len - 2; len; --len)
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ }
+ len = i & 3;
+ if (!len) {
+ repeat = 1;
+ } else {
+ do {
+ bytestream2_put_byte(pb, bytestream2_get_byte(gb));
+ --len;
+ } while (len);
+ opcode = bytestream2_peek_byte(gb);
+ }
+ }
+ bytestream2_skip(gb, 1);
+ if (opcode < 0x10) {
+ pos = -(opcode >> 2) - 1 - 4 * bytestream2_get_byte(gb);
+
+ bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
+ bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
+
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ len = opcode & 3;
+ if (!len) {
+ repeat = 1;
+ } else {
+ do {
+ bytestream2_put_byte(pb, bytestream2_get_byte(gb));
+ --len;
+ } while (len);
+ opcode = bytestream2_peek_byte(gb);
+ }
+ continue;
+ }
+ len = opcode & 7;
+ if (!len) {
+ if (!bytestream2_peek_byte(gb)) {
+ do {
+ bytestream2_skip(gb, 1);
+ len += 255;
+ } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
+ }
+ len += bytestream2_get_byte(gb) + 7;
+ }
+ i = bytestream2_get_le16(gb);
+ pos = bytestream2_tell_p(pb) - 2048 * (opcode & 8);
+ pos = pos - (i >> 2);
+ if (pos == bytestream2_tell_p(pb))
+ break;
+
+ pos = pos - 0x4000;
+ bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
+ bytestream2_seek(&gbc, pos, SEEK_SET);
+
+ if (len < 6 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ do {
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ --len;
+ } while (len);
+ } else {
+ bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
+ for (len = len - 2; len; --len)
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ }
+
+ len = i & 3;
+ if (!len) {
+ repeat = 1;
+ } else {
+ do {
+ bytestream2_put_byte(pb, bytestream2_get_byte(gb));
+ --len;
+ } while (len);
+ opcode = bytestream2_peek_byte(gb);
+ }
+ }
+
+ return 0;
+}
+
+static int decode_type1(GetByteContext *gb, PutByteContext *pb)
+{
+ unsigned opcode, len;
+ int high = 0;
+ int i, pos;
+
+ while (bytestream2_get_bytes_left(gb) > 0) {
+ GetByteContext gbc;
+
+ while (bytestream2_get_bytes_left(gb) > 0) {
+ while (bytestream2_get_bytes_left(gb) > 0) {
+ opcode = bytestream2_get_byte(gb);
+ high = opcode >= 0x20;
+ if (high)
+ break;
+ if (opcode)
+ break;
+ opcode = bytestream2_get_byte(gb);
+ if (opcode < 0xF8) {
+ opcode += 32;
+ break;
+ }
+ i = opcode - 0xF8;
+ if (i) {
+ len = 256;
+ do {
+ len *= 2;
+ --i;
+ } while (i);
+ } else {
+ len = 280;
+ }
+ do {
+ bytestream2_put_le32(pb, bytestream2_get_le32(gb));
+ bytestream2_put_le32(pb, bytestream2_get_le32(gb));
+ len -= 8;
+ } while (len && bytestream2_get_bytes_left(gb) > 0);
+ }
+
+ if (!high) {
+ do {
+ bytestream2_put_byte(pb, bytestream2_get_byte(gb));
+ --opcode;
+ } while (opcode && bytestream2_get_bytes_left(gb) > 0);
+
+ while (bytestream2_get_bytes_left(gb) > 0) {
+ GetByteContext gbc;
+
+ opcode = bytestream2_get_byte(gb);
+ if (opcode >= 0x20)
+ break;
+ bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
+
+ pos = -(opcode | 32 * bytestream2_get_byte(gb)) - 1;
+ bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ bytestream2_put_byte(pb, bytestream2_get_byte(gb));
+ }
+ }
+ high = 0;
+ if (opcode < 0x40)
+ break;
+ bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
+ pos = (-((opcode & 0x1F) | 32 * bytestream2_get_byte(gb)) - 1);
+ bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET);
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ len = (opcode >> 5) - 1;
+ do {
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ --len;
+ } while (len && bytestream2_get_bytes_left(&gbc) > 0);
+ }
+ len = opcode & 0x1F;
+ if (!len) {
+ if (!bytestream2_peek_byte(gb)) {
+ do {
+ bytestream2_skip(gb, 1);
+ len += 255;
+ } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0);
+ }
+ len += bytestream2_get_byte(gb) + 31;
+ }
+ pos = -bytestream2_get_byte(gb);
+ bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start);
+ bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos - (bytestream2_get_byte(gb) << 8), SEEK_SET);
+ if (bytestream2_tell_p(pb) == bytestream2_tell(&gbc))
+ break;
+ if (len < 5 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) {
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ } else {
+ bytestream2_put_le32(pb, bytestream2_get_le32(&gbc));
+ len--;
+ }
+ do {
+ bytestream2_put_byte(pb, bytestream2_get_byte(&gbc));
+ len--;
+ } while (len && bytestream2_get_bytes_left(&gbc) > 0);
+ }
+
+ return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame, AVPacket *avpkt)
+{
+ FMVCContext *s = avctx->priv_data;
+ GetByteContext *gb = &s->gb;
+ PutByteContext *pb = &s->pb;
+ AVFrame *frame = data;
+ int ret, y, x;
+
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+ return ret;
+
+ bytestream2_init(gb, avpkt->data, avpkt->size);
+ bytestream2_skip(gb, 2);
+
+ frame->key_frame = !!bytestream2_get_le16(gb);
+ frame->pict_type = frame->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
+
+ if (frame->key_frame) {
+ const uint8_t *src;
+ unsigned type, size;
+ uint8_t *dst;
+
+ type = bytestream2_get_le16(gb);
+ size = bytestream2_get_le16(gb);
+ if (size > bytestream2_get_bytes_left(gb))
+ return AVERROR_INVALIDDATA;
+
+ bytestream2_init_writer(pb, s->buffer, s->buffer_size);
+ if (type == 1) {
+ decode_type1(gb, pb);
+ } else if (type == 2){
+ decode_type2(gb, pb);
+ } else {
+ avpriv_report_missing_feature(avctx, "Compression type %d", type);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ src = s->buffer;
+ dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
+ for (y = 0; y < avctx->height; y++) {
+ memcpy(dst, src, avctx->width * s->bpp);
+ dst -= frame->linesize[0];
+ src += avctx->width * s->bpp;
+ }
+ } else {
+ unsigned block, nb_blocks;
+ int type, k, l;
+ uint8_t *ssrc, *ddst;
+ const uint32_t *src;
+ uint32_t *dst;
+
+ for (block = 0; block < s->nb_blocks; block++)
+ s->blocks[block].xor = 0;
+
+ nb_blocks = bytestream2_get_le16(gb);
+ if (nb_blocks > s->nb_blocks)
+ return AVERROR_INVALIDDATA;
+
+ bytestream2_init_writer(pb, s->pbuffer, s->pbuffer_size);
+
+ type = bytestream2_get_le16(gb);
+ for (block = 0; block < nb_blocks; block++) {
+ unsigned size, offset;
+ int start = 0;
+
+ offset = bytestream2_get_le16(gb);
+ if (offset > s->nb_blocks)
+ return AVERROR_INVALIDDATA;
+
+ size = bytestream2_get_le16(gb);
+ if (size > bytestream2_get_bytes_left(gb))
+ return AVERROR_INVALIDDATA;
+
+ start = bytestream2_tell_p(pb);
+ if (type == 1) {
+ decode_type1(gb, pb);
+ } else if (type == 2){
+ decode_type2(gb, pb);
+ } else {
+ avpriv_report_missing_feature(avctx, "Compression type %d", type);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ if (s->blocks[offset].size * 4 != bytestream2_tell_p(pb) - start)
+ return AVERROR_INVALIDDATA;
+
+ s->blocks[offset].xor = 1;
+ }
+
+ src = (const uint32_t *)s->pbuffer;
+ dst = (uint32_t *)s->buffer;
+
+ for (block = 0, y = 0; y < s->yb; y++) {
+ int block_h = s->blocks[block].h;
+ uint32_t *rect = dst;
+
+ for (x = 0; x < s->xb; x++) {
+ int block_w = s->blocks[block].w;
+ uint32_t *row = dst;
+
+ block_h = s->blocks[block].h;
+ if (s->blocks[block].xor) {
+ for (k = 0; k < block_h; k++) {
+ uint32_t *column = dst;
+ for (l = 0; l < block_w; l++)
+ *dst++ ^= *src++;
+ dst = &column[s->stride];
+ }
+ }
+ dst = &row[block_w];
+ ++block;
+ }
+ dst = &rect[block_h * s->stride];
+ }
+
+ ssrc = s->buffer;
+ ddst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
+ for (y = 0; y < avctx->height; y++) {
+ memcpy(ddst, ssrc, avctx->width * s->bpp);
+ ddst -= frame->linesize[0];
+ ssrc += avctx->width * s->bpp;
+ }
+ }
+
+ *got_frame = 1;
+
+ return avpkt->size;
+}
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+ FMVCContext *s = avctx->priv_data;
+ int i, j, m, block = 0, h = BLOCK_HEIGHT, w = BLOCK_WIDTH;
+
+ switch (avctx->bits_per_coded_sample) {
+ 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->stride = (avctx->width * avctx->bits_per_coded_sample + 31) / 32;
+ s->xb = s->stride / BLOCK_WIDTH;
+ m = s->stride % BLOCK_WIDTH;
+ if (m) {
+ if (m < 37) {
+ w = m + BLOCK_WIDTH;
+ } else {
+ w = m;
+ s->xb++;
+ }
+ }
+
+ s->yb = avctx->height / BLOCK_HEIGHT;
+ m = avctx->height % BLOCK_HEIGHT;
+ if (m) {
+ if (m < 49) {
+ h = m + BLOCK_HEIGHT;
+ } else {
+ h = m;
+ s->yb++;
+ }
+ }
+
+ s->nb_blocks = s->xb * s->yb;
+ if (!s->nb_blocks)
+ return AVERROR_INVALIDDATA;
+ s->blocks = av_mallocz(s->nb_blocks * sizeof(*s->blocks));
+ if (!s->blocks)
+ return AVERROR(ENOMEM);
+
+ for (i = 0; i < s->yb; i++) {
+ for (j = 0; j < s->xb; j++) {
+ if (i != (s->yb - 1) || j != (s->xb - 1)) {
+ if (i == s->yb - 1) {
+ s->blocks[block].w = BLOCK_WIDTH;
+ s->blocks[block].h = h;
+ s->blocks[block].size = BLOCK_WIDTH * h;
+ } else if (j == s->xb - 1) {
+ s->blocks[block].w = w;
+ s->blocks[block].h = BLOCK_HEIGHT;
+ s->blocks[block].size = BLOCK_HEIGHT * w;
+ } else {
+ s->blocks[block].w = BLOCK_WIDTH;
+ s->blocks[block].h = BLOCK_HEIGHT;
+ s->blocks[block].size = BLOCK_WIDTH * BLOCK_HEIGHT;
+ }
+ } else {
+ s->blocks[block].w = w;
+ s->blocks[block].h = h;
+ s->blocks[block].size = w * h;
+ }
+ block++;
+ }
+ }
+
+ s->bpp = avctx->bits_per_coded_sample >> 3;
+ s->buffer_size = avctx->width * avctx->height * 4;
+ s->pbuffer_size = avctx->width * avctx->height * 4;
+ s->buffer = av_malloc(s->buffer_size);
+ s->pbuffer = av_malloc(s->pbuffer_size);
+ if (!s->buffer || !s->pbuffer)
+ return AVERROR(ENOMEM);
+
+ return 0;
+}
+
+static av_cold int decode_close(AVCodecContext *avctx)
+{
+ FMVCContext *s = avctx->priv_data;
+
+ av_freep(&s->buffer);
+ av_freep(&s->pbuffer);
+ av_freep(&s->blocks);
+
+ return 0;
+}
+
+AVCodec ff_fmvc_decoder = {
+ .name = "fmvc",
+ .long_name = NULL_IF_CONFIG_SMALL("FM Screen Capture Codec"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_FMVC,
+ .priv_data_size = sizeof(FMVCContext),
+ .init = decode_init,
+ .close = decode_close,
+ .decode = decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
+ .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
+ FF_CODEC_CAP_INIT_CLEANUP,
+};
diff --git a/libavcodec/version.h b/libavcodec/version.h
index 8943ef3d0f..63c9a1f634 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -28,7 +28,7 @@
#include "libavutil/version.h"
#define LIBAVCODEC_VERSION_MAJOR 58
-#define LIBAVCODEC_VERSION_MINOR 1
+#define LIBAVCODEC_VERSION_MINOR 2
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
diff --git a/libavformat/riff.c b/libavformat/riff.c
index 6de4007202..49b8c762d6 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -369,6 +369,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
{ AV_CODEC_ID_MAGICYUV, MKTAG('M', 'A', 'G', 'Y') },
{ AV_CODEC_ID_AV1, MKTAG('A', 'V', '0', '1') },
{ AV_CODEC_ID_CFHD, MKTAG('C', 'F', 'H', 'D') },
+ { AV_CODEC_ID_FMVC, MKTAG('F', 'M', 'V', 'C') },
{ AV_CODEC_ID_NONE, 0 }
};
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