[FFmpeg-cvslog] Go2Webinar decoder
Kostya Shishkov
git at videolan.org
Mon Jun 3 12:54:34 CEST 2013
ffmpeg | branch: master | Kostya Shishkov <kostya.shishkov at gmail.com> | Mon Feb 25 21:38:25 2013 +0100| [2d66a58ccde05e764594bd7e5f0f9244634d0b2c] | committer: Kostya Shishkov
Go2Webinar decoder
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2d66a58ccde05e764594bd7e5f0f9244634d0b2c
---
Changelog | 1 +
configure | 1 +
doc/general.texi | 2 +
libavcodec/Makefile | 1 +
libavcodec/allcodecs.c | 1 +
libavcodec/avcodec.h | 1 +
libavcodec/codec_desc.c | 7 +
libavcodec/g2meet.c | 825 +++++++++++++++++++++++++++++++++++++++++++++++
libavcodec/version.h | 4 +-
libavformat/riff.c | 3 +
10 files changed, 844 insertions(+), 2 deletions(-)
diff --git a/Changelog b/Changelog
index 5466ce1..db2be8d 100644
--- a/Changelog
+++ b/Changelog
@@ -23,6 +23,7 @@ version 10:
- support for slice multithreading in libavfilter
- VC-1 interlaced B-frame support
- support for WavPack muxing (raw and in Matroska)
+- Go2Webinar decoder
version 9:
diff --git a/configure b/configure
index 73f4cd8..be96eb1 100755
--- a/configure
+++ b/configure
@@ -1575,6 +1575,7 @@ flv_decoder_select="h263_decoder"
flv_encoder_select="h263_encoder"
fourxm_decoder_select="dsputil"
fraps_decoder_select="dsputil huffman"
+g2m_decoder_select="dsputil zlib"
h261_decoder_select="error_resilience mpegvideo"
h261_encoder_select="aandcttables mpegvideoenc"
h263_decoder_select="error_resilience h263_parser mpegvideo"
diff --git a/doc/general.texi b/doc/general.texi
index 59ac7ee..16fc5e1 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -507,6 +507,8 @@ following image formats are supported:
@tab Sorenson H.263 used in Flash
@item Forward Uncompressed @tab @tab X
@item Fraps @tab @tab X
+ at item Go2Webinar @tab @tab X
+ @tab fourcc: G2M4
@item H.261 @tab X @tab X
@item H.263 / H.263-1996 @tab X @tab X
@item H.263+ / H.263-1998 / H.263 version 2 @tab X @tab X
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index acc2a93..0381b79 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -177,6 +177,7 @@ OBJS-$(CONFIG_FLIC_DECODER) += flicvideo.o
OBJS-$(CONFIG_FOURXM_DECODER) += 4xm.o
OBJS-$(CONFIG_FRAPS_DECODER) += fraps.o
OBJS-$(CONFIG_FRWU_DECODER) += frwu.o
+OBJS-$(CONFIG_G2M_DECODER) += g2meet.o mjpeg.o
OBJS-$(CONFIG_G723_1_DECODER) += g723_1.o acelp_vectors.o \
celp_filters.o
OBJS-$(CONFIG_GIF_DECODER) += gifdec.o lzw.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index ed8f099..ceadcf5 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -146,6 +146,7 @@ void avcodec_register_all(void)
REGISTER_DECODER(FOURXM, fourxm);
REGISTER_DECODER(FRAPS, fraps);
REGISTER_DECODER(FRWU, frwu);
+ REGISTER_DECODER(G2M, g2m);
REGISTER_ENCDEC (GIF, gif);
REGISTER_ENCDEC (H261, h261);
REGISTER_ENCDEC (H263, h263);
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 21e0491..bb33d4a 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -270,6 +270,7 @@ enum AVCodecID {
AV_CODEC_ID_VP9,
AV_CODEC_ID_AIC,
AV_CODEC_ID_ESCAPE130,
+ AV_CODEC_ID_G2M,
/* 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 b385257..b0da005 100644
--- a/libavcodec/codec_desc.c
+++ b/libavcodec/codec_desc.c
@@ -1221,6 +1221,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
.long_name = NULL_IF_CONFIG_SMALL("Escape 130"),
.props = AV_CODEC_PROP_LOSSY,
},
+ {
+ .id = AV_CODEC_ID_G2M,
+ .type = AVMEDIA_TYPE_VIDEO,
+ .name = "g2m",
+ .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
+ .props = AV_CODEC_PROP_LOSSY,
+ },
/* various PCM "codecs" */
{
diff --git a/libavcodec/g2meet.c b/libavcodec/g2meet.c
new file mode 100644
index 0000000..72c062c
--- /dev/null
+++ b/libavcodec/g2meet.c
@@ -0,0 +1,825 @@
+/*
+ * Go2Webinar decoder
+ * Copyright (c) 2012 Konstantin Shishkov
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * Go2Webinar decoder
+ */
+
+#include <zlib.h>
+
+#include "libavutil/intreadwrite.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "dsputil.h"
+#include "get_bits.h"
+#include "internal.h"
+#include "mjpeg.h"
+
+enum ChunkType {
+ FRAME_INFO = 0xC8,
+ TILE_DATA,
+ CURSOR_POS,
+ CURSOR_SHAPE,
+ CHUNK_CC,
+ CHUNK_CD
+};
+
+enum Compression {
+ COMPR_EPIC_J_B = 2,
+ COMPR_KEMPF_J_B,
+};
+
+static const uint8_t luma_quant[64] = {
+ 8, 6, 5, 8, 12, 20, 26, 31,
+ 6, 6, 7, 10, 13, 29, 30, 28,
+ 7, 7, 8, 12, 20, 29, 35, 28,
+ 7, 9, 11, 15, 26, 44, 40, 31,
+ 9, 11, 19, 28, 34, 55, 52, 39,
+ 12, 18, 28, 32, 41, 52, 57, 46,
+ 25, 32, 39, 44, 52, 61, 60, 51,
+ 36, 46, 48, 49, 56, 50, 52, 50
+};
+
+static const uint8_t chroma_quant[64] = {
+ 9, 9, 12, 24, 50, 50, 50, 50,
+ 9, 11, 13, 33, 50, 50, 50, 50,
+ 12, 13, 28, 50, 50, 50, 50, 50,
+ 24, 33, 50, 50, 50, 50, 50, 50,
+ 50, 50, 50, 50, 50, 50, 50, 50,
+ 50, 50, 50, 50, 50, 50, 50, 50,
+ 50, 50, 50, 50, 50, 50, 50, 50,
+ 50, 50, 50, 50, 50, 50, 50, 50,
+};
+
+typedef struct JPGContext {
+ DSPContext dsp;
+ ScanTable scantable;
+
+ VLC dc_vlc[2], ac_vlc[2];
+ int prev_dc[3];
+ DECLARE_ALIGNED(16, int16_t, block)[6][64];
+
+ uint8_t *buf;
+} JPGContext;
+
+typedef struct G2MContext {
+ JPGContext jc;
+ int version;
+
+ int compression;
+ int width, height, bpp;
+ int tile_width, tile_height;
+ int tiles_x, tiles_y, tile_x, tile_y;
+
+ int got_header;
+
+ uint8_t *framebuf;
+ int framebuf_stride, old_width, old_height;
+
+ uint8_t *synth_tile, *jpeg_tile;
+ int tile_stride, old_tile_w, old_tile_h;
+
+ uint8_t *kempf_buf, *kempf_flags;
+
+ uint8_t *cursor;
+ int cursor_stride;
+ int cursor_fmt;
+ int cursor_w, cursor_h, cursor_x, cursor_y;
+ int cursor_hot_x, cursor_hot_y;
+} G2MContext;
+
+static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table,
+ const uint8_t *val_table, int nb_codes,
+ int is_ac)
+{
+ uint8_t huff_size[256] = { 0 };
+ uint16_t huff_code[256];
+ uint16_t huff_sym[256];
+ int i;
+
+ ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
+
+ for (i = 0; i < 256; i++)
+ huff_sym[i] = i + 16 * is_ac;
+
+ if (is_ac)
+ huff_sym[0] = 16 * 256;
+
+ return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
+ huff_code, 2, 2, huff_sym, 2, 2, 0);
+}
+
+static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
+{
+ int ret;
+
+ ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance,
+ avpriv_mjpeg_val_dc, 12, 0);
+ if (ret)
+ return ret;
+ ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance,
+ avpriv_mjpeg_val_dc, 12, 0);
+ if (ret)
+ return ret;
+ ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance,
+ avpriv_mjpeg_val_ac_luminance, 251, 1);
+ if (ret)
+ return ret;
+ ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance,
+ avpriv_mjpeg_val_ac_chrominance, 251, 1);
+ if (ret)
+ return ret;
+
+ ff_dsputil_init(&c->dsp, avctx);
+ ff_init_scantable(c->dsp.idct_permutation, &c->scantable,
+ ff_zigzag_direct);
+
+ return 0;
+}
+
+static av_cold void jpg_free_context(JPGContext *ctx)
+{
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ ff_free_vlc(&ctx->dc_vlc[i]);
+ ff_free_vlc(&ctx->ac_vlc[i]);
+ }
+
+ av_freep(&ctx->buf);
+}
+
+static void jpg_unescape(const uint8_t *src, int src_size,
+ uint8_t *dst, int *dst_size)
+{
+ const uint8_t *src_end = src + src_size;
+ uint8_t *dst_start = dst;
+
+ while (src < src_end) {
+ uint8_t x = *src++;
+
+ *dst++ = x;
+
+ if (x == 0xFF && !*src)
+ src++;
+ }
+ *dst_size = dst - dst_start;
+}
+
+static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
+ int plane, int16_t *block)
+{
+ int dc, val, pos;
+ const int is_chroma = !!plane;
+ const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
+
+ c->dsp.clear_block(block);
+ dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3);
+ if (dc < 0)
+ return AVERROR_INVALIDDATA;
+ if (dc)
+ dc = get_xbits(gb, dc);
+ dc = dc * qmat[0] + c->prev_dc[plane];
+ block[0] = dc;
+ c->prev_dc[plane] = dc;
+
+ pos = 0;
+ while (pos < 63) {
+ val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 3);
+ if (val < 0)
+ return AVERROR_INVALIDDATA;
+ pos += val >> 4;
+ val &= 0xF;
+ if (pos > 63)
+ return val ? AVERROR_INVALIDDATA : 0;
+ if (val) {
+ int nbits = val;
+
+ val = get_xbits(gb, nbits);
+ val *= qmat[ff_zigzag_direct[pos]];
+ block[c->scantable.permutated[pos]] = val;
+ }
+ }
+ return 0;
+}
+
+static inline void yuv2rgb(uint8_t *out, int Y, int U, int V)
+{
+ out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16));
+ out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
+ out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
+}
+
+static int jpg_decode_data(JPGContext *c, int width, int height,
+ const uint8_t *src, int src_size,
+ uint8_t *dst, int dst_stride,
+ const uint8_t *mask, int mask_stride, int num_mbs,
+ int swapuv)
+{
+ GetBitContext gb;
+ uint8_t *tmp;
+ int mb_w, mb_h, mb_x, mb_y, i, j;
+ int bx, by;
+ int unesc_size;
+ int ret;
+
+ tmp = av_realloc(c->buf, src_size + FF_INPUT_BUFFER_PADDING_SIZE);
+ if (!tmp)
+ return AVERROR(ENOMEM);
+ c->buf = tmp;
+ jpg_unescape(src, src_size, c->buf, &unesc_size);
+ memset(c->buf + unesc_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+ init_get_bits(&gb, c->buf, unesc_size * 8);
+
+ width = FFALIGN(width, 16);
+ mb_w = width >> 4;
+ mb_h = (height + 15) >> 4;
+
+ if (!num_mbs)
+ num_mbs = mb_w * mb_h;
+
+ for (i = 0; i < 3; i++)
+ c->prev_dc[i] = 1024;
+ bx = by = 0;
+ for (mb_y = 0; mb_y < mb_h; mb_y++) {
+ for (mb_x = 0; mb_x < mb_w; mb_x++) {
+ if (mask && !mask[mb_x]) {
+ bx += 16;
+ continue;
+ }
+ for (j = 0; j < 2; j++) {
+ for (i = 0; i < 2; i++) {
+ if ((ret = jpg_decode_block(c, &gb, 0,
+ c->block[i + j * 2])) != 0)
+ return ret;
+ c->dsp.idct(c->block[i + j * 2]);
+ }
+ }
+ for (i = 1; i < 3; i++) {
+ if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
+ return ret;
+ c->dsp.idct(c->block[i + 3]);
+ }
+
+ for (j = 0; j < 16; j++) {
+ uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
+ for (i = 0; i < 16; i++) {
+ int Y, U, V;
+
+ Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
+ U = c->block[4 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
+ V = c->block[5 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
+ yuv2rgb(out + i * 3, Y, U, V);
+ }
+ }
+
+ if (!--num_mbs)
+ return 0;
+ bx += 16;
+ }
+ bx = 0;
+ by += 16;
+ if (mask)
+ mask += mask_stride;
+ }
+
+ return 0;
+}
+
+static void kempf_restore_buf(const uint8_t *src, int len,
+ uint8_t *dst, int stride,
+ const uint8_t *jpeg_tile, int tile_stride,
+ int width, int height,
+ const uint8_t *pal, int npal, int tidx)
+{
+ GetBitContext gb;
+ int i, j, nb, col;
+
+ init_get_bits(&gb, src, len * 8);
+
+ if (npal <= 2) nb = 1;
+ else if (npal <= 4) nb = 2;
+ else if (npal <= 16) nb = 4;
+ else nb = 8;
+
+ for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) {
+ if (get_bits(&gb, 8))
+ continue;
+ for (i = 0; i < width; i++) {
+ col = get_bits(&gb, nb);
+ if (col != tidx)
+ memcpy(dst + i * 3, pal + col * 3, 3);
+ else
+ memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
+ }
+ }
+}
+
+static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
+ const uint8_t *src, int src_size)
+{
+ int width, height;
+ int hdr, zsize, npal, tidx = -1, ret;
+ int i, j;
+ const uint8_t *src_end = src + src_size;
+ uint8_t pal[768], transp[3];
+ uLongf dlen = (c->tile_width + 1) * c->tile_height;
+ int sub_type;
+ int nblocks, cblocks, bstride;
+ int bits, bitbuf, coded;
+ uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
+ tile_y * c->tile_height * c->framebuf_stride;
+
+ if (src_size < 2)
+ return AVERROR_INVALIDDATA;
+
+ width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
+ height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
+
+ hdr = *src++;
+ sub_type = hdr >> 5;
+ if (sub_type == 0) {
+ int j;
+ memcpy(transp, src, 3);
+ src += 3;
+ for (j = 0; j < height; j++, dst += c->framebuf_stride)
+ for (i = 0; i < width; i++)
+ memcpy(dst + i * 3, transp, 3);
+ return 0;
+ } else if (sub_type == 1) {
+ return jpg_decode_data(&c->jc, width, height, src, src_end - src,
+ dst, c->framebuf_stride, NULL, 0, 0, 0);
+ }
+
+ if (sub_type != 2) {
+ memcpy(transp, src, 3);
+ src += 3;
+ }
+ npal = *src++ + 1;
+ memcpy(pal, src, npal * 3); src += npal * 3;
+ if (sub_type != 2) {
+ for (i = 0; i < npal; i++) {
+ if (!memcmp(pal + i * 3, transp, 3)) {
+ tidx = i;
+ break;
+ }
+ }
+ }
+
+ if (src_end - src < 2)
+ return 0;
+ zsize = (src[0] << 8) | src[1]; src += 2;
+
+ if (src_end - src < zsize)
+ return AVERROR_INVALIDDATA;
+
+ ret = uncompress(c->kempf_buf, &dlen, src, zsize);
+ if (ret)
+ return AVERROR_INVALIDDATA;
+ src += zsize;
+
+ if (sub_type == 2) {
+ kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
+ NULL, 0, width, height, pal, npal, tidx);
+ return 0;
+ }
+
+ nblocks = *src++ + 1;
+ cblocks = 0;
+ bstride = FFALIGN(width, 16) >> 4;
+ // blocks are coded LSB and we need normal bitreader for JPEG data
+ bits = 0;
+ for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
+ for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
+ if (!bits) {
+ bitbuf = *src++;
+ bits = 8;
+ }
+ coded = bitbuf & 1;
+ bits--;
+ bitbuf >>= 1;
+ cblocks += coded;
+ if (cblocks > nblocks)
+ return AVERROR_INVALIDDATA;
+ c->kempf_flags[j + i * bstride] = coded;
+ }
+ }
+
+ memset(c->jpeg_tile, 0, c->tile_stride * height);
+ jpg_decode_data(&c->jc, width, height, src, src_end - src,
+ c->jpeg_tile, c->tile_stride,
+ c->kempf_flags, bstride, nblocks, 0);
+
+ kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
+ c->jpeg_tile, c->tile_stride,
+ width, height, pal, npal, tidx);
+
+ return 0;
+}
+
+static int g2m_init_buffers(G2MContext *c)
+{
+ int aligned_height;
+
+ if (!c->framebuf || c->old_width < c->width || c->height < c->height) {
+ c->framebuf_stride = FFALIGN(c->width * 3, 16);
+ aligned_height = FFALIGN(c->height, 16);
+ av_free(c->framebuf);
+ c->framebuf = av_mallocz(c->framebuf_stride * aligned_height);
+ if (!c->framebuf)
+ return AVERROR(ENOMEM);
+ }
+ if (!c->synth_tile || !c->jpeg_tile ||
+ c->old_tile_w < c->tile_width ||
+ c->old_tile_h < c->tile_height) {
+ c->tile_stride = FFALIGN(c->tile_width * 3, 16);
+ aligned_height = FFALIGN(c->tile_height, 16);
+ av_free(c->synth_tile);
+ av_free(c->jpeg_tile);
+ c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
+ c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
+ c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height
+ + FF_INPUT_BUFFER_PADDING_SIZE);
+ c->kempf_flags = av_mallocz( c->tile_width * aligned_height);
+ if (!c->synth_tile || !c->jpeg_tile ||
+ !c->kempf_buf || !c->kempf_flags)
+ return AVERROR(ENOMEM);
+ }
+
+ return 0;
+}
+
+static int g2m_load_cursor(G2MContext *c, GetByteContext *gb)
+{
+ int i, j, k;
+ uint8_t *dst;
+ uint32_t bits;
+
+ c->cursor_stride = c->cursor_w * 4;
+ c->cursor = av_realloc(c->cursor, c->cursor_stride * c->cursor_h);
+ if (!c->cursor)
+ return AVERROR(ENOMEM);
+
+ dst = c->cursor;
+ switch (c->cursor_fmt) {
+ case 1: // old monochrome
+ for (j = 0; j < c->cursor_h; j++) {
+ for (i = 0; i < c->cursor_w; i += 32) {
+ bits = bytestream2_get_be32(gb);
+ for (k = 0; k < 32; k++) {
+ dst[0] = !!(bits & 0x80000000);
+ dst += 4;
+ bits <<= 1;
+ }
+ }
+ }
+
+ dst = c->cursor;
+ for (j = 0; j < c->cursor_h; j++) {
+ for (i = 0; i < c->cursor_w; i += 32) {
+ bits = bytestream2_get_be32(gb);
+ for (k = 0; k < 32; k++) {
+ int mask_bit = !!(bits & 0x80000000);
+ switch (dst[0] * 2 + mask_bit) {
+ case 0:
+ dst[0] = 0xFF; dst[1] = 0x00;
+ dst[2] = 0x00; dst[3] = 0x00;
+ break;
+ case 1:
+ dst[0] = 0xFF; dst[1] = 0xFF;
+ dst[2] = 0xFF; dst[3] = 0xFF;
+ break;
+ default:
+ dst[0] = 0x00; dst[1] = 0x00;
+ dst[2] = 0x00; dst[3] = 0x00;
+ }
+ dst += 4;
+ bits <<= 1;
+ }
+ }
+ }
+ break;
+ case 32: // full colour
+ /* skip monochrome version of the cursor and decode RGBA instead */
+ bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
+ for (j = 0; j < c->cursor_h; j++) {
+ for (i = 0; i < c->cursor_w; i++) {
+ int val = bytestream2_get_be32(gb);
+ *dst++ = val >> 0;
+ *dst++ = val >> 8;
+ *dst++ = val >> 16;
+ *dst++ = val >> 24;
+ }
+ }
+ break;
+ default:
+ return AVERROR_PATCHWELCOME;
+ }
+ return 0;
+}
+
+#define APPLY_ALPHA(src, new, alpha) \
+ src = (src * (256 - alpha) + new * alpha) >> 8
+
+static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
+{
+ int i, j;
+ int x, y, w, h;
+ const uint8_t *cursor;
+
+ if (!c->cursor)
+ return;
+
+ x = c->cursor_x - c->cursor_hot_x;
+ y = c->cursor_y - c->cursor_hot_y;
+
+ cursor = c->cursor;
+ w = c->cursor_w;
+ h = c->cursor_h;
+
+ if (x + w > c->width)
+ w = c->width - x;
+ if (y + h > c->height)
+ h = c->height - y;
+ if (x < 0) {
+ w += x;
+ cursor += -x * 4;
+ } else {
+ dst += x * 3;
+ }
+ if (y < 0) {
+ h += y;
+ cursor += -y * c->cursor_stride;
+ } else {
+ dst += y * stride;
+ }
+ if (w < 0 || h < 0)
+ return;
+
+ for (j = 0; j < h; j++) {
+ for (i = 0; i < w; i++) {
+ uint8_t alpha = cursor[i * 4];
+ APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
+ APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
+ APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
+ }
+ dst += stride;
+ cursor += c->cursor_stride;
+ }
+}
+
+static int g2m_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_picture_ptr, AVPacket *avpkt)
+{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ G2MContext *c = avctx->priv_data;
+ AVFrame *pic = data;
+ GetByteContext bc, tbc;
+ int magic;
+ int got_header = 0;
+ uint32_t chunk_size, cur_size;
+ int chunk_type;
+ int i;
+ int ret;
+
+ if (buf_size < 12) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Frame should have at least 12 bytes, got %d instead\n",
+ buf_size);
+ return AVERROR_INVALIDDATA;
+ }
+
+ bytestream2_init(&bc, buf, buf_size);
+
+ magic = bytestream2_get_be32(&bc);
+ if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') ||
+ (magic & 0xF) < 2 || (magic & 0xF) > 4) {
+ av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic);
+ return AVERROR_INVALIDDATA;
+ }
+
+ if ((magic & 0xF) != 4) {
+ av_log(avctx, AV_LOG_ERROR, "G2M2 and G2M3 are not yet supported\n");
+ return AVERROR(ENOSYS);
+ }
+
+ while (bytestream2_get_bytes_left(&bc) > 5) {
+ chunk_size = bytestream2_get_le32(&bc) - 1;
+ chunk_type = bytestream2_get_byte(&bc);
+ if (chunk_size > bytestream2_get_bytes_left(&bc)) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %d type %02X\n",
+ chunk_size, chunk_type);
+ break;
+ }
+ switch (chunk_type) {
+ case FRAME_INFO:
+ c->got_header = 0;
+ if (chunk_size < 21) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid frame info size %d\n",
+ chunk_size);
+ break;
+ }
+ c->width = bytestream2_get_be32(&bc);
+ c->height = bytestream2_get_be32(&bc);
+ if (c->width < 16 || c->width > avctx->width ||
+ c->height < 16 || c->height > avctx->height) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Invalid frame dimensions %dx%d\n",
+ c->width, c->height);
+ c->width = c->height = 0;
+ bytestream2_skip(&bc, bytestream2_get_bytes_left(&bc));
+ }
+ if (c->width != avctx->width || c->height != avctx->height)
+ avcodec_set_dimensions(avctx, c->width, c->height);
+ c->compression = bytestream2_get_be32(&bc);
+ if (c->compression != 2 && c->compression != 3) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Unknown compression method %d\n",
+ c->compression);
+ return AVERROR_PATCHWELCOME;
+ }
+ c->tile_width = bytestream2_get_be32(&bc);
+ c->tile_height = bytestream2_get_be32(&bc);
+ if (!c->tile_width || !c->tile_height) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Invalid tile dimensions %dx%d\n",
+ c->tile_width, c->tile_height);
+ return AVERROR_INVALIDDATA;
+ }
+ c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
+ c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
+ c->bpp = bytestream2_get_byte(&bc);
+ chunk_size -= 21;
+ bytestream2_skip(&bc, chunk_size);
+ if (g2m_init_buffers(c))
+ return AVERROR(ENOMEM);
+ got_header = 1;
+ break;
+ case TILE_DATA:
+ if (!c->tiles_x || !c->tiles_y) {
+ av_log(avctx, AV_LOG_WARNING,
+ "No frame header - skipping tile\n");
+ bytestream2_skip(&bc, bytestream2_get_bytes_left(&bc));
+ break;
+ }
+ if (chunk_size < 2) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %d\n",
+ chunk_size);
+ break;
+ }
+ c->tile_x = bytestream2_get_byte(&bc);
+ c->tile_y = bytestream2_get_byte(&bc);
+ if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Invalid tile pos %d,%d (in %dx%d grid)\n",
+ c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
+ break;
+ }
+ chunk_size -= 2;
+ ret = 0;
+ switch (c->compression) {
+ case COMPR_EPIC_J_B:
+ av_log(avctx, AV_LOG_ERROR,
+ "ePIC j-b compression is not implemented yet\n");
+ return AVERROR(ENOSYS);
+ case COMPR_KEMPF_J_B:
+ ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
+ buf + bytestream2_tell(&bc),
+ chunk_size);
+ break;
+ }
+ if (ret && c->framebuf)
+ av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
+ c->tile_x, c->tile_y);
+ bytestream2_skip(&bc, chunk_size);
+ break;
+ case CURSOR_POS:
+ if (chunk_size < 5) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %d\n",
+ chunk_size);
+ break;
+ }
+ c->cursor_x = bytestream2_get_be16(&bc);
+ c->cursor_y = bytestream2_get_be16(&bc);
+ bytestream2_skip(&bc, chunk_size - 4);
+ break;
+ case CURSOR_SHAPE:
+ if (chunk_size < 8) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %d\n",
+ chunk_size);
+ break;
+ }
+ bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
+ chunk_size - 4);
+ cur_size = bytestream2_get_be32(&tbc);
+ c->cursor_w = bytestream2_get_byte(&tbc);
+ c->cursor_h = bytestream2_get_byte(&tbc);
+ c->cursor_hot_x = bytestream2_get_byte(&tbc);
+ c->cursor_hot_y = bytestream2_get_byte(&tbc);
+ c->cursor_fmt = bytestream2_get_byte(&tbc);
+ if (cur_size >= chunk_size ||
+ c->cursor_w * c->cursor_h / 4 > cur_size) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %d\n",
+ chunk_size);
+ break;
+ }
+ g2m_load_cursor(c, &tbc);
+ bytestream2_skip(&bc, chunk_size);
+ break;
+ case CHUNK_CC:
+ case CHUNK_CD:
+ bytestream2_skip(&bc, chunk_size);
+ break;
+ default:
+ av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02X\n",
+ chunk_type);
+ bytestream2_skip(&bc, chunk_size);
+ }
+ }
+ if (got_header)
+ c->got_header = 1;
+
+ if (c->width && c->height) {
+ if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
+ }
+
+ pic->key_frame = got_header;
+ pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
+
+ for (i = 0; i < avctx->height; i++)
+ memcpy(pic->data[0] + i * pic->linesize[0],
+ c->framebuf + i * c->framebuf_stride,
+ c->width * 3);
+ g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
+
+ *got_picture_ptr = 1;
+ }
+
+ return buf_size;
+}
+
+static av_cold int g2m_decode_init(AVCodecContext *avctx)
+{
+ G2MContext * const c = avctx->priv_data;
+ int ret;
+
+ if ((ret = jpg_init(avctx, &c->jc)) != 0) {
+ av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
+ jpg_free_context(&c->jc);
+ return AVERROR(ENOMEM);
+ }
+
+ avctx->pix_fmt = PIX_FMT_RGB24;
+
+ return 0;
+}
+
+static av_cold int g2m_decode_end(AVCodecContext *avctx)
+{
+ G2MContext * const c = avctx->priv_data;
+
+ jpg_free_context(&c->jc);
+
+ av_freep(&c->kempf_buf);
+ av_freep(&c->kempf_flags);
+ av_freep(&c->synth_tile);
+ av_freep(&c->jpeg_tile);
+ av_freep(&c->cursor);
+ av_freep(&c->framebuf);
+
+ return 0;
+}
+
+AVCodec ff_g2m_decoder = {
+ .name = "g2m",
+ .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_G2M,
+ .priv_data_size = sizeof(G2MContext),
+ .init = g2m_decode_init,
+ .close = g2m_decode_end,
+ .decode = g2m_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+};
diff --git a/libavcodec/version.h b/libavcodec/version.h
index 6d17bc9..e1b00ee 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -27,8 +27,8 @@
*/
#define LIBAVCODEC_VERSION_MAJOR 55
-#define LIBAVCODEC_VERSION_MINOR 7
-#define LIBAVCODEC_VERSION_MICRO 2
+#define LIBAVCODEC_VERSION_MINOR 8
+#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \
diff --git a/libavformat/riff.c b/libavformat/riff.c
index eae1f64..a64e226 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -312,6 +312,9 @@ const AVCodecTag ff_codec_bmp_tags[] = {
{ AV_CODEC_ID_CLLC, MKTAG('C', 'L', 'L', 'C') },
{ AV_CODEC_ID_MSS2, MKTAG('M', 'S', 'S', '2') },
{ AV_CODEC_ID_SVQ3, MKTAG('S', 'V', 'Q', '3') },
+ { AV_CODEC_ID_G2M, MKTAG('G', '2', 'M', '2') },
+ { AV_CODEC_ID_G2M, MKTAG('G', '2', 'M', '3') },
+ { AV_CODEC_ID_G2M, MKTAG('G', '2', 'M', '4') },
{ AV_CODEC_ID_NONE, 0 }
};
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