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Code Issues Releases Activity

g2meet: factor out seeking to the chunk end

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Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>
This commit is contained in:
Maxim Poliakovski 2013-10-22 00:54:51 +02:00 committed by Kostya Shishkov
parent 77bb0004bb
commit d6d7851801
1 changed files with 8 additions and 13 deletions
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21
libavcodec/g2meet.c
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@ -645,7 +645,7 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
int magic;
int got_header = 0;
uint32_t chunk_size;
int chunk_type;
int chunk_type, chunk_start;
int i;
int ret;
@ -671,8 +671,9 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
}
while (bytestream2_get_bytes_left(&bc) > 5) {
chunk_size = bytestream2_get_le32(&bc) - 1;
chunk_type = bytestream2_get_byte(&bc);
chunk_size = bytestream2_get_le32(&bc) - 1;
chunk_type = bytestream2_get_byte(&bc);
chunk_start = bytestream2_tell(&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);
@ -718,8 +719,6 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
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)) {
ret = AVERROR(ENOMEM);
goto header_fail;
@ -730,7 +729,6 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
if (!c->tiles_x || !c->tiles_y) {
av_log(avctx, AV_LOG_WARNING,
"No display info - skipping tile\n");
bytestream2_skip(&bc, bytestream2_get_bytes_left(&bc));
break;
}
if (chunk_size < 2) {
@ -746,7 +744,6 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
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:
@ -756,13 +753,12 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
case COMPR_KEMPF_J_B:
ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
buf + bytestream2_tell(&bc),
chunk_size);
chunk_size - 2);
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) {
@ -772,7 +768,6 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
}
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) {
@ -783,17 +778,17 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
chunk_size - 4);
g2m_load_cursor(avctx, 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);
}
/* navigate to next chunk */
bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc));
}
if (got_header)
c->got_header = 1;