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Code Issues Releases Activity

utvideoenc: Avoid writing into the input picture

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-08-25 21:34:35 +00:00 committed by Derek Buitenhuis
parent 11d957fbd8
commit bbefd27e52
2 changed files with 42 additions and 26 deletions
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2
libavcodec/utvideo.h
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@ -75,7 +75,7 @@ typedef struct UtvideoContext {
int interlaced;
int frame_pred;
uint8_t *slice_bits, *slice_buffer;
uint8_t *slice_bits, *slice_buffer[4];
int slice_bits_size;
} UtvideoContext;

66
libavcodec/utvideoenc.c
View File

@ -44,10 +44,12 @@ static int huff_cmp_sym(const void *a, const void *b)
static av_cold int utvideo_encode_close(AVCodecContext *avctx)
{
UtvideoContext *c = avctx->priv_data;
int i;
av_freep(&avctx->coded_frame);
av_freep(&c->slice_bits);
av_freep(&c->slice_buffer);
for (i = 0; i < 4; i++)
av_freep(&c->slice_buffer[i]);
return 0;
}
@ -55,7 +57,7 @@ static av_cold int utvideo_encode_close(AVCodecContext *avctx)
static av_cold int utvideo_encode_init(AVCodecContext *avctx)
{
UtvideoContext *c = avctx->priv_data;
int i;
uint32_t original_format;
c->avctx = avctx;
@ -142,13 +144,14 @@ static av_cold int utvideo_encode_init(AVCodecContext *avctx)
return AVERROR(ENOMEM);
}
c->slice_buffer = av_malloc(avctx->width * avctx->height +
FF_INPUT_BUFFER_PADDING_SIZE);
if (!c->slice_buffer) {
av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer 1.\n");
utvideo_encode_close(avctx);
return AVERROR(ENOMEM);
for (i = 0; i < c->planes; i++) {
c->slice_buffer[i] = av_malloc(avctx->width * (avctx->height + 1) +
FF_INPUT_BUFFER_PADDING_SIZE);
if (!c->slice_buffer[i]) {
av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer 1.\n");
utvideo_encode_close(avctx);
return AVERROR(ENOMEM);
}
}
/*
@ -193,20 +196,33 @@ static av_cold int utvideo_encode_init(AVCodecContext *avctx)
return 0;
}
static void mangle_rgb_planes(uint8_t *src, int step, int stride, int width,
int height)
static void mangle_rgb_planes(uint8_t *dst[4], uint8_t *src, int step,
int stride, int width, int height)
{
int i, j;
uint8_t r, g, b;
int k = width;
unsigned int g;
for (j = 0; j < height; j++) {
for (i = 0; i < width * step; i += step) {
r = src[i];
g = src[i + 1];
b = src[i + 2];
src[i] = r - g + 0x80;
src[i + 2] = b - g + 0x80;
if (step == 3) {
for (i = 0; i < width * step; i += step) {
g = src[i + 1];
dst[0][k] = g;
g += 0x80;
dst[1][k] = src[i + 2] - g;
dst[2][k] = src[i + 0] - g;
k++;
}
} else {
for (i = 0; i < width * step; i += step) {
g = src[i + 1];
dst[0][k] = g;
g += 0x80;
dst[1][k] = src[i + 2] - g;
dst[2][k] = src[i + 0] - g;
dst[3][k] = src[i + 3];
k++;
}
}
src += stride;
}
@ -535,16 +551,16 @@ static int utvideo_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
/* In case of RGB, mangle the planes to Ut Video's format */
if (avctx->pix_fmt == PIX_FMT_RGBA || avctx->pix_fmt == PIX_FMT_RGB24)
mangle_rgb_planes(pic->data[0], c->planes, pic->linesize[0], width,
height);
mangle_rgb_planes(c->slice_buffer, pic->data[0], c->planes,
pic->linesize[0], width, height);
/* Deal with the planes */
switch (avctx->pix_fmt) {
case PIX_FMT_RGB24:
case PIX_FMT_RGBA:
for (i = 0; i < c->planes; i++) {
ret = encode_plane(avctx, pic->data[0] + ff_ut_rgb_order[i],
c->slice_buffer, c->planes, pic->linesize[0],
ret = encode_plane(avctx, c->slice_buffer[i] + width,
c->slice_buffer[i], 1, width,
width, height, &pb);
if (ret) {
@ -555,7 +571,7 @@ static int utvideo_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
break;
case PIX_FMT_YUV422P:
for (i = 0; i < c->planes; i++) {
ret = encode_plane(avctx, pic->data[i], c->slice_buffer, 1,
ret = encode_plane(avctx, pic->data[i], c->slice_buffer[0], 1,
pic->linesize[i], width >> !!i, height, &pb);
if (ret) {
@ -566,7 +582,7 @@ static int utvideo_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
break;
case PIX_FMT_YUV420P:
for (i = 0; i < c->planes; i++) {
ret = encode_plane(avctx, pic->data[i], c->slice_buffer, 1,
ret = encode_plane(avctx, pic->data[i], c->slice_buffer[0], 1,
pic->linesize[i], width >> !!i, height >> !!i,
&pb);