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Code Issues Releases Activity

avcodec/jpeglsenc: Allocate buffer with fixed size only once

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Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2021-04-29 17:27:00 +02:00
parent 79402e2c36
commit 634a187b9b
1 changed files with 35 additions and 11 deletions
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46
libavcodec/jpeglsenc.c
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@@ -40,6 +40,10 @@ typedef struct JPEGLSContext {
AVClass *class;
int pred;
int comps;
size_t size;
uint8_t *buf;
} JPEGLSContext;
static inline void put_marker_byteu(PutByteContext *pb, enum JpegMarker code)
@@ -282,25 +286,18 @@ static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
int i, size, ret;
int comps;
if (avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
avctx->pix_fmt == AV_PIX_FMT_GRAY16)
comps = 1;
else
comps = 3;
if ((ret = ff_alloc_packet2(avctx, pkt, avctx->width *avctx->height * comps * 4 +
AV_INPUT_BUFFER_MIN_SIZE, 0)) < 0)
if ((ret = ff_alloc_packet2(avctx, pkt, ctx->size, 0)) < 0)
return ret;
last = av_malloc((unsigned)pkt->size + FFABS(p->linesize[0]));
last = av_mallocz(FFABS(p->linesize[0]));
if (!last)
return AVERROR(ENOMEM);
memset(last, 0, FFABS(p->linesize[0]));
bytestream2_init_writer(&pb, pkt->data, pkt->size);
init_put_bits(&pb2, last + FFABS(p->linesize[0]), pkt->size);
init_put_bits(&pb2, ctx->buf, ctx->size);
/* write our own JPEG header, can't use mjpeg_picture_header */
comps = ctx->comps;
put_marker_byteu(&pb, SOI);
put_marker_byteu(&pb, SOF48);
bytestream2_put_be16u(&pb, 8 + comps * 3); // header size depends on components
@@ -415,10 +412,36 @@ static int encode_picture_ls(AVCodecContext *avctx, AVPacket *pkt,
static av_cold int encode_jpegls_init(AVCodecContext *avctx)
{
JPEGLSContext *ctx = avctx->priv_data;
size_t size;
if ((avctx->width | avctx->height) > UINT16_MAX) {
av_log(avctx, AV_LOG_ERROR, "Dimensions exceeding 65535x65535\n");
return AVERROR(EINVAL);
}
if (avctx->pix_fmt == AV_PIX_FMT_GRAY8 ||
avctx->pix_fmt == AV_PIX_FMT_GRAY16)
ctx->comps = 1;
else
ctx->comps = 3;
size = AV_INPUT_BUFFER_MIN_SIZE;
/* INT_MAX due to PutBit-API. */
if (avctx->width * (unsigned)avctx->height > (INT_MAX - size) / 4 / ctx->comps)
return AVERROR(ERANGE);
size += 4 * ctx->comps * avctx->width * avctx->height;
ctx->size = size;
ctx->buf = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!ctx->buf)
return AVERROR(ENOMEM);
return 0;
}
static av_cold int encode_jpegls_close(AVCodecContext *avctx)
{
JPEGLSContext *ctx = avctx->priv_data;
av_freep(&ctx->buf);
return 0;
}
@@ -450,6 +473,7 @@ const AVCodec ff_jpegls_encoder = {
.capabilities = AV_CODEC_CAP_FRAME_THREADS,
.init = encode_jpegls_init,
.encode2 = encode_picture_ls,
.close = encode_jpegls_close,
.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16,