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Code Issues Releases Activity

avcodec/imm4: add support for mid-stream size changes

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This commit is contained in:
Paul B Mahol 2019-03-01 15:01:17 +01:00
parent 056a2ac168
commit 93402561fd
1 changed files with 15 additions and 12 deletions
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27
libavcodec/imm4.c
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@ -41,7 +41,6 @@ typedef struct IMM4Context {
uint8_t *bitstream;
int bitstream_size;
int changed_size;
int factor;
unsigned lo;
unsigned hi;
@ -370,6 +369,7 @@ static int decode_frame(AVCodecContext *avctx, void *data,
IMM4Context *s = avctx->priv_data;
GetBitContext *gb = &s->gb;
AVFrame *frame = data;
int width, height;
unsigned type;
int ret, scaled;
@ -391,9 +391,11 @@ static int decode_frame(AVCodecContext *avctx, void *data,
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
avctx->color_range = AVCOL_RANGE_JPEG;
width = avctx->width;
height = avctx->height;
scaled = avpkt->data[8];
if (scaled < 2) {
int width, height;
int mode = avpkt->data[10];
switch (mode) {
@ -422,18 +424,8 @@ static int decode_frame(AVCodecContext *avctx, void *data,
height = 576;
break;
}
if (s->changed_size == 1 &&
(avctx->width != width || avctx->height != height)) {
av_log(avctx, AV_LOG_ERROR, "Frame size change is unsupported.\n");
return AVERROR_INVALIDDATA;
}
ret = ff_set_dimensions(avctx, width, height);
if (ret < 0)
return ret;
}
s->changed_size = 1;
skip_bits_long(gb, 24 * 8);
type = get_bits_long(gb, 32);
s->hi = get_bits(gb, 16);
@ -453,6 +445,17 @@ static int decode_frame(AVCodecContext *avctx, void *data,
return AVERROR_PATCHWELCOME;
}
if (!frame->key_frame &&
(avctx->width != width ||
avctx->height != height)) {
av_log(avctx, AV_LOG_ERROR, "Frame size change is unsupported.\n");
return AVERROR_INVALIDDATA;
}
ret = ff_set_dimensions(avctx, width, height);
if (ret < 0)
return ret;
if ((ret = ff_get_buffer(avctx, frame, frame->key_frame ? AV_GET_BUFFER_FLAG_REF : 0)) < 0)
return ret;