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Fix decoding of progressive jpgs with unusual pixel formats. 

Fixes ticket #892.
This commit is contained in:
Carl Eugen Hoyos 2012-01-12 23:20:33 +01:00
parent 7cbb32e461
commit 2c90204598
1 changed files with 33 additions and 22 deletions
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55
libavcodec/mjpegdec.c
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@ -219,6 +219,7 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
int len, nb_components, i, width, height, pix_fmt_id;
s->cur_scan = 0;
s->upscale_h = s->upscale_v = 0;
/* XXX: verify len field validity */
len = get_bits(&s->gb, 16);
@ -401,6 +402,7 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
return -1;
}
if (s->ls) {
s->upscale_h = s->upscale_v = 0;
if (s->nb_components > 1)
s->avctx->pix_fmt = PIX_FMT_RGB24;
else if (s->bits <= 8)
@ -1233,28 +1235,6 @@ int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
return -1;
}
}
if (s->upscale_h) {
uint8_t *line = s->picture_ptr->data[s->upscale_h];
for (i = 0; i < s->chroma_height; i++) {
for (index = s->width - 1; index; index--)
line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
line += s->linesize[s->upscale_h];
}
}
if (s->upscale_v) {
uint8_t *dst = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(s->height - 1) * s->linesize[s->upscale_v]];
for (i = s->height - 1; i; i--) {
uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[i / 2 * s->linesize[s->upscale_v]];
uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(i + 1) / 2 * s->linesize[s->upscale_v]];
if (src1 == src2) {
memcpy(dst, src1, s->width);
} else {
for (index = 0; index < s->width; index++)
dst[index] = (src1[index] + src2[index]) >> 1;
}
dst -= s->linesize[s->upscale_v];
}
}
emms_c();
return 0;
out_of_range:
@ -1576,6 +1556,7 @@ int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
const uint8_t *unescaped_buf_ptr;
int unescaped_buf_size;
int start_code;
int i, index;
AVFrame *picture = data;
s->got_picture = 0; // picture from previous image can not be reused
@ -1735,6 +1716,36 @@ eoi_parser:
av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
return -1;
the_end:
if (s->upscale_h) {
uint8_t *line = s->picture_ptr->data[s->upscale_h];
av_assert0(avctx->pix_fmt == PIX_FMT_YUVJ444P ||
avctx->pix_fmt == PIX_FMT_YUV444P ||
avctx->pix_fmt == PIX_FMT_YUVJ440P ||
avctx->pix_fmt == PIX_FMT_YUV440P);
for (i = 0; i < s->chroma_height; i++) {
for (index = s->width - 1; index; index--)
line[index] = (line[index / 2] + line[(index + 1) / 2]) >> 1;
line += s->linesize[s->upscale_h];
}
}
if (s->upscale_v) {
uint8_t *dst = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(s->height - 1) * s->linesize[s->upscale_v]];
av_assert0(avctx->pix_fmt == PIX_FMT_YUVJ444P ||
avctx->pix_fmt == PIX_FMT_YUV444P ||
avctx->pix_fmt == PIX_FMT_YUVJ422P ||
avctx->pix_fmt == PIX_FMT_YUV422P);
for (i = s->height - 1; i; i--) {
uint8_t *src1 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[i / 2 * s->linesize[s->upscale_v]];
uint8_t *src2 = &((uint8_t *)s->picture_ptr->data[s->upscale_v])[(i + 1) / 2 * s->linesize[s->upscale_v]];
if (src1 == src2) {
memcpy(dst, src1, s->width);
} else {
for (index = 0; index < s->width; index++)
dst[index] = (src1[index] + src2[index]) >> 1;
}
dst -= s->linesize[s->upscale_v];
}
}
av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n",
buf_end - buf_ptr);
// return buf_end - buf_ptr;