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lavd/v4l2: produce a 0 byte packet when a dequeued buffer is flagged with V4L2_BUF_FLAG_ERROR 

Fixes ticket #4030.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Giorgio Vazzana 2015-05-08 17:25:15 +02:00 committed by Michael Niedermayer
parent 982e7bbfa6
commit 28f20d2ff4
1 changed files with 22 additions and 15 deletions
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37
libavdevice/v4l2.c
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@ -499,13 +499,14 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
};
int res;
pkt->size = 0;
/* FIXME: Some special treatment might be needed in case of loss of signal... */
while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
if (res < 0) {
if (errno == EAGAIN) {
pkt->size = 0;
if (errno == EAGAIN)
return AVERROR(EAGAIN);
}
res = AVERROR(errno);
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
av_err2str(res));
@ -520,18 +521,24 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
// always keep at least one buffer queued
av_assert0(avpriv_atomic_int_get(&s->buffers_queued) >= 1);
/* CPIA is a compressed format and we don't know the exact number of bytes
* used by a frame, so set it here as the driver announces it.
*/
if (ctx->video_codec_id == AV_CODEC_ID_CPIA)
s->frame_size = buf.bytesused;
if (buf.flags & V4L2_BUF_FLAG_ERROR) {
av_log(ctx, AV_LOG_WARNING,
"Dequeued v4l2 buffer contains corrupted data (%d bytes).\n",
buf.bytesused);
buf.bytesused = 0;
} else {
/* CPIA is a compressed format and we don't know the exact number of bytes
* used by a frame, so set it here as the driver announces it. */
if (ctx->video_codec_id == AV_CODEC_ID_CPIA)
s->frame_size = buf.bytesused;
if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
av_log(ctx, AV_LOG_ERROR,
"The v4l2 frame is %d bytes, but %d bytes are expected. Flags: 0x%08X\n",
buf.bytesused, s->frame_size, buf.flags);
enqueue_buffer(s, &buf);
return AVERROR_INVALIDDATA;
if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
av_log(ctx, AV_LOG_ERROR,
"Dequeued v4l2 buffer contains %d bytes, but %d were expected. Flags: 0x%08X.\n",
buf.bytesused, s->frame_size, buf.flags);
enqueue_buffer(s, &buf);
return AVERROR_INVALIDDATA;
}
}
/* Image is at s->buff_start[buf.index] */
@ -586,7 +593,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
convert_timestamp(ctx, &pkt->pts);
return s->buf_len[buf.index];
return pkt->size;
}
static int mmap_start(AVFormatContext *ctx)