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lavf/async: Fix ring_write return value

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This fixes a regression from commit 36117968ad.

wrapped_url_read() used to be able to return positive number from
ffurl_read(). It relies on the result to check if EOF is reached in
async_buffer_task().

But FIFO callbacks must return 0 on success. This should be handled
in ring_write() instead.

Test case:
  ffmpeg -f lavfi -i testsrc -t 1 test.mp4
  ffmpeg -i async:test.mp4

Signed-off-by: Guangyu Sun <gsun@roblox.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Guangyu Sun 2022-09-29 11:11:34 -07:00 committed by Anton Khirnov
parent fed841f6f9
commit fc6f7e2a3b
1 changed files with 7 additions and 1 deletions
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8
libavformat/async.c
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@ -144,8 +144,14 @@ static int wrapped_url_read(void *src, void *dst, size_t *size)
static int ring_write(RingBuffer *ring, URLContext *h, size_t size)
{
int ret;
av_assert2(size <= ring_space(ring));
return av_fifo_write_from_cb(ring->fifo, wrapped_url_read, h, &size);
ret = av_fifo_write_from_cb(ring->fifo, wrapped_url_read, h, &size);
if (ret < 0)
return ret;
return size;
}
static int ring_size_of_read_back(RingBuffer *ring)