[cfe-dev] Compiling FFmpeg
John Kelley
jekelley at apple.com
Fri Dec 5 03:21:52 PST 2008
To familiarize myself with clang I decided to try to compile FFmpeg as
I am familiar with the project and the developers first guess when
something goes wrong is "gcc is probably doing something stupid again".
This might seem like a lot to start off with and I'd tend to agree but
less went wrong (so far) than I expected. The main issue thus far is
that clang has trouble initializing structures. Below may not be the
cleanest code but it was the simplest that I could find that produces
an error:
(from ffmpeg/libavutil/crc.c)
typedef enum {
AV_CRC_8_ATM,
AV_CRC_16_ANSI,
AV_CRC_16_CCITT,
AV_CRC_32_IEEE,
AV_CRC_32_IEEE_LE, /*< reversed bitorder version of
AV_CRC_32_IEEE */
AV_CRC_MAX, /*< not part of public API! don't use outside
lavu */
}AVCRCId;
static struct {
uint8_t le;
uint8_t bits;
uint32_t poly;
} av_crc_table_params[AV_CRC_MAX] = {
[AV_CRC_8_ATM] = { 0, 8, 0x07 },
[AV_CRC_16_ANSI] = { 0, 16, 0x8005 },
[AV_CRC_16_CCITT] = { 0, 16, 0x1021 },
[AV_CRC_32_IEEE] = { 0, 32, 0x04C11DB7 },
[AV_CRC_32_IEEE_LE] = { 1, 32, 0xEDB88320 },
};
This produces the following error:
crc.c:31:37: error: cannot codegen this initializer list with
designators yet
} av_crc_table_params[AV_CRC_MAX] = {
^
I have no problem pitching in to fix this but wanted to make sure that
no one else is currently working on it and to ask where I should look
to implement this.
Also I was planning on taking a shot at the File Manager Speedup
project listed in NOTES.txt unless there are any objections.
Cheers,
John Kelley
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