libswscale incorrectly presents warning about "Deprecated pixel format"

[jnvsor]

libswscale incorrectly presents warning about "Deprecated pixel format" on padded rgb pixel formats

#ffmpeg-devel leads me to believe BGR0 isn't deprecated so this is a bug

sws_init_context gives a warning if c->srcFormat changes from the start of the function, before that if statement however it calls:
sws_setColorspaceDetails which calls
handle_formats which calls
handle_0alpha which changes the pixel formats and triggers the warning

av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
                             SwsFilter *dstFilter)
{
    ...

    if (!c->contrast && !c->saturation && !c->dstFormatBpp)
        sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,
                                 ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],
                                 c->dstRange, 0, 1 << 16, 1 << 16);

    if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)
        av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");
    ...
}

int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
                             int srcRange, const int table[4], int dstRange,
                             int brightness, int contrast, int saturation)
{
    const AVPixFmtDescriptor *desc_dst;
    const AVPixFmtDescriptor *desc_src;
    memmove(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
    memmove(c->dstColorspaceTable, table, sizeof(int) * 4);

    handle_formats(c);
    ...
}

static void handle_formats(SwsContext *c)
{
    c->src0Alpha |= handle_0alpha(&c->srcFormat);
    c->dst0Alpha |= handle_0alpha(&c->dstFormat);
    c->srcXYZ    |= handle_xyz(&c->srcFormat);
    c->dstXYZ    |= handle_xyz(&c->dstFormat);
    if (c->srcXYZ || c->dstXYZ)
        fill_xyztables(c);
}

static int handle_0alpha(enum AVPixelFormat *format)
{
    switch (*format) {
    case AV_PIX_FMT_0BGR    : *format = AV_PIX_FMT_ABGR   ; return 1;
    case AV_PIX_FMT_BGR0    : *format = AV_PIX_FMT_BGRA   ; return 4;
    case AV_PIX_FMT_0RGB    : *format = AV_PIX_FMT_ARGB   ; return 1;
    case AV_PIX_FMT_RGB0    : *format = AV_PIX_FMT_RGBA   ; return 4;
    default:                                          return 0;
    }
}

Reproduce:

# the only bgr0 pixel format I know of is x11grab but any rgb padded input should do it
ffmpeg -f x11grab -i :0.0 -filter:v "scale=w=0:h=0" -c:v libx264 -pix_fmt yuv444p out.avi
...
[x11grab @ 0xd0cd80] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 640 height: 480
[x11grab @ 0xd0cd80] shared memory extension found
Input #0, x11grab, from ':0.0':
  Duration: N/A, start: 1387920952.573846, bitrate: 294617 kb/s
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 640x480, 294617 kb/s, 29.97 tbr, 1000k tbn, 29.97 tbc
File 'out.avi' already exists. Overwrite ? [y/N] y
[swscaler @ 0xcfd020] deprecated pixel format used, make sure you did set range correctly

[Michael Niedermayer]

Fixed in 51fed95dde7abe838cb55188e28f410fded009c7