[FFmpeg-devel] [PATCH 1/2] avcodec/dpxenc: write framerate to header

Paul B Mahol onemda at gmail.com
Sat Feb 20 20:04:32 EET 2021


On Sat, Feb 20, 2021 at 7:02 PM Andreas Rheinhardt <
andreas.rheinhardt at gmail.com> wrote:

> James Almer:
> > On 2/20/2021 1:37 PM, Paul B Mahol wrote:
> >> Signed-off-by: Paul B Mahol <onemda at gmail.com>
> >> ---
> >>   libavcodec/dpxenc.c           | 21 ++++++++++++++++++---
> >>   tests/ref/lavf/gbrp10le.dpx   |  4 ++--
> >>   tests/ref/lavf/gbrp12le.dpx   |  4 ++--
> >>   tests/ref/lavf/rgb48le.dpx    |  4 ++--
> >>   tests/ref/lavf/rgb48le_10.dpx |  4 ++--
> >>   tests/ref/lavf/rgba64le.dpx   |  4 ++--
> >>   6 files changed, 28 insertions(+), 13 deletions(-)
> >>
> >> diff --git a/libavcodec/dpxenc.c b/libavcodec/dpxenc.c
> >> index a5960334d5..b296f9f22e 100644
> >> --- a/libavcodec/dpxenc.c
> >> +++ b/libavcodec/dpxenc.c
> >> @@ -173,14 +173,25 @@ static void encode_gbrp12(AVCodecContext *avctx,
> >> const AVFrame *pic, uint16_t *d
> >>       }
> >>   }
> >>   +#define FILE_HEADER_SIZE 768
> >> +#define IMAGE_HEADER_SIZE 640
> >> +#define ORIENTATION_HEADER_SIZE 256
> >> +#define FILM_INFO_HEADER_SIZE 256
> >> +#define TV_INFO_HEADER_SIZE 128
> >> +#define HEADER_SIZE (FILE_HEADER_SIZE + \
> >> +                     IMAGE_HEADER_SIZE + \
> >> +                     ORIENTATION_HEADER_SIZE + \
> >> +                     FILM_INFO_HEADER_SIZE + \
> >> +                     TV_INFO_HEADER_SIZE)
> >> +
> >>   static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
> >>                           const AVFrame *frame, int *got_packet)
> >>   {
> >>       DPXContext *s = avctx->priv_data;
> >> -    int size, ret, need_align, len;
> >> +    int ret, need_align, len;
> >> +    int64_t size;
> >>       uint8_t *buf;
> >>   -#define HEADER_SIZE 1664  /* DPX Generic header */
> >>       if (s->bits_per_component == 10)
> >>           size = avctx->height * avctx->width * 4;
> >>       else if (s->bits_per_component == 12) {
> >> @@ -196,7 +207,7 @@ static int encode_frame(AVCodecContext *avctx,
> >> AVPacket *pkt,
> >>           need_align = size - len;
> >>           size *= avctx->height;
> >>       }
> >> -    if ((ret = ff_alloc_packet2(avctx, pkt, size + HEADER_SIZE, 0)) <
> 0)
> >> +    if ((ret = ff_alloc_packet2(avctx, pkt, HEADER_SIZE + size, 0)) <
> 0)
> >
> > This looks like pointless change. But you could while at it set min_size
> > to the same value as size.
> >
> >>           return ret;
> >>       buf = pkt->data;
> >>   @@ -229,6 +240,10 @@ static int encode_frame(AVCodecContext *avctx,
> >> AVPacket *pkt,
> >>       write32(buf + 1628, avctx->sample_aspect_ratio.num);
> >>       write32(buf + 1632, avctx->sample_aspect_ratio.den);
> >>   +    /* Film information header */
> >> +    if (avctx->framerate.num && avctx->framerate.den)
> >> +        write32(buf + 1724, av_float2int(av_q2d(avctx->framerate)));
> >> +
> >>       switch(s->bits_per_component) {
> >>       case 8:
> >>       case 16:
> >> diff --git a/tests/ref/lavf/gbrp10le.dpx b/tests/ref/lavf/gbrp10le.dpx
> >> index b33da34e20..7c03dc0779 100644
> >> --- a/tests/ref/lavf/gbrp10le.dpx
> >> +++ b/tests/ref/lavf/gbrp10le.dpx
> >> @@ -1,3 +1,3 @@
> >> -7ca935d5d5e00c54acbc85565d3039b6
> >> *tests/data/images/gbrp10le.dpx/02.gbrp10le.dpx
> >> +c7c8ecd9d8c8a2c4dce6d92bfb9877d7
> >> *tests/data/images/gbrp10le.dpx/02.gbrp10le.dpx
> >>   tests/data/images/gbrp10le.dpx/%02d.gbrp10le.dpx CRC=0xe6663fba
> >> -407168 tests/data/images/gbrp10le.dpx/02.gbrp10le.dpx
> >> +407552 tests/data/images/gbrp10le.dpx/02.gbrp10le.dpx
> >
> > Nearly 400 more bytes to write a 4 byte long frame rate field?
> >
>
> That's because HEADER_SIZE has been increased from 1664 to 2048. Don't
> know if it's necessary.
>

Please consult specification of DPX, you will find all there.


>
> >> diff --git a/tests/ref/lavf/gbrp12le.dpx b/tests/ref/lavf/gbrp12le.dpx
> >> index e2e794ecc6..5ca855b004 100644
> >> --- a/tests/ref/lavf/gbrp12le.dpx
> >> +++ b/tests/ref/lavf/gbrp12le.dpx
> >> @@ -1,3 +1,3 @@
> >> -a4cfea1797c928f2eff73573e559675d
> >> *tests/data/images/gbrp12le.dpx/02.gbrp12le.dpx
> >> +79dcf3b32ed8e627a68bba19bf625ca5
> >> *tests/data/images/gbrp12le.dpx/02.gbrp12le.dpx
> >>   tests/data/images/gbrp12le.dpx/%02d.gbrp12le.dpx CRC=0x1c755633
> >> -609920 tests/data/images/gbrp12le.dpx/02.gbrp12le.dpx
> >> +610304 tests/data/images/gbrp12le.dpx/02.gbrp12le.dpx
> >> diff --git a/tests/ref/lavf/rgb48le.dpx b/tests/ref/lavf/rgb48le.dpx
> >> index 073153898a..33817d95a9 100644
> >> --- a/tests/ref/lavf/rgb48le.dpx
> >> +++ b/tests/ref/lavf/rgb48le.dpx
> >> @@ -1,3 +1,3 @@
> >> -075963c3c08978b6a20555ba09161434
> >> *tests/data/images/rgb48le.dpx/02.rgb48le.dpx
> >> +51c703863c9df1db5ef78a77dd5fbd0f
> >> *tests/data/images/rgb48le.dpx/02.rgb48le.dpx
> >>   tests/data/images/rgb48le.dpx/%02d.rgb48le.dpx CRC=0xe5b9c023
> >> -609920 tests/data/images/rgb48le.dpx/02.rgb48le.dpx
> >> +610304 tests/data/images/rgb48le.dpx/02.rgb48le.dpx
> >> diff --git a/tests/ref/lavf/rgb48le_10.dpx
> >> b/tests/ref/lavf/rgb48le_10.dpx
> >> index ce36e5079f..3c934168b7 100644
> >> --- a/tests/ref/lavf/rgb48le_10.dpx
> >> +++ b/tests/ref/lavf/rgb48le_10.dpx
> >> @@ -1,3 +1,3 @@
> >> -b9f22728f8ff393bf30cf6cbd624fa95
> >> *tests/data/images/rgb48le_10.dpx/02.rgb48le_10.dpx
> >> +a0ca7132c33a5c0eb25dd4a2b6117743
> >> *tests/data/images/rgb48le_10.dpx/02.rgb48le_10.dpx
> >>   tests/data/images/rgb48le_10.dpx/%02d.rgb48le_10.dpx CRC=0xf38d5830
> >> -407168 tests/data/images/rgb48le_10.dpx/02.rgb48le_10.dpx
> >> +407552 tests/data/images/rgb48le_10.dpx/02.rgb48le_10.dpx
> >> diff --git a/tests/ref/lavf/rgba64le.dpx b/tests/ref/lavf/rgba64le.dpx
> >> index b4092c9fd8..85974bbc98 100644
> >> --- a/tests/ref/lavf/rgba64le.dpx
> >> +++ b/tests/ref/lavf/rgba64le.dpx
> >> @@ -1,3 +1,3 @@
> >> -545603630f30dec2768c8ae8d12eb8ea
> >> *tests/data/images/rgba64le.dpx/02.rgba64le.dpx
> >> +cb5fe2ad9c1119a33916a838cb586c45
> >> *tests/data/images/rgba64le.dpx/02.rgba64le.dpx
> >>   tests/data/images/rgba64le.dpx/%02d.rgba64le.dpx CRC=0xe72ce131
> >> -812672 tests/data/images/rgba64le.dpx/02.rgba64le.dpx
> >> +813056 tests/data/images/rgba64le.dpx/02.rgba64le.dpx
> >>
> >
> > _______________________________________________
> > ffmpeg-devel mailing list
> > ffmpeg-devel at ffmpeg.org
> > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> >
> > To unsubscribe, visit link above, or email
> > ffmpeg-devel-request at ffmpeg.org with subject "unsubscribe".
>
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request at ffmpeg.org with subject "unsubscribe".


More information about the ffmpeg-devel mailing list