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| author | Kirill Gavrilov <kirill@sview.ru> | 2015-10-22 23:36:52 +0300 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2015-10-28 12:59:43 +0100 |
| commit | bea931c2eb776603074c463e127cb348d195bde7 (patch) | |
| tree | b860ca49096ee3ace2b6d8305689a99038a60a63 | |
| parent | 54cd1ab55513e0a12f90dba8036b0a54b16d8ff7 (diff) | |
| download | ffmpeg-bea931c2eb776603074c463e127cb348d195bde7.tar.gz | |
avcodec/png: read and write stereo3d frame side data information
Use optional sTER chunk defining side-by-side stereo pair
within "Extensions to the PNG 1.2 Specification", version 1.3.0.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/pngdec.c | 16 | ||||
| -rw-r--r-- | libavcodec/pngenc.c | 19 |
2 files changed, 35 insertions, 0 deletions
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index 4cfdc588a5..99111d4ecc 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -24,6 +24,7 @@ #include "libavutil/avassert.h" #include "libavutil/bprint.h" #include "libavutil/imgutils.h" +#include "libavutil/stereo3d.h" #include "avcodec.h" #include "bytestream.h" #include "internal.h" @@ -1164,6 +1165,21 @@ static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s, av_log(avctx, AV_LOG_WARNING, "Broken zTXt chunk\n"); bytestream2_skip(&s->gb, length + 4); break; + case MKTAG('s', 'T', 'E', 'R'): { + AVStereo3D *stereo3d = av_stereo3d_create_side_data(p); + if (!stereo3d) { + goto fail; + } else if (*s->gb.buffer == 0) { + stereo3d->type = AV_STEREO3D_SIDEBYSIDE; + stereo3d->flags = AV_STEREO3D_FLAG_INVERT; + } else if (*s->gb.buffer == 1) { + stereo3d->type = AV_STEREO3D_SIDEBYSIDE; + } else { + av_log(avctx, AV_LOG_WARNING, "Broken sTER chunk - unknown value\n"); + } + bytestream2_skip(&s->gb, length + 4); + break; + } case MKTAG('I', 'E', 'N', 'D'): if (!(s->state & PNG_ALLIMAGE)) av_log(avctx, AV_LOG_ERROR, "IEND without all image\n"); diff --git a/libavcodec/pngenc.c b/libavcodec/pngenc.c index 4204df2a30..bc61f8fd77 100644 --- a/libavcodec/pngenc.c +++ b/libavcodec/pngenc.c @@ -31,6 +31,7 @@ #include "libavutil/libm.h" #include "libavutil/opt.h" #include "libavutil/color_utils.h" +#include "libavutil/stereo3d.h" #include <zlib.h> @@ -340,6 +341,7 @@ static int png_get_gama(enum AVColorTransferCharacteristic trc, uint8_t *buf) static int encode_headers(AVCodecContext *avctx, const AVFrame *pict) { + AVFrameSideData *side_data; PNGEncContext *s = avctx->priv_data; /* write png header */ @@ -364,6 +366,23 @@ static int encode_headers(AVCodecContext *avctx, const AVFrame *pict) } png_write_chunk(&s->bytestream, MKTAG('p', 'H', 'Y', 's'), s->buf, 9); + /* write stereoscopic information */ + side_data = av_frame_get_side_data(pict, AV_FRAME_DATA_STEREO3D); + if (side_data) { + AVStereo3D *stereo3d = (AVStereo3D *)side_data->data; + switch (stereo3d->type) { + case AV_STEREO3D_SIDEBYSIDE: + s->buf[0] = ((stereo3d->flags & AV_STEREO3D_FLAG_INVERT) == 0) ? 1 : 0; + png_write_chunk(&s->bytestream, MKTAG('s', 'T', 'E', 'R'), s->buf, 1); + break; + case AV_STEREO3D_2D: + break; + default: + av_log(avctx, AV_LOG_WARNING, "Only side-by-side stereo3d flag can be defined within sTER chunk\n"); + break; + } + } + /* write colorspace information */ if (pict->color_primaries == AVCOL_PRI_BT709 && pict->color_trc == AVCOL_TRC_IEC61966_2_1) { |