[FFmpeg-devel] [PATCH 6/7] fftools/ffmpeg: support applying container level cropping

[James Almer <jamrial@gmail.com>]

Signed-off-by: James Almer <jamrial@gmail.com>
---
 fftools/ffmpeg.h        |  3 +++
 fftools/ffmpeg_demux.c  |  6 ++++++
 fftools/ffmpeg_enc.c    | 24 +++++++++++++-----------
 fftools/ffmpeg_filter.c | 23 +++++++++++++++++++++++
 fftools/ffmpeg_opt.c    |  3 +++
 5 files changed, 48 insertions(+), 11 deletions(-)

diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
index b059ecbb9f..94ada9d586 100644
--- a/fftools/ffmpeg.h
+++ b/fftools/ffmpeg.h
@@ -155,6 +155,8 @@ typedef struct OptionsContext {
     int        nb_hwaccel_output_formats;
     SpecifierOpt *autorotate;
     int        nb_autorotate;
+    SpecifierOpt *apply_cropping;
+    int        nb_apply_cropping;
 
     /* output options */
     StreamMap *stream_maps;
@@ -352,6 +354,7 @@ typedef struct InputStream {
 #endif
 
     int autorotate;
+    int apply_cropping;
 
     int fix_sub_duration;
 
diff --git a/fftools/ffmpeg_demux.c b/fftools/ffmpeg_demux.c
index c71edf01a5..53fe584959 100644
--- a/fftools/ffmpeg_demux.c
+++ b/fftools/ffmpeg_demux.c
@@ -48,6 +48,7 @@ static const char *const opt_name_hwaccels[]                  = {"hwaccel", NULL
 static const char *const opt_name_hwaccel_devices[]           = {"hwaccel_device", NULL};
 static const char *const opt_name_hwaccel_output_formats[]    = {"hwaccel_output_format", NULL};
 static const char *const opt_name_autorotate[]                = {"autorotate", NULL};
+static const char *const opt_name_apply_cropping[]            = {"apply_cropping", NULL};
 static const char *const opt_name_display_rotations[]         = {"display_rotation", NULL};
 static const char *const opt_name_display_hflips[]            = {"display_hflip", NULL};
 static const char *const opt_name_display_vflips[]            = {"display_vflip", NULL};
@@ -1068,6 +1069,11 @@ static int ist_add(const OptionsContext *o, Demuxer *d, AVStream *st)
     ist->autorotate = 1;
     MATCH_PER_STREAM_OPT(autorotate, i, ist->autorotate, ic, st);
 
+    ist->apply_cropping = 1;
+    MATCH_PER_STREAM_OPT(apply_cropping, i, ist->apply_cropping, ic, st);
+
+    av_dict_set_int(&o->g->codec_opts, "apply_cropping", ist->apply_cropping, 0);
+
     MATCH_PER_STREAM_OPT(codec_tags, str, codec_tag, ic, st);
     if (codec_tag) {
         uint32_t tag = strtol(codec_tag, &next, 0);
diff --git a/fftools/ffmpeg_enc.c b/fftools/ffmpeg_enc.c
index be35465c28..27dd28172c 100644
--- a/fftools/ffmpeg_enc.c
+++ b/fftools/ffmpeg_enc.c
@@ -467,17 +467,19 @@ int enc_open(OutputStream *ost, AVFrame *frame)
     if (ist) {
         int i;
         for (i = 0; i < ist->st->codecpar->nb_coded_side_data; i++) {
-            AVPacketSideData *sd_src = &ist->st->codecpar->coded_side_data[i];
-            if (sd_src->type != AV_PKT_DATA_CPB_PROPERTIES) {
-                AVPacketSideData *sd_dst = av_packet_side_data_new(&ost->par_in->coded_side_data,
-                                                                   &ost->par_in->nb_coded_side_data,
-                                                                   sd_src->type, sd_src->size, 0);
-                if (!sd_dst)
-                    return AVERROR(ENOMEM);
-                memcpy(sd_dst->data, sd_src->data, sd_src->size);
-                if (ist->autorotate && sd_src->type == AV_PKT_DATA_DISPLAYMATRIX)
-                    av_display_rotation_set((int32_t *)sd_dst->data, 0);
-            }
+            AVPacketSideData *sd_dst, *sd_src = &ist->st->codecpar->coded_side_data[i];
+            if (sd_src->type == AV_PKT_DATA_CPB_PROPERTIES)
+                continue;
+            if (ist->apply_cropping && sd_src->type == AV_PKT_DATA_FRAME_CROPPING)
+                continue;
+            sd_dst = av_packet_side_data_new(&ost->par_in->coded_side_data,
+                                             &ost->par_in->nb_coded_side_data,
+                                             sd_src->type, sd_src->size, 0);
+            if (!sd_dst)
+                return AVERROR(ENOMEM);
+            memcpy(sd_dst->data, sd_src->data, sd_src->size);
+            if (ist->autorotate && sd_src->type == AV_PKT_DATA_DISPLAYMATRIX)
+                av_display_rotation_set((int32_t *)sd_dst->data, 0);
         }
     }
 
diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
index b71a84185a..d17b9fc45a 100644
--- a/fftools/ffmpeg_filter.c
+++ b/fftools/ffmpeg_filter.c
@@ -31,6 +31,7 @@
 #include "libavutil/bprint.h"
 #include "libavutil/channel_layout.h"
 #include "libavutil/display.h"
+#include "libavutil/intreadwrite.h"
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/pixfmt.h"
@@ -1381,6 +1382,28 @@ static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
     desc = av_pix_fmt_desc_get(ifp->format);
     av_assert0(desc);
 
+    if (ist->apply_cropping) {
+        AVPacketSideData *sd = av_packet_side_data_get(ist->st->codecpar->coded_side_data,
+                                                       ist->st->codecpar->nb_coded_side_data,
+                                                       AV_PKT_DATA_FRAME_CROPPING);
+
+        if (sd->data && sd->size == sizeof(uint32_t) * 4) {
+            char crop_buf[64];
+            int top    = AV_RL32(sd->data +  0);
+            int bottom = AV_RL32(sd->data +  4);
+            int left   = AV_RL32(sd->data +  8);
+            int right  = AV_RL32(sd->data + 12);
+
+            if (top < 0 || bottom < 0 || left < 0 || right < 0)
+                return AVERROR(EINVAL);
+
+            snprintf(crop_buf, sizeof(crop_buf), "w=iw-%d-%d:h=ih-%d-%d", left, right, top, bottom);
+            ret = insert_filter(&last_filter, &pad_idx, "crop", crop_buf);
+            if (ret < 0)
+                return ret;
+        }
+    }
+
     // TODO: insert hwaccel enabled filters like transpose_vaapi into the graph
     if (ist->autorotate && !(desc->flags & AV_PIX_FMT_FLAG_HWACCEL)) {
         const AVPacketSideData *sd = NULL;
diff --git a/fftools/ffmpeg_opt.c b/fftools/ffmpeg_opt.c
index 304471dd03..1ef131aa3a 100644
--- a/fftools/ffmpeg_opt.c
+++ b/fftools/ffmpeg_opt.c
@@ -1737,6 +1737,9 @@ const OptionDef options[] = {
     { "autorotate",       HAS_ARG | OPT_BOOL | OPT_SPEC |
                           OPT_EXPERT | OPT_INPUT,                                { .off = OFFSET(autorotate) },
         "automatically insert correct rotate filters" },
+    { "apply_cropping",   HAS_ARG | OPT_BOOL | OPT_SPEC |
+                          OPT_EXPERT | OPT_INPUT,                                { .off = OFFSET(apply_cropping) },
+        "Apply frame cropping instead of exporting it" },
     { "autoscale",        HAS_ARG | OPT_BOOL | OPT_SPEC |
                           OPT_EXPERT | OPT_OUTPUT,                               { .off = OFFSET(autoscale) },
         "automatically insert a scale filter at the end of the filter graph" },
-- 
2.42.0

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