[FFmpeg-devel] [PATCH 1/2 v2] fftools/ffmpeg: support applying container level cropping

[James Almer <jamrial@gmail.com>]

Signed-off-by: James Almer <jamrial@gmail.com>
---
 fftools/ffmpeg.h        |  7 +++++++
 fftools/ffmpeg_demux.c  | 16 ++++++++++++++++
 fftools/ffmpeg_filter.c | 10 ++++++++++
 fftools/ffmpeg_opt.c    |  3 +++
 4 files changed, 36 insertions(+)

diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h
index fe75706afd..f908e16549 100644
--- a/fftools/ffmpeg.h
+++ b/fftools/ffmpeg.h
@@ -155,6 +155,7 @@ typedef struct OptionsContext {
     SpecifierOptList hwaccel_devices;
     SpecifierOptList hwaccel_output_formats;
     SpecifierOptList autorotate;
+    SpecifierOptList apply_cropping;
 
     /* output options */
     StreamMap *stream_maps;
@@ -239,6 +240,7 @@ enum IFilterFlags {
     IFILTER_FLAG_AUTOROTATE     = (1 << 0),
     IFILTER_FLAG_REINIT         = (1 << 1),
     IFILTER_FLAG_CFR            = (1 << 2),
+    IFILTER_FLAG_CROP           = (1 << 3),
 };
 
 typedef struct InputFilterOptions {
@@ -254,6 +256,11 @@ typedef struct InputFilterOptions {
      * accurate */
     AVRational          framerate;
 
+    unsigned crop_top;
+    unsigned crop_bottom;
+    unsigned crop_left;
+    unsigned crop_right;
+
     int                 sub2video_width;
     int                 sub2video_height;
 
diff --git a/fftools/ffmpeg_demux.c b/fftools/ffmpeg_demux.c
index 1ca8d804ae..011b56709f 100644
--- a/fftools/ffmpeg_demux.c
+++ b/fftools/ffmpeg_demux.c
@@ -66,6 +66,7 @@ typedef struct DemuxStream {
     int                      have_sub2video;
     int                      reinit_filters;
     int                      autorotate;
+    int                      apply_cropping;
 
 
     int                      wrap_correction_done;
@@ -1000,11 +1001,21 @@ int ist_filter_add(InputStream *ist, InputFilter *ifilter, int is_simple,
     ist->filters[ist->nb_filters - 1] = ifilter;
 
     if (ist->par->codec_type == AVMEDIA_TYPE_VIDEO) {
+        const AVPacketSideData *sd = av_packet_side_data_get(ist->par->coded_side_data,
+                                                             ist->par->nb_coded_side_data,
+                                                             AV_PKT_DATA_FRAME_CROPPING);
         if (ist->framerate.num > 0 && ist->framerate.den > 0) {
             opts->framerate = ist->framerate;
             opts->flags |= IFILTER_FLAG_CFR;
         } else
             opts->framerate = av_guess_frame_rate(d->f.ctx, ist->st, NULL);
+        if (sd && sd->size == sizeof(uint32_t) * 4) {
+            opts->crop_top    = AV_RL32(sd->data +  0);
+            opts->crop_bottom = AV_RL32(sd->data +  4);
+            opts->crop_left   = AV_RL32(sd->data +  8);
+            opts->crop_right  = AV_RL32(sd->data + 12);
+            opts->flags      |= IFILTER_FLAG_CROP;
+        }
     } else if (ist->par->codec_type == AVMEDIA_TYPE_SUBTITLE) {
         /* Compute the size of the canvas for the subtitles stream.
            If the subtitles codecpar has set a size, use it. Otherwise use the
@@ -1241,6 +1252,9 @@ static int ist_add(const OptionsContext *o, Demuxer *d, AVStream *st)
     ds->autorotate = 1;
     MATCH_PER_STREAM_OPT(autorotate, i, ds->autorotate, ic, st);
 
+    ds->apply_cropping = 1;
+    MATCH_PER_STREAM_OPT(apply_cropping, i, ds->apply_cropping, ic, st);
+
     MATCH_PER_STREAM_OPT(codec_tags, str, codec_tag, ic, st);
     if (codec_tag) {
         uint32_t tag = strtol(codec_tag, &next, 0);
@@ -1362,6 +1376,8 @@ static int ist_add(const OptionsContext *o, Demuxer *d, AVStream *st)
 
     ds->dec_opts.flags |= DECODER_FLAG_BITEXACT * !!o->bitexact;
 
+    av_dict_set_int(&ds->decoder_opts, "apply_cropping", ds->apply_cropping, 0);
+
     /* Attached pics are sparse, therefore we would not want to delay their decoding
      * till EOF. */
     if (ist->st->disposition & AV_DISPOSITION_ATTACHED_PIC)
diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
index 12cca684b4..f3087afc88 100644
--- a/fftools/ffmpeg_filter.c
+++ b/fftools/ffmpeg_filter.c
@@ -1701,6 +1701,16 @@ static int configure_input_video_filter(FilterGraph *fg, AVFilterGraph *graph,
     desc = av_pix_fmt_desc_get(ifp->format);
     av_assert0(desc);
 
+    if ((ifp->opts.flags & IFILTER_FLAG_CROP)) {
+        char crop_buf[64];
+        snprintf(crop_buf, sizeof(crop_buf), "w=iw-%d-%d:h=ih-%d-%d",
+                 ifp->opts.crop_left, ifp->opts.crop_right,
+                 ifp->opts.crop_top, ifp->opts.crop_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
     ifp->displaymatrix_applied = 0;
     if ((ifp->opts.flags & IFILTER_FLAG_AUTOROTATE) &&
diff --git a/fftools/ffmpeg_opt.c b/fftools/ffmpeg_opt.c
index 910e4a336b..0c50ce16ba 100644
--- a/fftools/ffmpeg_opt.c
+++ b/fftools/ffmpeg_opt.c
@@ -1732,6 +1732,9 @@ const OptionDef options[] = {
     { "autoscale",                  OPT_TYPE_BOOL,   OPT_PERSTREAM | OPT_EXPERT | OPT_OUTPUT,
         { .off = OFFSET(autoscale) },
         "automatically insert a scale filter at the end of the filter graph" },
+    { "apply_cropping",             OPT_TYPE_BOOL,   OPT_PERSTREAM | OPT_EXPERT | OPT_INPUT,
+        { .off = OFFSET(apply_cropping) },
+        "apply frame cropping" },
     { "fix_sub_duration_heartbeat", OPT_TYPE_BOOL,   OPT_VIDEO | OPT_EXPERT | OPT_PERSTREAM | OPT_OUTPUT,
         { .off = OFFSET(fix_sub_duration_heartbeat) },
         "set this video output stream to be a heartbeat stream for "
-- 
2.45.1

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