[FFmpeg-devel] [PATCH] avcodec/libvpxenc: add ROI-based encoding support for VP8/VP9 support
Guo, Yejun
yejun.guo at intel.com
Mon Aug 12 09:40:02 EEST 2019
example command line to verify it:
./ffmpeg -i input.stream -vf addroi=0:0:iw/3:ih/3:-0.8 -c:v libvpx -b:v 2M tmp.webm
Signed-off-by: Guo, Yejun <yejun.guo at intel.com>
---
libavcodec/libvpxenc.c | 177 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 177 insertions(+)
diff --git a/libavcodec/libvpxenc.c b/libavcodec/libvpxenc.c
index 1a85bc6..09caf9e 100644
--- a/libavcodec/libvpxenc.c
+++ b/libavcodec/libvpxenc.c
@@ -116,6 +116,9 @@ typedef struct VPxEncoderContext {
int tune_content;
int corpus_complexity;
int tpl_model;
+ // If the driver does not support ROI then warn the first time we
+ // encounter a frame with ROI side data.
+ int roi_warned;
} VPxContext;
/** String mappings for enum vp8e_enc_control_id */
@@ -1057,6 +1060,172 @@ static int queue_frames(AVCodecContext *avctx, AVPacket *pkt_out)
return size;
}
+static int set_roi_map(AVCodecContext *avctx, const AVFrameSideData *sd, int frame_width, int frame_height,
+ vpx_roi_map_t *roi_map, int block_size, int segment_cnt)
+{
+ /* range of vpx_roi_map_t.delta_q[i] is [-63, 63] */
+#define MAX_DELTA_Q 63
+
+ const AVRegionOfInterest *roi = NULL;
+ int nb_rois;
+ uint32_t self_size;
+ int segment_id;
+
+ /* record the mapping from delta_q to "segment id + 1" in segment_mapping[].
+ * the range of delta_q is [-MAX_DELTA_Q, MAX_DELTA_Q],
+ * and its corresponding array index is [0, 2 * MAX_DELTA_Q],
+ * and so the length of the mapping array is 2 * MAX_DELTA_Q + 1.
+ * "segment id + 1", so we can say there's no mapping if the value of array element is zero.
+ */
+ int segment_mapping[2 * MAX_DELTA_Q + 1] = { 0 };
+
+ memset(roi_map, 0, sizeof(*roi_map));
+
+ /* segment id 0 in roi_map is reserved for the areas not covered by AVRegionOfInterest.
+ * segment id 0 in roi_map is also for the areas with AVRegionOfInterest.qoffset near 0.
+ * (delta_q of segment id 0 is 0).
+ */
+ segment_mapping[MAX_DELTA_Q] = 1;
+ /* roi_map has memset with zero, just explictly set it again for explict understanding. */
+ roi_map->delta_q[0] = 0;
+ segment_id = 1;
+
+ roi = (const AVRegionOfInterest*)sd->data;
+ self_size = roi->self_size;
+ if (!self_size || sd->size % self_size != 0) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid AVRegionOfInterest.self_size.\n");
+ return AVERROR(EINVAL);
+ }
+ nb_rois = sd->size / self_size;
+
+ /* This list must be iterated from zero because regions are
+ * defined in order of decreasing importance. So discard less
+ * important areas if they exceed the segment count.
+ */
+ for (int i = 0; i < nb_rois; i++) {
+ int delta_q;
+ int mapping_index;
+
+ roi = (const AVRegionOfInterest*)(sd->data + self_size * i);
+ if (roi->qoffset.den == 0) {
+ av_log(avctx, AV_LOG_ERROR, "AVRegionOfInterest.qoffset.den must not be zero.\n");
+ return AVERROR(EINVAL);
+ }
+
+ delta_q = (int)(roi->qoffset.num * 1.0f / roi->qoffset.den * MAX_DELTA_Q);
+ delta_q = av_clip(delta_q, -MAX_DELTA_Q, MAX_DELTA_Q);
+
+ mapping_index = delta_q + MAX_DELTA_Q;
+ if (!segment_mapping[mapping_index]) {
+ if (segment_id == segment_cnt) {
+ av_log(avctx, AV_LOG_WARNING,
+ "ROI only supports %d segments (and segment 0 is reserved for non-ROIs), skipping the left ones.\n",
+ segment_cnt);
+ break;
+ }
+
+ segment_mapping[mapping_index] = segment_id + 1;
+ roi_map->delta_q[segment_id] = delta_q;
+ segment_id++;
+ }
+ }
+
+
+ roi_map->rows = (frame_height + block_size - 1) / block_size;
+ roi_map->cols = (frame_width + block_size - 1) / block_size;
+ roi_map->roi_map = av_mallocz_array(roi_map->rows * roi_map->cols, sizeof(*roi_map->roi_map));
+ if (!roi_map->roi_map) {
+ av_log(avctx, AV_LOG_ERROR, "roi_map alloc failed.\n");
+ return AVERROR(ENOMEM);
+ }
+
+ /* This list must be iterated in reverse, so for the case that
+ * two regions overlapping, the more important area takes effect.
+ */
+ for (int i = nb_rois - 1; i >= 0; i--) {
+ int delta_q;
+ int mapping_value;
+ int starty, endy, startx, endx;
+
+ roi = (const AVRegionOfInterest*)(sd->data + self_size * i);
+
+ starty = av_clip(roi->top / block_size, 0, roi_map->rows);
+ endy = av_clip((roi->bottom + block_size - 1) / block_size, 0, roi_map->rows);
+ startx = av_clip(roi->left / block_size, 0, roi_map->cols);
+ endx = av_clip((roi->right + block_size - 1) / block_size, 0, roi_map->cols);
+
+ delta_q = (int)(roi->qoffset.num * 1.0f / roi->qoffset.den * MAX_DELTA_Q);
+ delta_q = av_clip(delta_q, -MAX_DELTA_Q, MAX_DELTA_Q);
+
+ mapping_value = segment_mapping[delta_q + MAX_DELTA_Q];
+ if (mapping_value) {
+ for (int y = starty; y < endy; y++)
+ for (int x = startx; x < endx; x++)
+ roi_map->roi_map[x + y * roi_map->cols] = mapping_value - 1;
+ }
+ }
+
+ return 0;
+}
+
+static int vp9_encode_set_roi(AVCodecContext *avctx, int frame_width, int frame_height, const AVFrameSideData *sd)
+{
+ vpx_roi_map_t roi_map;
+ int segment_cnt = 8;
+ int block_size = 8;
+ VPxContext *ctx = avctx->priv_data;
+ int ret;
+
+ if (ctx->aq_mode > 0 || ctx->cpu_used < 5 || ctx->deadline != VPX_DL_REALTIME) {
+ if (!ctx->roi_warned) {
+ ctx->roi_warned = 1;
+ if (ctx->aq_mode > 0)
+ av_log(avctx, AV_LOG_WARNING, "ROI is disabled when any of AQ mode is on, skipping ROI.\n");
+ else
+ av_log(avctx, AV_LOG_WARNING, "due to libvpx's internal issue (see function apply_roi_map), skipping ROI.\n");
+ return AVERROR(EINVAL);
+ }
+ }
+
+ ret = set_roi_map(avctx, sd, frame_width, frame_height, &roi_map, block_size, segment_cnt);
+ if (ret) {
+ log_encoder_error(avctx, "Failed to set_roi_map.\n");
+ return ret;
+ }
+
+ memset(roi_map.ref_frame, -1, sizeof(roi_map.ref_frame));
+
+ if (vpx_codec_control(&ctx->encoder, VP9E_SET_ROI_MAP, &roi_map)) {
+ log_encoder_error(avctx, "Failed to set VP9E_SET_ROI_MAP codec control.\n");
+ ret = AVERROR_INVALIDDATA;
+ }
+
+ av_freep(&roi_map.roi_map);
+ return ret;
+}
+
+static int vp8_encode_set_roi(AVCodecContext *avctx, int frame_width, int frame_height, const AVFrameSideData *sd)
+{
+ vpx_roi_map_t roi_map;
+ int segment_cnt = 4;
+ int block_size = 16;
+ VPxContext *ctx = avctx->priv_data;
+
+ int ret = set_roi_map(avctx, sd, frame_width, frame_height, &roi_map, block_size, segment_cnt);
+ if (ret) {
+ log_encoder_error(avctx, "Failed to set_roi_map.\n");
+ return ret;
+ }
+
+ if (vpx_codec_control(&ctx->encoder, VP8E_SET_ROI_MAP, &roi_map)) {
+ log_encoder_error(avctx, "Failed to set VP8E_SET_ROI_MAP codec control.\n");
+ ret = AVERROR_INVALIDDATA;
+ }
+
+ av_freep(&roi_map.roi_map);
+ return ret;
+}
+
static int vpx_encode(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *frame, int *got_packet)
{
@@ -1068,6 +1237,7 @@ static int vpx_encode(AVCodecContext *avctx, AVPacket *pkt,
vpx_enc_frame_flags_t flags = 0;
if (frame) {
+ const AVFrameSideData *sd = av_frame_get_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST);
rawimg = &ctx->rawimg;
rawimg->planes[VPX_PLANE_Y] = frame->data[0];
rawimg->planes[VPX_PLANE_U] = frame->data[1];
@@ -1113,6 +1283,13 @@ static int vpx_encode(AVCodecContext *avctx, AVPacket *pkt,
flags |= strtoul(en->value, NULL, 10);
}
}
+
+ if (sd) {
+ if (avctx->codec_id == AV_CODEC_ID_VP8)
+ vp8_encode_set_roi(avctx, frame->width, frame->height, sd);
+ else if (avctx->codec_id == AV_CODEC_ID_VP9)
+ vp9_encode_set_roi(avctx, frame->width, frame->height, sd);
+ }
}
res = vpx_codec_encode(&ctx->encoder, rawimg, timestamp,
--
2.7.4
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