On 8/14/2021 1:55 PM, Paul B Mahol wrote:
+static int smc_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
+ const AVFrame *frame, int *got_packet)
+{
+ SMCContext *s = avctx->priv_data;
+ const AVFrame *pict = frame;
+ uint8_t *pal;
+ int ret;
+
+ ret = ff_alloc_packet(avctx, pkt, 8LL * avctx->height * avctx->width);
+ if (ret < 0)
+ return ret;
+
+ if (avctx->gop_size == 0 || !s->prev_frame->data[0] ||
+ (avctx->frame_number % avctx->gop_size) == 0) {
+ s->key_frame = 1;
+ } else {
+ s->key_frame = 0;
+ }
+
+ bytestream2_init_writer(&s->pb, pkt->data, pkt->size);
+
+ bytestream2_put_be32(&s->pb, 0x00);
+
+ if (!s->prev_frame->data[0]) {
+ s->first_frame = 1;
+ s->prev_frame->format = pict->format;
+ s->prev_frame->width = pict->width;
+ s->prev_frame->height = pict->height;
+ ret = av_frame_get_buffer(s->prev_frame, 0);
This is unnecessary. You're allocating a buffer you'll not use just so
for the next frame the !s->prev_frame->data[0] check above will evaluate
to false.
Get rid of s->first_frame and just look for s->prev_frame->data[0] in
smc_encode_stream() to know if you need to use a previous frame or not.
When you process the second one you'll have called av_frame_ref() on
s->prev_frame at the end of the first, so it will be populated.
+ if (ret < 0)
+ return ret;
+ } else {
+ s->first_frame = 0;
+ }
+
+ pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
+ memcpy(pal, frame->data[1], AVPALETTE_SIZE);
+
+ smc_encode_stream(s, pict);
+
+ av_shrink_packet(pkt, bytestream2_tell_p(&s->pb));
+
+ pkt->data[0] = 0x0;
+
+ // write chunk length
+ AV_WB24(pkt->data + 1, pkt->size);
+
+ av_frame_unref(s->prev_frame);
+ ret = av_frame_ref(s->prev_frame, frame);
+ if (ret < 0) {
+ av_log(avctx, AV_LOG_ERROR, "cannot add reference\n");
+ return ret;
+ }
+
+ if (s->key_frame)
+ pkt->flags |= AV_PKT_FLAG_KEY;
+
+ *got_packet = 1;
+
+ return 0;
+}
+
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