avcodec/librav1e: Pass through timestamps as opaque user data

avcodec has no facilities to generate timestamps properly from
output frame numbers (and it would be wrong for VFR anyway),
so pass through the timestamps using rav1e's opaque user data
feature, which was added in v0.4.0.

This bumps the minimum librav1e version to 0.4.0.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

configure

@@ -6408,7 +6408,7 @@ enabled libopus           && {
 }
 enabled libpulse          && require_pkg_config libpulse libpulse pulse/pulseaudio.h pa_context_new
 enabled librabbitmq       && require_pkg_config librabbitmq "librabbitmq >= 0.7.1" amqp.h amqp_new_connection
-enabled librav1e          && require_pkg_config librav1e "rav1e >= 0.1.0" rav1e.h rav1e_context_new
+enabled librav1e          && require_pkg_config librav1e "rav1e >= 0.4.0" rav1e.h rav1e_context_new
 enabled librsvg           && require_pkg_config librsvg librsvg-2.0 librsvg-2.0/librsvg/rsvg.h rsvg_handle_render_cairo
 enabled librtmp           && require_pkg_config librtmp librtmp librtmp/rtmp.h RTMP_Socket
 enabled librubberband     && require_pkg_config librubberband "rubberband >= 1.8.1" rubberband/rubberband-c.h rubberband_new -lstdc++ && append librubberband_extralibs "-lstdc++"

libavcodec/librav1e.c

@@ -445,10 +445,18 @@ static int librav1e_receive_packet(AVCodecContext *avctx, AVPacket *pkt)
         if (frame->buf[0]) {
             const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
 
+            int64_t *pts = av_malloc(sizeof(int64_t));
+            if (!pts) {
+                av_log(avctx, AV_LOG_ERROR, "Could not allocate PTS buffer.\n");
+                return AVERROR(ENOMEM);
+            }
+            *pts = frame->pts;
+
             rframe = rav1e_frame_new(ctx->ctx);
             if (!rframe) {
                 av_log(avctx, AV_LOG_ERROR, "Could not allocate new rav1e frame.\n");
                 av_frame_unref(frame);
+                av_freep(&pts);
                 return AVERROR(ENOMEM);
             }
 
@@ -460,6 +468,7 @@ static int librav1e_receive_packet(AVCodecContext *avctx, AVPacket *pkt)
                                        frame->linesize[i], bytes);
             }
             av_frame_unref(frame);
+            rav1e_frame_set_opaque(rframe, pts, av_free);
         }
     }
 
@@ -535,7 +544,8 @@ retry:
     if (rpkt->frame_type == RA_FRAME_TYPE_KEY)
         pkt->flags |= AV_PKT_FLAG_KEY;
 
-    pkt->pts = pkt->dts = rpkt->input_frameno * avctx->ticks_per_frame;
+    pkt->pts = pkt->dts = *((int64_t *) rpkt->opaque);
+    av_free(rpkt->opaque);
     rav1e_packet_unref(rpkt);
 
     if (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) {