+ // STOP_TIMER("update_duplicate_context")
+ // about 10k cycles / 0.01 sec for 1000frames on 1ghz with 2 threads
+}
+
+int ff_mpeg_update_thread_context(AVCodecContext *dst,
+ const AVCodecContext *src)
+{
+ MpegEncContext *s = dst->priv_data, *s1 = src->priv_data;
+
+ if (dst == src || !s1->context_initialized)
+ return 0;
+
+ // FIXME can parameters change on I-frames?
+ // in that case dst may need a reinit
+ if (!s->context_initialized) {
+ memcpy(s, s1, sizeof(MpegEncContext));
+
+ s->avctx = dst;
+ s->picture_range_start += MAX_PICTURE_COUNT;
+ s->picture_range_end += MAX_PICTURE_COUNT;
+ s->bitstream_buffer = NULL;
+ s->bitstream_buffer_size = s->allocated_bitstream_buffer_size = 0;
+
+ ff_MPV_common_init(s);
+ }
+
+ s->avctx->coded_height = s1->avctx->coded_height;
+ s->avctx->coded_width = s1->avctx->coded_width;
+ s->avctx->width = s1->avctx->width;
+ s->avctx->height = s1->avctx->height;
+
+ s->coded_picture_number = s1->coded_picture_number;
+ s->picture_number = s1->picture_number;
+ s->input_picture_number = s1->input_picture_number;
+
+ memcpy(s->picture, s1->picture, s1->picture_count * sizeof(Picture));
+ memcpy(&s->last_picture, &s1->last_picture,
+ (char *) &s1->last_picture_ptr - (char *) &s1->last_picture);
+
+ s->last_picture_ptr = REBASE_PICTURE(s1->last_picture_ptr, s, s1);
+ s->current_picture_ptr = REBASE_PICTURE(s1->current_picture_ptr, s, s1);
+ s->next_picture_ptr = REBASE_PICTURE(s1->next_picture_ptr, s, s1);
+
+ // Error/bug resilience
+ s->next_p_frame_damaged = s1->next_p_frame_damaged;
+ s->workaround_bugs = s1->workaround_bugs;
+
+ // MPEG4 timing info
+ memcpy(&s->time_increment_bits, &s1->time_increment_bits,
+ (char *) &s1->shape - (char *) &s1->time_increment_bits);
+
+ // B-frame info
+ s->max_b_frames = s1->max_b_frames;
+ s->low_delay = s1->low_delay;
+ s->dropable = s1->dropable;
+
+ // DivX handling (doesn't work)
+ s->divx_packed = s1->divx_packed;
+
+ if (s1->bitstream_buffer) {
+ if (s1->bitstream_buffer_size +
+ FF_INPUT_BUFFER_PADDING_SIZE > s->allocated_bitstream_buffer_size)
+ av_fast_malloc(&s->bitstream_buffer,
+ &s->allocated_bitstream_buffer_size,
+ s1->allocated_bitstream_buffer_size);
+ s->bitstream_buffer_size = s1->bitstream_buffer_size;
+ memcpy(s->bitstream_buffer, s1->bitstream_buffer,
+ s1->bitstream_buffer_size);
+ memset(s->bitstream_buffer + s->bitstream_buffer_size, 0,
+ FF_INPUT_BUFFER_PADDING_SIZE);
+ }
+
+ // MPEG2/interlacing info
+ memcpy(&s->progressive_sequence, &s1->progressive_sequence,
+ (char *) &s1->rtp_mode - (char *) &s1->progressive_sequence);
+
+ if (!s1->first_field) {
+ s->last_pict_type = s1->pict_type;
+ if (s1->current_picture_ptr)
+ s->last_lambda_for[s1->pict_type] = s1->current_picture_ptr->f.quality;
+
+ if (s1->pict_type != AV_PICTURE_TYPE_B) {
+ s->last_non_b_pict_type = s1->pict_type;
+ }
+ }
+
+ return 0;