-static int cbs_h2645_write_nal_unit(CodedBitstreamContext *ctx,
- CodedBitstreamUnit *unit)
-{
- CodedBitstreamH2645Context *priv = ctx->priv_data;
- enum AVCodecID codec_id = ctx->codec->codec_id;
- PutBitContext pbc;
- int err;
-
- if (!priv->write_buffer) {
- // Initial write buffer size is 1MB.
- priv->write_buffer_size = 1024 * 1024;
-
- reallocate_and_try_again:
- err = av_reallocp(&priv->write_buffer, priv->write_buffer_size);
- if (err < 0) {
- av_log(ctx->log_ctx, AV_LOG_ERROR, "Unable to allocate a "
- "sufficiently large write buffer (last attempt "
- "%"SIZE_SPECIFIER" bytes).\n", priv->write_buffer_size);
- return err;
- }
- }
-
- init_put_bits(&pbc, priv->write_buffer, priv->write_buffer_size);
-
- if (codec_id == AV_CODEC_ID_H264)
- err = cbs_h264_write_nal_unit(ctx, unit, &pbc);
- else
- err = cbs_h265_write_nal_unit(ctx, unit, &pbc);
-
- if (err == AVERROR(ENOSPC)) {
- // Overflow.
- priv->write_buffer_size *= 2;
- goto reallocate_and_try_again;
- }
- // Overflow but we didn't notice.
- av_assert0(put_bits_count(&pbc) <= 8 * priv->write_buffer_size);
-
- if (err < 0) {
- // Write failed for some other reason.
- return err;
- }
-
- if (put_bits_count(&pbc) % 8)
- unit->data_bit_padding = 8 - put_bits_count(&pbc) % 8;
- else
- unit->data_bit_padding = 0;
-
- unit->data_size = (put_bits_count(&pbc) + 7) / 8;
- flush_put_bits(&pbc);
-
- err = ff_cbs_alloc_unit_data(ctx, unit, unit->data_size);
- if (err < 0)
- return err;
-
- memcpy(unit->data, priv->write_buffer, unit->data_size);
-
- return 0;
-}
-